WO2012035958A1 - 光硬化性透明粘着シート用組成物 - Google Patents
光硬化性透明粘着シート用組成物 Download PDFInfo
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- WO2012035958A1 WO2012035958A1 PCT/JP2011/069288 JP2011069288W WO2012035958A1 WO 2012035958 A1 WO2012035958 A1 WO 2012035958A1 JP 2011069288 W JP2011069288 W JP 2011069288W WO 2012035958 A1 WO2012035958 A1 WO 2012035958A1
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
- C08L23/0869—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters
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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
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- 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
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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
- 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
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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
- C09J7/00—Adhesives in the form of films or foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/02—2 layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/20—Inorganic coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/202—Conductive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
- B32B2457/208—Touch screens
Definitions
- the present invention is characterized in that a photocurable transparent adhesive sheet obtained by curing a composition for a photocurable transparent adhesive sheet and a composition for a photocurable transparent adhesive sheet is used for laminating a transparent conductive film.
- a transparent adhesive sheet for fixing a transparent conductive film, a transparent adhesive sheet for fixing a transparent conductive film, and a transparent adhesive sheet for fixing a transparent conductive film obtained by curing a composition for transparent adhesive sheet for fixing a transparent conductive film are transparent.
- the present invention relates to a laminate that is bonded to a conductive layer surface of a conductive film.
- the touch panel is a transparent base material for transparent optical substrates such as ITO (Indium Tin Oxide) and a transparent substrate, glass and a transparent protective sheet for protecting it, and a display device such as a liquid crystal display. It is the laminated body bonded together using the sheet
- transparent optical substrates such as ITO (Indium Tin Oxide)
- a display device such as a liquid crystal display. It is the laminated body bonded together using the sheet
- touch panels There are two types of touch panels: a resistive touch panel that detects mainly the pressure at the time of input, and a capacitive touch panel that detects the input location by static electricity from the human body at the time of input.
- the capacitive touch panel the conductive layer surface of the transparent conductive film is fixed so as to be in contact with the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive sheet. Therefore, there is a problem that when the pressure-sensitive adhesive layer is in contact with the conductive layer surface of the transparent conductive film, a metal oxidation reaction occurs due to the acid component contained in the pressure-sensitive adhesive, resulting in a decrease in the conductive function. For this reason, the adhesive sheet for fixing a transparent conductive film is required to have high metal corrosion prevention properties.
- a pressure-sensitive adhesive sheet having metal corrosion prevention properties As a pressure-sensitive adhesive sheet having metal corrosion prevention properties, a pressure-sensitive adhesive sheet containing a metal corrosion inhibitor (for example, Patent Document 1) has been proposed. Moreover, the adhesive sheet (for example, patent document 2) which reduced the corrosivity with respect to a transparent conductive film by containing a specific amount of nitrogen atom containing components with respect to the acid component of an adhesive layer is proposed.
- the pressure-sensitive adhesive sheet containing a metal corrosion inhibitor has a problem that the metal corrosion inhibitor is discolored in a durability test and optical properties are deteriorated.
- the pressure-sensitive adhesive sheet containing a specific amount of a nitrogen atom-containing component has a problem that an increase in the electrical resistance value of ITO cannot be sufficiently suppressed due to the acid component contained in the pressure-sensitive adhesive layer.
- the problem to be solved by the present invention is that the transparent adhesive sheet obtained by curing does not corrode the conductive layer even if it is directly bonded to the conductive layer surface of the transparent conductive film, and the cohesive force and transparency of the adhesive layer And it is providing the composition for photocurable transparent adhesive sheets which is excellent in punching workability. Furthermore, it is in providing this transparent adhesive sheet.
- composition for sheets Comprising: The composition for photocurable transparent adhesive sheets whose carboxyl group monomer contained in a photopolymerizable monomer is below a predetermined amount is the composition for photocurable transparent adhesive sheets. It discovered that the transparency of the photocurable transparent adhesive sheet obtained by making it harden
- the present invention is shown by the following (1) to (11).
- the photopolymerizable monomer other than the (meth) acrylic acid ester having a hydroxyl group is a monofunctional alkyl (meth) acrylate and / or a cyclic alkyl (meth) acrylate.
- a (meth) acryl group-containing polyolefin compound having a weight average molecular weight of 10,000 to 300,000 is a polyolefin polyol compound, a (meth) acrylate having a hydroxyl group, and two isocyanate groups in one molecule.
- composition for a photocurable transparent adhesive sheet according to any one of (1) to (6) above, wherein the acid value is 0.5 mgKOH / g or less.
- a photocurable transparent adhesive sheet obtained by curing the composition for a photocurable transparent adhesive sheet according to any one of (1) to (7) above is used for laminating a transparent conductive film.
- a transparent adhesive sheet for fixing a transparent conductive film obtained by curing the composition for transparent adhesive sheet for fixing a transparent conductive film according to (8) above.
- (11) A laminate characterized in that the transparent conductive sheet fixing transparent adhesive sheet according to (9) or (10) is adhered to a conductive layer surface of a transparent conductive film.
- the composition for a photocurable transparent pressure-sensitive adhesive sheet of the present invention contains a high molecular weight (meth) acrylic group-containing polyolefin compound in the composition, and therefore is excellent in flexibility and moisture permeability of a pressure-sensitive adhesive sheet obtained by curing. Furthermore, since the composition contains only a small amount of carboxyl groups, corrosion of the conductive layer surface of the transparent conductive film due to the acid component of the transparent adhesive sheet obtained can be suppressed, and the composition has a hydroxyl group (meta) Since acrylic acid ester is contained, the cohesive force of the obtained adhesive sheet and the adhesiveness to a base material are excellent.
- composition for a photocurable transparent adhesive sheet of the present invention comprises (A) a (meth) acrylic group-containing polyolefin compound having a weight average molecular weight of 10,000 to 300,000, and (B) a (meth) acrylic acid ester having a hydroxyl group. (C) A photopolymerizable monomer other than (meth) acrylic acid ester having a hydroxyl group, and (D) a photopolymerization initiator.
- any polyolefin compound having a polyolefin skeleton and having a (meth) acryl group introduced therein can be used.
- the polyolefin skeleton include polyethylene, polypropylene, ethylene / propylene copolymer, butadiene, isoprene, hydrogenated polybutadiene, hydrogenated polyisoprene, cycloolefin, and the like. Hydrogenated polybutadiene and hydrogenated polyisoprene skeleton are preferable in terms of light resistance, transparency (non-crystalline), and workability (liquid).
- the (meth) acryl group means CH 2 ⁇ CH—CO— or CH 2 ⁇ C (CH 3 ) —CO—.
- the method for introducing the (meth) acrylic group into the polyolefin is not particularly limited, but the polyolefin having a reactive hydroxyl group at the molecular end or the like is esterified with (meth) acrylic acid,
- Examples of the method include (meth) acrylation by adding an isocyanate compound having two or more isocyanate groups in one molecule to a hydroxyl group of polyolefin and reacting the (meth) acrylate having an isocyanate group and a hydroxyl group.
- (meth) acrylic group-containing polyolefin obtained by reacting a polyolefin polyol compound with an isocyanate compound having two or more isocyanate groups in one molecule and then urethanizing a (meth) acrylate having a hydroxyl group.
- a compound is preferable at the point with the high cohesion force of the adhesive sheet obtained.
- the polyolefin polyol compound has two or more hydroxyl groups in one molecule, but preferably has 2 to 4 hydroxyl groups. Further, the weight average molecular weight of the polyolefin polyol compound is preferably 5,000 to 30,000, more preferably 10,000 to 15,000. When the weight average molecular weight of the polyolefin polyol compound is lower than 5,000, the molecular weight of the resulting (meth) acryl group-containing polyolefin compound does not increase, and sufficient strength of the pressure-sensitive adhesive sheet tends not to be obtained. Moreover, when the weight average molecular weight of the polyolefin polyol compound is higher than 30,000, the molecular weight of the resulting (meth) acrylic group-containing polyolefin compound becomes too high and the handling tends to be difficult.
- Examples of the compound having two or more isocyanate groups in one molecule include tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, tetramethylxylylene diisocyanate, isophorone diisocyanate and hydrogenation thereof. And diisocyanate compounds such as products. Of these, isophorone diisocyanate is preferable from the viewpoint of light resistance and ease of reactivity control. These compounds having two or more isocyanate groups in one molecule can be used alone or in combination of two or more.
- the amount of the isocyanate compound having two or more isocyanate groups in one molecule is preferably 8 to 35 parts by mass, more preferably 10 to 30 parts by mass with respect to 100 parts by mass of the polyolefin polyol. More preferably, it is 11 to 25 parts by mass. If the amount of the isocyanate compound having two or more isocyanate groups in one molecule is less than 8 parts by mass, the resulting (meth) acrylic group-containing polyolefin compound becomes too high in molecular weight, making it difficult to handle. When the amount exceeds 35 parts by mass, the molecular weight of the resulting (meth) acrylic group-containing polyolefin compound becomes too low, so that the strength of the pressure-sensitive adhesive sheet tends to be insufficient.
- Examples of the (meth) acrylate having a hydroxyl group to be reacted with an isocyanate group include hydroxyalkyl (meth) acrylate having an alkyl group having 2 to 7 carbon atoms, and specific examples thereof include 2- Hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 1,3-butanediol (meth) acrylate, 1,4-butanediol (meth) acrylate, 1,6 -Hexanediol (meth) acrylate, 3-methylpentanediol (meth) acrylate, etc.
- the amount of the (meth) acrylate having a hydroxyl group is preferably 3 to 18 parts by mass, more preferably 4 to 15 parts by mass with respect to 100 parts by mass of the polyolefin polyol. More preferably.
- the amount of the (meth) acrylate having a hydroxyl group is less than 3 parts by mass, there may be an olefin compound having no (meth) acryl group, and the strength of the pressure-sensitive adhesive sheet is lowered, and the hydroxyl group is )
- the amount of acrylate used exceeds 18 parts by mass, the pressure-sensitive adhesive sheet tends to be hardened because the amount of (meth) acrylic groups introduced into the olefin is too large.
- the number of (meth) acrylic groups introduced in the (A) (meth) acrylic group-containing polyolefin compound of the present invention may be one or more (meth) acrylic groups per molecule, preferably 1 to 1 per molecule. Two.
- the molecular weight of the (meth) acryl group-containing polyolefin compound is preferably 10,000 to 300,000, more preferably 20,000 to 200,000, and even more preferably 30,000 to 100,000. is there.
- the weight average molecular weight is less than 10,000, the cohesive force of the obtained pressure-sensitive adhesive sheet is low, and thus the strength of the pressure-sensitive adhesive sheet may not be sufficient, which is not preferable.
- the molecular weight is larger than 300,000, the viscosity of the photocurable transparent pressure-sensitive adhesive sheet composition becomes too high, and handling becomes difficult and workability is remarkably deteriorated.
- the weight average molecular weight in the present invention is a value obtained by using a standard polystyrene calibration curve, measured at normal temperature under the following conditions using gel permeation chromatography (Shodex GPC-101 manufactured by Showa Denko KK). is there. Column: Showa Denko LF-804 Column temperature: 40 ° C Sample: 0.2 mass% copolymer solution in tetrahydrofuran Flow rate: 1 ml / min Eluent: Tetrahydrofuran detector: RI
- the content of the (meth) acrylic group-containing polyolefin compound in the photocurable transparent adhesive sheet composition is preferably 10 to 50% by mass, and preferably 15 to 45% by mass in the composition. Is more preferable, and 20 to 40% by mass is even more preferable.
- the content is less than 10% by mass, the resulting pressure-sensitive adhesive sheet becomes brittle, which is not preferable.
- the amount is more than 50% by mass, the adhesive strength of the resulting adhesive sheet may be lowered, which is not preferable.
- the (meth) acrylic acid ester having a hydroxyl group mentioned here preferably has no carboxyl group, and examples thereof include hydroxyalkyl (meth) acrylates having an alkyl group with 2 to 7 carbon atoms.
- 2-hydroxyethyl (meth) acrylate 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 1,3-butanediol (meth) acrylate, and 1,4-butanediol (Meth) acrylate, 1,6-hexanediol (meth) acrylate, 3-methylpentanediol (meth) acrylate and the like can be exemplified, and these can be used alone or in combination of two or more.
- 2-hydroxyethyl acrylate is preferable from the viewpoint of the adhesive strength of the obtained adhesive sheet.
- the content of the (B) hydroxyl group-containing (meth) acrylic acid ester is preferably 1 to 30% by mass, more preferably 5 to 25% by mass, in the photocurable transparent adhesive sheet composition. More preferably, it is 10 to 20% by mass. If it is less than 1% by mass, the adhesiveness of the obtained pressure-sensitive adhesive sheet to the substrate is insufficient, which is not preferable. Moreover, when more than 30 mass%, the water resistance of an adhesive sheet worsens and is unpreferable.
- a photopolymerizable monomer other than the (meth) acrylic acid ester having a hydroxyl group (hereinafter sometimes referred to as “(C) photopolymerizable monomer”) is a photopolymerizable monomer. Further, it refers to other than (meth) acrylic acid ester having a hydroxyl group, and a monomer not containing a carboxyl group (chemical formula: —COOH) is preferable.
- the monomer is not particularly limited, and a monofunctional or polyfunctional photopolymerizable monomer having a vinyl group, a (meth) acryl group, or the like can be used alone or in combination of two or more.
- a (meth) acrylate compound having a (meth) acryl group is preferable.
- Alkoxyalkyl (meth) acrylates such as ethoxyethyl (meth) acrylate, methoxyethyl (meth) acrylate, butoxyethyl (meth) acrylate, 2-methoxyethoxyethyl (meth) acrylate, 2-ethoxyethoxyethyl (meth) acrylate, methoxy Fluorinated alkyl (meth) acrylates such as alkoxy (poly) alkylene glycol (meth) acrylates such as diethylene glycol (meth) acrylate, ethoxydiethylene glycol (meth) acrylate, methoxydipropylene glycol (meth) acrylate, and octafluoropentyl (meth) acrylate , N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, etc.
- (Meth) acrylate polyethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, hydroxypivalin Acid ester neopentyl glycol di (meth) acrylate, 1,3-bis (hydroxyethyl) -5,5-dimethylhydantoin di (meth) acrylate, ⁇ , ⁇ -di (meth) acrylbisdiethylene glycol phthalate, trimethylolpropane tri (Meth) acrylate, trimethylolpropane tri (meth) acrylate, ethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, poly Tylene glycol di (meth) acrylate, 1,4-butanediol di (meth)
- Epoxy group-containing (meth) acrylate and the like Epoxy group-containing (meth) acrylate and the like.
- the photopolymerizable monomer (C) of the present invention from the viewpoint of miscibility with the (meth) acrylic group-containing polyolefin compound, adhesiveness of the adhesive sheet, strength, light resistance, and heat resistance, monofunctional alkyl ( A (meth) acrylate or a cyclic alkyl (meth) acrylate is preferred.
- the monofunctional or polyfunctional functional group here refers to a (meth) acrylic group.
- the content of the photopolymerizable monomer (C) is preferably 20 to 88% by mass, more preferably 20 to 70% by mass in the photocurable transparent adhesive sheet composition. More preferably, it is 40 to 69% by mass.
- the adhesiveness of the obtained pressure-sensitive adhesive sheet to the substrate is insufficient, which is not preferable. Moreover, when more than 88 mass%, since the cohesion force of an adhesive sheet becomes low, an adhesive force becomes low and is unpreferable.
- the carboxyl group-containing monomer such as acrylic acid or methacrylic acid contained in the photopolymerizable monomer (C) is 0.1% relative to the total amount of the photopolymerizable monomer (C). It is less than or equal to mass%, more preferably less than or equal to 0.05 mass%. More preferably, the photopolymerizable monomer (C) does not contain a carboxyl group-containing monomer. When the carboxyl group-containing monomer exceeds 0.1% by mass with respect to the total amount of the photopolymerizable monomer (C), it becomes difficult to suppress corrosion of the conductive layer surface of the transparent conductive film.
- the theoretical glass transition temperature of the polymer comprising the (B) hydroxyl group-containing (meth) acrylic acid ester of the present invention and the photopolymerizable monomer (C) is 0 to 0 from the viewpoint of the strength and adhesive strength of the pressure-sensitive adhesive sheet. It is preferably 50 ° C., more preferably 5 to 45 ° C., and further preferably 10 to 40 ° C. When the temperature is lower than 0 ° C., the resulting pressure-sensitive adhesive sheet becomes too soft due to the influence of the (meth) acrylic group-containing polyolefin compound, so that the adhesive strength of the pressure-sensitive adhesive sheet is lowered, which is not preferable.
- the theoretical glass transition temperature (Tg) is the following fox (FOX) based on the Tg of the homopolymer (homopolymer) of each monomer constituting the monomer raw material and the mass fraction (copolymerization ratio) of the monomer. It can be calculated from the equation (1).
- T 1, T 2 ⁇ T n Is the glass transition temperature (absolute temperature) of the homopolymer of each monomer.
- Tg of the homopolymer a value described in the “Adhesion Technology Handbook” of Nikkan Kogyo Shimbun Co., Ltd. or “Polymer Handbook” of Wiley-Interscience, which is a publicly known material, is adopted.
- the Tg of a homopolymer of a monomer not described in the above-mentioned publicly known material the value obtained by the following method is adopted.
- a test sample is prepared by casting and drying a homopolymer solution obtained by solution polymerization of a target monomer on a release liner.
- differential scanning calorimetry was performed using a differential scanning calorimeter (DSC) at a rate of temperature increase of 10 ° C./min from ⁇ 80 ° C. to 280 ° C., and the endothermic start temperature due to glass transition. Is adopted as the Tg of the homopolymer.
- Examples of the (D) photopolymerization initiator in the present invention include a carbonyl photopolymerization initiator, a sulfide photopolymerization initiator, a quinone photopolymerization initiator, an azo photopolymerization initiator, and a sulfochloride photopolymerization initiator. Thioxanthone photopolymerization initiator, peroxide photopolymerization initiator, and the like.
- carbonyl photopolymerization initiator examples include benzophenone, benzyl, benzoin, ⁇ -bromoacetophenone, chloroacetone, acetophenone, 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, p-dimethylamino.
- Examples of the sulfide photopolymerization initiator include diphenyl disulfide, dibenzyl disulfide, tetraethylthiuram disulfide, tetramethylammonium monosulfide and the like.
- Examples of the quinone photopolymerization initiator include benzoquinone and anthraquinone.
- Examples of the azo photopolymerization initiator include azobisisobutyronitrile, 2,2′-azobispropane, hydrazine, and the like.
- Examples of the thioxanthone photopolymerization initiator include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone and the like.
- peroxide photopolymerization initiator examples include benzoyl peroxide and di-t-butyl peroxide.
- photopolymerization initiators 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1 is preferred from the viewpoint of solubility in the resulting composition for a photocurable transparent adhesive sheet. -ON is preferred.
- photoinitiators are used individually or in combination of 2 or more types.
- the content of the photopolymerization initiator is 0.2 to 5% by mass in the photocurable transparent adhesive sheet composition from the viewpoint of the balance between photocurability and the strength and adhesiveness of the resulting adhesive sheet. It is preferably 0.5 to 3% by mass, more preferably 0.8 to 2% by mass.
- the content of the photopolymerization initiator is less than 0.2% by mass, the photocuring tends to be insufficient, and when it exceeds 5% by mass, the adhesiveness of the obtained pressure-sensitive adhesive sheet tends to decrease. There is not preferable.
- the composition for a photocurable transparent pressure-sensitive adhesive sheet of the present invention is preferably 10 to 50% by mass of the component (A) and 1 to 30% by mass of the component (B) based on the total amount of the composition for the photocurable transparent pressure-sensitive adhesive sheet. %, (C) component 20 to 88% by mass, and (D) component 0.2 to 5% by mass. More preferably, the component (A) is 15 to 45% by mass, the component (B) is 5 to 25% by mass, and the component (C) is 20 to 70% by mass based on the total amount of the photocurable transparent adhesive sheet composition. And (D) component 0.2 to 5% by mass.
- the component (A) is 20 to 40% by mass
- the component (B) is 10 to 20% by mass
- the component (C) is 40 to 69% by mass with respect to the total amount of the photocurable transparent adhesive sheet composition.
- (D) component 0.5 to 3% by mass.
- a tackifier resin may be added as necessary in order not to lower the transparency in order to improve the adhesive strength of the obtained pressure-sensitive adhesive sheet.
- tackifying resins include rosin resins such as rosin and rosin esterified products; terpene resins such as diterpene polymers and ⁇ -pinene-phenol copolymers; aliphatic (C5) and aromatic ( Petroleum resin such as C9); styrene resin, phenol resin, xylene resin and the like.
- an esterified product of hydrogenated rosin or disproportionated rosin with few unsaturated double bonds, aliphatic or aromatic petroleum resin, high Tg acrylic resin, or the like is preferable to add to the adhesive sheet.
- addition amount of tackifying resin 100 mass parts of total amount of (A) component, (B) component, (C) component, and (D) component with respect to 100 mass parts of composition for photocurable transparent adhesive sheets 1 to 10 parts by mass is preferably added.
- composition for a photocurable transparent pressure-sensitive adhesive sheet of the present invention may contain various known additives as long as the transparency is not impaired.
- Additives include plasticizers, surface lubricants, leveling agents, softeners, antioxidants, antioxidants, light stabilizers, UV absorbers, polymerization inhibitors, benzotriazole-based light stabilizers, phosphate esters System and other flame retardants, and antistatic agents such as surfactants.
- composition for a photocurable transparent adhesive sheet of the present invention may be made into a solution using an organic solvent for the purpose of adjusting the viscosity at the time of coating.
- organic solvent examples include methyl ethyl ketone, acetone, ethyl acetate, tetrahydrofuran, dioxane, cyclohexanone, n-hexane, toluene, xylene, n-propanol and isopropanol. These organic solvents may be used alone or in combination of two or more.
- the acid value of the composition for a photocurable transparent adhesive sheet of the present invention is preferably 0 to 0.5 mgKOH / g, more preferably 0 to 0.1 mgKOH / g, and further preferably 0 to 0.05 mgKOH / g. .
- the acid value of the composition is a value measured according to JIS K0070. For example, measurement is performed as follows.
- composition for transparent adhesive sheet for fixing transparent conductive film is a composition for pressure-sensitive adhesive sheets for fixing a transparent conductive film comprising the above-described composition for a photocurable transparent pressure-sensitive adhesive sheet.
- any conductive layer may be used as long as it has a conductive layer on at least one surface layer.
- the transparent conductive film provided by (1) is mentioned.
- the conductive material deposited or coated in the conductive layer of the transparent conductive film is not particularly limited, and specific examples include indium tin oxide, indium oxide, tin oxide, zinc oxide, cadmium oxide, gallium oxide, and titanium oxide. It is done. Of these, indium tin oxide having excellent transparency and conductivity is preferably used.
- the substrate on which the conductive material is deposited or coated is not particularly limited, and examples thereof include glass and resin films.
- the transparent pressure-sensitive adhesive sheet for fixing a transparent conductive film of the present invention is a transparent pressure-sensitive adhesive sheet for fixing a transparent conductive film obtained by curing the above-described composition for fixing a transparent conductive film. It can be suitably bonded and the conductive layer is unlikely to corrode. Therefore, the laminated body which adhere
- the adhesive layer consists of a single layer, multiple layers may be laminated
- it is preferable that it is a double-sided adhesive sheet which does not have a base material but consists only of an adhesive layer from a viewpoint of ensuring transparency and shape followability.
- the transparent adhesive sheet for fixing a transparent conductive film of the present invention is obtained by applying a transparent adhesive sheet composition for fixing a transparent conductive film to a release PET film, and irradiating the applied composition with ultraviolet rays using an ultraviolet irradiation device or the like. It can be obtained by photocuring.
- the thickness of the transparent conductive film fixing pressure-sensitive adhesive sheet is preferably 5 to 500 ⁇ m, more preferably 10 to 300 ⁇ m. When the film thickness of the adhesive sheet for fixing a transparent conductive film becomes thinner than 5 ⁇ m, it becomes difficult to bond the adhesive sheet, and when it becomes thicker than 500 ⁇ m, it tends to be difficult to control the film thickness.
- the pressure-sensitive adhesive sheet for fixing a transparent conductive film of the present invention preferably has a gel fraction determined by the following formula (3) of 80 to 100% when immersed in toluene at room temperature for 24 hours, More preferably, it is 100%.
- the gel fraction of the pressure-sensitive adhesive sheet is lower than 80%, stringing or the like from the processed end face tends to occur during punching.
- ⁇ (Meth) acrylic group-containing polyolefin compound (A-1)> A four-necked flask equipped with a thermometer, a stirrer, a dropping funnel, and a cooling tube with a drying tube is mixed with isophorone diisocyanate 101.2 g and hydroxyl-terminated hydrogenated polybutadiene (manufactured by Nippon Soda Co., Ltd., product name: GI-3000, weight average molecular weight). 14,000) was charged at 84 ° C. and reacted at 60 ° C. When the residual isocyanate group became 1% or less, 53.9 g of 2-hydroxyethyl acrylate was charged and the temperature was raised to 70 ° C.
- ⁇ (Meth) acrylic group-containing polyolefin compound (A-4)> A four-necked flask equipped with a thermometer, a stirrer, a dropping funnel, and a cooling tube with a drying tube, 61.2 g of isophorone diisocyanate and hydrogenated polybutadiene having a hydroxyl group (Product name: GI-3000, manufactured by Nippon Soda Co., Ltd., weight average molecular weight) 14,000) was charged at 91 ° C. and reacted at 60 ° C. When the residual isocyanate group became 1% or less, 21.3 g of 2-hydroxyethyl acrylate was charged and the temperature was raised to 70 ° C. to carry out the reaction. However, it became high molecular weight and gelled during the reaction.
- Examples 1 to 6, Comparative Examples 1 to 4 Each of the compositions shown in Table 1 was blended and mixed with a disper at room temperature to prepare a uniform photocurable transparent adhesive sheet composition.
- the prepared composition for a photocurable transparent adhesive sheet is applied to a release PET film (100 mm ⁇ 100 mm ⁇ 100 ⁇ m) using an applicator so that the film thickness is 200 ⁇ m, and the upper surface is a release PET film having a thickness of 25 ⁇ m.
- the pressure-sensitive adhesive sheet having a thickness of about 200 ⁇ m sandwiched between the release PET films was obtained by irradiating with UV rays and curing under the condition of 2 .
- the composition for a photocurable transparent pressure-sensitive adhesive sheet containing the (meth) acryl group-containing polyolefin compound having a weight average molecular weight exceeding 300,000 The comparative example could not be prepared.
- the adhesive sheet obtained above was cut to a size of 50 mm ⁇ 50 mm, the release PET film having a thickness of 25 ⁇ m was peeled off, and bonded to the indium tin oxide film surface of the 100 mm ⁇ 100 mm indium tin oxide-deposited PET film.
- the electrical resistance value measuring device “Lorestar GP” manufactured by Mitsubishi Chemical Corporation was used at both ends of the bonded adhesive sheet, and the initial electrical resistance value (R 1 ) was measured.
- the indium tin oxide-deposited PET film to which the adhesive sheet was bonded was left at 90 ° C. for 500 hours and left at 23 ° C. and 50% RH for 1 hour.
- the resistance value (R 2 ) was measured.
- the increase rate of the electric resistance value of the indium tin oxide film was calculated by the following formula (4).
- the rate of increase in electrical resistance value was evaluated according to the following criteria. The results are shown in Table 1. ⁇ : Electrical resistance value increase rate of less than 5% ⁇ ; Electrical resistance value increase rate of 5 to less than 10% ⁇ : Electrical resistance value increase rate of 10% or more
- the pressure-sensitive adhesive sheet obtained above was cut to a size of 25 ⁇ 100 mm, and after removing the 100 ⁇ m-thick release PET film from the release PET film existing on both sides of the pressure-sensitive adhesive sheet, the pressure-sensitive adhesive surface (measurement surface) was tested.
- a 2 kg rubber roller (width: about 50 mm) was attached to the plate by reciprocating once to prepare a measurement sample.
- a glass plate was used as a test plate.
- the obtained measurement sample is left for 24 hours in an environment of 23 ° C.
- Total light transmittance measurement The pressure-sensitive adhesive sheet obtained above was cut into a size of 30 mm ⁇ 30 mm, and the release PET film having a thickness of 25 ⁇ m was peeled off from the release PET film existing on both sides of the pressure-sensitive adhesive sheet, and then bonded to a glass plate for measurement. A sample was used. About the sample for a measurement, the total light transmittance (%) was measured using "HR-100 type" by Murakami Color Research Laboratory. The results are shown in Table 1.
- the pressure-sensitive adhesive sheet was cut into a size of 20 mm ⁇ 40 mm to prepare a measurement sample. After this measurement sample was immersed in toluene at 23 ° C. for 24 hours, the measurement sample was taken out from toluene. Thereafter, the measurement sample was dried at 130 ° C. for 1 hour. Next, the weight of the measurement sample after drying was measured, and the gel fraction was calculated by the above-described formula (3). The results are shown in Table 1.
- the composition for the photocurable transparent adhesive sheet of the present invention obtained in the examples is superior in the electrical resistance value increase rate, the total light transmittance, and the adhesive strength as compared with the comparative example.
- composition for a photocurable transparent pressure-sensitive adhesive sheet of the present invention is useful as a pressure-sensitive adhesive sheet for fixing a transparent conductive film because it has high transparency, metal corrosion prevention and is excellent in adhesiveness. This is useful for fixing a transparent conductive film used in a touch panel of the type.
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Abstract
Description
本発明の光硬化性透明粘着シート用組成物は、(A)重量平均分子量が1万~30万である(メタ)アクリル基含有ポリオレフィン化合物、(B)ヒドロキシル基を有する(メタ)アクリル酸エステル、(C)ヒドロキシル基を有する(メタ)アクリル酸エステル以外の光重合性単量体、及び(D)光重合開始剤を含有してなる。
(メタ)アクリル基含有ポリオレフィン化合物としては、ポリオレフィン骨格を有し、さらに(メタ)アクリル基が導入されているもので有れば使用することが出来る。ポリオレフィン骨格としては、ポリエチレン、ポリプロピレン、エチレン・プロピレン共重合体、ブタジエン、イソプレン、水添ポリブタジエン、水添ポリイソプレン、シクロオレフィン等の骨格が挙げられる。耐光性、透明性(非結晶性)、作業性(液状)の点で、水添ポリブタジエン、水添ポリイソプレン骨格が好ましい。なお、(メタ)アクリル基とはCH2=CH-CO- または CH2=C(CH3)-CO-を意味する。
カラム:昭和電工製LF-804
カラム温度:40℃
試料:共重合体の0.2質量%テトラヒドロフラン溶液
流量:1ml/分
溶離液:テトラヒドロフラン
検出器:RI
ここで言うヒドロキシル基を有する(メタ)アクリル酸エステルとは、カルボキシル基を有しないものが好ましく、例えば、アルキル基の炭素数が2~7であるヒドロキシアルキル(メタ)アクリレート等が挙げられ、これらの具体例としては、2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート、1,3-ブタンジオール(メタ)アクリレート、1,4-ブタンジオール(メタ)アクリレート、1,6-ヘキサンジオール(メタ)アクリレート、3-メチルペンタンジオール(メタ)アクリレート等が例示でき、単独又は2種以上組み合わせて用いることができる。なかでも、得られる粘着シートの粘着力の点で、2-ヒドロキシエチルアクリレートが好ましい。(B)ヒドロキシル基を有する(メタ)アクリル酸エステルの含有量は、光硬化性透明粘着シート用組成物中に1~30質量%含むことが好ましく、より好ましくは5~25質量%であり、さらに好ましくは10~20質量%である。1質量%未満では、得られる粘着シートの基材への密着性が不十分となり好ましくない。また、30質量%より多い場合には、粘着シートの耐水性が悪くなり好ましくない。
(C)ヒドロキシル基を有する(メタ)アクリル酸エステル以外の光重合性単量体(以下、「(C)の光重合性単量体」ということがある。)は、光重合性単量体であって、ヒドロキシル基を有する(メタ)アクリル酸エステル以外のものを指し、カルボキシル基(化学式:-COOH)を含有しない単量体が好ましい。当該単量体としては、特に限定はなくビニル基、(メタ)アクリル基等を有する、単官能性又は多官能性光重合性単量体を単独で又は2種類以上を組み合わせて使用できる。本発明の(C)の光重合性単量体としては、例えば、(メタ)アクリル基を有する(メタ)アクリレート化合物が好ましく、例えば、メチル(メタ)アクリレート、エチル(メタ)アクリレート、n-プロピル(メタ)アクリレート、n-ブチル(メタ)アクリレート、tert-ブチル(メタ)アクリレート、イソブチル(メタ)アクリレート、2-エチルヘキシル(メタ)アクリレート、イソデシル(メタ)アクリレート、n-ヘキシル(メタ)アクリレート、ステアリル(メタ)アクリレート、ラウリル(メタ)アクリレート、トリデシル(メタ)アクリレート等のアルキル(メタ)アクリレート、シクロヘキシル(メタ)アクリレート、ノルボルニル(メタ)アクリレート、イソボルニル(メタ)アクリレート、ノルボルナニル(メタ)アクリレート、ジシクロペンテニル(メタ)アクリレート、ジシクロペンテニルオキシエチル(メタ)アクリレート、ジシクロペンタニル(メタ)アクリレート、ジシクロペンタニルオキシエチル(メタ)アクリレート、トリシクロデカンジメチロールジ(メタ)アクリレート等の環状アルキル(メタ)アクリレート等が挙げられる。エトキシエチル(メタ)アクリレート、メトキシエチル(メタ)アクリレート、ブトキシエチル(メタ)アクリレート、2-メトキシエトキシエチル(メタ)アクリレート、2-エトキシエトキシエチル(メタ)アクリレート等のアルコキシアルキル(メタ)アクリレート、メトキシジエチレングリコール(メタ)アクリレート、エトキシジエチレングリコール(メタ)アクリレート、メトキシジプロピレングリコール(メタ)アクリレート等のアルコキシ(ポリ)アルキレングリコール(メタ)アクリレート、オクタフルオロペンチル(メタ)アクリレート等のフッ素化アルキル(メタ)アクリレート、N,N-ジメチルアミノエチル(メタ)アクリレート、N,N-ジエチルアミノエチル(メタ)アクリレート等のジアルキルアミノアルキル(メタ)アクリレート、ポリエチレングリコールジ(メタ)アクリレート、ジエチレングリコールジ(メタ)アクリレート、ネオペンチルグリコールジ(メタ)アクリレート、トリエチレングリコールジ(メタ)アクリレート、トリプロピレングリコールジ(メタ)アクリレート、ヒドロキシピバリン酸エステルネオペンチルグリコールジ(メタ)アクリレート、1,3-ビス(ヒドロキシエチル)-5,5-ジメチルヒダントインジ(メタ)アクリレート、α,ω-ジ(メタ)アクリルビスジエチレングリコールフタレート、トリメチロールプロパントリ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレート、エチレングリコールジ(メタ)アクリレート、テトラエチレングリコールジ(メタ)アクリレート、ポリエチレングリコールジ(メタ)アクリレート、1,4-ブタンジオールジ(メタ)アクリレート、1,6-ヘキサンジオールジ(メタ)アクリレート、ジアクリロキシエチルフォスフェート、ジペンタエリスリトールトリヒドロキシ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレート、ペンタエリスリトールテトラ(メタ)アクリレート等の多官能性(メタ)アクリレート、アクリルアミド及びジメチルアクリルアミド、ジエチルアクリルアミド、(メタ)アクリロイルモルフォリン等のアクリルアミド誘導体、グリシジル(メタ)アクリレート等のエポキシ基含有(メタ)アクリレート等があげられる。本発明の(C)の光重合性単量体としては、(メタ)アクリル基含有ポリオレフィン化合物との混和性、粘着シートの粘着性、強度、耐光性、耐熱性の観点から、単官能アルキル(メタ)アクリレート、又は環状アルキル(メタ)アクリレートが好ましい。ここで言う単官能もしくは多官能の官能基とは、(メタ)アクリル基を指す。(C)の光重合性単量体の含有量は、光硬化性透明粘着シート用組成物中20~88質量%含むことが好ましく、より好ましくは20~70質量%である。さらに好ましくは、40~69質量%である。20質量%未満では、得られる粘着シートの基材への密着性が不十分となり好ましくない。また、88質量%より多い場合には、粘着シートの凝集力が低くなることから粘着力が低くなり好ましくない。
本発明における(D)光重合開始剤としては、例えば、カルボニル系光重合開始剤、スルフィド系光重合開始剤、キノン系光重合開始剤、アゾ系光重合開始剤、スルホクロリド系光重合開始剤、チオキサントン系光重合開始剤、過酸化物系光重合開始剤等が挙げられる。
f:0.1N水酸化カリウム-エタノール溶液のファクター
S:試料の採取量(g)
本発明の透明導電膜固定用粘着シート用組成物は、上記の光硬化性透明粘着シート用組成物からなる透明導電膜固定用粘着シート用組成物である。
本発明の透明導電膜固定用透明粘着シートは、上記の透明導電膜固定用透明粘着シート用組成物を硬化させてなる透明導電膜固定用透明粘着シートであって、透明導電膜の導電層面と好適に接着でき、かつ導電層の腐食が生じ難いものである。したがって、透明導電膜固定用透明粘着シートを透明導電膜の導電層面と接着させた積層体はタッチパネルとして好適に用いることができる。また、本発明の透明導電膜固定用透明粘着シートは、基材を有するものであっても、基材を有さず粘着剤層のみからなる両面粘着シートであってもよい。また、粘着剤層は単一層からなるものであっても複数層が積層されていてもよい。なかでも、透明性の確保や、形状追従性の観点からは、基材を有さず、粘着剤層のみからなる両面粘着シートであることが好ましい。
温度計、撹拌器、滴下ロート、乾燥管付き冷却管を備えた四つ口フラスコにイソホロンジイソシアネート101.2g及び水酸基末端水素添加ポリブタジエン(日本曹達株式会社製、製品名:GI‐3000、重量平均分子量 14,000)を844.3g仕込み、60℃で反応させ、残存イソシアネート基が1%以下となった時点で、2-ヒドロキシエチルアクリレート53.9gを仕込み70℃まで昇温して2時間反応をさせ、IR測定によりイソシアネート基が消失したことを確認した後、反応を終了し、(メタ)アクリル基含有ポリオレフィン化合物(A-1)(重量平均分子量50,000)を得た。
温度計、撹拌器、滴下ロート、乾燥管付き冷却管を備えた四つ口フラスコにイソホロンジイソシアネート152.9g及び水酸基末端水素添加ポリイソプレン(出光興産株式会社製、製品名:エポール、重量平均分子量12,000)を764.5g仕込み、60℃で反応させる。残存イソシアネート基が1%以下となった時点で、2-ヒドロキシエチルアクリレート81.7gを仕込み、70℃まで昇温して2時間反応をさせ、IR測定によりイソシアネート基が消失したことを確認した後、反応を終了し、(メタ)アクリル基含有ポリオレフィン化合物(A-2)(重量平均分子量55,000)を得た。
温度計、撹拌器、滴下ロート、乾燥管付き冷却管を備えた四つ口フラスコにイソホロンジイソシアネート246.1g及び水酸基末端水素添加ポリブタジエン(日本曹達株式会社製、製品名:GI‐1000、重量平均分子量 3,000)を618.5g仕込み、60℃で反応させ、残存イソシアネート基が1%以下となった時点で、2-ヒドロキシエチルアクリレート135.0gを仕込み70℃まで昇温して2時間反応をさせ、IR測定によりイソシアネート基が消失したことを確認した後、反応を終了し、(メタ)アクリル基含有ポリオレフィン化合物(A-3)(重量平均分子量5,000)を得た。
温度計、撹拌器、滴下ロート、乾燥管付き冷却管を備えた四つ口フラスコにイソホロンジイソシアネート61.2g及び水酸基末端水素添加ポリブタジエン(日本曹達株式会社製、製品名:GI‐3000、重量平均分子量 14,000)を917.1g仕込み、60℃で反応させ、残存イソシアネート基が1%以下となった時点で、2-ヒドロキシエチルアクリレート21.3gを仕込み70℃まで昇温して反応を行なったが、高分子量化し反応途中でゲル化してしまった。
表1に示す組成でそれぞれ配合し、室温下でディスパーを用いて混合することで均一な光硬化性透明粘着シート用組成物を調製した。調製した光硬化性透明粘着シート用組成物を、アプリケーターを用い、膜厚が200μmとなるように離型PETフィルム(100mm×100mm×100μm)に塗布し、上面を25μm厚の離型PETフィルムで覆った後、紫外線照射装置(日本電池株式会社製、UV照射装置4kw×1、出力:160W/cm、メタルハライドランプ)を用い、照射距離12cm、ランプ移動速度20m/min、照射量約500mJ/cm2の条件で紫外線を照射して硬化させ、離型PETフィルムに挟まれた膜厚が約200μmの粘着シートを得た。なお、(メタ)アクリル基含有ポリオレフィン化合物(A-4)はゲル化してしまったため、重量平均分子量が30万を超える(メタ)アクリル基含有ポリオレフィン化合物を含有する光硬化性透明粘着シート用組成物の比較例は調製することができなかった。
実施例及び比較例について、用いた(B)ヒドロキシル基を有する(メタ)アクリル酸エステル及び(C)の光重合性単量体からなるポリマーの理論ガラス転移温度を、上記式(1)から算出した。結果を表1に示す。
実施例及び比較例の光硬化性透明粘着シート用組成物の酸価を、上記の方法を用いて、式(2)により算出した。結果を表1に示す。
上で得られた粘着シートを50mm×50mmの大きさに切り取り、25μm厚の離型PETフィルムを剥がし、100mm×100mmの酸化インジウムスズ蒸着PETフィルムの酸化インジウムスズ膜面に貼り合わせた。貼り合せた粘着シートの両端に電気抵抗値測定機 三菱化学株式会社製「ロレスターGP」を使用し、初期の電気抵抗値(R1)を測定した。粘着シートを貼り合わせた酸化インジウムスズ蒸着PETフィルムを60℃、)90%RH条件下に500時間放置し、23℃、50%RH条件下に1時間放置した後、初期と同じ箇所での電気抵抗値(R2)を測定した。酸化インジウムスズ膜の電気抵抗値上昇率は下記の式(4)で算出した。
○;電気抵抗値上昇率5%未満
△;電気抵抗値上昇率5~10%未満
×;電気抵抗値上昇率10%以上
上で得られた粘着シートを25×100mmの大きさに切り取り、粘着シートの両面に存在する離型PETフィルムのうち100μm厚の離型PETフィルムを剥がした後、粘着面(測定面)を試験板に2kgのゴムローラー(幅:約50mm)を1往復させることにより貼付し、測定用サンプルを作製した。試験板としてガラス板を用いた。得られた測定用サンプルについて、23℃、湿度50%の環境下で24時間放置し、JIS Z0237に準じて、剥離速度300mm/分で180°方向の引張試験を行い、粘着シートのガラス板に対する粘着力(N/25mm)を測定した。得られた測定値を粘着力とした。結果を表1に示す。
上で得られた粘着シートを30mm×30mmの大きさに切り取り、粘着シートの両面に存在する離型PETフィルムのうち25μm厚の離型PETフィルムを剥がし、ガラス板に貼り合わせたものを測定用サンプルとした。測定用サンプルについて、株式会社村上色彩技術研究所製「HR-100型」を使用し、全光線透過率(%)を測定した。結果を表1に示す。
粘着シートを20mm×40mmの大きさに切り取り、測定用サンプルを作製した。この測定用サンプルをトルエン中に23℃で24時間浸漬した後、測定用サンプルをトルエンから取り出した。その後、測定用サンプルを130℃で1時間乾燥した。次に、乾燥後の測定用サンプルの重量を測定し、上述した式(3)によりゲル分率を算出した。結果を表1に示す。
Claims (11)
- (A)重量平均分子量が1万~30万である(メタ)アクリル基含有ポリオレフィン化合物、(B)ヒドロキシル基を有する(メタ)アクリル酸エステル、(C)ヒドロキシル基を有する(メタ)アクリル酸エステル以外の光重合性単量体、及び(D)光重合開始剤を含有してなる光硬化性透明粘着シート用組成物であって、(C)ヒドロキシル基を有する(メタ)アクリル酸エステル以外の光重合性単量体に含まれるカルボキシル基含有単量体が(C)ヒドロキシル基を有する(メタ)アクリル酸エステル以外の光重合性単量体の全量に対して、0.1質量%以下であることを特徴とする光硬化性透明粘着シート用組成物。
- 光硬化性透明粘着シート用組成物の全量に対して、(A)重量平均分子量が1万~30万である(メタ)アクリル基含有ポリオレフィン化合物10~50質量%、(B)ヒドロキシル基を有する(メタ)アクリル酸エステル1~30質量%、(C)ヒドロキシル基を有する(メタ)アクリル酸エステル以外の光重合性単量体20~88質量%、及び(D)光重合開始剤0.2~5質量%を含有してなることを特徴とする請求項1記載の光硬化性透明粘着シート用組成物。
- (C)ヒドロキシル基を有する(メタ)アクリル酸エステル以外の光重合性単量体がカルボキシル基含有単量体を含まないことを特徴とする請求項1又は2記載の光硬化性透明粘着シート用組成物。
- (B)ヒドロキシル基を有する(メタ)アクリル酸エステル、及び(C)ヒドロキシル基を有する(メタ)アクリル酸エステル以外の光重合性単量体を重合して得られるポリマーの理論ガラス転移温度が0℃~50℃であることを特徴とする請求項1~3のいずれかに記載の光硬化性透明粘着シート用組成物。
- (C)ヒドロキシル基を有する(メタ)アクリル酸エステル以外の光重合性単量体が単官能アルキル(メタ)アクリレート、及び/又は環状アルキル(メタ)アクリレートであることを特徴とする請求項1~4のいずれかに記載の光硬化性透明粘着シート用組成物
- (A)重量平均分子量が1万~30万である(メタ)アクリル基含有ポリオレフィン化合物が、ポリオレフィンポリオール化合物、ヒドロキシル基を有する(メタ)アクリレート、及び1分子中にイソシアネート基を2個以上有する化合物を反応させて得られる(メタ)アクリル基を有する化合物であることを特徴とする請求項1~5のいずれかに記載の光硬化性透明粘着シート用組成物。
- 酸価が0.5mgKOH/g以下であることを特徴とする請求項1~6のいずれかに記載の光硬化性透明粘着シート用組成物。
- 請求項1~7のいずれか記載の光硬化性透明粘着シート用組成物を硬化させて得られる光硬化性透明粘着シートが透明導電膜の貼り合せに使用されることを特徴とする透明導電膜固定用透明粘着シート用組成物。
- 請求項8記載の透明導電膜固定用透明粘着シート用組成物を硬化させて得られることを特徴とする透明導電膜固定用透明粘着シート。
- ゲル分率が80~100%であることを特徴とする請求項9記載の透明導電膜固定用透明粘着シート。
- 請求項9又は10記載の透明導電膜固定用透明粘着シートが、透明導電膜の導電層面に接着されていることを特徴とする積層体。
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| JPWO2019139016A1 (ja) * | 2018-01-09 | 2021-01-21 | 東亞合成株式会社 | 接着剤組成物、並びにそれを用いた電池用材料、リチウムイオン電池用材料、熱融着性部材、及びリチウムイオン電池用包装材料 |
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| EP3924439A4 (en) * | 2019-02-11 | 2022-09-14 | Henkel AG & Co. KGaA | LIGHT-CURING (METH)ACRYLATE RESIN COMPOSITION FOR BONDING THERMOPLASTIC ELASTOMERS |
| US12024574B2 (en) | 2019-02-11 | 2024-07-02 | Henkel Ag & Co. Kgaa | Light curable (meth)acrylate resin composition for thermoplastic elastomers bonding |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103108930B (zh) | 2014-08-20 |
| KR20130056340A (ko) | 2013-05-29 |
| TW201213482A (en) | 2012-04-01 |
| JP5854404B2 (ja) | 2016-02-09 |
| KR101494984B1 (ko) | 2015-02-23 |
| TWI515281B (zh) | 2016-01-01 |
| CN103108930A (zh) | 2013-05-15 |
| JPWO2012035958A1 (ja) | 2014-02-03 |
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