WO2012161251A1 - 粘着剤層付偏光板及び画像表示装置 - Google Patents
粘着剤層付偏光板及び画像表示装置 Download PDFInfo
- Publication number
- WO2012161251A1 WO2012161251A1 PCT/JP2012/063305 JP2012063305W WO2012161251A1 WO 2012161251 A1 WO2012161251 A1 WO 2012161251A1 JP 2012063305 W JP2012063305 W JP 2012063305W WO 2012161251 A1 WO2012161251 A1 WO 2012161251A1
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- WIPO (PCT)
- Prior art keywords
- sensitive adhesive
- pressure
- adhesive layer
- meth
- acid
- Prior art date
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- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- RKYSDIOEHLMYRS-UHFFFAOYSA-N triethoxy(hex-5-enyl)silane Chemical compound CCO[Si](OCC)(OCC)CCCCC=C RKYSDIOEHLMYRS-UHFFFAOYSA-N 0.000 description 1
- WEAPVABOECTMGR-UHFFFAOYSA-N triethyl 2-acetyloxypropane-1,2,3-tricarboxylate Chemical compound CCOC(=O)CC(C(=O)OCC)(OC(C)=O)CC(=O)OCC WEAPVABOECTMGR-UHFFFAOYSA-N 0.000 description 1
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 description 1
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 description 1
- 125000006617 triphenylamine group Chemical group 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 229960001939 zinc chloride Drugs 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- 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
- G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—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 comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
-
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
Definitions
- the present invention relates to a polarizing plate with an adhesive layer and an image display device.
- the present invention relates to a polarizing plate with an adhesive layer and an image display device that are excellent in reliability of optical properties such as polarization degree and adhesion durability.
- a polarizing plate is made of a polyvinyl alcohol film and a transparent protective film for a polarizing film using triacetyl cellulose or the like on one or both sides of a polarizing film made of a dichroic material such as a polyvinyl alcohol film and iodine. What was bonded together with the agent is used.
- an adhesive is usually used.
- the polarizing film can be instantly fixed to the liquid crystal cell or the like, and since a drying process is not required to fix the polarizing film to the liquid crystal cell or the like, the adhesive is previously applied to one side of the polarizing film. It is often provided as an adhesive layer. That is, a polarizing plate with an adhesive layer is generally used for attaching the polarizing plate.
- the properties required for the pressure-sensitive adhesive layer are that the adhesiveness does not deteriorate over time and has high durability, and when the polarizing film is bonded to the liquid crystal cell, the bonding position is incorrect, or foreign matter is present on the bonding surface.
- the polarizing film can be peeled off from the surface of the liquid crystal panel and pasted (reworked) again.
- image display devices for mobile applications such as mobile phones have a tendency to make the entire module thinner and lighter, particularly from the viewpoint of design and portability.
- optical films such as polarizing plates used in image display devices.
- usage environments such as outdoor use in harsh environments are diversifying, and durability is required more than ever. Under such circumstances, there is a demand for a thin polarizing film having excellent optical characteristics, and it is also necessary to develop a pressure-sensitive adhesive layer applicable to such a thin polarizing film.
- Patent Document 1 discloses a polarizing film having a pressure-sensitive adhesive layer provided on one side of a polarizing film having good durability even in a high temperature environment.
- a polarizing plate is disclosed in which a protective layer made of a transparent resin film is provided on the other surface of the polarizing film.
- Patent Document 2 Japanese Unexamined Patent Application Publication No. 2009-251177 (Patent Document 2) is an adhesive polarizing plate having a transparent protective film only on one side of a polarizing film and an adhesive layer on the other side.
- the transparent protective film has an adhesive layer only on one side of the polarizing film for the purpose of providing an adhesive-type polarizing plate that can satisfy the adhesive properties as a plate and can be easily reworked without causing breakage.
- An adhesive polarizing plate is disclosed in which a curable adhesive layer is provided on the other surface of the polarizing film.
- the pressure-sensitive adhesive layer is in direct contact with the polarizing film, so that the performance of the polarizing film such as optical characteristics is deteriorated. It has been found that a new problem arises that becomes prominent. It has also been found that this problem becomes more prominent when the polarizing film itself is thinned. Further, it has been found that when the thickness is reduced, there is a problem that the reworkability is deteriorated. Specifically, if the polarizing film itself is thinned, the thickness of the entire optical film will be reduced, making it difficult to pick up the end of the polarizing plate during rework, and problems such as the polarizing film being easily broken.
- An object of the present invention is to obtain a polarizing plate with a pressure-sensitive adhesive layer directly provided on a polarizing film and having excellent optical property reliability, adhesive durability, and reworkability.
- the present inventors have determined that the acid component in the monomer component of the pressure-sensitive adhesive polymer included in the pressure-sensitive adhesive composition is a polarizing film. Focusing on the effect on performance, the present invention has been completed.
- the relationship between the ratio of the acid component in the monomer component and the performance of the polarizing film such as reliability of optical properties and adhesive durability It was not done at all from the point of view.
- the inventors set the amount of the acid component in the total monomer component of the pressure-sensitive adhesive polymer, which is required to obtain a polarizing film with a pressure-sensitive adhesive layer having excellent properties, particularly a thin polarizing film.
- the pressure-sensitive adhesive layer is directly provided on at least one surface of the polarizing film, and the pressure-sensitive adhesive layer comprises a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive polymer.
- the amount of the acid component in all monomer components constituting the polymer is less than 8% by weight.
- the fact that the pressure-sensitive adhesive layer is provided “directly” on the surface of the polarizing film means that no layer is interposed between the polarizing film and the pressure-sensitive adhesive layer, as long as the effect of the present invention is not impaired.
- another layer such as an anchor layer exists between the polarizing film and the pressure-sensitive adhesive layer is also included.
- the thickness of the polarizing film is 10 ⁇ m or less.
- the thickness of the polarizing film can be 7 ⁇ m or less.
- the amount of the acid component is 0 to 6% by weight.
- the pressure-sensitive adhesive polymer can be substantially free of an acid component.
- the pressure-sensitive adhesive layer may be provided only on one side of the polarizing film.
- the thickness of the pressure-sensitive adhesive layer can be 1 to 35 ⁇ m.
- the pressure-sensitive adhesive polymer is an acrylic polymer or a methacrylic polymer.
- the acid component is selected from the group consisting of a carboxyl group-containing monomer, a phosphate group-containing monomer, and a sulfonic acid group-containing monomer.
- the present invention further relates to an image display device using at least one polarizing plate with an adhesive layer as described above.
- the pressure-sensitive adhesive composition will be described.
- the pressure-sensitive adhesive polymer is not particularly limited as long as it is a polymer having adhesiveness, which is generally used as a base polymer for pressure-sensitive adhesives.
- Tg is 0 ° C. or less (usually ⁇ 100 for normal reasons) C. or higher) is preferred.
- polyester polymers, (meth) acrylic polymers, and the like are preferably used.
- polyester polymer a saturated polyester or copolyester of a polyhydric alcohol and a polycarboxylic acid is usually used.
- polyhydric alcohol examples include ethylene glycol, propylene glycol, hexamethylene glycol, neopentyl glycol, 1,2-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, decamethylene glycol, 1,3-propanediol, , 4-butanediol, 1,5-pentanediol, 1,6-hexadiol, 2,2-bis (4-hydroxyphenyl) propane, bis (4-hydroxyphenyl) sulfone and the like.
- polyvalent carboxylic acid examples include terephthalic acid, isophthalic acid, orthophthalic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, Aromatic dicarboxylic acids such as diphenylcarboxylic acid, diphenoxyethanedicarboxylic acid, diphenylsulfonecarboxylic acid, anthracenedicarboxylic acid; 1,3-cyclopentanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, Alicyclic dicarboxylic acids such as hexahydroterephthalic acid and hexahydroisophthalic acid; malonic acid, dimethylmalonic acid, succinic acid, 3,3-diethylsuccinic acid, glutaric acid
- the amount of these acid components in the total monomer component constituting the pressure-sensitive adhesive polymer is less than 8% by weight, more preferably 0 to 6% by weight, more preferably 0 to 4% by weight, and further preferably 0 to 2% by weight. preferable.
- the adhesive polymer is substantially free of acid components.
- substantially free means not actively blending unless it is inevitably mixed. Specifically, 0.05 wt% based on the amount of all monomer components. Less than, preferably less than 0.01% by weight, more preferably less than 0.001% by weight.
- polyester polymer polyols such as polycarbonate diol can be used as the polyhydric alcohol.
- the polyester polymer can be obtained from the diol component and a trihydric or higher polyhydric alcohol and / or a trivalent or higher polyvalent carboxylic acid.
- the weight average molecular weight of the polyester polymer is usually 11,000 or more.
- the (meth) acrylic polymer usually contains an alkyl (meth) acrylate as a main component as a monomer unit.
- (meth) acrylate means an acrylate and / or a methacrylate.
- alkyl (meth) acrylate constituting the main skeleton of the (meth) acrylic polymer examples include linear or branched alkyl groups having 1 to 18 carbon atoms.
- the alkyl group includes methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, amyl group, hexyl group, cyclohexyl group, heptyl group, 2-ethylhexyl group, isooctyl group, nonyl group, decyl group.
- alkyl groups preferably have an average carbon number of 3 to 9.
- alkyl (meth) acrylates containing an aromatic ring such as phenoxyethyl (meth) acrylate and benzyl (meth) acrylate can be used.
- the alkyl (meth) acrylate containing an aromatic ring can be used by mixing a polymer obtained by polymerizing it with the (meth) acrylic polymer exemplified above, but from the viewpoint of transparency, it contains an aromatic ring.
- the alkyl (meth) acrylate is preferably copolymerized with the alkyl (meth) acrylate.
- (meth) acrylic polymer one or more having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group for the purpose of improving adhesiveness and heat resistance
- a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group for the purpose of improving adhesiveness and heat resistance
- copolymerized monomers include, for example, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, (meth) acrylic acid 6 Hydroxyl-containing monomers such as hydroxyhexyl, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate and (4-hydroxymethylcyclohexyl) -methyl acrylate Carboxyl group-containing monomers such as (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid and crotonic acid; acid anhydrides such as maleic anhydride and itaconic anhydride Monomer-containing monomer; Caprolac of acrylic acid Adducts such as styrene sulfonic acid
- examples of the acid component in the present invention include copolymer monomers having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group.
- Specific examples of the copolymerization monomer that is an acid component include, for example, acrylic acid, (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and the like.
- Carboxyl group-containing monomers maleic anhydride, itaconic anhydride and other acid anhydride group-containing monomers; acrylic acid caprolactone adducts; styrene sulfonic acid, allyl sulfonic acid, 2- (meth) acrylamide-2-methylpropane sulfonic acid Sulfonic acid group-containing monomers such as (meth) acrylamide propane sulfonic acid, sulfopropyl (meth) acrylate, (meth) acryloyloxynaphthalene sulfonic acid; and phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate It is.
- the acid is a relatively weak acid system such as a carboxyl group-containing monomer, and then a phosphate group-containing monomer and a sulfonic acid group-containing acid are included.
- a monomer etc. may be sufficient.
- the amount of these acid components in the total monomer component constituting the pressure-sensitive adhesive polymer is less than 8% by weight, more preferably 0 to 6% by weight, more preferably 0 to 4% by weight, and further preferably 0 to 2% by weight. Preferably, it is most preferable not to contain substantially.
- substantially free means not actively blending unless it is inevitably mixed. Specifically, 0.05 wt% based on the amount of all monomer components. Less than, preferably less than 0.01% by weight, more preferably less than 0.001% by weight.
- Monomers used for modification purposes include (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methylolpropane (meth) acrylamide, etc.
- alkylamino (meth) acrylates such as aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, and t-butylaminoethyl (meth) acrylate Alkyl monomers; (meth) acrylic acid alkoxyalkyl monomers such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate; N- (meth) acryloyloxymethylene succinimide and N- (meth) acryloyl-6- Oxyhexamethylene succini Succinimide monomers such as N- (meth) acryloyl-8-oxyoctamethylene succinimide and N-acryloylmorpholine; maleimide monomers such as N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmale
- Further modifying monomers include vinyl acetate, vinyl propionate, N-vinyl pyrrolidone, methyl vinyl pyrrolidone, vinyl pyridine, vinyl piperidone, vinyl pyrimidine, vinyl piperazine, vinyl pyrazine, vinyl pyrrole, vinyl imidazole, vinyl oxazole, vinyl morpholine, N- Vinyl monomers such as vinylcarboxylic amides, styrene, ⁇ -methylstyrene, N-vinylcaprolactam; cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing acrylic monomers such as glycidyl (meth) acrylate; (Meth) acrylic acid polyethylene glycol, (meth) acrylic acid polypropylene glycol, (meth) acrylic acid methoxyethylene glycol, (meth) acrylic acid meso Glycol acrylic ester monomers such as xypolypropylene glycol; acrylic ester monomers such as
- examples of copolymerizable monomers other than the above include silane-based monomers containing silicon atoms.
- examples of the silane monomer include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, and 8-vinyloctyltrimethoxysilane.
- copolymer monomers examples include tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate, neo Pentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate (Meth) acryloyl such as esterified product of (meth) acrylic acid and polyhydric alcohol such as caprolactone-modified dipentaerythritol hexa (meth) acrylate A polyfunctional monomer having
- a hydroxyl group-containing monomer and a carboxyl group-containing monomer are preferably used from the viewpoint of adhesiveness and durability.
- a hydroxyl group-containing monomer and a carboxyl group-containing monomer can be used in combination.
- These copolymerization monomers serve as reaction points with the crosslinking agent when the pressure-sensitive adhesive composition contains a crosslinking agent. Since a hydroxyl group-containing monomer, a carboxyl group-containing monomer, and the like are rich in reactivity with an intermolecular crosslinking agent, they are preferably used for improving the cohesiveness and heat resistance of the resulting pressure-sensitive adhesive layer.
- a hydroxyl group-containing monomer is preferable from the viewpoint of reworkability, and a carboxyl group-containing monomer is preferable from the viewpoint of achieving both durability and reworkability.
- the hydroxyl group-containing monomer is in an amount of about 0.01 to 30% by weight, preferably about 0.03 to 20% by weight, more preferably about 0.05 to 10% by weight, based on the total monomer components constituting the pressure-sensitive adhesive polymer. used.
- the copolymerization monomer other than the acid component is about 0 to 30% by weight, preferably about 0.1 to 20%, more preferably about 0.1 to 10%, based on the total monomer components constituting the pressure-sensitive adhesive polymer. Used in quantity.
- the production of such a (meth) acrylic polymer can be appropriately selected from known production methods such as solution polymerization, bulk polymerization, emulsion polymerization, and various radical polymerizations. Further, the (meth) acrylic polymer obtained may be any of a random copolymer, a block copolymer, a graft copolymer, and the like.
- solution polymerization for example, ethyl acetate, toluene or the like is used as a polymerization solvent.
- the reaction is carried out under an inert gas stream such as nitrogen and a polymerization initiator is added, usually at about 50 to 70 ° C. under reaction conditions for about 5 to 30 hours.
- the polymerization initiator, chain transfer agent, emulsifier and the like used for radical polymerization are not particularly limited and can be appropriately selected and used.
- the weight average molecular weight of a (meth) acrylic-type polymer can be controlled by the usage-amount of a polymerization initiator and a chain transfer agent, and reaction conditions, The usage-amount is suitably adjusted according to these kinds.
- polymerization initiator examples include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis [2- (5-methyl-2 -Imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis (2-methylpropionamidine) disulfate, 2,2'-azobis (N, N'-dimethyleneisobutylamidine), 2,2 Azo initiators such as' -azobis [N- (2-carboxyethyl) -2-methylpropionamidine] hydrate (VA-057, manufactured by Wako Pure Chemical Industries, Ltd.), persulfates such as potassium persulfate and ammonium persulfate , Di (2-ethylhexyl) peroxydicarbonate, di (4-tert-butylcyclohexyl) peroxydicarbonate, di-sec-butyl Peroxydicarbonate, t
- the polymerization initiator may be used singly or as a mixture of two or more, but the total content is 0.005 to 1 part by weight with respect to 100 parts by weight of the monomer. Is preferably about 0.02 to 0.5 parts by weight.
- the amount of the polymerization initiator used is a monomer.
- the amount is preferably about 0.06 to 0.2 parts by weight, more preferably about 0.08 to 0.175 parts by weight with respect to 100 parts by weight of the total amount of the components.
- chain transfer agent examples include lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, and 2,3-dimercapto-1-propanol.
- the chain transfer agent may be used alone or in combination of two or more, but the total content is 0.1 parts by weight with respect to 100 parts by weight of the total amount of monomer components. Less than or equal to
- emulsifier used in emulsion polymerization examples include anionic emulsifiers such as sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzenesulfonate, ammonium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, and polyoxy Nonionic emulsifiers such as ethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, polyoxyethylene-polyoxypropylene block polymer and the like can be mentioned. These emulsifiers may be used alone or in combination of two or more.
- reactive emulsifiers emulsifiers into which radical polymerizable functional groups such as propenyl groups and allyl ether groups are introduced, specifically, for example, Aqualon HS-10, HS-20, KH-10, BC-05 BC-10, BC-20 (all of which are manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), Adekaria soap SE10N (manufactured by Asahi Denka Kogyo Co., Ltd.), and the like.
- Reactive emulsifiers are preferable because they are incorporated into the polymer chain after polymerization and thus have improved water resistance.
- the amount of the emulsifier used is preferably 0.3 to 5 parts by weight with respect to 100 parts by weight of the total amount of monomer components, and more preferably 0.5 to 1 part by weight from the viewpoint of polymerization stability and mechanical stability.
- the pressure-sensitive adhesive polymer used in the present invention usually has a weight average molecular weight in the range of 300,000 to 4,000,000. In view of durability, particularly heat resistance, it is preferable to use those having a weight average molecular weight of 500,000 to 3,000,000. Further, it is more preferably 650,000 to 2 million. A weight average molecular weight of less than 300,000 is not preferable in terms of heat resistance. Moreover, when a weight average molecular weight becomes larger than 4 million, it is unpreferable also at the point which bonding property and adhesive force fall.
- the weight average molecular weight is a value measured by GPC (gel permeation chromatography) and calculated in terms of polystyrene.
- the pressure-sensitive adhesive composition used in the present invention can contain a crosslinking agent.
- a crosslinking agent an organic crosslinking agent or a polyfunctional metal chelate can be used.
- the organic crosslinking agent include an isocyanate crosslinking agent, a peroxide crosslinking agent, an epoxy crosslinking agent, and an imine crosslinking agent.
- a polyfunctional metal chelate is one in which a polyvalent metal is covalently or coordinately bonded to an organic compound.
- Examples of polyvalent metal atoms include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti, and the like. can give.
- Examples of the atom in the organic compound that is covalently bonded or coordinated include an oxygen atom, and examples of the organic compound include an alkyl ester, an alcohol compound, a carboxylic acid compound, an ether compound, and a ketone compound.
- an isocyanate-based crosslinking agent and / or a peroxide-type crosslinking agent is preferable.
- the compound relating to the isocyanate-based crosslinking agent include isocyanate monomers such as tolylene diisocyanate, chlorophenylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, and these isocyanate monomers.
- Examples include isocyanate compounds added with trimethylolpropane, isocyanurates, burette compounds, and urethane prepolymer isocyanates such as polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, and polyisoprene polyols that have undergone addition reactions. be able to.
- a polyisocyanate compound which is one or a polyisocyanate compound derived from one selected from the group consisting of hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, and isophorone diisocyanate.
- hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, polyol-modified is selected from the group consisting of hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, and isophorone diisocyanate or a polyisocyanate compound derived therefrom.
- examples include hexamethylene diisocyanate, polyol-modified hydrogenated xylylene diisocyanate, trimer-type hydrogenated xylylene diisocyanate, and polyol-modified isophorone diisocyanate.
- the exemplified polyisocyanate compound is preferable because the reaction with a hydroxyl group proceeds rapidly, particularly using an acid or base contained in the polymer as a catalyst, and thus contributes to the speed of crosslinking.
- Any peroxide type crosslinking agent can be used as long as it generates radical active species by heating or light irradiation to promote crosslinking of the base polymer of the pressure-sensitive adhesive composition. However, workability and stability are improved. Considering this, it is preferable to use a peroxide having a half-life temperature of 80 ° C. to 160 ° C. for 1 minute, and it is more preferable to use a peroxide having a temperature of 90 ° C. to 140 ° C.
- Examples of the peroxide that can be used as the crosslinking agent include di (2-ethylhexyl) peroxydicarbonate (1 minute half-life temperature: 90.6 ° C.), di (4-t-butylcyclohexyl) peroxydi Carbonate (1 minute half-life temperature: 92.1 ° C), di-sec-butyl peroxydicarbonate (1 minute half-life temperature: 92.4 ° C), t-butyl peroxyneodecanoate (1 minute half-life Temperature: 103.5 ° C), t-hexyl peroxypivalate (1 minute half-life temperature: 109.1 ° C), t-butyl peroxypivalate (1 minute half-life temperature: 110.3 ° C), dilauroyl Peroxide (1 minute half-life temperature: 116.4 ° C.), di-n-octanoyl peroxide (1 minute half-life temperature: 117.4 ° C.), 1,1,3,3-tetra Tylbuty
- the peroxide half-life is an index representing the decomposition rate of the peroxide, and means the time until the remaining amount of peroxide is reduced to half.
- the decomposition temperature for obtaining a half-life at an arbitrary time and the half-life time at an arbitrary temperature are described in the manufacturer catalog, for example, “Organic peroxide catalog 9th edition by Nippon Oil & Fats Co., Ltd.” (May 2003) ".
- the amount of the crosslinking agent used is preferably 0.01 to 20 parts by weight, more preferably 0.03 to 10 parts by weight, with respect to 100 parts by weight of the pressure-sensitive adhesive polymer. If the crosslinking agent is less than 0.01 parts by weight, the cohesive force of the pressure-sensitive adhesive tends to be insufficient, and foaming may occur during heating. On the other hand, if it exceeds 20 parts by weight, the moisture resistance is not sufficient, Peeling easily occurs in reliability tests.
- the isocyanate-based crosslinking agent may be used alone or as a mixture of two or more. However, the total content is 100 parts by weight of the pressure-sensitive adhesive polymer.
- the polyisocyanate compound crosslinking agent is preferably contained in an amount of 0.01 to 2 parts by weight, more preferably 0.02 to 2 parts by weight, and more preferably 0.05 to 1.5 parts by weight. More preferably. It can be appropriately contained in consideration of cohesive force and prevention of peeling in a durability test.
- the peroxide may be used alone or as a mixture of two or more, but the total content thereof is 100 parts by weight of the pressure-sensitive adhesive polymer.
- the oxide content is 0.01 to 2 parts by weight, preferably 0.04 to 1.5 parts by weight, and more preferably 0.05 to 1 part by weight. In order to adjust processability, reworkability, cross-linking stability, peelability, and the like, it is appropriately selected within this range.
- the peroxide decomposition amount remaining after the reaction treatment for example, it can be measured by HPLC (High Performance Liquid Chromatography).
- the pressure-sensitive adhesive composition after the reaction treatment is taken out, immersed in 10 ml of ethyl acetate, extracted by shaking at 25 ° C. and 120 rpm for 3 hours with a shaker, and then at room temperature. Leave for 3 days. Next, 10 ml of acetonitrile was added, shaken at 120 rpm at 25 ° C. for 30 minutes, and about 10 ⁇ l of the extract obtained by filtration through a membrane filter (0.45 ⁇ m) was injected into the HPLC for analysis. The amount of peroxide can be set.
- silane coupling agent examples include silicon compounds having an epoxy structure such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane; Amino group-containing silicon compounds such as 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropylmethyldimethoxysilane; (Meth) acrylic group-containing silane coupling agents such as propyltrimethoxysilane; acetoacetyl group-containing trimethoxysilane, 3-acryloxypropyltrimethoxysilane, and 3-methacryloxypropyltriethoxysilane; 3-isocyan
- 3-glycidoxypropyltrimethoxysilane and acetoacetyl group-containing trimethoxysilane are preferably used because peeling can be effectively suppressed.
- the silane coupling agent can provide durability, particularly an effect of suppressing peeling in a humidified environment.
- the amount of the silane coupling agent used is 1 part by weight or less, further 0.01 to 1 part by weight, preferably 0.02 to 0.6 part by weight, based on 100 parts by weight of the pressure-sensitive adhesive polymer. When the amount of the silane coupling agent used is increased, the adhesive force to the liquid crystal cell is excessively increased, which may affect the reworkability.
- the pressure-sensitive adhesive composition used in the present invention may contain other known additives.
- the pressure-sensitive adhesive composition includes powders such as colorants and pigments, dyes, surfactants, Plasticizer, tackifier, surface lubricant, leveling agent, softener, antioxidant, anti-aging agent, light stabilizer, UV absorber, polymerization inhibitor, inorganic or organic filler, metal powder, particulate A foil or the like can be appropriately added depending on the application to be used.
- the pressure-sensitive adhesive composition forms a pressure-sensitive adhesive layer.
- it is necessary to fully consider the influence of the crosslinking treatment temperature and the crosslinking treatment time as well as adjusting the addition amount of the entire crosslinking agent. preferable.
- the crosslinking treatment temperature is preferably 170 ° C. or lower.
- crosslinking treatment may be performed at the temperature during the drying step of the pressure-sensitive adhesive layer, or may be performed by providing a separate crosslinking treatment step after the drying step.
- the crosslinking treatment time can be set in consideration of productivity and workability, but is usually about 0.2 to 20 minutes, preferably about 0.5 to 10 minutes.
- Adhesive layer The pressure-sensitive adhesive layer will be described.
- the polarizing plate with the pressure-sensitive adhesive layer of the present invention is obtained by forming a pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition on at least one surface of a polarizing film.
- a method for forming the pressure-sensitive adhesive layer for example, a method in which the pressure-sensitive adhesive composition is applied to a release-treated separator, and the polymerization solvent is dried and removed to form a pressure-sensitive adhesive layer, and then transferred to an optical film, or Examples include a method in which the pressure-sensitive adhesive composition is applied to an optical film, and a polymerization solvent is dried and removed to form a pressure-sensitive adhesive layer on the optical film.
- one or more solvents other than the polymerization solvent may be added as appropriate.
- a silicone release liner is preferably used as the release-treated separator.
- an appropriate method may be adopted as appropriate according to the purpose.
- a method of heating and drying the coating film is used.
- the heating and drying temperature is preferably 40 ° C to 200 ° C, more preferably 50 ° C to 180 ° C, and particularly preferably 70 ° C to 170 ° C.
- the drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.
- the pressure-sensitive adhesive layer can be formed after forming an anchor layer on the surface of the polarizing film or performing various easy adhesion treatments such as corona treatment and plasma treatment. You may perform an easily bonding process on the surface of an adhesive layer.
- a solution containing a urethane polymer (manufactured by Nagase ChemteX Corporation: Denatron B510-C, etc.) is mixed with a water / isopropyl alcohol (65:35 by volume) mixed solution. The content is adjusted to 0.2% by weight, and the adjusted solution is applied to a polarizing plate using Mayer bar # 5 and dried at 50 ° C. for 30 seconds to form an anchor coat layer having a thickness of 25 nm.
- a urethane polymer manufactured by Nagase ChemteX Corporation: Denatron B510-C, etc.
- the content is adjusted to 0.2% by weight
- the adjusted solution is applied to a polarizing plate using Mayer bar # 5 and dried at 50 ° C. for 30 seconds to form an anchor coat layer having a thickness of 25 nm.
- Various methods are used as a method for forming the pressure-sensitive adhesive layer. Specifically, for example, roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, die coater, etc. Examples thereof include an extrusion coating method.
- the thickness of the pressure-sensitive adhesive layer is not particularly limited and is, for example, about 1 to 100 ⁇ m.
- the thickness is preferably 1 to 50 ⁇ m, more preferably 1 to 40 ⁇ m, and still more preferably 1 to 35 ⁇ m.
- the thickness of the pressure-sensitive adhesive layer There is a tendency, and it is not preferable to reduce the thickness of the pressure-sensitive adhesive layer.
- the shrinkage stress of the polarizing plate can be reduced, and as a result, the adhesive durability can be maintained or improved even if the thickness of the pressure-sensitive adhesive layer is reduced.
- the pressure-sensitive adhesive layer When the pressure-sensitive adhesive layer is exposed, the pressure-sensitive adhesive layer may be protected with a peeled sheet (separator) until it is practically used.
- constituent material of the separator examples include, for example, plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films, porous materials such as paper, cloth, and nonwoven fabric, nets, foam sheets, metal foils, and laminates thereof.
- plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films
- porous materials such as paper, cloth, and nonwoven fabric, nets, foam sheets, metal foils, and laminates thereof.
- a plastic film is used suitably from the point which is excellent in surface smoothness.
- the plastic film is not particularly limited as long as it can protect the pressure-sensitive adhesive layer.
- polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer examples thereof include a coalesced film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, and an ethylene-vinyl acetate copolymer film.
- the thickness of the separator is usually about 5 to 200 ⁇ m, preferably about 5 to 100 ⁇ m.
- mold release and antifouling treatment with a silicone type, fluorine type, long chain alkyl type or fatty acid amide type release agent, silica powder, etc., coating type, kneading type, vapor deposition type It is also possible to perform antistatic treatment such as.
- the release property of the separator from the pressure-sensitive adhesive layer can be further improved by appropriately performing a release treatment such as silicone treatment, long-chain alkyl treatment, or fluorine treatment on the surface of the separator.
- seat which carried out the peeling process used in preparation of the said polarizing plate with an adhesive layer can be used as a separator of a polarizing plate with an adhesive layer as it is, and it can simplify in a process surface by doing in this way.
- the polarizing film will be described.
- the polarizing film is not particularly limited, and various types can be used.
- polarizing films include dichroic properties of iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films. Examples thereof include those obtained by adsorbing a substance and uniaxially stretched, and polyene-based oriented films such as dehydrated polyvinyl alcohol and dehydrochlorinated polyvinyl chloride. Among these, a polarizing film composed of a polyvinyl alcohol film and a dichroic substance such as iodine is preferable.
- the thicknesses of these polarizing films are not particularly limited, but preferred polarizing film thicknesses will be described in detail later.
- a polarizing film in which a polyvinyl alcohol film is dyed with iodine and uniaxially stretched can be prepared by, for example, dyeing polyvinyl alcohol by immersing it in an aqueous solution of iodine and stretching it 3 to 7 times the original length. . If necessary, it can be immersed in an aqueous solution such as potassium iodide which may contain boric acid, zinc sulfate, zinc chloride or the like. Further, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
- Stretching can be performed after dyeing with iodine, while dyeing, or before dyeing with iodine. It can also be stretched in an aqueous solution of boric acid or potassium iodide or in a water bath.
- a transparent protective film can be provided on the surface of the polarizing film on the side where the pressure-sensitive adhesive layer is not provided.
- a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is used as a material constituting the transparent protective film.
- thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, cyclic Examples thereof include polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof.
- cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, cyclic Examples thereof include polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof.
- transparent protective films examples include polymer films described in JP-A-2001-343529 (WO01 / 37007), for example, (A) a heat having a substituted and / or unsubstituted imide group in the side chain.
- the resin composition examples include a plastic resin and (B) a thermoplastic resin having a substituted and / or unsubstituted phenyl and nitrile group in the side chain.
- a specific example is a film of a resin composition containing an alternating copolymer composed of isobutylene and N-methylmaleimide and an acrylonitrile / styrene copolymer.
- the film a film made of a mixed extruded product of the resin composition or the like can be used. Since these films have a small phase difference and a small photoelastic coefficient, problems such as unevenness due to the distortion of the polarizing plate can be eliminated, and since the moisture permeability is small, the humidification durability is excellent.
- the thickness of the transparent protective film can be appropriately determined, but is generally about 1 to 500 ⁇ m from the viewpoints of workability such as strength and handleability, and thin layer properties. 1 to 300 ⁇ m is particularly preferable, and 5 to 200 ⁇ m is more preferable. The transparent protective film is particularly suitable when the thickness is from 5 to 150 ⁇ m.
- the transparent protective film it is preferable to use at least one selected from cellulose resin, polycarbonate resin, cyclic polyolefin resin, and (meth) acrylic resin.
- Cellulose resin is an ester of cellulose and fatty acid.
- cellulose ester resins include triacetyl cellulose, diacetyl cellulose, tripropionyl cellulose, dipropionyl cellulose, and the like.
- triacetyl cellulose is particularly preferable.
- Many products of triacetylcellulose are commercially available, which is advantageous in terms of availability and cost. Examples of commercially available products of triacetylcellulose include trade names “UV-50”, “UV-80”, “SH-80”, “TD-80U”, “TD-TAC”, “UZ” manufactured by Fuji Film Co., Ltd. -TAC "and” KC series "manufactured by Konica.
- these triacetyl celluloses have an in-plane retardation (Re) of almost zero, but a thickness direction retardation (Rth) of about 60 nm.
- a cellulose resin film having a small thickness direction retardation can be obtained, for example, by treating the cellulose resin.
- a base film such as polyethylene terephthalate, polypropylene, and stainless steel coated with a solvent such as cyclopentanone and methyl ethyl ketone is bonded to a general cellulose film and dried by heating (for example, 80 to 150 ° C. 3 to 10 minutes), and then peeling the base film; a solution obtained by dissolving norbornene resin, (meth) acrylic resin, etc. in a solvent such as cyclopentanone, methyl ethyl ketone, etc. into a general cellulose resin film
- Examples include a method of coating and drying by heating (for example, at 80 to 150 ° C. for about 3 to 10 minutes) and then peeling the coated film.
- a fatty acid cellulose resin film with a controlled degree of fat substitution can be used as the cellulose resin film having a small thickness direction retardation.
- triacetyl cellulose has an acetic acid substitution degree of about 2.8, but Rth can be reduced by controlling the acetic acid substitution degree to 1.8 to 2.7.
- Rth By adding a plasticizer such as dibutyl phthalate, p-toluenesulfonanilide, acetyltriethyl citrate, etc. to the fatty acid-substituted cellulose resin, Rth can be controlled to be small.
- the addition amount of the plasticizer is preferably 40 parts by weight or less, more preferably 1 to 20 parts by weight, and further preferably 1 to 15 parts by weight with respect to 100 parts by weight of the fatty acid cellulose resin.
- cyclic polyolefin resin examples are preferably norbornene resins.
- the cyclic olefin-based resin is a general term for resins that are polymerized using a cyclic olefin as a polymerization unit. Resin. Specific examples include cyclic olefin ring-opening (co) polymers, cyclic olefin addition polymers, cyclic olefins and ⁇ -olefins such as ethylene and propylene (typically random copolymers), And graft polymers obtained by modifying them with an unsaturated carboxylic acid or a derivative thereof, and hydrides thereof. Specific examples of the cyclic olefin include norbornene monomers.
- Various products are commercially available as cyclic polyolefin resins.
- trade names “ZEONEX” and “ZEONOR” manufactured by ZEON CORPORATION product names “ARTON” manufactured by JSR Corporation, “TOPAS” manufactured by TICONA, and product names manufactured by Mitsui Chemicals, Inc. “APEL” may be mentioned.
- the (meth) acrylic resin those having a Tg (glass transition temperature) of preferably 115 ° C. or higher, more preferably 120 ° C. or higher, still more preferably 125 ° C. or higher, particularly preferably 130 ° C. or higher.
- Tg glass transition temperature
- the upper limit of Tg of the (meth) acrylic resin is not particularly limited, it is preferably 170 ° C. or lower from the viewpoint of moldability and the like. From (meth) acrylic resin, a film having in-plane retardation (Re) and thickness direction retardation (Rth) of almost zero can be obtained.
- any appropriate (meth) acrylic resin can be adopted as long as the effects of the present invention are not impaired.
- poly (meth) acrylic acid ester such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester- (Meth) acrylic acid copolymer, (meth) methyl acrylate-styrene copolymer (MS resin, etc.), a polymer having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, Methyl methacrylate- (meth) acrylate norbornyl copolymer, etc.).
- Preferable examples include C1-6 alkyl poly (meth) acrylates such as poly (meth) acrylate methyl. More preferred is a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight).
- the (meth) acrylic resin examples include, for example, (Meth) acrylic resin having a ring structure in the molecule described in Acrypet VH and Acrypet VRL20A manufactured by Mitsubishi Rayon Co., Ltd., and JP-A-2004-70296. And a high Tg (meth) acrylic resin system obtained by intramolecular crosslinking or intramolecular cyclization reaction.
- (Meth) acrylic resin having a lactone ring structure can also be used as the (meth) acrylic resin. It is because it has high mechanical strength by high heat resistance, high transparency, and biaxial stretching.
- Examples of the (meth) acrylic resin having a lactone ring structure include JP 2000-230016, JP 2001-151814, JP 2002-120326, JP 2002-254544, and JP 2005. Examples thereof include (meth) acrylic resins having a lactone ring structure described in Japanese Patent No. 146084.
- the (meth) acrylic resin having a lactone ring structure preferably has a ring pseudo structure represented by the following general formula (Formula 6).
- R 1 , R 2 and R 3 each independently represent a hydrogen atom or an organic residue having 1 to 20 carbon atoms.
- the organic residue may contain an oxygen atom.
- the content of the lactone ring structure represented by the general formula (Formula 1) in the structure of the (meth) acrylic resin having a lactone ring structure is preferably 5 to 90% by weight, more preferably 10 to 70% by weight, More preferably, it is 10 to 60% by weight, and particularly preferably 10 to 50% by weight.
- the content of the lactone ring structure represented by the general formula (Chemical Formula 1) in the structure of the (meth) acrylic resin having a lactone ring structure is less than 5% by weight, the heat resistance, solvent resistance, and surface hardness are low. May be insufficient.
- the content ratio of the lactone ring structure represented by the general formula (Chemical Formula 6) in the structure of the (meth) acrylic resin having a lactone ring structure is more than 90% by weight, molding processability may be poor.
- the (meth) acrylic resin having a lactone ring structure has a mass average molecular weight (sometimes referred to as a weight average molecular weight) of preferably 1,000 to 2,000,000, more preferably 5,000 to 1,000,000, still more preferably 10,000 to 500,000, and particularly preferably. Is from 50,000 to 500,000. If the mass average molecular weight is out of the above range, it is not preferable from the viewpoint of moldability.
- the (meth) acrylic resin having a lactone ring structure preferably has a Tg of 115 ° C. or higher, more preferably 120 ° C. or higher, still more preferably 125 ° C. or higher, and particularly preferably 130 ° C. or higher. Since Tg is 115 ° C. or higher, for example, when incorporated into a polarizing plate as a transparent protective film, it has excellent durability.
- the upper limit of Tg of the (meth) acrylic resin having the lactone ring structure is not particularly limited, it is preferably 170 ° C. or less from the viewpoint of moldability and the like.
- the (meth) acrylic resin having a lactone ring structure is more preferable as the total light transmittance of a molded product obtained by injection molding measured by a method according to ASTM-D-1003 is higher, preferably 85 % Or more, more preferably 88% or more, and still more preferably 90% or more.
- the total light transmittance is a measure of transparency. If the total light transmittance is less than 85%, the transparency may be lowered.
- the transparent protective film may be subjected to surface modification treatment in order to improve adhesiveness with the polarizing film before applying the adhesive.
- Specific examples of the treatment include corona treatment, plasma treatment, flame treatment, ozone treatment, primer treatment, glow treatment, saponification treatment, and treatment with a coupling agent.
- an antistatic layer can be appropriately formed.
- the surface of the transparent protective film to which the polarizing film is not adhered may be subjected to a treatment for the purpose of hard coat layer, antireflection treatment, sticking prevention, diffusion or antiglare.
- the surface treatment film is also provided by bonding to the front plate.
- Anti-reflective films such as hard coat films used to impart surface scratch resistance, anti-glare treated films to prevent reflection on image display devices, anti-reflective films, low-reflective films, etc. Is mentioned.
- the front plate is attached to the surface of the image display device in order to protect the image display device such as a liquid crystal display device, an organic EL display device, a CRT, or a PDP, to give a high-class feeling, or to differentiate by design. It is provided together.
- the front plate has a pattern phase difference layer (for example, a patterned 1/4 wavelength phase difference) having a function of converting a left eye image and a right eye image into different polarization states in 3D-TV.
- the membrane Used as a support for the membrane). For example, in a liquid crystal display device, it is provided above the polarizing plate on the viewing side.
- the pressure-sensitive adhesive layer of the present invention the same effect as that of the glass substrate is exhibited not only on the glass substrate but also on a plastic substrate such as a polycarbonate substrate and a polymethyl methacrylate substrate as the front plate. .
- An optical film in which an optical layer is laminated on a polarizing plate can be formed by a method of sequentially laminating separately in the manufacturing process of a liquid crystal display device or the like.
- the manufacturing process of the liquid crystal display device and the like can be improved because of its excellent performance and assembly work.
- Appropriate bonding means can be used for lamination.
- the polarizing plate with an adhesive layer of the present invention can be preferably used for forming various image display devices such as a liquid crystal display device.
- the liquid crystal display device can be formed according to the conventional method. That is, the liquid crystal display device is generally formed by appropriately assembling components such as a display panel such as a liquid crystal cell, an adhesive optical film, and an illumination system as required, and incorporating a drive circuit. There is no particular limitation except that the polarizing plate with the pressure-sensitive adhesive layer according to the present invention is used.
- the liquid crystal cell any type such as a TN type, STN type, ⁇ type, VA type, IPS type, or the like can be used.
- liquid crystal display devices such as a liquid crystal display device in which an adhesive optical film is disposed on one side or both sides of a display panel such as a liquid crystal cell, or a backlight or reflector used in an illumination system can be formed.
- the polarizing plate with an adhesive layer according to the present invention can be installed on one side or both sides of a display panel such as a liquid crystal cell.
- optical films are provided on both sides, they may be the same or different.
- liquid crystal display device for example, a single layer or a suitable layer such as a diffusion plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusion plate, a backlight, Two or more layers can be arranged.
- a suitable layer such as a diffusion plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusion plate, a backlight.
- organic electroluminescence device organic EL display device: OLED
- a transparent electrode, an organic light emitting layer, and a metal electrode are sequentially laminated on a transparent substrate to form a light emitter (organic electroluminescent light emitter).
- the organic light emitting layer is a laminate of various organic thin films, for example, a laminate of a hole injection layer made of a triphenylamine derivative and a light emitting layer made of a fluorescent organic solid such as anthracene, Alternatively, a structure having various combinations such as a laminate of such a light-emitting layer and an electron injection layer composed of a perylene derivative, or a stack of these hole injection layer, light-emitting layer, and electron injection layer is known. It has been.
- holes and electrons are injected into the organic light-emitting layer by applying a voltage to the transparent electrode and the metal electrode, and the energy generated by recombination of these holes and electrons excites the phosphor material. Then, light is emitted on the principle that the excited fluorescent material emits light when returning to the ground state.
- the mechanism of recombination in the middle is the same as that of a general diode, and as can be predicted from this, the current and the emission intensity show strong nonlinearity with rectification with respect to the applied voltage.
- an organic EL display device in order to extract light emitted from the organic light emitting layer, at least one of the electrodes must be transparent, and a transparent electrode usually formed of a transparent conductor such as indium tin oxide (ITO) is used as an anode. It is used as On the other hand, in order to facilitate electron injection and increase luminous efficiency, it is important to use a material having a small work function for the cathode, and usually metal electrodes such as Mg—Ag and Al—Li are used.
- ITO indium tin oxide
- the organic light emitting layer is formed of a very thin film having a thickness of about 10 nm. For this reason, the organic light emitting layer transmits light almost completely like the transparent electrode. As a result, light that is incident from the surface of the transparent substrate at the time of non-light emission, passes through the transparent electrode and the organic light emitting layer, and is reflected by the metal electrode is again emitted to the surface side of the transparent substrate.
- the display surface of the organic EL display device looks like a mirror surface.
- an organic EL display device comprising an organic electroluminescent light emitting device comprising a transparent electrode on the surface side of an organic light emitting layer that emits light upon application of a voltage and a metal electrode on the back side of the organic light emitting layer, the surface of the transparent electrode While providing a polarizing plate on the side, a retardation plate can be provided between the transparent electrode and the polarizing plate.
- the retardation plate and the polarizing plate have a function of polarizing light incident from the outside and reflected by the metal electrode, there is an effect that the mirror surface of the metal electrode is not visually recognized by the polarization action.
- the mirror surface of the metal electrode can be completely shielded by configuring the retardation plate with a quarter-wave plate and adjusting the angle formed by the polarization direction of the polarizing plate and the retardation plate to ⁇ / 4. .
- linearly polarized light becomes generally elliptically polarized light by the phase difference plate, but becomes circularly polarized light particularly when the phase difference plate is a quarter wavelength plate and the angle formed by the polarization direction of the polarizing plate and the phase difference plate is ⁇ / 4. .
- This circularly polarized light is transmitted through the transparent substrate, the transparent electrode, and the organic thin film, reflected by the metal electrode, is again transmitted through the organic thin film, the transparent electrode, and the transparent substrate, and becomes linearly polarized light again on the retardation plate. And since this linearly polarized light is orthogonal to the polarization direction of a polarizing plate, it cannot permeate
- an elliptically polarizing plate or a circularly polarizing plate in which a retardation plate and a polarizing plate are combined can be used via an adhesive layer in order to block specular reflection.
- an elliptical polarizing plate or a circular polarizing plate bonded to the touch panel via an adhesive layer is applied to the organic EL panel without directly bonding the elliptical polarizing plate or the circular polarizing plate to the organic EL panel. be able to.
- the resistive touch panel is composed of a touch-side touch panel electrode plate having a transparent conductive thin film and a display-side touch panel electrode plate having a transparent conductive thin film through a spacer so that the transparent conductive thin films face each other. They are arranged opposite to each other.
- a transparent conductive film having a transparent conductive thin film having a predetermined pattern shape is usually formed on the entire surface of the display unit.
- the pressure-sensitive adhesive optical film of the present invention is applied to either the touch side or the display side. [Thinning of polarizing film] The thinning of the polarizing film will be described.
- thermoplastic resin substrate As described above, as one method for producing a polarizing film (so-called polarizer) in which a dichroic substance is adsorbed and oriented by dyeing and stretching treatment on a polyvinyl alcohol resin (PVA resin) layer, a thermoplastic resin substrate is used.
- polarizer a polarizing film
- PVA resin polyvinyl alcohol resin
- a laminate in which a thin PVA resin layer is formed on a thermoplastic resin substrate is produced by applying an aqueous solution of a PVA resin to a thermoplastic resin substrate and drying the moisture.
- the produced laminate is stretched in the air at a stretching temperature of 110 ° C., for example, using a stretching device provided in an oven.
- the dichroic substance is adsorbed by dyeing on the PVA resin layer oriented by stretching.
- a dichroic substance is made to adsorb
- the laminate on which the dichroic substance is adsorbed is stretched in the air at a stretching temperature of 90 ° C. In this way, a polarizing film made of a PVA resin in which a dichroic substance is oriented can be manufactured.
- a method for producing a polarizing film using a thermoplastic resin substrate can produce a thin polarizing film more uniformly than a method for producing a polarizing film using a single layer of PVA resin.
- a polarizing film used for a liquid crystal display device bonded to the front and back of a liquid crystal cell is a PVA system having a thickness of 50 to 80 ⁇ m as disclosed in JP-A-2005-266325, according to a method for producing a polarizing film using a single layer body.
- the resin monolayer is applied to a conveying device having a plurality of sets of rolls with different peripheral speeds, and the dichroic substance is adsorbed to the PVA-based resin monolayer by immersion in a dyeing solution, and in an aqueous solution at around 60 ° C. Manufactured by stretching.
- This is a polarizing film made of a single layer and has a thickness of 15 to 35 ⁇ m.
- a polarizing film manufactured by this method has been put to practical use for large-sized televisions as having a single transmittance of 42% or higher and a polarization degree of 99.95% or higher.
- a polarizing film for television is usually provided with a 40 to 80 ⁇ m TAC (triacetylcellulose) film as a protective film on both sides of the polarizing film. Combined laminates are used.
- the present invention with respect to the thickness of the polarizing film, it is expected that the conventional film having a thickness of about 30 ⁇ m or less will have a sufficient effect in terms of optical characteristics, but it is relatively less than about 20 ⁇ m. It is considered that an excellent effect is obtained in a thin object.
- the present invention has a thickness of 10 ⁇ m or less, particularly 7 ⁇ m or less, and in a thin polarizing film having a thickness of 1 ⁇ m or more, reduces shrinkage stress which is a problem in terms of durability, while achieving high optical characteristics. It has a remarkable effect.
- [Production method of thin polarizing film] A method for producing a thin polarizing film will be described.
- PVA As a method for producing a thin polarizing film, typically, PVA as described in JP-A-51-069644, JP-A-2000-338329, WO2010 / 100917, or Japanese Patent Application No. 2010-197413 is used.
- the manufacturing method including the process of extending
- WO2010 / 100917 specification or Japanese Patent Application No. 2010-266992, and Japanese Patent Application No. 2010 can be obtained because the polarizing performance can be improved at a high magnification.
- a process comprising a step of stretching in a boric acid aqueous solution as described in the specification of -269002 is preferable, and in particular, stretching in a boric acid aqueous solution described in the specification of Japanese Patent Application Nos. 2010-263692 and 2010-269002
- a manufacturing method including a step of stretching in the air auxiliary is preferable.
- the polyvinyl alcohol formed on the amorphous ester thermoplastic resin substrate of the continuous web
- the dichroic material was oriented by producing a stretched intermediate product comprising an oriented polyvinyl alcohol-based resin layer by high-temperature stretching in the air on the resin-based resin layer, and adsorption of the dichroic material on the stretched intermediate product.
- Polarized light having a thickness of 10 ⁇ m or less comprising a polyvinyl alcohol-based resin layer in which a dichroic substance is oriented by a step of generating a colored intermediate product composed of a polyvinyl alcohol-based resin layer and stretching in a boric acid solution with respect to the colored intermediate product. It is desirable to use a thin polarizing film manufactured by a method for manufacturing a thin polarizing film including a step of forming a film.
- the total draw ratio of the polyvinyl alcohol resin layer formed on the amorphous ester thermoplastic resin base material by high-temperature drawing in the air and drawing in boric acid solution should be 5 times or more. Is desirable.
- stretching can be 60 degreeC or more. Before stretching the colored intermediate product in the aqueous boric acid solution, it is desirable to insolubilize the colored intermediate product. In this case, the colored intermediate product is added to the aqueous boric acid solution whose liquid temperature does not exceed 40 ° C. It is desirable to do so by dipping.
- the amorphous ester-based thermoplastic resin base material is amorphous polyethylene containing copolymerized polyethylene terephthalate copolymerized with isophthalic acid, copolymerized polyethylene terephthalate copolymerized with cyclohexanedimethanol, or other copolymerized polyethylene terephthalate. It can be terephthalate and is preferably made of a transparent resin, and its thickness can be at least 7 times the thickness of the polyvinyl alcohol resin layer to be formed.
- the draw ratio of the high-temperature drawing in the air is preferably 3.5 times or less, and the drawing temperature of the high-temperature drawing in the air is preferably not less than the glass transition temperature of the polyvinyl alcohol resin, specifically in the range of 95 ° C. to 150 ° C. .
- the total stretching ratio of the polyvinyl alcohol-based resin layer formed on the amorphous ester-based thermoplastic resin substrate is 5 to 7.5 times. preferable.
- the total stretching ratio of the polyvinyl alcohol-based resin layer formed on the amorphous ester-based thermoplastic resin substrate is 5 times or more and 8.5 times or less. Is preferred. More specifically, a thin polarizing film can be produced by the following method.
- a base material for a continuous web of isophthalic acid copolymerized polyethylene terephthalate (amorphous PET) in which 6 mol% of isophthalic acid is copolymerized is prepared.
- the glass transition temperature of amorphous PET is 75 ° C.
- a laminate comprising a continuous web of amorphous PET substrate and a polyvinyl alcohol (PVA) layer is prepared as follows. Incidentally, the glass transition temperature of PVA is 80 ° C.
- a 200 ⁇ m-thick amorphous PET base material and a 4-5% PVA aqueous solution in which PVA powder having a polymerization degree of 1000 or more and a saponification degree of 99% or more are dissolved in water are prepared.
- an aqueous PVA solution is applied to a 200 ⁇ m thick amorphous PET substrate and dried at a temperature of 50 to 60 ° C. to obtain a laminate in which a 7 ⁇ m thick PVA layer is formed on the amorphous PET substrate. .
- a thin and highly functional polarizing film having a thickness of 3 ⁇ m is manufactured from the laminate including the PVA layer having a thickness of 7 ⁇ m through the following steps including a two-stage stretching process of air-assisted stretching and boric acid water stretching.
- the laminate including the 7 ⁇ m-thick PVA layer is integrally stretched with the amorphous PET substrate to produce a stretched laminate including the 5 ⁇ m-thick PVA layer.
- a laminate including a 7 ⁇ m-thick PVA layer is subjected to a stretching apparatus disposed in an oven set to a stretching temperature environment of 130 ° C. so that the stretching ratio is 1.8 times. Are stretched uniaxially at the free end.
- the PVA layer contained in the stretched laminate is changed to a 5 ⁇ m thick PVA layer in which PVA molecules are oriented.
- this colored laminate has a single layer transmittance of the PVA layer constituting the high-performance polarizing film that is finally produced by using the stretched laminate in a staining solution containing iodine and potassium iodide at a liquid temperature of 30 ° C.
- Iodine is adsorbed to the PVA layer contained in the stretched laminate by dipping for an arbitrary period of time so as to be 40 to 44%.
- the staining solution uses water as a solvent, and an iodine concentration within the range of 0.12 to 0.30% by weight and a potassium iodide concentration within the range of 0.7 to 2.1% by weight.
- concentration ratio of iodine and potassium iodide is 1 to 7.
- potassium iodide is required to dissolve iodine in water. More specifically, by immersing the stretched laminate in a dyeing solution having an iodine concentration of 0.30% by weight and a potassium iodide concentration of 2.1% by weight for 60 seconds, iodine is applied to a 5 ⁇ m-thick PVA layer in which PVA molecules are oriented. A colored laminate is adsorbed on the substrate.
- the colored laminated body is further stretched integrally with the amorphous PET base material by the second stage boric acid underwater stretching step to produce an optical film laminate including a PVA layer constituting a highly functional polarizing film having a thickness of 3 ⁇ m.
- the optical film laminate is subjected to stretching by applying the colored laminate to a stretching apparatus provided in a treatment apparatus set to a boric acid aqueous solution having a liquid temperature range of 60 to 85 ° C. containing boric acid and potassium iodide. It is stretched uniaxially at the free end so that the magnification is 3.3 times. More specifically, the liquid temperature of the boric acid aqueous solution is 65 ° C.
- the colored laminate having an adjusted iodine adsorption amount is first immersed in an aqueous boric acid solution for 5 to 10 seconds. After that, the colored laminate is passed as it is between a plurality of sets of rolls with different peripheral speeds, which is a stretching apparatus installed in the processing apparatus, and the stretching ratio can be freely increased to 3.3 times over 30 to 90 seconds. Stretch uniaxially.
- the PVA layer contained in the colored laminate is changed into a PVA layer having a thickness of 3 ⁇ m in which the adsorbed iodine is oriented higher in one direction as a polyiodine ion complex.
- This PVA layer constitutes a highly functional polarizing film of the optical film laminate.
- the optical film laminate was removed from the boric acid aqueous solution and adhered to the surface of the 3 ⁇ m-thick PVA layer formed on the amorphous PET substrate by the washing step. It is preferable to wash boric acid with an aqueous potassium iodide solution. Thereafter, the washed optical film laminate is dried by a drying process using hot air at 60 ° C.
- the cleaning process is a process for eliminating appearance defects such as boric acid precipitation.
- an adhesive is applied to the surface of a 3 ⁇ m-thick PVA layer formed on an amorphous PET substrate by a bonding and / or transfer process.
- the amorphous PET substrate can be peeled off, and the 3 ⁇ m thick PVA layer can be transferred to the 80 ⁇ m thick triacetyl cellulose film.
- the manufacturing method of said thin-shaped polarizing film may include another process other than the said process.
- Examples of other steps include an insolubilization step, a crosslinking step, and a drying (adjustment of moisture content) step.
- the other steps can be performed at any appropriate timing.
- the insolubilization step is typically performed by immersing the PVA resin layer in a boric acid aqueous solution. By performing the insolubilization treatment, water resistance can be imparted to the PVA resin layer.
- the concentration of the boric acid aqueous solution is preferably 1 to 4 parts by weight with respect to 100 parts by weight of water.
- the liquid temperature of the insolubilizing bath (boric acid aqueous solution) is preferably 20 ° C.
- the insolubilization step is performed after the laminate is manufactured and before the dyeing step and the underwater stretching step.
- the crosslinking step is typically performed by immersing the PVA resin layer in an aqueous boric acid solution.
- the concentration of the boric acid aqueous solution is preferably 1 to 4 parts by weight with respect to 100 parts by weight of water.
- blend iodide it is preferable to mix
- the blending amount of iodide is preferably 1 to 5 parts by weight with respect to 100 parts by weight of water. Specific examples of the iodide are as described above.
- the liquid temperature of the crosslinking bath is preferably 20 ° C. to 50 ° C.
- the crosslinking step is performed before the second boric acid aqueous drawing step.
- the dyeing step, the crosslinking step, and the second boric acid aqueous drawing step are performed in this order.
- a polyvinyl web-based polarizing film made of a polyvinyl alcohol resin in which a dichroic material is oriented, and formed on an amorphous ester thermoplastic resin substrate
- the laminate including the alcohol-based resin layer is stretched in a two-stage stretching process consisting of air-assisted stretching and boric acid-water stretching, and has a thickness of 10 ⁇ m or less.
- the degree of polarization is P, P> ⁇ (100.929T ⁇ 42.4 ⁇ 1) ⁇ 100 (where T ⁇ 42.3) and P ⁇ 99.9 (where T ⁇ 42.3)
- a polarizing film having optical characteristics satisfying the conditions can be obtained, and this polarizing film can be used in the present invention.
- the present invention will be described in more detail with reference to examples. The present invention is not limited to these examples.
- ⁇ Preparation of pressure-sensitive adhesive composition > 0.3 part of dibenzoyl peroxide (Nippon Yushi Co., Ltd .: Nyper BMT) and 0.1 part of trimethylolpropane xylylene diisocyanate (Mitsui Takeda Chemical) per 100 parts of solid content of this acrylic adhesive polymer solution Co., Ltd .: Takenate D110N) and 0.2 part of a silane coupling agent (manufactured by Soken Chemical Co., Ltd .: A-100, acetoacetyl group-containing silane coupling agent) are blended into an acrylic pressure-sensitive adhesive composition ( An adhesive A) was obtained.
- the amount of the acid component in the total monomer component constituting the pressure-sensitive adhesive polymer according to the above method with 95.5 parts of butyl acrylate, 0.5 part of 4-hydroxybutyl acrylate, and 4 parts of acrylic acid.
- a solution containing an acrylic pressure-sensitive adhesive polymer having a content of 4% by weight was obtained.
- the weight average molecular weight of the acrylic pressure-sensitive adhesive polymer contained in the obtained solution was 1,700,000.
- 0.6 parts of trimethylolpropane tolylene diisocyanate (Nippon Polyurethane Co., Ltd .: Coronate L) is blended in place of D110N, and an acrylic pressure-sensitive adhesive composition is prepared according to the above method. (Adhesive C) was obtained.
- a laminated body in which a PVA layer having a thickness of 24 ⁇ m is formed on an amorphous PET substrate is produced by air-assisted stretching at a stretching temperature of 130 degrees, and then stretched.
- a colored laminate is produced by dyeing the laminate, and the colored laminate is further stretched integrally with an amorphous PET substrate so that the total draw ratio is 5.94 times by stretching in boric acid water at a stretching temperature of 65 degrees.
- An optical film laminate including a 10 ⁇ m thick PVA layer was produced.
- the PVA molecules in the PVA layer formed on the amorphous PET substrate by such two-stage stretching are oriented in the higher order, and the iodine adsorbed by the dyeing is oriented in the one direction as the polyiodine ion complex. It was possible to produce an optical film laminate including a PVA layer having a thickness of 10 ⁇ m and constituting a highly functional polarizing film. Furthermore, after applying a saponified 80 ⁇ m-thick triacetyl cellulose film while applying a polyvinyl alcohol adhesive on the surface of the polarizing film of the optical film laminate, the amorphous PET substrate was peeled off and polarized Plate 2 was prepared.
- a polarizing plate 3 including a polarizing film having a thickness of 7 ⁇ m was obtained by the same method as that for producing the thin polarizing film except that the thickness of the PVA layer of the laminate was 17 ⁇ m.
- a polarizing plate 4 including a polarizing film having a thickness of 4 ⁇ m was obtained by the same method as that for producing the thin polarizing film except that the thickness of the PVA layer of the laminate was set to 10 ⁇ m.
- Example 1 The pressure-sensitive adhesive A is subjected to silicone treatment on one side of a 38 ⁇ m polyethylene terephthalate (PET) film (MRF38, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) so that the thickness of the pressure-sensitive adhesive layer after drying is 20 ⁇ m. And dried at 155 ° C. for 1 minute, and transferred to the polarizing plate 1 to prepare a polarizing plate with an adhesive layer.
- PET polyethylene terephthalate
- Examples 2 to 10 Using the combinations of pressure-sensitive adhesives and polarizing plates as shown in Table 1, the polarizing plates with pressure-sensitive adhesive layers of Examples 2 to 10 were produced in the same manner as in Example 1.
- Example 11 A polarizing plate with a pressure-sensitive adhesive layer of Example 11 in the same manner as in Example 1 except that the pressure-sensitive adhesive D and the polarizing plate 4 were used and applied so that the thickness of the pressure-sensitive adhesive layer after drying was 5 ⁇ m. A plate was made.
- Comparative Examples 1 to 4 A polarizing plate with a pressure-sensitive adhesive layer of Comparative Example 1 was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive E was used instead of the pressure-sensitive adhesive A. Similarly, using the combination of the pressure-sensitive adhesive and the polarizing plate as shown in Table 1, the polarizing plates with pressure-sensitive adhesive layers of Comparative Examples 2 to 4 were produced.
- the polarizing plate with the pressure-sensitive adhesive layer was subjected to a durability test by leaving it for 300 hours under a moist heat condition of a temperature of 60 ° C. and a humidity of 90%, and then the polarizing plate had a size of 50 mm ⁇ 25 mm from the center in the width direction.
- a sample was cut out so that the absorption axis of the sample was 45 ° with respect to the long side, and the degree of polarization (P) was determined using an integrating sphere type transmittance measuring machine (Murakami Color Research Laboratory Co., Ltd .: DOT-3C). It was measured.
- the measurement results are shown in Table 1 as the amount of change ( ⁇ ) before and after the durability test of the degree of polarization (P).
- the acid component is less than 8% by weight, preferably 6% by weight or less. It is understood that it should be. Moreover, from the result of comparing Examples 10 and 11, by reducing the thickness of the pressure-sensitive adhesive layer with respect to the polarizing film having the same film thickness, the total amount of acid with respect to the polarizing film is reduced, and the decrease in the degree of polarization is suppressed. It is inferred that
- the sample was cut into a length of 420 mm and a width of 320 mm, and adhered to both surfaces of a non-alkali glass plate having a thickness of 0.7 mm using a laminator. Subsequently, the sample was autoclaved at 50 ° C. and 5 atm for 15 minutes to completely adhere the sample to an alkali-free glass plate. Samples subjected to such treatment were subjected to treatment (heating test) at 80 ° C. for 500 hours, and further subjected to treatment (humidification test) at 60 ° C. and 90% RH for 500 hours, and then foamed, peeled and floated. The state was visually evaluated according to the following criteria.
- the polarizing plate with the pressure-sensitive adhesive layer of the example did not have any practical problems in terms of durability (such as “none”).
- the pressure-sensitive adhesive layer-attached polarizing plate obtained by using a thin polarizing film is very excellent not only in optical properties such as the degree of polarization but also in durability.
- the sample was cut into a length of 420 mm and a width of 320 mm, attached to a non-alkali glass plate having a thickness of 0.7 mm using a laminator, and then autoclaved at 50 ° C. and 5 atm for 15 minutes for complete adhesion. Thereafter, the sample was peeled off from the alkali-free glass plate by human hands, and the reworkability was evaluated according to the following criteria.
- ⁇ The sample was slightly broken but was able to be peeled well.
- ⁇ The sample was broken but could be peeled off by peeling again. The sample broke and could not be removed by re-peeling
- the present invention it is possible to obtain a polarizing plate with an adhesive layer that is excellent in reliability of optical properties, adhesion durability, and reworkability.
- a decrease in optical reliability such as the degree of polarization due to deterioration of the polarizing film can be suppressed.
- display defects such as a decrease in contrast occur in the case of liquid crystals, and various defects such as a hue defect and a decrease in antireflection function occur in the case of OLEDs. Occurrence and the like can be prevented.
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Abstract
Description
また、近年、携帯電話などのモバイル用途の画像表示装置では、特にデザイン性や携帯性の面から、モジュール全体を薄く軽量化していく傾向にある。画像表示装置に使用される偏光板などの光学フィルムについても、更なる薄型・軽量化が要望されている。一方で、屋外での過酷な環境下での使用などといった使用環境も多様化してきており、従来以上に耐久性も求められてきている。このような状況から薄型で優れた光学特性を有する偏光膜が求められており、このような薄型偏光膜に適用可能な粘着剤層の開発も必要となる。
例えば、特開2010-44211号公報(特許文献1)は、高温環境下でも良好な耐久性を有する偏光膜の片面に粘着剤層を設けた偏光板を提供することを目的として、偏光膜の片面に、粘着剤層を構成する粘着剤の23℃における貯蔵弾性率(G’)が0.2~10MPaであり、かつ粘着剤層の厚みが2μm以上25μm未満である粘着剤層が設けられ、偏光膜の他面には透明樹脂フィルムからなる保護層が設けられた偏光板を開示している。
また薄型化を図ると、リワーク性が悪化するという問題も生じることが分かった。詳しくは偏光膜自体を薄くすると、光学フィルム全体の厚みが薄くなるため、リワーク時に偏光板の端部をつまみ上げることが難しくなるといった作業性の悪さや、偏光膜が破断しやすくなるなどの不具合が生じることが分かった。
上記した先行技術では、粘着耐久性やリワークに関する検討はなされているものの、偏光膜に粘着剤層が直接設けられた粘着剤層付偏光板において、粘着剤が偏光膜に及ぼす光学的な影響に関して、更には偏光膜自体を薄型化した場合の悪影響については、検討がなされておらず、その課題についても何ら開示がない。
本発明において、偏光膜の面に粘着剤層が「直接」設けられるとは、偏光膜と粘着剤層との間に何らの層も介在しない場合のほか、本発明の効果を損なわない範囲で、偏光膜と粘着剤層との間にアンカー層等の他の層が存在する場合をも含む。
粘着剤組成物について説明する。
粘着剤ポリマーとしては、一般的に粘着剤のベースポリマーとして用いられる、粘着性を有するポリマーであれば特に限定されないが、粘着性能のバランスが取りやすい理由から、Tgが0℃以下(通常-100℃以上)のポリマーが好適である。かかる粘着剤ポリマーのなかでも、ポリエステル系ポリマー、(メタ)アクリル系ポリマー等が好適に用いられる。
(メタ)アクリル系ポリマーは、通常、モノマー単位として、アルキル(メタ)アクリレートを主成分として含有する。なお、(メタ)アクリレートとは、アクリレートおよび/またはメタクリレートを意味するものであることとする。
ヒドロキシル基含有モノマーは、粘着剤ポリマーを構成する全モノマー成分中0.01~30重量%程度、好ましくは0.03~20重量%程度、さらに好ましくは0.05~10重量%程度の量で使用される。
さらに、本発明で使用する粘着剤組成物には、架橋剤を含有することできる。架橋剤としては、有機系架橋剤や多官能性金属キレートを用いることができる。有機系架橋剤としては、イソシアネート系架橋剤、過酸化物系架橋剤、エポキシ系架橋剤、イミン系架橋剤などが挙げられる。多官能性金属キレートは、多価金属が有機化合物と共有結合または配位結合しているものである。多価金属原子としては、Al、Cr、Zr、Co、Cu、Fe、Ni、V、Zn、In、Ca、Mg、Mn、Y、Ce、Sr、Ba、Mo、La、Sn、Ti等があげられる。共有結合または配位結合する有機化合物中の原子としては酸素原子等があげられ、有機化合物としてはアルキルエステル、アルコール化合物、カルボン酸化合物、エーテル化合物、ケトン化合物等が挙げられる。
[粘着剤層]
粘着剤層について説明する。
粘着剤層の厚さを薄くすることで、偏光膜に対する粘着剤中の酸の全体量が低下し、粘着剤層付偏光板の偏光度等の光学特性への影響を低減させることができる。
また、通常、粘着剤層厚みが薄くなると粘着力が低下していき、高温高湿下においては偏光膜の収縮に起因する偏光板の収縮応力によって、浮きや剥がれなどの粘着耐久性が低下する傾向にあり、粘着剤層の厚みを薄くすることは好ましくない。しかしながら、偏光膜を薄型化することで、偏光板の収縮応力を低減させることができ、その結果、粘着剤層厚みを薄くしても粘着耐久性を維持または向上させることができる。
[偏光膜]
偏光膜について説明する。
透明保護フィルムを構成する材料としては、透明性、機械的強度、熱安定性、水分遮断性、等方性などに優れる熱可塑性樹脂が用いられる。このような熱可塑性樹脂の具体例としては、トリアセチルセルロースなどのセルロース樹脂、ポリエステル樹脂、ポリエーテルスルホン樹脂、ポリスルホン樹脂、ポリカーボネート樹脂、ポリアミド樹脂、ポリイミド樹脂、ポリオレフィン樹脂、(メタ)アクリル樹脂、環状ポリオレフィン樹脂(ノルボルネン系樹脂)、ポリアリレート樹脂、ポリスチレン樹脂、ポリビニルアルコール樹脂、およびこれらの混合物が挙げられる。
[偏光膜の薄型化]
偏光膜の薄型化について説明する。
[薄型偏光膜の製法]
薄型偏光膜の製造方法について説明する。
更に具体的には、次のような方法により、薄型偏光膜を製造することができる。
上記の薄型偏光膜の製造方法は、上記工程以外に、その他の工程を含み得る。その他の工程としては、例えば、不溶化工程、架橋工程、乾燥(水分率の調節)工程等が挙げられる。その他の工程は、任意の適切なタイミングで行い得る。
上記不溶化工程は、代表的には、ホウ酸水溶液にPVA系樹脂層を浸漬させることにより行う。不溶化処理を施すことにより、PVA系樹脂層に耐水性を付与することができる。当該ホウ酸水溶液の濃度は、水100重量部に対して、好ましくは1重量部~4重量部である。不溶化浴(ホウ酸水溶液)の液温は、好ましくは20℃~50℃である。好ましくは、不溶化工程は、積層体作製後、染色工程や水中延伸工程の前に行う。
上記架橋工程は、代表的には、ホウ酸水溶液にPVA系樹脂層を浸漬させることにより行う。架橋処理を施すことにより、PVA系樹脂層に耐水性を付与することができる。当該ホウ酸水溶液の濃度は、水100重量部に対して、好ましくは1重量部~4重量部である。また、上記染色工程後に架橋工程を行う場合、さらに、ヨウ化物を配合することが好ましい。ヨウ化物を配合することにより、PVA系樹脂層に吸着させたヨウ素の溶出を抑制することができる。ヨウ化物の配合量は、水100重量部に対して、好ましくは1重量部~5重量部である。ヨウ化物の具体例は、上述のとおりである。架橋浴(ホウ酸水溶液)の液温は、好ましくは20℃~50℃である。好ましくは、架橋工程は上記第2のホウ酸水中延伸工程の前に行う。好ましい実施形態においては、染色工程、架橋工程および第2のホウ酸水中延伸工程をこの順で行う。
以下に、実施例を示して本発明についてさらに詳細に説明する。本発明はこれら実施例によって限定されるものではない。
<粘着剤ポリマーの調製>
冷却管、窒素導入管、温度計及び撹拌装置を備えた反応容器に、アクリル酸ブチル99部、アクリル酸4-ヒドロキシブチル1.0部、及び2、2-アゾビスイソブチロニトリルをモノマー(固形分)100部に対して0.3部を酢酸エチルと共に加えて窒素ガス気流下、60℃で4時間反応させた後、その反応液に酢酸エチルを加えて、粘着剤ポリマーを構成するモノマー中に酸成分を含まないアクリル系粘着剤ポリマーを含有する溶液を得た(固形分濃度30重量%)。
粘着剤ポリマーの重量平均分子量は、GPC(ゲル・パーミエーション・クロマトグラフィー)により測定した。
・分析装置:東ソー社製、HLC-8120GPC
・カラム:東ソー社製、G7000HXL+GMHXL+GMHXL
・カラムサイズ:各7.8mmφ×30cm 計90cm
・カラム温度:40℃
・流量:0.8ml/min
・注入量:100μl
・溶離液:テトラヒドロフラン
・検出器:示差屈折計(RI)
・標準試料:ポリスチレン
得られた溶液に含まれるアクリル系粘着剤ポリマーの重量平均分子量は、165万であった。
このアクリル系粘着剤ポリマー溶液の固形分100部あたり0.3部のジベンゾイルパーオキシド(日本油脂製(株):ナイパーBMT)と、0.1部のトリメチロールプロパンキシリレンジイソシアネート(三井武田ケミカル(株):タケネートD110N)と、0.2部のシランカップリング剤(綜研化学株式会社製:A-100、アセトアセチル基含有シランカップリング剤)を配合して、アクリル系粘着剤組成物(粘着剤A)を得た。
得られた溶液に含まれるアクリル系粘着剤ポリマーの重量平均分子量は、180万であった。
このアクリル系粘着剤ポリマー溶液を使用して、上記方法に従って、アクリル系粘着剤組成物(粘着剤B)を得た。
得られた溶液に含まれるアクリル系粘着剤ポリマーの重量平均分子量は、170万であった。
このアクリル系粘着剤ポリマー溶液を使用し、D110Nに代えてトリメチロールプロパントリレンジイソシアネート(日本ポリウレタン(株):コロネートL)を0.6部配合して、上記方法に従って、アクリル系粘着剤組成物(粘着剤C)を得た。
得られた溶液に含まれるアクリル系粘着剤ポリマーの重量平均分子量は、195万であった。
このアクリル系粘着剤ポリマー溶液を使用し、トリメチロールプロパントリレンジイソシアネートの配合量を0.45部としたことを除いて粘着剤Cの場合と同様の方法で、アクリル系粘着剤組成物(粘着剤D)を得た。
得られた溶液に含まれるアクリル系粘着剤ポリマーの重量平均分子量は、200万であった。
このアクリル系粘着剤ポリマー溶液を使用し、トリメチロールプロパントリレンジイソシアネートの配合量を0.4部としたことを除いて粘着剤Cの場合と同様の方法で、アクリル系粘着剤組成物(粘着剤E)を得た。
<偏光板の作製1>
厚さ80μmのポリビニルアルコールフィルムを、速度比の異なるロール間において、30℃、0.3%濃度のヨウ素溶液中で1分間染色しながら、3倍まで延伸した。その後、60℃、4%濃度のホウ酸、10%濃度のヨウ化カリウムを含む水溶液中に0.5分間浸漬しながら総合延伸倍率が6倍まで延伸した。次いで、30℃、1.5%濃度のヨウ化カリウムを含む水溶液中に10秒間浸漬することで洗浄した後、50℃で4分間乾燥を行い、厚さ25μmの偏光膜を得た。当該偏光膜の片面に、けん化処理した80μm厚のトリアセチルセルロースフィルムをポリビニルアルコール系接着剤により貼り合せて偏光板1を作成した。
薄型偏光膜を作製するため、まず、非晶性PET基材に24μm厚のPVA層が製膜された積層体を延伸温度130度の空中補助延伸によって延伸積層体を生成し、次に、延伸積層体を染色によって着色積層体を生成し、さらに着色積層体を延伸温度65度のホウ酸水中延伸によって総延伸倍率が5.94倍になるように非晶性PET基材と一体に延伸された10μm厚のPVA層を含む光学フィルム積層体を生成した。このような2段延伸によって非晶性PET基材に製膜されたPVA層のPVA分子が高次に配向され、染色によって吸着されたヨウ素がポリヨウ素イオン錯体として一方向に高次に配向された高機能偏光膜を構成する、厚さ10μmのPVA層を含む光学フィルム積層体を生成することができた。
更に、当該光学フィルム積層体の偏光膜の表面にポリビニルアルコール系接着剤を塗布しながら、けん化処理した80μm厚のトリアセチルセルロースフィルムを貼合せたのち、非晶性PET基材を剥離し、偏光板2を作製した。
積層体のPVA層の厚みを17μmとした以外は上記薄型偏光膜の作製方法と同様の方法により、厚さ7μmの偏光膜を含む偏光板3を得た。
積層体のPVA層の厚みを10μmとした以外は上記薄型偏光膜の作製方法と同様の方法により、厚さ4μmの偏光膜を含む偏光板4を得た。
実施例1
上記粘着剤Aを、シリコーン処理を施した、38μmのポリエチレンテレフタレート(PET)フィルム(三菱化学ポリエステルフィルム(株)製,MRF38)の片面に、乾燥後の粘着剤層の厚さが20μmになるように塗布し、155℃で1分間乾燥を行い、偏光板1に転写し、粘着剤層付偏光板を作製した。
表1に示すような粘着剤と偏光板との組み合わせを使用して、実施例1と同様の方法により、実施例2~10の粘着剤層付偏光板を作製した。
粘着剤Dと偏光板4を使用し、乾燥後の粘着剤層の厚さが5μmになるように塗布したことを除いて実施例1と同様の方法で、実施例11の粘着剤層付偏光板を作製した。
粘着剤Aに代えて粘着剤Eを使用したことを除いて実施例1と同様の方法で、比較例1の粘着剤層付偏光板を作製した。
同様に、表1に示すような粘着剤と偏光板との組み合わせを使用して、比較例2~4の粘着剤層付偏光板を作製した。
上記実施例1~11および比較例1~4で得られた粘着剤層付偏光板(サンプル)について、以下の評価を行った。評価結果を表1に示す。
更には、例えば実施例7~10を比較した結果から、酸成分の量を減らすことにより、薄型化を採用した偏光膜であっても、偏光度の低下を抑えた優れた偏光板を得ることができることが分かる。
薄型化を採用した偏光膜の場合で、良好な偏光度(ΔP<0.3程度となる)が得られるようにするためには、酸成分は8重量%未満、好ましくは6重量%以下とすべきであることが理解される。
また、実施例10と11を比較した結果から、同じ膜厚の偏光膜に対し粘着剤層の厚さを薄くすることによって、偏光膜に対する酸の全体量が低下し、偏光度の低下が抑えられるということが推察される。
本発明により得られる粘着剤層付偏光板が優れた粘着耐久性を有するものであることを確認することを目的として、酸成分の量が少ない粘着剤(粘着剤A)及び酸成分の量が比較的多い粘着剤(粘着剤D)を使用した実施例(上記実施例1~7及び10~11)で得られた粘着剤層付偏光板(サンプル)について、さらに以下の評価を行った。評価結果を表2に示す。
「★★★」:発泡、剥がれ、浮きなしなどの外観上の変化が全くない
「★★」:わずかながら端部に剥がれ、または発泡があるが、実用上問題なし
「★」:端部に剥がれ、または発泡があるが、特別な用途でなければ、実用上問題なし
「★なし」:端部に著しい剥がれ、または発泡があり、実用上問題あり
また、薄型の偏光膜を使用して得られる粘着剤層付偏光板は、偏光度のような光学特性ばかりでなく、耐久性の点でも非常に優れていることが理解される。
粘着剤ポリマーを構成する全モノマー成分中の酸成分の量の、粘着剤層付偏光板のリワーク性に対する影響を評価することを目的として、上記実施例1~6及び比較例1~3で得られた粘着剤層付偏光板(サンプル)について、さらに以下の評価を行った。評価結果を表3に示す。
◎:サンプルの破断がなく良好に剥離可能であった
○:若干サンプルの破断が起こったが良好に剥離可能であった
△:サンプルが破断したが、再度の剥離によって剥がすことができた
×:サンプルが破断し、再度の剥離によっても剥がすことはできなかった
Claims (9)
- 偏光膜の少なくとも片面に粘着剤層が直接設けられており、該粘着剤層は粘着剤ポリマーを含む粘着剤組成物からなり、該粘着剤ポリマーを構成する全モノマー成分中の酸成分の量が8重量%未満であることを特徴とする粘着剤層付偏光板。
- 前記偏光膜の厚さが10μm以下であることを特徴とする請求項1に記載の粘着剤層付偏光板。
- 前記偏光膜の厚さが7μm以下であることを特徴とする請求項2に記載の粘着剤層付偏光板。
- 前記酸成分の量が0~6重量%であることを特徴とする請求項1~3のいずれか1項に記載の粘着剤層付偏光板。
- 前記粘着剤ポリマーが酸成分を実質的に含まないことを特徴とする請求項1~4のいずれか1項に記載の粘着剤層付偏光板。
- 前記粘着剤層が前記偏光膜の片面のみに設けられていることを特徴とする請求項1~5のいずれか1項に記載の粘着剤層付偏光板。
- 前記粘着剤層の厚さが1~35μmであることを特徴とする請求項1~6のいずれか1項に記載の粘着剤層付偏光板。
- 前記粘着剤ポリマーがアクリル系ポリマー又はメタアクリル系ポリマーであることを特徴とする請求項1~7のいずれか1項に記載の粘着剤層付偏光板。
- 請求項1~8のいずれか1項に記載の粘着剤層付偏光板を少なくとも1つ用いたことを特徴とする画像表示装置。
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JP6644971B2 (ja) * | 2014-08-06 | 2020-02-12 | 藤森工業株式会社 | 粘着剤層及び粘着フィルム |
CN104199574A (zh) * | 2014-08-28 | 2014-12-10 | 京东方科技集团股份有限公司 | 一种一体片、其制作方法及采用其制作触摸屏的方法 |
JP6486859B2 (ja) * | 2016-03-29 | 2019-03-20 | 日東電工株式会社 | 偏光フィルムおよび画像表示装置 |
TWI712496B (zh) * | 2016-08-22 | 2020-12-11 | 日商可樂麗股份有限公司 | 偏光板 |
JP2018092134A (ja) * | 2016-08-31 | 2018-06-14 | 日本合成化学工業株式会社 | 偏光板用粘着剤組成物、偏光板用粘着剤、粘着剤層付偏光板並びに離型フィルム及び粘着剤層付偏光板 |
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JP7240091B2 (ja) * | 2017-10-03 | 2023-03-15 | 日東電工株式会社 | 偏光板、画像表示装置、および偏光板の製造方法 |
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TW201303393A (zh) | 2013-01-16 |
US9429695B2 (en) | 2016-08-30 |
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CN103703395A (zh) | 2014-04-02 |
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KR20190031336A (ko) | 2019-03-25 |
TW201719205A (zh) | 2017-06-01 |
KR102457663B1 (ko) | 2022-10-24 |
US20140111858A1 (en) | 2014-04-24 |
JP5572589B2 (ja) | 2014-08-13 |
JP2012247517A (ja) | 2012-12-13 |
TWI570453B (zh) | 2017-02-11 |
TWI589940B (zh) | 2017-07-01 |
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