WO2013115250A1 - 光硬化性透明粘着シート用組成物、光学用粘着シート - Google Patents
光硬化性透明粘着シート用組成物、光学用粘着シート Download PDFInfo
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- WO2013115250A1 WO2013115250A1 PCT/JP2013/052045 JP2013052045W WO2013115250A1 WO 2013115250 A1 WO2013115250 A1 WO 2013115250A1 JP 2013052045 W JP2013052045 W JP 2013052045W WO 2013115250 A1 WO2013115250 A1 WO 2013115250A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
-
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6204—Polymers of olefins
- C08G18/6208—Hydrogenated polymers of conjugated dienes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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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
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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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
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C09J175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
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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
-
- 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
-
- 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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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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
- 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
Definitions
- the present invention relates to a photocurable transparent adhesive sheet composition, an optical adhesive sheet obtained by curing a photocurable transparent adhesive sheet composition, an optical adhesive sheet used for fixing a transparent resin plate, and a transparent conductive film.
- TECHNICAL FIELD The present invention relates to an optical pressure-sensitive adhesive sheet used for fixing a film, a touch panel using the optical pressure-sensitive adhesive sheet, and an image display device using the optical pressure-sensitive adhesive sheet.
- a resistive touch panel that detects mainly the pressure at the time of input
- a capacitive touch panel that detects the input location by static electricity from the human body at the time of input.
- the conductive layer surface of a transparent conductive film such as ITO (indium tin oxide) is fixed so as to be in contact with the adhesive layer surface of the adhesive sheet.
- ITO indium tin oxide
- the adhesive sheet for fixing a transparent conductive film is required to have high metal corrosion prevention properties.
- a pressure-sensitive adhesive sheet having a metal corrosion prevention property As a pressure-sensitive adhesive sheet having a metal corrosion prevention property, a pressure-sensitive adhesive sheet containing a metal corrosion inhibitor (for example, see Patent Document 1) has been proposed. Moreover, the adhesive sheet (for example, refer patent document 2) which reduced the corrosivity with respect to a transparent conductive film by containing the nitrogen atom containing component of a specific amount 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.
- a monomer having a high glass transition temperature (Tg) or a monomer containing a functional group such as a carboxyl group is copolymerized.
- Tg glass transition temperature
- a monomer containing a functional group such as a carboxyl group is copolymerized.
- a pressure-sensitive adhesive composition excellent in adhesiveness and foam resistance to plastics at normal and high temperatures comprising a polymer containing a carboxyl group-containing monomer as a constituent and an oligomer containing an amino group-containing monomer as a constituent (for example, a patent Document 3) is known.
- this pressure-sensitive adhesive composition is a pressure-sensitive adhesive composition containing a carboxyl group-containing polymer and has a problem that it cannot be used for laminating a transparent conductive film due to an acid component.
- this pressure-sensitive adhesive composition is excellent in resistance to foaming at high temperatures, there is a problem that the pressure-sensitive adhesive sheet is whitened under high temperature and high humidity.
- the problem to be solved by the present invention is that the conductive layer is not corroded even if directly bonded to the conductive layer surface of the transparent conductive film, and further, when used for fixing a transparent resin plate such as an acrylic plate or a polycarbonate plate
- Another object of the present invention is to provide a composition for a photocurable transparent pressure-sensitive adhesive sheet excellent in foam resistance and whitening resistance under a high-temperature and high-humidity environment, and further a pressure-sensitive adhesive sheet.
- the present inventors have a high molecular weight and hydrogenation in which a (meth) acryloyl group is introduced.
- the composition for photocurable transparent adhesive sheet containing alicyclic tackifier resin and photopolymerization initiator is transparent, adhesive, metal corrosion prevention of transparent conductive film, anti-foaming when fixing transparent resin plate And the whitening resistance under high temperature and high humidity was found to be satisfactory, and the present invention was completed based on this finding.
- the present invention is shown by the following (1) to (9).
- composition for a photocurable transparent adhesive sheet according to (1) wherein the acid value is 0 to 5 mgKOH / g.
- composition for a photocurable transparent adhesive sheet according to any one of (1) and (2), wherein the weight average molecular weight of the (E) alicyclic tackifying resin is 500 to 1500.
- composition for a photocurable transparent adhesive sheet according to any one of (1) to (5), wherein the polyfunctional isocyanate compound is a hydrogenated diphenylmethane diisocyanate or isophorone diisocyanate.
- An optical pressure-sensitive adhesive sheet obtained by curing the photocurable transparent pressure-sensitive adhesive sheet composition according to any one of (1) to (6).
- the composition for a photocurable transparent adhesive sheet of the present invention contains a hydrogenated 1,2-polybutadiene compound or a hydrogenated isoprene compound having a high molecular weight and a (meth) acryloyl group introduced therein. Therefore, an adhesive sheet excellent in flexibility, adhesiveness, cohesive force, moisture permeability resistance, and water resistance can be obtained. Moreover, since the alicyclic tackifying resin having a softening point in a specific range is contained in the composition, foaming when the transparent resin plates are bonded together under high temperature and high humidity can be suppressed.
- the content of the carboxyl group in the composition to a predetermined amount or less, corrosion of the conductive layer surface of the transparent conductive film due to the acid component can be suppressed, and the (meth) acrylic acid ester having a hydroxyl group in the composition can be suppressed.
- the amount within a specific range whitening of the pressure-sensitive adhesive sheet under high humidity can be prevented. Therefore, by using the pressure-sensitive adhesive sheet of the present invention, the visibility under high temperature and high humidity becomes good and can be suitably used for a touch panel.
- Hydrogenated 1,2-polybutadiene refers to a hydrogen atom reacted with a double bond portion (—CH ⁇ CH—) of 1,2-polybutadiene to be converted to a single bond (—CH 2 —CH 2 —). .
- the (A) (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or (meth) acryloyl group-containing hydrogenated polyisoprene compound of the present invention comprises a hydrogenated 1,2-polybutadiene polyol or a hydrogenated polyisoprene polyol, It can be obtained by reacting a polyfunctional isocyanate compound and then reacting the remaining hydroxyl group or isocyanate group with a (meth) acryloyl group and a compound having an isocyanate group or hydroxyl group.
- Examples of the synthesis method of (A) (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or (meth) acryloyl group-containing hydrogenated polyisoprene compound include the following two-stage reactions.
- the (meth) acryloyl group means CH 2 ⁇ CH—CO— or CH 2 ⁇ C (CH 3 ) —CO—.
- the two-step reaction as the first example is as follows. First, a polyfunctional isocyanate compound having two or more isocyanate groups in one molecule with respect to hydrogenated 1,2-polybutadiene polyol or hydrogenated polyisoprene polyol (hereinafter sometimes referred to as “polyfunctional isocyanate compound”). Is reacted at a ratio in which the amount of isocyanate groups is larger than the amount of hydroxyl groups to synthesize a urethane prepolymer having an isocyanate group with an extended chain length.
- the molecular weight can be adjusted by adjusting the hydroxyl group amount of the hydrogenated 1,2-polybutadiene polyol or hydrogenated polyisoprene polyol and the isocyanate group amount of the polyfunctional isocyanate compound.
- a (meth) acrylate having a hydroxyl group in the obtained urethane prepolymer a hydroxyalkyl (meth) acrylate or a (meth) acrylate monool derived from various polyols (with one hydroxyl group remaining, various polyols ( (A) a (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or a (meth) acryloyl group by reacting (meth) acrylate) and converting the remaining isocyanate group to a (meth) acryloyl group A hydrogenated polyisoprene compound is obtained.
- hydroxyalkyl (meth) acrylate examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 1,3-butanediol (meth) acrylate, Examples thereof include 1,4-butanediol (meth) acrylate, 1,6-hexanediol (meth) acrylate, 3-methylpentanediol (meth) acrylate and the like, and these can be used alone or in combination of two or more. Of these, 2-hydroxyethyl acrylate is preferred in terms of reactivity with isocyanate groups and photocurability.
- the (meth) acryloyl group content can be adjusted by reacting the alkyl alcohol with an isocyanate group.
- the saturated alcohol that can be used is not particularly limited, and one or more linear, branched, and alicyclic alkyl alcohols can be used.
- the two-step reaction as the second example is as follows. First, a polyfunctional isocyanate compound is reacted with hydrogenated 1,2-polybutadiene polyol or hydrogenated polyisoprene polyol at a ratio in which the amount of hydroxyl groups is greater than the amount of isocyanate groups to synthesize a polyurethane compound having a hydroxyl group with an extended chain length. To do. At this time, the molecular weight can be adjusted by adjusting the hydroxyl group amount of the hydrogenated 1,2-polybutadiene polyol or hydrogenated polyisoprene polyol and the isocyanate group amount of the polyfunctional isocyanate compound.
- an isocyanate group-containing (meth) acrylate is reacted with the obtained polyurethane compound to obtain a (A) (meth) acrylate group-containing polyolefin compound.
- the content of the (meth) acryloyl group can be adjusted by adjusting the amount of the isocyanate group-containing (meth) acrylate to be reacted with the remaining hydroxyl group.
- the isocyanate group-containing (meth) acrylate a commercially available compound may be used, or a hydroxyalkyl (meth) acrylate or (meth) acrylate monool derived from various polyols and a diisocyanate compound are reacted to form an isocyanate group at one end, What synthesized the isocyanate group containing (meth) acrylate which has a (meth) acryloyl group in the other terminal may be used.
- the isocyanate group-containing (meth) acrylate include 2-isocyanatoethyl (meth) acrylate and 1,1-bis (acryloyloxymethyl) ethyl isocyanate. Of these, 2-isocyanatoethyl acrylate is preferred from the viewpoints of reactivity with hydroxyl groups and photocurability.
- the two-step reaction in the above two examples is a reaction between a hydroxyl group and an isocyanate group, and a general urethane such as dibutyltin dilaurate or dibutyltin diethylhexoate in the presence of an organic solvent inert to the isocyanate group.
- the reaction is usually carried out at 30 to 100 ° C. for about 1 to 5 hours using the catalyst.
- the amount of the urethanization catalyst used is usually 50 to 500 ppm based on the total mass of the raw materials used for the reaction.
- the hydrogenated 1,2-polybutadiene polyol or hydrogenated polyisoprene polyol used in the present invention preferably has a number average molecular weight of 500 to 5000, and more preferably 1000 to 4000.
- the number average molecular weight is smaller than 500, the number of urethane bonds in the (A) (meth) acryloyl group-containing hydrogenated polybutadiene compound or (meth) acryloyl group-containing hydrogenated polyisoprene compound is too large, so the yellowing resistance is poor. There is a possibility.
- the phase of (A) (meth) acryloyl group-containing hydrogenated polybutadiene compound or (meth) acryloyl group-containing hydrogenated polyisoprene compound and (meth) acrylic acid ester having a hydroxyl group The solubility tends to deteriorate, which is not preferable.
- the hydroxyl value of the hydrogenated 1,2-polybutadiene polyol or hydrogenated polyisoprene polyol is preferably 10 to 200 mgKOH / g, more preferably 15 to 100 mgKOH / g, and preferably 25 to 75 mgKOH / g. Further preferred.
- Specific examples of commercially available hydrogenated 1,2-polybutadiene polyols that can be used in the present invention include products manufactured by Nippon Soda Co., Ltd., product names: GI-1000, GI-2000, GI-3000 (number average molecular weight is About 1500, about 2100, and about 3000), respectively.
- Specific examples of commercially available hydrogenated polyisoprene polyols include Idemitsu Kosan Co., Ltd. product name Epol (number average molecular weight of about 2500).
- Examples of the polyfunctional isocyanate compound used in the present invention include diisocyanate compounds such as tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, and hydrogenated products thereof, hexamethylene diisocyanate, trimethyl hexaxane.
- diisocyanate compounds such as methylene diisocyanate, tetramethylxylylene diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexyl diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, and norbornane diisocyanate.
- isophorone diisocyanate or hydrogenated diphenylmethane diisocyanate is preferred 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 (A) (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or (meth) acryloyl group-containing hydrogenated polyisoprene compound of the present invention comprises a hydrogenated 1,2-polybutadiene polyol or a hydrogenated polyisoprene polyol, It is preferably obtained by reacting a polyfunctional isocyanate compound to increase the molecular weight, and then introducing 80 to 100 mol% of (meth) acryloyl groups with respect to the remaining hydroxyl groups or isocyanate groups. More preferably, 90 to 100 mol% of (meth) acryloyl group is introduced with respect to the remaining hydroxyl group or isocyanate group.
- the ratio of introducing the (meth) acryloyl group is less than 80 mol%, the cohesive force of the obtained pressure-sensitive adhesive sheet becomes small, and when the pressure-sensitive adhesive sheet is bonded to a transparent resin plate, the foam resistance may deteriorate. There is sex.
- the weight average molecular weight of the (A) (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or the (meth) acryloyl group-containing hydrogenated polyisoprene compound is 50,000 to 200,000, preferably 60,000 to 150,000. More preferably, it is 70,000 to 100,000.
- the molecular weight can be adjusted by adjusting the amounts of the hydrogenated 1,2-polybutadiene polyol or hydrogenated polyisoprene polyol and the polyfunctional isocyanate compound.
- the weight average molecular weight is less than 50,000, the cohesive force of the obtained pressure-sensitive adhesive sheet is small, and when the pressure-sensitive adhesive sheet is bonded to a transparent resin plate, the strength of the foam-resistant pressure-sensitive adhesive sheet may not be sufficient.
- the molecular weight is larger than 200,000, the viscosity of the photocurable transparent pressure-sensitive adhesive sheet composition becomes too high, and handling becomes difficult and workability is remarkably deteriorated.
- the value of the weight average molecular weight in the present invention is measured at normal temperature using gel permeation chromatography (Shodex GPC-101 manufactured by Showa Denko KK) at the following conditions, and is calculated in terms of polystyrene. Is. Column: Showa Denko LF-804 Column temperature: 40 °C Sample: 0.2 mass% copolymer solution in tetrahydrofuran Flow rate: 1 ml / min Eluent: Tetrahydrofuran
- the content of the (A) (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or the (meth) acryloyl group-containing hydrogenated polyisoprene compound is 25 to 45% by mass in the photocurable transparent adhesive sheet composition. It is preferably 28 to 40% by mass, and more preferably 30 to 35% by mass.
- the content of (A) (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or (meth) acryloyl group-containing hydrogenated polyisoprene compound in the composition for photocurable transparent adhesive sheet is less than 25% by mass
- the water resistance at high temperature and high humidity may deteriorate, and the foam resistance may deteriorate.
- the content of (A) (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or (meth) acryloyl group-containing hydrogenated polyisoprene compound in the photocurable transparent adhesive sheet composition is more than 45% by mass. In some cases, the adhesive strength of the resulting adhesive sheet may be reduced.
- the (meth) acrylic acid ester having a hydroxyl group preferably has no carboxyl group, and examples thereof include hydroxyalkyl (meth) acrylates having an alkyl group with 2 to 7 carbon atoms. Specific examples thereof include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 1,3-butanediol (meth) acrylate, 1,4-butane.
- Examples include diol (meth) acrylate, 1,6-hexanediol (meth) acrylate, and 3-methylpentanediol (meth) acrylate, which can be used alone or in combination of two or more.
- the carbon number of the alkyl group of the (meth) acrylic acid ester having a hydroxyl group is preferably 1 to 6, and more preferably 2 to 4. Of these, 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 8 to 20% by mass, preferably 9 to 18% by mass, more preferably 10%, in the photocurable transparent adhesive sheet composition. To 15% by mass.
- the content of (B) hydroxyl group-containing (meth) acrylic acid ester in the photocurable transparent adhesive sheet composition is less than 8% by mass, the adhesiveness of the resulting adhesive sheet to the substrate becomes insufficient. In some cases, the pressure-sensitive adhesive sheet may be whitened under high humidity. Moreover, when the content of the (B) hydroxyl group-containing (meth) acrylic acid ester in the photocurable transparent adhesive sheet composition is more than 20% by mass, the water resistance of the adhesive sheet may be deteriorated. is there.
- (C) Polymerizable monomer other than (meth) acrylic acid ester having hydroxyl group) (C) A polymerizable monomer other than the (meth) acrylic acid ester having a hydroxyl group (hereinafter sometimes referred to as “(C) polymerizable monomer”) is a photopolymerizable monomer.
- the (B) component other than the (meth) acrylic acid ester having a hydroxyl group is preferably a monomer that does not contain a carboxyl group (chemical formula: —COOH).
- the monomer is not particularly limited, and monofunctional or polyfunctional photopolymerizable monomers having a vinyl group, a (meth) acryloyl group, or the like can be used alone or in combination of two or more.
- the monofunctional or polyfunctional functional group here refers to a vinyl group or a (meth) acryloyl group.
- Examples of the polymerizable monomer (C) of the present invention include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, and tert-butyl (meth).
- Alkyl such as acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, n-hexyl (meth) acrylate, stearyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate (Meth) acrylate, cyclohexyl (meth) acrylate, norbornyl (meth) acrylate, isobornyl (meth) acrylate, norbornanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyl Kishiechiru (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentanyl oxyethyl (meth) acrylate, tricyclodecane dimethylol di (meth) cyclic alkyl acrylates
- 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, ethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, 1,4 Multi-functionality such as butanediol di (meth) acrylate, 1,6-hexanedi
- the polymerizable monomer (C) of the present invention miscibility with (A) (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or (meth) acryloyl group-containing hydrogenated polyisoprene compound, Alkyl (meth) acrylate or cyclic alkyl (meth) acrylate is preferred from the viewpoints of the tackiness, strength, light resistance and heat resistance of the pressure-sensitive adhesive sheet.
- the content of the polymerizable monomer (C) is 20 to 61.8% by mass, preferably 30 to 55% by mass, more preferably 35 to 35% by mass in the photocurable transparent adhesive sheet composition. 50% by mass.
- the adhesiveness of the resulting adhesive sheet to the substrate may be insufficient.
- the content of the polymerizable monomer (C) in the photocurable transparent adhesive sheet composition is more than 61.8% by mass, the cohesive force of the obtained adhesive sheet becomes small, and the adhesive sheet becomes When bonded to a transparent resin plate, the strength of the foam-resistant pressure-sensitive adhesive sheet may not be sufficient.
- the theoretical glass transition temperature of the copolymer obtained by copolymerizing only the (B) hydroxyl group-containing (meth) acrylate ester and the polymerizable monomer (C) of the present invention is the strength of the adhesive sheet, adhesion From the viewpoint of force, it is preferably 0 to 50 ° C., more preferably 5 to 45 ° C., and further preferably 10 to 40 ° C.
- the temperature is lower than 0 ° C., the pressure-sensitive adhesive sheet obtained is too soft due to the influence of the (A) (meth) acryloyl group-containing polyolefin compound, and thus 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 obtained by polymerizing monomers not described in the above-mentioned publicly known materials 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.
- (D) photopolymerization initiators 1-hydroxy-cyclohexyl-phenyl-ketone is preferred from the viewpoint of solubility in the resulting composition for a photocurable transparent adhesive sheet.
- These (D) photopolymerization initiators are used alone or in combination of two or more.
- 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.
- the content is 0.5 to 3% by mass, and more preferably 0.8 to 2% by mass.
- the content of the (D) photopolymerization initiator in the photocurable transparent adhesive sheet composition is less than 0.2% by mass, the photocuring tends to be insufficient.
- the content of the (D) photopolymerization initiator in the composition for a photocurable transparent adhesive sheet exceeds 5% by mass, the adhesiveness of the obtained adhesive sheet tends to decrease.
- (E) Alicyclic tackifying resin having a softening point of 90 to 150 ° C. tackifying resins are called tackifiers, and have the function of bringing out tackiness when mixed with polymers (elastomers) typified by various types of plastics and rubber.
- the alicyclic tackifying resin means a tackifying resin made of a cyclic hydrocarbon resin having no unsaturated bond (double bond or triple bond).
- the (E) alicyclic tackifying resin having a softening point of 90 to 150 ° C. of the present invention includes an unsaturated group having a softening point of 90 to 150 ° C.
- the range of the softening point is more preferably 95 to 145 ° C, still more preferably 100 to 140 ° C.
- the softening point is lower than 90 ° C., the heat resistance of the pressure-sensitive adhesive sheet at high temperatures is insufficient, and the foam resistance may be deteriorated when the pressure-sensitive adhesive sheet is bonded to the transparent resin plate.
- the softening point is higher than 150 ° C., the solubility in (meth) acrylic acid ester tends to be low.
- the weight average molecular weight of the (E) cycloaliphatic tackifier resin of the present invention is preferably 500-1500. More preferably, it is 1000 to 1400.
- Alicyclic tackifier resins include rosin and rosin derivative hydrogenated resins, polyterpene resin hydrogenated resins, aromatic modified terpene resin hydrogenated resins, terpene phenol resin hydrogenated resins, coumarone indene resins Hydrogenated resin, alicyclic petroleum resin hydrogenated resin, aromatic petroleum resin hydrogenated resin, aliphatic aromatic copolymer petroleum resin hydrogenated resin, dicyclopentadiene petroleum resin hydrogenated resin Examples thereof include hydrogenated resins of dicyclopentadiene aromatic copolymer, and hydrogenated resins of low molecular weight polymers of styrene or substituted styrene. From the viewpoint of heat resistance and light resistance, terpene hydrogenated resins may be used. preferable.
- An alicyclic tackifier resin can be used individually or in combination of 2 or more types.
- the content of the alicyclic tackifying resin is 5 to 20% by mass in the photocurable transparent adhesive sheet composition from the viewpoint of balance between photocurability and the strength and adhesiveness of the resulting adhesive sheet.
- the amount is preferably 7 to 15% by mass, more preferably 9 to 11% by mass.
- content of alicyclic tackifying resin is less than 5 mass%, there exists a possibility that the adhesiveness of an adhesive sheet may become inadequate. When it exceeds 20% by mass, the tackiness of the obtained pressure-sensitive adhesive sheet tends to be too high, and the handleability tends to be lowered.
- composition for a photocurable transparent adhesive sheet of the present invention comprises (A) a (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or (meth) based on the total amount of the photocurable transparent adhesive sheet composition.
- (A) (meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound or (meth) acryloyl group-containing hydrogenated polyisoprene compound 28 is used with respect to the total amount of the photocurable transparent adhesive sheet composition.
- -40 mass% (B) 9-18 mass% of (meth) acrylic acid ester having a hydroxyl group, (C) 30-55 mass% of polymerizable monomer other than (meth) acrylic acid ester having a hydroxyl group, (D) 0.5 to 3% by mass of a photopolymerization initiator and (E) 7 to 15% by mass of an alicyclic tackifying resin.
- the acid value of the composition for a photocurable transparent adhesive sheet of the present invention is preferably 0 to 5 mgKOH / g, more preferably 0 to 0.5 mgKOH / g, and still more preferably 0 to 0.1 mgKOH / g.
- the acid value of the composition for photocurable transparent adhesive sheets in this case is the value measured based on JISK0070. For example, measurement is performed as follows.
- 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 optical pressure-sensitive adhesive sheet of the present invention is an optical pressure-sensitive adhesive sheet used for optical applications obtained by curing the composition for a photocurable transparent pressure-sensitive adhesive sheet. More specifically, it is used for applications for bonding optical members (for optical member bonding), optical product manufacturing applications, and the like. Moreover, even if it has a base material, the double-sided adhesive sheet which does not have a base material but consists only of an adhesive layer may be sufficient as the adhesive sheet for optics of this invention.
- it is a member which has an optical characteristic as an optical member,
- the member used for an image display apparatus, a touchscreen, or these apparatuses is mentioned, For example, a polarizing plate, phase difference, etc. Plate, optical compensation film, brightness enhancement film, light guide plate, reflection film, antireflection film, transparent conductive film, design film, decorative film, surface protection film, prism, lens, color filter, transparent substrate, and these are laminated
- the member currently made is mentioned.
- the optical pressure-sensitive adhesive sheet can be obtained by applying a photocurable transparent pressure-sensitive adhesive sheet composition to a release film, and irradiating the applied composition with ultraviolet rays using an ultraviolet irradiation device or the like to cause photocuring.
- the film thickness of the optical pressure-sensitive adhesive sheet is preferably 5 to 500 ⁇ m, more preferably 10 to 400 ⁇ m, and even more preferably 15 to 300 ⁇ m. When the film thickness of the optical pressure-sensitive adhesive sheet is thinner than 5 ⁇ m, it tends to be difficult to bond the pressure-sensitive adhesive sheet. When the film thickness of the optical pressure-sensitive adhesive sheet is thicker than 500 ⁇ m, it tends to be difficult to control the film thickness.
- a known coating method can be used for coating (coating) in the method for forming an optical pressure-sensitive adhesive sheet of the present invention.
- Conventional coaters such as gravure roll coaters, reverse roll coaters, kiss roll coaters Dip roll coaters, bar coaters, knife coaters, spray coaters, comma coaters, direct coaters and the like can be used.
- the surface (adhesive surface) of the optical pressure-sensitive adhesive sheet of the present invention may be protected by a release film (separator) until use.
- each adhesive surface (both surfaces) of the adhesive sheet may be protected by two release films, respectively, or is wound into a roll by one release film having both surfaces as release surfaces. It may be protected with.
- the release film is used as a protective material for the pressure-sensitive adhesive layer, and is peeled off when attached to an adherend.
- the release film is not necessarily provided.
- a commonly used release film can be used, and is not particularly limited. Examples thereof include a plastic film surface-treated with a release agent such as silicone, long-chain alkyl, or fluorine.
- the release film can be formed by a known method.
- the thickness of the release film is not particularly limited, and the thicknesses of the two release films may be the same or different.
- different types of release films may be used, and the releasability can be controlled by changing the rigidity.
- An optical pressure-sensitive adhesive sheet (an optical pressure-sensitive adhesive sheet for fixing a resin plate) used for fixing a transparent resin plate of the present invention is an optical pressure-sensitive adhesive sheet obtained by curing the above-described composition for a photocurable transparent pressure-sensitive adhesive sheet. It is.
- Optical adhesive sheet for fixing transparent resin plates can be used for fixing (meth) acrylic resin, polycarbonate resin, polyethylene terephthalate resin, etc. used in protective panels such as image display devices and touch panels. The foam resistance at the bottom can be suppressed. Therefore, the laminated body which adhere
- the optical pressure-sensitive adhesive sheet (transparent conductive film-fixing pressure-sensitive adhesive sheet) used for fixing the transparent conductive film in the present invention is an optical pressure-sensitive adhesive sheet obtained by curing the above-described composition for a photocurable transparent pressure-sensitive adhesive sheet. .
- the pressure-sensitive adhesive sheet for fixing a transparent conductive film can be suitably bonded to the conductive layer surface of the transparent conductive film, and the conductive layer is hardly corroded. Therefore, a laminate in which the transparent conductive film fixing sheet is bonded to the conductive layer surface of the transparent conductive film can be suitably used as a touch panel.
- the sheet for fixing a transparent conductive film of the present invention may have a base material or a double-sided pressure-sensitive adhesive sheet having only a pressure-sensitive adhesive layer without having a base material.
- the adhesive layer consists of a single layer, multiple layers may be laminated
- the transparent conductive film used for the transparent conductive film fixing pressure-sensitive adhesive sheet of the present invention is not limited as long as it has a conductive layer on at least one surface layer, and the conductive material is provided on the surface layer of the transparent substrate by vapor deposition or coating.
- Transparent conductive film 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 optical pressure-sensitive adhesive sheet of the present invention is particularly preferably used for bonding members constituting a touch panel and an image display device.
- the image display device include a liquid crystal display device, an organic EL (electroluminescence) display device, a PDP (plasma display panel), and electronic paper.
- ⁇ (Meth) acryloyl group-containing hydrogenated 1,2-polybutadiene compound (A-4)> A four-necked flask equipped with a thermometer, a stirrer, a dropping funnel, and a cooling tube with a drying tube was charged with 2 moles of isophorone diisocyanate and hydroxyl-terminated hydrogenated polybutadiene (manufactured by Nippon Soda Co., Ltd., product name: GI-3000, hydroxyl value 25 mgKOH / 1 g of g) was charged and reacted at 60 ° C. for 4 hours to obtain isocyanate group-terminated hydrogenated polybutadiene.
- Examples 1-7, Comparative Examples 1-10 Each of the compositions shown in Table 1 and Table 2 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.
- an irradiation distance of 12 cm After covering, using an ultraviolet irradiation device (UV irradiation device 4 kw ⁇ 1, manufactured by Nippon Battery Co., Ltd., output: 160 W / cm, metal halide lamp), an irradiation distance of 12 cm, a lamp moving speed of 20 m / min, and an irradiation amount of about 1000 mJ / cm 2
- an irradiation distance of 12 cm After covering, using an ultraviolet irradiation distance of 12 cm, a lamp moving speed of 20 m / min, and an irradiation amount of about 1000 mJ / cm 2
- the adhesive sheet obtained above is cut into a size of 50 mm ⁇ 50 mm, the release PET film having a thickness of 25 ⁇ m is 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 is bonded is allowed to stand for 500 hours at 60 ° C. and 90% RH, and left for 1 hour under conditions of 23 ° C. and 50% RH.
- the 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 (3).
- the rate of increase in electrical resistance value was evaluated according to the following criteria. The results are shown in Tables 1 and 2. ⁇ : 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 into a size of 25 mm ⁇ 100 mm, and the 25 ⁇ m-thick release PET film of the release PET film existing on both sides of the pressure-sensitive adhesive sheet was peeled off, and then a 50 ⁇ m-thick PET film ( A “Lumirror S-10” manufactured by Toray Industries, Inc. was lined (attached) to produce a strip-shaped sheet piece.
- the adhesive surface was attached to the test plate by reciprocating a 2 kg rubber roller (width: about 50 mm) once. A measurement sample was prepared.
- a glass plate was used as a test plate.
- the obtained measurement sample is left for 24 hours in an environment of 23 ° C. and 50% humidity, and subjected to a tensile test in the 180 ° direction at a peeling rate of 300 mm / min in accordance with JIS Z0237, to the glass sheet of the pressure-sensitive adhesive sheet.
- the adhesive strength (N / 25 mm) was measured.
- the obtained measured value was defined as adhesive strength.
- 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 Tables 1 and 2.
- 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.
- the configuration of the measurement sample is “glass plate / adhesive sheet / release PET film”.
- the sample was stored in an environment of 60 ° C. and 95% RH for 120 hours, and the appearance of the sample immediately after taking out in an environment of 23 ° C. and 50% RH (after 0 hour) was visually confirmed. The case where no white turbidity was observed visually was evaluated as ⁇ (good whitening resistance), and the case where white turbidity was observed was evaluated as x (poor whitening resistance).
- the composition for the photocurable transparent adhesive sheet of the present invention obtained in the Examples is higher in electrical resistance value, total light transmittance, It turns out that it is excellent in adhesive force and foaming peeling resistance.
- composition for a photo-curable transparent adhesive sheet of the present invention is for fixing a transparent conductive film because it is excellent in high transparency, adhesiveness, metal corrosion prevention, anti-foaming peeling property in high temperature and high humidity environment, and whitening resistance. It is useful as an adhesive sheet and is suitably used for fixing a transparent resin plate and a transparent conductive film used for a capacitive touch panel.
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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)水素添加1,2-ポリブタジエンポリオール又は水素添加ポリイソプレンポリオールと、多官能イソシアネート化合物を反応させ、残存する水酸基又はイソシアネート基(-N=C=O)と、(メタ)アクリロイル基及び、イソシアネート基又は水酸基を有する化合物を反応させて得られる重量平均分子量が5万~20万である(メタ)アクリロイル基含有水素添加1,2-ポリブタジエン化合物又は(メタ)アクリロイル基含有水素添加ポリイソプレン化合物25~45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8~20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重合性単量体20~61.8質量%、(D)光重合開始剤0.2~5質量%、及び(E)軟化点が90~150℃である脂環式粘着付与樹脂5~20質量%を含有してなる光硬化性透明粘着シート用組成物である。以下、各成分について説明する。
水素添加1,2-ポリブタジエンとは、1,2-ポリブタジエンの二重結合部分(-CH=CH-)に水素を反応させて単結合(-CH2-CH2-)に変えたものをいう。水素添加ポリイソプレンについても同様である。本発明の(A)(メタ)アクリロイル基含有水素添加1,2-ポリブタジエン化合物又は(メタ)アクリロイル基含有水素添加ポリイソプレン化合物は、水素添加1,2-ポリブタジエンポリオール又は水素添加ポリイソプレンポリオールと、多官能イソシアネート化合物を反応させ、次いで、残存する水酸基又はイソシアネート基に、(メタ)アクリロイル基及び、イソシアネート基又は水酸基を有する化合物を反応させることで得ることが出来る。
カラム:昭和電工株式会社製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
(B)ヒドロキシル基を有する(メタ)アクリル酸エステルとしては、カルボキシル基を有さ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る。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。(B)ヒドロキシル基を有する(メタ)アクリル酸エステルのアルキル基の炭素数としては1~6が好ましく、2~4がより好ましい。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8~20質量%であり、好ましくは9~18質量%であり、より好ましくは10~15質量%である。光硬化性透明粘着シート用組成物中における(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が8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ることや高湿下で粘着シートが白化してしまうことがある。また、光硬化性透明粘着シート用組成物中における(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が20質量%より多い場合には、粘着シートの耐水性が悪くなる可能性がある。
(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重合性単量体(以下、「(C)の重合性単量体」ということがある。)は、光重合性単量体であって、(B)成分である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す。(C)の重合性単量体は、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)アクリロイル基等を有する、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。ここで言う単官能もしくは多官能の官能基とは、ビニル基又は(メタ)アクリロイル基を指す。本発明の(C)の重合性単量体としては、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、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、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)の重合性単量体としては、(A)(メタ)アクリロイル基含有水素添加1,2-ポリブタジエン化合物、又は(メタ)アクリロイル基含有水素添加ポリイソプレ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、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。(C)の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20~61.8質量%であり、好ましくは30~55質量%であり、より好ましくは、35~50質量%である。光硬化性透明粘着シート用組成物における(C)の重合性単量体の含有量が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ることがある。また、光硬化性透明粘着シート用組成物における(C)の重合性単量体の含有量が61.8質量%より多い場合には、得られる粘着シートの凝集力が小さくなり、粘着シートが透明樹脂板に貼り合せられた場合に耐発泡性粘着シートの強度が十分でない可能性がある。
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。
一般的に粘着付与樹脂は、タッキファイヤーと呼ばれ、いろいろな種類のプラスチックスやゴムに代表される高分子(エラストマー)に混ぜると粘着性を引き出す働きがある。中でも、脂環式粘着付与樹脂とは、不飽和結合(二重結合や三重結合)を持たない環状炭化水素樹脂からなる粘着付与樹脂を意味する。本発明の(E)軟化点が90~150℃である脂環式粘着付与樹脂としては、JIS K-2207に定められた環球法に基づく軟化点が90~150℃である不飽和基を含まない樹脂であることが好ましい。より好ましい軟化点の範囲としては、95~145℃であり、さらに好ましくは100~140℃である。軟化点が90℃より低い場合には、高温時の粘着シートの耐熱性が不十分となり粘着シートが透明樹脂板に貼り合せられた場合に耐発泡性が悪くなる可能性がある。軟化点が150℃より高い場合には、(メタ)アクリル酸エステルへの溶解性が低くなる傾向にある。
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)
本発明の光学用粘着シートは、上記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学用途に用いられる光学用粘着シートである。より具体的には、光学部材を貼り合わせる用途(光学部材貼り合わせ用)や光学製品の製造用途などに用いられる。また、本発明の光学用粘着シートは、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。光学部材としては、光学的特性を有する部材であれば、特に限定されないが、例えば、画像表示装置、タッチパネルを構成する部材又はこれらの機器に用いられる部材が挙げられ、例えば、偏光板、位相差板、光学補償フィルム、輝度向上フィルム、導光板、反射フィルム、反射防止フィルム、透明導電フィルム、意匠フィルム、装飾フィルム、表面保護フィルム、プリズム、レンズ、カラーフィルター、透明基板や、さらにはこれらが積層されている部材が挙げられる。
本発明の、透明樹脂板の固定に使用される光学用粘着シート(樹脂板固定用光学用粘着シート)は、上記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学用粘着シートである。透明樹脂板固定用光学用粘着シートは、画像表示装置、タッチパネル等の保護パネルに使用される(メタ)アクリル樹脂、ポリカーボネート樹脂、ポリエチレンテレフタレート樹脂等の固定に用いることができ、高温、高湿環境下での耐発泡性をおさえることが出来る。したがって、透明樹脂板固定用光学用粘着シートを透明樹脂板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。
本発明における透明導電膜の固定に使用される光学用粘着シート(透明導電膜固定用粘着シート)は、上記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学用粘着シートである。透明導電膜固定用粘着シートは、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。本発明の透明導電膜固定用粘着シートが使用される透明導電膜としては、少なくとも片面の表層に導電層を有するものであればよく、透明基材の表層に導電物質が蒸着やコーティングにより設けられた透明導電膜を挙げられる。透明導電膜の導電層において蒸着やコーティングされる導電物質は、特に限定されないが、具体的には、酸化インジウムスズ、酸化インジウム、酸化スズ、酸化亜鉛、酸化カドミウム、酸化ガリウム、酸化チタンなどが挙げられる。なかでも、透明性、導電性に優れる酸化インジウムスズが好適に用いられる。透明導電膜において、導電物質が蒸着またはコーティングされる基材としては、特に限定されるものではないが、ガラス、樹脂フィルムなどが挙げられる。
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15モル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、水酸基価25mgKOH/g)を14モル仕込み、60℃で4時間反応させ、イソシアネート基末端水素添加ポリブタジエンを得た。これに2-ヒドロキシエチルアクリレート2モルを仕込み、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)アクリロイル基含有水素添加1,2-ポリブタジエン化合物(A-1)(重量平均分子量70,000)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14モル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、水酸基価25mgKOH/g)を15モル仕込み、60℃で反応させ、残存イソシアネート基が0.1%以下となった時点で、2-イソシアネートエチルアクリレート2モルを仕込み、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)アクリロイル基含有水素添加1,2-ポリブタジエン化合物(A-2)(重量平均分子量70,000)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14モル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、水酸基価40mgKOH/g)を13モル仕込み、60℃で4時間反応させ、イソシアネート基末端水素添加ポリイソプレンを得た。これに2-ヒドロキシエチルアクリレート2モルを仕込み、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)アクリロイル基含有水素添加ポリイソプレン化合物(A-3)(重量平均分子量80,000)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2モル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、水酸基価25mgKOH/g)を1モル仕込み、60℃で4時間反応させ、イソシアネート基末端水素添加ポリブタジエンを得た。これに2-ヒドロキシエチルアクリレート2モルを仕込み、70℃まで昇温し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)アクリロイル基含有水素添加1,2-ポリブタジエン化合物(A-4)(重量平均分子量7,000)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31モル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、水酸基価25mgKOH/g)を29モル仕込み、60℃で4時間反応させ、イソシアネート基末端水素添加ポリブタジエンを得た。これに2-ヒドロキシエチルアクリレート2モルを仕込み、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及び表2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1000mJ/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。
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及び表2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を行う。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(3)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25mm×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25μm厚の離型PETフィルムを剥がした後、厚さ50μm厚のPETフィルム(東レ株式会社製、「ルミラーS-10」)を裏打ち(貼り付け)し、短冊状のシート片を作成した。次いで、上の短冊状シートの片面の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及び表2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及び表2に示す。
100mm×100mmの光学用PETフィルム(東洋紡績株式会社製、コスモシャインA4100)の易接着面と、厚さ1mmのポリカーボネート板(三菱ガス化学株式会社社製、ユーピロンシートMR-58)とを上で得られた粘着シートで貼りあわせた後、オートクレーブ(サクラ精機株式会社製、TAC-200)にて40℃、0.5MPaの条件で10分間脱泡処理したものを測定用サンプルとした。これを60℃、湿度90%の条件で500時間放置し、目視で粘着層界面の発泡や剥がれの外観欠点を評価した。
○;発泡なし
△;直径1mm未満の発泡有り
×;直径1mm以上の発泡有り
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。測定用サンプルの構成は「ガラス板/粘着シート/離型PETフィルム」という構成である。60℃、95%RHの環境下に120時間保存し、23℃、50%RHの環境下に取り出した直後(0時間後)のサンプルの外観を目視で確認した。目視で白濁が認められなかった場合を○(耐白化性良好)、白濁が認められた場合を×(耐白化性不良)として評価を行った。
Claims (11)
- (A)水素添加1,2-ポリブタジエンポリオール又は水素添加ポリイソプレンポリオールと、多官能イソシアネート化合物を反応させ、残存する水酸基又はイソシアネート基と、(メタ)アクリロイル基及び、イソシアネート基又は水酸基を有する化合物を反応させて得られる重量平均分子量が5万~20万である(メタ)アクリロイル基含有水素添加1,2-ポリブタジエン化合物又は(メタ)アクリロイル基含有水素添加ポリイソプレン化合物25~45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8~20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重合性単量体20~61.8質量%、(D)光重合開始剤0.2~5質量%、及び(E)軟化点が90~150℃である脂環式粘着付与樹脂5~20質量%を含有してなる光硬化性透明粘着シート用組成物。
- 酸価が0~5mgKOH/gである請求項1に記載の光硬化性透明粘着シート用組成物。
- (E)脂環式粘着付与樹脂の重量平均分子量が500~1500である請求項1又は2のいずれかに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重合性単量体を共重合して得られる共重合体の理論ガラス転移温度が0℃~50℃である請求項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。
- (メタ)アクリロイル基及び、イソシアネート基又は水酸基を有する化合物が、ヒドロキシアルキル(メタ)アクリレート又はイソシアネート基含有(メタ)アクリレートである請求項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。
- 多官能イソシアネート化合物が、ジフェニルメタンジイソシアネートの水素添加物又はイソホロンジイソシアネートである請求項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。
- 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を硬化させて得られる光学用粘着シート。
- 透明樹脂板の固定に使用される請求項7に記載の光学用粘着シート。
- 透明導電膜の固定に使用される請求項7に記載の光学用粘着シート。
- 請求項7に記載の光学用粘着シートを用いたタッチパネル。
- 請求項7に記載の光学用粘着シートを用いた画像表示装置。
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JP6031049B2 (ja) | 2016-11-24 |
KR101627445B1 (ko) | 2016-06-03 |
TWI592456B (zh) | 2017-07-21 |
CN104093800A (zh) | 2014-10-08 |
JPWO2013115250A1 (ja) | 2015-05-11 |
TW201402752A (zh) | 2014-01-16 |
KR20140126725A (ko) | 2014-10-31 |
CN104093800B (zh) | 2016-01-20 |
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