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WO2015141323A1 - Procédé de production d'une feuille adhésive, feuille adhésive, stratifié pour écran tactile et écran tactile capacitif - Google Patents

Procédé de production d'une feuille adhésive, feuille adhésive, stratifié pour écran tactile et écran tactile capacitif Download PDF

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Publication number
WO2015141323A1
WO2015141323A1 PCT/JP2015/053392 JP2015053392W WO2015141323A1 WO 2015141323 A1 WO2015141323 A1 WO 2015141323A1 JP 2015053392 W JP2015053392 W JP 2015053392W WO 2015141323 A1 WO2015141323 A1 WO 2015141323A1
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Prior art keywords
adhesive sheet
sensitive adhesive
pressure
mass
touch panel
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English (en)
Japanese (ja)
Inventor
洋平 石地
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Fujifilm Corp
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Fujifilm Corp
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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
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • 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
    • C08F2/00—Processes of polymerisation
    • C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
    • 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
    • C08F2/00—Processes of polymerisation
    • C08F2/46—Polymerisation initiated by wave energy or particle radiation
    • C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
    • C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
    • 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
    • C08F290/04—Polymers provided for in subclasses C08C or C08F
    • C08F290/048—Polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J151/04—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to rubbers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • 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
    • C08F220/00—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 a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/53—Phosphorus bound to oxygen bound to oxygen and to carbon only
    • C08K5/5397—Phosphine oxides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer

Definitions

  • the present invention relates to a method for producing an adhesive sheet, an adhesive sheet, a laminate for a touch panel, and a capacitive touch panel.
  • touch panels capacitive touch panels capable of detecting multiple points
  • a pressure-sensitive adhesive composition is used to bring the members such as a display device and a touch panel sensor into close contact with each other.
  • These compositions are often used after being formed into a sheet.
  • a method for producing an adhesive sheet using an acrylate monomer having an acryloyl group is specifically disclosed.
  • the pressure-sensitive adhesive sheet obtained from the curable pressure-sensitive adhesive composition is required to have various characteristics when used for a touch panel. For example, excellent adhesion is required from the viewpoint of durability of the touch panel. In addition, from the viewpoint of visibility, it is also required to exhibit excellent optical characteristics. Furthermore, it is also required that cohesive failure does not occur (not brittle) when the release film is attached and peeled off. That is, the pressure-sensitive adhesive sheet is required to exhibit excellent adhesion, excellent optical characteristics, and excellent peeling characteristics.
  • An object of this invention is to provide the manufacturing method of an adhesive sheet which can manufacture the thick adhesive sheet excellent in adhesiveness, an optical characteristic, peeling characteristics, and level
  • Another object of the present invention is to provide a pressure-sensitive adhesive sheet, a laminate for a touch panel including the pressure-sensitive adhesive sheet, and a capacitive touch panel.
  • the present inventors have found that the above problems can be solved by performing light irradiation at a predetermined illuminance using a curable pressure-sensitive adhesive composition containing a methacrylic monomer as a polymerizable monomer.
  • the headline, the present invention has been reached. That is, the present inventors have found that the above problem can be solved by the following configuration.
  • a curable pressure-sensitive adhesive composition comprising a methacrylate monomer having one methacryloyl group, a crosslinking agent having two or more radical polymerizable groups, a photopolymerization initiator, and a tackifier is applied on a substrate.
  • the curable pressure-sensitive adhesive composition has the thickness 200 ⁇ m or more precursor film formed by, the light irradiation at an illuminance 0.1 mW / cm 2 ultra 200 mW / cm less than 2, the process for manufacturing the pressure-sensitive adhesive sheet,
  • the mass ratio (b / a) of the content (b) of the methacrylate monomer and the content (a) of the photopolymerization initiator is 10.0 or more and less than 50.0
  • the content of the methacrylate monomer is 10 to 45% by mass with respect to the total mass of the curable adhesive composition
  • the ratio of the number of moles of oxygen atoms to the number of moles of carbon atoms (number of moles of oxygen atoms / number of moles of carbon atoms) contained in the curable pressure-sensitive adhesive composition is 0.10 or less, (1 The manufacturing method of the adhesive sheet of description. (3) Production of pressure-sensitive adhesive sheet according to (1) or (2), wherein the content of the photopolymerization initiator is 1.0 to 2.5% by mass relative to the total mass of the curable pressure-sensitive adhesive composition. Method.
  • the photopolymerization initiator includes at least one selected from the group consisting of a monoacylphosphine oxide photopolymerization initiator and a bisacylphosphine oxide photopolymerization initiator, and includes a hydroxyketone photopolymerization initiator.
  • the precursor film having a thickness of 200 ⁇ m or more formed by applying a curable pressure-sensitive adhesive composition having a tackifier content of 5.0 to 50.0% by mass on a substrate is irradiated with light.
  • a pressure-sensitive adhesive sheet obtained by carrying out The residual rate of the photopolymerization initiator is less than 10%, A pressure-sensitive adhesive sheet having a methacrylate monomer reaction rate of more than 80% and a gel fraction of 30% or more.
  • the adhesive sheet according to (7) or (8) which is an adhesive sheet for a touch panel.
  • a laminate for a touch panel comprising the pressure-sensitive adhesive sheet according to (9) and a capacitive touch panel sensor.
  • a protective substrate is provided,
  • a capacitive touch panel comprising the capacitive touch panel sensor, the adhesive sheet according to (9), and a display device in this order.
  • the manufacturing method of an adhesive sheet which can manufacture the thick adhesive sheet which is excellent in adhesiveness, an optical characteristic, peeling characteristics, and level
  • seat, an adhesive sheet, and a capacitive touch panel can also be provided.
  • FIG. 5 is a cross-sectional view taken along a cutting line AA shown in FIG. It is an enlarged plan view of a 1st detection electrode. It is a partial cross section of other embodiment of an electrostatic capacitance type touch panel sensor. It is a partial cross section of other embodiment of an electrostatic capacitance type touch panel sensor. It is a partial top view of other embodiment of an electrostatic capacitance type touch panel sensor.
  • FIG. 10 is a cross-sectional view taken along a cutting line AA shown in FIG. It is sectional drawing of the evaluation sample used by level
  • a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • polymerized by using the methacrylate monomer which has a methacryloyl group and performing light irradiation with predetermined illumination intensity is mentioned.
  • an acrylate monomer having an acryloyl group is used for production of the pressure-sensitive adhesive sheet in terms of more excellent reactivity.
  • the reactivity is too high, and thus the radical terminals in the oligomer react with each other in the coating film and are easily deactivated.
  • methacrylate monomers are less reactive than acrylate monomers. Therefore, the present inventors use a methacrylate monomer and perform light irradiation at a predetermined illuminance to sufficiently advance the polymerization in the coating film, thereby obtaining an adhesive sheet exhibiting desired characteristics. Heading.
  • the method for producing a pressure-sensitive adhesive sheet according to the present invention comprises subjecting a precursor film having a thickness of 200 ⁇ m or more formed by applying a curable pressure-sensitive adhesive composition containing a predetermined component onto a substrate, and irradiating with light under a predetermined condition. And carrying out a process for producing an adhesive sheet.
  • a curable pressure-sensitive adhesive composition containing a predetermined component onto a substrate, and irradiating with light under a predetermined condition.
  • a curable pressure-sensitive adhesive composition (hereinafter also simply referred to as “composition”) is a composition used to form the precursor film, and includes a methacrylate monomer having one methacryloyl group, and a radical polymerizable group. At least a crosslinking agent having two or more, a photopolymerization initiator, and a tackifier.
  • composition is a composition used to form the precursor film, and includes a methacrylate monomer having one methacryloyl group, and a radical polymerizable group.
  • At least a crosslinking agent having two or more, a photopolymerization initiator, and a tackifier At least a crosslinking agent having two or more, a photopolymerization initiator, and a tackifier.
  • the methacrylate monomer contained in the composition has one methacryloyl group (CH 2 ⁇ C (CH 3 ) —CO— *, where * indicates a bonding position) and is polymerized to form a polymethacrylate chain. Generate. Although the kind in particular of a methacrylate monomer is not restrict
  • Formula (1) CH 2 ⁇ C (CH 3 ) —COO—R
  • R represents a hydrocarbon group which may have a hetero atom.
  • the number of carbon atoms (carbon number) in the hydrocarbon group represented by R is preferably 6 or more in that the malfunction of the capacitive touch panel including the obtained adhesive sheet is further suppressed.
  • a carbon number of 8 to 12 is more preferable.
  • Preferred examples of the hydrocarbon group include an aliphatic hydrocarbon group, an aromatic hydrocarbon group, and a group obtained by combining these.
  • the aliphatic hydrocarbon group may be linear, branched, or cyclic, and more specifically, a linear aliphatic hydrocarbon group, a branched aliphatic hydrocarbon group, a cyclic aliphatic.
  • Examples include hydrocarbon groups (alicyclic hydrocarbon groups).
  • Examples of the aliphatic hydrocarbon group include an alkyl group, a cycloalkyl group, and an alkenyl group.
  • Examples of the aromatic hydrocarbon group include a phenyl group and a naphthyl group.
  • the solubility parameter (SP value) of the methacrylate monomer is not particularly limited, but is preferably 8.0 to 10.0 (MPa) 1/2 from the viewpoint of more excellent effects of the present invention.
  • the SP value is Michael M.M. Collman, John F. Graf, Paul C.M. "Specific Interactions and the Miscibility of Polymer Blends” (1991), Technological Publishing Co., by Painter (Pensylvania State Univ.). Inc. It is a value obtained by the calculation described in.
  • the methacrylate monomer examples include n-octyl methacrylate, isooctyl methacrylate, n-nonyl methacrylate, isononyl methacrylate, n-decyl methacrylate, isodecyl methacrylate, n-dodecyl methacrylate, n-tridecyl methacrylate, n- Examples include tetradecyl methacrylate, n-hexadecyl methacrylate, stearyl methacrylate, benzyl methacrylate, isobornyl methacrylate, dicyclopentenyl methacrylate, dicyclopentanyl methacrylate, dicyclopentenyloxyethyl methacrylate, and methacrylic acid.
  • methacrylate monomer only 1 type may be used or 2 or more types may be used together.
  • the methacrylate monomer may be a polar functional group-containing methacrylate monomer such as a carboxy group-containing methacrylate monomer, a hydroxy group-containing methacrylate, or a cyclic ether group-containing methacrylate monomer.
  • carboxy group-containing methacrylate monomer those having a methacryloyl group and having a carboxy group can be used without particular limitation.
  • the carboxy group-containing methacrylate monomer include carboxyethyl methacrylate and carboxypentyl methacrylate, which can be used alone or in combination.
  • a carboxy group-containing methacrylate monomer can be used as the methacrylate monomer, but on the other hand, the carboxy group-containing methacrylate monomer may not be used.
  • an adhesive sheet with reduced metal corrosion caused by the carboxy group can be formed.
  • hydroxy group-containing methacrylate monomer those having a methacryloyl group and having a hydroxy group can be used without particular limitation.
  • examples of the hydroxy group-containing methacrylate monomer include 2-hydroxybutyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 6-hydroxyhexyl methacrylate, 8-hydroxyoctyl methacrylate, 10-hydroxydecyl methacrylate, and 12-hydroxylauryl.
  • hydroxyalkyl methacrylates such as methacrylate; and hydroxyalkylcycloalkane methacrylates such as (4-hydroxymethylcyclohexyl) methyl methacrylate. These can be used alone or in combination. Of these, hydroxyalkyl methacrylate is preferred.
  • cyclic ether group-containing methacrylate monomer those having a methacryloyl group and a cyclic ether group such as an epoxy group or an oxetane group can be used without particular limitation.
  • the monomer having a methacryloyl group and having an epoxy group include glycidyl methacrylate, 3,4-epoxycyclohexylmethyl methacrylate, 4-hydroxybutyl methacrylate glycidyl ether, and the like.
  • Monomers having a methacryloyl group and having an oxetane group include, for example, 3-oxetanyl methyl methacrylate, 3-methyl-oxetanyl methyl methacrylate, 3-ethyl-oxetanyl methyl methacrylate, 3-buty Examples include leuoxetanyl methyl methacrylate, 3-hexyl oxetanyl methyl methacrylate, and the like. These can be used alone or in combination.
  • any one of the adhesiveness, optical properties, release properties, and step following properties of the obtained pressure-sensitive adhesive sheet is more excellent (hereinafter referred to as “the effect of the present invention is more excellent).
  • the monomer X in which R in the formula (1) is a branched aliphatic hydrocarbon group and the formula (1) More preferred is an embodiment in which the monomer R is used in combination with the monomer Y in which R is a cyclic aliphatic hydrocarbon group.
  • the content of the methacrylate monomer in the composition is 10 to 45% by mass with respect to the total mass of the composition, and is more preferably 15 to 30% by mass and more preferably 20 to 30% by mass in terms of more excellent effects of the present invention. Is more preferable.
  • the content of the methacrylate monomer is less than 10% by mass, a sufficiently crosslinked gel cannot be obtained, so that the adhesiveness is lowered and the peeling property is deteriorated.
  • the content of the methacrylate monomer exceeds 45% by mass, the crosslinking proceeds too much and the cured film becomes hard, and the adhesiveness is also lowered.
  • the content of methacrylate monomers means the total content of methacrylate monomers.
  • the acrylate monomer which has one acryloyl group is not substantially contained in a composition at the point which the effect of this invention is more excellent. “Substantially not contained” means that the content of the acrylate monomer is 1% by mass or less with respect to the total mass of the composition, preferably 0.1% by mass or less, and 0% by mass. It is more preferable that
  • a crosslinking agent intends the compound which has multiple (2 or more) radically polymerizable group, and plays the role which provides a crosslinked structure in the adhesive sheet formed.
  • the cross-linking agent only needs to have a plurality of radically polymerizable groups. However, it is preferable to have 2 to 6 radicals in view of more excellent effects of the present invention. Is more preferable.
  • the kind in particular of radically polymerizable group is not restrict
  • the (meth) acryloyl group is a concept including an acryloyl group and a methacryloyl group.
  • the type of the skeleton in the cross-linking agent is not particularly limited, but is preferably one selected from the group consisting of polybutadiene, polyisoprene, hydrogenated polybutadiene, and hydrogenated polyisoprene in that the effect of the present invention is more excellent.
  • the cross-linking agent is preferably one type selected from the group consisting of polybutadiene, polyisoprene, hydrogenated polybutadiene, and hydrogenated polyisoprene having a methacryloyl group.
  • the content of the crosslinking agent in the composition is not particularly limited, but is preferably 10 to 30% by mass and more preferably 15 to 25% by mass with respect to the total mass of the composition from the viewpoint that the effect of the present invention is more excellent.
  • the content of the crosslinking agent is preferably 50 to 100% by mass, more preferably 70 to 90% by mass, based on the total mass of the methacrylate monomer.
  • photoinitiator The kind in particular of photoinitiator is not restrict
  • alkynephenone photopolymerization initiator methoxyketone photopolymerization initiator, acylphosphine oxide photopolymerization initiator, hydroxyketone photopolymerization initiator (eg IRGACURE184; 1,2- ⁇ -hydroxyalkyl) Phenone), aminoketone photopolymerization initiator (eg, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one (IRGACURE® 907), oxime photopolymerization initiation Agents.
  • the photopolymerization initiator preferably includes at least one selected from the group consisting of monoacylphosphine oxide (A1) and bisacylphosphine oxide (A2).
  • the monoacylphosphine oxide (A1) is not particularly limited, and a known monoacylphosphine oxide can be used.
  • As a suitable aspect of monoacylphosphine oxide (A1) the monoacylphosphine oxide represented by a following formula (A1) is mentioned, for example.
  • R A11 represents a hydrocarbon group which may have a substituent. Although it does not restrict
  • the aliphatic hydrocarbon group may be linear, branched or cyclic. Specific examples of the aliphatic hydrocarbon group include a linear or branched alkyl group (particularly 1 to 20 carbon atoms), a linear or branched alkenyl group (particularly 2 to 20 carbon atoms), Examples thereof include a linear or branched alkynyl group (particularly, having 2 to 20 carbon atoms).
  • the aliphatic hydrocarbon group is preferably a linear or branched alkyl group.
  • the aromatic hydrocarbon group include an aryl group and a naphthyl group.
  • the aryl group include aryl groups having 6 to 18 carbon atoms such as a phenyl group, a tolyl group, and a xylyl group.
  • the substituent that the hydrocarbon group may have is not particularly limited, but specific examples include an aliphatic hydrocarbon group, an aromatic hydrocarbon group, a halogen atom (a fluorine atom, a chlorine atom, a bromine atom, etc.) and the like. Can be mentioned. Specific examples and preferred embodiments of the aliphatic hydrocarbon group and the aromatic hydrocarbon group are as described above.
  • the substituent is preferably an aliphatic hydrocarbon group.
  • R A12 and R A13 each independently represent a hydrocarbon group or a hydrocarbon oxy group (—OR: where R represents a hydrocarbon group) which may have a substituent.
  • R represents a hydrocarbon group
  • R represents a hydrocarbon group
  • Specific examples of the hydrocarbon group of the hydrocarbon group which may have a substituent and the hydrocarbon group (R) of the hydrocarbon oxy group are the same as the hydrocarbon group described above.
  • the specific example and suitable aspect of a substituent which a hydrocarbon group or a hydrocarbon oxy group may have are the same as the substituent mentioned above.
  • One of R A12 and R A13 is preferably an aromatic hydrocarbon group which may have a substituent.
  • R A12 and R A13 When one of R A12 and R A13 is an aromatic hydrocarbon group which may have a substituent, the other may have a phenyl group (especially having 6 to 18 carbon atoms) or an alkoxy group which may have a substituent ( Particularly preferred are those having 1 to 5 carbon atoms, and more preferred are phenyl groups (particularly 6 to 18 carbon atoms) which may have a substituent.
  • monoacylphosphine oxide (A1) examples include benzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2,3,5,6-tetramethylbenzoyl-diphenylphosphine oxide, 3, Examples include 4-dimethylbenzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoyl-phenylethoxyphosphine oxide, and the like.
  • the bisacylphosphine oxide (A2) is not particularly limited, and a known bisacylphosphine oxide can be used.
  • a suitable aspect of bisacylphosphine oxide (A2) the bisacylphosphine oxide represented by a following formula (A2) is mentioned, for example.
  • R A21 to R A23 each independently represents a hydrocarbon group which may have a substituent. Specific examples and preferred embodiments of the hydrocarbon group and the substituent are the same as those of R A11 described above.
  • bisacylphosphine oxide (A2) include bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide and bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide. And bis (2,6-dimethylbenzoyl) -ethylphosphine oxide.
  • the photopolymerization initiator preferably does not contain a hydroxyketone photopolymerization initiator.
  • the absence of a hydroxyketone photoinitiator means that the composition is substantially free of a hydroxyketone photoinitiator.
  • the term “substantially” means that the content of the hydroxyketone photopolymerization initiator is 0.1% by mass or less with respect to the total mass of the composition, and is preferably 0% by mass.
  • an aminoketone type photoinitiator is not contained.
  • the absence of the aminoketone photoinitiator means that the aminoketone photoinitiator is not substantially contained in the composition.
  • the term “substantially” means that the content of the aminoketone photopolymerization initiator is 0.1% by mass or less with respect to the total mass of the composition, and is preferably 0% by mass.
  • the content of the photopolymerization initiator in the composition is not particularly limited, but is preferably 1.0 to 2.5% by mass with respect to the total mass of the composition in terms of more excellent effects of the present invention. More preferably, it is -2.2 mass%. In addition, when 2 or more types of photoinitiators are used, it is preferable that the total content of a photoinitiator exists in the said range.
  • the mass ratio (b / a) of the content (b) of the methacrylate monomer in the composition to the content (a) of the photopolymerization initiator is 10.0 or more and less than 50.0, and the effect of the present invention is achieved. From the viewpoint of superiority, 10.0 to 30 is preferable, and 12 to 20 is more preferable. When the mass ratio (b / a) is less than 10.0, the optical properties of the obtained pressure-sensitive adhesive sheet are inferior, and when the mass ratio (b / a) is 50.0 or more, the adhesiveness or peeling property of the pressure-sensitive adhesive sheet is inferior. .
  • tackifier As the tackifier, those known in the field of patch or patch preparation may be appropriately selected and used.
  • tackifiers include tackifier resins, such as rosin resins such as rosin esters, hydrogenated rosin esters, disproportionated rosin esters, and polymerized rosin esters; coumarone indene resins, hydrogenated coumarone indene resins, Coumarone indene resins such as phenol-modified coumarone indene resin and epoxy-modified coumarone indene resin; ⁇ -pinene resin, ⁇ -pinene resin; polyterpene resin, hydrogenated terpene resin, aromatic modified terpene resin, terpene phenol resin, etc.
  • rosin resins such as rosin esters, hydrogenated rosin esters, disproportionated rosin esters, and polymerized rosin esters
  • coumarone indene resins hydrogenated coumarone indene resin
  • Terpene resin petroleum-based resins such as aliphatic petroleum resins, aromatic petroleum resins, and aromatic-modified aliphatic petroleum resins. These can be used alone or in combination of two or more, and rosin resins, terpene resins and coumarone indene resins are particularly preferable.
  • the content of the tackifier in the composition is 5.0 to 50.0% by mass with respect to the total mass of the composition, and 20 to 45% by mass is more preferable in that the effect of the present invention is more excellent. 20 to 40% by mass is more preferable.
  • the content of the tackifier is less than 5.0% by mass, the adhesiveness of the pressure-sensitive adhesive sheet is lowered, and when the content of the tackifier is more than 50.0% by mass, the step following property is lowered.
  • content of a tackifier intends the total content of a tackifier.
  • the composition may contain components other than the above-described components (methacrylate monomer, crosslinking agent, photopolymerization initiator, tackifier).
  • the composition may contain a plasticizer (softening component).
  • plasticizer softening component
  • the type of plasticizer is not particularly limited, but for example, natural rubber, polyisobutylene, polybutene, polyisoprene, polybutadiene, hydrogenated polyisoprene, hydrogenated polybutadiene, styrene butadiene rubber, or a combination arbitrarily selected from these groups A copolymer etc. are mentioned.
  • it is preferable that a radically polymerizable group is not contained in a plasticizer.
  • the content of the plasticizer in the composition is not particularly limited, but is preferably 5 to 25% by mass and more preferably 8 to 16% by mass with respect to the total mass of the composition in terms of more excellent effects of the present invention. In addition, when 2 or more types of plasticizers are used, it is preferable that the total content of the plasticizer is in the above range.
  • the composition may contain a polymerization inhibition inhibitor.
  • the polymerization inhibition inhibitor has a function of suppressing polymerization inhibition by oxygen.
  • Polymerization inhibition suppression is not particularly limited, and examples thereof include phosphites (eg, triphenyl phosphite), amines (eg, aniline, hindered amines, DBU (diazabicycloundecene)), thiols (eg, dodecane). Thiol, pentaerythritol tetra (3-mercaptopropionate) and the like.
  • the composition of the present invention may contain two or more polymerization inhibition inhibitors.
  • the composition preferably contains at least one polymerization inhibition inhibitor selected from the group consisting of phosphites, amines and thiols.
  • the content of the polymerization inhibition inhibitor in the composition is not particularly limited, but is preferably 0.1 to 10% by mass, more preferably 0.2 to 2.5% by mass with respect to the total mass of the composition. In addition, when 2 or more types of polymerization inhibition inhibitors are used, it is preferable that the total content of polymerization inhibition inhibitors is in the above range.
  • the composition may contain a monomer other than the methacrylate monomer.
  • a monomer other than the methacrylate monomer for example, a polar functional group-containing monomer selected from a carboxy group-containing monomer, a hydroxy group-containing monomer, a cyclic ether group-containing monomer, a nitrogen-containing monomer, etc. (however, excluding the above-mentioned methacrylate monomer) can be included.
  • carboxy group-containing monomer a monomer having a polymerizable functional group having an unsaturated double bond such as a vinyl group and having a carboxy group can be used without particular limitation.
  • hydroxy group-containing monomer those having a polymerizable functional group having an unsaturated double bond such as a vinyl group and having a hydroxy group can be used without particular limitation.
  • examples of the hydroxy group-containing monomer include hydroxyethyl (meth) acrylamide, allyl alcohol, 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, and the like. These can be used alone or in combination.
  • cyclic ether group-containing monomer a monomer having a polymerizable functional group having an unsaturated double bond such as a vinyl group and a cyclic ether group such as an epoxy group or an oxetane group can be used without particular limitation. it can.
  • nitrogen-containing monomer examples include, for example, N-hydroxyethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-ethoxymethyl (meth) acrylamide, and N-methoxyethyl.
  • examples include amide monomers such as (meth) acrylamide and N-ethoxyethyl (meth) acrylamide, and cyclic vinyl compounds such as N-vinylpyrrolidone, N-vinylcaprolactam, and N-cyclohexylmaleimide, N-vinylimidazole, and vinylpyridine. It is done.
  • These nitrogen-containing monomers can be used alone or in combination of two or more.
  • (meth) acrylamide is a concept including acrylamide and methacrylamide.
  • the composition may contain a solvent, if necessary.
  • a solvent for example, water, organic solvents (for example, alcohols such as methanol, ketones such as acetone, amides such as formamide, sulfoxides such as dimethyl sulfoxide, esters such as ethyl acetate, ethers, and the like. Etc.), or a mixed solvent thereof.
  • the composition includes surface lubricants, leveling agents, antioxidants, corrosion inhibitors, light stabilizers, UV absorbers, polymerization inhibitors, silane coupling agents, inorganic or organic fillers, metals It can be added as appropriate according to the use for which various conventionally known additives such as powders, powders such as pigments, particles, and foils are used.
  • the ratio of the number of moles of oxygen atoms to the number of moles of carbon atoms in the composition (number of moles of oxygen atoms / number of moles of carbon atoms) (hereinafter also referred to as “O / C ratio”) is 0.10 or less. It is preferably 0.005 to 0.05. If O / C ratio is in the said range, generation
  • the O / C ratio can be determined by calculating the number of moles of oxygen atoms and the number of moles of carbon atoms for each component in the composition. For example, if the composition contains a methacrylate monomer, a crosslinker, a photoinitiator, and a tackifier, the O / C ratio is [number of moles of oxygen atoms of methacrylate monomer + mol of oxygen atoms of crosslinker.
  • the method for preparing the composition is not particularly limited, and a known method can be adopted. For example, after mixing each said component, it can prepare by stirring by a well-known means.
  • the method for producing a pressure-sensitive adhesive sheet has a illuminance of more than 0.1 mW / cm 2 and less than 200 mW / cm 2 with respect to a precursor film having a thickness of 200 ⁇ m or more formed by applying the curable pressure-sensitive adhesive composition on a substrate. And performing a light irradiation to produce a pressure-sensitive adhesive sheet.
  • a so-called release film is mentioned preferably from the point which bonds an adhesive sheet to another member. Examples of the release film include a film whose surface is treated with a silicone-based release agent and other release agents, and a film that itself has release properties.
  • polyolefin such as a polypropylene and polyethylene
  • polyester such as a polypropylene
  • nylon such as polyvinyl chloride
  • a method of applying the composition onto the substrate a known method can be adopted, and examples thereof include a coating method using a gravure coater, comma coater, bar coater, knife coater, die coater, roll coater and the like.
  • the thickness of the precursor film (coating film) formed by the application is 200 ⁇ m or more, preferably 500 ⁇ m or less, and more preferably 300 ⁇ m or less from the viewpoint of easy formation of the coating film.
  • the drying treatment is not particularly limited, and examples thereof include a method of performing a heat treatment at a temperature at which the polymerization of the methacrylate monomer does not proceed (for example, 60 to 100 ° C.) and a method of performing an air drying treatment.
  • Illuminance of the light irradiation is performed on the precursor film obtained above is less than 0.1 mW / cm 2 ultra 200mW / cm 2, 0.1mW / cm 2 that is ultra 100 mW / cm 2 or less more preferably from 1 ⁇ 80mW / cm 2, more preferably 5 mW / cm 2 ultra 80 mW / cm 2 or less, particularly preferably 10 ⁇ 50mW / cm 2.
  • the illuminance is 0.1 mW / cm 2 or less, the curing of the composition does not proceed sufficiently, the adhesiveness of the pressure-sensitive adhesive sheet is inferior, and when the illuminance is 200 mW / cm 2 or more, the optical properties, adhesiveness and At least any one of peelability is inferior.
  • Examples of the light source for light irradiation include a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, a metal halide lamp, a Deep-UV light, a xenon lamp, a chemical lamp, and a carbon arc lamp.
  • UV irradiation is preferable as light irradiation at the point which the effect of this invention is more excellent.
  • Exposure amount in the irradiation is not particularly limited, in terms of properties and productivity of the balance of pressure-sensitive adhesive sheet obtained is preferably 2000 mJ / cm 2 or less, more preferably 1750mJ / cm 2 or less, 1500 mJ / cm 2 or less Is more preferable. Although a minimum in particular is not restrict
  • the pressure-sensitive adhesive sheet obtained by the above procedure is excellent in optical characteristics, adhesion, peeling characteristics, and step following ability.
  • the residual ratio of the photopolymerization initiator in the pressure-sensitive adhesive sheet obtained by the above procedure is less than 10%, and 5% or less is more preferable in that the optical properties of the pressure-sensitive adhesive sheet are more excellent.
  • the lower limit is not particularly limited, but 0% is preferable. When the said residual rate is 10% or more, the optical characteristic of an adhesive sheet is inferior.
  • the residual ratio (%) intends the residual ratio of the photopolymerization initiator contained in the composition in the pressure-sensitive adhesive sheet.
  • Liquid column chromatography is used as a method for measuring the residual ratio (%) of the photopolymerization initiator in the pressure-sensitive adhesive sheet. More specifically, the residual ratio of the photopolymerization initiator is determined by measuring the same amount (30 mg) of the composition and the pressure-sensitive adhesive sheet obtained from the composition, and measuring each with a predetermined solvent (10 g) at room temperature.
  • the solvent whose solubility of a photoinitiator is 1 mass% or more is used as a predetermined
  • the solubility (mass%) is intended to mean an amount in which the photopolymerization initiator is uniformly dissolved in the solvent.
  • the solubility (Mass%) is defined as 1 mass%.
  • examples of such a solvent include a tetrahydrofuran / methanol (mass ratio: 1/1) solution, a tetrahydrofuran / acetonitrile (mass ratio: 1/1) solution, and the like. Mass ratio: 1/1) Use the solution.
  • the reaction rate of the methacrylate monomer in the pressure-sensitive adhesive sheet obtained by the above procedure is more than 80%, and 85% or more is preferable, 90% or more is more preferable, and 95% or more is more preferable in that the adhesiveness of the pressure-sensitive adhesive sheet is more excellent. preferable.
  • the upper limit is not particularly limited, but is preferably 100% by mass. When the said reaction rate is 80% or less, the adhesiveness of an adhesive sheet is inferior.
  • the reaction rate (%) intends the reaction rate in the adhesive sheet of the methacrylate monomer contained in the composition. Liquid column chromatography (HPLC) is used as a method for measuring the reaction rate (%) of the methacrylate monomer. More specifically, the reaction rate of the methacrylate monomer is as follows.
  • the same amount (30 g) of the composition and the pressure-sensitive adhesive sheet obtained from the composition are weighed, and each of them is added to a predetermined solvent (10 g) at room temperature.
  • the solvent whose solubility of a methacrylate monomer is 1 mass% or more is used as a predetermined
  • the solubility (mass%) is intended to mean an amount in which the methacrylate monomer is uniformly dissolved in the solvent. For example, when 1 g of the methacrylate monomer is uniformly dissolved in 100 g of the solvent, the solubility (mass%) is It is defined as 1% by mass.
  • Examples of such a solvent include a tetrahydrofuran / methanol (mass ratio: 1/1) solution, a tetrahydrofuran / acetonitrile (mass ratio: 1/1) solution, and the like. Mass ratio: 1/1) Use the solution.
  • the gel fraction of the pressure-sensitive adhesive sheet obtained by the above procedure is 30% or more, and 33% or more is preferable and 35% or more is more preferable in terms of more excellent peeling characteristics of the pressure-sensitive adhesive sheet.
  • the upper limit is not particularly limited, but is preferably 50% or less, more preferably 40% or less, from the viewpoint of step following ability. When the said gel fraction is less than 30%, the peeling characteristic of an adhesive sheet is inferior.
  • the measuring method of the gel fraction of an adhesive sheet is as follows. That is, the pressure-sensitive adhesive sheet (0.2 g) is immersed in a predetermined solvent (30 g) and allowed to stand for 24 hours while being kept at 40 ° C. Thereby, components other than the gel component in an adhesive sheet melt
  • the solvent whose solubility of a tackifier is 1 mass% or more is used as a predetermined solvent.
  • the solubility (mass%) is intended to mean the amount that the tackifier is uniformly dissolved in the solvent.
  • the solubility (mass%) is defined as 1% by mass.
  • examples of such a solvent include tetrahydrofuran, toluene, hexane, ethyl acetate, and the like. In the examples described later, ethyl acetate is used.
  • the thickness of the pressure-sensitive adhesive sheet is not particularly limited, but is usually about the thickness of the precursor film, preferably 200 to 2500 ⁇ m, and more preferably 200 to 500 ⁇ m.
  • the pressure-sensitive adhesive sheet is preferably optically transparent. That is, it is preferably a transparent adhesive sheet. Optically transparent means that the total light transmittance is 85% or more, preferably 90% or more, and more preferably 95% or more.
  • a release sheet may be bonded to the surface of the obtained pressure-sensitive adhesive sheet as necessary.
  • FIG. 1 is a cross-sectional view schematically showing one embodiment of the laminate for a touch panel of the present invention.
  • the laminated body 100 for a touch panel includes an adhesive sheet 12 and a capacitive touch panel sensor 18.
  • FIG. 2 is sectional drawing which represents typically another aspect of the laminated body for touchscreens of this invention.
  • the laminate for touch panel 200 includes a protective substrate 20, an adhesive sheet 12, and a capacitive touch panel sensor 18.
  • FIG. 3A is a cross-sectional view schematically illustrating one embodiment of the capacitive touch panel of the present invention.
  • the capacitive touch panel 300 includes a capacitive touch panel sensor 18, an adhesive sheet 12, and a display device 50.
  • FIG. 3B is a cross-sectional view schematically showing another aspect of the capacitive touch panel of the present invention.
  • the capacitive touch panel 400 includes the protective substrate 20, the adhesive sheet 12, the capacitive touch panel sensor 18, the adhesive sheet 12, and the display device 50.
  • the protective substrate 20 the adhesive sheet 12
  • the capacitive touch panel sensor 18 the adhesive sheet 12
  • the display device 50 the display device 50.
  • the capacitive touch panel sensor 18 is arranged on the display device (operator side) and uses a change in capacitance that occurs when an external conductor such as a human finger comes into contact (approaching). This is a sensor that detects the position of an external conductor such as a finger.
  • the configuration of the capacitive touch panel sensor 18 is not particularly limited, but usually has a detection electrode (especially, a detection electrode extending in the X direction and a detection electrode extending in the Y direction), and the static electricity of the detection electrode in contact with or close to the finger.
  • the coordinates of the finger are specified by detecting the change in capacitance.
  • FIG. 4 shows a plan view of the capacitive touch panel sensor 180.
  • FIG. 5 is a cross-sectional view taken along the cutting line AA in FIG.
  • the capacitive touch panel sensor 180 includes a substrate 22, a first detection electrode 24 disposed on one main surface (surface) of the substrate 22, a first lead-out wiring 26, and the other main surface of the substrate 22.
  • a second detection electrode 28, a second lead-out wiring 30, and a flexible printed wiring board 32 are provided on the upper side (on the back surface).
  • the region where the first detection electrode 24 and the second detection electrode 28 are provided constitutes an input region E I (an input region (sensing unit) capable of detecting the contact of an object) that can be input by the user, and input.
  • a first lead wiring 26, a second lead wiring 30 and a flexible printed wiring board 32 are arranged in the outer region E O located outside the region E I. Below, the said structure is explained in full detail.
  • the substrate 22 plays a role of supporting the first detection electrode 24 and the second detection electrode 28 in the input region E I and plays a role of supporting the first lead wiring 26 and the second lead wiring 30 in the outer region E O. It is a member.
  • the substrate 22 preferably transmits light appropriately. Specifically, the total light transmittance of the substrate 22 is preferably 85 to 100%.
  • the substrate 22 preferably has an insulating property (is an insulating substrate). That is, the substrate 22 is a layer for ensuring insulation between the first detection electrode 24 and the second detection electrode 28.
  • the substrate 22 is preferably a transparent substrate (particularly a transparent insulating substrate).
  • a transparent substrate particularly a transparent insulating substrate.
  • Specific examples thereof include an insulating resin substrate, a ceramic substrate, and a glass substrate.
  • an insulating resin substrate is preferable because of its excellent toughness.
  • the material constituting the insulating resin substrate is polyethylene terephthalate, polyethersulfone, polyacrylic resin, polyurethane resin, polyester, polycarbonate, polysulfone, polyamide, polyarylate, polyolefin, cellulose resin, poly Examples include vinyl chloride and cycloolefin resins.
  • polyethylene terephthalate, cycloolefin resin, polycarbonate, and triacetyl cellulose resin are preferable because of excellent transparency.
  • the substrate 22 is a single layer, but may be a multilayer of two or more layers.
  • the thickness of the substrate 22 (when the substrate 22 is a multilayer of two or more layers, the total thickness thereof) is not particularly limited, but is preferably 5 to 350 ⁇ m, more preferably 30 to 150 ⁇ m. Within the above range, desired visible light transmittance can be obtained, and handling is easy.
  • substrate 22 is substantially rectangular shape, However, It is not restricted to this. For example, it may be circular or polygonal.
  • the first detection electrode 24 and the second detection electrode 28 are sensing electrodes that sense a change in capacitance, and constitute a sensing unit (sensor unit). That is, when the fingertip is brought into contact with the touch panel, the mutual capacitance between the first detection electrode 24 and the second detection electrode 28 changes, and the position of the fingertip is calculated by the IC circuit based on the change amount.
  • the first detection electrodes 24 are electrodes that extend in a first direction (X direction) and are arranged at a predetermined interval in a second direction (Y direction) orthogonal to the first direction.
  • the second detection electrode 28 has a role of detecting the input position in the Y direction of the user's finger approaching the input area E I and has a function of generating a capacitance between the second detection electrode 28 and the finger. ing.
  • the second detection electrodes 28 are electrodes that extend in the second direction (Y direction) and are arranged at a predetermined interval in the first direction (X direction), and include a predetermined pattern as will be described later. In FIG. 4, five first detection electrodes 24 and five second detection electrodes 28 are provided, but the number is not particularly limited and may be plural.
  • the first detection electrode 24 and the second detection electrode 28 are composed of conductive thin wires.
  • FIG. 6 shows an enlarged plan view of a part of the first detection electrode 24.
  • the first detection electrode 24 is composed of conductive thin wires 34, and includes a plurality of gratings 36 formed of intersecting conductive thin wires 34.
  • the second detection electrode 28 similarly to the first detection electrode 24, also includes a plurality of lattices 36 formed by intersecting conductive thin wires 34.
  • Examples of the material of the conductive thin wire 34 include metals and alloys such as gold (Au), silver (Ag), copper (Cu), and aluminum (Al), ITO, tin oxide, zinc oxide, cadmium oxide, gallium oxide, Examples thereof include metal oxides such as titanium oxide. Among these, silver is preferable because the conductivity of the conductive thin wire 34 is excellent.
  • the conductive fine wire 34 preferably contains a binder from the viewpoint of adhesion between the conductive fine wire 34 and the substrate 22.
  • the binder is preferably a water-soluble polymer because the adhesion between the conductive thin wire 34 and the substrate 22 is more excellent.
  • the binder include gelatin, carrageenan, polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), polysaccharides such as starch, cellulose and derivatives thereof, polyethylene oxide, polysaccharides, polyvinylamine, chitosan, polylysine, polyacryl. Examples include acid, polyalginic acid, polyhyaluronic acid, carboxycellulose, gum arabic, and sodium alginate.
  • gelatin is preferable because the adhesion between the conductive thin wire 34 and the substrate 22 is more excellent.
  • acid-processed gelatin may be used as gelatin, and gelatin hydrolyzate, gelatin enzyme decomposition product, and other gelatins modified with amino groups and carboxy groups (phthalated gelatin, acetylated gelatin) Can be used.
  • a polymer different from the above gelatin may be used together with gelatin.
  • the type of polymer used is not particularly limited as long as it is different from gelatin.
  • the volume ratio of metal to binder (metal volume / binder volume) in the conductive thin wire 34 is preferably 1.0 or more, and more preferably 1.5 or more. By setting the volume ratio of the metal and the binder to 1.0 or more, the conductivity of the conductive thin wire 34 can be further increased.
  • the upper limit is not particularly limited, but is preferably 6.0 or less, more preferably 4.0 or less, and even more preferably 2.5 or less from the viewpoint of productivity.
  • the volume ratio of the metal and the binder can be calculated from the density of the metal and the binder contained in the conductive thin wire 34. For example, when the metal is silver, the density of silver is 10.5 g / cm 3 , and when the binder is gelatin, the density of gelatin is 1.34 g / cm 3 .
  • the line width of the conductive thin wire 34 is not particularly limited, it is preferably 30 ⁇ m or less, more preferably 15 ⁇ m or less, further preferably 10 ⁇ m or less, and particularly preferably 9 ⁇ m or less, from the viewpoint that a low-resistance electrode can be formed relatively easily. 7 ⁇ m or less is most preferable, 0.5 ⁇ m or more is preferable, and 1.0 ⁇ m or more is more preferable.
  • the thickness of the conductive thin wire 34 is not particularly limited, but can be selected from 0.00001 mm to 0.2 mm from the viewpoint of conductivity and visibility, but is preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less, and 0.01 Is more preferably from 9 to 9 ⁇ m, most preferably from 0.05 to 5 ⁇ m.
  • the lattice 36 includes an opening region surrounded by the thin conductive wires 34.
  • the length W of one side of the grating 36 is preferably 800 ⁇ m or less, more preferably 600 ⁇ m or less, and preferably 400 ⁇ m or more.
  • the aperture ratio is preferably 85% or more, more preferably 90% or more, and most preferably 95% or more in terms of visible light transmittance. preferable.
  • the aperture ratio corresponds to the ratio of the transmissive portion excluding the conductive thin wires 34 in the first detection electrode 24 or the second detection electrode 28 in the predetermined region.
  • the lattice 36 has a substantially rhombus shape.
  • other polygonal shapes for example, a triangle, a quadrangle, a hexagon, and a random polygon
  • the shape of one side may be a curved shape or a circular arc shape in addition to a linear shape.
  • the arc shape for example, the two opposing sides may have an outwardly convex arc shape, and the other two opposing sides may have an inwardly convex arc shape.
  • the shape of each side may be a wavy shape in which an outwardly convex arc and an inwardly convex arc are continuous. Of course, the shape of each side may be a sine curve.
  • the conductive thin wire 34 is formed as a mesh pattern, but is not limited to this mode, and may be a stripe pattern.
  • the first lead wiring 26 and the second lead wiring 30 are members that play a role in applying a voltage to the first detection electrode 24 and the second detection electrode 28, respectively.
  • the first lead wiring 26 is disposed on the substrate 22 in the outer region E O , one end of which is electrically connected to the corresponding first detection electrode 24, and the other end is electrically connected to the flexible printed wiring board 32.
  • the second lead wiring 30 is disposed on the substrate 22 in the outer region E O , one end of which is electrically connected to the corresponding second detection electrode 28, and the other end is electrically connected to the flexible printed wiring board 32.
  • the In FIG. 4, five first extraction wirings 26 and five second extraction wirings 30 are illustrated, but the number is not particularly limited, and a plurality of the first extraction wirings are usually arranged according to the number of detection electrodes.
  • Examples of the material constituting the first lead wiring 26 and the second lead wiring 30 include metals such as gold (Au), silver (Ag), and copper (Cu), tin oxide, zinc oxide, cadmium oxide, and gallium oxide. And metal oxides such as titanium oxide.
  • silver is preferable because of its excellent conductivity.
  • a metal paste a screen printing or ink jet printing method is used, and in the case of a metal or alloy thin film, a patterning method such as a photolithography method is suitably used for the sputtered film.
  • the binder is contained in the 1st extraction wiring 26 and the 2nd extraction wiring 30 from the point which adhesiveness with the board
  • the kind of binder is as above-mentioned.
  • the flexible printed wiring board 32 is a board in which a plurality of wirings and terminals are provided on a substrate, and is connected to each other end of the first lead wiring 26 and each other end of the second lead wiring 30 to electrostatically It plays a role of connecting the capacitive touch panel sensor 180 and an external device (for example, a display device).
  • the manufacturing method of the capacitive touch panel sensor 180 is not particularly limited, and a known method can be adopted. For example, there is a method in which a photoresist film on the metal foil formed on both main surfaces of the substrate 22 is exposed and developed to form a resist pattern, and the metal foil exposed from the resist pattern is etched. Further, there is a method in which a paste containing metal fine particles or metal nanowires is printed on both main surfaces of the substrate 22 and metal plating is performed on the paste. Moreover, the method of printing and forming on the board
  • a method using silver halide can be mentioned. More specifically, the step (1) of forming a silver halide emulsion layer (hereinafter also referred to simply as a photosensitive layer) containing silver halide and a binder on both surfaces of the substrate 22, respectively, exposing the photosensitive layer. Then, the method which has the process (2) which carries out image development processing is mentioned. Below, each process is demonstrated.
  • a silver halide emulsion layer hereinafter also referred to simply as a photosensitive layer
  • Step (1) is a step of forming a photosensitive layer containing silver halide and a binder on both surfaces of the substrate 22.
  • the method for forming the photosensitive layer is not particularly limited, but from the viewpoint of productivity, the photosensitive layer forming composition containing silver halide and a binder is brought into contact with the substrate 22, and the photosensitive layer is formed on both surfaces of the substrate 22.
  • the method of forming is preferred. Below, after explaining in full detail the aspect of the composition for photosensitive layer formation used with the said method, the procedure of a process is explained in full detail.
  • the photosensitive layer forming composition contains a silver halide and a binder.
  • the halogen element contained in the silver halide may be any of chlorine, bromine, iodine and fluorine, or a combination thereof.
  • As the silver halide for example, silver halides mainly composed of silver chloride, silver bromide and silver iodide are preferably used, and silver halides mainly composed of silver bromide and silver chloride are preferably used.
  • the kind of binder used is as above-mentioned.
  • the binder may be contained in the composition for photosensitive layer formation in the form of latex.
  • the volume ratio of the silver halide and the binder contained in the composition for forming the photosensitive layer is not particularly limited, and is appropriately adjusted so as to be within a preferable volume ratio range of the metal and the binder in the conductive thin wire 34 described above. Is done.
  • the composition for forming a photosensitive layer contains a solvent, if necessary.
  • the solvent used include water, organic solvents (for example, alcohols such as methanol, ketones such as acetone, amides such as formamide, sulfoxides such as dimethyl sulfoxide, esters such as ethyl acetate, ethers, and the like. Etc.), ionic liquids, or mixed solvents thereof.
  • the content of the solvent to be used is not particularly limited, but is preferably in the range of 30 to 90% by mass, and more preferably in the range of 50 to 80% by mass with respect to the total mass of silver halide and binder.
  • the method for bringing the composition for forming a photosensitive layer and the substrate 22 into contact with each other is not particularly limited, and a known method can be adopted.
  • substrate 22 in the composition for photosensitive layer formation, etc. are mentioned.
  • the content of the binder in the formed photosensitive layer is not particularly limited but is preferably 0.3 ⁇ 5.0g / m 2, more preferably 0.5 ⁇ 2.0g / m 2.
  • the content of the silver halide in the photosensitive layer is not particularly limited, but is preferably 1.0 to 20.0 g / m 2 in terms of silver from the viewpoint that the conductive properties of the conductive fine wire 34 are more excellent. 0 to 15.0 g / m 2 is more preferable.
  • the protective layer By providing the protective layer, scratches can be prevented and mechanical properties can be improved.
  • Step (2) Exposure development process>
  • the photosensitive layer obtained in the above step (1) is subjected to pattern exposure and then developed to thereby perform the first detection electrode 24 and the first lead wiring 26, and the second detection electrode 28 and the second detection electrode 28.
  • This is a step of forming two lead-out wirings 30.
  • the pattern exposure process will be described in detail below, and then the development process will be described in detail.
  • the silver halide in the photosensitive layer in the exposed region forms a latent image.
  • conductive thin lines are formed by a development process described later.
  • the silver halide dissolves and flows out of the photosensitive layer during the fixing process described later, and a transparent film is obtained.
  • the light source used in the exposure is not particularly limited, and examples thereof include light such as visible light and ultraviolet light, and radiation such as X-rays.
  • the method for performing pattern exposure is not particularly limited. For example, surface exposure using a photomask may be performed, or scanning exposure using a laser beam may be performed.
  • the shape of the pattern is not particularly limited, and is appropriately adjusted according to the pattern of the conductive fine wire to be formed.
  • the development processing method is not particularly limited, and a known method can be employed.
  • a usual development processing technique used for silver salt photographic film, photographic paper, film for printing plate making, emulsion mask for photomask, and the like can be used.
  • the type of the developer used in the development process is not particularly limited.
  • PQ developer, MQ developer, MAA developer and the like can be used.
  • Commercially available products include, for example, CN-16, CR-56, CP45X, FD-3, Papitol, C-41, E-6, RA-4, D-19, D-72 prescribed by KODAK.
  • a developer contained in a kit thereof can be used.
  • a lith developer can also be used.
  • the development process can include a fixing process performed for the purpose of removing and stabilizing the silver salt in the unexposed part.
  • a technique of fixing process used for silver salt photographic film, photographic paper, film for printing plate making, emulsion mask for photomask and the like can be used.
  • the fixing temperature in the fixing step is preferably about 20 ° C. to about 50 ° C., more preferably 25 to 45 ° C.
  • the fixing time is preferably 5 seconds to 1 minute, more preferably 7 seconds to 50 seconds.
  • the mass of the metallic silver contained in the exposed area (conductive thin wire) after the development treatment is preferably a content of 50% by mass or more based on the mass of silver contained in the exposed area before the exposure, More preferably, it is at least mass%. If the mass of silver contained in the exposed portion is 50% by mass or more based on the mass of silver contained in the exposed portion before exposure, it is preferable because high conductivity can be obtained.
  • the following undercoat layer forming step, antihalation layer forming step, or heat treatment may be performed as necessary.
  • Undercoat layer forming process For the reason of excellent adhesion between the substrate 22 and the silver halide emulsion layer, it is preferable to perform a step of forming an undercoat layer containing the binder on both sides of the substrate 22 before the step (1).
  • the binder used is as described above.
  • the thickness of the undercoat layer is not particularly limited, but is preferably from 0.01 to 0.5 ⁇ m, more preferably from 0.01 to 0.1 ⁇ m, from the viewpoint that the adhesiveness and the rate of change in mutual capacitance can be further suppressed.
  • Anti-halation layer formation process From the viewpoint of thinning the conductive thin wire 34, it is preferable to carry out a step of forming antihalation layers on both surfaces of the substrate 22 before the step (1).
  • Step (3) is a step of performing heat treatment after the development processing. By performing this step, fusion occurs between the binders, and the hardness of the conductive thin wires 34 is further increased.
  • the binder when polymer particles are dispersed as a binder in the composition for forming a photosensitive layer (when the binder is polymer particles in latex), by performing this step, fusion occurs between the polymer particles, Conductive thin wires 34 having a desired hardness are formed.
  • the conditions for the heat treatment are appropriately selected depending on the binder to be used, but it is preferably 40 ° C. or higher from the viewpoint of the film forming temperature of the polymer particles, more preferably 50 ° C. or higher, and further 60 ° C. or higher.
  • the heating time is not particularly limited, but is preferably 1 to 5 minutes and more preferably 1 to 3 minutes from the viewpoint of suppressing curling of the substrate and the like and productivity.
  • this heat treatment can be combined with a drying step usually performed after exposure and development processing, it is not necessary to increase a new step for film formation of polymer particles, and productivity, cost, etc. Excellent from a viewpoint.
  • the light transmissive part containing a binder is formed between the electroconductive thin wires 34.
  • FIG. The transmittance in the light-transmitting portion is preferably 90% or more, more preferably 95% or more, still more preferably 97% or more, and more preferably 98% or more, as shown by the minimum transmittance in the wavelength region of 380 to 780 nm. Is particularly preferable, and 99% or more is most preferable.
  • the light transmissive portion may contain materials other than the binder, and examples thereof include a silver difficult solvent.
  • the capacitive touch panel sensor is not limited to the aspect of FIG. 4 described above, and may be another aspect.
  • the capacitive touch panel sensor 280 is electrically connected to the first substrate 38, the second detection electrode 28 disposed on the first substrate 38, and one end of the second detection electrode 28. And electrically connected to one end of the second lead-out wiring (not shown) disposed on the first substrate 38, the adhesive sheet 40, the first detection electrode 24, and the first detection electrode 24.
  • the capacitive touch panel sensor 280 has the same configuration as the capacitive touch panel sensor 180 except for the first substrate 38, the second substrate 42, and the adhesive sheet 40. Therefore, the same components are denoted by the same reference numerals, and the description thereof is omitted.
  • the definitions of the first substrate 38 and the second substrate 42 are the same as the definition of the substrate 22 described above.
  • the pressure-sensitive adhesive sheet 40 is a layer for bringing the first detection electrode 24 and the second detection electrode 28 into close contact with each other, and is preferably optically transparent (preferably a transparent pressure-sensitive adhesive sheet).
  • a known material may be used as the material constituting the pressure-sensitive adhesive sheet 40, and the pressure-sensitive adhesive sheet 12 may be used as the pressure-sensitive adhesive sheet 40.
  • a plurality of the first detection electrodes 24 and the second detection electrodes 28 in FIG. 7 are used as shown in FIG. 4, and both are arranged so as to be orthogonal to each other as shown in FIG.
  • the capacitive touch panel sensor 280 shown in FIG. 7 is prepared by preparing two substrates with electrodes having a substrate and detection electrodes and lead wires arranged on the substrate surface, so that the electrodes face each other. Corresponds to the capacitive touch panel sensor obtained by bonding through the.
  • the capacitive touch panel sensor 380 is electrically connected to the first substrate 38, the second detection electrode 28 disposed on the first substrate 38, and one end of the second detection electrode 28.
  • a second lead-out wiring (not shown), an adhesive sheet 40, a second substrate 42, a first detection electrode 24 disposed on the second substrate 42, and one end of the first detection electrode 24;
  • a first lead-out wiring (not shown) and a flexible printed wiring board (not shown) which are electrically connected and are arranged on the second substrate 42 are provided.
  • the capacitive touch panel sensor 380 shown in FIG. 8 has the same layers as the capacitive touch panel sensor 280 shown in FIG. 7 except that the order of the layers is different.
  • the capacitive touch panel sensor 380 shown in FIG. 8 prepares two substrates with electrodes having a substrate and detection electrodes and lead wires arranged on the substrate surface, and the substrate in the substrate with one electrode It corresponds to the electrostatic capacitance type touch panel sensor obtained by bonding through an adhesive sheet so that the electrode of the other board
  • the conductive thin wires 34 of the first detection electrode 24 and the second detection electrode 28 are made of metal oxide particles, metal such as silver paste or copper paste. You may be comprised with the paste. Among these, a conductive film made of a thin silver wire and a silver nanowire conductive film are preferable in terms of excellent conductivity and transparency.
  • the first detection electrode 24 and the second detection electrode 28 are configured by the mesh structure of the conductive thin wires 34.
  • the present invention is not limited to this mode.
  • a metal oxide thin film (transparent metal) such as ITO or ZnO is used.
  • FIG. 9 is a partial plan view of the input area of the capacitive touch panel sensor 180a.
  • FIG. 10 is a cross-sectional view taken along the cutting line AA in FIG.
  • the capacitive touch panel sensor 180a is electrically connected to the first substrate 38, the second detection electrode 28a disposed on the first substrate 38, and one end of the second detection electrode 28a.
  • a second lead-out wiring (not shown), an adhesive sheet 40, a second substrate 42, a first detection electrode 24a disposed on the second substrate 42, and one end of the first detection electrode 24a.
  • a first lead-out wiring (not shown) and a flexible printed wiring board (not shown) which are electrically connected and are arranged on the second substrate 42 are provided.
  • the capacitive touch panel sensor 180a shown in FIGS. 9 and 10 has the same layer as the capacitive touch panel sensor 380 shown in FIG. 8 except for the points other than the first detection electrode 24a and the second detection electrode 28a. Therefore, the same components are denoted by the same reference numerals, and the description thereof is omitted.
  • the first detection electrode 24a and the second detection electrode 28a are electrodes extending in the X-axis direction and the Y-axis direction, respectively, and are made of a transparent metal oxide, for example, indium tin oxide (ITO).
  • ITO indium tin oxide
  • the 9 and 10 in order to make use of the transparent electrode ITO as a sensor, the resistance of the indium tin oxide (ITO) itself is increased, the total wiring resistance is reduced by increasing the electrode area, and the thickness is further increased. It is designed to ensure the light transmittance by making it thinner and taking advantage of the characteristics of the transparent electrode.
  • examples of materials that can be used in the above embodiment include zinc oxide (ZnO), indium zinc oxide (IZO), gallium zinc oxide (GZO), and aluminum zinc oxide (AZO). It is done.
  • the patterning of the electrode parts can be selected according to the material of the electrode part, and includes a photolithography method, a resist mask screen printing-etching method, an inkjet method, a printing method, and the like. It may be used.
  • the protective substrate 20 is a substrate disposed on the adhesive sheet, and serves to protect a capacitive touch panel sensor 18 (to be described later) from the external environment, and its main surface constitutes a touch surface.
  • the protective substrate 20 is preferably a transparent substrate, and a plastic film, a plastic plate, a glass plate, or the like is used. It is desirable that the thickness of the substrate is appropriately selected according to each application.
  • polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN); polyolefins such as polyethylene (PE), polypropylene (PP), polystyrene, and EVA; Resin;
  • polycarbonate (PC) polyamide, polyimide, acrylic resin, triacetyl cellulose (TAC), cycloolefin resin (COP), and the like can be used.
  • a polarizing plate, a circular polarizing plate, or the like may be used as the protective substrate 20 .
  • the display device 50 is a device having a display surface for displaying an image, and each member is arranged on the display screen side.
  • the type of the display device 50 is not particularly limited, and a known display device can be used.
  • cathode ray tube (CRT) display liquid crystal display (LCD), organic light emitting diode (OLED) display, vacuum fluorescent display (VFD), plasma display panel (PDP), surface field display (SED) or field emission display (FED) or electronic paper (E-Paper).
  • CTR cathode ray tube
  • LCD liquid crystal display
  • OLED organic light emitting diode
  • VFD vacuum fluorescent display
  • PDP plasma display panel
  • SED surface field display
  • FED field emission display
  • E-Paper electronic paper
  • the above-mentioned pressure-sensitive adhesive sheet of the present invention can be suitably used for the production of a capacitive touch panel.
  • a capacitive touch panel For example, between the display device and the capacitive touch panel sensor, between the capacitive touch panel sensor and a protective substrate, or on the substrate and the substrate in the capacitive touch sensor. It is used to provide an adhesive sheet that is disposed between conductive films provided with detection electrodes.
  • the pressure-sensitive adhesive sheet of the present invention is preferably used for providing a pressure-sensitive adhesive layer adjacent to the detection electrode in the capacitive touch panel. When used in such an aspect, it is preferable because touch malfunctions due to the influence of the above-described variation factors can be remarkably reduced.
  • the adhesive sheet is adjacent to the detection electrode
  • the capacitive touch panel sensor has a configuration in which the detection electrode is arranged on the back surface of the substrate, the detection electrode is in contact with both detection electrodes.
  • an adhesive sheet is arrange
  • the capacitive touch panel sensor has two conductive films each having a substrate and a detection electrode disposed on one side of the substrate, and the two conductive films are detected when bonded.
  • positioned so that an electrode may be touched is mentioned. More specifically, the case where it uses as an aspect of the adhesive sheet 40 of FIG. 7 and FIG. 8 is mentioned.
  • Example 1 to 42 Comparative Examples 1 to 22>
  • Each pressure-sensitive adhesive composition was obtained by mixing the components shown in Table 1 below in the blending amounts (parts by mass) shown in Table 1 below and stirring them.
  • the left side of the slash (/) represents the component (the numerical value in parentheses is the SP value of the component), and the right side of the slash (/) represents the compounding amount (part by mass) of the component.
  • the curable pressure-sensitive adhesive composition of Example 1 contains EHMA (20 parts by mass), FA-512M (5 parts by mass), TPO (2.5 parts by mass), and UC-203 (21.78 parts by mass). Part), P-135 (38.8 parts by mass), and Polyoil 110 (11.9 parts by mass) are mixed and stirred to obtain a curable pressure-sensitive adhesive composition. Details of each component are as described below.
  • the configuration of the obtained sample corresponds to an embodiment in which an adhesive sheet 54 and optical PET 56 are arranged on a glass substrate 50 on which a Kapton tape 52 is pasted.
  • a gap 58 is easily generated between the glass substrate 50 and the adhesive sheet 54 at the step portion of the Kapton tape 52, and the boundary gap width is not in contact with the Kapton tape 52 and the adhesive sheet 54.
  • a distance D on the glass substrate is intended.
  • the largest value of less than 20 ⁇ m is designated as “A” as having excellent step followability, and those having 20 ⁇ m or more but less than 50 ⁇ m are designated as “B” having relatively excellent step followability, A material having a thickness of 50 ⁇ m or more and less than 100 ⁇ m is not preferable, but “C” is used as a practically usable product, and a product having a size of 100 ⁇ m or more is “D” because it is inferior in level-step following and has no practicality.
  • Table 1 The results are shown in Table 1.
  • b / a represents a mass ratio (b / a) between the total content (b) of the “methacrylate monomer” and the total content (a) of the photopolymerization initiator.
  • O / C ratio represents the ratio between the number of moles of oxygen atoms and the number of moles of carbon atoms contained in the curable pressure-sensitive adhesive composition (number of moles of oxygen atoms / number of moles of carbon atoms).
  • film thickness intends the thickness of the precursor film.
  • “-” means that evaluation is not performed.
  • hardening failure since the curing was insufficient, the peeling characteristics could not be evaluated.
  • EHMA 2-ethylhexyl methacrylate (SP value: 8.1 (MPa) 1/2 )
  • DDMA dodecyl methacrylate (SP value: 8.2 (MPa) 1/2 )
  • IBXA isobornyl acrylate (SP value: 8.33 (MPa) 1/2 )
  • IBX isobornyl methacrylate (SP value: 8.3 (MPa) 1/2 )
  • StMA Stearyl methacrylate (SP value: 5.0 (MPa) 1/2 )
  • EHA 2-ethylhexyl acrylate (SP value: 7.8)
  • FA-512M dicyclopentenyloxyethyl methacrylate, manufactured by Hitachi Chemical Co., Ltd.
  • NVP N-vinylpyrrolidone (manufactured by Nippon Shokubai Co., Ltd.)
  • NVC N-vinylcaprolactam (BASF) M-100: 3,4-epoxycyclohexylmethyl methacrylate (manufactured by Daicel Chemical Industries)
  • OXE-1 1.2-octanedione, 1- “4- (phenylthio)-, 2- (O-benzoyloxime)” (manufactured by BASF)
  • TPO Lucirin TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide, manufactured by BASF)
  • IRG819 Irgacure 819 (bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, manufactured by BASF)
  • IRG907 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one
  • IRG184 Irgacur
  • the pressure-sensitive adhesive sheet obtained from the production method of the present invention has a desired effect.
  • Example 8 containing no hydroxyketone-based photopolymerization initiator showed better optical properties and adhesion.
  • the direction of Example 3 which does not contain an aminoketone type photoinitiator shows the more excellent optical characteristic.
  • the photopolymerization initiator includes at least one selected from the group consisting of a monoacylphosphine oxide photopolymerization initiator and a bisacylphosphine oxide photopolymerization initiator.
  • the photopolymerization initiator includes at least one selected from the group consisting of a monoacylphosphine oxide photopolymerization initiator and a bisacylphosphine oxide photopolymerization initiator. It was confirmed that Example 3 showed better optical properties, adhesion and step following ability.
  • a comparison between Example 3 and 20 to 22 confirmed that Examples 3 and 21 to 22 in which the thickness of the precursor film was 250 ⁇ m or more showed better step following ability. In particular, it was confirmed that Examples 21 to 22 in which the thickness of the precursor film was 300 ⁇ m or more showed better adhesion.
  • Example 22 in which the thickness of the precursor film was 400 ⁇ m or more showed better adhesion.
  • Example 29 in which the thickness of the precursor film was 300 ⁇ m or more showed better adhesion.
  • a comparison between Examples 19 and 27 to 28 confirmed that Examples 27 to 28 having a precursor film thickness of 300 ⁇ m or more showed better adhesion.
  • illuminance 30 mW / cm 2 ultra 80 mW / cm 2 or less is Examples 23 to 24 were confirmed to exhibit superior conformability to irregularities.
  • Comparative Examples 1 to 12 where the illuminance is not a predetermined condition Comparative Examples 13 to 13 where the mass ratio (b / a) of the content (b) of the methacrylate monomer and the content (a) of the photopolymerization initiator is not within the predetermined range 18.
  • the pressure-sensitive adhesive sheets obtained in Comparative Examples 19 to 20 having a small thickness and Comparative Examples 21 to 22 using an acrylate monomer did not have the desired effects.
  • Adhesive sheets 18, 180, 180 a, 280, 380 Capacitive touch panel sensor 20 Protective substrate 22 Substrate 24, 24 a First detection electrode 26, 26 a First extraction wiring 28, 28 a Second detection electrode 30 Second extraction wiring 32 Flexible printed wiring board 34 Conductive thin wire 36 Lattice 38 First substrate 40 Adhesive sheet 42 Second substrate 50 Glass substrate 52 Kapton tape 54 Adhesive sheet 56 Optical PET 58 Gap 100, 200 Laminate 300, 400 for touch panel Capacitive touch panel

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  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Polymers & Plastics (AREA)
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Abstract

La présente invention concerne un procédé de production d'une feuille adhésive, grâce auquel il est possible de produire une feuille adhésive épaisse présentant une excellente adhésivité, d'excellentes propriétés optiques, d'excellentes propriétés de pelage et une excellente capacité à se conformer à des étapes. La présente invention vise aussi à fournir une feuille adhésive, un stratifié pour un écran tactile, et un écran tactile capacitif. Ce procédé de production d'une feuille adhésive implique une étape de production d'une feuille adhésive par irradiation d'un film précurseur avec une lumière ayant un éclairement supérieur à 0,1 mW/cm2 et inférieur à 200 mW/cm2. Le film précurseur a une épaisseur de 200 µm ou plus et est formé par application, sur un substrat, d'une composition d'un agent adhésif durcissable contenant un agent de pégosité, un amorceur de photopolymérisation, un agent de réticulation ayant deux groupes de polymérisation radicalaire ou plus, et un méthacrylate monomère ayant un groupe méthacryloyle, le rapport en masse entre la teneur en le méthacrylate monomère et la teneur en l'amorceur de photopolymérisation dans la composition de l'agent adhésif durcissable étant compris dans une plage prédéterminée, la teneur en le méthacrylate monomère, par rapport à la masse totale de la composition de l'agent adhésif durcissable, étant comprise dans une plage prédéterminée, et la teneur en l'agent de pégosité, par rapport à la masse totale de la composition de l'agent adhésif durcissable, étant comprise dans une plage prédéterminée.
PCT/JP2015/053392 2014-03-20 2015-02-06 Procédé de production d'une feuille adhésive, feuille adhésive, stratifié pour écran tactile et écran tactile capacitif Ceased WO2015141323A1 (fr)

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CN110295013A (zh) * 2018-03-22 2019-10-01 琳得科株式会社 直接接合膜、显示体及显示体的制造方法
JP2020160212A (ja) * 2019-03-26 2020-10-01 凸版印刷株式会社 プライマー層形成用組成物、バリアフィルム、波長変換シート、及び、波長変換シートの製造方法

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JP7003401B2 (ja) * 2016-11-01 2022-02-10 三菱ケミカル株式会社 活性エネルギー線硬化性樹脂組成物およびコーティング剤

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JP2003277695A (ja) * 2002-03-22 2003-10-02 Dainippon Ink & Chem Inc Ｕｖ硬化型アクリル系粘着剤組成物
JP2009116127A (ja) * 2007-11-07 2009-05-28 Tomoegawa Paper Co Ltd 異方性拡散媒体及びそれを使用した光源ユニット
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CN110295013B (zh) * 2018-03-22 2023-04-28 琳得科株式会社 直接接合膜、显示体及显示体的制造方法
JP2020160212A (ja) * 2019-03-26 2020-10-01 凸版印刷株式会社 プライマー層形成用組成物、バリアフィルム、波長変換シート、及び、波長変換シートの製造方法

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