WO2010018795A1 - 粘着剤付き光学フィルムとそれを用いた光学積層体 - Google Patents
粘着剤付き光学フィルムとそれを用いた光学積層体 Download PDFInfo
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- WO2010018795A1 WO2010018795A1 PCT/JP2009/064039 JP2009064039W WO2010018795A1 WO 2010018795 A1 WO2010018795 A1 WO 2010018795A1 JP 2009064039 W JP2009064039 W JP 2009064039W WO 2010018795 A1 WO2010018795 A1 WO 2010018795A1
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- film
- optical film
- pressure
- sensitive adhesive
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- HHBOIIOOTUCYQD-UHFFFAOYSA-N ethoxy-dimethyl-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](C)(C)CCCOCC1CO1 HHBOIIOOTUCYQD-UHFFFAOYSA-N 0.000 description 1
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- 230000001678 irradiating effect Effects 0.000 description 1
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- 150000002576 ketones Chemical class 0.000 description 1
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 125000005641 methacryl group Chemical group 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
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- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- PHQOGHDTIVQXHL-UHFFFAOYSA-N n'-(3-trimethoxysilylpropyl)ethane-1,2-diamine Chemical compound CO[Si](OC)(OC)CCCNCCN PHQOGHDTIVQXHL-UHFFFAOYSA-N 0.000 description 1
- MQWFLKHKWJMCEN-UHFFFAOYSA-N n'-[3-[dimethoxy(methyl)silyl]propyl]ethane-1,2-diamine Chemical compound CO[Si](C)(OC)CCCNCCN MQWFLKHKWJMCEN-UHFFFAOYSA-N 0.000 description 1
- JAYXSROKFZAHRQ-UHFFFAOYSA-N n,n-bis(oxiran-2-ylmethyl)aniline Chemical compound C1OC1CN(C=1C=CC=CC=1)CC1CO1 JAYXSROKFZAHRQ-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- KKFHAJHLJHVUDM-UHFFFAOYSA-N n-vinylcarbazole Chemical compound C1=CC=C2N(C=C)C3=CC=CC=C3C2=C1 KKFHAJHLJHVUDM-UHFFFAOYSA-N 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- KNZIIQMSCLCSGZ-UHFFFAOYSA-N non-1-enylbenzene Chemical compound CCCCCCCC=CC1=CC=CC=C1 KNZIIQMSCLCSGZ-UHFFFAOYSA-N 0.000 description 1
- RCALDWJXTVCBAZ-UHFFFAOYSA-N oct-1-enylbenzene Chemical compound CCCCCCC=CC1=CC=CC=C1 RCALDWJXTVCBAZ-UHFFFAOYSA-N 0.000 description 1
- NWAHZAIDMVNENC-UHFFFAOYSA-N octahydro-1h-4,7-methanoinden-5-yl methacrylate Chemical compound C12CCCC2C2CC(OC(=O)C(=C)C)C1C2 NWAHZAIDMVNENC-UHFFFAOYSA-N 0.000 description 1
- NZIDBRBFGPQCRY-UHFFFAOYSA-N octyl 2-methylprop-2-enoate Chemical compound CCCCCCCCOC(=O)C(C)=C NZIDBRBFGPQCRY-UHFFFAOYSA-N 0.000 description 1
- ANISOHQJBAQUQP-UHFFFAOYSA-N octyl prop-2-enoate Chemical compound CCCCCCCCOC(=O)C=C ANISOHQJBAQUQP-UHFFFAOYSA-N 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 150000002891 organic anions Chemical class 0.000 description 1
- YNXCGLKMOXLBOD-UHFFFAOYSA-N oxolan-2-ylmethyl prop-2-enoate Chemical class C=CC(=O)OCC1CCCO1 YNXCGLKMOXLBOD-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 description 1
- YPVDWEHVCUBACK-UHFFFAOYSA-N propoxycarbonyloxy propyl carbonate Chemical compound CCCOC(=O)OOC(=O)OCCC YPVDWEHVCUBACK-UHFFFAOYSA-N 0.000 description 1
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- 239000012966 redox initiator Substances 0.000 description 1
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- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-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
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- 230000036962 time dependent Effects 0.000 description 1
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- 239000011135 tin Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- IUCJMVBFZDHPDX-UHFFFAOYSA-N tretamine Chemical compound C1CN1C1=NC(N2CC2)=NC(N2CC2)=N1 IUCJMVBFZDHPDX-UHFFFAOYSA-N 0.000 description 1
- 229950001353 tretamine Drugs 0.000 description 1
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 description 1
- 125000001889 triflyl group Chemical group FC(F)(F)S(*)(=O)=O 0.000 description 1
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- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- 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
-
- 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
- C09J133/00—Adhesives based on homopolymers or 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- 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 an optical film having an adhesive layer formed thereon.
- the optical film to be used in the present invention include a polarizing plate and a retardation film.
- the present invention also relates to an optical laminate for liquid crystal display using an optical film in which this pressure-sensitive adhesive layer is formed.
- a polarizing plate is mounted on a liquid crystal display device and is widely used.
- a transparent protective film is laminated on both surfaces of a polarizer, and an adhesive layer is formed on the surface of at least one protective film. It is distributed in the state where the release film is stuck to.
- a retardation film may be laminated on a polarizing plate in which a protective film is bonded to both surfaces of the polarizer to form an elliptical polarizing plate, and an adhesive layer / release film may be attached to the retardation film side. is there.
- an adhesive layer / release film may be stuck on the surface of the retardation film.
- the release film Prior to bonding to the liquid crystal cell, the release film is peeled off from these polarizing plate, elliptical polarizing plate, retardation film, etc., and bonded to the liquid crystal cell via the exposed adhesive layer.
- a polarizing plate, elliptical polarizing plate, or retardation film generates static electricity when the release film is peeled off and bonded to a liquid crystal cell, and therefore development of a countermeasure for the prevention is desired.
- Patent Document 1 in a polarizing plate in which a protective film is laminated on the surface of a polarizer film and an adhesive layer is provided on the surface of the protective film,
- an adhesive it has been proposed to use an ion conductive composition comprising an electrolyte salt and an organopolysiloxane and a composition containing an acrylic copolymer.
- Patent Document 2 discloses that an organic salt-based antistatic agent is blended with a pressure-sensitive adhesive (adhesive) to impart antistatic properties to the adhesive. It is disclosed.
- Patent Document 3 includes a salt made of a quaternary ammonium cation having a total carbon number of 4 to 20 and a fluorine atom-containing anion in an adhesive or the like, thereby improving antistatic properties. It is described to give. Furthermore, Japanese Patent Application Laid-Open No.
- Patent Document 4 describes that an adhesive contains an ionic liquid that becomes liquid at room temperature (25 ° C.) to prevent charging, and Japanese Patent Application Laid-Open No. 2006-16595.
- Patent Document 5 describes an antistatic pressure-sensitive adhesive composition comprising an ionic liquid, an ethylene oxide-containing compound, and a polymer having a glass transition temperature Tg of 0 ° C. or less as a base polymer. .
- Tg glass transition temperature
- the optical film with an adhesive as described above is bonded to a liquid crystal cell on the adhesive layer side to form a liquid crystal display device.
- the optical film is placed under high temperature or high temperature and high humidity conditions, or heated.
- foaming occurs in the pressure-sensitive adhesive layer as the optical film changes in size, or it floats or peels between the optical film and the pressure-sensitive adhesive layer, or between the pressure-sensitive adhesive layer and the liquid crystal cell glass. Therefore, it is also required to have excellent durability without causing such problems.
- Patent Document 6 discloses an antistatic acrylic pressure-sensitive adhesive containing an acrylic copolymer having an alkylene oxide chain such as a hydroxyl group and an ethylene oxide chain in the side chain, an ionic compound, and a curing agent. It is disclosed. However, the ionic compound used in Patent Document 6 is only an ionic compound having an inorganic cation such as a Li salt, and such an ionic compound has a problem of poor compatibility with the base polymer of the pressure-sensitive adhesive. It was.
- An object of the present invention is to provide an optical film with a pressure-sensitive adhesive provided with a pressure-sensitive adhesive layer on the surface of the optical film, which is provided with a high antistatic property, the antistatic property hardly changes with time, and is excellent in durability. There is to do.
- the present inventors blended a specific acrylic resin with an ionic compound that is solid at room temperature (25 ° C.) and a crosslinking agent, and this composition. It was found that an optical film with an adhesive excellent in antistatic property, antistatic property change with time and durability can be obtained by providing as a pressure-sensitive adhesive layer on the surface of the optical film.
- the pressure-sensitive adhesive layer is formed on at least one surface of the optical film, and the pressure-sensitive adhesive layer contains the following components (A), (B), and (C).
- An optical film with a pressure-sensitive adhesive formed from the above is provided.
- ether-type (meth) acrylic acid ester represented by the formula (hereinafter sometimes referred to as “ether-type (meth) acrylic acid ester”) 5 to 40% by weight
- (A-3) 0.1 to 5% by weight of an unsaturated monomer having a polar functional group 100 parts by weight of an acrylic resin which is a copolymer obtained from a monomer mixture containing (B) 0.3 to 12 parts by weight of an ionic compound having an organic
- an antistatic property to the adhesive layer formed from the adhesive composition containing the specific acrylic resin (A) prescribed
- an antistatic agent for this purpose, it has been found that an ionic compound (B) that is solid at room temperature (25 ° C.) is particularly effective.
- an optical laminate in which the above-mentioned optical film with an adhesive is laminated on a glass substrate on the adhesive layer side.
- the optical film with a pressure-sensitive adhesive of the present invention can effectively suppress charging of the optical member.
- an ionic compound that has an organic cation and is solid at room temperature in the pressure-sensitive adhesive composition it is possible to maintain the initial antistatic performance even after storage for a long time. It is.
- This optical film with an adhesive gives, for example, an optical laminate for liquid crystal display by being laminated on a glass substrate of a liquid crystal cell.
- the pressure-sensitive adhesive layer absorbs and relaxes stress caused by dimensional changes of the optical film and glass substrate under wet heat conditions, so that local stress concentration is reduced and the pressure-sensitive adhesive layer floats on the glass substrate. And peeling are suppressed.
- the optical film with a pressure-sensitive adhesive of the present invention is one in which a pressure-sensitive adhesive layer is formed on at least one side of the optical film, (A) acrylic resin, (B) an ionic compound having an organic cation and being solid at room temperature, and (C) It is formed from a composition containing a crosslinking agent.
- a pressure-sensitive adhesive layer is formed on at least one side of the optical film, (A) acrylic resin, (B) an ionic compound having an organic cation and being solid at room temperature, and (C) It is formed from a composition containing a crosslinking agent.
- the acrylic resin (A) used for the pressure-sensitive adhesive layer is mainly composed of a structural unit derived from the (meth) acrylic acid ester represented by the formula (I).
- a structural unit derived from the ether type (meth) acrylic acid ester represented by the formula (II) a free carboxyl group, a hydroxyl group, It includes a structural unit derived from a monomer having a polar functional group such as an amino group or a heterocyclic group including an epoxy ring, preferably a (meth) acrylic acid compound having a polar functional group.
- (meth) acrylic acid means that either acrylic acid or methacrylic acid may be used, and “(meth)” when referred to as (meth) acrylate or the like has the same meaning.
- R 1 is a hydrogen atom or a methyl group
- R 2 is an alkyl group or an aralkyl group having 1 to 14 carbon atoms, preferably an alkyl group. is there.
- (meth) acrylic acid ester (A-1) represented by the formula (I) those in which R 2 is an alkyl group, specifically, methyl acrylate, ethyl acrylate, propyl acrylate, acrylic acid linear alkyl acrylates such as n-butyl, n-octyl acrylate and lauryl acrylate; branched alkyl acrylates such as isobutyl acrylate, 2-ethylhexyl acrylate and isooctyl acrylate; Linear alkyl methacrylates such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, lauryl methacrylate; isobutyl methacrylate, 2-ethylhexyl methacrylate, methacryl Branched media such as isooctyl acid Such as acrylic acid alkyl ester
- (meth) acrylic acid ester represented by the formula (I) when R 2 is an aralkyl group include benzyl acrylate and benzyl methacrylate.
- These (meth) acrylic acid esters (A-1) can be used alone or in combination with a plurality of different ones.
- n-butyl acrylate is preferable. Specifically, among all the monomers constituting the acrylic resin (A), n-butyl acrylate is 50% by weight or more, and the above-described one is used. It is preferable to use it so as to satisfy the regulations regarding (meth) acrylic acid ester (A-1).
- the ether type (meth) acrylic acid ester (A-2) is represented by the above formula (II).
- Specific examples of the ether type (meth) acrylic acid ester (A-2) represented by the formula (II) include 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, 2-methoxy-2-ethoxyethyl acrylate And 2-methoxyethyl methacrylate, 2-ethoxyethyl methacrylate, 2-methoxy-2-ethoxyethyl methacrylate and the like.
- These ether type (meth) acrylic acid esters (A-2) can also be used alone or in combination with a plurality of different types.
- 2-methoxyethyl acrylate is preferably used as one of the (meth) acrylic acid esters (A-2) constituting the acrylic resin (A).
- Examples of the unsaturated monomer (A-3) having a polar functional group include monomers having a free carboxyl group such as acrylic acid, methacrylic acid, ⁇ -carboxyethyl acrylate; (meth) acrylic acid 2- Monomers having a hydroxyl group such as hydroxyethyl, 2-hydroxypropyl (meth) acrylate, 2- or 3-chloro-2-hydroxypropyl (meth) acrylate, and diethylene glycol mono (meth) acrylate; acryloylmorpholine, vinyl Caprolactam, N-vinyl-2-pyrrolidone, tetrahydrofurfuryl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, glycidyl (meth) acrylate, 2,5-dihydrofuran Like Monomers having a heterocyclic group; N, such as N
- the polar functional group of the unsaturated monomer (A-3) is preferably a free carboxyl group, a hydroxyl group, an amino group, or an epoxy ring.
- a monomer having a hydroxyl group is preferably used as one of the polar functional group-containing monomers (A-3) constituting the acrylic resin (A).
- it is also effective to use a monomer having another polar functional group for example, a monomer having a free carboxyl group.
- the acrylic resin (A) used for the pressure-sensitive adhesive layer is 55 to 94% by weight of the (meth) acrylic acid ester (A-1) represented by the formula (I) and the ether type represented by the formula (II) ( A copolymer obtained from a monomer mixture containing 5 to 40% by weight of (meth) acrylic acid ester (A-2) and 0.1 to 5% by weight of unsaturated monomer (A-3) having a polar functional group. It is a polymer.
- the structural unit derived from the (meth) acrylic acid ester (A-1) represented by the formula (I) is preferably 70 to 94% by weight, more preferably 72 to 94% by weight,
- the acrylic resin (A) used in the present invention comprises the above-described (meth) acrylic acid ester of the formula (I), an ether type (meth) acrylic acid ester of the formula (II) and an unsaturated group having a polar functional group.
- a structural unit derived from a monomer other than the monomer may be included. Examples of these include structural units derived from (meth) acrylic acid esters having an alicyclic structure in the molecule, structural units derived from styrene monomers, structural units derived from vinyl monomers, molecules Examples thereof include a structural unit derived from a monomer having a plurality of (meth) acryloyl groups.
- the alicyclic structure is a cycloparaffin structure having usually 5 or more carbon atoms, preferably about 5 to 7 carbon atoms.
- Specific examples of the acrylate ester having an alicyclic structure include isobornyl acrylate, cyclohexyl acrylate, dicyclopentanyl acrylate, cyclododecyl acrylate, methylcyclohexyl acrylate, trimethylcyclohexyl acrylate, tert-butyl acrylate
- methacrylic acid esters having an alicyclic structure include isobornyl methacrylate, cyclohexyl methacrylate, dicyclopentanyl methacrylate, methacrylic acid, and the like, such as cyclohexyl, ⁇ -ethoxyacrylate cyclohexyl, and cyclohexyl phenyl acrylate.
- styrenic monomers examples include styrene, alkyl styrene such as methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, diethyl styrene, triethyl styrene, propyl styrene, butyl styrene, hexyl styrene, heptyl styrene, octyl styrene.
- alkyl styrene such as methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, diethyl styrene, triethyl styrene, propyl styrene, butyl styrene, hexyl styrene,
- Halogenated styrenes such as fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene, iodostyrene; and nitrostyrene, acetylstyrene, methoxystyrene, divinylbenzene and the like.
- vinyl monomers include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate and vinyl laurate; vinyl halides such as vinyl chloride and vinyl bromide; vinylidene chloride And vinylidene halides such as: nitrogen-containing aromatic vinyl such as vinylpyridine, vinylpyrrolidone and vinylcarbazole; conjugated diene monomers such as butadiene, isoprene and chloroprene; and acrylonitrile and methacrylonitrile.
- vinyl halides such as vinyl chloride and vinyl bromide
- vinylidene chloride And vinylidene halides such as: nitrogen-containing aromatic vinyl such as vinylpyridine, vinylpyrrolidone and vinylcarbazole; conjugated diene monomers such as butadiene, isoprene and chloroprene; and acrylonitrile and methacrylonitrile.
- Examples of monomers having a plurality of (meth) acryloyl groups in the molecule include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and 1,9-nonanediol.
- Monomers other than the (meth) acrylic acid ester of the formula (I), the ether type (meth) acrylic acid ester of the formula (II) and the unsaturated monomer having a polar functional group are each alone or two kinds These can be used in combination.
- a unit other than the (meth) acrylic acid ester of the formula (I), the ether type (meth) acrylic acid ester of the formula (II) and a monomer having a polar functional group is usually contained in a proportion of 0 to 20 parts by weight, preferably 0 to 10 parts by weight, based on 100 parts by weight of the nonvolatile content of the resin.
- the active ingredient of the pressure-sensitive adhesive is a structure derived from a monomer having a (meth) acrylate ester of the formula (I), an ether type (meth) acrylate ester of the formula (II) and a polar functional group as described above. Two or more kinds of acrylic resins containing units may be included. Further, the acrylic resin is mixed with an acrylic resin different from the acrylic resin, specifically, for example, an acrylic resin having a structural unit derived from the (meth) acrylic ester of the formula (I) and containing no polar functional group. It may be what you did.
- An acrylic resin containing a structural unit derived from a monomer having a polar functional group, the main component of which is a structural unit derived from the (meth) acrylic acid ester of the formula (I) is 60% by weight or more of the whole acrylic resin. Further, it is preferably 80% by weight or more.
- an acrylic resin which is a copolymer obtained from a monomer mixture containing a (meth) acrylic acid ester of the formula (I), an ether type (meth) acrylic acid ester of the formula (II) and a monomer having a polar functional group
- the weight average molecular weight is 2 million or less, even if the dimension of the optical film bonded to the pressure-sensitive adhesive layer changes, the pressure-sensitive adhesive layer fluctuates following the dimensional change. This is preferable because there is no difference between the brightness of the peripheral edge and the brightness of the center, and white spots and color unevenness tend to be suppressed.
- the molecular weight distribution represented by the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is usually in the range of about 2 to 10.
- the acrylic resin (A) preferably has a glass transition temperature in the range of ⁇ 10 to ⁇ 60 ° C. in order to develop adhesiveness.
- the glass transition temperature of the resin can generally be measured with a differential scanning calorimeter.
- This acrylic resin can be composed only of a relatively high molecular weight as described above, or it can be composed of a mixture of an acrylic resin different from the acrylic resin in addition to the acrylic resin.
- the acrylic resin that can be used as a mixture include those having a structural unit derived from the (meth) acrylic acid ester represented by the formula (I) as a main component and having a weight average molecular weight in the range of 50,000 to 300,000. Can be mentioned.
- Acrylic resin (a mixture of both when two or more types are combined) is a solution prepared by dissolving it in ethyl acetate to a non-volatile content of 20% by weight, at 25 ° C., 20 Pa ⁇ s or less, and further 0.1 to 7 Pa.
- -It is preferable to show the viscosity of s. If the viscosity at this time is 20 Pa ⁇ s or less, the adhesiveness under high temperature and high humidity is improved, and the possibility of floating or peeling between the glass substrate and the pressure-sensitive adhesive layer tends to be reduced. Moreover, it is preferable because reworkability tends to be improved. Viscosity can be measured with a Brookfield viscometer.
- the acrylic resin constituting the pressure-sensitive adhesive layer can be produced by various known methods such as a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a suspension polymerization method.
- a polymerization initiator is usually used.
- the polymerization initiator is used in an amount of about 0.001 to 5 parts by weight with respect to a total of 100 parts by weight of all monomers used for the production of the acrylic resin.
- the polymerization initiator a thermal polymerization initiator, a photopolymerization initiator, or the like is used.
- the photopolymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone.
- thermal polymerization initiators examples include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane-1-carbonitrile), 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl-2,2'-azobis (2-methylpropio) Azo) compounds such as 2,2'-azobis (2-hydroxymethylpropionitrile); lauryl peroxide, tert-butyl hydroperoxide, benzoyl peroxide, tert-butyl peroxybenzoate, cumene hydroperoxide , Diisopropyl peroxydicarbonate, dipropyl peroxydicarbonate, tert-butyl peroxy Organic peroxides such as neodecanoate, tert-butyl peroxypivalate, (3,5,5-trimethyl
- the solution polymerization method is preferable among the methods shown above.
- a specific example of the solution polymerization method will be described below.
- a desired monomer and an organic solvent are mixed, and a thermal polymerization initiator is added under a nitrogen atmosphere, and the temperature is about 40 to 90 ° C., preferably 60 to 80 ° C.
- An example is a method of stirring at about 0 ° C. for about 3 to 10 hours.
- a monomer or a thermal polymerization initiator may be added continuously or intermittently during the polymerization, or may be added in a state dissolved in an organic solvent.
- organic solvent examples include aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; aliphatic alcohols such as propyl alcohol and isopropyl alcohol; acetone, methyl ethyl ketone, and methyl isobutyl ketone. Ketones such as can be used.
- an ionic compound (B) that is solid at room temperature is used as an antistatic agent.
- This ionic compound (B) has an organic cation.
- Such ionic compounds that are solid at room temperature may be referred to herein as ionic solids.
- the cation component constituting the ionic compound (B) is not particularly limited as long as it is an organic cation satisfying that it becomes an ionic solid.
- imidazolium cation, pyridinium cation, ammonium cation, sulfonium cation, phosphonium cation, etc. are mentioned, but when used in the adhesive layer of an optical film, it is difficult to be charged when peeling the release film provided on it. From the viewpoint, a pyridinium cation and an imidazolium cation are preferable.
- the anion component serving as the counter ion of the cation component is not particularly limited as long as it satisfies that it becomes an ionic solid, and may be an inorganic anion, Organic anions may be used, and examples include the following.
- an anion component containing a fluorine atom is preferably used because it gives an ionic solid excellent in antistatic performance, and a hexafluorophosphate anion or a bis (trifluoromethanesulfonyl) imide anion is particularly preferable.
- ionic solid used in the present invention can be appropriately selected from the combination of the cation component and the anion component.
- Specific examples of the compound that is a combination of a cation component and an anion component include the following.
- Such ionic solids can be used alone or in combination of two or more. Examples of ionic solids are not limited to the materials listed above.
- the ionic compound (B) that is solid at room temperature imparts antistatic properties to the pressure-sensitive adhesive layer formed from the composition containing the acrylic resin (A) and maintains various physical properties as a pressure-sensitive adhesive. It is effective in. In particular, compared with the case of using an ionic compound that is liquid at room temperature, the antistatic performance can be maintained for a long period of time. From the viewpoint of such antistatic long-term stability, the ionic compound (B) preferably has a melting point of 30 ° C. or higher, more preferably 35 ° C. or higher. On the other hand, when the melting point is too high, the compatibility with the acrylic resin (A) is deteriorated, so that it preferably has a melting point of 90 ° C. or lower, more preferably 80 ° C. or lower.
- the molecular weight of the ionic compound (B) is not particularly limited, but for example, the molecular weight is preferably 700 or less, and more preferably 500 or less.
- the ionic compound (B) is contained in a proportion of 0.3 to 12 parts by weight with respect to 100 parts by weight of the nonvolatile content of the acrylic resin (A).
- the ionic compound (B) is contained in an amount of 0.3 part by weight or more with respect to 100 parts by weight of the nonvolatile content of the acrylic resin (A)
- the antistatic performance is improved, and the amount is 12 parts by weight or less. It is preferable because durability is easy to maintain.
- the amount of the ionic compound (B) with respect to 100 parts by weight of the nonvolatile content of the acrylic resin (A) is preferably 0.5 parts by weight or more and 5 parts by weight or less.
- Crosslinking agent (C) A crosslinking agent (C) is further blended into the acrylic resin (A) and the ionic compound (B) as described above to obtain a pressure-sensitive adhesive composition.
- the crosslinking agent (C) is a compound having in the molecule at least two functional groups capable of crosslinking with a structural unit derived from the unsaturated monomer (A-3) having a polar functional group in the acrylic resin (A). Specifically, an isocyanate compound, an epoxy compound, a metal chelate compound, an aziridine compound and the like are exemplified.
- Isocyanate compounds are compounds having at least two isocyanato groups (—NCO) in the molecule, such as tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, diphenylmethane diisocyanate, Examples thereof include hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, and triphenylmethane triisocyanate.
- —NCO isocyanato groups
- adducts obtained by reacting these isocyanate compounds with polyols such as glycerol and trimethylolpropane, and those obtained by converting isocyanate compounds into dimers, trimers, and the like can also be used as crosslinking agents for pressure-sensitive adhesives. Two or more isocyanate compounds can be mixed and used.
- the epoxy compound is a compound having at least two epoxy groups in the molecule, for example, bisphenol A type epoxy resin, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether. 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, N, N-diglycidylaniline, N, N, N ′, N′-tetraglycidyl-m-xylenediamine, 1,3-bis ( N, N-diglycidylaminomethyl) cyclohexane and the like. Two or more types of epoxy compounds can be mixed and used.
- metal chelate compound examples include compounds in which acetylacetone or ethyl acetoacetate is coordinated to a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium and zirconium. Can be mentioned.
- An aziridine-based compound is a compound having at least two 3-membered ring skeletons composed of one nitrogen atom and two carbon atoms, also called ethyleneimine, for example, diphenylmethane-4,4′-bis ( 1-aziridinecarboxamide), toluene-2,4-bis (1-aziridinecarboxamide), triethylenemelamine, isophthaloylbis-1- (2-methylaziridine), tris-1-aziridinylphosphine oxide, hexamethylene -1,6-bis (1-aziridinecarboxamide), trimethylolpropane-tri- ⁇ -aziridinylpropionate, tetramethylolmethane-tri- ⁇ -aziridinylpropionate, and the like.
- isocyanate compounds especially xylylene diisocyanate, tolylene diisocyanate or hexamethylene diisocyanate, or adducts obtained by reacting these isocyanate compounds with polyols such as glycerol and trimethylolpropane, and isocyanate compounds A dimer, trimer or the like, or a mixture of these isocyanate compounds is preferably used.
- the polar functional group-containing unsaturated monomer (A-3) has a polar functional group selected from a free carboxyl group, a hydroxyl group, an amino group, and an epoxy ring, as at least one of the crosslinking agent (C), It is preferable to use an isocyanate compound.
- suitable isocyanate compounds include tolylene diisocyanate, adducts obtained by reacting tolylene diisocyanate with polyols, tolylene diisocyanate dimers, and tolylene diisocyanate trimers, hexamethylene diisocyanate, and hexamethylene diisocyanate. Examples include adducts reacted with polyols, dimers of hexamethylene diisocyanate, and trimers of hexamethylene diisocyanate.
- the crosslinking agent (C) is blended at a ratio of 0.1 to 5 parts by weight, preferably about 0.2 to 3 parts by weight, with respect to 100 parts by weight of the acrylic resin (A).
- the amount of the crosslinking agent (C) relative to 100 parts by weight of the acrylic resin (A) is preferably 0.1 parts by weight or more because the durability of the pressure-sensitive adhesive layer tends to be improved, and is 5 parts by weight or less. And, when the optical film with a pressure-sensitive adhesive is applied to a liquid crystal display device, white spots are not noticeable.
- the pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer in the present invention preferably contains a silane-based compound (D) in order to improve the adhesion between the pressure-sensitive adhesive layer and the glass substrate. It is preferable to contain the silane compound (D) in the acrylic resin before blending the agent.
- silane compound (D) examples include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- ( 2-aminoethyl) -3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxy (Cyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-glycidoxypropyltrime
- the silane compound (D) may be of a silicone oligomer type.
- silicone oligomer in the form of a copolymer include the following.
- the compounding amount of the silane compound in the pressure-sensitive adhesive composition is usually about 0.01 to 10 parts by weight with respect to 100 parts by weight of the nonvolatile content of the acrylic resin (A) (the total weight when two or more kinds are used).
- the ratio is preferably 0.03 to 1 part by weight. It is preferable that the amount of the silane compound with respect to 100 parts by weight of the acrylic resin is 0.01 parts by weight or more, particularly 0.03 parts by weight or more because adhesion between the pressure-sensitive adhesive layer and the glass substrate is improved. Moreover, it is preferable for the amount to be 10 parts by weight or less, particularly 1 part by weight or less, because the silane compound tends to be suppressed from bleeding out from the pressure-sensitive adhesive layer.
- the pressure-sensitive adhesive composition described above may further contain a crosslinking catalyst, weathering stabilizer, tackifier, plasticizer, softener, dye, pigment, inorganic filler, resin other than the acrylic resin (A), and the like. It is also useful to blend an ultraviolet curable compound into the pressure-sensitive adhesive composition and to cure it by irradiating with ultraviolet rays after forming the pressure-sensitive adhesive layer to form a harder pressure-sensitive adhesive layer.
- a crosslinking catalyst is blended with the crosslinking agent in the pressure-sensitive adhesive composition, the pressure-sensitive adhesive layer can be prepared by aging in a short time, and in the resulting resin film with a pressure-sensitive adhesive, between the resin film and the pressure-sensitive adhesive layer.
- the crosslinking catalyst examples include amine compounds such as hexamethylenediamine, ethylenediamine, polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethylenetetramine, isophoronediamine, trimethylenediamine, polyamino resin, and melamine resin.
- an isocyanate compound is suitable as the crosslinking agent.
- These components constituting the pressure-sensitive adhesive composition are coated on a suitable base material in a state dissolved in a solvent and dried to form a pressure-sensitive adhesive layer.
- optical film with adhesive The optical film with a pressure-sensitive adhesive of the present invention is obtained by providing a pressure-sensitive adhesive layer formed of the above pressure-sensitive adhesive composition on at least one surface of an optical film.
- the optical film used here is a film having optical characteristics, and examples thereof include a polarizing plate and a retardation film.
- a polarizing plate is an optical film having a function of emitting polarized light with respect to incident light such as natural light.
- the polarizing plate absorbs linearly polarized light having a vibrating surface in a certain direction and reflects linearly polarized light having a vibrating surface in a certain direction, and reflects linearly polarized light having a vibrating surface in a certain direction.
- a dichroic dye such as iodine or a dichroic dye is added to a uniaxially stretched polyvinyl alcohol resin film.
- a dichroic dye such as iodine or a dichroic dye is added to a uniaxially stretched polyvinyl alcohol resin film.
- the retardation film is an optical film exhibiting optical anisotropy, for example, polyvinyl alcohol, polycarbonate, polyester, polyarylate, polyimide, polyolefin, cyclic polyolefin, polystyrene, polysulfone, polyethersulfone, polyvinylidene fluoride.
- Stretched film obtained by stretching a polymer film made of polymethyl methacrylate, liquid crystal polyester, acetylcellulose, saponified ethylene-vinyl acetate copolymer, polyvinyl chloride, etc. by about 1.01 to 6 times. It is done.
- a polymer film obtained by uniaxially or biaxially stretching a polycarbonate film or a cyclic polyolefin film is preferable.
- a uniaxial phase difference film a wide viewing angle phase difference film, a low photoelasticity phase difference film, etc., it is applicable to all.
- a film that exhibits optical anisotropy by applying and orienting a liquid crystalline compound and a film that exhibits optical anisotropy by applying an inorganic layered compound can be used as the retardation film.
- Such retardation films include what are called temperature-compensated retardation films, and films with a twisted orientation of rod-like liquid crystals sold under the trade name “LC film” by Nippon Oil Corporation.
- LC film a film with a tilted orientation of a rod-shaped liquid crystal sold under the trade name “NH film” by Shin Nippon Oil Co., Ltd., and a disk-shaped liquid crystal sold under the trade name “WV film” by FUJIFILM Corporation.
- VAC film a film with a tilt orientation
- new VAC film a fully biaxially oriented film sold by Sumitomo Chemical Co., Ltd. under the name “VAC film”
- VAC film a fully biaxially oriented film sold by Sumitomo Chemical Co., Ltd. under the name “VAC film”
- VAC film a fully biaxially oriented film sold by Sumitomo Chemical Co., Ltd. under the name “VAC film”
- new VAC film a product name
- a transparent resin film is used, and as the transparent resin, for example, an acetyl cellulose resin typified by triacetyl cellulose or diacetyl cellulose, a methacrylic resin typified by polymethyl methacrylate, a polyester resin, or a polyolefin Resin, polycarbonate resin, polyether ether ketone resin, polysulfone resin and the like.
- the resin constituting the protective film may contain an ultraviolet absorber such as a salicylic acid ester compound, a benzophenone compound, a benzotriazole compound, a triazine compound, a cyanoacrylate compound, or a nickel complex compound.
- an acetyl cellulose resin film such as a triacetyl cellulose film is preferably used.
- the linearly polarizing plate is used in a state where a protective film is attached to one or both sides of a polarizer constituting the polarizer, for example, a polarizer film made of a polyvinyl alcohol-based resin.
- a polarizer constituting the polarizer
- the elliptically polarizing plate described above is a laminate of a linearly polarizing plate and a retardation film, and the polarizing plate may also be in a state where a protective film is attached to one or both sides of the polarizer film.
- the pressure-sensitive adhesive layer according to the present invention is formed on such an elliptically polarizing plate, the pressure-sensitive adhesive layer is usually formed on the retardation film side.
- the optical film with a pressure-sensitive adhesive has a release film attached to the surface of the pressure-sensitive adhesive layer and protects the surface of the pressure-sensitive adhesive layer until use.
- the optical film with the pressure-sensitive adhesive provided with the release film in this manner is formed by, for example, applying the above-mentioned pressure-sensitive adhesive composition on the release film to form a pressure-sensitive adhesive layer, and further optically applying the obtained pressure-sensitive adhesive layer.
- a method of laminating a film a method of applying a pressure-sensitive adhesive composition on an optical film to form a pressure-sensitive adhesive layer, attaching a release film to the surface of the pressure-sensitive adhesive to protect it, and making an optical film with a pressure-sensitive adhesive Can be manufactured.
- the release film used here is, for example, a film made of various resins such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyarylate, etc. It can be one that has undergone mold processing.
- the thickness of the pressure-sensitive adhesive layer is not particularly limited, it is usually preferably 30 ⁇ m or less, more preferably 10 ⁇ m or more, and further preferably 10 to 20 ⁇ m.
- the thickness of the pressure-sensitive adhesive layer is 30 ⁇ m or less, the adhesiveness under high temperature and high humidity is improved, and there is a tendency that the possibility of floating or peeling between the glass substrate and the pressure-sensitive adhesive layer is reduced. It is preferable because the reworkability tends to improve, and if the thickness is 10 ⁇ m or more, even if the dimension of the optical film bonded thereto changes, the adhesive layer follows the change in dimension and fluctuates.
- the thickness of the pressure-sensitive adhesive layer adhered to the liquid crystal cell glass has been 25 ⁇ m as standard, but in the present invention, even if the thickness is 20 ⁇ m or less, sufficient performance as the pressure-sensitive adhesive layer is exhibited. To do.
- the optical film with the pressure-sensitive adhesive of the present invention is attached to a glass substrate to form an optical laminate, and when there is some inconvenience and the optical film is peeled from the glass substrate, the pressure-sensitive adhesive layer is accompanied by the optical film. Since the surface of the glass substrate that has been peeled off and is in contact with the pressure-sensitive adhesive layer hardly causes fogging or adhesive residue, it is easy to re-attach the optical film with the pressure-sensitive adhesive again to the glass substrate after peeling. That is, it is excellent in so-called reworkability.
- optical laminate The optical film with pressure-sensitive adhesive of the present invention can be laminated on a glass substrate with the pressure-sensitive adhesive layer to form an optical laminate.
- the release film is peeled off from the optical film with an adhesive obtained as described above, and the exposed adhesive layer is removed from the surface of the glass substrate. You just have to stick together.
- a glass substrate the glass substrate of a liquid crystal cell, the glass for glare-proof, the glass for sunglasses etc. can be mentioned, for example.
- an optical film with an adhesive (upper polarizing plate) is laminated on the glass substrate on the front side (viewing side) of the liquid crystal cell, and another optical film with adhesive (lower polarizing plate) on the glass substrate on the back side of the liquid crystal cell.
- the optical laminated body formed by laminating is preferable because it can be used as a panel (liquid crystal panel) for a liquid crystal display device.
- the material for the glass substrate include soda lime glass, low alkali glass, and non-alkali glass.
- a polarizing plate 5 is configured by sticking a protective film 3 having a surface treatment layer 2 on one side of a linear polarizing film 1 on the surface opposite to the surface treatment layer 2.
- the polarizing plate 5 is also the optical film 10 referred to in the present invention.
- the pressure-sensitive adhesive layer 20 containing the ionic compound described above is provided on the surface of the linearly polarizing film 1 opposite to the protective film 3 to form an optical film 25 with a pressure-sensitive adhesive.
- the surface on the opposite side to the polarizing plate 5 of the adhesive layer 20 is bonded to the liquid crystal cell 30 which is a glass substrate, and the optical laminated body 40 is comprised.
- a first protective film 3 having a surface treatment layer 2 is attached to one side of a linear polarizing film 1 on the surface opposite to the surface treatment layer 2, and the linear polarizing film A polarizing plate 5 is configured by sticking a second protective film 4 to the other surface of 1. Also in this example, the polarizing plate 5 is simultaneously the optical film 10 referred to in the present invention.
- the pressure-sensitive adhesive layer 20 containing the ionic compound described above is provided, and the optical film 25 with pressure-sensitive adhesive is formed. And the surface on the opposite side to the polarizing plate 5 of the adhesive layer 20 is bonded to the liquid crystal cell 30 which is a glass substrate, and the optical laminated body 40 is comprised.
- a polarizing film 5 is configured by sticking a protective film 3 having a surface treatment layer 2 on one surface of a linearly polarizing film 1 on the surface opposite to the surface treatment layer 2.
- a retardation film 7 is stuck via an interlayer adhesive 8 to constitute an optical film 10.
- the pressure-sensitive adhesive layer 20 containing the ionic compound described above is provided, and the optical film 25 with pressure-sensitive adhesive is formed.
- the surface on the opposite side to the optical film 10 of the adhesive layer 20 is bonded to the liquid crystal cell 30 which is a glass substrate, and the optical laminated body 40 is comprised.
- the first protective film 3 having the surface treatment layer 2 is attached to one surface of the linearly polarizing film 1 on the surface opposite to the surface treatment layer 2 to form a straight line.
- a second protective film 4 is stuck to form a polarizing plate 5.
- a retardation film 7 is stuck via an interlayer adhesive 8 to constitute an optical film 10.
- the pressure-sensitive adhesive layer 20 containing the ionic compound described above is provided, and the optical film 25 with pressure-sensitive adhesive is formed.
- the surface on the opposite side to the optical film 10 of the adhesive layer 20 is bonded to the liquid crystal cell 30 which is a glass substrate, and the optical laminated body 40 is comprised.
- the first protective film 3 and the second protective film 4 are generally composed of a triacetyl cellulose film, but are composed of the various transparent resin films described above. You can also.
- the surface treatment layer formed on the surface of the first protective film 3 can be a hard coat layer, an antiglare layer, an antireflection layer, an antistatic layer, or the like. Of these, a plurality of layers may be provided.
- a quarter wave plate can be mentioned.
- the absorption axis of the polarizing plate 5 and the slow axis of the retardation film 7 which is a quarter wavelength plate are arranged so as to intersect at about 45 degrees. Depending on the characteristics, the angle may be shifted from 45 degrees to some extent.
- a retardation film having various retardation values in accordance with the characteristics of the liquid crystal cell 30 is used for the purpose of phase difference compensation and viewing angle compensation of the liquid crystal cell 30.
- the polarizing plate 5 and the retardation film 7 are generally arranged so that the absorption axis and the slow axis of the retardation film 7 are substantially orthogonal or substantially parallel.
- a uniaxial or biaxial stretched film is preferably used.
- the retardation film 7 is provided for the purpose of retardation compensation or viewing angle compensation of the liquid crystal cell 30, in addition to the uniaxial or biaxially stretched film, it is also oriented in the thickness direction in addition to the uniaxial or biaxially stretched film.
- an optical compensation film such as a film or a film obtained by coating and fixing a retardation-expressing substance such as liquid crystal on a support film, can also be used as the retardation film 7.
- the interlayer adhesive 8 includes An antistatic agent such as the ionic compound described above can be blended and an antistatic agent can be used. However, since there is usually not much antistatic property desired in this part, It is customary to use a general acrylic adhesive that does not contain an inhibitor. Further, as in the large liquid crystal display device described above, the polarizing axis 5 and the slow axis of the retardation film 7 are arranged so that the slow axis is substantially orthogonal or substantially parallel.
- an adhesive that, once bonded, can be firmly bonded and cannot be peeled off.
- an adhesive include an aqueous adhesive that is composed of an aqueous solution or an aqueous dispersion and exhibits adhesive strength by evaporating water as a solvent, and UV curing that is cured by UV irradiation and exhibits adhesive strength. Examples thereof include a mold adhesive.
- the pressure-sensitive adhesive layer 20 containing an ionic compound is formed on the retardation film 7 itself can be circulated by itself and is referred to in the present invention. It can be an optical film with an adhesive.
- An optical film with a pressure-sensitive adhesive in which a pressure-sensitive adhesive layer containing an ionic compound is formed on a retardation film can be bonded to a liquid crystal cell as a glass substrate to form an optical laminate, and the phase difference film.
- a polarizing plate can be bonded to the side to make another optical film with an adhesive.
- FIG. 1 shows an example in which the optical film 25 with an adhesive is arranged on the viewing side of the liquid crystal cell 30, but the optical film with an adhesive according to the present invention is the back side of the liquid crystal cell, that is, the back. It can also be placed on the light side.
- a protective film having no surface treatment layer is employed instead of the protective film 3 having the surface treatment layer 2 shown in FIG.
- Others can be configured similarly to (A) to (D) of FIG.
- various optical films known to be disposed on the back side of the liquid crystal cell such as a brightness enhancement film, a light collecting film, and a diffusion film, may be provided outside the protective film constituting the polarizing plate. Is possible.
- the optical layered body of the present invention can be suitably used for a liquid crystal display device.
- the liquid crystal display device formed from the optical laminate of the present invention includes, for example, a notebook type, a desktop type, a personal computer liquid crystal display including a PDA (Personal Digital Assistance), a television, an in-vehicle display, an electronic dictionary, and a digital camera. It can be used for digital video cameras, electronic desk calculators, watches, etc.
- PDA Personal Digital Assistance
- the nonvolatile content is a value measured by a method according to JIS K5407. Specifically, the adhesive solution was taken in a petri dish at an arbitrary weight, and the residual non-volatile content after drying for 2 hours at 115 ° C. in an explosion-proof oven was expressed as a percentage of the weight of the solution first measured. It is.
- the weight average molecular weight is measured in series on a GPC device with four “TSK gel XL” manufactured by Tosoh Corp. and one “GPC KF-802” manufactured by Shodex Corp. in series. Tetrahydrofuran was used as the eluent, and the sample concentration was 5 mg / mL, the sample introduction amount was 100 ⁇ L, the temperature was 40 ° C., and the flow rate was 1 mL / min.
- the obtained acrylic resin had a polystyrene-equivalent weight average molecular weight Mw of 1,750,000 and Mw / Mn of 4.9 by GPC.
- This is designated as acrylic resin A.
- the structural unit derived from 2-hydroxyethyl acrylate which is a hydroxyl group-containing monomer in the acrylic resin A is 1%, and the structural unit derived from acrylic acid which is a carboxyl group-containing monomer is 0.4%. It is.
- the structural unit derived from 2-hydroxyethyl acrylate which is a hydroxyl group-containing monomer in the acrylic resin B is 1%, and the structural unit derived from acrylic acid which is a carboxyl group-containing monomer is 0.4%. It is.
- the structural unit derived from 2-hydroxyethyl acrylate which is a hydroxyl group-containing monomer in the acrylic resin C is 1%, and the structural unit derived from acrylic acid which is a carboxyl group-containing monomer is 0.4%. It is.
- Polymerization Example 4 Of the monomer composition, the same procedure as in Polymerization Example 1 was conducted, except that the amount of butyl acrylate was changed to 93.6 parts, the amount of 2-methoxyethyl acrylate was changed to 5 parts, and the incubation time was changed to 18 hours. An ethyl acetate solution of an acrylic resin was obtained. The obtained acrylic resin had a polystyrene-equivalent weight average molecular weight Mw of 1,680,000 and Mw / Mn of 5.4 by GPC. This is designated as acrylic resin D.
- the structural unit derived from 2-hydroxyethyl acrylate which is a hydroxyl group-containing monomer in the acrylic resin D is 1%, and the structural unit derived from acrylic acid which is a carboxyl group-containing monomer is 0.4%. It is.
- Table 1 shows a list of monomer compositions, weight average molecular weights, and Mw / Mn of polymerization examples 1 to 5.
- BA means butyl acrylate
- MEA means 2-methoxyethyl acrylate
- HEA means 2-hydroxyethyl acrylate
- AA acrylic acid
- Examples and Comparative Examples in which an adhesive composition was prepared using the acrylic resin produced above and applied to an optical film are shown.
- the following ionic compounds 1 to 3 were used as ionic compounds.
- the following ionic compounds 1 and 2 are solid at room temperature of 25 ° C., and ionic compound 3 is liquid at room temperature of 25 ° C.
- Ionic compound 1 solid: N-octyl-4-methylpyridinium hexafluorophosphate (having the structure of the following formula, melting point: 44 ° C.)
- Ionic compound 2 solid: tributylmethylammonium bis (trifluoromethanesulfonyl) imide (having the structure of the following formula, melting point: 28 ° C.)
- Ionic compound 3 liquid: N-hexyl-4-methylpyridinium hexafluorophosphate (having the structure of the following formula, melting point: 18 ° C.)
- Coronate L Obtained from an ethyl acetate solution of trimethylolpropane adduct of tolylene diisocyanate (solid content concentration 75%), Nippon Polyurethane Co., Ltd.
- KBM-403 Glycidoxypropyltrimethoxysilane (liquid), obtained from Shin-Etsu Chemical Co., Ltd.
- a polarizing plate having a three-layer structure in which both sides of a polyvinyl alcohol polarizer to which iodine is adsorbed and oriented are sandwiched by protective films made of triacetyl cellulose the surface opposite to the separator of the sheet-like adhesive obtained above ( The pressure-sensitive adhesive surface) was pasted with a laminator and then cured for 7 days under conditions of a temperature of 23 ° C. and a relative humidity of 65% to obtain a polarizing plate with a pressure-sensitive adhesive.
- the cured polarizing plate with adhesive was stored in an oven at a temperature of 60 ° C. and a relative humidity of 70% for 6 days, and then the separator was peeled off in the same manner as above. Then, the surface resistance value of the adhesive was measured.
- storing for 6 days at a temperature of 60 ° C. and a relative humidity of 70% has almost the same effect as storing for 6 months at room temperature. The results are shown in Table 2.
- Examples 1 to 4 in which a predetermined amount of an ionic solid was blended with the acrylic resin defined in the present invention to constitute a pressure-sensitive adhesive composition were Comparative Examples 2 in which an ionic liquid was blended.
- the antistatic property is almost the same in the initial stage of manufacture, and the antistatic property is hardly changed even after a long period of time.
- the heat resistance, moist heat resistance and heat shock resistance are almost satisfactory. was gotten.
- Comparative Example 1 in which the acrylic resin does not contain a structural unit derived from the ether type (meth) acrylic ester of the formula (II) has good results for heat resistance, moist heat resistance and heat shock resistance. Although given, the initial antistatic performance was low.
- Comparative Example 2 comprising an N-hexyl-4-methylpyridinium hexafluorophosphate (ionic compound 3) that is liquid at 25 ° C. to form a pressure-sensitive adhesive composition exhibits good antistatic properties at the initial stage of production.
- ionic compound 3 N-hexyl-4-methylpyridinium hexafluorophosphate
- the optical film with a pressure-sensitive adhesive of the present invention is imparted with high antistatic property, and the antistatic property is maintained for a long period of time, and is excellent in durability.
- This optical film with an adhesive is suitably used for a liquid crystal display device.
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Abstract
Description
(A)(A-1)下式(I)
で示される(メタ)アクリル酸エステル55~94重量%、
(A-2)下式(II)
で示される(メタ)アクリル酸エステル(以下、「エーテル型(メタ)アクリル酸エステル」と呼ぶことがある)5~40重量%、および、
(A-3)極性官能基を有する不飽和単量体0.1~5重量%
を含む単量体混合物から得られる共重合体であるアクリル樹脂100重量部、
(B)有機カチオンを有し、室温において固体であるイオン性化合物0.3~12重量部、並びに
(C)架橋剤0.1~5重量部。
さらに、有機カチオンを有し、室温において固体であるイオン性化合物を粘着剤組成物中に含有することにより、製作してから長時間保管しても、初期の帯電防止性能を保持することが可能である。
(A)アクリル樹脂、
(B)有機カチオンを有し、室温において固体であるイオン性化合物、および、
(C)架橋剤
を含有する組成物から形成される。まず、粘着剤組成物を構成する各成分について説明する。
本発明の粘着剤付き光学フィルムにおいて、粘着剤層に用いられるアクリル樹脂(A)は、前記式(I)で示される(メタ)アクリル酸エステルに由来する構造単位を主成分とするものであるが、具体的には、かかる(メタ)アクリル酸エステルに由来する構造単位に加え、前記式(II)で示されるエーテル型(メタ)アクリル酸エステルに由来する構造単位、遊離カルボキシル基、水酸基、アミノ基、エポキシ環をはじめとする複素環基などの極性官能基を有する単量体、好ましくは極性官能基を有する(メタ)アクリル酸系化合物に由来する構造単位を含むものである。ここで、(メタ)アクリル酸とは、アクリル酸またはメタクリル酸のいずれでもよいことを意味し、他に、(メタ)アクリレートなどというときの「(メタ)」も同様の趣旨である。
本発明では、以上のようなアクリル樹脂(A)に加え、帯電防止剤として、室温(25℃)において固体であるイオン性化合物(B)を用いる。このイオン性化合物(B)は、有機カチオンを有している。かかる室温において固体であるイオン性化合物を、本明細書においては、イオン性固体と呼ぶこともある。
ブロマイドアニオン〔Br-〕、
ヨーダイドアニオン〔I-〕、
テトラクロロアルミネートアニオン〔AlCl4 -〕、
ヘプタクロロジアルミネートアニオン〔Al2Cl7 -〕、
テトラフルオロボレートアニオン〔BF4 -〕、
ヘキサフルオロホスフェートアニオン〔PF6 -〕、
パークロレートアニオン〔ClO4 -〕、
ナイトレートアニオン〔NO3 -〕、
アセテートアニオン〔CH3COO-〕、
トリフルオロアセテートアニオン〔CF3COO-〕、
メタンスルホネートアニオン〔CH3SO3 -〕、
トリフルオロメタンスルホネートアニオン〔CF3SO3 -〕、
p-トルエンスルホネートアニオン〔p-CH3C6H4SO3 -〕、
ビス(トリフルオロメタンスルホニル)イミドアニオン〔(CF3SO2)2N-〕、
トリス(トリフルオロメタンスルホニル)メタニドアニオン〔(CF3SO2)3C-〕、 ヘキサフルオロアーセネートアニオン〔AsF6 -〕、
ヘキサフルオロアンチモネートアニオン〔SbF6 -〕、
ヘキサフルオロニオベートアニオン〔NbF6 -〕、
ヘキサフルオロタンタレートアニオン〔TaF6 -〕、
ジメチルホスフィネートアニオン〔(CH3)2POO-〕、
(ポリ)ハイドロフルオロフルオライドアニオン〔F(HF)n -〕(nは1~3程度)、 ジシアナミドアニオン〔(CN)2N-〕、
チオシアンアニオン〔SCN-〕、
パーフルオロブタンスルホネートアニオン〔C4F9SO3 -〕、
ビス(ペンタフルオロエタンスルホニル)イミドアニオン〔(C2F5SO2)2N-〕、 パーフルオロブタノエートアニオン〔C3F7COO-〕、
(トリフルオロメタンスルホニル)(トリフルオロメタンカルボニル)イミドアニオン〔(CF3SO2)(CF3CO)N-〕など。
N-オクチルピリジニウム ヘキサフルオロホスフェート、
N-ブチル-4-メチルピリジニウム ヘキサフルオロホスフェート、
N-オクチル-4-メチルピリジニウム ヘキサフルオロホスフェート、
N-ブチル-N-メチルピロリジニウム ヘキサフルオロホスフェート、
1-エチル-3-メチルイミダゾリウム ヘキサフルオロホスフェート、
1-エチル-3-メチルイミダゾリウム p-トルエンスルホネート、
1-ブチル-3-メチルイミダゾリウム メタンスルホネート、
テトラブチルアンモニウム ヘキサフルオロホスフェート、
テトラブチルアンモニウム p-トルエンスルホネート、
トリブチルメチルアンモニウム ビス(トリフルオロメタンスルホニル)イミド、
(2-ヒドロキシエチル)トリメチルアンモニウム ジメチルホスフィネートなど。
以上のようなアクリル樹脂(A)およびイオン性化合物(B)に、さらに架橋剤(C)を配合して、粘着剤組成物とする。架橋剤(C)は、アクリル樹脂(A)中の特に極性官能基を有する不飽和単量体(A-3)に由来する構造単位と架橋し得る官能基を分子内に少なくとも2個有する化合物であり、具体的には、イソシアネート系化合物、エポキシ系化合物、金属キレート系化合物、アジリジン系化合物などが例示される。
本発明における粘着剤層を形成するための粘着剤組成物には、粘着剤層とガラス基板との密着性を向上させるために、シラン系化合物(D)を含有させることが好ましく、とりわけ、架橋剤を配合する前のアクリル樹脂にシラン系化合物(D)を含有させておくことが好ましい。
3-メルカプトプロピルトリメトキシシラン-テトラエトキシシランコポリマー、
3-メルカプトプロピルトリエトキシシラン-テトラメトキシシランコポリマー、
3-メルカプトプロピルトリエトキシシラン-テトラエトキシシランコポリマー
の如き、メルカプトプロピル基含有のコポリマー;
メルカプトメチルトリメトキシシラン-テトラメトキシシランコポリマー、
メルカプトメチルトリメトキシシラン-テトラエトキシシランコポリマー、
メルカプトメチルトリエトキシシラン-テトラメトキシシランコポリマー、
メルカプトメチルトリエトキシシラン-テトラエトキシシランコポリマー
の如き、メルカプトメチル基含有のコポリマー;
3-メタクリロイルオキシプロピルトリメトキシシラン-テトラメトキシシランコポリマー、
3-メタクリロイルオキシプロピルトリメトキシシラン-テトラエトキシシランコポリマー、
3-メタクリロイルオキシプロピルトリエトキシシラン-テトラメトキシシランコポリマー、
3-メタクリロイルオキシプロピルトリエトキシシラン-テトラエトキシシランコポリマー、
3-メタクリロイルオキシプロピルメチルジメトキシシラン-テトラメトキシシランコポリマー、
3-メタクリロイルオキシプロピルメチルジメトキシシラン-テトラエトキシシランコポリマー、
3-メタクリロイルオキシプロピルメチルジエトキシシラン-テトラメトキシシランコポリマー、
3-メタクリロキシイルオプロピルメチルジエトキシシラン-テトラエトキシシランコポリマー
の如き、メタクリロイルオキシプロピル基含有のコポリマー;
3-アクリロイルオキシプロピルトリメトキシシラン-テトラメトキシシランコポリマー、
3-アクリロイルオキシプロピルトリメトキシシラン-テトラエトキシシランコポリマー、
3-アクリロイルオキシプロピルトリエトキシシラン-テトラメトキシシランコポリマー、
3-アクリロイルオキシプロピルトリエトキシシラン-テトラエトキシシランコポリマー、
3-アクリロイルオキシプロピルメチルジメトキシシラン-テトラメトキシシランコポリマー、
3-アクリロイルオキシプロピルメチルジメトキシシラン-テトラエトキシシランコポリマー、
3-アクリロイルオキシプロピルメチルジエトキシシラン-テトラメトキシシランコポリマー、
3-アクリロイルオキシプロピルメチルジエトキシシラン-テトラエトキシシランコポリマー
の如き、アクリロイルオキシプロピル基含有のコポリマー;
ビニルトリメトキシシラン-テトラメトキシシランコポリマー、
ビニルトリメトキシシラン-テトラエトキシシランコポリマー、
ビニルトリエトキシシラン-テトラメトキシシランコポリマー、
ビニルトリエトキシシラン-テトラエトキシシランコポリマー、
ビニルメチルジメトキシシラン-テトラメトキシシランコポリマー、
ビニルメチルジメトキシシラン-テトラエトキシシランコポリマー、
ビニルメチルジエトキシシラン-テトラメトキシシランコポリマー、
ビニルメチルジエトキシシラン-テトラエトキシシランコポリマー
の如き、ビニル基含有のコポリマー;
3-アミノプロピルトリメトキシシラン-テトラメトキシシランコポリマー、
3-アミノプロピルトリメトキシシラン-テトラエトキシシランコポリマー、
3-アミノプロピルトリエトキシシラン-テトラメトキシシランコポリマー、
3-アミノプロピルトリエトキシシラン-テトラエトキシシランコポリマー、
3-アミノプロピルメチルジメトキシシラン-テトラメトキシシランコポリマー、
3-アミノプロピルメチルジメトキシシラン-テトラエトキシシランコポリマー、
3-アミノプロピルメチルジエトキシシラン-テトラメトキシシランコポリマー、
3-アミノプロピルメチルジエトキシシラン-テトラエトキシシランコポリマー
の如き、アミノ基含有のコポリマーなど。
本発明の粘着剤付き光学フィルムは、光学フィルムの少なくとも一方の面に、以上のような粘着剤組成物から形成される粘着剤層を設けたものである。ここで用いる光学フィルムとは、光学特性を有するフィルムであり、例えば、偏光板、位相差フィルムなどが挙げられる。
本発明の粘着剤付き光学フィルムは、その粘着剤層でガラス基板に積層して、光学積層体とすることができる。粘着剤付き光学フィルムをガラス基板に積層して光学積層体とするには、例えば、上記のようにして得られる粘着剤付き光学フィルムから剥離フィルムを剥がし、露出した粘着剤層をガラス基板の表面に貼り合わせればよい。ここで、ガラス基板としては、例えば、液晶セルのガラス基板、防眩用ガラス、サングラス用ガラスなどを挙げることができる。中でも、液晶セルの前面側(視認側)のガラス基板に粘着剤付き光学フィルム(上偏光板)を積層し、液晶セルの背面側のガラス基板に別の粘着剤付き光学フィルム(下偏光板)を積層してなる光学積層体は、液晶表示装置のためのパネル(液晶パネル)として使用し得ることから好ましい。ガラス基板の材料としては、例えば、ソーダライムガラス、低アルカリガラス、無アルカリガラスなどが挙げられる。
冷却管、窒素導入管、温度計および攪拌機を備えた反応容器に、酢酸エチル81.8部、(A-1)としてアクリル酸ブチル88.6部、(A-2)としてアクリル酸2-メトキシエチル10部、(A-3)としてアクリル酸2-ヒドロキシエチル1.0部、およびアクリル酸0.4部の混合溶液を仕込み、窒素ガスで装置内の空気を置換して酸素不含としながら、内温を55℃に上げた。その後、アゾビスイソブチロニトリル(重合開始剤)0.14部を酢酸エチル10部に溶かした溶液を全量添加した。開始剤添加1時間後に、単量体を除くアクリル樹脂の濃度が35%になるよう、添加速度17.3部/hrで酢酸エチルを連続的に反応容器内へ加えながら、内温54~56℃で12時間保温し、最後に酢酸エチルを加えて、アクリル樹脂の濃度が20%となるように調節した。得られたアクリル樹脂は、GPCによるポリスチレン換算の重量平均分子量Mwが1,750,000、Mw/Mnが4.9であった。これをアクリル樹脂Aとする。アクリル樹脂A中の水酸基含有単量体であるアクリル酸2-ヒドロキシエチルに由来する構造単位は1%であり、またカルボキシル基含有単量体であるアクリル酸に由来する構造単位は0.4%である。
単量体組成のうち、アクリル酸ブチルの量を78.6部、アクリル酸2-メトキシエチルの量を20部に変更した以外は、重合例1と同様にしてアクリル樹脂の酢酸エチル溶液を得た。得られたアクリル樹脂は、GPCによるポリスチレン換算の重量平均分子量Mwが1,660,000、Mw/Mnが4.4であった。これをアクリル樹脂Bとする。アクリル樹脂B中の水酸基含有単量体であるアクリル酸2-ヒドロキシエチルに由来する構造単位は1%であり、またカルボキシル基含有単量体であるアクリル酸に由来する構造単位は0.4%である。
単量体組成のうち、アクリル酸ブチルの量を58.6部、アクリル酸2-メトキシエチルの量を40部に変更した以外は、重合例1と同様にしてアクリル樹脂の酢酸エチル溶液を得た。得られたアクリル樹脂は、GPCによるポリスチレン換算の重量平均分子量Mwが1,580,000、Mw/Mnが4.8であった。これをアクリル樹脂Cとする。アクリル樹脂C中の水酸基含有単量体であるアクリル酸2-ヒドロキシエチルに由来する構造単位は1%であり、またカルボキシル基含有単量体であるアクリル酸に由来する構造単位は0.4%である。
単量体組成のうち、アクリル酸ブチルの量を93.6部、アクリル酸2-メトキシエチルの量を5部に変更し、保温時間を18時間にした以外は、重合例1と同様にしてアクリル樹脂の酢酸エチル溶液を得た。得られたアクリル樹脂は、GPCによるポリスチレン換算の重量平均分子量Mwが1,680,000、Mw/Mnが5.4であった。これをアクリル樹脂Dとする。アクリル樹脂D中の水酸基含有単量体であるアクリル酸2-ヒドロキシエチルに由来する構造単位は1%であり、またカルボキシル基含有単量体であるアクリル酸に由来する構造単位は0.4%である。
単量体組成のうちアクリル酸ブチルの量を98.6部とし、アクリル酸2-メトキシエチルを用いなかったこと以外は、重合例1と同様にしてアクリル樹脂の酢酸エチル溶液を得た。得られたアクリル樹脂は、GPCによるポリスチレン換算の重量平均分子量Mwが1,470,000、Mw/Mnが4.4であった。これをアクリル樹脂Eとする。アクリル樹脂E中の水酸基含有単量体であるアクリル酸2-ヒドロキシエチルに由来する構造単位は1%であり、またカルボキシル基含有単量体であるアクリル酸に由来する構造単位は0.4%である。
コロネートL: トリレンジイソシアネートのトリメチロールプロパンアダクト体の酢酸エチル溶液(固形分濃度75%)、日本ポリウレタン(株)から入手。
KBM-403: グリシドキシプロピルトリメトキシシラン(液体)、信越化学工業(株)から入手。
(a)粘着剤組成物の製造
重合例1~5で得たアクリル樹脂A~Eの固形分それぞれ100部に対し、表2に示すイオン性化合物をそれぞれ3部、架橋剤“コロネートL”を固形分で0.5部、およびシラン系化合物“KBM-403”を0.5部混合し、さらに固形分濃度が13%となるように酢酸エチルを添加して、粘着剤組成物とした。表2のイオン性化合物の欄には、上述したイオン性化合物1~3の番号と、それが室温において固体であるか液体であるかを示した。
上の各粘着剤組成物を、離型処理されたポリエチレンテレフタレートフィルム(商品名“PET 3811”、リンテック(株)から入手、セパレーターと呼ぶ)の離型処理面に、アプリケーターを用いて乾燥後の厚さが20μmとなるように塗布し、90℃で1分間乾燥させ、シート状の粘着剤を得た。次いで、ヨウ素が吸着配向したポリビニルアルコール偏光子の両面をトリアセチルセルロースからなる保護フィルムで挟んだ3層構造の偏光板の片面に、上で得たシート状粘着剤のセパレーターと反対側の面(粘着剤面)をラミネーターにより貼り合わせたのち、温度23℃、相対湿度65%の条件で7日間養生して、粘着剤付き偏光板を得た。
得られた粘着剤付き偏光板のセパレーターを剥離したときに、粘着剤の表面抵抗値を表面固有抵抗測定装置〔三菱化学(株)製の“Hirest-up MCP-HT450”(商品名)〕にて測定し、帯電防止性を評価した。IPSモードでは表面抵抗値が1010Ω/□オーダーまたはそれ以下が必要とされ、長期にわたり、その帯電防止性能が保持されることも求められる。帯電防止性の評価は、粘着剤付き偏光板の養生が完了した後、直ちに行った。また、長期間保存するときの経時変化をみるために、養生が完了した粘着剤付き偏光板を、温度60℃、相対湿度70%のオーブンに6日間保管した後、上記と同様にセパレーターを剥離し、粘着剤の表面抵抗値を測定した。ここで、温度60℃、相対湿度70%で6日間保管することは、室温で6ヶ月間保管することとほぼ同等な効果が得られる。結果を表2に示す。
上記(b)で作製した粘着剤付き偏光板からセパレーターを剥がした後、その粘着剤面を液晶セル用ガラス基板〔コーニング社製の“1737”(商品名)〕の片面に貼着して、光学積層体を作製した。この光学積層体につき、温度80℃の乾燥条件下で300時間保管する耐熱試験を行った場合(表2では「耐熱」と表記)と、温度60℃、相対湿度90%で300時間保管する耐湿熱試験を行った場合(表2では「耐湿熱」と表記)と、70℃に加熱した状態から-30℃に降温し、次いで70℃に昇温する過程を1サイクル(1時間)として、これを100サイクル繰り返す耐ヒートショック試験を行った場合(表2では「耐HS」と表記)のそれぞれについて、試験後の光学積層体を目視で観察した。結果を以下の基準で分類し、表2にまとめた。
1:浮き、剥れ、発泡等の外観変化が全くみられない。
2:浮き、剥れ、発泡等の外観変化がほとんどみられない。
3:浮き、剥れ、発泡等の外観変化がやや目立つ。
4:浮き、剥れ、発泡等の外観変化が顕著に認められる。
リワーク性の評価は次のように行った。まず、前記(b)で得られた粘着剤付き偏光板を25mm×150mmの大きさの試験片に裁断した。次に、この試験片をその粘着剤側で、貼付装置〔フジプラ(株)製の“ラミパッカー”(商品名)〕を用いて液晶セル用ガラス基板に貼り付け、50℃、5kg/cm2(490.3kPa)で20分間オートクレーブ処理を行った。次に70℃で2時間加熱処理し、引き続き50℃のオーブン中にて48時間保管した後、温度23℃、相対湿度50%の雰囲気中にて、この貼着試験片から偏光板を300mm/分の速度で180°方向に剥離し、ガラス板表面の状態を観察して、以下の基準で分類した。結果を、併せて表2に示した。
1:ガラス板表面に曇り等が全く認められない。
2:ガラス板表面に曇り等がほとんど認められない。
3:ガラス板表面に曇り等が認められる。
4:ガラス板表面に粘着剤の残りが認められる。
Claims (8)
- 光学フィルムの少なくとも片面に粘着剤層が形成されてなる粘着剤付き光学フィルムであって、該粘着剤層は、
(A)(A-1)下式(I)
で示される(メタ)アクリル酸エステル55~94重量%、
(A-2)下式(II)
で示される(メタ)アクリル酸エステル5~40重量%、および、
(A-3)極性官能基を有する不飽和単量体0.1~5重量%
を含む単量体混合物から得られる共重合体であるアクリル樹脂100重量部、
(B)有機カチオンを有し、室温において固体であるイオン性化合物0.3~12重量部、並びに
(C)架橋剤0.1~5重量部
を含有する粘着剤組成物から形成されていることを特徴とする粘着剤付き光学フィルム。 - 前記式(II)で示される(メタ)アクリル酸エステルがアクリル酸2-メトキシエチルである請求の範囲1に記載の粘着剤付き光学フィルム。
- 前記極性官能基を有する不飽和単量体(A-3)の極性官能基が、遊離カルボキシル基、水酸基、アミノ基およびエポキシ環からなる群より選ばれる請求の範囲1に記載の粘着剤付光学フィルム
- 前記架橋剤(C)はイソシアネート系化合物を含有する請求の範囲3に記載の粘着剤付光学フィルム。
- 前記粘着剤組成物はさらに、(D)シラン系化合物0.03~1重量部を含有する請求の範囲1に記載の粘着剤付き光学フィルム。
- 前記光学フィルムは、偏光板および位相差フィルムから選ばれる請求の範囲1に記載の粘着剤付き光学フィルム。
- 粘着剤層の表面に剥離フィルムが貼着されている請求の範囲1に記載の粘着剤付き光学フィルム。
- 請求の範囲1に記載の粘着剤付き光学フィルムが、その粘着剤層側でガラス基板に積層されてなることを特徴とする光学積層体。
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Also Published As
Publication number | Publication date |
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CN102119348A (zh) | 2011-07-06 |
CN102119348B (zh) | 2014-12-31 |
JP2010066756A (ja) | 2010-03-25 |
KR101597851B1 (ko) | 2016-02-25 |
KR20110045012A (ko) | 2011-05-03 |
TW201018718A (en) | 2010-05-16 |
TWI449766B (zh) | 2014-08-21 |
JP5354674B2 (ja) | 2013-11-27 |
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