WO2011062198A1 - 分散組成物及び感光性樹脂組成物、並びに固体撮像素子 - Google Patents
分散組成物及び感光性樹脂組成物、並びに固体撮像素子 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
- C09K23/002—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
- C09K23/34—Higher-molecular-weight carboxylic acid esters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0005—Production of optical devices or components in so far as characterised by the lithographic processes or materials used therefor
- G03F7/0007—Filters, e.g. additive colour filters; Components for display devices
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
- G03F7/031—Organic compounds not covered by group G03F7/029
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
- G03F7/033—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
Definitions
- the present invention relates to a dispersion composition, a photosensitive resin composition, and a solid-state imaging device.
- Photosensitive resin that has a high refractive index and can form fine patterns for use as an optical wiring alternative to microlenses and copper wiring used in on-chip color filter imaging optical systems such as electronic copying machines and solid-state image sensors.
- a composition is desired.
- microlenses used in solid-state imaging devices are required to be finer as solid-state imaging devices become more miniaturized, and higher refractive index is required to achieve more efficient light collection. It has become.
- a photosensitive resin composition for forming a microlens that can form a pattern with the same negative type as the color filter forming method is desired.
- a high refractive index pattern-forming photopolymerizable composition using silica-coated titanium oxide particles has been disclosed (see, for example, JP-A-2009-179678). Further, a composition for a solid-state imaging device using a metal oxide in which the proportion of silicon atoms on the particle surface is 20% or more is disclosed, and it is shown that the pattern forming property is excellent at a high refractive index (for example, (See Kaikai 2008-185683).
- the present invention has been made in view of the above, a dispersion composition having a high refractive index and a high transmittance, and a photosensitive resin composition capable of forming a pattern having a high resolution and a high transmittance with high resolution. It is another object of the present invention to provide a solid-state imaging device configured using the photosensitive resin composition.
- graft chain in the graft copolymer (B) is at least one selected from the group consisting of a polyester structure, a polyether structure, and a poly (meth) acrylic structure. object.
- the graft copolymer (B) is a graft copolymer containing at least a structural unit represented by any of the following formulas (1) to (5):
- X 1 , X 2 , X 3 , X 4 , X 5 , and X 6 each independently represent a hydrogen atom or a monovalent organic group
- Y 1 , Y 2 , Y 3 , Y 4 , and Y 5 each independently represent a divalent linking group
- Z 1 , Z 2 , Z 3 , Z 4 , and Z 5 each independently represent a hydrogen atom or 1 R represents a hydrogen atom or a monovalent organic group, and a plurality of R having different structures may be present in the copolymer
- n, m, p, q, and r Each independently represents an integer of 1 to 500
- j and k each independently represents an integer of 2 to 8.
- the graft copolymer (B) contains 10% of the structural unit represented by any one of the formulas (1) to (5) in terms of mass with respect to the total mass of the graft copolymer.
- the dispersion composition according to the above ⁇ 3> which is a graft copolymer contained in an amount of ⁇ 90%.
- graft copolymer (B) is a graft copolymer further having at least one selected from a carboxylic acid group, a sulfonic acid group, and a phosphoric acid group
- a photosensitive resin composition comprising the dispersion composition according to any one of ⁇ 1> to ⁇ 6>, a polymerizable compound (D), and a polymerization initiator (E).
- the photosensitive resin composition according to ⁇ 7> further including a binder polymer.
- R 1 and R 2 are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms; R 1 and R 2 May be the same as or different from each other, but do not represent a hydrogen atom at the same time, and R 1 and R 2 may form a cyclic amino group together with the nitrogen atom; R 3 and R 4 are each independently an electron Represents a suction group.
- a solid-state imaging device comprising a transparent pattern formed using the photosensitive resin composition according to any one of ⁇ 7> to ⁇ 11>.
- the dispersion composition in the present invention contains, as a dispersant, a graft copolymer (B) having a graft chain in which the number of atoms excluding hydrogen atoms is in the range of 40 to 10,000.
- a graft copolymer (B) having a graft chain in which the number of atoms excluding hydrogen atoms is in the range of 40 to 10,000 By functioning as a group, the titanium dioxide particles can be uniformly dispersed with good dispersibility. Moreover, even when the dispersion composition of the present invention is stored at room temperature for a long period of time, the precipitation of titanium dioxide particles can be suppressed for a long period of time by the interaction between the graft chain and the solvent.
- the graft chain functions as a steric repulsion group to prevent aggregation of titanium dioxide particles, so that the titanium dioxide content can be increased. As a result, a high refractive index is obtained.
- the photosensitive resin composition is composed of a graft copolymer containing a structural unit represented by any one of formulas (1) to (5), which is a preferred embodiment of the present invention
- the graft chain The hydrophilicity of is further improved.
- the developability of the graft copolymer is further improved, and it is presumed that both excellent dispersibility and reduction in residue during development have been achieved.
- the photosensitive resin composition containing the dispersion composition of this invention obtained using the said graft copolymer is apply
- a dispersion composition having a high refractive index and a high transmittance, a photosensitive resin composition capable of forming a pattern having high resolution and a high refractive index and a high transmittance, and the photosensitive resin A solid-state imaging device configured using the composition can be provided.
- the dispersion composition of the present invention comprises at least one kind of titanium dioxide particles (A) having an average primary particle diameter of 1 nm to 100 nm and graft chains having a number of atoms excluding hydrogen atoms in the range of 40 to 10,000. And at least one graft copolymer (B) having a solvent (C). With this configuration, a dispersion composition having a high refractive index and a high transmittance can be formed. Furthermore, the dispersion composition of the present invention has high dispersibility of the titanium dioxide particles, and further suppresses sedimentation of the titanium dioxide particles and is excellent in storage stability.
- titanium dioxide particles used in the present invention have an average primary particle size (hereinafter sometimes simply referred to as “primary particle size”). If it is 1 nm to 100 nm, there will be no restriction
- the primary particle diameter of the titanium dioxide particles is from 1 nm to 100 nm, preferably from 1 nm to 80 nm, and particularly preferably from 1 nm to 50 nm. If the primary particle diameter of the titanium dioxide particles exceeds 100 nm, the refractive index and transmittance may be lowered.
- the average primary particle diameter of the titanium dioxide particles can be obtained from a photograph obtained by observing the dispersed titanium dioxide particles with a transmission electron microscope. Specifically, the projected area of the titanium dioxide particles is obtained, and the average of equivalent circle diameters corresponding thereto is taken as the average primary particle diameter of the titanium dioxide particles.
- the primary particle diameter in this invention be the arithmetic mean value of the circle equivalent diameter calculated
- the average particle size can also be used as an index of the primary particle size.
- a mixed liquid or dispersion containing titanium dioxide is diluted 80 times with propylene glycol monomethyl ether acetate, and the obtained diluted liquid is subjected to a dynamic light scattering method.
- the refractive index of the titanium dioxide particles is not particularly limited, but is preferably 1.70 to 2.70, and preferably 1.90 to 2.70 from the viewpoint of obtaining a high refractive index. Further preferred.
- the specific surface area of the titanium dioxide fine particles is preferably 10 m 2 / g to 400 m 2 / g, more preferably 20 m 2 / g to 200 m 2 / g, and 30 m 2 / g to 150 m 2 / g. Most preferably it is.
- the titanium dioxide particles can be, for example, a rice grain shape, a spherical shape, a cubic shape, a spindle shape, or an indefinite shape.
- the titanium dioxide particles in the present invention may have been surface-treated with an organic compound.
- organic compounds used for the surface treatment include polyols, alkanolamines, stearic acid, silane coupling agents, and titanate coupling agents. Of these, silane coupling agents are preferred.
- the surface treatment may be carried out by using a single surface treatment agent or a combination of two or more surface treatment agents. It is also preferable that the surface of the titanium dioxide particles is covered with an oxide such as aluminum, silicon, or zirconia. Thereby, a weather resistance improves more.
- titanium dioxide in this invention what is marketed can be used preferably. Specifically, for example, TTO series (TTO-51 (A), TTO-51 (C), TTO-55 (C), etc.), TTO-S, V series (TTO-S-1, TTO-S-) 2, TTO-V-3, etc.) (above, trade names, manufactured by Ishihara Sangyo Co., Ltd.), MT series (MT-01, MT-05, etc.) (trade names, manufactured by Teika), etc. it can.
- the titanium dioxide may be used alone or in combination of two or more.
- the content of titanium dioxide in the dispersion composition of the present invention is preferably 15% by mass to 50% by mass, more preferably 15% by mass to 40% by mass with respect to the entire dispersion composition. %, Particularly preferably 20% by mass to 40% by mass. Further, when the photosensitive resin composition of the present invention is constituted, the titanium dioxide content in the photosensitive resin composition is from 0.5% by mass to 90% by mass, more preferably 1% by mass with respect to the entire photosensitive composition. % To 80% by weight, most preferably 2% to 70% by weight.
- inorganic particles other than titanium dioxide may be used in combination.
- examples of inorganic particles that can be used in combination include ZrO 2 particles and SiO 2 particles.
- the dispersion composition of the present invention contains at least one graft copolymer (hereinafter also referred to as “specific resin”).
- the graft copolymer of the present invention has at least one graft chain in which the number of atoms excluding hydrogen atoms is in the range of 40 to 10,000.
- the graft chain in this case means from the base of the main chain of the copolymer to the end of the group branched from the main chain.
- the specific resin is a dispersion resin that imparts dispersibility to the titanium dioxide particles, and has excellent dispersibility and affinity with the solvent due to the graft chain. Excellent dispersion stability after aging.
- a graft chain has affinity with a polymerizable compound or other resins that can be used in combination, a residue is hardly generated by alkali development.
- the dispersion resin itself essential for the dispersion of the titanium dioxide particles is an alkali.
- a photosensitive resin composition is preferable because it is excellent in pattern formability in the exposed area and the alkali developability in the unexposed area is improved.
- the graft copolymer (B) used in the present invention has 40 to 10,000 atoms excluding hydrogen atoms per graft chain, but the number of atoms excluding hydrogen atoms per graft chain. Is more preferably from 50 to 2000, and even more preferably from 60 to 500, excluding hydrogen atoms per graft chain. If the number of atoms excluding hydrogen atoms per graft chain is less than 40, the graft chain is short, so that the steric repulsion effect is reduced and the dispersibility may be lowered.
- the number of atoms excluding hydrogen atoms per graft chain includes from the base atom bonded to the polymer chain constituting the main chain to the end of the branched polymer branched from the main chain.
- a poly (meth) acrylic structure, a polyester structure, a polyurethane structure, a polyurea structure, a polyamide structure, a polyether structure, etc. can be used, but the interaction between the graft chain and the solvent is improved.
- a graft chain having a poly (meth) acrylic structure, a polyester structure, or a polyether structure is preferable, and a polyester structure or a polyether structure is more preferable.
- the structure of the macromonomer having such a polymer structure as a graft chain is not particularly limited as long as it has a substituent capable of reacting with the polymer main chain portion and satisfies the requirements of the present invention.
- a macromonomer having a reactive double bond group can be preferably used.
- AA-6, AA-10, AB-6, AS-6, AN-6, Bremer PME-4000 and the like are preferable.
- the graft chain in the specific resin used in the present invention preferably contains at least one structural unit represented by any one of the following formulas (1) to (5).
- a graft copolymer containing a structural unit represented by any one of formulas (1) to (5) which is a preferred embodiment of the present invention, is used in a photosensitive resin composition
- the graft chain The hydrophilicity of is further improved.
- the developability of the graft copolymer is further improved, and both excellent dispersibility and reduction of residues in development can be achieved at a high level.
- X 1 , X 2 , X 3 , X 4 , X 5 , and X 6 each independently represent a hydrogen atom or a monovalent organic group. From the viewpoint of synthesis constraints, a hydrogen atom or an alkyl group having 1 to 12 carbon atoms is preferable, a hydrogen atom or a methyl group is more preferable, and a methyl group is particularly preferable.
- Y 1 , Y 2 , Y 3 , Y 4 , and Y 5 are each independently a divalent linking group and are not particularly limited in structure. Specific examples include the following linking groups (Y-1) to (Y-20).
- A means a bond with the left terminal group of Y 1 , Y 2 , Y 3 , Y 4 , or Y 5 in formulas (1) to (5)
- B represents the formula (1) Means a bond with the right terminal group of Y 1 , Y 2 , Y 3 , Y 4 , or Y 5 in Formula (5).
- (Y-2) and (Y-13) are more preferred because of the ease of synthesis.
- Z 1 , Z 2 , Z 3 , Z 4 , and Z 5 are each independently a hydrogen atom or a monovalent organic group, and the monovalent substituent is
- the structure is not particularly limited, and specific examples include an alkyl group, a hydroxyl group, an alkoxy group, an aryloxy group, a heteroaryloxy group, an alkylthioether group, an arylthioether group, a heteroarylthioether group, and an amino group. .
- n, m, p, q, and r are each an integer of 1 to 500, preferably an integer of 3 to 100, and more preferably 5 to An integer of 50.
- j and k each independently represent an integer of 2 to 8.
- J and k in formula (1) and formula (2) are each independently preferably an integer of 4 to 6 and most preferably 5 from the viewpoints of dispersion stability and developability.
- R represents a hydrogen atom or a monovalent organic group and is not particularly limited in terms of structure, but is preferably a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group, more preferably a hydrogen atom.
- the alkyl group is preferably a linear alkyl group having 1 to 20 carbon atoms, a branched alkyl group having 3 to 20 carbon atoms, or a cyclic alkyl group having 5 to 20 carbon atoms.
- a linear alkyl group having 1 to 20 carbon atoms is more preferable, and a linear alkyl group having 1 to 6 carbon atoms is particularly preferable.
- two or more types of R having different structures may be contained in the specific resin.
- the structural unit represented by the formula (1) is more preferably a structural unit represented by the following formula (1A) from the viewpoint of dispersion stability and developability.
- the structural unit represented by the formula (2) is more preferably a structural unit represented by the following formula (2A) from the viewpoint of dispersion stability and developability.
- X 1, Y 1, Z 1 and n are as defined X 1, Y 1, Z 1 and n in Formula (1), and preferred ranges are also the same.
- X 2, Y 2, Z 2 and m are as defined X 2, Y 2, Z 2 and m in the formula (2), and preferred ranges are also the same.
- the amount of the structural unit represented by any one of the formulas (1) to (5) in the specific resin used in the present invention is preferably in the range of 10% to 90%, more preferably in the range of 30% to 70%, based on the total mass of the specific resin. . Within this range, the dispersibility of the titanium dioxide particles is high, and the developability when using a photosensitive resin composition is further improved.
- the specific resin used in the present invention may be a combination of two or more graft copolymers having different structures.
- R represents a hydrogen atom or a monovalent organic group and is not particularly limited in terms of structure, but is preferably a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group, more preferably It is a hydrogen atom or an alkyl group.
- two or more types of R having different structures may be present in the specific resin.
- the plurality of R may be the same or different, or the structural unit represented by the formula (5) in the specific resin May be the same or different.
- the specific resin in the present invention further includes a structural unit having a functional group capable of interacting with titanium dioxide in addition to the graft chain and having a functional group capable of interacting with titanium dioxide.
- the structural unit having a functional group capable of interacting with titanium dioxide is not particularly limited in terms of structure, for example, a structural unit having an acid group, a structural unit having a basic group, a structural unit having a coordinating group, Examples thereof include structural units having reactivity.
- the acid group examples include a carboxylic acid group, a sulfonic acid group, a phosphoric acid group, a phenolic hydroxyl group, and the like, and from the viewpoints of adsorption power and dispersibility to titanium dioxide, a carboxylic acid group, a sulfonic acid group, and It is preferably at least one selected from phosphoric acid groups, and carboxylic acid groups are particularly preferable.
- these can be used individually by 1 type or in combination of 2 or more types. Further, by introducing such an acid group, there is an advantage that the alkali developability of the specific resin is further improved.
- the content of the copolymer component that forms the structural unit having an acid group that is preferably used for the specific resin in the present invention is 0.1 mol% or more and 50 mol% or less, and particularly preferably a pattern by alkali development. From the viewpoint of strength damage suppression, it is 1 mol% or more and 30 mol% or less.
- Examples of the basic group include a primary amino group, a secondary amino group, a tertiary amino group, a heterocyclic ring containing an N atom, and an amide group. Particularly preferred are tertiary amino groups that have good adsorption power to the pigment and high dispersibility. As said basic group, these can be used individually by 1 type or in combination of 2 or more types.
- the content of the copolymerization component forming the structural unit having a basic group that is preferably used for the specific resin in the present invention is 0.01 mol% or more and 50 mol% or less, and particularly preferably developability inhibition. From the viewpoint of suppression, it is 0.01 mol% or more and 30 mol% or less.
- the specific resin in the present invention includes a copolymer component that forms a structural unit having various acid groups listed as the acid group, and a structural unit having various basic groups listed as the basic group. May be used as a copolymer component by appropriately combining with a copolymer component that forms.
- Examples of the coordinating group and the reactive group include acetylacetoxy group, trialkoxysilyl group, isocyanate group, acid anhydride residue, acid chloride residue and the like. Particularly preferred are acetylacetoxy groups that have good adsorptive power to pigments and high dispersibility.
- the coordinating group and the reactive group these can be used alone or in combination of two or more.
- the content of the copolymer component constituting these structural units preferably used for the specific resin in the present invention is 0.5 mol% or more and 50 mol% or less, and particularly preferably a viewpoint of inhibiting developability inhibition. From 1 mol% to 30 mol%.
- the functional group structure capable of interacting with titanium dioxide other than the graft chain is not particularly limited as long as it contains a functional group capable of interacting with titanium dioxide other than the graft chain described above. It is preferable to have at least one repeating unit obtained from a monomer represented by any one of the following general formulas (i) to (iii).
- R 1 , R 2 , and R 3 are each independently a hydrogen atom, a halogen atom (eg, fluorine, chlorine, bromine, etc.), or a carbon atom number of 1 to 6
- An alkyl group (for example, a methyl group, an ethyl group, a propyl group, etc.).
- R 1 , R 2 , and R 3 are more preferably a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and most preferably a hydrogen atom or a methyl group.
- R 2 and R 3 are particularly preferably a hydrogen atom.
- X represents an oxygen atom (—O—) or an imino group (—NH—), and is preferably an oxygen atom.
- L is a single bond or a divalent linking group.
- a divalent aliphatic group for example, alkylene group, substituted alkylene group, alkenylene group, substituted alkenylene group, alkynylene group, substituted alkynylene group
- divalent aromatic group for example, arylene group
- a substituted arylene group and a divalent heterocyclic group, and any one of them, an oxygen atom (—O—), a sulfur atom (—S—), an imino group (—NH—), a substituted imino group ( —NR 31 —, where R 31 is an aliphatic group, aromatic group or heterocyclic group) or a combination with a carbonyl group (—CO—).
- the divalent aliphatic group may have a cyclic structure or a branched structure.
- the aliphatic group has preferably 1 to 20 carbon atoms, more preferably 1 to 15 carbon atoms, and still more preferably 1 to 10 carbon atoms.
- the aliphatic group is preferably a saturated aliphatic group rather than an unsaturated aliphatic group.
- the aliphatic group may have a substituent. Examples of the substituent include a halogen atom, a hydroxyl group, an aromatic group, and a heterocyclic group.
- the number of carbon atoms of the divalent aromatic group is preferably 6 to 20, more preferably 6 to 15, and most preferably 6 to 10.
- the aromatic group may have a substituent. Examples of the substituent include a halogen atom, a hydroxyl group, an aliphatic group, an aromatic group, and a heterocyclic group.
- the divalent heterocyclic group preferably has a 5-membered or 6-membered ring as a heterocycle.
- the heterocycle may be condensed with another heterocycle, an aliphatic ring or an aromatic ring.
- the heterocyclic group may have a substituent. Examples of substituents include halogen atoms, hydroxy groups, oxo groups ( ⁇ O), thioxo groups ( ⁇ S), imino groups ( ⁇ NH), substituted imino groups ( ⁇ N—R 32 , where R 32 is a fatty acid Aromatic group, aromatic group or heterocyclic group), aliphatic group, aromatic group and heterocyclic group.
- L is preferably a single bond, an alkylene group or a divalent linking group containing an oxyalkylene structure.
- the oxyalkylene structure is more preferably an oxyethylene structure or an oxypropylene structure.
- L may contain a polyoxyalkylene structure containing two or more oxyalkylene structures.
- the polyoxyalkylene structure is preferably a polyoxyethylene structure or a polyoxypropylene structure.
- the polyoxyethylene structure is represented by — (OCH 2 CH 2 ) n —, and n is preferably an integer of 2 or more, and more preferably an integer of 2 to 10.
- Z represents a functional group capable of forming an interaction with titanium dioxide in addition to the graft chain, and is preferably a carboxylic acid group or a tertiary amino group. It is more preferable that Y represents a methine group or a nitrogen atom.
- R 4 , R 5 , and R 6 are each independently a hydrogen atom, a halogen atom (eg, fluorine, chlorine, bromine, etc.), or an alkyl group having 1 to 6 carbon atoms (eg, , Methyl group, ethyl group, propyl group, etc.), Z, or -LZ.
- L and Z are as defined above.
- R 4 , R 5 and R 6 are preferably a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, more preferably a hydrogen atom.
- R 1 , R 2 , and R 3 are a hydrogen atom or a methyl group, and L includes an alkylene group or an oxyalkylene structure 2
- a compound in which X is an oxygen atom or an imino group and Z is a carboxylic acid group is preferable.
- R 1 is a hydrogen atom or a methyl group
- L is an alkylene group
- Z is a carboxylic acid group
- Y is a methine group. Is preferred.
- a compound in which R 4 , R 5 , and R 6 are a hydrogen atom or a methyl group and Z is a carboxylic acid group is preferable.
- Examples of typical compounds represented by formulas (i) to (iii) include methacrylic acid, crotonic acid, isocrotonic acid, compounds having an addition polymerizable double bond and a hydroxyl group in the molecule (for example, methacrylic acid 2 -Hydroxyethyl) and succinic anhydride, a reaction product of a compound having an addition polymerizable double bond and hydroxyl group in the molecule and a phthalic anhydride, and an addition polymerizable double bond and hydroxyl group in the molecule.
- methacrylic acid, crotonic acid, isocrotonic acid compounds having an addition polymerizable double bond and a hydroxyl group in the molecule (for example, methacrylic acid 2 -Hydroxyethyl) and succinic anhydride, a reaction product of a compound having an addition polymerizable double bond and hydroxyl group in the molecule and a phthalic anhydride, and an addition poly
- a reaction product of a compound having a tetrahydroxyphthalic anhydride a reaction product of a compound having an addition polymerizable double bond and a hydroxyl group in the molecule and trimellitic anhydride, an addition polymerizable double bond and a hydroxyl group in the molecule
- Reaction product of compound having pyromellitic anhydride acrylic acid, acrylic acid dimer, acrylic acid oligomer, maleic acid, itaconic acid, fumaric acid, 4-vinylbenzoic acid, Alkenyl phenols, such as 4-hydroxyphenyl methacrylamide.
- the content of the functional group capable of forming an interaction with titanium dioxide such as a monomer having an acidic group in the specific resin is from the viewpoint of interaction with titanium dioxide, dispersion stability, and permeability of the developer.
- 0.05 mass% to 90 mass% is preferable with respect to specific resin, 1.0 mass% to 80 mass% is more preferable, 10 mass% to 70 mass% is still more preferable.
- the specific resin contained in the titanium dioxide dispersion composition of the present invention is not limited to the structural unit having the graft chain and titanium dioxide for the purpose of improving various properties such as image strength, as long as the effects of the present invention are not impaired.
- the structure having another structural unit having various functions for example, a functional group having an affinity for the dispersion medium used in the dispersion Units can be included as structural units derived from the copolymerization component.
- the copolymer component that can be copolymerized with the specific resin according to the present invention is selected from, for example, acrylic esters, methacrylic esters, styrenes, acrylonitriles, methacrylonitriles, acrylamides, methacrylamides, and the like.
- a radically polymerizable compound is mentioned.
- acrylic esters such as alkyl acrylate (the alkyl group preferably has 1 to 20 carbon atoms), (specifically, for example, benzyl acrylate, 4-biphenyl acrylate, butyl Acrylate, sec-butyl acrylate, t-butyl acrylate, 4-t-butylphenyl acrylate, 4-chlorophenyl acrylate, pentachlorophenyl acrylate, 4-cyanobenzyl acrylate, cyanomethyl acrylate, cyclohexyl acrylate, 2-ethoxyethyl acrylate, ethyl acrylate 2-ethylhexyl acrylate, heptyl acrylate, hexyl acrylate, isobornyl acrylate, isopropyl acrylate, methyl acrylate, 3,5-dimethyl Ruadamantyl acrylate, 2-naphthyl acrylate, ne
- Methacrylic acid esters for example, benzyl methacrylate, 4-biphenyl methacrylate, butyl methacrylate, sec-butyl methacrylate, t-butyl methacrylate, 4-alkyl methacrylate (preferably having 1 to 20 carbon atoms in the alkyl group)) t-butylphenyl methacrylate, 4-chlorophenyl methacrylate, pentachlorophenyl methacrylate, 4-cyanophenyl methacrylate, cyanomethyl methacrylate, cyclohexyl methacrylate, 2-ethoxyethyl methacrylate, ethyl methacrylate, 2-ethylhexyl methacrylate, heptyl methacrylate, hexyl methacrylate, isobol Nyl methacrylate, isopropyl methacrylate, methyl methacrylate, 3,5- Methyl adamantyl meth
- Styrenes such as styrene and alkyl styrene (for example, methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, diethyl styrene, isopropyl styrene, butyl styrene, hexyl styrene, cyclohexyl styrene, decyl styrene, benzyl styrene, chloromethyl styrene, Trifluoromethylstyrene, ethoxymethylstyrene, acetoxymethylstyrene, etc.), alkoxystyrene (eg, methoxystyrene, 4-methoxy-3-methylstyrene, dimethoxystyrene, etc.), halogen styrene (eg, chlorost
- methacrylic acid esters, acrylamides, methacrylamides and styrenes are preferably used, and benzyl methacrylate, t-butyl methacrylate, 4-t-butylphenyl methacrylate, pentachlorophenyl methacrylate, 4-cyanophenyl methacrylate, cyclohexyl methacrylate, ethyl methacrylate, 2-ethylhexyl methacrylate, isobornyl methacrylate, isopropyl methacrylate, methyl methacrylate, 3,5-dimethyladamantyl methacrylate, 2- Naphthyl methacrylate, neopentyl methacrylate, phenyl methacrylate, tetrahydrofurfuryl methacrylate, 2-hydroxyethyl Methacrylate, 3-hydroxypropyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxypropyl methacryl
- Styrene methyl styrene, dimethyl styrene, trimethyl styrene, isopropyl styrene, butyl styrene, cyclohexyl styrene, chloromethyl styrene, trifluoromethyl styrene, ethoxymethyl styrene, acetoxymethyl styrene, methoxy styrene, 4-methoxy-3-methyl styrene , Chlorostyrene, dichlorostyrene, trichlorostyrene, tetrachlorostyrene, pentachlorostyrene, bromostyrene, dibromostyrene, iodostyrene, fluorostyrene, trifluorostyrene, 2-bromo-4-trifluoromethylstyrene, 4-fluoro-3 -Trifluoromethylstyrene.
- radical polymerizable compounds can be used singly or in combination of two or more.
- the content of these copolymerization components preferably used is 0 mol% or more and 90 mol% or less, and particularly preferably 0 mol% or more and 60 mol% or less. When the content is in the above range, sufficient pattern formation can be obtained.
- the specific resin in the present invention can be synthesized by a conventionally known method.
- the solvent used in the synthesis include ethylene dichloride, cyclohexanone, methyl ethyl ketone, acetone, methanol, ethanol, propanol, butanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, 2-methoxyethyl acetate, 1-methoxy- Examples include 2-propanol, 1-methoxy-2-propyl acetate, N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, toluene, ethyl acetate, methyl lactate, and ethyl lactate. These solvents may be used alone or in combination of two or more.
- Specific examples of the specific resin in the present invention include the following exemplary compounds 1 to 16 and exemplary compounds 20 to 71, but the present invention is not limited thereto. Note that the suffix (wt%) indicating the constituent ratio of each constituent unit is based on mass.
- the acid value of the specific resin is preferably in the range of 5.0 mgKOH / g to 200 mgKOH / g, more preferably in the range of 10 mgKOH / g to 150 mgKOH / g, and still more preferably in the range of 15 mgKOH / g to 100 mgKOH / g.
- the following range is preferable. If the acid value is 200 mgKOH / g or less, pattern peeling during development is suppressed, and if it is 5.0 mgKOH / g or more, alkali developability is good.
- the acid value of the specific resin can be calculated, for example, from the average content of acid groups in the specific resin. Moreover, resin which has a desired acid value can be obtained by changing content of the monomer unit containing the acid group which comprises specific resin.
- the weight average molecular weight of the specific resin in the present invention is preferably 10,000 or more and 300,000 or less, and preferably 15,000 or more and 200,000 or less, from the viewpoint of pattern peeling inhibition during development and developability. More preferably, it is 20,000 or more and 100,000 or less, and particularly preferably 25,000 or more and 50,000 or less.
- the weight average molecular weight of specific resin can be measured by GPC (gel permeation chromatography), for example.
- the content of the specific resin with respect to the total solid content of the dispersion composition of the present invention is preferably in the range of 0.1 to 50% by mass from the viewpoint of dispersibility and dispersion stability, and more preferably in the range of 5 to 40% by mass.
- the range of 10 to 30% by mass is more preferable.
- the dispersion composition of the present invention contains a resin other than the specific resin (hereinafter may be referred to as “other resin”) for the purpose of adjusting the dispersibility of the titanium dioxide particles. May be.
- Other resins that can be used in the present invention include polymer dispersants [for example, polyamidoamine and its salt, polycarboxylic acid and its salt, high molecular weight unsaturated acid ester, modified polyurethane, modified polyester, modified poly (meta ) Acrylate, (meth) acrylic copolymer, naphthalene sulfonic acid formalin condensate], polyoxyethylene alkyl phosphate ester, polyoxyethylene alkyl amine, alkanol amine, pigment derivative and the like.
- Other resins can be further classified into linear polymers, terminal-modified polymers, graft polymers, and block polymers based on their structures.
- the other resin is adsorbed on the surface of the titanium dioxide particles and optionally used pigment, and acts to prevent reaggregation. Therefore, a terminal-modified polymer, a graft polymer and a block polymer having an anchor site to the pigment surface can be mentioned as preferred structures. On the other hand, other resins have an effect of promoting adsorption of the dispersed resin by modifying the pigment surface.
- Disperbyk-101 polyamideamine phosphate
- 107 carboxylic acid ester
- 110 copolymer containing an acid group
- 130 polyamide
- 161, 162, 163, 164, 165, 166, 170, 180 polymerized product
- BYK Chemie BYK-P104, P105 (high molecular weight unsaturated polycarboxylic acid) (above, trade name, manufactured by BYK Chemie)
- EFKA 4047, 4050, 4010, 4165 polyurethane type
- EFKA 4330, 4340 block copolymer
- 4400 4402 (modified polyacrylate), 5010 (polyesteramide), 5765 (high molecular weight polycarboxylate), 6220 (Fatty acid polyester), 6745 (phthalo Cyanine derivatives), 6750 (azo pigment derivative) (trade name, manufactured by EFKA Co., Ltd.);
- Adisper PB82 Polyamideamine phosphate
- 107 carboxylic acid ester
- 110 cop
- (C) Solvent Although the dispersion composition of this invention contains a solvent, this solvent can be comprised using various organic solvents.
- Organic solvents that can be used here include acetone, methyl ethyl ketone, cyclohexane, ethyl acetate, ethylene dichloride, tetrahydrofuran, toluene, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether.
- the method for producing the dispersion composition of the present invention is not particularly limited, and a commonly used method for producing a dispersion composition can be applied.
- it can be produced by mixing titanium dioxide particles, a graft copolymer, and a solvent, and dispersing the mixture using a circulation type dispersion device (bead mill) or the like.
- Photosensitive resin composition The photosensitive resin composition of the present invention comprises at least one of the dispersion compositions, at least one polymerizable compound (D), and at least one polymerization initiator, and is necessary. Other ingredients are included accordingly.
- the photosensitive resin composition contains the dispersion composition, excellent resolution can be obtained, and a transparent pattern having a high refractive index and a high transmittance can be formed.
- the (D) polymerizable compound in the present invention is an addition polymerizable compound having at least one ethylenically unsaturated double bond, and preferably has at least one terminal ethylenically unsaturated bond, preferably It is selected from compounds having two or more.
- Such compounds are widely known in the technical field, and can be used without particular limitation in the present invention. These have chemical forms such as monomers, prepolymers, i.e. dimers, trimers and oligomers, or mixtures thereof and copolymers thereof.
- Examples of monomers and copolymers thereof include unsaturated carboxylic acids (for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.), and esters and amides thereof.
- unsaturated carboxylic acids for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.
- esters and amides thereof examples include unsaturated carboxylic acids (for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.), and esters and amides thereof.
- an ester of an unsaturated carboxylic acid and an aliphatic polyhydric alcohol compound, or an amide of an unsaturated carboxylic acid and an aliphatic polyvalent amine compound is used.
- unsaturated carboxylic acid esters or unsaturated carboxylic acid amides having a nucleophilic substituent such as hydroxyl group, amino group, mercapto group, monofunctional or polyfunctional isocyanates, or monofunctional or polyfunctional epoxy An addition reaction product of the above; and a dehydration condensation reaction product of the above unsaturated carboxylic acid ester or unsaturated carboxylic acid amide with a monofunctional or polyfunctional carboxylic acid is also preferably used.
- ester monomer of an aliphatic polyhydric alcohol compound and an unsaturated carboxylic acid include acrylic acid esters such as ethylene glycol diacrylate, triethylene glycol diacrylate, 1,3-butanediol diacrylate, and tetramethylene glycol.
- Methacrylic acid esters include tetramethylene glycol dimethacrylate, triethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolethane trimethacrylate, ethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, Hexanediol dimethacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol dimethacrylate, dipentaerythritol hexamethacrylate, sorbitol trimethacrylate, sorbitol tetramethacrylate, bis [p- (3-methacryloxy- 2-hydroxyp Epoxy) phenyl] dimethyl methane, bis - [p- (me
- Itaconic acid esters include ethylene glycol diitaconate, propylene glycol diitaconate, 1,3-butanediol diitaconate, 1,4-butanediol diitaconate, tetramethylene glycol diitaconate, pentaerythritol diitaconate Sorbitol tetritaconate and the like;
- crotonic acid esters include ethylene glycol dicrotonate, tetramethylene glycol dicrotonate, pentaerythritol dicrotonate, and sorbitol tetradicrotonate;
- isocrotonic acid esters include ethylene glycol diisocrotonate, pentaerythritol diisocrotonate, and sorbitol tetraisocrotonate;
- maleic acid esters include ethylene glycol dimaleate, triethylene glycol dimaleate, pentaery
- esters examples include, for example, aliphatic alcohol esters described in JP-B-51-47334 and JP-A-57-196231, JP-A-59-5240, and JP-A-59-5241. And esters having an aromatic skeleton described in JP-A-2-226149, and esters containing an amino group described in JP-A-1-165613 are preferably used. Furthermore, the ester monomers described above can also be used as a mixture.
- amide monomers of aliphatic polyvalent amine compounds and unsaturated carboxylic acids include methylene bis-acrylamide, methylene bis-methacrylamide, 1,6-hexamethylene bis-acrylamide, 1,6-hexamethylene bis. -Methacrylamide, diethylenetriamine trisacrylamide, xylylene bisacrylamide, xylylene bismethacrylamide and the like.
- examples of other preferable amide-based monomers include monomers having a cyclohexylene structure described in JP-B No. 54-21726.
- a urethane-based addition-polymerizable compound produced by using an addition reaction between an isocyanate and a hydroxyl group is also suitable. Specific examples of such compounds are described in, for example, Japanese Patent Publication No. 48-41708.
- V vinyl monomer having a hydroxyl group represented by the following formula (V) is added to a polyisocyanate compound having two or more isocyanate groups in the molecule.
- R 7 and R 8 each independently represent a hydrogen atom or a methyl group.
- urethane acrylates as described in JP-A-51-37193, JP-B-2-32293, JP-B-2-16765, JP-B-58-49860, JP-B-56- Urethane compounds having an ethylene oxide skeleton described in Japanese Patent No. 17654, Japanese Patent Publication No. 62-39417, and Japanese Patent Publication No. 62-39418 are also suitable.
- polymerizable compounds having an amino structure or a sulfide structure in the molecule described in JP-A-63-277653, JP-A-63-260909, and JP-A-1-105238. Can obtain a photosensitive resin composition having an excellent photosensitive speed.
- polyester acrylates examples include polyester acrylates, epoxy resins and (meth) acrylic acid described in JP-A-48-64183, JP-B-49-43191, JP-B-52-30490, and JP-B-52-30490. Mention may be made of polyfunctional acrylates and methacrylates such as epoxy acrylates obtained by reaction. Further, specific unsaturated compounds described in JP-B-46-43946, JP-B-1-40337, JP-B-1-40336, and vinylphosphonic acid compounds described in JP-A-2-25493 are also included. Can be mentioned. In some cases, a structure containing a perfluoroalkyl group described in JP-A-61-22048 is preferably used. Furthermore, the Japan Adhesion Association magazine vol. 20, no. 7, photocurable monomers and oligomers described on pages 300 to 308 (1984) can also be used.
- the details of usage methods can be arbitrarily set according to the final performance design of the photosensitive resin composition.
- the polymerizable compound preferably has a structure having a high unsaturated group content per molecule, and in many cases, bifunctional or higher.
- those having three or more functionalities are preferable, and furthermore, different functional numbers and / or different polymerizable groups (for example, acrylic acid esters, methacrylic acid esters, styrene compounds, vinyl ether compounds).
- the method of adjusting both sensitivity and intensity is also effective by using both of the above.
- the compatibility of the polymerizable compound with respect to the compatibility and dispersibility with other components contained in the photosensitive resin composition for example, polymerization initiators, light shielding materials (pigments, dyes) such as titanium dioxide), etc. Selection and / or usage is an important factor, for example, the use of low purity compounds or the combined use of two or more other components may improve compatibility.
- a specific structure may be selected for the purpose of improving adhesion to a hard surface such as a substrate.
- the content of the polymerizable compound (D) in the total solid content of the photosensitive resin composition is preferably in the range of 5% by mass to 90% by mass, and preferably in the range of 10% by mass to 85% by mass. More preferably, the range is from 20% by mass to 80% by mass. Within this range, both adhesion sensitivity and developability are good and preferable without lowering the refractive index.
- the photosensitive resin composition of this invention contains a polymerization initiator further from a viewpoint of the further sensitivity improvement.
- a polymerization initiator in this invention what is known as a polymerization initiator described below can be used.
- the polymerization initiator is not particularly limited as long as it has the ability to initiate polymerization of the polymerizable compound, and can be appropriately selected from known polymerization initiators. For example, those having photosensitivity to visible light from the ultraviolet region are preferable. Further, it may be an activator that generates some action with a photoexcited sensitizer and generates an active radical, or may be an initiator that initiates cationic polymerization according to the type of monomer.
- the polymerization initiator preferably contains at least one compound having a molecular extinction coefficient of at least about 50 within a range of about 300 nm to 800 nm (more preferably 330 nm to 500 nm).
- polymerization initiator examples include halogenated hydrocarbon derivatives (for example, those having a triazine skeleton, those having an oxadiazole skeleton, etc.), acylphosphine compounds such as acylphosphine oxide, hexaarylbiimidazole, oxime derivatives. Oxime compounds such as organic peroxides, thio compounds, ketone compounds, aromatic onium salts, ketoxime ethers, aminoacetophenone compounds, and hydroxyacetophenones.
- halogenated hydrocarbon derivatives for example, those having a triazine skeleton, those having an oxadiazole skeleton, etc.
- acylphosphine compounds such as acylphosphine oxide, hexaarylbiimidazole, oxime derivatives.
- Oxime compounds such as organic peroxides, thio compounds, ketone compounds, aromatic onium salts, ketoxime ethers, aminoaceto
- halogenated hydrocarbon compound having a triazine skeleton examples include those described in Wakabayashi et al., Bull. Chem. Soc. Japan, 42, 2924 (1969), a compound described in British Patent No. 1388492, a compound described in JP-A-53-133428, a compound described in German Patent No. 3337024, F.I. C. J. Schaefer et al. Org. Chem. 29, 1527 (1964), compound described in JP-A-62-258241, compound described in JP-A-5-281728, compound described in JP-A-5-34920, US Pat. No. 4,221,976 And the compounds described in the book.
- Examples of the compound described in US Pat. No. 4,221,976 include compounds having an oxadiazole skeleton (for example, 2-trichloromethyl-5-phenyl-1,3,4-oxadiazole, 2- Trichloromethyl-5- (4-chlorophenyl) -1,3,4-oxadiazole, 2-trichloromethyl-5- (1-naphthyl) -1,3,4-oxadiazole, 2-trichloromethyl-5 -(2-naphthyl) -1,3,4-oxadiazole, 2-tribromomethyl-5-phenyl-1,3,4-oxadiazole, 2-tribromomethyl-5- (2-naphthyl) 1,3,4-oxadiazole; 2-trichloromethyl-5-styryl-1,3,4-oxadiazole, 2-trichloromethyl-5- (4-chlorostyryl) ) -1,3,4-oxadiazole, 2-trichloromethyl
- polyhalogen compounds for example, 4-phenyl acridine, such as 9-phenylacridine, 1,7-bis (9,9′-acridinyl) heptane), N-phenylglycine, and the like Carbon bromide, phenyltribromomethylsulfone, phenyltrichloromethylketone, etc.
- coumarins for example, 3- (2-benzofuranoyl) -7-diethylaminocoumarin, 3- (2-benzofuroyl) -7- (1- Pyrrolidinyl) coumarin, 3-benzoyl-7-diethylaminocoumarin, 3- (2-methoxybenzoyl) -7-diethylaminocoumarin, 3- (4-dimethylaminobenzoyl) -7-diethylaminocoumarin, 3,3′-carbonylbis ( 5,7-di-n-propoxycoumarin), 3,3
- ketone compound examples include benzophenone, 2-methylbenzophenone, 3-methylbenzophenone, 4-methylbenzophenone, 4-methoxybenzophenone, 2-chlorobenzophenone, 4-chlorobenzophenone, 4-bromobenzophenone, 2-carboxybenzophenone, 2-Ethoxycarbonylbenzophenone, benzophenonetetracarboxylic acid or tetramethyl ester thereof, 4,4′-bis (dialkylamino) benzophenone (for example, 4,4′-bis (dimethylamino) benzophenone, 4,4′-bisdicyclohexyl) Amino) benzophenone, 4,4'-bis (diethylamino) benzophenone, 4,4'-bis (dihydroxyethylamino) benzophenone, 4-methoxy-4'-dimethylamino Nzophenone, 4,4'-dimethoxybenzophenone, 4-dimethylaminobenzophenone
- hydroxyacetophenone compounds As the polymerization initiator, hydroxyacetophenone compounds, aminoacetophenone compounds, and acylphosphine compounds can also be suitably used. More specifically, for example, aminoacetophenone initiators described in JP-A-10-291969 and acylphosphine oxide initiators described in Japanese Patent No. 4225898 can also be used.
- hydroxyacetophenone-based initiator IRGACURE-184, DAROCUR-1173, IRGACURE-500, IRGACURE-2959, IRGACURE-127 (trade names: all manufactured by Ciba Japan) can be used.
- aminoacetophenone initiator commercially available products IRGACURE-907, IRGACURE-369, and IRGACURE-379 (trade names: all manufactured by Ciba Japan Co., Ltd.) can be used.
- aminoacetophenone-based initiator compounds described in JP-A-2009-191179 whose absorption wavelength is matched with a long wave light source of 365 nm or 405 nm can also be used.
- acylphosphine-based initiator commercially available products such as IRGACURE-819 and DAROCUR-TPO (trade names: both manufactured by Ciba Japan) can be used.
- More preferable examples of the polymerization initiator include oxime compounds.
- Specific examples of the oxime initiator include compounds described in JP-A No. 2001-233842, compounds described in JP-A No. 2000-80068, and compounds described in JP-A No. 2006-342166.
- oxime ester compounds examples include J.M. C. S. Perkin II (1979) pp. 1653-1660), J.M. C. S. Perkin II (1979) pp. 156-162, Journal of Photopolymer Science and Technology (1995) pp. 202-232, compounds described in JP-A No. 2000-66385, compounds described in JP-A Nos. 2000-80068, JP-T 2004-534797, JP-A No. 2006-342166, and the like.
- IRGACURE-OXE01 manufactured by Ciba Japan
- IRGACURE-OXE02 manufactured by Ciba Japan
- oxime ester compounds other than those described above compounds described in JP-T-2009-519904 in which oxime is linked to carbazole N-position, compounds described in US Pat. No. 7,626,957 in which a hetero substituent is introduced into the benzophenone moiety, A compound described in Japanese Patent Application Laid-Open No. 2010-15025 and US Patent Publication No. 2009-292039 in which a nitro group is introduced at the dye moiety, a ketoxime compound described in International Patent Publication No. 2009-131189, the triazine skeleton and the oxime skeleton are the same A compound described in US Pat. No. 7,556,910 contained in the molecule, a compound described in Japanese Patent Application Laid-Open No. 2009-221114 having an absorption maximum at 405 nm and good sensitivity to a g-line light source, and the like may be used. .
- cyclic oxime compounds described in JP-A-2007-231000 and JP-A-2007-322744 can also be suitably used for the cyclic oxime compounds described in JP-A-2007-231000 and JP-A-2007-322744.
- cyclic oxime compounds in particular, cyclic oxime compounds fused to carbazole dyes described in JP2010-32985A and JP2010-185072A have high light absorptivity and high sensitivity. preferable.
- the compounds described in JP-A-2009-242469 having an unsaturated bond at a specific site of the oxime compound can be preferably used because high sensitivity can be achieved by regenerating the active radical from the polymerization inert radical. it can.
- an oxime compound having a specific substituent as disclosed in JP-A-2007-269979 and an oxime compound having a thioaryl group as described in JP-A-2009-191061 are exemplified.
- the oxime polymerization initiator is preferably a compound represented by the following formula (OX-1).
- the oxime N—O bond may be an (E) oxime compound, a (Z) oxime compound, or a mixture of (E) and (Z) isomers. .
- R and B each independently represent a monovalent substituent, A represents a divalent organic group, and Ar represents an aryl group.
- the monovalent substituent represented by R is preferably a monovalent nonmetallic atomic group.
- the monovalent nonmetallic atomic group include an alkyl group, an aryl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a heterocyclic group, an alkylthiocarbonyl group, and an arylthiocarbonyl group.
- these groups may have one or more substituents.
- the substituent mentioned above may be further substituted by another substituent.
- substituents examples include a halogen atom, an aryloxy group, an alkoxycarbonyl group or an aryloxycarbonyl group, an acyloxy group, an acyl group, an alkyl group, and an aryl group.
- the alkyl group which may have a substituent is preferably an alkyl group having 1 to 30 carbon atoms, and specifically includes a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, an octyl group, and a decyl group.
- the aryl group which may have a substituent is preferably an aryl group having 6 to 30 carbon atoms, and specifically includes a phenyl group, a biphenyl group, a 1-naphthyl group, a 2-naphthyl group, and a 9-anthryl group.
- 9-phenanthryl group 1-pyrenyl group, 5-naphthacenyl group, 1-indenyl group, 2-azurenyl group, 9-fluorenyl group, terphenyl group, quarterphenyl group, o-tolyl group, m-tolyl group, p -Tolyl group, xylyl group, o-cumenyl group, m-cumenyl group and p-cumenyl group, mesityl group, pentarenyl group, binaphthalenyl group, turnaphthalenyl group, quarternaphthalenyl group, heptaenyl group, biphenylenyl group, indacenyl group, full Oranthenyl, acenaphthylenyl, aceanthrylenyl, phenalenyl, fluorenyl, Tolyl group, bianthracenyl group, teranthracenyl group, quarteranth
- the acyl group which may have a substituent is preferably an acyl group having 2 to 20 carbon atoms, specifically, an acetyl group, a propanoyl group, a butanoyl group, a trifluoroacetyl group, a pentanoyl group, a benzoyl group, 1-naphthoyl group, 2-naphthoyl group, 4-methylsulfanylbenzoyl group, 4-phenylsulfanylbenzoyl group, 4-dimethylaminobenzoyl group, 4-diethylaminobenzoyl group, 2-chlorobenzoyl group, 2-methylbenzoyl group, 2 -Methoxybenzoyl group, 2-butoxybenzoyl group, 3-chlorobenzoyl group, 3-trifluoromethylbenzoyl group, 3-cyanobenzoyl group, 3-nitrobenzoyl group, 4-fluorobenzoyl group, 4-cyanobenz
- the alkoxycarbonyl group which may have a substituent is preferably an alkoxycarbonyl group having 2 to 20 carbon atoms, and specifically includes a methoxycarbonyl group, an ethoxycarbonyl group, a propoxycarbonyl group, a butoxycarbonyl group, a hexyloxy group. Examples thereof include a carbonyl group, an octyloxycarbonyl group, a decyloxycarbonyl group, an octadecyloxycarbonyl group, and a trifluoromethyloxycarbonyl group.
- the heterocyclic group which may have a substituent is preferably an aromatic or aliphatic heterocyclic ring containing a nitrogen atom, an oxygen atom, a sulfur atom or a phosphorus atom.
- thienyl group benzo [b] thienyl group, naphtho [2,3-b] thienyl group, thiantenyl group, furyl group, pyranyl group, isobenzofuranyl group, chromenyl group, xanthenyl group, phenoxathiyl Nyl group, 2H-pyrrolyl group, pyrrolyl group, imidazolyl group, pyrazolyl group, pyridyl group, pyrazinyl group, pyrimidinyl group, pyridazinyl group, indolizinyl group, isoindolyl group, 3H-indolyl group, indolyl group, 1H-indazolyl group, pur
- alkylthiocarbonyl group which may have a substituent include a methylthiocarbonyl group, a propylthiocarbonyl group, a butylthiocarbonyl group, a hexylthiocarbonyl group, an octylthiocarbonyl group, a decylthiocarbonyl group, and an octadecylthiocarbonyl group.
- Examples thereof include a group and a trifluoromethylthiocarbonyl group.
- the monovalent substituent represented by B represents an aryl group, a heterocyclic group, an arylcarbonyl group, or a heterocyclic carbonyl group. These groups may have one or more substituents. Examples of the substituent include the above-described substituents. Moreover, the substituent mentioned above may be further substituted by another substituent.
- Y, X, and n have the same meanings as Y, X, and n in formula (OX-2) described later, and preferred examples are also the same.
- examples of the divalent organic group represented by A include an alkylene group having 1 to 12 carbon atoms, a cycloalkylene group, and an alkynylene group. These groups may have one or more substituents. Examples of the substituent include the above-described substituents. Moreover, the substituent mentioned above may be further substituted by another substituent. Among them, A in the formula (OX-1) is an unsubstituted alkylene group, an alkyl group (for example, a methyl group, an ethyl group, a tert-butyl group, dodecyl) from the viewpoint of increasing sensitivity and suppressing coloring due to heating.
- an alkyl group for example, a methyl group, an ethyl group, a tert-butyl group, dodecyl
- alkylene group alkenyl group (eg vinyl group, allyl group) alkylene group, aryl group (eg phenyl group, p-tolyl group, xylyl group, cumenyl group, naphthyl group, anthryl) Group, a phenanthryl group, and a styryl group) are preferable.
- alkenyl group eg vinyl group, allyl group
- aryl group eg phenyl group, p-tolyl group, xylyl group, cumenyl group, naphthyl group, anthryl
- a phenanthryl group e.g., phenanthryl group
- styryl group alkylene group substituted alkylene group
- alkenyl group eg vinyl group, allyl group
- aryl group eg phenyl group, p-tolyl group, xylyl group, cumenyl group, naphth
- the aryl group represented by Ar is preferably an aryl group having 6 to 30 carbon atoms, and may have a substituent.
- substituents include the same substituents as those introduced into the substituted aryl group mentioned above as specific examples of the aryl group which may have a substituent.
- a substituted or unsubstituted phenyl group is preferable from the viewpoint of increasing sensitivity and suppressing coloring due to heating.
- the oxime compound is preferably a compound represented by the following formula (OX-2).
- R and X each independently represent a monovalent substituent
- a and Y each independently represent a divalent organic group
- Ar represents an aryl group
- n represents 0 to (It is an integer of 5.)
- R, A and Ar in the formula (OX-2) have the same meanings as R, A and Ar in the formula (OX-1), and preferred examples are also the same.
- examples of the monovalent substituent represented by X include an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an acyloxy group, an acyl group, an alkoxycarbonyl group, an amino group, and a heterocyclic ring.
- X in the formula (OX-2) is preferably an alkyl group from the viewpoints of solvent solubility and improvement in absorption efficiency in the long wavelength region.
- n represents an integer of 0 to 5, and an integer of 0 to 2 is preferable.
- examples of the divalent organic group represented by Y include the following structures.
- “*” represents a bonding position between Y and an adjacent carbon atom in the formula (OX-2).
- the oxime compound is preferably a compound represented by the following formula (OX-3).
- R and X each independently represent a monovalent substituent, A represents a divalent organic group, Ar represents an aryl group, and n is an integer of 0 to 5. .
- R, X, A, Ar, and n in formula (OX-3) have the same meanings as R, X, A, Ar, and n in formula (OX-2), respectively, and preferred examples are also the same. is there.
- the oxime compound has a maximum absorption wavelength in a wavelength region of 350 nm to 500 nm, preferably has an absorption wavelength in a wavelength region of 360 nm to 480 nm, and particularly preferably has a high absorbance at 365 nm and 455 nm.
- the molar extinction coefficient at 365 nm or 405 nm of the oxime compound is preferably from 1,000 to 300,000, more preferably from 2,000 to 300,000, more preferably from 5,000 to 200, from the viewpoint of sensitivity. Is particularly preferred.
- a known method can be used for the molar extinction coefficient of the compound. Specifically, for example, 0.01 g of an ultraviolet-visible spectrophotometer (Varian Inc., Carry-5 spctrophotometer) is used with an ethyl acetate solvent. It is preferable to measure at a concentration of / L.
- the polymerization initiator used in the present invention may be used in combination of two or more as required.
- the polymerization initiator (E) used in the photosensitive resin composition of the present invention from the viewpoint of exposure sensitivity, a trihalomethyltriazine compound, a benzyldimethyl ketal compound, an ⁇ -hydroxyketone compound, an ⁇ -aminoketone compound, an acylphosphine compound Phosphine oxide compound, metallocene compound, oxime compound, triallylimidazole dimer, onium compound, benzothiazole compound, benzophenone compound, acetophenone compound and derivatives thereof, cyclopentadiene-benzene-iron complex and salt thereof, halomethyloxadiazole compound And compounds selected from the group consisting of 3-aryl substituted coumarin compounds.
- trihalomethyltriazine compounds More preferred are trihalomethyltriazine compounds, ⁇ -aminoketone compounds, acylphosphine compounds, phosphine oxide compounds, oxime compounds, triallylimidazole dimers, onium compounds, benzophenone compounds, acetophenone compounds, trihalomethyltriazine compounds, ⁇ -aminoketones
- Most preferred is at least one compound selected from the group consisting of compounds, oxime compounds, triallylimidazole dimer, and benzophenone compounds.
- the photosensitive resin composition of the present invention when used for the production of a color filter of a solid-state imaging device, it is necessary to form a fine pattern with a sharp shape, so that a residue is left in the unexposed area along with curability. It is important that there is no development. From such a viewpoint, it is particularly preferable to use an oxime compound as the polymerization initiator.
- an oxime compound as the polymerization initiator (E) for forming a fine pattern such as a solid-state imaging device.
- the content of the (E) polymerization initiator contained in the photosensitive resin composition of the present invention is preferably 0.1% by mass or more and 50% by mass or less based on the total solid content of the photosensitive resin composition, More preferably, they are 0.5 mass% or more and 30 mass% or less, More preferably, they are 1 mass% or more and 20 mass% or less. Within this range, good sensitivity and pattern formability can be obtained.
- the content of titanium dioxide relative to the total solid content of the photosensitive resin composition of the present invention is preferably in the range of 0.1 to 60% by mass from the viewpoint of expressing necessary resolution and imparting developability.
- the range of 1 to 40% by mass is more preferable, and the range of 5 to 30% by mass is more preferable.
- the photosensitive resin composition of the present invention may further contain optional components described in detail below, if necessary. Hereinafter, optional components that the photosensitive resin composition may contain will be described.
- Sensitizer The photosensitive resin composition of the present invention may contain a sensitizer for the purpose of (E) improving the radical generation efficiency of the polymerization initiator and increasing the photosensitive wavelength.
- the sensitizer that can be used in the present invention those that sensitize the above-described (E) polymerization initiator by an electron transfer mechanism or an energy transfer mechanism are preferable.
- sensitizer examples include those belonging to the compounds listed below and having an absorption wavelength in a wavelength region of 300 nm to 450 nm. That is, for example, polynuclear aromatics (for example, phenanthrene, anthracene, pyrene, perylene, triphenylene, 9,10-dialkoxyanthracene), xanthenes (for example, fluorescein, eosin, erythrosine, rhodamine B, rose bengal), Thioxanthones (isopropylthioxanthone, diethylthioxanthone, chlorothioxanthone), cyanines (eg thiacarbocyanine, oxacarbocyanine), merocyanines (eg merocyanine, carbomerocyanine), phthalocyanines, thiazines (eg thionine, methylene blue, Toluidine blue), acridines (eg
- sensitizer that can be used in the present invention, more preferred examples include compounds represented by the following general formulas (e-1) to (e-4).
- a 1 represents a sulfur atom or NR 50
- R 50 represents an alkyl group or an aryl group
- L 1 represents a basic nucleus of the dye in combination with the adjacent A 1 and the adjacent carbon atom.
- R 51 and R 52 each independently represents a hydrogen atom or a monovalent nonmetallic atomic group, and R 51 and R 52 are bonded to each other to form an acidic nucleus of the dye. May be.
- W represents an oxygen atom or a sulfur atom.
- Ar 1 and Ar 2 each independently represent an aryl group, and are linked via a bond with —L 2 —.
- W is synonymous with that shown in formula (e-1).
- a 2 represents a sulfur atom or NR 59
- L 3 represents a nonmetallic atomic group that forms a basic nucleus of a dye in combination with adjacent A 2 and a carbon atom
- R 53 , R 54 , R 55 , R 56 , R 57 and R 58 each independently represents a monovalent non-metallic atomic group
- R 59 represents an alkyl group or an aryl group.
- a 3 and A 4 each independently represent —S— or —NR 62
- R 62 represents a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group.
- L 4 represents a non-metallic atomic group that forms a basic nucleus of the dye together with adjacent A 3 and a carbon atom
- L 5 represents a basicity of the dye combined with adjacent A 4 and a carbon atom.
- R 60 and R 61 each independently represent a monovalent nonmetallic atomic group, or may be bonded to each other to form an aliphatic or aromatic ring. it can.
- the content of the sensitizer in the photosensitive resin composition is 0.1% by mass or more and 20% by mass or less in terms of solid content from the viewpoint of light absorption efficiency in the deep part and decomposition efficiency of the initiator. Preferably, it is 0.5 mass% or more and 15 mass% or less.
- a sensitizer may be used individually by 1 type and may use 2 or more types together.
- a compound represented by the following general formula (II) and a compound represented by the general formula (III) there is at least one selected. These may be used alone or in combination of two or more.
- R 11 and R 12 each independently represent a monovalent substituent
- R 13 , R 14 , R 15 and R 16 each independently represent a hydrogen atom or a monovalent substituent.
- n represents an integer of 0 to 5
- n ′ represents an integer of 0 to 5
- n and n ′ cannot both be 0.
- n is 2 or more
- a plurality of R 11 may be the same or different.
- n ′ is 2 or more
- a plurality of R 12 may be the same or different.
- the isomer by the double bond is not limited to either.
- the compound represented by the general formula (II) preferably has a molar extinction coefficient ⁇ at a wavelength of 365 nm of 500 mol ⁇ 1 ⁇ L ⁇ cm ⁇ 1 or more, and ⁇ at a wavelength of 365 nm of 3000 mol ⁇ 1 ⁇ L ⁇ cm ⁇ . more preferably 1 or more, and most preferably ⁇ at a wavelength of 365nm is 20000mol -1 ⁇ L ⁇ cm -1 or more. It is preferable that the value of the molar extinction coefficient ⁇ at each wavelength is in the above range because the sensitivity improvement effect is high from the viewpoint of light absorption efficiency.
- a 5 represents an aromatic ring or a hetero ring which may have a substituent
- X 4 represents an oxygen atom, a sulfur atom, or —N (R 23 ) —
- Y represents oxygen It represents an atom, a sulfur atom, or —N (R 23 ) —.
- R 21 , R 22 , and R 23 each independently represent a hydrogen atom or a monovalent nonmetallic atomic group, and A 5 , R 21 , R 22 , and R 23 are bonded to each other to form an aliphatic group Or aromatic rings may be formed.
- R 21 , R 22 , and R 23 each independently represent a hydrogen atom or a monovalent nonmetallic atomic group.
- R 21 , R 22 , and R 23 represent a monovalent nonmetal atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted fragrance It is preferably a group heterocyclic residue, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkylthio group, a hydroxyl group, or a halogen atom.
- Y is preferably an oxygen atom or —N (R 23 ) — from the viewpoint of improving the decomposition efficiency of the photopolymerization initiator.
- R 23 represents a hydrogen atom or a monovalent nonmetallic atomic group. Further, Y is most preferably —N (R 23 ) —.
- the photosensitive resin composition of the present invention preferably further contains a co-sensitizer.
- the co-sensitizer has effects such as (E) further improving the sensitivity of the polymerization initiator and sensitizer to actinic radiation, or suppressing the inhibition of polymerization of the polymerizable compound (D) by oxygen. .
- co-sensitizers examples include amines such as M.I. R. Sander et al., “Journal of Polymer Society”, Vol. 10, page 3173 (1972), Japanese Patent Publication No. 44-20189, Japanese Patent Publication No. 51-82102, Japanese Patent Publication No. 52-134692, Japanese Patent Publication No. 59-138205. No. 60-84305, JP-A 62-18537, JP-A 64-33104, Research Disclosure 33825, and the like. Specific examples include triethanolamine. P-dimethylaminobenzoic acid ethyl ester, p-formyldimethylaniline, p-methylthiodimethylaniline and the like.
- co-sensitizers include thiols and sulfides such as thiol compounds described in JP-A-53-702, JP-B-55-500806, JP-A-5-142772, No. 56-75643, such as 2-mercaptobenzothiazole, 2-mercaptobenzoxazole, 2-mercaptobenzimidazole, 2-mercapto-4 (3H) -quinazoline, ⁇ -mercapto. And naphthalene.
- thiols and sulfides such as thiol compounds described in JP-A-53-702, JP-B-55-500806, JP-A-5-142772, No. 56-75643, such as 2-mercaptobenzothiazole, 2-mercaptobenzoxazole, 2-mercaptobenzimidazole, 2-mercapto-4 (3H) -quinazoline, ⁇ -mercapto. And naphthalene.
- co-sensitizers include amino acid compounds (eg, N-phenylglycine), organometallic compounds described in JP-B-48-42965 (eg, tributyltin acetate), JP-B 55- And a hydrogen donor described in JP 34414 and a sulfur compound (eg, trithiane) described in JP-A-6-308727.
- amino acid compounds eg, N-phenylglycine
- organometallic compounds described in JP-B-48-42965 eg, tributyltin acetate
- a hydrogen donor described in JP 34414
- a sulfur compound eg, trithiane
- the content of these co-sensitizers is 0.1% by mass or more and 30% by mass with respect to the mass of the total solid content of the photosensitive resin composition from the viewpoint of improving the curing rate due to the balance between polymerization growth rate and chain transfer.
- the following ranges are preferable, the range of 1% by mass to 25% by mass is more preferable, and the range of 1.5% by mass to 20% by mass is more preferable.
- Polymerization inhibitor in the present invention, a polymerization inhibitor is added in order to prevent unnecessary polymerization of a compound having an ethylenically unsaturated double bond that can be polymerized during production or storage of the photosensitive resin composition.
- Polymerization inhibitors that can be used in the present invention include hydroxyl group-containing phenol compounds, N-oxide compounds, piperidine 1-oxyl free radical compounds, pyrrolidine 1-oxyl free radical compounds, N-nitrosophenylhydroxylamines, diazonium compounds And transition dye compounds such as cationic dyes, sulfide group-containing compounds, nitro group-containing compounds, FeCl 3 , CuCl 2 and the like.
- Hydroxyl group-containing phenol compounds are hydroquinone, p-methoxyphenol, di-t-butyl-p-cresol, pyrogallol, t-butylcatechol, benzoquinone, 4,4-thiobis (3-methyl-6-t-butylphenol), 2 2,2′-methylenebis (4-methyl-6-tert-butylphenol), a phenolic resin, and a compound selected from the group consisting of cresol resins.
- N-oxide compounds are 5,5-dimethyl-1-pyrroline N-oxide, 4-methylmorpholine N-oxide, pyridine N-oxide, 4-nitropyridine N-oxide, 3-hydroxypyridine N-oxide, picoline A compound selected from the group consisting of acid N-oxide, nicotinic acid N-oxide, and isonicotinic acid N-oxide is preferred.
- Piperidine 1-oxyl free radical compounds include piperidine 1-oxyl free radical, 2,2,6,6-tetramethylpiperidine 1-oxyl free radical, 4-oxo-2,2,6,6-tetramethylpiperidine 1 -Oxyl free radical, 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl free radical, 4-acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl free radical, 4-maleimide A compound selected from the group consisting of -2,2,6,6-tetramethylpiperidine 1-oxyl free radical and 4-phosphonoxy-2,2,6,6-tetramethylpiperidine 1-oxyl free radical Is preferred.
- the pyrrolidine 1-oxyl free radical compound is preferably a 3-carboxyproxyl free radical (3-carboxy-2,2,5,5-tetramethylpyrrolidine 1-oxyl free radical).
- N-nitrosophenylhydroxylamines are preferably compounds selected from the group consisting of N-nitrosophenylhydroxylamine cerium salts and N-nitrosophenylhydroxylamine aluminum salts.
- the diazonium compound is selected from the group consisting of 4-diazophenyldimethylamine hydrogen sulfate, 4-diazodiphenylamine tetrafluoroborate, and 3-methoxy-4-diazodiphenylamine hexafluorophosphate Is preferred.
- phenolic polymerization inhibitors include the following exemplified compounds (P-1) to (P-24).
- Examples of amine polymerization inhibitors include the following exemplary compounds (N-1) to (N-7).
- sulfur polymerization inhibitors include the following exemplary compounds (S-1) to (S-5).
- Examples of phosphite polymerization inhibitors include the following exemplary compounds (R-1) to (R-5).
- each compound shown below can also be used as a suitable polymerization inhibitor.
- a preferable addition amount of the polymerization inhibitor is preferably 0.01 parts by mass or more and 10 parts by mass or less, and more preferably 0.01 parts by mass or more and 8 parts by mass or less with respect to 100 parts by mass of the polymerization initiator (E). It is preferable that it is in the range of 0.05 parts by mass or more and 5 parts by mass or less. By setting it as the said range, the curing reaction suppression in a non-image part and the curing reaction acceleration in an image part are fully performed, and image forming property and a sensitivity become favorable.
- the photosensitive resin composition of this invention contains at least 1 sort (s) of binder polymer from viewpoints, such as a resolution and a film
- a linear organic polymer as the binder polymer.
- a linear organic polymer a well-known thing can be used arbitrarily.
- a linear organic polymer that is soluble or swellable in water or weak alkaline water is selected to enable water development or weak alkaline water development.
- the linear organic polymer is selected and used not only as a film forming agent but also according to the use as water, weak alkaline water or an organic solvent developer. For example, when a water-soluble organic polymer is used, water development becomes possible.
- linear organic polymer examples include radical polymers having a carboxylic acid group in the side chain, such as JP-A-59-44615, JP-B-54-34327, JP-B-58-12777, and JP-B-sho. No. 54-25957, JP-A-54-92723, JP-A-59-53836, JP-A-59-71048, ie, a monomer having a carboxyl group alone or Copolymerized resin, acid anhydride monomer alone or copolymerized, acid anhydride unit hydrolyzed, half esterified or half amidated, epoxy resin unsaturated monocarboxylic acid and acid anhydride Examples include modified epoxy acrylate.
- Examples of the monomer having a carboxyl group include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, and 4-carboxylstyrene.
- Examples of the monomer having an acid anhydride include maleic anhydride. It is done.
- those obtained by adding a cyclic acid anhydride to a polymer having a hydroxyl group are useful.
- a monomer other than the above-mentioned monomers can also be used as the compound to be copolymerized.
- examples of other monomers include the following compounds (1) to (12).
- Vinyl ethers such as ethyl vinyl ether, 2-chloroethyl vinyl ether, hydroxyethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, octyl vinyl ether, and phenyl vinyl ether.
- Vinyl esters such as vinyl acetate, vinyl chloroacetate, vinyl butyrate and vinyl benzoate.
- Styrenes such as styrene, ⁇ -methylstyrene, methylstyrene, chloromethylstyrene, and p-acetoxystyrene.
- Vinyl ketones such as methyl vinyl ketone, ethyl vinyl ketone, propyl vinyl ketone, and phenyl vinyl ketone.
- Olefins such as ethylene, propylene, isobutylene, butadiene, and isoprene.
- N-vinylpyrrolidone (10) N-vinylpyrrolidone, acrylonitrile, methacrylonitrile and the like.
- Unsaturated imides such as maleimide, N-acryloylacrylamide, N-acetylmethacrylamide, N-propionylmethacrylamide, N- (p-chlorobenzoyl) methacrylamide.
- a methacrylic acid monomer having a hetero atom bonded to the ⁇ -position For example, compounds described in JP-A-2002-309057, JP-A-2002-311569 and the like can be mentioned.
- the binder polymer preferably also contains a repeating unit formed by polymerizing a monomer component essentially comprising a compound represented by the following general formula (ED) (hereinafter sometimes referred to as “ether dimer”). .
- ED general formula
- R 1 and R 2 each independently represents a hydrogen atom or a hydrocarbon group having 1 to 25 carbon atoms which may have a substituent.
- the curable resin composition of this invention can form the cured coating film which was extremely excellent also in heat resistance and transparency.
- the hydrocarbon group having 1 to 25 carbon atoms which may have a substituent represented by R 1 and R 2 is not particularly limited.
- Linear or branched alkyl groups such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, t-amyl, stearyl, lauryl, 2-ethylhexyl; aryl groups such as phenyl; Alicyclic groups such as cyclohexyl, t-butylcyclohexyl, dicyclopentadienyl, tricyclodecanyl, isobornyl, adamantyl, 2-methyl-2-adamantyl; substituted with alkoxy such as 1-methoxyethyl, 1-ethoxyethyl An alkyl group substituted with an aryl group such as benzyl; and the like.
- an acid such as methyl, ethyl, cyclohexyl, benzyl or the like, or a primary or secondary carbon substituent which is difficult to be
- ether dimer examples include dimethyl-2,2 ′-[oxybis (methylene)] bis-2-propenoate, diethyl-2,2 ′-[oxybis (methylene)] bis-2-propenoate, (N-propyl) -2,2 ′-[oxybis (methylene)] bis-2-propenoate, di (isopropyl) -2,2 ′-[oxybis (methylene)] bis-2-propenoate, di (n-butyl) ) -2,2 ′-[oxybis (methylene)] bis-2-propenoate, di (isobutyl) -2,2 ′-[oxybis (methylene)] bis-2-propenoate, di (t-butyl) -2, 2 ′-[oxybis (methylene)] bis-2-propenoate, di (t-amyl) -2,2 ′-[oxybis (methylene)] bis-2-prope , Di (stearyl) -2,2,2
- dimethyl-2,2 '-[oxybis (methylene)] bis-2-propenoate, diethyl-2,2'-[oxybis (methylene)] bis-2-propenoate, dicyclohexyl-2,2'- [Oxybis (methylene)] bis-2-propenoate and dibenzyl-2,2 ′-[oxybis (methylene)] bis-2-propenoate are preferred.
- These ether dimers may be used alone or in combination of two or more.
- the structure derived from the compound represented by the general formula (ED) may be copolymerized with other monomers.
- a (meth) acrylic resin having an allyl group, a vinyl ester group, and a carboxyl group in the side chain, and a side chain described in JP-A Nos. 2000-187322 and 2002-62698 are doubled.
- An alkali-soluble resin having a bond and an alkali-soluble resin having an amide group in the side chain described in JP-A No. 2001-242612 are preferable because of excellent balance of film strength, sensitivity, and developability.
- Japanese Patent Publication No. 7-12004 Japanese Patent Publication No. 7-120041, Japanese Patent Publication No. 7-120042, Japanese Patent Publication No. 8-12424, Japanese Patent Publication No. 63-287944, Japanese Patent Publication No. 63-287947.
- Urethane binder polymers containing acid groups as described in JP-A-1-271741 and the like, and urethane binders having acid groups and double bonds in side chains as described in JP-A-2002-107918 Since the polymer is very excellent in strength, it is advantageous in terms of film strength and / or suitability for low exposure.
- the weight average molecular weight of the binder polymer that can be used in the photosensitive resin composition of the present invention is preferably 5,000 or more, more preferably 10,000 to 300,000, and the number average molecular weight is preferably Is 1,000 or more, and more preferably 2,000 or more and 250,000 or less.
- the polydispersity (weight average molecular weight / number average molecular weight) is preferably 1 or more, more preferably 1.1 or more and 10 or less.
- These binder polymers may be any of random polymers, block polymers, graft polymers and the like.
- the binder polymer that can be used in the present invention can be synthesized by a conventionally known method.
- the solvent used in the synthesis include tetrahydrofuran, ethylene dichloride, cyclohexanone, methyl ethyl ketone, acetone, methanol, ethanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, 2-methoxyethyl acetate, diethylene glycol dimethyl ether, 1-methoxy.
- Examples include -2-propanol, 1-methoxy-2-propyl acetate, N, N-dimethylformamide, N, N-dimethylacetamide, toluene, ethyl acetate, methyl lactate, ethyl lactate, dimethyl sulfoxide, water and the like. These solvents are used alone or in combination of two or more.
- Examples of the radical polymerization initiator used when synthesizing the binder polymer that can be used in the photosensitive resin composition of the present invention include known compounds such as an azo initiator and a peroxide initiator.
- the content of the binder polymer is preferably 1% by mass to 40% by mass, more preferably 3% by mass to 30% by mass, and more preferably 4% by mass. More preferably, it is 20 mass% or less.
- Adhesion improver In the photosensitive resin composition of the present invention, an adhesion improver can be added to improve adhesion to a hard surface such as a substrate.
- the adhesion improver include a silane coupling agent and a titanium coupling agent.
- silane coupling agents include ⁇ - (2-aminoethyl) aminopropyltrimethoxysilane, ⁇ - (2-aminoethyl) aminopropyldimethoxysilane, and ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxy.
- Silane ⁇ -aminopropyltrimethoxysilane, ⁇ -aminopropyltriethoxysilane, ⁇ -methacryloxypropyltrimethoxysilane, ⁇ -methacryloxypropyltriethoxysilane, ⁇ -acryloxypropyltrimethoxysilane, ⁇ -acryloxypropyl Triethoxysilane, ⁇ -isocyanatopropyltrimethoxysilane, ⁇ -isocyanatopropyltriethoxysilane, N- ⁇ - (N-vinylbenzylaminoethyl) - ⁇ -aminopropyltrimethoxysilane hydrochloride, ⁇ -glycidoxyp Propyltrimethoxysilane, ⁇ -glycidoxypropyltriethoxysilane, aminosilane, ⁇ -mercaptopropyltrimethoxysilane, ⁇ -mercaptopropyltrie
- ⁇ -methacryloxypropyltrimethoxysilane, ⁇ -methacryloxypropyltriethoxysilane, ⁇ -acryloxypropyltrimethoxysilane, ⁇ -acryloxypropyltriethoxysilane, ⁇ -mercaptopropyltrimethoxysilane, ⁇ -aminopropyl Triethoxysilane and phenyltrimethoxysilane are preferred, and ⁇ -methacryloxypropyltrimethoxysilane is most preferred.
- the addition amount of the adhesion improver is preferably 0.5% by mass or more and 30% by mass or less, and more preferably 0.7% by mass or more and 20% by mass or less in the total solid content of the photosensitive resin composition.
- plasticizers and sensitizers may be added to the photosensitive resin composition in order to improve the physical properties of the cured film.
- plasticizers include dioctyl phthalate, didodecyl phthalate, triethylene glycol dicaprylate, dimethyl glycol phthalate, tricresyl phosphate, dioctyl adipate, dibutyl sebacate, and triacetyl glycerin.
- the addition amount of the plasticizer can be 10% by mass or less based on the total mass of the polymerizable compound and the binder polymer.
- the photosensitive resin composition of this invention contains at least 1 sort (s) of the compound represented by the following general formula (I) which is a conjugated diene type compound as an ultraviolet absorber.
- this conjugated diene compound by using this conjugated diene compound, for example, it suppresses subsequent development performance fluctuation especially when performing low-illuminance exposure, so that pattern formability such as pattern line width, film thickness, spectral spectrum, etc. Dependence on exposure illuminance related to can be suppressed.
- R 1 and R 2 each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms, and R 1 and R 2 May be the same as or different from each other, but do not represent a hydrogen atom at the same time.
- the alkyl group having 1 to 20 carbon atoms represented by R 1 and R 2 is, for example, a methyl group, an ethyl group, a propyl group, an n-butyl group, an n-hexyl group, a cyclohexyl group, or n-decyl.
- the alkyl group represented by R 1 and R 2 may have a substituent, and examples of the substituent of the alkyl group having a substituent include an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an acyloxy group, Halogen atom, acylamino group, acyl group, alkylthio group, arylthio group, hydroxy group, cyano group, alkyloxycarbonyl group, aryloxycarbonyl group, substituted carbamoyl group, substituted sulfamoyl group, nitro group, substituted amino group, alkylsulfonyl group, An arylsulfonyl group etc. are mentioned.
- the aryl group having 6 to 20 carbon atoms represented by R 1 and R 2 may be a single ring or a condensed ring, and is any of a substituted aryl group having a substituent or an unsubstituted aryl group. There may be. Examples thereof include a phenyl group, a 1-naphthyl group, a 2-naphthyl group, an anthryl group, a phenanthryl group, an indenyl group, an acenaphthenyl group, a fluorenyl group, and the like.
- Examples of the substituent of the substituted aryl group having a substituent include an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an acyloxy group, a halogen atom, an acylamino group, an acyl group, an alkylthio group, an arylthio group, a hydroxy group, and a cyano group.
- R 1 and R 2 may form a cyclic amino group together with the nitrogen atom to which R 1 and R 2 are bonded.
- the cyclic amino group include piperidino group, morpholino group, pyrrolidino group, hexahydroazepino group, piperazino group and the like.
- R 1 and R 2 are each a lower alkyl group having 1 to 8 carbon atoms (eg, methyl, ethyl, isopropyl, butyl, sec-butyl, tert-butyl, pentyl, tert-pentyl, hexyl, octyl) , 2-ethylhexyl, tert-octyl, etc.) or a substituted or unsubstituted phenyl group (for example, tolyl group, phenyl group, anisyl group, mesityl group, chlorophenyl group, 2,4-di-tert-amylphenyl group, etc.) Is preferred. It is also preferred that R 1 and R 2 are combined to form a ring (for example, a piperidine ring, a pyrrolidine ring, a morpholine ring) containing the nitrogen atom represented by N in the formula.
- a ring for
- R 3 and R 4 represent an electron withdrawing group.
- the electron-withdrawing group is an electron-withdrawing group having a Hammett's substituent constant ⁇ p value (hereinafter simply referred to as “ ⁇ p value”) of 0.20 or more and 1.0 or less.
- ⁇ p value a Hammett's substituent constant
- ⁇ p value a Hammett's substituent constant
- it is an electron withdrawing group having a ⁇ p value of 0.30 or more and 0.8 or less.
- Hammett's rule is an empirical rule proposed by LP Hammett in 1935 to quantitatively discuss the effect of substituents on the reaction or equilibrium of benzene derivatives, which is widely accepted today. .
- Substituent constants obtained by Hammett's rule include a ⁇ p value and a ⁇ m value, and these values are described in many general books. For example, the JA Dean edition “Lange's Handbook of Chemistry” “Twelfth edition, 1979 (Mc Graw-Hill)", “Chemical domain special issue", 122, 96-103, 1979 (Nanedo), Chemical Reviews, 91, 165-195, 1991 detailed. In the present invention, it does not mean that the values known in the literature described in these documents are limited to only certain substituents, but within the range when measured based on Hammett's law even if the value is unknown. Of course, it is included as long as it is included.
- the electron-withdrawing group having a ⁇ p value of 0.20 or more and 1.0 or less include an acyl group, an acyloxy group, a carbamoyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, a cyano group, a nitro group, Dialkylphosphono group, diarylphosphono group, diarylphosphinyl group, alkylsulfinyl group, arylsulfinyl group, alkylsulfonyl group, arylsulfonyl group, sulfonyloxy group, acylthio group, sulfamoyl group, thiocyanate group, thiocarbonyl group, at least An alkyl group substituted with two or more halogen atoms, an alkoxy group substituted with at least two halogen atoms, an aryloxy group substituted with at least two halogen atoms, or at least
- an acyl group, a carbamoyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, a cyano group, a nitro group, an alkylsulfonyl group, an arylsulfonyl group, a sulfonyloxy group, and a sulfamoyl group are preferable.
- an acyl group, a carbamoyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, a cyano group, an alkylsulfonyl group, an arylsulfonyl group, a sulfonyloxy group, and a sulfamoyl group are preferable.
- R 3 is preferably a cyano group, a group selected from —COOR 5 , —CONHR 5 , —COR 5 , —SO 2 R 5 , and R 4 is cyano.
- R 5 and R 6 each independently represents an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms.
- the alkyl group having 1 to 20 carbon atoms and the aryl group having 6 to 20 carbon atoms represented by R 5 and R 6 have the same meanings as those in the above R 1 and R 2 , and the preferred embodiments are also the same.
- R 3 and R 4 may be bonded to each other to form a ring.
- R 1 , R 2 , R 3 , and R 4 may be in the form of a polymer derived from a monomer bonded to a vinyl group via a linking group. It may be a copolymer with another monomer.
- other monomers include acrylic acid, ⁇ -chloroacrylic acid, ⁇ -alacrylic acid (for example, esters derived from acrylic acids such as methacrylic acid, preferably lower alkyl esters and amides such as Acrylamide, methacrylamide, t-butyl acrylamide, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, n-hexyl acrylate, octyl methacrylate , Lauryl methacrylate, methylenebisacrylamide, etc.), vinyl esters (eg, vinyl acetate, vinyl propionate, vinyl laurate, etc.), acrylonitrile, methacryloni Tolyl, aromatic vinyl compounds (for example, styrene and its derivatives such as vinyl toluen
- acrylic acid esters methacrylic acid esters, and aromatic vinyl compounds are particularly preferable.
- Two or more of the other monomer compounds can be used together.
- n-butyl acrylate and divinylbenzene, styrene and methyl methacrylate, methyl acrylate and methacrylate acid, or the like can be used in combination.
- the ultraviolet absorbers represented by the general formula (I) used in the present invention are disclosed in JP-B-44-29620, JP-A-53-128333, JP-A-61-169831, JP-A-63-53543, It can be synthesized by the methods described in Japanese Laid-Open Patent Publication Nos. 63-53544 and 63-56651, and a pamphlet of WO2009 / 123109. Specifically, the exemplified compound (1) can be synthesized by the method described in paragraph No. 0040 of WO2009 / 123109 pamphlet.
- the content of the ultraviolet absorber (conjugated diene compound) represented by the general formula (I) in the photosensitive resin composition of the present invention is from 0.01% by mass to the total solid content of the composition. 30% by mass is preferable, 0.01% by mass to 20% by mass is more preferable, and 0.01% by mass to 15% by mass is particularly preferable.
- the content of the ultraviolet absorber is 0.01% by mass or more, the light shielding ability at the time of exposure is good, and it is easy to obtain a desired pattern by preventing pattern thickening due to excessive progress of polymerization. More suppressed. Moreover, superposition
- the photosensitive resin composition of the present invention is excellent in resolution and can form a pattern having a high refractive index and a high transmittance, it is very suitably used for forming, for example, a microlens and a microlens array. be able to.
- microlens Forming Method using the photosensitive resin composition of the present invention is not particularly limited, and a commonly used method can be applied. Among these, a formation method including at least the following steps (a) to (d) is preferable.
- A The process of forming the coating film of the photosensitive resin composition of this invention on a board
- B A step of irradiating at least a part of the coating film with radiation.
- C A step of developing the coated film after irradiation.
- D A step of heating the coated film after development.
- Step (a) the photosensitive resin composition is preferably applied as a liquid composition to the substrate surface, and the solvent is removed by pre-baking to form a coating film on the substrate.
- the substrate include a glass substrate, a silicon wafer, a substrate on which various metal layers are formed, a substrate on which an on-chip color filter for an image sensor is applied, and the like.
- the coating method is not particularly limited, and for example, an appropriate method such as a spray method, a roll coating method, a spin coating method, or a bar coating method can be employed.
- the pre-baking conditions vary depending on the type and amount of each component used, but are usually 60 to 120 ° C. for about 30 seconds to 15 minutes.
- the film thickness of the coating film to be formed is preferably about 0.5 to 20 ⁇ m as a value after pre-baking.
- radiation is applied to at least a part of the formed coating film.
- a mask having a predetermined pattern As radiation to be irradiated, for example, ultraviolet rays such as g-rays and i-rays, far ultraviolet rays such as KrF excimer lasers and ArF excimer lasers, X-rays such as synchrotron radiation, charged particle beams such as electron beams, etc. may be used. Of these, ultraviolet rays are preferred.
- the exposure amount can be appropriately selected according to the composition of the photosensitive resin composition, but is preferably about 50 to 2,000 J / m 2 .
- the exposed coating film is developed with a developer, preferably an alkali developer, and a pattern having a predetermined shape is formed by removing the unirradiated portion of the radiation.
- a developer preferably an alkali developer
- the alkali developer include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, ammonia, ethylamine, n-propylamine, diethylamine, diethylaminoethanol, di-n-propylamine, triethylamine.
- Methyldiethylamine dimethylethanolamine, triethanolamine, tetramethylammonium hydroxide, tetraethylammonium hydroxide, pyrrole, piperidine, 1,8-diazabicyclo [5.4.0] -7-undecene, 1,5-diazabicyclo [ 4.3.0] -5-nonene and the like.
- a water-soluble organic solvent such as methanol and ethanol, a surfactant, and various organic solvents can be added to the alkali developer.
- a developing method an appropriate method such as a liquid piling method, a dipping method, a rocking dipping method, a shower method or the like can be employed.
- After developing with an alkali developing solution it is usually washed, for example, with running water.
- the development time varies depending on the composition of the photosensitive resin composition and the composition of the developer, but is usually about 30 to 120 seconds at room temperature.
- the coating film after development is heated (post-baked) with a heating device such as a hot plate or oven to cure the coating film.
- a heating device such as a hot plate or oven to cure the coating film.
- the heating temperature is usually 120 to 250 ° C., preferably 160 to 230 ° C.
- the heating time varies depending on the heating means, it is usually about 5 to 30 minutes when heated on a hot plate, and is usually about 30 to 90 minutes when heated in an oven.
- a step baking method in which heating is performed twice or more can be adopted.
- a pattern corresponding to the target microlens can be formed on the substrate.
- a high-definition microlens and a microlens array having excellent characteristics for example, high refractive index and high transparency
- the microlens in the present invention is formed from the photosensitive resin composition of the present invention, has an excellent balance of characteristics, and is a liquid crystal display element such as various OA devices, liquid crystal televisions, mobile phones, projectors, etc. It can be used very suitably for an imaging optical system of an on-chip color filter such as a facsimile, an electronic copying machine, a solid-state image sensor, an optical fiber connector, and the like.
- the solid-state image sensor of the present invention comprises what constitutes an optical member formed using the photosensitive resin composition of the present invention.
- the optical member include a microlens, a waveguide, an antireflection film, and a transparent pixel used as a part of a color filter.
- These optical members may be a coating film using the photosensitive resin composition of the present invention, or may be a transparent pattern obtained by processing the composition by photochemical reaction or dry etching.
- the transparent pattern is not particularly limited as long as it constitutes a solid-state imaging device, but is preferably used as a transparent pattern processed by a photochemical reaction, and is preferably used as a microlens.
- Example 1 Preparation of Titanium Dioxide Dispersion (Dispersion Composition) Dispersed as follows using an Ultra Apex Mill (trade name) manufactured by Kotobuki Industries Co., Ltd. as a circulation type dispersion device (bead mill) for a mixture of the following composition The treatment was performed to obtain a titanium dioxide dispersion as a dispersion composition.
- Composition Titanium dioxide (manufactured by Ishihara Sangyo Co., Ltd., trade name: TTO-51 (C): 150 parts, the following specific resin 1: 40 parts, propylene glycol monomethyl ether acetate: 250 parts
- the dispersing device was operated under the following conditions. ⁇ Bead diameter: ⁇ 0.05mm ⁇ Bead filling rate: 75% by volume ⁇ Peripheral speed: 8m / sec ⁇ Pump supply amount: 10Kg / hour ⁇ Cooling water: Tap water ⁇ Bead mill annular passage volume: 0.15L ⁇ Amount of liquid mixture to be dispersed: 0.44 kg
- the average particle size was measured at 30 minute intervals (one pass time). The average particle diameter decreased with the dispersion time (pass number), but the amount of change gradually decreased. Dispersion was terminated when the average particle size change when the dispersion time was extended by 30 minutes became 5 nm or less. The average particle size of the titanium dioxide particles in this dispersion was 40 nm.
- the average particle diameter of the titanium dioxide in a present Example uses the dynamic light-scattering method about the dilution liquid obtained by diluting the liquid mixture or dispersion liquid containing titanium dioxide 80 times with propylene glycol monomethyl ether acetate. It means the value obtained by measuring.
- This measurement is the number average particle diameter obtained by using Microtrack UPA-EX150 manufactured by Nikkiso Co., Ltd.
- the projected area of the titanium dioxide particles was determined using a transmission electron microscope, and the arithmetic mean value of the corresponding equivalent circle diameters. was 40 nm.
- the photosensitive resin composition obtained above was applied onto a silicon wafer by spin coating, and then heated on a hot plate at 100 ° C. for 2 minutes to obtain a photosensitive layer (coating film). .
- the resulting photosensitive layer was exposed through a mask with five types of dot array patterns having different sizes from 0.5 micron square to 2 micron square using an i-line stepper.
- the exposed photosensitive layer was subjected to paddle development at 23 ° C. for 60 seconds using a 0.3% aqueous solution of tetramethylammonium hydroxide. Then, it rinsed with the spin shower, and also washed with pure water, and obtained the transparent pattern with a film thickness of 1.0 micrometer.
- the shape of the obtained transparent pattern was observed at 30000 times from above the silicon wafer using a length measuring SEM (trade name: S-7800H, manufactured by Hitachi, Ltd.).
- the minimum size of the obtained dot pattern is shown in Table 1 as the resolution.
- Table 1 also shows the case where a residue was observed around the pattern as x and the case where no residue was observed as ⁇ .
- the photosensitive resin composition obtained above was applied on a glass substrate by a spin coating method, and then heated at 100 ° C. for 2 minutes on a hot plate to obtain a transparent pattern. .
- the transmittance of the transparent pattern was measured on the substrate on which the transparent pattern was formed using a spectrophotometer U-4100 (trade name, manufactured by Hitachi, Ltd.).
- the photosensitive resin composition obtained above was applied onto a silicon wafer and then heated on a hot plate at 100 ° C. for 2 minutes to obtain a transparent pattern.
- the refractive index of the transparent pattern was measured on the substrate on which the transparent pattern was formed, using an ellipsometry VUV-VASE (trade name) manufactured by JA Woollam Japan. The results are shown in Table 1.
- Examples 2 to 22 and Comparative Examples 1 to 3 In the preparation of the titanium dioxide dispersion liquid of Example 1, titanium dioxide dispersion liquids were prepared using the specific resins shown in Table 1 instead of the specific resin 1. Further, using the obtained titanium dioxide dispersion, a photosensitive resin composition was prepared in the same manner as in Example 1 except that the type of polymerization initiator and the amount of added UV absorber were changed as shown in Table 1. . Further, using the obtained photosensitive resin composition, transparent patterns were respectively produced in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table 1.
- Example 23 A photosensitive resin composition was prepared in the same manner as in Example 1 except that titanium dioxide was replaced with the following in the preparation of the titanium dioxide dispersion of Example 1. Titanium dioxide (Ishihara Sangyo Co., Ltd., trade name: TTO-55 (C)) When the projected area of the titanium dioxide particles was determined using a transmission electron microscope, the arithmetic average value of the corresponding equivalent circle diameter was 60 nm. Using the obtained photosensitive resin composition, transparent patterns were respectively produced in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table 1.
- the photosensitive resin composition of the present invention has high resolution and exhibits excellent pattern formability with suppressed generation of residues. Moreover, it turns out that the transparent pattern formed using the photosensitive resin composition of this invention has a high transmittance
- Table 1 the structure of the specific resin in Table 1 is shown below.
- Table 2 shows the composition ratio (% by mass), the weight average molecular weight, and the like of each structural unit in the following structural formula.
- Example 101 the photosensitive resin composition was produced like Example 1 except having changed the composition of the photosensitive resin composition as follows. Further, using the obtained photosensitive resin composition, transparent patterns were respectively produced in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table 3.
- Examples 102-109 In the preparation of the photosensitive resin composition of Example 101, a photosensitive resin composition was prepared in the same manner as in Example 101 except that the compound shown in Table 3 was used instead of the compound (III) as the ultraviolet absorber. Prepared. Further, using the obtained photosensitive resin composition, transparent patterns were respectively produced in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table 3.
- Example 101 Comparative Examples 101-102
- Solpers 5000 (trade name, manufactured by Nippon Lubrizol Co., Ltd., phthalocyanine derivative), DISPER BYK180 (trade name, manufactured by BYK Chemie) instead of the specific resin 1 used for the preparation of the titanium dioxide dispersion liquid
- a photosensitive resin composition was prepared in the same manner as in Example 101 except that a titanium dioxide dispersion was prepared using an alkyl group ammonium salt of an acid group-containing copolymer.
- transparent patterns were respectively produced in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table 3.
- the photosensitive resin composition of the present invention has high resolution and exhibits excellent pattern forming properties in which the generation of residues is suppressed. Moreover, it turns out that the transparent pattern formed using the photosensitive resin composition of this invention has a high transmittance
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Abstract
Description
特に固体撮像素子に用いられるマイクロレンズは、固体撮像素子の微細化が進むとともに、より微細であることが求められるとともに、より効率的な集光を実現するために高屈折率が求められるようになってきた。また固体撮像素子作成の工程簡略化のため、カラーフィルター形成方法と同じネガ型でパターン形成可能なマイクロレンズ形成用感光性樹脂組成物が望まれている。
例えば、シリカ被覆酸化チタン粒子を用いた高屈折率のパターン形成性光重合組成物が開示されている(例えば、特開2009-179678号公報を参照)。また粒子表面のケイ素原子の割合が20%以上である金属酸化物を用いた固体撮像素子用組成物が開示されており高屈折率でパターン形成性の優れることが示されている(例えば、特開2008-185683号公報を参照)。
<1> 平均一次粒子径が1nm~100nmである二酸化チタン粒子(A)と、水素原子を除いた原子数が40~10000の範囲であるグラフト鎖を有するグラフト共重合体(B)と、溶媒(C)と、を含む分散組成物。
<2> 前記グラフト共重合体(B)におけるグラフト鎖が、ポリエステル構造、ポリエーテル構造、及びポリ(メタ)アクリル構造の群から選ばれた少なくとも1種である前記<1>に記載の分散組成物。
<3> 前記グラフト共重合体(B)が、少なくとも下記式(1)~式(5)のいずれかで表される構造単位を含むグラフト共重合体である前記<1>または<2>に記載の分散組成物:
<5> 前記グラフト共重合体(B)が、二酸化チタン粒子と相互作用を形成しうる官能基を有する構造単位をさらに含むグラフト共重合体である前記<1>~<4>のいずれか1項に記載の分散組成物。
<6> 前記グラフト共重合体(B)が、さらにカルボン酸基、スルホン酸基、及びリン酸基から選ばれる少なくとも1種を有するグラフト共重合体である前記<1>~<5>のいずれか1項に記載の分散組成物。
<8> バインダーポリマーをさらに含む前記<7>に記載の感光性樹脂組成物。
<9> 下記一般式(I)で表される紫外線吸収剤をさらに含む前記<7>または<8>に記載の感光性樹脂組成物:
<11> マイクロレンズ形成用途に使用される前記<7>~<10>のいずれか1項に記載の感光性樹脂組成物。
<13> 前記形成された透明パターンがマイクロレンズである前記<12>に記載の固体撮像素子。
また、前記グラフト共重合体を用いて得られた本発明の分散組成物を含む感光性樹脂組成物を塗布して塗膜を形成した場合にその塗布面の均一性に優れる。これは例えば、本発明のグラフト共重合体のグラフト鎖と溶媒とが良好な相互作用を行うためと推定される。
さらに、特に、前記特定の構造単位を含むグラフト共重合体とオキシム系開始剤とを合わせて用いることにより、さらに解像性の高いパターン形成が可能である。
本発明の分散組成物は、平均一次粒子径が1nm~100nmである二酸化チタン粒子(A)の少なくとも1種と、水素原子を除いた原子数が40~10000の範囲であるグラフト鎖を有するグラフト共重合体(B)の少なくとも1種と、溶媒(C)と、を含む。
かかる構成であることで、高屈折率かつ透過率が高い分散組成物を構成することができる。さらに本発明の分散組成物は、二酸化チタン粒子の分散性が高く、しかも二酸化チタン粒子の沈降が抑制され保存安定性に優れる。
本発明において使用される二酸化チタン粒子(以下、単に「二酸化チタン」ということがある)としては、平均一次粒子径(以下、単に「一次粒子径」ということがある)が1nmから100nmであれば特に制限はなく、例えば、市販の二酸化チタン粒子から適宜選択して用いることができる。
前記二酸化チタン粒子の一次粒子径は1nmから100nmであるが、1nmから80nmであることが好ましく、1nmから50nmであることが特に好ましい。二酸化チタン粒子の一次粒子径が100nmを超えると屈折率および透過率が低下することがある。また1nm未満の場合には、凝集により分散性が低下する場合がある。
二酸化チタン粒子の平均一次粒子径は、分散した二酸化チタン粒子を透過型電子顕微鏡により観察し、得られた写真から求めることができる。具体的には、二酸化チタン粒子の投影面積を求め、それに対応する円相当径の平均を二酸化チタン粒子の平均一次粒子径とする。尚、本発明における一次粒子径は、300個の二酸化チタン粒子について求めた円相当径の算術平均値とする。
また本発明においては、一次粒子径の指標として平均粒子径を用いることもできる。すなわち、本発明における二酸化チタン粒子の平均一次粒子径としては、二酸化チタンを含む混合液又は分散液を、プロピレングリコールモノメチルエーテルアセテートで80倍に希釈し、得られた希釈液について動的光散乱法を用いて測定することにより得られた値を採用してもよい。この測定は、日機装株式会社製マイクロトラック(商品名)UPA-EX150を用いて行って得られた数平均粒子径のこととする。
また二酸化チタン微粒子の比表面積は、10m2/gから400m2/gであることが好ましく、20m2/gから200m2/gであることがさらに好ましく、30m2/gから150m2/gであることが最も好ましい。
また前記二酸化チタン粒子の形状には特に制限はない。前記二酸化チタン粒子は、例えば、米粒状、球形状、立方体状、紡錘形状あるいは不定形状であることができる。
表面処理は、1種単独の表面処理剤でも、2種類以上の表面処理剤を組み合わせて実施してもよい。
また二酸化チタン粒子の表面が、アルミニウム、ケイ素、ジルコニアなどの酸化物により覆われていることもまた好ましい。これにより、より耐候性が向上する。
本発明において前記二酸化チタンは、1種単独でも、2種以上を組み合わせて用いてもよい。
また本発明の感光性樹脂組成物を構成した場合、感光性樹脂組成物中の二酸化チタン含有率は、感光性組成物全体に対して0.5質量%から90質量%、より好ましくは1質量%から80質量%、最も好ましくは2質量%から70質量%である。
本発明の分散組成物は、グラフト共重合体(以下、「特定樹脂」ともいう)の少なくとも1種を含むものである。本発明のグラフト共重合体は、水素原子を除いた原子数が40~10000の範囲であるグラフト鎖を少なくとも1種有している。この場合のグラフト鎖とは、共重合体の主鎖の根元から、主鎖から枝分かれしている基の末端までを示す。分散組成物において、この特定樹脂は、二酸化チタン粒子に分散性を付与する分散樹脂であり、優れた分散性、及びグラフト鎖による溶媒との親和性を有するために、二酸化チタンの分散性、及び、経時後の分散安定性に優れる。また、感光性樹脂組成物としたとき、グラフト鎖が重合性化合物もしくはその他の併用可能な樹脂などとの親和性を有するので、アルカリ現像で残渣を生じにくくなる。
グラフト鎖1本あたりの水素原子を除いた原子数が40未満では、グラフト鎖が短いため、立体反発効果が小さくなり分散性が低下する場合がある。一方、グラフト鎖1本あたりの水素原子を除いた原子数が10000を超えると、グラフト鎖が長くなりすぎ、二酸化チタンへの吸着力が低下して分散性が低下する場合がある。
尚、グラフト鎖1本あたりの水素原子を除いた原子数とは、主鎖を構成する高分子鎖に結合している根元の原子から、主鎖から枝分かれしている枝ポリマーの末端までに含まれる水素原子以外の原子の数である。
またグラフト共重合体にグラフト鎖が2種以上含まれる場合、少なくとも1種のグラフト鎖の水素原子を除いた原子数が上記要件を満たしていればよい。
特に、本発明の好ましい態様である式(1)~式(5)のいずれか1つで表される構造単位を含むグラフト共重合体を感光性樹脂組成物に用いた場合には、グラフト鎖の親水性がさらに向上する。これによりグラフト共重合体の現像性がさらに向上し、優れた分散性と現像での残渣低減が高い次元で両立できる。
式(1)~式(5)において、Y1、Y2、Y3、Y4、及びY5は、それぞれ独立に2価の連結基であり、特に構造上制約されない。具体的には、下記の(Y-1)~(Y-20)の連結基などが挙げられる。下記構造において、Aは、式(1)~式(5)におけるY1、Y2、Y3、Y4、又はY5の左末端基との結合を意味し、Bは、式(1)~式(5)におけるY1、Y2、Y3、Y4、又はY5の右末端基との結合を意味する。下記に示した構造のうち、合成の簡便性から、(Y-2)、(Y-13)であることがより好ましい。
前記式(1)~式(5)において、n、m、p、q、及びrは、それぞれ1~500の整数であり、好ましくは、3~100の整数であり、さらに好ましくは、5~50の整数である。
式(1)および式(2)において、jおよびkは、それぞれ独立に、2~8の整数を表す。式(1)および式(2)におけるjおよびkは、それぞれ独立に、分散安定性、現像性の観点から、4~6の整数が好ましく、5が最も好ましい。
また、式(5)中のRとしては特定樹脂中に構造の異なるRが2種以上含まれていても良い。
また、前記式(2)で表される構造単位としては、分散安定性、現像性の観点から、下記式(2A)で表される構造単位であることがより好ましい。
式(2A)中、X2、Y2、Z2及びmは、式(2)におけるX2、Y2、Z2及びmと同義であり、好ましい範囲も同様である。
またこのような酸基を導入することで、特定樹脂のアルカリ現像性をさらに向上させるという利点をも有する。
本発明における特定樹脂に好適に使用されるこれら酸基を有する構造単位を形成する共重合成分の含有率は、0.1モル%以上50モル%以下であり、特に好ましくは、アルカリ現像によるパターン強度のダメージ抑制という観点から、1モル%以上30モル%以下である。
本発明における特定樹脂に好適に使用されるこれら塩基性基を有する構造単位を形成する共重合成分の含有率は、0.01モル%以上50モル%以下であり、特に好ましくは、現像性阻害抑制という観点から、0.01モル%以上30モル%以下である。
また本発明における特定樹脂に好適に使用されるこれらの構造単位を構成する共重合成分の含有量は、0.5モル%以上50モル%以下であり、特に好ましくは、現像性阻害抑制という観点から、1モル%以上30モル%以下である。
R1、R2、及びR3は、より好ましくは水素原子、又は炭素原子数が1~3のアルキル基であり、最も好ましくは、水素原子又はメチル基である。R2、及びR3は、水素原子であることが特に好ましい。
Xは、酸素原子(-O-)又はイミノ基(-NH-)を表し、酸素原子であることが好ましい。
また、上記一般式(ii)で表される単量体として、R1が水素原子又はメチル基であって、Lがアルキレン基であって、Zがカルボン酸基であって、Yがメチン基である化合物が好ましい。また、上記一般式(iii)で表される単量体として、R4、R5、及びR6が水素原子又はメチル基であって、Zがカルボン酸基である化合物が好ましい。
本発明の分散組成物には、二酸化チタン粒子の分散性を調整する等の目的で、上記特定樹脂以外の樹脂(以下、「その他の樹脂」と称する場合がある)が含有されていてもよい。
本発明に用いることができるその他の樹脂としては、高分子分散剤〔例えば、ポリアミドアミンとその塩、ポリカルボン酸とその塩、高分子量不飽和酸エステル、変性ポリウレタン、変性ポリエステル、変性ポリ(メタ)アクリレート、(メタ)アクリル系共重合体、ナフタレンスルホン酸ホルマリン縮合物〕、及び、ポリオキシエチレンアルキルリン酸エステル、ポリオキシエチレンアルキルアミン、アルカノールアミン、顔料誘導体等を挙げることができる。
その他の樹脂は、その構造から更に直鎖状高分子、末端変性型高分子、グラフト型高分子、ブロック型高分子に分類することができる。
一方で、その他の樹脂は顔料表面を改質することで、分散樹脂の吸着を促進させる効果を有する。
これらのその他の樹脂は、単独で使用してもよく、2種以上を組み合わせて使用してもよい。
本発明の分散組成物は溶媒を含むが、該溶媒は種々の有機溶剤を用いて構成することができる。
ここで使用できる有機溶剤としては、アセトン、メチルエチルケトン、シクロヘキサン、酢酸エチル、エチレンジクロライド、テトラヒドロフラン、トルエン、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールジメチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、アセチルアセトン、シクロヘキサノン、ジアセトンアルコール、エチレングリコールモノメチルエーテルアセテート、エチレングリコールエチルエーテルアセテート、エチレングリコールモノイソプロピルエーテル、エチレングリコールモノブチルエーテルアセテート、3-メトキシプロパノール、メトキシメトキシエタノール、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールジメチルエーテル、ジエチレングリコールジエチルエーテル、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート、3-メトキシプロピルアセテート、N,N-ジメチルホルムアミド、ジメチルスルホキシド、γ-ブチロラクトン、乳酸メチル、乳酸エチルなどがある。
これらの有機溶剤は、単独、あるいは2種以上を混合して使用することができる。本発明の分散組成物における有機溶剤に対する固形分の濃度は、2~60質量%であることが好ましい。
本発明の感光性樹脂組成物は、前記分散組成物の少なくとも1種と、重合性化合物(D)の少なくとも1種と、重合開始剤の少なくとも1種とを含み、必要に応じてその他の成分を含む。
感光性樹脂組成物が前記分散組成物を含むことにより、優れた解像性が得られ、高屈折率で高透過率の透明パターンを形成することができる。
本発明における(D)重合性化合物は、少なくとも1個のエチレン性不飽和二重結合を有する付加重合性化合物であり、末端エチレン性不飽和結合を少なくとも1個、好ましくは2個以上有する化合物から選ばれる。このような化合物は当該技術分野において広く知られるものであり、本発明においてはこれらを特に限定無く用いることができる。
これらは、例えばモノマー、プレポリマー、すなわち2量体、3量体及びオリゴマー、又はそれらの混合物並びにそれらの共重合体などの化学的形態をもつ。モノマー及びその共重合体の例としては、不飽和カルボン酸(例えば、アクリル酸、メタクリル酸、イタコン酸、クロトン酸、イソクロトン酸、マレイン酸など)や、そのエステル類、アミド類が挙げられ、好ましくは、不飽和カルボン酸と脂肪族多価アルコール化合物とのエステル、不飽和カルボン酸と脂肪族多価アミン化合物とのアミド類が用いられる。また、ヒドロキシル基やアミノ基、メルカプト基等の求核性置換基を有する不飽和カルボン酸エステル類あるいは不飽和カルボン酸アミド類と、単官能若しくは多官能イソシアネート類あるいは単官能若しくは多官能エポキシ類との付加反応物;及び上記不飽和カルボン酸エステル類あるいは不飽和カルボン酸アミド類と、単官能若しくは多官能のカルボン酸との脱水縮合反応物等も好適に使用される。また、イソシアネート基や、エポキシ基等の親電子性置換基を有する不飽和カルボン酸エステル類あるいは不飽和カルボン酸アミド類と、単官能若しくは多官能のアルコール類、アミン類、チオール類との付加反応物;更にハロゲン基や、トシルオキシ基等の脱離性置換基を有する不飽和カルボン酸エステル類あるいは不飽和カルボン酸アミド類と、単官能若しくは多官能のアルコール類、アミン類、チオール類との置換反応物も好適である。また、別の例として、上記の不飽和カルボン酸を不飽和ホスホン酸、スチレン、又はビニルエーテル等に置き換えて得られた化合物群を使用することも可能である。
クロトン酸エステルとしては、エチレングリコールジクロトネート、テトラメチレングリコールジクロトネート、ペンタエリスリトールジクロトネート、ソルビトールテトラジクロトネート等が挙げられ;
イソクロトン酸エステルとしては、エチレングリコールジイソクロトネート、ペンタエリスリトールジイソクロトネート、ソルビトールテトライソクロトネート等が挙げられ;
マレイン酸エステルとしては、エチレングリコールジマレート、トリエチレングリコールジマレート、ペンタエリスリトールジマレート、ソルビトールテトラマレート等が挙げられる。
その他の好ましいアミド系モノマーの例としては、特公昭54-21726号公報記載のシクロへキシレン構造を有すモノマーを挙げることができる。
下記式(V)中、R7及びR8はそれぞれ独立して、水素原子又はメチル基を示す。
感度の点では、上記重合性化合物は、1分子あたりの不飽和基含量が多い構造を有することが好ましく、多くの場合、2官能以上が好ましい。また、硬化膜の強度を高くするためには、3官能以上のものがよく、更に、異なる官能数及び/又は異なる重合性基(例えばアクリル酸エステル、メタクリル酸エステル、スチレン系化合物、ビニルエーテル系化合物)のものを併用することで、感度と強度の両方を調節する方法も有効である。
また、感光性樹脂組成物に含有される他の成分(例えば、重合開始剤、二酸化チタン等の遮光材(顔料、染料)等)との相溶性、分散性に対しても、重合性化合物の選択及び/又は使用法は重要な要因であり、例えば、低純度化合物の使用や、2種以上の他の成分の併用により相溶性を向上させうることがある。また、基板などの硬質表面との密着性を向上させる目的で特定の構造を選択することもあり得る。
この範囲内であると、屈折率を低下させることなく、密着感度及び現像性が共に良好で好ましい。
本発明の感光性樹脂組成物は、さらに重合開始剤を含有することが、さらなる感度向上の観点から好ましい。
本発明における重合開始剤としては、以下に述べる重合開始剤として知られているものを用いることができる。
前記重合開始剤としては、前記重合性化合物の重合を開始する能力を有する限り、特に制限はなく、公知の重合開始剤の中から適宜選択することができる。例えば、紫外線領域から可視の光線に対して感光性を有するものが好ましい。また、光励起された増感剤と何らかの作用を生じ、活性ラジカルを生成する活性剤であってもよく、モノマーの種類に応じてカチオン重合を開始させるような開始剤であってもよい。
また、前記重合開始剤は、約300nm~800nm(330nm~500nmがより好ましい。)の範囲内に少なくとも約50の分子吸光係数を有する化合物を、少なくとも1種含有していることが好ましい。
ヒドロキシアセトフェノン系開始剤としては、IRGACURE-184、DAROCUR-1173、IRGACURE-500、IRGACURE-2959,IRGACURE-127(商品名:いずれもチバジャパン社製)を用いることができる。アミノアセトフェノン系開始剤としては、市販品であるIRGACURE-907、IRGACURE-369、及び、IRGACURE-379(商品名:いずれもチバジャパン社製)を用いることができる。アミノアセトフェノン系開始剤として、365nmまたは405nm等の長波光源に吸収波長がマッチングされた特開2009-191179公報に記載の化合物も用いることができる。また、アシルホスフィン系開始剤としては市販品であるIRGACURE-819やDAROCUR-TPO(商品名:いずれもチバジャパン社製)を用いることができる。
市販品ではIRGACURE-OXE01(チバジャパン社製)、IRGACURE-OXE02(チバジャパン社製)も好適に用いられる。
また、オキシム化合物の特定部位に不飽和結合を有する特開2009-242469号公報に記載の化合物も、重合不活性ラジカルから活性ラジカルを再生することで高感度化を達成でき好適に使用することができる。
具体的には、オキシム系重合開始剤としては、下記式(OX-1)で表される化合物が好ましい。なお、オキシムのN-O結合が(E)体のオキシム化合物であっても、(Z)体のオキシム化合物であっても、(E)体と(Z)体との混合物であってもよい。
前記式(OX-1)中、Rで表される一価の置換基としては、一価の非金属原子団であることが好ましい。
前記一価の非金属原子団としては、アルキル基、アリール基、アシル基、アルコキシカルボニル基、アリールオキシカルボニル基、複素環基、アルキルチオカルボニル基、アリールチオカルボニル基等が挙げられる。また、これらの基は、1以上の置換基を有していてもよい。また、前述した置換基は、さらに他の置換基で置換されていてもよい。
置換基としてはハロゲン原子、アリールオキシ基、アルコキシカルボニル基又はアリールオキシカルボニル基、アシルオキシ基、アシル基、アルキル基、アリール基等が挙げられる。
具体的には、チエニル基、ベンゾ[b]チエニル基、ナフト[2,3-b]チエニル基、チアントレニル基、フリル基、ピラニル基、イソベンゾフラニル基、クロメニル基、キサンテニル基、フェノキサチイニル基、2H-ピロリル基、ピロリル基、イミダゾリル基、ピラゾリル基、ピリジル基、ピラジニル基、ピリミジニル基、ピリダジニル基、インドリジニル基、イソインドリル基、3H-インドリル基、インドリル基、1H-インダゾリル基、プリニル基、4H-キノリジニル基、イソキノリル基、キノリル基、フタラジニル基、ナフチリジニル基、キノキサリニル基、キナゾリニル基、シンノリニル基、プテリジニル基、4aH-カルバゾリル基、カルバゾリル基、β-カルボリニル基、フェナントリジニル基、アクリジニル基、ペリミジニル基、フェナントロリニル基、フェナジニル基、フェナルサジニル基、イソチアゾリル基、フェノチアジニル基、イソキサゾリル基、フラザニル基、フェノキサジニル基、イソクロマニル基、クロマニル基、ピロリジニル基、ピロリニル基、イミダゾリジニル基、イミダゾリニル基、ピラゾリジニル基、ピラゾリニル基、ピペリジル基、ピペラジニル基、インドリニル基、イソインドリニル基、キヌクリジニル基、モルホリニル基、及び、チオキサントリル基が例示できる。
下記の構造中、Y、X、及び、nは、それぞれ、後述する式(OX-2)におけるY、X、及び、nと同義であり、好ましい例も同様である。
中でも、式(OX-1)におけるAとしては、感度を高め、加熱経時による着色を抑制する点から、無置換のアルキレン基、アルキル基(例えば、メチル基、エチル基、tert-ブチル基、ドデシル基)で置換されたアルキレン基、アルケニル基(例えば、ビニル基、アリル基)で置換されたアルキレン基、アリール基(例えば、フェニル基、p-トリル基、キシリル基、クメニル基、ナフチル基、アンスリル基、フェナントリル基、スチリル基)で置換されたアルキレン基が好ましい。
なかでも、感度を高め、加熱経時による着色を抑制する点から、置換又は無置換のフェニル基が好ましい。
式(OX-2)におけるR、A、及びArは、前記式(OX-1)におけるR、A、及びArと同義であり、好ましい例も同様である。
また、式(2)におけるnは、0~5の整数を表し、0~2の整数が好ましい。
式(OX-3)におけるR、X、A、Ar、及び、nは、前記式(OX-2)におけるR、X、A、Ar、及び、nとそれぞれ同義であり、好ましい例も同様である。
化合物のモル吸光係数は、公知の方法を用いることができるが、具体的には、例えば、紫外可視分光光度計(Varian社製Carry-5 spctrophotometer)にて、酢酸エチル溶媒を用い、0.01g/Lの濃度で測定することが好ましい。
増感剤
本発明の感光性樹脂組成物は、(E)重合開始剤のラジカル発生効率の向上、感光波長の長波長化の目的で、増感剤を含有していてもよい。
本発明に用いることができる増感剤としては、前記した(E)重合開始剤に対し、電子移動機構又はエネルギー移動機構で増感させるものが好ましい。
即ち、例えば、多核芳香族類(例えば、フェナントレン、アントラセン、ピレン、ペリレン、トリフェニレン、9,10-ジアルコキシアントラセン)、キサンテン類(例えば、フルオレッセイン、エオシン、エリスロシン、ローダミンB、ローズベンガル)、チオキサントン類(イソプロピルチオキサントン、ジエチルチオキサントン、クロロチオキサントン)、シアニン類(例えば、チアカルボシアニン、オキサカルボシアニン)、メロシアニン類(例えば、メロシアニン、カルボメロシアニン)、フタロシアニン類、チアジン類(例えば、チオニン、メチレンブルー、トルイジンブルー)、アクリジン類(例えば、アクリジンオレンジ、クロロフラビン、アクリフラビン)、アントラキノン類(例えば、アントラキノン)、スクアリリウム類(例えば、スクアリリウム)、アクリジンオレンジ、クマリン類(例えば、7-ジエチルアミノ-4-メチルクマリン)、ケトクマリン、フェノチアジン類、フェナジン類、スチリルベンゼン類、アゾ化合物、ジフェニルメタン、トリフェニルメタン、ジスチリルベンゼン類、カルバゾール類、ポルフィリン、スピロ化合物、キナクリドン、インジゴ、スチリル、ピリリウム化合物、ピロメテン化合物、ピラゾロトリアゾール化合物、ベンゾチアゾール化合物、バルビツール酸誘導体、チオバルビツール酸誘導体、アセトフェノン、ベンゾフェノン、チオキサントン、ミヒラーズケトンなどの芳香族ケトン化合物、N-アリールオキサゾリジノンなどのヘテロ環化合物などが挙げられる。
増感剤は、1種単独で用いてもよいし、2種以上を併用してもよい。
これらは1種単独で用いてもよいし、2種以上を併用してもよい。
なお、本明細書においては、化学式は簡略構造式により記載することもあり、特に元素や置換基の明示がない実線等は、炭化水素基を表す。
本発明の感光性樹脂組成物は、更に共増感剤を含有することも好ましい。
本発明において共増感剤は、(E)重合開始剤や増感剤の活性放射線に対する感度を一層向上させる、あるいは、酸素による(D)重合性化合物の重合阻害を抑制する等の作用を有する。
本発明においては、感光性樹脂組成物の製造中あるいは保存中において重合可能なエチレン性不飽和二重結合を有する化合物の不要な重合を阻止するために、重合禁止剤を添加することが好ましい。
本発明に用いうる重合禁止剤としては、水酸基含有フェノール化合物、N-オキシド化合物類、ピペリジン1-オキシルフリーラジカル化合物類、ピロリジン1-オキシルフリーラジカル化合物類、N-ニトロソフェニルヒドロキシルアミン類、ジアゾニウム化合物類、及びカチオン染料類、スルフィド基含有化合物類、ニトロ基含有化合物類、FeCl3、CuCl2等の遷移金属化合物類が挙げられる。
水酸基含有フェノール化合物が、ハイドロキノン、p-メトキシフェノール、ジ-t-ブチル-p-クレゾール、ピロガロール、t-ブチルカテコール、ベンゾキノン、4,4-チオビス(3-メチル-6-t-ブチルフェノール)、2,2'-メチレンビス(4-メチル-6-t-ブチルフェノール)、フェノール樹脂類、及びクレゾール樹脂類からなる群より選択される化合物であるのが好ましい。
上記範囲とすることで、非画像部における硬化反応抑制及び画像部における硬化反応促進が充分おこなわれ、画像形成性及び感度が良好となる。
本発明の感光性樹脂組成物は、解像性及び皮膜特性向上などの観点から、さらにバインダーポリマーの少なくとも1種を含むことが好ましい。
前記バインダーポリマーとしては線状有機ポリマーを用いることが好ましい。このような線状有機ポリマーとしては、公知のものを任意に使用できる。好ましくは水現像あるいは弱アルカリ水現像を可能とするために、水あるいは弱アルカリ水に可溶性又は膨潤性である線状有機ポリマーが選択される。線状有機ポリマーは、皮膜形成剤としてだけでなく、水、弱アルカリ水あるいは有機溶剤現像剤としての用途に応じて選択使用される。例えば、水可溶性有機ポリマーを用いると水現像が可能になる。このような線状有機ポリマーとしては、側鎖にカルボン酸基を有するラジカル重合体、例えば特開昭59-44615号公報、特公昭54-34327号公報、特公昭58-12577号公報、特公昭54-25957号公報、特開昭54-92723号公報公報、特開昭59-53836号公報、特開昭59-71048号公報に記載されているもの、すなわち、カルボキシル基を有するモノマーを単独あるいは共重合させた樹脂、酸無水物を有するモノマーを単独あるいは共重合させ酸無水物ユニットを加水分解若しくはハーフエステル化若しくはハーフアミド化させた樹脂、エポキシ樹脂を不飽和モノカルボン酸及び酸無水物で変性させたエポキシアクリレート等が挙げられる。カルボキシル基を有するモノマーとしては、アクリル酸、メタクリル酸、イタコン酸、クロトン酸、マレイン酸、フマル酸、4-カルボキシルスチレン等があげられ、酸無水物を有するモノマーとしては、無水マレイン酸等が挙げられる。
また、同様に側鎖にカルボン酸基を有する酸性セルロース誘導体がある。この他に水酸基を有する重合体に環状酸無水物を付加させたものなどが有用である。
(2)アクリル酸メチル、アクリル酸エチル、アクリル酸プロピル、アクリル酸ブチル、アクリル酸イソブチル、アクリル酸アミル、アクリル酸ヘキシル、アクリル酸2-エチルヘキシル、アクリル酸オクチル、アクリル酸ベンジル、アクリル酸-2-クロロエチル、グリシジルアクリレート、3,4-エポキシシクロヘキシルメチルアクリレート、ビニルアクリレート、2-フェニルビニルアクリレート、1-プロペニルアクリレート、アリルアクリレート、2-アリロキシエチルアクリレート、プロパルギルアクリレート等のアルキルアクリレート。
(4)アクリルアミド、メタクリルアミド、N-メチロールアクリルアミド、N-エチルアクリルアミド、N-ヘキシルメタクリルアミド、N-シクロヘキシルアクリルアミド、N-ヒドロキシエチルアクリルアミド、N-フェニルアクリルアミド、N-ニトロフェニルアクリルアミド、N-エチル-N-フェニルアクリルアミド、ビニルアクリルアミド、ビニルメタクリルアミド、N,N-ジアリルアクリルアミド、N,N-ジアリルメタクリルアミド、アリルアクリルアミド、アリルメタクリルアミド等のアクリルアミド若しくはメタクリルアミド。
(6)ビニルアセテート、ビニルクロロアセテート、ビニルブチレート、安息香酸ビニル等のビニルエステル類。
(7)スチレン、α-メチルスチレン、メチルスチレン、クロロメチルスチレン、p-アセトキシスチレン等のスチレン類。
(8)メチルビニルケトン、エチルビニルケトン、プロピルビニルケトン、フェニルビニルケトン等のビニルケトン類。
(9)エチレン、プロピレン、イソブチレン、ブタジエン、イソプレン等のオレフィン類。
(11)マレイミド、N-アクリロイルアクリルアミド、N-アセチルメタクリルアミド、N-プロピオニルメタクリルアミド、N-(p-クロロベンゾイル)メタクリルアミド等の不飽和イミド。
(12)α位にヘテロ原子が結合したメタクリル酸系モノマー。例えば、特開2002-309057号、特開2002-311569号等の各公報に記載の化合物を挙げる事ができる。
また、欧州特許第993966号、欧州特許第1204000号、特開2001-318463号公報等に記載の酸基を有するアセタール変性ポリビニルアルコール系バインダーポリマーは、膜強度、現像性のバランスに優れており、好適である。
更にこの他に水溶性線状有機ポリマーとして、ポリビニルピロリドンやポリエチレンオキサイド等が有用である。また硬化皮膜の強度を上げるためにアルコール可溶性ナイロンや2,2-ビス-(4-ヒドロキシフェニル)-プロパンとエピクロロヒドリンのポリエーテル等も有用である。
これらのバインダーポリマーは、ランダムポリマー、ブロックポリマー、グラフトポリマー等いずれでもよい。
本発明の感光性樹脂組成物において用いうるバインダーポリマーを合成する際に用いられるラジカル重合開始剤としては、アゾ系開始剤、過酸化物開始剤等公知の化合物が挙げられる。
本発明の感光性樹脂組成物においては、基板などの硬質表面との密着性を向上させるために、密着向上剤を添加することができる。密着向上剤としては、シラン系カップリング剤、チタンカップリング剤等が挙げられる。
更に、感光性樹脂組成物に対しては、硬化皮膜の物性を改良するために可塑剤や感脂化剤等の公知の添加剤を加えてもよい。
可塑剤としては、例えば、ジオクチルフタレート、ジドデシルフタレート、トリエチレングリコールジカプリレート、ジメチルグリコールフタレート、トリクレジルホスフェート、ジオクチルアジペート、ジブチルセバケート、トリアセチルグリセリン等があり、結合剤を使用した場合、可塑剤の添加量は、重合性化合物とバインダーポリマーとの合計質量に対し10質量%以下とすることができる。
本発明の感光性樹脂組成物は、紫外線吸収剤として、共役ジエン系化合物である下記一般式(I)で表される化合物の少なくとも1種を含有する。本発明においては、この共役ジエン系化合物を用いることで、例えば、特に低照度露光を行なった際のその後の現像性能変動を抑えるので、パターンの線幅、膜厚、分光スペクトル等のパターン形成性に関係する露光照度依存性を抑制することができる。
R1及びR2で表されるアルキル基は置換基を有していてもよく、置換基を有するアルキル基の置換基としては、アルキル基、アリール基、アルコキシ基、アリールオキシ基、アシルオキシ基、ハロゲン原子、アシルアミノ基、アシル基、アルキルチオ基、アリールチオ基、ヒドロキシ基、シアノ基、アルキルオキシカルボニル基、アリールオキシカルボニル基、置換カルバモイル基、置換スルファモイル基、ニトロ基、置換アミノ基、アルキルスルホニル基、アリールスルホニル基等が挙げられる。
ハメット則は、ベンゼン誘導体の反応又は平衡に及ぼす置換基の影響を定量的に論ずるために、1935年にL. P. Hammettにより提唱された経験則であるが、これは今日広く妥当性が認められている。ハメット則により求められた置換基定数には、σp値とσm値とがあり、これらの値は多くの一般的な成書に記載があるが、例えば、J.A. Dean編「Lange’s Handbook of Chemistry」第12版、1979年(Mc Graw-Hill)や「化学の領域増刊」、122号、96~103頁、1979年(南江堂)、Chemical Reviews, 91巻、165頁~195頁、1991年に詳しい。本発明では、これらの成書に記載の文献既知の値がある置換基にのみ限定されるという意味ではなく、その値が文献未知であってもハメット則に基づいて測定した場合にその範囲内に含まれる限り包含されることは勿論である。
上記のうち、本発明においては、R3としては、シアノ基、-COOR5、-CONHR5、-COR5、-SO2R5より選択される基が好ましく、また、R4としては、シアノ基、-COOR6、-CONHR6、-COR6、-SO2R6より選択される基が好ましい。R5及びR6は、各々独立に、炭素原子数1~20のアルキル基、又は炭素原子数6~20のアリール基を表す。R5及びR6で表される炭素原子数1~20のアルキル基、炭素原子数6~20のアリール基は、前記R1及びR2における場合と同義であり、好ましい態様も同様である。
また、R3及びR4は互いに結合して環を形成してもよい。
このうち特にアクリル酸エステル、メタアクリル酸エステル、芳香族ビニル化合物が好ましい。
上記他のモノマー化合物の2種以上を一緒に併用することも出来る。例えば、n-ブチルアクリレートとジビニルベンゼン、スチレンとメチルメタアクリレート、メチルアクリレートとメタアクリレート酸等を併用できる。
本発明の感光性樹脂組成物は、解像性に優れ、高屈折率で高透過率なパターンを形成可能であるため、例えば、マイクロレンズ及びマイクロレンズアレイの形成に極めて好適に使用することができる。
本発明の感光性樹脂組成物を用いたマイクロレンズの形成方法には、特に制限はなく通常用いられる方法を適用することができる。中でも、少なくとも以下の(イ)~(ニ)の工程を含む形成方法であることが好ましい。
(ロ)該塗膜の少なくとも一部に放射線を照射する工程。
(ハ)照射後の塗膜を現像する工程。
(ニ)現像後の塗膜を加熱する工程。
(イ)工程
この工程においては、感光性樹脂組成物を、好ましくは液状組成物として、基板表面に塗布し、プレベークを行うことにより溶媒を除去して、基板上に塗膜を形成する。
前記基板としては、例えば、ガラス基板、シリコンウエハーや、これらの表面に各種金属層が形成された基板、イメージセンサー用オンチップカラーフィルターが塗布された基板等を挙げることができる。
塗布方法としては、特に限定されるものではなく、例えば、スプレー法、ロールコート法、回転塗布法、バー塗布法等の適宜の方法を採用することができる。
プリベークの条件としては、各成分の種類や使用量等によっても異なるが、通常、60~120℃で30秒~15分間程度である。形成される塗膜の膜厚は、プレベーク後の値として、0.5~20μm程度が好ましい。
この工程においては、形成された塗膜の少なくとも一部に放射線を照射する。
塗膜の一部のみに放射線を照射する際には、所定のパターンを有するマスクを介して照射する。
照射する放射線としては、例えば、g線、i線等の紫外線、KrFエキシマレーザー、ArFエキシマレーザー等の遠紫外線、シンクロトロン放射線等のX線、電子線等の荷電粒子線等を使用することができるが、これらのうち紫外線が好ましい。
露光量は、感光性樹脂組成物の構成等に応じて適宜選択できるが、50~2,000J/m2程度が好ましい。
この工程においては、露光後の塗膜を現像液、好ましくはアルカリ現像液により現像して、放射線の未照射部分を除去することにより、所定形状のパターンを形成させる。
前記アルカリ現像液としては、例えば、水酸化ナトリウム、水酸化カリウム、炭酸ナトリウム、ケイ酸ナトリウム、メタケイ酸ナトリウム、アンモニア、エチルアミン、n-プロピルアミン、ジエチルアミン、ジエチルアミノエタノール、ジ-n-プロピルアミン、トリエチルアミン、メチルジエチルアミン、ジメチルエタノールアミン、トリエタノールアミン、テトラメチルアンモニウムヒドロキシド、テトラエチルアンモニウムヒドロキシド、ピロール、ピペリジン、1,8-ジアザビシクロ[5.4.0]-7-ウンデセン、1,5-ジアザビシクロ [4.3.0]-5-ノネン等の水溶液を挙げることができる。また、アルカリ現像液には、メタノール、エタノール等の水溶性有機溶媒、界面活性剤や各種有機溶媒を添加して使用することができる。
現像方法としては、液盛り法、ディッピング法、揺動浸漬法、シャワー法等の適宜の方法を採用することができる。なお、アルカリ現像液で現像したのちは、通常、例えば流水洗浄等により洗浄する。
現像時間は、感光性樹脂組成物の構成、現像液の構成によって異なるが、通常、常温で30~120秒間程度である。
この工程においては、現像後の塗膜を、ホットプレート、オーブン等の加熱装置により加熱(ポストベーク)することにより、当該塗膜を硬化させる。
このポストベークにおいて、加熱温度は、通常、120~250℃、好ましくは160~230℃である。また加熱時間は、加熱手段により異なるが、ホットプレート上で加熱する場合、通常5~30分間程度であり、オーブン中で加熱する場合、通常、30~90分間程度である。
また、ポストベークに際しては、2回以上加熱するステップベーク法等を採用することもできる。
本発明のマイクロレンズの形成方法によると、優れた特性(例えば、高屈折率と高透過性)を有する高精細なマイクロレンズおよびマイクロレンズアレイを高い製品歩留りで簡便に形成することができる。
本発明の固体撮像素子は、本発明の感光性樹脂組成物を用いて形成された光学部材を構成するものを備える。光学部材としては、例えば、マイクロレンズ、導波路、反射防止膜、カラーフィルタの一部として用いられる透明画素等が挙げられる。これらの光学部材は、本発明の感光性樹脂組成物を用いた塗膜であってもよいし、当該組成物を光化学反応やドライエッチングによって加工処理した透明パターンであってもよい。前記透明パターンとしては、固体撮像素子を構成するものであれば特に制限はないが、光化学反応によって加工された透明パターンとして用いるのが好ましく、マイクロレンズとして用いるのが好ましい。
二酸化チタン分散液(分散組成物)の調製
下記組成の混合液に対し、循環型分散装置(ビーズミル)として、寿工業株式会社製ウルトラアペックスミル(商品名)を用いて、以下のようにして分散処理を行い、分散組成物として二酸化チタン分散液を得た。
組成
・二酸化チタン(石原産業(株)製、商品名:TTO-51(C) : 150部
・下記特定樹脂1 : 40部
・プロピレングリコールモノメチルエーテルアセテート : 250部
・ビーズ径:φ0.05mm
・ビーズ充填率:75体積%
・周速:8m/sec
・ポンプ供給量:10Kg/hour
・冷却水:水道水
・ビーズミル環状通路内容積:0.15L
・分散処理する混合液量:0.44Kg
平均粒子径は分散時間(パス回数)とともに減少していったが、次第にその変化量が少なくなっていった。分散時間を30分間延長したときの平均粒子径変化が5nm以下となった時点で分散を終了した。尚、この分散液中の二酸化チタン粒子の平均粒子径は40nmであった。
尚、本実施例における二酸化チタンの平均粒子径は、二酸化チタンを含む混合液又は分散液を、プロピレングリコールモノメチルエーテルアセテートで80倍に希釈し、得られた希釈液について動的光散乱法を用いて測定することにより得られた値のことを言う。この測定は、日機装株式会社製マイクロトラックUPA-EX150を用いて行って得られた数平均粒子径のこととする。
また、上記測定とは別に、得られた分散液に含まれる二酸化チタン粒子の300個について、透過型電子顕微鏡を用いて二酸化チタン粒子の投影面積をそれぞれ求め、対応する円相当径の算術平均値を求めたところ、40nmであった。
上記で得られた二酸化チタン分散液(分散組成物)を用いて、以下の組成となるように各成分を混合して感光性樹脂組成物を得た。
感光性樹脂組成物の組成
・上記で調製した二酸化チタン分散液(分散組成物) … 10部
・ジペンタエリスリトールヘキサアクリレート … 8部
(重合性化合物、下記T-1)
・オキシム光重合開始剤 … 1部
(重合開始剤、下記K-1)
・バインダーポリマー … 5部
(下記J-1;重量平均分子量(Mw)及び共重合比(モル比)は下記の通りである。下記J-1は、特許第4142973号明細書に記載の製造方法に準じて合成した。)
・下記化合物(III)(紫外線吸収剤) … 1部
・プロピレングリコールモノメチルエーテルアセテート … 76部
上記で得られた感光性樹脂組成物をシリコンウエハ上にスピンコート法で塗布し、その後ホットプレート上で、100℃で2分間加熱して感光性層(塗膜)を得た。
次いで、得られた感光性層に対し、i線ステッパーを用い、0.5ミクロン四方から2ミクロン四方までのサイズが異なる5種のドットアレイパターンを、マスクを介して露光した。
前記露光後の感光性層に対し、テトラメチルアンモニウムハイドロオキサイド0.3%水溶液を用い、23℃で60秒間パドル現像を行った。その後、スピンシャワーにてリンスを行い、さらに純水にて水洗し、膜厚1.0μmの透明パターンを得た。
得られた透明パターンの形状を測長SEM(商品名:S-7800H、(株)日立製作所製)を用いてシリコンウエハー上から30000倍で観察した。得られたドットパターンの最小サイズを解像性として表1に示した。
また、パターン周辺に残渣が観察された場合を×、残渣が観察されなかった場合を○として同じく表1に示した。
上記で得られた感光性樹脂組成物をガラス基板上にスピンコート法で塗布し、その後ホットプレート上で100℃で2分間加熱して透明パターンを得た。
この透明パターンが形成された基板に対して、分光光度計U-4100(商品名、日立(株)製)を用いて、透明パターンの透過率測定を行った。
同様に上記で得られた感光性樹脂組成物をシリコンウエハ上に塗布し、その後ホットプレート上で100℃で2分間加熱して透明パターンを得た。この透明パターンが形成された基板に対して、ジェー・エー・ウーラム・ジャパン社製エリプソメトリーVUV-VASE(商品名)を用いて、透明パターンの屈折率を測定した。
それぞれの結果を表1に示した。
実施例1の二酸化チタン分散液の調製において、特定樹脂1の代わりに表1に示す特定樹脂を用いて、二酸化チタン分散液をそれぞれ調製した。
さらに得られた二酸化チタン分散液を用い、重合開始剤の種類と紫外線吸収剤添加量を表1に示したように変更した以外は実施例1と同様にして感光性樹脂組成物をそれぞれ調製した。
また得られた感光性樹脂組成物を用いて、実施例1と同様にして透明パターンをそれぞれ作製し、同様にして評価を行なった。結果を表1に示した。
実施例1の二酸化チタン分散液の調製において、二酸化チタンを以下のものに置き換えた以外は、実施例1と同様にして、感光性樹脂組成物を調整した。
二酸化チタン(石原産業(株)製、商品名:TTO-55(C))
なお、透過型電子顕微鏡を用いて二酸化チタン粒子の投影面積を求めたところ、対応する円相当径の算術平均値は60nmであった。
得られた感光性樹脂組成物を用いて、実施例1と同様にして透明パターンをそれぞれ作製し、同様にして評価を行なった。結果を表1に示した。
尚、以下に、表1中の特定樹脂の構造を示した。また下記構造式における各構成単位の組成比(質量%)、重量平均分子量等を表2に示した。
実施例1において、感光性樹脂組成物の組成を下記のように変更した以外は実施例1と同様にして感光性樹脂組成物を作製した。
また得られた感光性樹脂組成物を用いて、実施例1と同様にして透明パターンをそれぞれ作製し、同様にして評価を行なった。結果を表3に示した。
・実施例1で調製した二酸化チタン分散液 … 67部
・ジペンタエリスリトールヘキサアクリレート(T-1) … 3部
・オキシム系光重合開始剤(K-1) … 0.5部
・バインダーポリマー(J-1) … 3部
・化合物(III)(紫外線吸収剤) … 2部
・プロピレングリコールモノメチルエーテルアセテート … 24.5部
実施例101の感光性樹脂組成物の調製において、紫外線吸収剤として化合物(III)の代わりに、表3に示した化合物を用いたこと以外は実施例101と同様にして感光性樹脂組成物を調製した。
また得られた感光性樹脂組成物を用いて、実施例1と同様にして透明パターンをそれぞれ作製し、同様にして評価を行なった。結果を表3に示した。
実施例101において、二酸化チタン分散液の調製に用いた特定樹脂1の代わりに、ソルパース5000(商品名、日本ルーブリゾール社製、フタロシアニン誘導体)、DISPER BYK180(商品名、BYK Chemie(ビックケミー)社製、酸基を有する共重合物のアルキロールアンモニウム塩)をそれぞれ用いて二酸化チタン分散液を調製したこと以外は実施例101と同様にして、感光性樹脂組成物を調製した。
得られた感光性樹脂組成物を用いて、実施例1と同様にして透明パターンをそれぞれ作製し、同様にして評価を行なった。結果を表3に示した。
Claims (13)
- 平均一次粒子径が1nm~100nmである二酸化チタン粒子(A)と、水素原子を除いた原子数が40~10000の範囲であるグラフト鎖を有するグラフト共重合体(B)と、溶媒(C)と、を含む分散組成物。
- 前記グラフト共重合体(B)におけるグラフト鎖が、ポリエステル構造、ポリエーテル構造、及びポリ(メタ)アクリル構造の群から選ばれた少なくとも1種である請求項1に記載の分散組成物。
- 前記グラフト共重合体(B)が、少なくとも下記式(1)~式(5)のいずれかで表される構造単位を含むグラフト共重合体である請求項1または請求項2に記載の分散組成物:
式(1)~式(5)において、X1、X2、X3、X4、X5、及びX6は、それぞれ独立に、水素原子又は1価の有機基を表し;Y1、Y2、Y3、Y4、及びY5は、それぞれ独立に、2価の連結基を表し;Z1、Z2、Z3、Z4、及びZ5は、それぞれ独立に、水素原子又は1価の有機基を表す;Rは、水素原子又は1価の有機基を表し、共重合体中に構造の異なるRが存在していてもよい;n、m、p、q、及びrは、それぞれ1~500の整数を表す;j及びkはそれぞれ独立に2~8の整数を表す。 - 前記グラフト共重合体(B)が、前記式(1)~式(5)のいずれかで表される構造単位を、該グラフト共重合体の総質量に対し質量換算で、10%~90%の範囲で含むグラフト共重合体である請求項3に記載の分散組成物。
- 前記グラフト共重合体(B)が、二酸化チタン粒子と相互作用を形成しうる官能基を有する構造単位をさらに含むグラフト共重合体である請求項1~請求項4のいずれか1項に記載の分散組成物。
- 前記グラフト共重合体(B)が、さらにカルボン酸基、スルホン酸基、及びリン酸基から選ばれる少なくとも1種を有するグラフト共重合体である請求項1~請求項5のいずれか1項に記載の分散組成物。
- 請求項1~請求項6のいずれか1項に記載の分散組成物と、重合性化合物(D)と、重合開始剤(E)と、を含む感光性樹脂組成物。
- バインダーポリマーをさらに含む請求項7に記載の感光性樹脂組成物。
- 前記重合開始剤(E)が、オキシム系重合開始剤である請求項7~請求項9のいずれか1項に記載の感光性樹脂組成物。
- マイクロレンズ形成用途に使用される請求項7~請求項10のいずれか1項に記載の感光性樹脂組成物。
- 請求項7~請求項11のいずれか1項に記載の感光性樹脂組成物を用いて形成された透明パターンを備えた固体撮像素子。
- 前記形成された透明パターンがマイクロレンズである請求項12に記載の固体撮像素子。
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| US9442372B2 (en) | 2007-09-26 | 2016-09-13 | Fujifilm Corporation | Pigment dispersion composition, photocurable composition and color filter |
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- 2010-11-17 WO PCT/JP2010/070502 patent/WO2011062198A1/ja not_active Ceased
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2502963A4 (en) | 2016-02-24 |
| TW201125880A (en) | 2011-08-01 |
| JP2011127096A (ja) | 2011-06-30 |
| EP2502963A1 (en) | 2012-09-26 |
| JP5701576B2 (ja) | 2015-04-15 |
| US8908293B2 (en) | 2014-12-09 |
| US20120257283A1 (en) | 2012-10-11 |
| TWI494332B (zh) | 2015-08-01 |
| KR101754848B1 (ko) | 2017-07-06 |
| KR20130053383A (ko) | 2013-05-23 |
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