WO2022145370A1 - 硬化性接着剤組成物及び偏光板 - Google Patents
硬化性接着剤組成物及び偏光板 Download PDFInfo
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- WO2022145370A1 WO2022145370A1 PCT/JP2021/048235 JP2021048235W WO2022145370A1 WO 2022145370 A1 WO2022145370 A1 WO 2022145370A1 JP 2021048235 W JP2021048235 W JP 2021048235W WO 2022145370 A1 WO2022145370 A1 WO 2022145370A1
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- meth
- acrylate
- adhesive composition
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- mass
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- YLQWCDOCJODRMT-UHFFFAOYSA-N fluoren-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3C2=C1 YLQWCDOCJODRMT-UHFFFAOYSA-N 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- VANNPISTIUFMLH-UHFFFAOYSA-N glutaric anhydride Chemical group O=C1CCCC(=O)O1 VANNPISTIUFMLH-UHFFFAOYSA-N 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 235000019382 gum benzoic Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- VLCAYQIMSMPEBW-UHFFFAOYSA-N methyl 3-hydroxy-2-methylidenebutanoate Chemical compound COC(=O)C(=C)C(C)O VLCAYQIMSMPEBW-UHFFFAOYSA-N 0.000 description 1
- 125000004492 methyl ester group Chemical group 0.000 description 1
- YLHXLHGIAMFFBU-UHFFFAOYSA-N methyl phenylglyoxalate Chemical compound COC(=O)C(=O)C1=CC=CC=C1 YLHXLHGIAMFFBU-UHFFFAOYSA-N 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 229920000847 nonoxynol Polymers 0.000 description 1
- OTLDLKLSNZMTTA-UHFFFAOYSA-N octahydro-1h-4,7-methanoindene-1,5-diyldimethanol Chemical compound C1C2C3C(CO)CCC3C1C(CO)C2 OTLDLKLSNZMTTA-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 150000002903 organophosphorus compounds Chemical class 0.000 description 1
- QNGNSVIICDLXHT-UHFFFAOYSA-N para-ethylbenzaldehyde Natural products CCC1=CC=C(C=O)C=C1 QNGNSVIICDLXHT-UHFFFAOYSA-N 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- QIWKUEJZZCOPFV-UHFFFAOYSA-N phenyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC1=CC=CC=C1 QIWKUEJZZCOPFV-UHFFFAOYSA-N 0.000 description 1
- WRAQQYDMVSCOTE-UHFFFAOYSA-N phenyl prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1 WRAQQYDMVSCOTE-UHFFFAOYSA-N 0.000 description 1
- LYXOWKPVTCPORE-UHFFFAOYSA-N phenyl-(4-phenylphenyl)methanone Chemical compound C=1C=C(C=2C=CC=CC=2)C=CC=1C(=O)C1=CC=CC=C1 LYXOWKPVTCPORE-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- KNCYXPMJDCCGSJ-UHFFFAOYSA-N piperidine-2,6-dione Chemical group O=C1CCCC(=O)N1 KNCYXPMJDCCGSJ-UHFFFAOYSA-N 0.000 description 1
- PMJHHCWVYXUKFD-UHFFFAOYSA-N piperylene Natural products CC=CC=C PMJHHCWVYXUKFD-UHFFFAOYSA-N 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920001610 polycaprolactone Polymers 0.000 description 1
- 239000004632 polycaprolactone Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 150000004053 quinones Chemical class 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000012508 resin bead Substances 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- JDVPQXZIJDEHAN-UHFFFAOYSA-N succinamic acid Chemical group NC(=O)CCC(O)=O JDVPQXZIJDEHAN-UHFFFAOYSA-N 0.000 description 1
- RINCXYDBBGOEEQ-UHFFFAOYSA-N succinic anhydride Chemical group O=C1CCC(=O)O1 RINCXYDBBGOEEQ-UHFFFAOYSA-N 0.000 description 1
- 239000002335 surface treatment layer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- SJMYWORNLPSJQO-UHFFFAOYSA-N tert-butyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(C)(C)C SJMYWORNLPSJQO-UHFFFAOYSA-N 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
- ILLKMACMBHTSHP-UHFFFAOYSA-N tetradecaethylene glycol Chemical compound OCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO ILLKMACMBHTSHP-UHFFFAOYSA-N 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 229920006352 transparent thermoplastic Polymers 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 150000007964 xanthones Chemical class 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1811—C10or C11-(Meth)acrylate, e.g. isodecyl (meth)acrylate, isobornyl (meth)acrylate or 2-naphthyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1818—C13or longer chain (meth)acrylate, e.g. stearyl (meth)acrylate
-
- 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
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/10—Esters
- C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
- C08F222/106—Esters of polycondensation macromers
- C08F222/1063—Esters of polycondensation macromers of alcohol terminated polyethers
-
- 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
- C08F279/00—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00
- C08F279/02—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00 on to polymers of conjugated dienes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
- C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C08L101/06—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
- C08L101/08—Carboxyl groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L57/00—Compositions of unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C08L57/02—Copolymers of mineral oil hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
-
- 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
- C09J109/00—Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
- C09J201/02—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C09J201/06—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
- C09J201/08—Carboxyl groups
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
Definitions
- the present invention relates to a curable adhesive composition and a polarizing plate.
- a polarizing plate widely used in an image display device such as a liquid crystal display device or an organic EL display device usually has a structure in which a thermoplastic resin film such as a protective film is bonded to one side or both sides of a polarizing element.
- An adhesive is usually used for bonding the splitter and the thermoplastic resin film.
- an active energy ray-curable adhesive and a water-based adhesive are known [for example, Japanese Patent Application Laid-Open No. 2009-008660 (Patent Document 1)].
- the present invention provides the curable adhesive composition and the polarizing plate shown below.
- [1] Contains maleic anhydride-modified compound (A), (meth) acrylate compound (B) and photopolymerization initiator (C).
- the (meth) acrylate compound (B) contains a monofunctional (meth) acrylate compound (B-1).
- the monofunctional (meth) acrylate compound (B-1) is a curable adhesive composition containing an alicyclic alkyl (meth) acrylate compound and a linear or branched C4 -C 36 alkyl (meth) acrylate compound. ..
- the content of the monofunctional (meth) acrylate compound (B-1) is 60% by mass or more and 99% by mass or less in 100% by mass of the (meth) acrylate compound (B) according to [1].
- the content of the alicyclic alkyl (meth) acrylate compound is the total amount of the alicyclic alkyl (meth) acrylate compound and the linear or branched C4 -C 36 alkyl (meth) acrylate compound.
- the curable adhesive composition according to [1] or [2] which is 5% by mass or more and 80% by mass or less in 100% by mass.
- the adhesive layer is a polarizing plate which is a cured product layer of the curable adhesive composition according to any one of [1] to [8]. [10] The polarizing plate according to [9], wherein the thermoplastic resin film is a (meth) acrylic resin film.
- the polarizing plate refers to a laminated optical film including a polarizing element and a thermoplastic resin film laminated on one side or both sides thereof.
- the polarizing element and the thermoplastic resin film are laminated via an adhesive layer.
- the adhesive layer is a layer formed from the adhesive composition, and more specifically, a cured product layer of the adhesive composition.
- the polarizing plate may include a polarizing element and a film or layer other than the above-mentioned thermoplastic resin film.
- the above-mentioned maleic anhydride structure means the following structure. (* Indicates a bond to the main chain.)
- the polybutadiene may be 1,4-polybutadiene, 1,2-polybutadiene, a structural unit formed by 1,4-addition and a structural unit formed by 1,2-addition. May include both.
- the 1,4-addition may be a trans addition or a cis addition.
- the number average molecular weight of the maleic anhydride-modified polymer (A-1) is usually 500 or more and 15,000 or less, preferably 600 or more and 12,000 or less, and more preferably 700 or more and 10,000 or less from the viewpoint of viscosity and coatability. It is more preferably 2000 or more and 10000 or less.
- the number average molecular weight of the maleic anhydride-modified polymer (A-1) can be measured as a standard polystyrene-equivalent value by gel permeation chromatography (GPC).
- the (meth) acrylate compound (B) is a radically polymerizable compound having one or more (meth) acryloyloxy groups in the molecule.
- the adhesive composition may contain one or more (meth) acrylate compounds (B).
- the monofunctional (meth) acrylate compound (B-1) include, for example, Aralkyl (meth) acrylates such as benzyl (meth) acrylates, 2-phenoxyethyl (meth) acrylates, phenoxyethylene glycol (meth) acrylates, 2-hydroxy-3-phenoxypropyl (meth) acrylates, ethoxylated-o-
- the bifunctional (meth) acrylate (B-2) has moisture permeability of the cured product, compatibility with the maleic anhydride-modified compound (A), and adhesion with a thermoplastic resin film (particularly (meth) acrylic resin film). From the viewpoint of the above, it is preferable to include the compound represented by the following formula, and more preferably the compound represented by the following formula.
- O-acyloxym compound examples include N-benzoyloxy-1- (4-phenylsulfanylphenyl) butane-1-on-2-imine and N-benzoyloxy-1- (4-phenylsulfanylphenyl) octane-1-.
- the alkylphenone compound is a compound having a partial structure represented by the following formula (d4) or a partial structure represented by the following formula (d5).
- the benzene ring may have a substituent.
- Benzoin compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether;
- Benzophenone o-Methyl benzoyl benzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyldiphenylsulfide, 3,3', 4,4'-tetra (tert-butylperoxycarbonyl) benzophenone, 2,4 Benzophenone compounds such as 6-trimethylbenzophenone, 4,4'-di (N, N'-dimethylamino) -benzophenone;
- Xanthone compounds such as 2-isopropylthioxanthone and 2,4-diethylthioxanthone;
- Anthracene compounds such as 9,10-dimethoxyanthracene, 2-ethyl-9,10-
- the content of the photopolymerization initiator (C) is usually It is 0.1% by mass or more and 20% by mass or less, preferably 0.5% by mass from the viewpoint of curability of the adhesive composition and the adhesive ability of the adhesive composition to the thermoplastic resin film (or layer). It is 15% by mass or less, more preferably 1% by mass or more and 10% by mass or less (for example, 8% by mass or less).
- Unmodified polybutadiene (D) The adhesive composition can further include unmodified polybutadiene (D). Further inclusion of the unmodified polybutadiene (D) in the adhesive composition may be advantageous from the viewpoint of the adhesive ability of the adhesive composition and the moist heat durability of the polarizing plate using the polyvinyl alcohol-based polarizing element.
- Unmodified polybutadiene (D) is unmodified polybutadiene, which is a polymer obtained by addition polymerization of 1,3-butadiene. Not modified means that the side chain does not contain reactive or polar groups.
- the adhesive composition may contain one type of unmodified polybutadiene or may contain two or more types of unmodified polybutadiene.
- the unmodified polybutadiene (D) may be 1,4-polybutadiene, 1,2-polybutadiene, or a structural unit (1,4-addition unit) formed by 1,4-addition. ) And the structural units formed by 1,2-addition (1,2-addition units) may be included.
- the 1,4-addition may be a trans addition or a cis addition.
- the number average molecular weight of the unmodified polybutadiene (D) is usually 500 or more and 15,000 or less, preferably 600 or more and 10,000 or less, more preferably 700 or more and 9000 or less, still more preferably, from the viewpoint of viscosity and coatability. Is 1000 or more and 5000 or less.
- the number average molecular weight of unmodified polybutadiene (D) can be measured as a standard polystyrene conversion value by GPC.
- the content of unmodified polybutadiene (D) is usually 1% by mass or more and 20% by mass or less when the total amount of the adhesive composition is 100% by mass.
- the adhesive ability of the adhesive composition to the thermoplastic resin film (or layer) particularly when a polyvinyl alcohol-based decoder is used as the polarizing element, between the polyvinyl alcohol-based polarizing element and the thermoplastic resin film. From the viewpoint of enhancing the adhesiveness, it is preferably 2% by mass or more and 18% by mass or less, and more preferably 3% by mass or more and 15% by mass or less.
- the total amount of the maleic anhydride-modified compound (A) and the unmodified polybutadiene (D) is usually set when the total amount of the adhesive composition is 100% by mass. 4% by mass or more and 60% by mass or less, and from the viewpoint of the adhesive ability of the adhesive composition to the thermoplastic resin film (or layer), particularly when a polyvinyl alcohol-based polarizing element is used as the polarizing element, the polyvinyl alcohol-based polarizing element From the viewpoint of enhancing the adhesion between the and the thermoplastic resin film, it is preferably 5% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 40% by mass or less, and further preferably 15% by mass or more. It is 30% by mass or less.
- the unmodified polybutadiene (D) when the adhesive composition contains the unmodified polybutadiene (D), the unmodified polybutadiene (when the total amount of the anhydrous maleic acid-modified compound (A) and the unmodified polybutadiene (D) in the adhesive composition is 100% by mass, the unmodified polybutadiene ( The content of D) is usually 5% by mass or more and 65% by mass or less, and from the viewpoint of the adhesive ability of the adhesive composition to the thermoplastic resin film (or layer), in particular, a polyvinyl alcohol-based polarizing element is used as the substituent.
- it is preferably 10% by mass or more and 60% by mass or less, and more preferably 20% by mass or more and 50% by mass or less, from the viewpoint of enhancing the adhesion between the polyvinyl alcohol-based polarizing element and the thermoplastic resin film. ..
- the adhesive composition contains unmodified polybutadiene (D), male anhydride-modified when the total amount of the anhydrous maleic acid-modified compound (A) and the unmodified polybutadiene (D) in the adhesive composition is 100% by mass.
- the content of the compound (A) is determined from the viewpoint of the adhesive ability of the adhesive composition to the thermoplastic resin film (or layer), particularly when a polyvinyl alcohol-based polarizing element is used as the polarizing element, the polyvinyl alcohol-based polarizing element and the heat. From the viewpoint of enhancing the adhesion with the plastic resin film, it is preferably 40% by mass or more and 90% by mass or less, and more preferably 50% by mass or more and 80% by mass or less.
- the adhesive composition may further contain a tackifier.
- the tackifier resin is not particularly limited and may be appropriately selected from known ones.
- a rosin derivative for example, rosin, polymerized rosin, hydrogenated rosin
- a terpene-based resin for example, terpene resin, aromatic modification
- Terpene resin, terpene phenol resin, hydrogenated terpene resin petroleum resin, phenol-based resin, xylene-based resin and the like can be mentioned.
- the adhesive composition further contains the petroleum resin (E).
- the adhesiveness can be improved and the moisture permeability of the cured film formed from the adhesive composition can be reduced.
- the adhesive composition capable of forming a cured film having low moisture permeability is suitable for applications in which it is required to suppress the inflow and outflow of water through the cured film.
- a polarizing plate in which a thermoplastic resin film is laminated on at least one surface of a polarizing element via an adhesive layer or an image display panel including the polarizing plate, if the adhesive layer has low moisture permeability, the moisture content is reduced. It is possible to suppress curl (warp) of the polarizing plate or the image display panel caused by entering and exiting.
- Further inclusion of the petroleum resin (E) in the adhesive composition may be advantageous in improving the adhesion between the substituent and the thermoplastic resin film.
- the petroleum resin (E) may be a C5-based petroleum resin obtained by copolymerizing the above-mentioned C5 fraction, a hydrogenated C5-based petroleum resin, or a modified resin. good. Further, it may be an alicyclic hydrocarbon resin obtained by polymerizing the C5 fraction after cyclization dimerization. Examples of the alicyclic hydrocarbon-based resin include polymers containing a structural unit derived from dicyclopentadiene.
- the moisture permeability of the cured film formed from the adhesive composition is preferably low.
- a cured film having a thickness of 10 ⁇ m made of an adhesive composition has a moisture permeation measured at a temperature of 40 ° C. and a relative humidity of 90% by the cup method specified in JIS Z 0208, preferably 400 g / (m 2 ). 24 hr) or less, more preferably 300 g / ( m 2.24 hr) or less, still more preferably 200 g / (m 2.24 hr) or less.
- the water permeability is usually 1 g / ( m 2.24 hr) or more, for example, 5 g / ( m 2.24 hr) or more.
- the (meth) acrylic resin film having a thickness of 60 ⁇ m is used as the base film
- the (meth) acrylic resin film and a cured film having a thickness of 10 ⁇ m made of an adhesive composition are laminated.
- the body has a water permeability measured by the cup method specified in JIS Z 0208 under the conditions of a temperature of 40 ° C. and a relative humidity of 90%, preferably 55 g / ( m 2.24 hr) or less, more preferably. It is 50 g / ( m 2.24 hr) or less.
- the water permeability is usually 1 g / ( m 2.24 hr) or more, for example, 5 g / ( m 2.24 hr) or more.
- Viscosity of Adhesive Composition The viscosity of the adhesive composition at 25 ° C. is preferably 10,000 mPa ⁇ sec or less, more preferably 2 mPa ⁇ sec or more and 7,000 mPa ⁇ sec or less, and 300 mPa ⁇ sec or more and 5000 mPa or more. -It is more preferably sec or less.
- the viscosity of the adhesive composition at 25 ° C. can be measured by an E-type viscometer.
- the adhesive composition according to the present invention is suitable for adhering a thermoplastic resin film, and can be used, for example, for laminating a thermoplastic resin film and another thermoplastic resin film (or layer).
- An example of application of the adhesive composition according to the present invention is for a polarizing plate, that is, it can be used for producing a polarizing plate. More specifically, the adhesive composition according to the present invention is useful as an adhesive composition used for bonding a polarizing element and a thermoplastic resin film such as a protective film laminated on the polarizing element.
- the polarizing plate according to the present invention includes a polarizing element and a thermoplastic resin film laminated on at least one surface thereof via an adhesive layer formed from the adhesive composition.
- the adhesive layer is a cured product layer of the adhesive composition.
- the polarizing plate according to the present invention since the polarizing element and the thermoplastic resin film are adhered to each other by using the above-mentioned adhesive composition, the adhesion between the polarizing element and the thermoplastic resin film can be improved, and the adhesion can be improved. , The wet and heat durability of the polarizing plate can be improved. That is, according to the present invention, it is possible to provide a polarizing plate having good adhesion between the polarizing element and the thermoplastic resin film even after being placed in a moist heat environment.
- the polarizing plate according to the present invention can be suitably used for an image display device such as a liquid crystal display device and an organic EL device.
- the polarizing plate according to the present invention can include the polarizing element 30, the first adhesive layer 15, and the first thermoplastic resin film 10 in this order, that is, the polarizing element 30 and its plurality. It can include a first thermoplastic resin film 10 laminated and bonded via the first adhesive layer 15 on one surface. It is preferable that the first adhesive layer 15 and the first thermoplastic resin film 10 are in direct contact with each other. It is preferable that the splitter 30 and the first adhesive layer 15 are in direct contact with each other.
- the polarizing plate has the first adhesive layer 15 and the second adhesive layer 25
- either one may be formed from the adhesive composition according to the present invention, or both adhesive layers may be the present. It may be formed from the adhesive composition according to the invention.
- the adhesive layer formed from the adhesive composition according to the present invention is preferably an adhesive layer on the visual side (an adhesive layer far from the adhesive layer described later).
- these adhesive compositions may have the same composition or different compositions.
- the polarizing plate according to the present invention may include a layer (or film) other than the above.
- the other layer include a pressure-sensitive adhesive layer laminated on the outer surface of the first thermoplastic resin film 10, the second thermoplastic resin film 20 and / or the polarizing element 30; and a separate layer laminated on the outer surface of the pressure-sensitive adhesive layer.
- Film also referred to as "release film”
- Protective film laminated on the outer surface of the first thermoplastic resin film 10, the second thermoplastic resin film 20 and / or the polarizing element 30 also referred to as "surface protective film”
- Examples thereof include an optically functional film (or layer) laminated on the outer surface of the first thermoplastic resin film 10, the second thermoplastic resin film 20 and / or the polarizing element 30 via an adhesive layer or an adhesive layer. ..
- the polarizing element 30 is not limited to the absorption type polarizing element, but is a reflective polarizing element that selectively transmits linear polarization in one direction from natural light and reflects the linear polarization in the other direction, or linear polarization in the other direction.
- a scattering type polarizing element may be used, but an absorption type polarizing element is preferable from the viewpoint of excellent visibility when the polarizing plate is applied to an image display device or the like.
- the polarizing element 30 is more preferably a polyvinyl alcohol-based polarizing element composed of a polyvinyl alcohol-based resin, and a dichroic dye such as iodine or a dichroic dye is adsorbed and oriented on the polyvinyl alcohol-based resin film.
- polyvinyl alcohol-based polarizing element it is more preferable that it is a polyvinyl alcohol-based polarizing element, and it is particularly preferable that it is a polyvinyl alcohol-based polarizing element in which iodine is adsorbed and oriented on a polyvinyl alcohol-based resin film.
- the polyvinyl alcohol-based polarizing element can be produced by a conventionally known method using a polyvinyl alcohol-based resin film (or layer).
- the thickness of the splitter 30 can be 30 ⁇ m or less, preferably 25 ⁇ m or less (for example, 20 ⁇ m or less, further 15 ⁇ m or less, further 10 ⁇ m or less, further 8 ⁇ m or less).
- the thickness of the splitter 30 is usually 2 ⁇ m or more. Reducing the thickness of the polarizing element 30 is advantageous for reducing the thickness of the polarizing plate and, by extension, the image display device to which the polarizing plate 30 is applied.
- Thermoplastic resin film The first thermoplastic resin film 10 and the second thermoplastic resin film 20 are each translucent (preferably optically transparent) thermoplastic resin, for example, a chain polyolefin resin.
- a chain polyolefin resin Polyethylene resin, polypropylene resin, etc.), cyclic polyolefin resin (norbornen resin, etc.) and other polyolefin resins; triacetyl cellulose, diacetyl cellulose and other cellulose ester resins; polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, etc.
- the first thermoplastic resin film 10 and the second thermoplastic resin film 20 may be either an unstretched film or a uniaxially or biaxially stretched film, respectively.
- the biaxial stretching may be simultaneous biaxial stretching in which the two stretching directions are simultaneously stretched, or sequential biaxial stretching in which the stretching is performed in the first direction and then in a different second direction.
- the first thermoplastic resin film 10 and / or the second thermoplastic resin film 20 may be a protective film that plays a role of protecting the polarizing element 30, or is a protective film that also has an optical function such as a retardation film. You can also do it.
- an arbitrary retardation value was given by stretching a film made of the thermoplastic resin (uniaxial stretching or biaxial stretching, etc.) or forming a liquid crystal layer or the like on the thermoplastic resin film. It can be a retardation film.
- the (meth) acrylic resin can be, for example, a polymer containing a methacrylic acid ester as a main monomer (containing 50% by mass or more), and the methacrylic acid ester and other copolymerization components are copolymerized with each other. It is preferably a copolymer.
- the (meth) acrylic resin comprises methyl methacrylate as a copolymerization component, or comprises methyl methacrylate and methyl acrylate.
- Examples of the copolymerization component other than methyl acrylate include ethyl methacrylate, n-, i- or t-butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, 2-ethylhexyl methacrylate and methacrylic acid.
- a polyfunctional monomer may be used as the above-mentioned other copolymerization component.
- the polyfunctional monomer include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, and nonaethylene glycol di (meth).
- Ethylene glycol such as acrylate, tetradecaethylene glycol di (meth) acrylate, or the hydroxyl groups at both ends of the oligomer are esterified with (meth) acrylic acid; Esterification of both end hydroxyl groups of propylene glycol or its oligomers with (meth) acrylic acid; A hydroxyl group of a dihydric alcohol such as neopentyl glycol di (meth) acrylate, hexanediol di (meth) acrylate, butanediol di (meth) acrylate esterified with (meth) acrylic acid; Bisphenol A, an alkylene oxide adduct of bisphenol A, or the hydroxyl groups at both ends of these halogen substituents esterified with (meth) acrylic acid; Polyhydric alcohols such as trimethylolpropane and pentaerythritol esterified with (meth) acrylic acid, and glycidyl (meth)
- the (meth) acrylic resin may be modified by the reaction between the functional groups of the copolymer.
- the reaction include a demethanol condensation reaction in a polymer chain of a methyl ester group of methyl (meth) acrylate and a hydroxyl group of methyl 2- (hydroxymethyl) acrylate, and a carboxyl group of (meth) acrylate.
- Examples thereof include a dehydration condensation reaction in a polymer chain with a hydroxyl group of methyl 2- (hydroxymethyl) acrylate.
- the glass transition temperature of the (meth) acrylic resin is preferably 80 ° C. or higher and 160 ° C. or lower.
- the glass transition temperature is the polymerization ratio of the methacrylic acid ester-based monomer and the acrylic acid ester-based monomer, the carbon chain length of each ester group, the types of functional groups having them, and the polyfunctional monomer for the entire monomer. It can be controlled by adjusting the polymerization ratio of the monomer.
- the ring structure is preferably a heterocyclic structure such as a cyclic acid anhydride structure, a cyclic imide structure and a lactone structure.
- glutaric anhydride structure Cyclic acid anhydride structure such as succinic anhydride structure
- cyclic imide structure such as glutarimide structure and succinicimide structure
- lactone ring structure such as butyrolactone and valerolactone.
- the cyclic acid anhydride structure and the cyclic imide structure are introduced by copolymerizing a monomer having a cyclic structure such as maleic anhydride and maleimide; a cyclic acid anhydride structure is obtained by a dehydration / demethanol condensation reaction after polymerization.
- Method of introduction It can be introduced by a method of reacting an amino compound to introduce a cyclic imide structure or the like.
- a resin (polymer) having a lactone ring structure after preparing a polymer having a hydroxyl group and an ester group in a polymer chain, the hydroxyl group and the ester group in the obtained polymer are required by heating. Therefore, it can be obtained by a method of forming a lactone ring structure by cyclization condensation in the presence of a catalyst such as an organic phosphorus compound.
- the first thermoplastic resin film 10 and the second thermoplastic resin film 20 may contain additives, if necessary.
- the additive include a lubricant, an antiblocking agent, a heat stabilizer, an antioxidant, an ultraviolet absorber, an antistatic agent, an impact resistance improving agent, a surfactant and the like.
- the alkyl acrylate which is the main component of the elastic polymer includes, for example, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethyl hexyl acrylate, etc., which have an alkyl group having 1 or more and 8 or less carbon atoms.
- alkyl acrylate having an alkyl group having 4 or more carbon atoms is preferably used.
- the other vinyl-based monomer copolymerizable with the alkyl acrylate include a compound having one polymerizable carbon-carbon double bond in the molecule, and more specifically, methyl methacrylate.
- the first thermoplastic resin film 10 and the second thermoplastic resin film 20 may be films made of the same thermoplastic resin, or may be films made of different thermoplastic resins.
- the first thermoplastic resin film 10 and the second thermoplastic resin film 20 may be the same or different in terms of thickness, presence / absence of additives, their types, retardation characteristics, and the like.
- the first thermoplastic resin film 10 is a (meth) acrylic resin film
- the second thermoplastic resin film 20 is a polyolefin resin film (preferably a cyclic polyolefin resin film) or a cellulose ester film. It is a resin or a polyester resin film.
- the first thermoplastic resin film 10 and the second thermoplastic resin film 20 are (meth) acrylic resin films.
- the first thermoplastic resin film 10 and / or the second thermoplastic resin film 20 has a hard coat layer, an antiglare layer, an antireflection layer, a light diffusion layer, and a charge on the outer surface thereof (the surface opposite to the polarizing element 30).
- a surface treatment layer (coating layer) such as an antifouling layer, an antifouling layer, and a conductive layer may be provided.
- the thicknesses of the first thermoplastic resin film 10 and the second thermoplastic resin film 20 are usually 5 ⁇ m or more and 200 ⁇ m or less, preferably 10 ⁇ m or more and 120 ⁇ m or less, more preferably 10 ⁇ m or more and 85 ⁇ m or less, and further preferably 15 ⁇ m or more and 65 ⁇ m or less. Is.
- the thickness of the first thermoplastic resin film 10 and the second thermoplastic resin film 20 may be 50 ⁇ m or less, or 40 ⁇ m or less, respectively. Reducing the thickness of the first thermoplastic resin film 10 and the second thermoplastic resin film 20 is advantageous for reducing the thickness of the polarizing plate and the image display device to which the polarizing plate is applied.
- surface modification such as saponification treatment, plasma treatment, corona treatment, primer treatment, etc. is performed on the surface to which the adhesive composition of the first thermoplastic resin film 10 and the second thermoplastic resin film 20 is applied. Quality treatment may be performed.
- thermoplastic resin film By laminating and adhering a first thermoplastic resin film 10 to one surface of a polarizing element 30 via a first adhesive layer 15, the configuration shown in FIG. 1 is configured. A polarizing plate can be obtained, and the second thermoplastic resin film 20 is further laminated and adhered to the other surface of the polarizing element 30 via the second adhesive layer 25 to obtain a polarizing plate having the configuration shown in FIG. Obtainable.
- thermoplastic resin film When producing a polarizing plate having both a first thermoplastic resin film 10 and a second thermoplastic resin film 20 (hereinafter, these are collectively simply referred to as “thermoplastic resin film”), these thermoplastic resins are used. The film may be laminated and bonded one side at a time step by step, or the thermoplastic resin films on both sides may be laminated and bonded at the same time.
- the first adhesive layer 15 is formed from the adhesive composition according to the present invention.
- the first adhesive layer 15 is a cured product layer of the adhesive composition according to the present invention.
- at least one of the first adhesive layer 15 and the second adhesive layer 25 is formed from the adhesive composition according to the present invention.
- the first adhesive layer 15 and / or the second adhesive layer 25 is a cured product layer of the adhesive composition according to the present invention.
- one of the first adhesive layer 15 and the second adhesive layer 25 is formed from the adhesive composition according to the present invention, and the other is the adhesive composition according to the present invention. It may be formed from another adhesive composition different from the one. Examples of other adhesive compositions include conventionally known water-based adhesives and active energy ray-curable adhesives.
- water-based adhesive examples include a conventionally known adhesive composition using a polyvinyl alcohol-based resin or a urethane resin as a main component.
- the active energy ray-curable adhesive is an adhesive that cures by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays.
- active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays.
- the adhesive layer of the polarizing plate is a cured product layer of the adhesive.
- the active energy ray-curable adhesive can be an adhesive containing an epoxy-based compound that is cured by cationic polymerization as a curable component, and preferably an ultraviolet curable adhesive containing such an epoxy-based compound as a curable component. It is an agent.
- the epoxy-based compound means a compound having an average of one or more, preferably two or more epoxy groups in the molecule. Only one kind of epoxy compound may be used, or two or more kinds may be used in combination.
- a hydrogenated epoxy compound (having an alicyclic ring) obtained by reacting epichlorohydrin with an alicyclic polyol obtained by hydrogenating the aromatic ring of an aromatic polyol has an alicyclic ring.
- Polyglycidyl ether of polyol Aromatic epoxy compounds such as aliphatic polyhydric alcohols or polyglycidyl ethers of alkylene oxide adducts thereof; Epoxide compounds having one or more epoxy groups bonded to an alicyclic ring in the molecule. Examples thereof include certain alicyclic epoxy compounds.
- the active energy ray-curable adhesive can contain, as a curable component, a (meth) acrylic compound which is radically polymerizable in place of or together with the epoxy-based compound.
- the (meth) acrylic compound is a (meth) acrylate monomer having one or more (meth) acryloyloxy groups in the molecule; obtained by reacting two or more kinds of functional group-containing compounds, and at least two in the molecule. Examples thereof include (meth) acryloyloxy group-containing compounds such as (meth) acrylate oligomers having a (meth) acryloyloxy group.
- the active energy ray-curable adhesive contains an epoxy-based compound that is cured by cationic polymerization as a curable component, it preferably contains a photocationic polymerization initiator.
- the photocationic polymerization initiator include aromatic diazonium salts; onium salts such as aromatic iodonium salts and aromatic sulfonium salts; iron-allene complexes and the like.
- the active energy ray-curable adhesive contains a radically polymerizable component such as a (meth) acrylic compound, it preferably contains a photoradical polymerization initiator.
- photoradical polymerization initiator examples include an acetophenone-based initiator, a benzophenone-based initiator, a benzoin ether-based initiator, a thioxanthone-based initiator, xanthone, fluorenone, camphorquinone, benzaldehyde, anthraquinone and the like.
- the adhesive composition is applied to the bonding surface of the polarizing element 30 and / or the bonding surface of the thermoplastic resin film, or the polarizing element 30 and the thermoplastic resin are bonded to each other. It is possible to include a step of injecting an adhesive composition between the film and the film, laminating both films via a layer of the adhesive composition, and pressing the films from above and below using, for example, a bonding roll or the like to bond the films. ..
- one or both of the bonded surfaces of the polarizing element 30 and the thermoplastic resin film are subjected to saponification treatment, corona discharge treatment, plasma treatment, flame treatment, primer treatment, and anchor coating treatment. You may perform easy-adhesion treatment (surface activation treatment) such as.
- the thickness of the adhesive layer formed from the adhesive composition according to the present invention is, for example, 0.1 ⁇ m or more and 100 ⁇ m or less, preferably 0.5 ⁇ m or more and 80 ⁇ m or less, and more preferably 1 ⁇ m or more and 60 ⁇ m in the polarizing plate. It is less than or equal to, and more preferably 2 ⁇ m or more and 50 ⁇ m or less. From the viewpoint of reducing the thickness of the polarizing plate, it is also preferable that the thickness of the adhesive layer is 30 ⁇ m or less, more preferably 20 ⁇ m or less.
- the first adhesive layer 15 and the second adhesive layer 25 may have the same thickness or may be different in thickness.
- the polarizing plate can be provided with an optical functional film other than the polarizing element 30 for imparting a desired optical function.
- a suitable example thereof is a retardation film.
- the first thermoplastic resin film 10 and / or the second thermoplastic resin film 20 can also serve as the retardation film, but the retardation film can also be laminated separately from the thermoplastic resin film. .. In the latter case, the retardation film can be laminated on the outer surface of the first thermoplastic resin film 10 and / or the second thermoplastic resin film 20 via the pressure-sensitive adhesive layer and the adhesive layer.
- optically functional films examples include a condenser plate, a brightness improving film, a reflective layer (reflective film), a semi-transmissive reflective layer (semi-transmissive reflective film), and a light diffusing layer (light). Diffusing film) etc. These are generally provided when the polarizing plate is a polarizing plate arranged on the back surface side (backlight side) of the liquid crystal cell.
- the polarizing plate according to the present invention may include an adhesive layer for attaching the polarizing plate to an image display element such as a liquid crystal cell or an organic EL element, or another optical member.
- the pressure-sensitive adhesive layer is the outer surface of the polarizing element 30 in the polarizing plate having the structure shown in FIG. 1, and the outer surface of the first thermoplastic resin film 10 or the second thermoplastic resin film 20 in the polarizing plate having the structure shown in FIG. Can be laminated to.
- a (meth) acrylic resin, a silicone-based resin, a polyester-based resin, a polyurethane-based resin, a polyether-based resin, or the like as a base polymer can be used.
- a (meth) acrylic pressure-sensitive adhesive is preferable from the viewpoints of transparency, adhesive strength, reliability, weather resistance, heat resistance, reworkability and the like.
- the thickness of the pressure-sensitive adhesive layer is determined according to the adhesive strength and the like, but a range of 1 ⁇ m or more and 50 ⁇ m or less is appropriate, and preferably 2 ⁇ m or more and 40 ⁇ m or less.
- the pressure-sensitive adhesive layer contains, if necessary, a filler made of glass fiber, glass beads, resin beads, metal powder or other inorganic powder, a pigment, a colorant, an antioxidant, an ultraviolet absorber, an antioxidant and the like. be able to.
- the polarizing plate according to the present invention may include a protective film for protecting the surface thereof (thermoplastic resin film surface, polarizing element surface, etc.). After the polarizing plate is attached to, for example, an image display element or another optical member, the protective film is peeled off and removed together with the pressure-sensitive adhesive layer contained therein.
- the protective film is composed of, for example, a base film and an adhesive layer laminated on the base film.
- the above description is cited for the pressure-sensitive adhesive layer.
- the resin constituting the base film is, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, or a thermoplastic resin such as a polycarbonate resin. be able to.
- a polyester resin such as polyethylene terephthalate is preferable.
- the curable adhesive composition B is 1,4- to 100 parts by mass of 3', 4'-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (trade name "Ceroxide 2021P” manufactured by Daicel Co., Ltd.). 25 parts by mass of butanediol diglycidyl ether (trade name "EX-214L” manufactured by Nagase ChemteX Corporation) and 5.6 parts by mass of photopolymerization initiator (trade name "CPI-100P” manufactured by Sun Appro Co., Ltd.) was added and prepared by mixing.
- Example 1 A curable adhesive composition A was prepared in the same manner as in Example 1 except that the blending amount of the blended components was changed as shown in Table 1. Further, a polarizing plate was produced in the same manner as in Example 1 except that the curable adhesive composition A was used.
- the obtained laminate (sample for measuring moisture permeability) was measured for moisture permeability [g / ( m 2.24 hr)] at a temperature of 40 ° C. and a relative humidity of 90% by the cup method specified in JIS Z 0208. ..
- the cured adhesive layer (cured film) of the above laminated body was set to be in an environment of a temperature of 40 ° C. and a relative humidity of 90%.
- the laminate was attached to the cup with the cured film facing outward.
- the results are shown in the column of "Humidity permeability of laminated body" in Table 1.
- the numerical values in parentheses indicate the thickness (unit: ⁇ m) of the cured film of the laminated body.
- the PMMA film having a thickness of 60 ⁇ m, which is a base film has a moisture permeability (Jsub) of 70 g / (m 2 ⁇ ) measured under the conditions of a temperature of 40 ° C. and a relative humidity of 90% by the cup method specified in JIS Z 0208. It was 24hr).
- the results are shown in the column of "Humidity permeability of cured film" in Table 1.
- the numerical values in parentheses indicate the thickness (unit: ⁇ m) of the cured film.
- a cutter blade was inserted between the polarizing element of the test piece and the PMMA film, and the peeled portion was peeled off by 30 mm from the end in the length direction.
- the test piece in this state in an atmosphere with a temperature of 23 ° C. and a relative humidity of 55%, according to JIS K 6854-2: 1999 "Adhesive-Peeling Adhesive Strength Test Method-Part 2: 180 Degree Peeling".
- a peeling test was performed at a gripping movement speed of 300 mm / min, and an average peeling force over a length of 170 mm excluding 30 mm of the gripped portion was obtained, which was used as the peeling strength between the polarizing element and the PMMA film.
- the results are shown in Table 1. The peel strength was measured after the polarizing plate was prepared and then placed in an environment of a temperature of 23 ° C. and a relative humidity of 50% RH for 24 hours.
- Example 4 (1) Preparation of Curable Adhesive Composition The components shown in Table 2 were mixed in the blending amounts shown in Table 2 to prepare a curable adhesive composition C. The unit of the blending amount of each component shown in Table 2 is a mass part.
- the total integrated light amount (integrated amount of light irradiation intensity in the wavelength region of 320 to 400 nm) is about 200 mJ / cm 2 (measuring instrument: measured value by UV Power Pack II manufactured by Fusion UV).
- the layer of the curable adhesive composition B and the layer of the curable adhesive composition C were cured by irradiating with ultraviolet rays (UVB) to prepare a polarizing plate.
- the thickness of the cured layer of the curable adhesive composition C was about 10 ⁇ m, and the thickness of the cured layer of the curable adhesive composition B was 2.5 ⁇ m.
- the curable adhesive composition B is 1,4- to 100 parts by mass of 3', 4'-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (trade name "Ceroxide 2021P” manufactured by Daicel Co., Ltd.). 25 parts by mass of butanediol diglycidyl ether (trade name "EX-214L” manufactured by Nagase ChemteX Corporation) and 5.6 parts by mass of photopolymerization initiator (trade name "CPI-100P” manufactured by Sun Appro Co., Ltd.) was added and prepared by mixing.
- Examples 5 to 8> A curable adhesive composition C was prepared in the same manner as in Example 4 except that the blending amount of the blended components was changed as shown in Table 2. Further, a polarizing plate was produced in the same manner as in Example 4 except that the curable adhesive composition C was used.
- UVB ultraviolet rays
- the adhesive layer was cured by the above method to obtain a laminate having a layer structure of PMMA film / cured adhesive layer / PET film.
- the PET film was peeled off to obtain a laminate (sample for measuring moisture permeability) having a layer structure of PMMA film / cured adhesive layer (cured film).
- the obtained laminate (sample for measuring moisture permeability) was measured for moisture permeability [g / ( m 2.24 hr)] at a temperature of 40 ° C. and a relative humidity of 90% by the cup method specified in JIS Z 0208. ..
- the cured adhesive layer (cured film) of the above laminated body was set to be in an environment of a temperature of 40 ° C. and a relative humidity of 90%.
- the laminate was attached to the cup with the cured film facing outward.
- the results are shown in the column of "Humidity permeability of laminated body" in Table 2.
- the numerical values in parentheses indicate the thickness (unit: ⁇ m) of the cured film of the laminated body.
- the PMMA film having a thickness of 60 ⁇ m, which is a base film has a moisture permeability (Jsub) of 70 g / (m 2 ⁇ ) measured under the conditions of a temperature of 40 ° C. and a relative humidity of 90% by the cup method specified in JIS Z 0208. It was 24hr).
- the results are shown in the column of "Humidity permeability of cured film" in Table 2. The numerical values in parentheses indicate the thickness (unit: ⁇ m) of the cured film.
- a cutter blade was inserted between the polarizing element of the test piece and the PMMA film, and the peeled portion was peeled off by 30 mm from the end in the length direction.
- the test piece in this state in an atmosphere with a temperature of 23 ° C. and a relative humidity of 55%, according to JIS K 6854-2: 1999 "Adhesive-Peeling Adhesive Strength Test Method-Part 2: 180 Degree Peeling".
- a peeling test was performed at a gripping movement speed of 300 mm / min, and an average peeling force over a length of 170 mm excluding 30 mm of the gripped portion was obtained, which was used as the peeling strength between the polarizing element and the PMMA film.
- the results are shown in Table 2. The peel strength was measured after the polarizing plate was prepared and then placed in an environment of a temperature of 23 ° C. and a relative humidity of 50% RH for 24 hours.
- breaking means that the peeling strength is very high and the PMMA film or the polarizing element is broken before the film is peeled off.
- thermoplastic resin film 10 1st thermoplastic resin film, 15 1st adhesive layer, 20 2nd thermoplastic resin film, 25 2nd adhesive layer, 30 polarizing elements.
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Abstract
Description
[1] 無水マレイン酸変性化合物(A)、(メタ)アクリレート化合物(B)及び光重合開始剤(C)を含み、
前記(メタ)アクリレート化合物(B)は、単官能(メタ)アクリレート化合物(B-1)を含み、
前記単官能(メタ)アクリレート化合物(B-1)は、脂環式アルキル(メタ)アクリレート化合物及び直鎖又は分岐鎖のC4-C36アルキル(メタ)アクリレート化合物を含む硬化性接着剤組成物。
[2] 前記単官能(メタ)アクリレート化合物(B-1)の含有量が、前記(メタ)アクリレート化合物(B)100質量%中、60質量%以上99質量%以下である[1]に記載の硬化性接着剤組成物。
[3] 前記脂環式アルキル(メタ)アクリレート化合物の含有量が、前記脂環式アルキル(メタ)アクリレート化合物及び前記直鎖又は分岐鎖のC4-C36アルキル(メタ)アクリレート化合物の合計量100質量%中、5質量%以上80質量%以下である[1]又は[2]に記載の硬化性接着剤組成物。
[4] 未変性ポリブタジエン(D)をさらに含む[1]~[3]のいずれかに記載の硬化性接着剤組成物。
[5] 前記無水マレイン酸変性化合物(A)の含有量が、前記無水マレイン酸変性化合物(A)及び未変性ポリブタジエン(B)の合計量100質量%中、40質量%以上90質量%以下である[4]に記載の硬化性接着剤組成物。
[6] 石油樹脂(E)をさらに含む[1]~[5]のいずれかに記載の硬化性接着剤組成物。
[7] 前記無水マレイン酸変性化合物(A)は、無水マレイン酸変性重合体(A-1)を含む[1]~[6]のいずれかに記載の硬化性接着剤組成物。
[8] 前記硬化性接着剤組成物からなる厚み10μmの硬化膜は、温度40℃、相対湿度90%において400g/(m2・24hr)以下の透湿度を有する[1]~[7]のいずれかに記載の硬化性接着剤組成物。
[9] 偏光子、接着剤層及び熱可塑性樹脂フィルムをこの順に含む偏光板であって、
前記接着剤層は、[1]~[8]のいずれかに記載の硬化性接着剤組成物の硬化物層である偏光板。
[10] 前記熱可塑性樹脂フィルムは、(メタ)アクリル系樹脂フィルムである[9]に記載の偏光板。
本発明に係る硬化性接着剤組成物(以下、「接着剤組成物」ともいう。)は、熱可塑性樹脂フィルムの接着に好適であり、例えば、熱可塑性樹脂フィルムと他の熱可塑性樹脂フィルム(又は層)との貼合に用いることができる。本発明に係る接着剤組成物の適用の一例は偏光板用であり、すなわち、偏光板を作製するために用いることができる。より具体的には、本発明に係る接着剤組成物は、偏光子と熱可塑性樹脂フィルムとの貼合に用いられる接着剤組成物として有用である。
偏光板は、偏光子及び上記熱可塑性樹脂フィルム以外のフィルム又は層を含んでいてもよい。
なお、本明細書において接着剤組成物に含まれる又は含まれ得る各成分として例示する化合物は、特に断りのない限り、単独で、又は、複数種を組み合わせて使用することができる。
無水マレイン酸変性化合物(A)は、無水マレイン酸構造を分子内に含む化合物である。接着剤組成物は、1種の無水マレイン酸変性化合物(A)を含んでいてもよいし、2種以上の無水マレイン酸変性化合物(A)を含んでいてもよい。
無水マレイン酸変性化合物(A)としては、無水マレイン酸変性重合体(A-1)が挙げられる。
-1)を含んでいてもよい。
液状の無水マレイン酸変性重合体(A-1)の25℃における粘度は、塗工性が良好な接着剤組成物を得る観点から、通常1Pa・sec以上1300Pa・sec以下であり、好ましくは10Pa・sec以上1000Pa・sec以下であり、より好ましくは15Pa・sec以上700Pa・sec以下であり、さらに好ましくは15Pa・sec以上150Pa・sec以下である。
無水マレイン酸変性重合体(A-1)の数平均分子量は、ゲルパーミエーションクロマトグラフィ(GPC)による標準ポリスチレン換算値として測定することができる。
無水マレイン酸変性重合体(A-1)の酸価は、JIS K 0070:1992に従う、フェノールフタレインを指示薬とする中和滴定法によって測定される。
(メタ)アクリレート化合物(B)は、分子内に1個以上の(メタ)アクリロイルオキシ基を有するラジカル重合性化合物である。
接着剤組成物は、(メタ)アクリレート化合物(B)を1種又は2種以上含有することができる。
(メタ)アクリレート化合物(B)は、単官能(メタ)アクリレート化合物(B-1)、2官能(メタ)アクリレート化合物(B-2)及び多官能(メタ)アクリレート化合物(B-3)を、それぞれ、1種又は2種以上含有することができる。
ベンジル(メタ)アクリレート等のアラルキル(メタ)アクリレート、並びに、2-フェノキシエチル(メタ)アクリレート、フェノキシエチレングリコール(メタ)アクリレート、2-ヒドロキシ-3-フェノキシプロピル(メタ)アクリレート、エトキシ化-o-フェニルフェノール(メタ)アクリレート等のフェノキシ(メタ)アクリレート等の、エステル結合(-C(=O)-O-)の-O-に結合する基が芳香環を含む芳香族(メタ
)アクリレート化合物;
シクロヘキシル(メタ)アクリレート、シクロヘキシルメチル(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、1,4-シクロヘキサンジメタノールモノ(メタ)アクリレート、イソボルニル(メタ)アクリレート等の、エステル結合(-C(=O)-O-)の-O-に結合する基が脂環式環を含む脂環式アルキル(メタ)アクリレート化合物;
N,N-ジメチルアミノエチル(メタ)アクリレート等のアミノアルキル(メタ)アクリレート化合物;
ジシクロペンテニルオキシエチル(メタ)アクリレート、エチルカルビトール(メタ)アクリレート、テトラヒドロフルフリル(メタ)アクリレート等の、エステル結合(-C(=O)-O-)の-O-に結合する基がエーテル結合を含む(メタ)アクリレート化合物であって、上記以外のもの
等が挙げられる。
2-ヒドロキシエチル(メタ)アクリレート、2-又は3-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、2-ヒドロキシ-3-フェノキシプロピル(メタ)アクリレート、トリメチロールプロパンモノ(メタ)アクリレート、ペンタエリスリトールモノ(メタ)アクリレート等の、エステル結合(-C(=O)-O-)の-O-に結合する基が水酸基を含む(メタ)アクリレート化合物;
2-カルボキシエチル(メタ)アクリレート、ω-カルボキシ-ポリカプロラクトン(n≒2)モノ(メタ)アクリレート、1-[2-(メタ)アクリロイルオキシエチル]フタル酸、1-[2-(メタ)アクリロイルオキシエチル]ヘキサヒドロフタル酸、1-[2-(メタ)アクリロイルオキシエチル]コハク酸、4-[2-(メタ)アクリロイルオキシエチル]トリメリット酸、N-(メタ)アクリロイルオキシ-N’,N’-ジカルボキシメチル-p-フェニレンジアミン等の、エステル結合(-C(=O)-O-)の-O-に結合する基がカルボキシル基を含む(メタ)アクリレート化合物
等が挙げられる。
Xは、エチレンオキサイドであることが好ましく、また、mとnとの合計の平均が2~20であることが好ましく、3~15であることがより好ましく、4~13であることがさらに好ましい。
3官能以上のハロゲン置換ポリオールのポリ(メタ)アクリレート;
グリセリンのアルキレンオキシド付加物のトリ(メタ)アクリレート;
トリメチロールプロパンのアルキレンオキシド付加物のトリ(メタ)アクリレート;
1,1,1-トリス[(メタ)アクリロイルオキシエトキシエトキシ]プロパン;
トリス(ヒドロキシエチル)イソシアヌレートトリ(メタ)アクリレート
等が挙げられる。
%以上60質量%以下であり、なおさらに好ましくは20質量%以上50質量%以下である。
光重合開始剤(C)は、光の作用により活性ラジカル、酸等を発生し、(メタ)アクリレート化合物(B)の重合を開始させ得る化合物であれば特に限定されない。
接着剤組成物は、光重合開始剤(C)を1種のみ含んでいてもよいし、2種以上含んでいてもよい。
イルガキュア(商品名)OXE01、同OXE02、同OXE03(以上、BASF社製)、N-1919、NCI-930、NCI-831(以上、ADEKA社製)等の市販品を用いてもよい。
Omnirad(商品名)369、同907、同379(以上、IGM Resins
B.V.社製)等の市販品を用いてもよい。
Omnirad(商品名)184(IGM Resins B.V.社製)等の市販品を用いてもよい。
ベンゾイン、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインイソプロピルエーテル、ベンゾインイソブチルエーテル等のベンゾイン化合物;
ベンゾフェノン、o-ベンゾイル安息香酸メチル、4-フェニルベンゾフェノン、4-ベンゾイル-4’-メチルジフェニルサルファイド、3,3’,4,4’-テトラ(tert-ブチルパーオキシカルボニル)ベンゾフェノン、2,4,6-トリメチルベンゾフェノン、4,4’-ジ(N,N’-ジメチルアミノ)-ベンゾフェノン等のベンゾフェノン化合物;
2-イソプロピルチオキサントン、2,4-ジエチルチオキサントン等のキサントン化合物;
9,10-ジメトキシアントラセン、2-エチル-9,10-ジメトキシアントラセン、9,10-ジエトキシアントラセン、2-エチル-9,10-ジエトキシアントラセン等のアントラセン化合物;
9,10-フェナンスレンキノン、2-エチルアントラキノン、カンファーキノン等のキノン化合物;
ベンジル、フェニルグリオキシル酸メチル、チタノセン化合物
等が挙げられる。
0.1質量%以上20質量%以下であり、接着剤組成物の硬化性の観点及び熱可塑性樹脂フィルム(又は層)に対する接着剤組成物の接着能力の観点から、好ましくは0.5質量%以上15質量%以下であり、より好ましくは1質量%以上10質量%以下(例えば8質量%以下)である。
接着剤組成物は、未変性ポリブタジエン(D)をさらに含むことができる。接着剤組成物が未変性ポリブタジエン(D)をさらに含むことは、接着剤組成物の接着能力の観点及びポリビニルアルコール系偏光子を用いた偏光板の湿熱耐久性の観点から有利となり得る。
未変性ポリブタジエン(D)が1,4-付加単位及び1,2-付加単位の両方を含む場合、それらの含有量はモル比で、通常、1,4-付加単位/1,2-付加単位=50~95/50~5であり、好ましくは70~90/30~10であり、より好ましくは75~90/25~10である。
液状の未変性ポリブタジエン(D)の25℃における粘度は、塗工性が良好な接着剤組成物を得る観点から、好ましくは0.1Pa・sec以上100Pa・sec以下であり、より好ましくは0.2Pa・sec以上50Pa・sec以下であり、さらに好ましくは0.5Pa・sec以上10Pa・sec以下である。
未変性ポリブタジエン(D)の数平均分子量は、GPCによる標準ポリスチレン換算値として測定することができる。
接着剤組成物は、粘着付与剤をさらに含むことができる。粘着付与樹脂は、特に制限はなく、公知のものから適宜選択することができ、例えば、ロジン誘導体(例えば、ロジン、重合ロジン、水添ロジン)、テルペン系樹脂(例えば、テルペン樹脂、芳香族変性テルペン樹脂、テルペンフェノール樹脂、水素添加テルペン樹脂)、石油樹脂、フェノール系樹脂、キシレン系樹脂等が挙げられる。
低透湿性の硬化膜を形成することができる接着剤組成物は、該硬化膜を介した水分の出入りを抑制することが求められる用途に好適である。例えば、偏光子の少なくとも一方の面に接着剤層を介して熱可塑性樹脂フィルムが積層されている偏光板又はこれを含む画像表示パネルにおいて、該接着剤層が低透湿性であると、水分の出入りに起因する偏光板又は画像表示パネルのカール(反り)を抑制することが可能となる。
接着剤組成物が石油樹脂(E)をさらに含むことは、偏光子と熱可塑性樹脂フィルムとの密着性を向上させるうえでも有利となり得る。
芳香族系石油樹脂は、芳香族炭化水素に由来する構成単位を1種又は2種以上含む樹脂であり、該樹脂を水素添加したもの、又は、該樹脂を変性したものであってもよい。
C9系石油樹脂は、C9留分と他のモノマー成分とを共重合することにより得られる樹脂であってもよく、該樹脂を水素添加したもの、又は、該樹脂を変性したものであってもよい。他のモノマー成分としては、C5留分が挙げられる。
C5留分としては、例えば、シクロペンタジエン、ペンテン、ペンタジエン、イソプレン、ピペリレン等の炭素数4~5個程度の石油留分が挙げられる。
石油樹脂(E)の重量平均分子量は、GPCによる標準ポリスチレン換算値として測定することができる。
1/Jt=(1/J)+(1/Jsub)
上記式中、Jtは上記積層体の透湿度であり、Jsubは上記基材フィルムの透湿度である。基材フィルムとしては、後述する熱可塑性樹脂フィルムと同様のものを用いることができる。JIS Z 0208に従って積層体の透湿度を測定する際、積層体は、上記硬化膜を外側に向けてカップに取り付けられる。
接着剤組成物は、上記以外のその他の成分を含むことができる。
その他の成分としては、(メタ)アクリレート化合物(C)以外の硬化性成分、架橋剤;カップリング剤、酸化防止剤、紫外線吸収剤、熱安定剤等の添加剤が挙げられる。
接着剤組成物の25℃における粘度は、10000mPa・sec以下であることが好ましく、2mPa・sec以上7000mPa・sec以下であることがより好ましく、300mPa・sec以上5000mPa・sec以下であることがさらに好ましい。
接着剤組成物の25℃における粘度は、E型粘度計によって測定することができる。
上記本発明に係る接着剤組成物は、熱可塑性樹脂フィルムの接着に好適であり、例えば、熱可塑性樹脂フィルムと他の熱可塑性樹脂フィルム(又は層)との貼合に用いることができる。本発明に係る接着剤組成物の適用の一例は偏光板用であり、すなわち、偏光板を作製するために用いることができる。より具体的には、本発明に係る接着剤組成物は、偏光子とその上に積層される保護フィルムのような熱可塑性樹脂フィルムとの貼合に用いられる接着剤組成物として有用である。
本発明に係る偏光板の層構成の例を図1及び図2に示す。
図1に示されるように本発明に係る偏光板は、偏光子30、第1接着剤層15及び第1熱可塑性樹脂フィルム10をこの順に含むものであることができ、すなわち、偏光子30と、その一方の面に第1接着剤層15を介して積層貼合される第1熱可塑性樹脂フィルム10とを含むものであることができる。
第1接着剤層15と第1熱可塑性樹脂フィルム10とは直接接していることが好ましい。
偏光子30と第1接着剤層15とは直接接していることが好ましい。
第1接着剤層15と第1熱可塑性樹脂フィルム10とは直接接していることが好ましい。
偏光子30と第1接着剤層15とは直接接していることが好ましい。
第2接着剤層25と第2熱可塑性樹脂フィルム20とは直接接していることが好ましい。
偏光子30と第2接着剤層25とは直接接していることが好ましい。
両接着剤層が本発明に係る接着剤組成物から形成される場合において、これらの接着剤組成物は、同一の組成であってもよいし、異なる組成であってもよい。
偏光子30は、自然光からある一方向の直線偏光を選択的に透過する機能を有するフィルムである。偏光子30としては、例えば、ポリビニルアルコール系樹脂フィルムに二色性色素としてのヨウ素を吸着・配向させたヨウ素系偏光子、ポリビニルアルコール系樹脂フィルムに二色性色素としての二色性染料を吸着・配向させた染料系偏光子、及びリオトロビック液晶状態の二色性染料をコーティングし、配向・固定化した塗布型偏光子等が挙げられる。これらの偏光子は、自然光からある一方向の直線偏光を選択的に透過し、もう一方向の直線偏光を吸収するため吸収型偏光子と呼ばれている。
中でも、偏光子30は、ポリビニルアルコール系樹脂で構成されるポリビニルアルコール系偏光子であることがより好ましく、ポリビニルアルコール系樹脂フィルムにヨウ素や二色性染料等の二色性色素を吸着・配向させたポリビニルアルコール系偏光子であることがさらに好ましく、ポリビニルアルコール系樹脂フィルムにヨウ素を吸着・配向させたポリビニルアルコール系偏光子であることが特に好ましい。
ポリビニルアルコール系偏光子は、ポリビニルアルコール系樹脂フィルム(又は層)を用いて従来公知の方法によって製造することができる。
第1熱可塑性樹脂フィルム10及び第2熱可塑性樹脂フィルム20はそれぞれ、透光性を有する(好ましくは光学的に透明な)熱可塑性樹脂、例えば、鎖状ポリオレフィン系樹脂(ポリエチレン樹脂、ポリプロピレン系樹脂等)、環状ポリオレフィン系樹脂(ノルボルネン系樹脂等)等のポリオレフィン系樹脂;トリアセチルセルロース、ジアセチルセルロース等のセルロースエステル系樹脂;ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレート等のポリエステル系樹脂;ポリカーボネート系樹脂;(メタ)アクリル系樹脂;又はこれらの混合物、共重合物等からなるフィルムであることができる。
第1熱可塑性樹脂フィルム10及び/又は第2熱可塑性樹脂フィルム20は、偏光子30を保護する役割を担う保護フィルムであってもよいし、位相差フィルム等の光学機能を併せ持つ保護フィルムであることもできる。
例えば、上記熱可塑性樹脂からなるフィルムを延伸(一軸延伸又は二軸延伸等)したり、該熱可塑性樹脂フィルム上に液晶層等を形成したりすることにより、任意の位相差値が付与された位相差フィルムとすることができる。
1つの実施形態において(メタ)アクリル系樹脂は、共重合成分としてメタクリル酸メチルを含むか、又はメタクリル酸メチルとアクリル酸メチルとを含む。
アクリル酸エチル、アクリル酸n-、i-又はt-ブチル、アクリル酸シクロヘキシル、アクリル酸フェニル、アクリル酸ベンジル、アクリル酸2-エチルヘキシル、アクリル酸2-ヒドロキシエチル等のアクリル酸エステル類;
2-(ヒドロキシメチル)アクリル酸メチル、2-(1-ヒドロキシエチル)アクリル酸メチル、2-(ヒドロキシメチル)アクリル酸エチル、2-(ヒドロキシメチル)アクリル酸n-、i-又はt-ブチル等のヒドロキシアルキルアクリル酸エステル類;
メタクリル酸、アクリル酸等の不飽和酸類;
クロロスチレン、ブロモスチレン等のハロゲン化スチレン類;
ビニルトルエン、α-メチルスチレン等の置換スチレン類;
アクリロニトリル、メタクリロニトリル等の不飽和ニトリル類;
無水マレイン酸、無水シトラコン酸等の不飽和酸無水物類;
フェニルマレイミド、シクロヘキシルマレイミド等の不飽和イミド類;
等の単官能単量体が挙げられる。
上記他の単官能単量体は、1種のみを単独で用いてもよいし、2種以上を併用してもよい。
多官能単量体としては、例えば、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、トリ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、ノナエチレングリコールジ(メタ)アクリレート、テトラデカエチレングリコールジ(メタ)アクリレート等のエチレングリコール又はそのオリゴマーの両末端ヒドロキシル基を(メタ)アクリル酸でエステル化したもの;
プロピレングリコール又はそのオリゴマーの両末端ヒドロキシル基を(メタ)アクリル酸でエステル化したもの;
ネオペンチルグリコールジ(メタ)アクリレート、ヘキサンジオールジ(メタ)アクリレート、ブタンジオールジ(メタ)アクリレート等の2価アルコールのヒドロキシル基を(メタ)アクリル酸でエステル化したもの;
ビスフェノールA、ビスフェノールAのアルキレンオキサイド付加物、又はこれらのハロゲン置換体の両末端ヒドロキシル基を(メタ)アクリル酸でエステル化したもの;
トリメチロールプロパン、ペンタエリスリトール等の多価アルコールを(メタ)アクリル酸でエステル化したもの、並びにこれら末端ヒドロキシル基にグリシジル(メタ)アクリレートのエポキシ基を開環付加させたもの;
コハク酸、アジピン酸、テレフタル酸、フタル酸、これらのハロゲン置換体等の二塩基酸、又はこれらのアルキレンオキサイド付加物等にグリシジル(メタ)アクリレートのエポキシ基を開環付加させたもの;
アリール(メタ)アクリレート;ジビニルベンゼン等の芳香族ジビニル化合物;
等が挙げられる。
中でも、エチレングリコールジメタクリレート、テトラエチレングリコールジメタクリレート、ネオペンチルグリコールジメタクリレートが好ましく用いられる。
無水コハク酸構造等の環状酸無水物構造;グルタルイミド構造、コハクイミド構造等の環状イミド構造;ブチロラクトン、バレロラクトン等のラクトン環構造が挙げられる。
主鎖中の環構造の含有量を大きくするほど(メタ)アクリル系樹脂のガラス転移温度を高くすることができる傾向にある。
環状酸無水物構造、環状イミド構造は、無水マレイン酸、マレイミド等の環状構造を有する単量体を共重合させることによって導入する方法;重合後脱水・脱メタノール縮合反応により環状酸無水物構造を導入する方法;アミノ化合物を反応させて環状イミド構造を導入する方法等によって導入することができる。
ラクトン環構造を有する樹脂(重合体)は、高分子鎖にヒドロキシル基とエステル基とを有する重合体を調製した後、得られた重合体におけるヒドロキシル基とエステル基とを、加熱により、必要に応じて有機リン化合物等の触媒の存在下に環化縮合させてラクトン環構造を形成する方法によって得ることができる。
上記弾性重合体の例として、アクリル酸アルキルを主成分とし、これに共重合可能な他のビニル系単量体及び架橋性単量体を共重合させた架橋弾性共重合体が挙げられる。
弾性重合体の主成分となるアクリル酸アルキルとしては、例えば、アクリル酸メチル、アクリル酸エチル、アクリル酸ブチル、アクリル酸2-エチルへキシル等、アルキル基の炭素数が1以上8以下程度のものが挙げられ、炭素数4以上のアルキル基を有するアクリル酸アルキルが好ましく用いられる。
上記アクリル酸アルキルに共重合可能な他のビニル系単量体としては、分子内に重合性炭素-炭素二重結合を1個有する化合物を挙げることができ、より具体的には、メタクリル酸メチル等のメタクリル酸エステル;スチレン等の芳香族ビニル化合物;アクリロニトリル等のビニルシアン化合物等が挙げられる。
上記架橋性単量体としては、分子内に重合性炭素-炭素二重結合を少なくとも2個有する架橋性の化合物を挙げることができ、より具体的には、エチレングリコールジ(メタ)アクリレート、ブタンジオールジ(メタ)アクリレート等の多価アルコールの(メタ)アクリレート類;アリル(メタ)アクリレート等の(メタ)アクリル酸のアルケニルエステル;ジビニルベンゼン等が挙げられる。
本発明に係る接着剤組成物は、熱可塑性樹脂フィルムが(メタ)アクリル系樹脂フィルムである場合においてとりわけ、良好な密着性を示すことができる。したがって、本発明に係る接着剤組成物は、偏光子と(メタ)アクリル系樹脂フィルムとの貼合に好適に用いることができる。
(メタ)アクリル系樹脂フィルムは、好ましくはその樹脂成分が(メタ)アクリル系樹脂からなる。
1つの実施形態において、第1熱可塑性樹脂フィルム10は(メタ)アクリル系樹脂フィルムであり、第2熱可塑性樹脂フィルム20はポリオレフィン系樹脂フィルム(好ましくは、環状ポリオレフィン系樹脂フィルム)、セルロースエステル系樹脂又はポリエステル系樹脂フィルムである。
他の実施形態において、第1熱可塑性樹脂フィルム10及び第2熱可塑性樹脂フィルム20は、(メタ)アクリル系樹脂フィルムである。
偏光子30の一方の面に第1接着剤層15を介して第1熱可塑性樹脂フィルム10を積層接着することにより、図1に示される構成の偏光板を得ることができ、偏光子30の他方の面に第2接着剤層25を介して第2熱可塑性樹脂フィルム20をさらに積層接着することにより、図2に示される構成の偏光板を得ることができる。
第1熱可塑性樹脂フィルム10及び第2熱可塑性樹脂フィルム20(以下、これらを総称して単に「熱可塑性樹脂フィルム」ともいう。)の双方を有する偏光板を製造する場合、これらの熱可塑性樹脂フィルムは、段階的に片面ずつ積層接着してもよいし、両面の熱可塑性樹脂フィルムを同時に積層接着してもよい。
図2に示される構成の偏光板において第1接着剤層15及び第2接着剤層25は、それらの少なくともいずれか一方が本発明に係る接着剤組成物から形成される。第1接着剤層15及び/又は第2接着剤層25は、本発明に係る接着剤組成物の硬化物層である。
他の接着剤組成物としては、従来公知の水系接着剤又は活性エネルギー線硬化性接着剤が挙げられる。
活性エネルギー線硬化性接着剤は、(メタ)アクリル系化合物等のラジカル重合性成分を含む場合、光ラジカル重合開始剤を含有することが好ましい。光ラジカル重合開始剤としては、例えば、アセトフェノン系開始剤、ベンゾフェノン系開始剤、ベンゾインエーテル系開始剤、チオキサントン系開始剤、キサントン、フルオレノン、カンファーキノン、ベンズアルデヒド、アントラキノン等を挙げることができる。
活性エネルギー線を照射するために用いる光源は、紫外線、電子線、X線等を発生できるものであればよい。特に波長400nm以下に発光分布を有する、例えば、低圧水銀灯、中圧水銀灯、高圧水銀灯、超高圧水銀灯、ケミカルランプ、ブラックライトランプ、マイクロウェーブ励起水銀灯、メタルハライドランプ等が好適に用いられる。
第1接着剤層15と第2接着剤層25とは、厚みが同じであってもよいし、異なっていてもよい。
〔5-1〕光学機能性フィルム
偏光板は、所望の光学機能を付与するための、偏光子30以外の他の光学機能性フィルムを備えることができ、その好適な一例は位相差フィルムである。
上述のように、第1熱可塑性樹脂フィルム10及び/又は第2熱可塑性樹脂フィルム20が位相差フィルムを兼ねることもできるが、熱可塑性樹脂フィルムとは別途に位相差フィルムを積層することもできる。後者の場合、位相差フィルムは、粘着剤層や接着剤層を介して第1熱可塑性樹脂フィルム10及び/又は第2熱可塑性樹脂フィルム20の外面に積層することができる。
基材フィルムは通常、熱可塑性樹脂からなるフィルムであり、熱可塑性樹脂の一例は、トリアセチルセルロース等のセルロースエステル系樹脂である。
複屈折性フィルムを形成する熱可塑性樹脂としては、第1及び第2熱可塑性樹脂フィルム10,20について記述したものを使用することができる。
本発明に係る偏光板は、これを液晶セル、有機EL素子等の画像表示素子、又は他の光学部材に貼合するための粘着剤層を含むことができる。粘着剤層は、図1に示される構成の偏光板においては偏光子30の外面、図2に示される構成の偏光板においては第1熱可塑性樹脂フィルム10又は第2熱可塑性樹脂フィルム20の外面に積層することができる。
本発明に係る偏光板は、その表面(熱可塑性樹脂フィルム表面や偏光子表面等)を保護するためのプロテクトフィルムを含むことができる。プロテクトフィルムは、例えば画像表示素子や他の光学部材に偏光板が貼合された後、それが有する粘着剤層ごと剥離除去される。
基材フィルムを構成する樹脂は、例えば、ポリエチレンのようなポリエチレン系樹脂、ポリプロピレンのようなポリプロピレン系樹脂、ポリエチレンテレフタレートやポリエチレンナフタレートのようなポリエステル系樹脂、ポリカーボネート系樹脂等の熱可塑性樹脂であることができる。好ましくは、ポリエチレンテレフタレート等のポリエステル系樹脂である。
(1)硬化性接着剤組成物の調製
表1に示される成分を表1に示される配合量で混合して、硬化性接着剤組成物Aを調製した。表1に示される各成分の配合量の単位は質量部である。
(A):無水マレイン酸変性液状ポリブタジエン(Synthomer社製の商品名「Lithene ultra N4-5000-10MA」、数平均分子量:5500、25℃における粘度:25~60Pa・sec、酸価:54KOHmg/g)
(B-1a):ジシクロペンタニルアクリレート(日立化成株式会社製の商品名「FA-513AS」)
(B-1b):イソステアリルアクリレート(新中村化学工業株式会社製の商品名「S-1800A」)
(B-2):エトキシ化ビスフェノールAジアクリレート(新中村化学工業株式会社製の商品名「A-BPE-10」、EO 10モル)
(C):フェニルビス(2,4,6-トリメチルベンゾイル)ホスフィンオキサイド(
IGM Resins B.V.社製の商品名「Omnirad 819」)
(D):未変性液状ポリブタジエン(Synthomer社製の商品名「Lithene ultra PM4」、数平均分子量:1500、25℃における粘度:0.7~0.95Pa・sec)
(E):石油樹脂(JXTGエネルギー株式会社製の商品名「T-REZ HA105」、水添樹脂(ジシクロペンタジエンをモノマー成分とする脂環族飽和炭化水素樹脂)、軟化点(公称値):104.5℃、重量平均分子量(公称値):610)
厚み60μmのポリメチルメタクリレート(PMMA)フィルムの表面にコロナ処理を施し、そのコロナ処理面に、上記(1)で調製した硬化性接着剤組成物Aを接着剤塗工装置を用いて塗工した。得られた塗工層と厚み23μmのポリビニルアルコール-ヨウ素系偏光子とをニップロールを用いて積層し、PMMAフィルム付偏光子を得た。
配合成分の配合量を表1に示されるとおりに変更したこと以外は実施例1と同様にして硬化性接着剤組成物Aを調製した。また、この硬化性接着剤組成物Aを用いたこと以外は実施例1と同様にして偏光板を作製した。
(1)硬化性接着剤組成物Aから形成される硬化膜の透湿度
コロナ処理を施した厚み60μmのPMMAフィルムに、硬化性接着剤組成物Aを接着剤塗工装置を用いて塗工した。
硬化性接着剤組成物Aの塗工層上に未処理ポリエチレンテレフタレート(PET)フィルムを積層し、ニップロールを用いて貼合した。次いで、総積算光量(波長320~400nmの波長領域における光照射強度の積算量)が約200mJ/cm2(測定器:FusionUV社製UV Power PuckIIによる測定値)の紫外線(UVB)を照射することにより接着剤層を硬化させて、PMMAフィルム/硬化した接着剤層/PETフィルムの層構成を有する積層体を得た。その後、PETフィルムを剥離して、PMMAフィルム/硬化した接着剤層(硬化膜)の層構成を有する積層体(透湿度測定用サンプル)を得た。
結果を表1の「積層体の透湿度」の欄に示す。括弧内の数値は、積層体が有する硬化膜の厚み(単位:μm)を示す。
また、得られた積層体の透湿度(Jt)を用い、下記式に基づき、硬化膜それ自体の温度40℃、相対湿度90%における透湿度(J)を求めた。
1/Jt=(1/J)+(1/Jsub)
基材フィルムである厚み60μmのPMMAフィルムは、JIS Z 0208に規定されるカップ法により、温度40℃、相対湿度90%の条件下で測定される透湿度(Jsub)が70g/(m2・24hr)であった。
結果を表1の「硬化膜の透湿度」の欄に示す。括弧内の数値は、硬化膜の厚み(単位:μm)を示す。
得られた偏光板のPMMAフィルム側に粘着剤層を形成した。得られた粘着剤層付偏光板を長さ(偏光子の吸収軸方向と平行)200mm×幅25mmの大きさに裁断し、粘着剤層をガラス板に貼合して積層体を得た。得られた積層体を偏光子とPMMAフィルムとの間の剥離強さを測定するための試験片とした。試験片の偏光子とPMMAフィルムとの間にカッターの刃を入れ、長さ方向に端から30mm剥がして、その剥がした部分を試験機のつかみ部でつかみ、つかみ下部はガラス板をつかんだ。この状態の試験片について、温度23℃及び相対湿度55%の雰囲気中にて、JIS K 6854-2:1999「接着剤-はく離接着強さ試験方法-第2部:180度はく離」に準じて、つかみ移動速度300mm/分で剥離試験を行い、つかみ部の30mmを除く170mmの長さにわたる平均剥離力を求め、これを、偏光子とPMMAフィルムとの間の剥離強さとした。結果を表1に示す。剥離強さは、偏光板を作製してから温度23℃、相対湿度50%RHの環境下に24時間置いた後に測定した。
得られた偏光板のPMMAフィルム側に粘着剤層を形成した。得られた粘着剤層付偏光板を長さ(偏光子の吸収軸方向と平行)200mm×幅25mmの大きさに裁断し、粘着剤層をガラス板に貼合して積層体を得た。得られた積層体を温度80℃、相対湿度90%RHの高温高湿環境下に24時間置いた後、温度23℃、相対湿度50%RHの環境下に24時間置いた。その後、得られた積層体の偏光子とPMMAフィルムとの間にカッターの刃を入れ、長さ方向に端から30mm剥がして、その剥がした部分を試験機のつかみ部でつかみ、つかみ下部はガラス板をつかんだ。この状態の試験片について、温度23℃及び相対湿度55%の雰囲気中にて、JIS K 6854-2:1999「接着剤-はく離接着強さ試験方法-第2部:180度はく離」に準じて、つかみ移動速度300mm/分で剥離試験を行い、つかみ部の30mmを除く170mmの長さにわたる平均剥離力を求め、これを、偏光子とPMMAフィルムとの間の剥離強さとした。結果を表1に示す。
(1)硬化性接着剤組成物の調製
表2に示される成分を表2に示される配合量で混合して、硬化性接着剤組成物Cを調製した。表2に示される各成分の配合量の単位は質量部である。
(A):無水マレイン酸変性液状ポリブタジエン(Synthomer社製の商品名「Lithene ultra N4-5000-10MA」、数平均分子量:5500、25℃における粘度:25~60Pa・sec、酸価:54KOHmg/g)
(B-1a):ジシクロペンタニルアクリレート(日立化成株式会社製の商品名「FA-513AS」)
(B-1b):イソステアリルアクリレート(新中村化学工業株式会社製の商品名「S-1800A」)
(B-1c):ラウリルアクリレート(大阪有機化学工業株式会社製の商品名「LA」)
(B-1d):ブチルアクリレート(富士フィルム和光純薬株式会社製)
(B-2):エトキシ化ビスフェノールAジアクリレート(新中村化学工業株式会社製の商品名「A-BPE-10」、EO 10モル)
(C):フェニルビス(2,4,6-トリメチルベンゾイル)ホスフィンオキサイド(IGM Resins B.V.社製の商品名「Omnirad 819」)
(D):未変性液状ポリブタジエン(Synthomer社製の商品名「Lithene ultra PM4」、数平均分子量:1500、25℃における粘度:0.7~0.95Pa・sec)
(E):石油樹脂(JXTGエネルギー株式会社製の商品名「T-REZ HA105」、水添樹脂(ジシクロペンタジエンをモノマー成分とする脂環族飽和炭化水素樹脂)、軟化点(公称値):104.5℃、重量平均分子量(公称値):610)
厚み60μmのポリメチルメタクリレート(PMMA)フィルムの表面にコロナ処理を施し、そのコロナ処理面に、上記(1)で調製した硬化性接着剤組成物Cを接着剤塗工装置を用いて塗工した。得られた塗工層と厚み23μmのポリビニルアルコール-ヨウ素系偏光子とをニップロールを用いて積層し、PMMAフィルム付偏光子を得た。
配合成分の配合量を表2に示されるとおりに変更したこと以外は実施例4と同様にして硬化性接着剤組成物Cを調製した。また、この硬化性接着剤組成物Cを用いたこと以外は実施例4と同様にして偏光板を作製した。
(1)硬化性接着剤組成物Cから形成される硬化膜の透湿度
コロナ処理を施した厚み60μmのPMMAフィルムに、硬化性接着剤組成物Cを接着剤塗工装置を用いて塗工した。
硬化性接着剤組成物Cの塗工層上に未処理ポリエチレンテレフタレート(PET)フィルムを積層し、ニップロールを用いて貼合した。次いで、総積算光量(波長320~400nmの波長領域における光照射強度の積算量)が約200mJ/cm2(測定器:FusionUV社製UV Power PuckIIによる測定値)の紫外線(UVB)を照射することにより接着剤層を硬化させて、PMMAフィルム/硬化した接着剤層/PETフィルムの層構成を有する積層体を得た。その後、PETフィルムを剥離して、PMMAフィルム/硬化した接着剤層(硬化膜)の層構成を有する積層体(透湿度測定用サンプル)を得た。
結果を表2の「積層体の透湿度」の欄に示す。括弧内の数値は、積層体が有する硬化膜の厚み(単位:μm)を示す。
また、得られた積層体の透湿度(Jt)を用い、下記式に基づき、硬化膜それ自体の温度40℃、相対湿度90%における透湿度(J)を求めた。
1/Jt=(1/J)+(1/Jsub)
基材フィルムである厚み60μmのPMMAフィルムは、JIS Z 0208に規定されるカップ法により、温度40℃、相対湿度90%の条件下で測定される透湿度(Jsub)が70g/(m2・24hr)であった。
結果を表2の「硬化膜の透湿度」の欄に示す。括弧内の数値は、硬化膜の厚み(単位:μm)を示す。
得られた偏光板のPMMAフィルム側に粘着剤層を形成した。得られた粘着剤層付偏光板を長さ(偏光子の吸収軸方向と平行)200mm×幅25mmの大きさに裁断し、粘着剤層をガラス板に貼合して積層体を得た。得られた積層体を偏光子とPMMAフィルムとの間の剥離強さを測定するための試験片とした。試験片の偏光子とPMMAフィルムとの間にカッターの刃を入れ、長さ方向に端から30mm剥がして、その剥がした部分を試験機のつかみ部でつかみ、つかみ下部はガラス板をつかんだ。この状態の試験片について、温度23℃及び相対湿度55%の雰囲気中にて、JIS K 6854-2:1999「接着剤-はく離接着強さ試験方法-第2部:180度はく離」に準じて、つかみ移動速度300mm/分で剥離試験を行い、つかみ部の30mmを除く170mmの長さにわたる平均剥離力を求め、これを、偏光子とPMMAフィルムとの間の剥離強さとした。結果を表2に示す。剥離強さは、偏光板を作製してから温度23℃、相対湿度50%RHの環境下に24時間置いた後に測定した。
得られた偏光板のPMMAフィルム側に粘着剤層を形成した。得られた粘着剤層付偏光板を長さ(偏光子の吸収軸方向と平行)200mm×幅25mmの大きさに裁断し、粘着剤層をガラス板に貼合して積層体を得た。得られた積層体を温度80℃、相対湿度90%RHの高温高湿環境下に24時間置いた後、温度23℃、相対湿度50%RHの環境下に24時間置いた。その後、得られた積層体の偏光子とPMMAフィルムとの間にカッターの刃を入れ、長さ方向に端から30mm剥がして、その剥がした部分を試験機のつかみ部でつかみ、つかみ下部はガラス板をつかんだ。この状態の試験片について、温度23℃及び相対湿度55%の雰囲気中にて、JIS K 6854-2:1999「接着剤-はく離接着強さ試験方法-第2部:180度はく離」に準じて、つかみ移動速度300mm/分で剥離試験を行い、つかみ部の30mmを除く170mmの長さにわたる平均剥離力を求め、これを、偏光子とPMMAフィルムとの間の剥離強さとした。結果を表2に示す。
Claims (10)
- 無水マレイン酸変性化合物(A)、(メタ)アクリレート化合物(B)及び光重合開始剤(C)を含み、
前記(メタ)アクリレート化合物(B)は、単官能(メタ)アクリレート化合物(B-1)を含み、
前記単官能(メタ)アクリレート化合物(B-1)は、脂環式アルキル(メタ)アクリレート化合物及び直鎖又は分岐鎖のC4-C36アルキル(メタ)アクリレート化合物を含む硬化性接着剤組成物。 - 前記単官能(メタ)アクリレート化合物(B-1)の含有量が、前記(メタ)アクリレート化合物(B)100質量%中、60質量%以上99質量%以下である請求項1に記載の硬化性接着剤組成物。
- 前記脂環式アルキル(メタ)アクリレート化合物の含有量が、前記脂環式アルキル(メタ)アクリレート化合物及び前記直鎖又は分岐鎖のC4-C36アルキル(メタ)アクリレート化合物の合計量100質量%中、5質量%以上80質量%以下である請求項1又は2に記載の硬化性接着剤組成物。
- 未変性ポリブタジエン(D)をさらに含む請求項1~3のいずれか1項に記載の硬化性接着剤組成物。
- 前記無水マレイン酸変性化合物(A)の含有量が、前記無水マレイン酸変性化合物(A)及び未変性ポリブタジエン(B)の合計量100質量%中、40質量%以上90質量%以下である請求項4に記載の硬化性接着剤組成物。
- 石油樹脂(E)をさらに含む請求項1~5のいずれか1項に記載の硬化性接着剤組成物。
- 前記無水マレイン酸変性化合物(A)は、無水マレイン酸変性重合体(A-1)を含む請求項1~6のいずれか1項に記載の硬化性接着剤組成物。
- 前記硬化性接着剤組成物からなる厚み10μmの硬化膜は、温度40℃、相対湿度90%において400g/(m2・24hr)以下の透湿度を有する請求項1~7のいずれか1項に記載の硬化性接着剤組成物。
- 偏光子、接着剤層及び熱可塑性樹脂フィルムをこの順に含む偏光板であって、
前記接着剤層は、請求項1~8のいずれか1項に記載の硬化性接着剤組成物の硬化物層である偏光板。 - 前記熱可塑性樹脂フィルムは、(メタ)アクリル系樹脂フィルムである請求項9に記載の偏光板。
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