WO2023243655A1 - Polarizing plate and display device using same - Google Patents
Polarizing plate and display device using same Download PDFInfo
- Publication number
- WO2023243655A1 WO2023243655A1 PCT/JP2023/022054 JP2023022054W WO2023243655A1 WO 2023243655 A1 WO2023243655 A1 WO 2023243655A1 JP 2023022054 W JP2023022054 W JP 2023022054W WO 2023243655 A1 WO2023243655 A1 WO 2023243655A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- meth
- acrylate
- protective film
- polarizing plate
- film
- Prior art date
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- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 230000001588 bifunctional effect Effects 0.000 description 1
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 1
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- LMGZGXSXHCMSAA-UHFFFAOYSA-N cyclodecane Chemical group C1CCCCCCCCC1 LMGZGXSXHCMSAA-UHFFFAOYSA-N 0.000 description 1
- SYEPGZUBYZSFTQ-UHFFFAOYSA-N cyclohexane;methanol Chemical compound OC.OC.OC.C1CCCCC1 SYEPGZUBYZSFTQ-UHFFFAOYSA-N 0.000 description 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- VFHVQBAGLAREND-UHFFFAOYSA-N diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 VFHVQBAGLAREND-UHFFFAOYSA-N 0.000 description 1
- 125000003438 dodecyl group Chemical group [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])* 0.000 description 1
- ODQWQRRAPPTVAG-GZTJUZNOSA-N doxepin Chemical compound C1OC2=CC=CC=C2C(=C/CCN(C)C)/C2=CC=CC=C21 ODQWQRRAPPTVAG-GZTJUZNOSA-N 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- HLBOJHQDGVDWPU-UHFFFAOYSA-N ethyl carbamate;[2-(hydroxymethyl)-3-prop-2-enoyloxy-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate;5-isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane Chemical compound CCOC(N)=O.CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1.C=CC(=O)OCC(CO)(COC(=O)C=C)COC(=O)C=C HLBOJHQDGVDWPU-UHFFFAOYSA-N 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- MNWFXJYAOYHMED-UHFFFAOYSA-M heptanoate Chemical compound CCCCCCC([O-])=O MNWFXJYAOYHMED-UHFFFAOYSA-M 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 229940051250 hexylene glycol Drugs 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229940057867 methyl lactate Drugs 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- FVXBCDWMKCEPCL-UHFFFAOYSA-N nonane-1,1-diol Chemical compound CCCCCCCCC(O)O FVXBCDWMKCEPCL-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 125000000913 palmityl 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])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 239000003504 photosensitizing agent Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-M phthalate(1-) Chemical compound OC(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-M 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 125000004079 stearyl 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])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- MUTNCGKQJGXKEM-UHFFFAOYSA-N tamibarotene Chemical compound C=1C=C2C(C)(C)CCC(C)(C)C2=CC=1NC(=O)C1=CC=C(C(O)=O)C=C1 MUTNCGKQJGXKEM-UHFFFAOYSA-N 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
- 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
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
Definitions
- the present invention relates to a polarizing plate and a display device using the same.
- Polyvinyl alcohol is mainly used for polarizing plates used in display devices. Since PVA has extremely poor water resistance, protective films are attached to both sides. Conventionally, a hard coat film with a moisture permeability of about 300 to 1000 g/m 2 /day, which is a triacetyl cellulose (TAC) film laminated with a hard coat layer, has been used as a protective film for a polarizing plate. Under harsh humid conditions, the problem was that PVA could not be completely prevented from absorbing water, causing deterioration.
- TAC triacetyl cellulose
- an object of the present invention is to provide a polarizing plate that is thin and highly flexible, yet has durability in high temperature and high humidity environments, and a display device using the same.
- the polarizing plate according to the present invention has a protective film A attached to one side of a polarizer and a protective film B attached to the other side, and the water vapor permeability TA of the protective film A at 40° C. and 90% RH.
- the moisture permeability TB of the protective film B satisfies the following conditions (1) and (2) at the same time, and the protective film A contains a (meth)acrylate compound (A), a (meth)acrylate compound (B) containing an alicyclic structure, and a ), has a hard coat layer consisting of a cured film of a composition containing a photopolymerization initiator (C) and in which the content of a (meth)acrylate compound (B) is 20% by mass or more based on the total solids, and has a protective layer.
- a polarizing plate characterized in that the thickness of film A is less than 50 ⁇ m. 240g/m 2 /day>TA>70g/m 2 /day...(1)
- a display device includes the above polarizing plate.
- a polarizing plate that is thin and highly flexible, yet has durability in high temperature and high humidity environments, and a display device using the same.
- FIG. 1 is a sectional view showing a schematic configuration of a polarizing plate according to an embodiment.
- the polarizing plate 10 includes a polarizer 1, a protective film A attached to one side of the polarizer 1, and a protective film B attached to the other side of the polarizer 1.
- the polarizer 1 is formed by adsorbing iodine or dye to a polyvinyl alcohol (PVA) film and orienting the film. Since PVA constituting the polarizer 1 has poor strength and water resistance, protective films A and B are bonded to both sides of the polarizer 1.
- the protective film A is a hard coat film in which a hard coat layer 3 is laminated on one side of a TAC film 2.
- the hard coat layer 3 is a functional layer that covers the flexible TAC film 2 and provides hardness to the protective film A.
- the hard coat layer 3 is formed by applying a composition containing a (meth)acrylate compound containing an alicyclic structure and a photopolymerization initiator to one surface of the TAC film 2, drying it, and curing the coating film by UV irradiation.
- a composition containing a (meth)acrylate compound containing an alicyclic structure and a photopolymerization initiator can be formed by
- (meth)acrylate is a generic term for both acrylate and methacrylate
- (meth)acryloyl is a generic term for both acryloyl and methacryloyl.
- the (meth)acrylate containing an alicyclic structure increases the hydrophobicity of the hard coat layer 3, imparts water vapor barrier properties to the protective film A, and improves the bending resistance of the hard coat layer 3.
- the (meth)acrylate containing an alicyclic structure is not particularly limited, but has, for example, one or more of a cyclopentane structure, a dicyclopentane structure, a cyclohexane structure, a cyclodecane structure, a tricyclodecane structure, an isobornyl structure, and an adamantane structure ( (meth)acrylates can be used.
- (meth)acrylates containing an alicyclic structure include cyclohexyl (meth)acrylate, cyclohexanedimethanol mono(meth)acrylate, 4-tert-butylcyclohexyl (meth)acrylate, and 3,3,5-trimethylcyclohexyl ( meth)acrylate, 3,3,5-trimethylcyclohexanol (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentadienyl (meth)acrylate, 2-dicyclopene tenoxyethyl (meth)acrylate, dicyclopentenyloxyethyl methacrylate, bornyl (meth)acrylate, isobornyl (meth)acrylate, tricyclodecanyl (meth)acrylate, tricyclodecane dimethanol mono(meth)acrylate, adamantyl (meth)acrylate )
- the blending ratio of the (meth)acrylate containing an alicyclic structure is preferably 20% by mass or more of the total solid content of the composition for forming a hard coat layer.
- the moisture permeability of the protective film A can be within the range described below, and the bending resistance of the hard coat layer 3 can be improved. can improve sex.
- the upper limit of the blending ratio of (meth)acrylate containing an alicyclic structure is not particularly limited, but since a photopolymerization initiator is added, it is 99% by mass or less of the total solid content.
- active energy ray-curable compounds may be used.
- active energy ray-curable compound for example, monofunctional, bifunctional, or trifunctional or more functional (meth)acrylate monomers can be used.
- Examples of monofunctional (meth)acrylate compounds include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, n-butyl (meth)acrylate, and isobutyl (meth)acrylate.
- difunctional (meth)acrylates include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, butanediol di(meth)acrylate, hexanediol di(meth)acrylate, and nonanediol di(meth)acrylate.
- ethoxylated hexanediol di(meth)acrylate, propoxylated hexanediol di(meth)acrylate diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, ) acrylate, neopentyl glycol di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, di(meth)acrylate such as neopentyl glycol hydroxypivalate di(meth)acrylate Examples include acrylate.
- trifunctional or higher functional (meth)acrylates examples include trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, and tris-2-hydroxyethyl isocyanate.
- Trifunctional tri(meth)acrylates such as nurate tri(meth)acrylate, glycerin tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, and ditrimethylolpropane tri(meth)acrylate (meth)acrylate compounds, pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ditrimethylolpropane penta(meth)acrylate Acrylate, dipentaerythritol hexa(meth)acrylate, ditrimethylolpropane hexa(meth)acrylate, and other polyfunctional (meth)acrylate compounds with three or more functionalities, or some of these (me
- urethane (meth)acrylate can also be used as a polyfunctional monomer.
- examples of urethane (meth)acrylate include those obtained by reacting a (meth)acrylate monomer having a hydroxyl group with a product obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer. .
- urethane (meth)acrylates examples include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate Examples include urethane prepolymer, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymer.
- the above-mentioned polyfunctional monomers may be used alone or in combination of two or more. Further, the above-mentioned polyfunctional monomer may be a monomer in the composition, or may be a partially polymerized oligomer.
- a polymerization initiator that generates radicals upon irradiation with ultraviolet rays can be used.
- radical polymerization initiators such as acetophenone, benzophenone, thioxanthone, benzoin, benzoin methyl ether, and acylphosphine oxide can be used.
- a polymerization initiator for example, diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, 2,2-diethoxyacetophenone, 1-hydroxycyclohexylphenyl ketone , 2,2-dimethoxy-phenylacetophenone, dibenzoyl, benzoin, benzoin methyl ether, benzoin ethyl ether, p-chlorobenzophenone, p-methoxybenzophenone, Michler's ketone, acetophenone, 2-chlorothioxanthone, and the like.
- diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide
- 2,2-diethoxyacetophenone 1-hydroxycyclohexylphenyl ketone
- a solvent may be added to the composition for forming a hard coat layer, if necessary.
- solvents include alcohols such as methanol, ethanol, 1-propanol, 2-propanol, butanol, isopropyl alcohol, and isobutanol, ketones such as acetone, methyl ethyl ketone, cyclohexanone, and methyl isobutyl ketone, and ketone alcohols such as diacetone alcohol.
- aromatic hydrocarbons such as benzene, toluene, xylene, glycols such as ethylene glycol, propylene glycol, hexylene glycol, ethyl cellosolve, butyl cellosolve, ethyl carbitol, butyl carbitol, diethyl cellosolve, diethyl carbitol, propylene glycol Glycol ethers such as monomethyl ether, esters such as dimethyl carbonate, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate, butyl acetate, amyl acetate, ethers such as dimethyl ether, diethyl ether, N-methylpyrrolidone, dimethylformamide Among them, one type or a mixture of two or more types can be used.
- glycols such as ethylene glycol, propylene glycol, hexylene glycol, ethyl cellosolve,
- the composition for forming a hard coat layer includes an antistatic agent, an antifoaming agent, an antioxidant, an ultraviolet absorber, an infrared absorber, a coloring material, a light stabilizer, a polymerization inhibitor, a photosensitizer, and an antifouling agent.
- an antistatic agent such as an agent, a leveling agent, an oil repellent, a water repellent, an anti-fingerprint agent, etc. may be added as necessary.
- the coating method of the composition for forming a hard coat layer is not particularly limited, and examples thereof include a spin coater, roll coater, reverse roll coater, gravure coater, microgravure coater, knife coater, bar coater, wire bar coater, die coater, and dip coater. Coating can be performed using a coater, spray coater, applicator, etc.
- the thickness (total thickness) of the protective film A is preferably less than 50 ⁇ m.
- the thickness of the protective film A is 50 ⁇ m or more, cracks are likely to occur in the hard coat layer 3 when the polarizing plate 10 is bent.
- the pencil hardness of the protective film A is preferably 3H or higher.
- the pencil hardness of the protective film A is 3H or more, the surface hardness of the polarizing plate is good and the durability is improved.
- the thickness of the TAC film 2 and the hard coat layer 3 used in the protective film A are not particularly limited as long as the layer thickness of the protective film A is 50 ⁇ m, but as an example, the thickness of the TAC film 2 is 25 to 40 ⁇ m.
- the thickness of the hard coat layer 3 is 5 to 10 ⁇ m.
- the protective film B is a low moisture permeable film made of cycloolefin polymer (COP), polyethylene terephthalate (PET), or polymethyl methacrylate (PMMA).
- COP cycloolefin polymer
- PET polyethylene terephthalate
- PMMA polymethyl methacrylate
- the protective film B is bonded to the polarizer 1 via, for example, an ultraviolet curable adhesive.
- the thickness of the protective film B is not particularly limited, but is preferably 10 to 100 ⁇ m.
- the protective film B is placed on the display panel side, and the hard coat layer of the protective film A is placed on the viewing side (opposite side to the display panel).
- the TAC film of the protective film A is bonded to the PVA film of the polarizer 1 using water glue (PVA aqueous solution) as an adhesive.
- water glue PVA aqueous solution
- the protective film A is saponified before lamination. Since water glue is used to attach the protective film A to the polarizer 1, water may be contained in the adhesive layer and the TAC film even after the drying process. If both protective films A and B are made of films with low moisture permeability, the intrusion of moisture from the outside will be suppressed, but adhesive and/or TAC Moisture contained in the film continues to remain in the polarizing plate 10, causing deterioration of the polarizer 1.
- the polarizing plate 10 according to the present embodiment, a difference is provided between the water vapor permeability of the protective film A and the water vapor permeability of the protective film B, and the water vapor permeability of the protective film A and the protective film B is set within a specific range. By doing so, deterioration of the polarizer 1 due to moisture derived from the adhesive and/or the TAC film is suppressed.
- the moisture permeability of the protective films A and B at 40° C. and 90% RH is TA and TB, respectively, TA and TB satisfy the following conditions (1) and (2) at the same time.
- the moisture permeability TA and TB are both values measured in accordance with the moisture permeability test method (cup method) for moisture-proof packaging materials specified in JIS Z 0208:1976. 240g/m 2 /day>TA>70g/m 2 /day...(1) 70g/m 2 /day ⁇ TB...(2)
- the polarizing plate 10 according to the present embodiment can be used in a high-temperature environment of, for example, 85° C. while suppressing the intrusion of moisture from the outside into the inside of the polarizing plate.
- moisture generated from the adhesive used to bond the protective film A and the polarizer 1 and/or the TAC film of the protective film A can be discharged to the outside.
- the polarizing plate 10 includes the protective film A and the protective film B that satisfy the above conditions (1) and (2).
- the protective film B disposed on the display panel side substantially blocks moisture from entering and exiting.
- the protective film A disposed on the viewing side suppresses the intrusion of moisture from the outside into the inside of the polarizing plate 10 and allows the moisture generated inside the polarizing plate 10 to be released in an extremely high temperature environment. . Therefore, when the polarizing plate 10 according to the present embodiment is used in a high-temperature environment, the moisture generated inside the polarizing plate 10 does not remain, so deterioration of the polarizer is suppressed and the polarizer can be used for a longer period of time. It becomes possible to maintain the optical performance of the polarizing plate 10.
- the thickness of the protective film A is less than 50 ⁇ m, it is possible to make the polarizing plate 10 thinner, and it also suppresses the occurrence of cracks in the hard coat layer 3 when the polarizing plate 10 is bent, thereby improving the bending resistance. You can improve.
- a polarizing plate 10 that is thin and highly flexible, yet has durability in a high temperature and high humidity environment.
- the polarizing plate 10 according to this embodiment can be used to configure an image display device in combination with an image display panel such as a liquid crystal panel or an organic EL panel.
- the image display device may include a touch panel. Since the polarizing plate 10 according to the present embodiment has both high flexibility and durability in high temperature and high humidity environments, it can be suitably used as an image display device provided on a curved surface inside a car.
- a composition for forming a hard coat layer containing a polymerizable material, a hydrophobic material, a photopolymerization initiator, and a solvent in the proportions shown in Table 1 was prepared.
- the proportion of dihydrocyclopentadiethyl acrylate in the total solid content of the composition for forming a hard coat layer is as follows. ⁇ Composition 1:18% ⁇ Composition 2: 45% ⁇ Composition 3: 90% ⁇ Composition 4: 9% ⁇ Composition 5: 0%
- the prepared composition for forming a hard coat layer was applied to a 40 ⁇ m thick TAC film (product name: TJ25 manufactured by Fujifilm) using a wire bar coater so that the film thickness after curing would be the value shown in Table 2. did. After drying the coating film by heating it in an oven at 60°C for 1 minute, it was irradiated with ultraviolet rays in a UV curing device under a nitrogen atmosphere (oxygen concentration 500 ppm or less) so that the cumulative light amount was 100 mJ/cm 2 . The film was cured to produce a protective film A (hard coat film). Moreover, a COP film with a thickness of 26 ⁇ m was used as a protective film B.
- moisture permeability The moisture permeability TA of the protective film A and the moisture permeability TB of the protective film B before being laminated to the polarizer were determined in accordance with the moisture permeability test method for moisture-proof packaging materials (cup method) specified in JIS Z 0208:1976. , 40°C and 90RH%.
- Table 2 shows various properties of the protective films A and B according to each Example and each Comparative Example, and measured values of the degree of polarization of the polarizing plate (initial value, before and after the high temperature and high humidity durability test).
- the polarizing plates according to Examples 1 to 7 satisfy the above conditions (1) and (2), the water vapor permeability TA of the protective film A and the water vapor permeability TB of the protective film B satisfy the above conditions (1) and (2). Even after being placed in a constant temperature bath for 500 hours, it showed a high degree of polarization. Moreover, since the layer thickness of the protective film A was less than 50 ⁇ m, even when it was wound around a mandrel with a diameter of 2 mm, no cracks were generated on the surface of the hard coat layer, and the bending resistance was excellent. Moreover, since the protective film A had a hard coat layer, the surface hardness was also excellent compared to Comparative Examples 12 and 13, which did not have a hard coat layer.
- Comparative Example 1 since the layer thickness of the protective film A is 50 ⁇ m, cracks occur on the surface of the hard coat layer when it is wound around a 2 mm mandrel. The bending resistance was poor.
- the polarizing plate according to Comparative Example 2 was unable to sufficiently suppress the intrusion of moisture from the outside due to the high moisture permeability TA of the protective film A, and after being placed in a constant temperature bath at 85° C. and 85% RH for 500 hours.
- the degree of polarization of the sample was lower than that of the example.
- the polarizing plates according to Comparative Examples 3 to 6 did not have sufficient bending resistance due to the small number of structural units derived from (meth)acrylate having an alicyclic structure in the hard coat layer of the protective film A.
- the bending resistance of the protective film A was inferior to that of the example. It should be noted that the reason why the protective film A of Comparative Example 2, in which the hard coat layer was formed with the same composition as Comparative Examples 3 to 6, exhibited the same bending resistance as that of the example was due to the layer thickness of the protective film A of Comparative Example 2. This is thought to be because the hard coat layer was relatively thin and stress concentration on the surface of the hard coat layer was suppressed.
- the polarizing plates according to Comparative Examples 7 to 9 were unable to sufficiently suppress the intrusion of moisture from the outside due to the high moisture permeability TA of the protective film A, and were placed in a constant temperature bath at 85° C. and 85% RH for 500 hours. The degree of polarization after the test was lower than that of the example.
- the polarizing plates according to Comparative Examples 8 and 9 did not have sufficient bending resistance because the hard coat layer of the protective film A did not contain a (meth)acrylate-derived structural unit having an alicyclic structure. This did not occur, and the bending resistance of the protective film A was inferior to that of the examples.
- the polarizing plates according to Comparative Examples 10 and 11 did not have sufficient bending resistance because the hard coat layer of the protective film A did not contain a (meth)acrylate-derived structural unit having an alicyclic structure.
- the bending resistance of the protective film A was inferior to that of the examples.
- the degree of polarization of the polarizing plates according to Comparative Examples 12 and 13 after being placed in a constant temperature bath at 85° C. and 85% RH for 500 hours was lower than that of the example. This is because the moisture permeability TA of the protective film A is too low, so when exposed to high temperature and high humidity, the moisture contained in the protective film A and/or the adhesive (water paste) enters the polarizing plate. It is thought that the polarizer continued to remain there, and as a result, the polarizer deteriorated. Moreover, since the protective films A of Comparative Examples 12 and 13 were not provided with a hard coat layer, the surface hardness was inferior to that of the Examples.
- the present invention can be used as a polarizing plate for display devices, and is particularly suitable as a polarizing plate for display devices used in high-temperature environments such as in-vehicle applications.
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Abstract
The present invention provides: a polarizing plate that has durability in high-temperature and high-humidity environments while also being a thin film with high flexibility; and a display device using the polarizing plate. Provided is a polarizing plate in which a protective film A is affixed to one surface of a polarizer and a protective film B is affixed to the other surface of the polarizer, said polarizing plate being characterized in that: the moisture permeability TA of the protective film A and the moisture permeability TB of the protective film B at 40°C and 90% RH satisfy conditions (1) and (2) simultaneously; the protective film A has a hardcoat layer comprising a cured film of a composition which contains a photopolymerization initiator and a (meth)acrylate compound which includes an alicyclic structure, and in which the content ratio of the (meth)acrylate compound including the alicyclic structure is not less than 20 mass% of the entire solid content; and the thickness of the protective film A is less than 50 μm. (1): 240g/m2/day>TA>70g/m2/day. (2): 70g/m2/day≥TB.
Description
本発明は、偏光板及びこれを用いた表示装置に関する。
The present invention relates to a polarizing plate and a display device using the same.
表示装置に用いられる偏光板には、主にポリビニルアルコール（ＰＶＡ）が使用されている。ＰＶＡは耐水性が極めて悪いため、両面に保護フィルムが貼り合わされる。偏光板の保護フィルムには、従来、トリアセチルセルロース（ＴＡＣ）フィルムにハードコート層を積層した、透湿度が３００～１０００ｇ／ｍ２／ｄａｙ程度のハードコートフィルムが使用されてきたが、高温高湿の過酷条件下では、ＰＶＡの吸水を防ぎきれずに劣化を引き起こすという問題であった。
Polyvinyl alcohol (PVA) is mainly used for polarizing plates used in display devices. Since PVA has extremely poor water resistance, protective films are attached to both sides. Conventionally, a hard coat film with a moisture permeability of about 300 to 1000 g/m 2 /day, which is a triacetyl cellulose (TAC) film laminated with a hard coat layer, has been used as a protective film for a polarizing plate. Under harsh humid conditions, the problem was that PVA could not be completely prevented from absorbing water, causing deterioration.
そこで、ＴＡＣに代えて、シクロオレフィンポリマー（ＣＯＰ）や、ポリエチレンテレフタレート（ＰＥＴ）を用いた保護フィルムの開発が進められ、保護フィルムの透湿度は、５～１００ｇ／ｍ２／ｄａｙ程度まで低減されてきた。
Therefore, instead of TAC, protective films using cycloolefin polymer (COP) and polyethylene terephthalate (PET) are being developed, and the moisture permeability of the protective film has been reduced to about 5 to 100 g/m 2 /day. It's here.
近年、車載用途などで、極めて高い温湿度での耐久性を有する偏光板が求められている。高温湿度環境下において、保護フィルムの水蒸気バリア性が高すぎると、外部からの水分の侵入はないものの、基材や、保護フィルムの貼り合わせに用いた粘着剤から発生した水分が、偏光板中に留まり劣化を引き起こすという事例が観測されている。
In recent years, there has been a demand for polarizing plates that can withstand extremely high temperatures and humidity for automotive applications and the like. In a high temperature and humidity environment, if the water vapor barrier properties of the protective film are too high, moisture will not infiltrate from the outside, but moisture generated from the base material and the adhesive used to bond the protective film will leak onto the polarizing plate. Cases have been observed in which the particles remain inside and cause deterioration.
また、車載用ディスプレイの面積が拡大していると共に、使用用途も拡張されており、平面部だけでなく、曲面部にもディスプレイが採用されるケースも生じている。こういった背景から、偏光板の薄型化・高屈曲性が求められている。
In addition, the area of in-vehicle displays is expanding, and the applications for which they are used are also expanding, and there are cases where displays are being used not only on flat surfaces but also on curved surfaces. Against this background, there is a demand for thinner polarizing plates and higher flexibility.
それ故に、本発明は、薄膜かつ高屈曲でありながら、高温高湿環境における耐久性を備えた偏光板及びこれを用いた表示装置を提供することを目的とする。
Therefore, an object of the present invention is to provide a polarizing plate that is thin and highly flexible, yet has durability in high temperature and high humidity environments, and a display device using the same.
本発明に係る偏光板は、偏光子の一方面に保護フィルムＡが貼り合わされ、他方面に保護フィルムＢが貼り合わされたものであって、４０℃９０％ＲＨにおける保護フィルムＡの透湿度ＴＡ及び保護フィルムＢの透湿度ＴＢが以下の条件（１）及び（２）を同時に満足し、保護フィルムＡが、（メタ）アクリレート化合物（Ａ）、脂環式構造を含む（メタ）アクリレート化合物（Ｂ）、光重合開始剤（Ｃ）を含有し、（メタ）アクリレート化合物（Ｂ）の含有割合が全固形分の２０質量％以上である組成物の硬化膜からなるハードコート層を有し、保護フィルムＡの厚みが５０μｍ未満であることを特徴とする、偏光板。
２４０ｇ／ｍ２／ｄａｙ＞ＴＡ＞７０ｇ／ｍ２／ｄａｙ ・・・（１）
７０ｇ／ｍ２／ｄａｙ≧ＴＢ ・・・（２） The polarizing plate according to the present invention has a protective film A attached to one side of a polarizer and a protective film B attached to the other side, and the water vapor permeability TA of the protective film A at 40° C. and 90% RH. The moisture permeability TB of the protective film B satisfies the following conditions (1) and (2) at the same time, and the protective film A contains a (meth)acrylate compound (A), a (meth)acrylate compound (B) containing an alicyclic structure, and a ), has a hard coat layer consisting of a cured film of a composition containing a photopolymerization initiator (C) and in which the content of a (meth)acrylate compound (B) is 20% by mass or more based on the total solids, and has a protective layer. A polarizing plate, characterized in that the thickness of film A is less than 50 μm.
240g/m 2 /day>TA>70g/m 2 /day...(1)
70g/m 2 /day≧TB...(2)
２４０ｇ／ｍ２／ｄａｙ＞ＴＡ＞７０ｇ／ｍ２／ｄａｙ ・・・（１）
７０ｇ／ｍ２／ｄａｙ≧ＴＢ ・・・（２） The polarizing plate according to the present invention has a protective film A attached to one side of a polarizer and a protective film B attached to the other side, and the water vapor permeability TA of the protective film A at 40° C. and 90% RH. The moisture permeability TB of the protective film B satisfies the following conditions (1) and (2) at the same time, and the protective film A contains a (meth)acrylate compound (A), a (meth)acrylate compound (B) containing an alicyclic structure, and a ), has a hard coat layer consisting of a cured film of a composition containing a photopolymerization initiator (C) and in which the content of a (meth)acrylate compound (B) is 20% by mass or more based on the total solids, and has a protective layer. A polarizing plate, characterized in that the thickness of film A is less than 50 μm.
240g/m 2 /day>TA>70g/m 2 /day...(1)
70g/m 2 /day≧TB...(2)
また、本発明に係る表示装置は、上記の偏光板を備えるものである。
Furthermore, a display device according to the present invention includes the above polarizing plate.
本発明によれば、薄膜かつ高屈曲でありながら、高温高湿環境における耐久性を備えた偏光板及びこれを用いた表示装置を提供できる。
According to the present invention, it is possible to provide a polarizing plate that is thin and highly flexible, yet has durability in high temperature and high humidity environments, and a display device using the same.
偏光板１０は、偏光子１と、偏光子１の一方面側に貼り合わされる保護フィルムＡと、偏光子１の他方面側に貼り合わされる保護フィルムＢとを備える。偏光子１は、ポリビニルアルコール（ＰＶＡ）フィルムにヨウ素または染料を吸着させ配向させることによって形成されたものである。偏光子１を構成するＰＶＡは、強度及び耐水性に劣るため、偏光子１の両面に保護フィルムＡ及びＢが貼り合わされる。
The polarizing plate 10 includes a polarizer 1, a protective film A attached to one side of the polarizer 1, and a protective film B attached to the other side of the polarizer 1. The polarizer 1 is formed by adsorbing iodine or dye to a polyvinyl alcohol (PVA) film and orienting the film. Since PVA constituting the polarizer 1 has poor strength and water resistance, protective films A and B are bonded to both sides of the polarizer 1.
保護フィルムＡは、ＴＡＣフィルム２の一面にハードコート層３が積層されたハードコートフィルムである。ハードコート層３は、柔軟なＴＡＣフィルム２を覆い、保護フィルムＡに硬度を付与する機能層である。
The protective film A is a hard coat film in which a hard coat layer 3 is laminated on one side of a TAC film 2. The hard coat layer 3 is a functional layer that covers the flexible TAC film 2 and provides hardness to the protective film A.
ハードコート層３は、脂環式構造を含む（メタ）アクリレート化合物と光重合開始剤とを含有する組成物をＴＡＣフィルム２の一面に塗布して乾燥させ、紫外線照射により塗膜を硬化させることによって形成することができる。尚、本明細書において、「（メタ）アクリレート」は、アクリレートとメタクリレートの両方の総称であり、「（メタ）アクリロイル」は、アクリロイルとメタクリロイルの両方の総称である。
The hard coat layer 3 is formed by applying a composition containing a (meth)acrylate compound containing an alicyclic structure and a photopolymerization initiator to one surface of the TAC film 2, drying it, and curing the coating film by UV irradiation. can be formed by In this specification, "(meth)acrylate" is a generic term for both acrylate and methacrylate, and "(meth)acryloyl" is a generic term for both acryloyl and methacryloyl.
脂環式構造を含む（メタ）アクリレートは、ハードコート層３の疎水性を高め、保護フィルムＡに水蒸気バリア性を付与すると共に、ハードコート層３の耐屈曲性を向上させる。脂環式構造を含む（メタ）アクリレートは特に限定されないが、例えば、シクロペンタン構造、ジシクロペンタン構造、シクロヘキサン構造、シクロデカン構造、トリシクロデカン構造、イソボルニル構造、アダマンタン構造の１種以上を有する（メタ）アクリレートを使用することができる。
The (meth)acrylate containing an alicyclic structure increases the hydrophobicity of the hard coat layer 3, imparts water vapor barrier properties to the protective film A, and improves the bending resistance of the hard coat layer 3. The (meth)acrylate containing an alicyclic structure is not particularly limited, but has, for example, one or more of a cyclopentane structure, a dicyclopentane structure, a cyclohexane structure, a cyclodecane structure, a tricyclodecane structure, an isobornyl structure, and an adamantane structure ( (meth)acrylates can be used.
脂環式構造を含む（メタ）アクリレートの具体例として、シクロヘキシル（メタ）アクリレート、シクロヘキサンジメタノールモノ（メタ）アクリレート、４－ｔｅｒｔ－ブチルシクロヘキシル（メタ）アクリレート、３，３，５－トリメチルシクロヘキシル（メタ）アクリレート、３，３，５－トリメチルシクロヘキサノール（メタ）アクリレート、ジシクロペンタニル（メタ）アクリレート、ジシクロペンテニル（メタ）アクリレート、ジシクロペンタジエニル（メタ）アクリレート、２－ジシクロペンテノキシエチル（メタ）アクリレート、ジシクロペンテニルオキシエチルメタクリレート、ボルニル（メタ）アクリレート、イソボルニル（メタ）アクリレート、トリシクロデカニル（メタ）アクリレート、トリシクロデカンジメタノールモノ（メタ）アクリレート、アダマンチル（メタ）アクリレート等の単官能（メタ）アクリレートや、シクロヘキサンジメタノールジ（メタ）アクリレート、ジシクロペンタニルジ（メタ）アクリレート、ジシクロペンテニルジ（メタ）アクリレート、ジシクロペンタジエニルジ（メタ）アクリレート、ボルニルジ（メタ）アクリレート、イソボルニルジ（メタ）アクリレート、トリシクロデカニルジ（メタ）アクリレート、トリシクロデカンジメタノールジ（メタ）アクリレート、アダマンチルジ（メタ）アクリレート、アダマンタンジメタノールジ（メタ）アクリレート、アダマンタンジエタノールジ（メタ）アクリレート、ジメチロールジシクロペンタンジ（メタ）アクリレート、ノルボルナンジメチロールジ（メタ）アクリレート、シクロヘキサントリメタノールトリ（メタ）アクリレート、アダマンチルトリ（メタ）アクリレート、アダマンタントリメタノールトリ（メタ）アクリレート、ノルボルナントリメチロールトリ（メタ）アクリレート、トリシクロデカントリメタノールトリ（メタ）アクリレート、パーヒドロ－１，４，５，８－ジメタノナフタレン－２，３，７－（オキシメチル）トリ（メタ）アクリレート等の多官能（メタ）アクリレートが挙げられる。これらの（メタ）アクリレートは、単独で使用しても良いし、１種以上を混合して使用しても良い。
Specific examples of (meth)acrylates containing an alicyclic structure include cyclohexyl (meth)acrylate, cyclohexanedimethanol mono(meth)acrylate, 4-tert-butylcyclohexyl (meth)acrylate, and 3,3,5-trimethylcyclohexyl ( meth)acrylate, 3,3,5-trimethylcyclohexanol (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentadienyl (meth)acrylate, 2-dicyclopene tenoxyethyl (meth)acrylate, dicyclopentenyloxyethyl methacrylate, bornyl (meth)acrylate, isobornyl (meth)acrylate, tricyclodecanyl (meth)acrylate, tricyclodecane dimethanol mono(meth)acrylate, adamantyl (meth)acrylate ) acrylate, monofunctional (meth)acrylates such as cyclohexanedimethanol di(meth)acrylate, dicyclopentanyl di(meth)acrylate, dicyclopentenyl di(meth)acrylate, dicyclopentadienyl di(meth)acrylate , bornyl di(meth)acrylate, isobornyl di(meth)acrylate, tricyclodecanyl di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, adamantyl di(meth)acrylate, adamantane dimethanol di(meth)acrylate, Adamantane diethanol di(meth)acrylate, dimethylol dicyclopentane di(meth)acrylate, norbornane dimethylol di(meth)acrylate, cyclohexane trimethanol tri(meth)acrylate, adamantyl tri(meth)acrylate, adamantane trimethanol tri(meth)acrylate ) acrylate, norbornane trimethylol tri(meth)acrylate, tricyclodecane trimethanol tri(meth)acrylate, perhydro-1,4,5,8-dimethanonaphthalene-2,3,7-(oxymethyl)tri(meth)acrylate ) acrylate and other polyfunctional (meth)acrylates. These (meth)acrylates may be used alone or in combination of one or more.
脂環式構造を含む（メタ）アクリレートの配合割合は、ハードコート層形成用組成物の全固形分の２０質量％以上とすることが好ましい。脂環式構造を含む（メタ）アクリレートの配合割合が全固形分の２０質量％以上である場合、保護フィルムＡの透湿度を後述する範囲内とすることができ、ハードコート層３の耐屈曲性を向上させることができる。脂環式構造を含む（メタ）アクリレートの配合割合の上限は特に限定されないが、光重合開始剤が添加されるため、全固形分の９９質量％以下である。
The blending ratio of the (meth)acrylate containing an alicyclic structure is preferably 20% by mass or more of the total solid content of the composition for forming a hard coat layer. When the blending ratio of (meth)acrylate containing an alicyclic structure is 20% by mass or more of the total solid content, the moisture permeability of the protective film A can be within the range described below, and the bending resistance of the hard coat layer 3 can be improved. can improve sex. The upper limit of the blending ratio of (meth)acrylate containing an alicyclic structure is not particularly limited, but since a photopolymerization initiator is added, it is 99% by mass or less of the total solid content.
脂環式構造を含む（メタ）アクリレートに加え、他の活性エネルギー線硬化型化合物を使用しても良い。活性エネルギー線硬化型化合物としては、例えば、単官能、２官能または３官能以上の（メタ）アクリレートモノマーを使用できる。
In addition to the (meth)acrylate containing an alicyclic structure, other active energy ray-curable compounds may be used. As the active energy ray-curable compound, for example, monofunctional, bifunctional, or trifunctional or more functional (meth)acrylate monomers can be used.
単官能の（メタ）アクリレート化合物の例としては、２－ヒドロキシエチル（メタ）アクリレート、２－ヒドロキシプロピル（メタ）アクリレート、２－ヒドロキシブチル（メタ）アクリレート、ｎ－ブチル（メタ）アクリレート、イソブチル（メタ）アクリレート、ｔ－ブチル（メタ）アクリレート、グリシジル（メタ）アクリレート、アクリロイルモルフォリン、Ｎ－ビニルピロリドン、テトラヒドロフルフリールアクリレート、シクロヘキシル（メタ）アクリレート、２－エチルヘキシル（メタ）アクリレート、イソボルニル（メタ）アクリレート、イソデシル（メタ）アクリレート、ラウリル（メタ）アクリレート、トリデシル（メタ）アクリレート、セチル（メタ）アクリレート、ステアリル（メタ）アクリレート、ベンジル（メタ）アクリレート、２－エトキシエチル（メタ）アクリレート、３－メトキシブチル（メタ）アクリレート、エチルカルビトール（メタ）アクリレート、リン酸（メタ）アクリレート、エチレンオキサイド変性リン酸（メタ）アクリレート、フェノキシ（メタ）アクリレート、エチレンオキサイド変性フェノキシ（メタ）アクリレート、プロピレンオキサイド変性フェノキシ（メタ）アクリレート、フェノール（メタ）アクリレート、エチレンオキサイド変性ノニルフェノール（メタ）アクリレート、プロピレンオキサイド変性ノニルフェノール（メタ）アクリレート、メトキシジエチレングリコール（メタ）アクリレート、メトキシポリチレングリコール（メタ）アクリレート、メトキシプロピレングリコール（メタ）アクリレート、２－（メタ）アクリロイルオキシエチル－２－ヒドロキシプロピルフタレート、２－ヒドロキシ－３－フェノキシプロピル（メタ）アクリレート、２－（メタ）アクリロイルオキシエチルハイドロゲンフタレート、２－（メタ）アクリロイルオキシプロピルハイドロゲンフタレート、２－（メタ）アクリロイルオキシプロピルヘキサヒドロハイドロゲンフタレート、２－（メタ）アクリロイルオキシプロピルテトラヒドロハイドロゲンフタレート、ジメチルアミノエチル（メタ）アクリレート、トリフルオロエチル（メタ）アクリレート、テトラフルオロプロピル（メタ）アクリレート、ヘキサフルオロプロピル（メタ）アクリレート、オクタフルオロプロピル（メタ）アクリレート、２－アダマンタン、アダマンタンジオールから誘導される１価のモノ（メタ）アクリレートを有するアダマンチルアクリレート等のアダマンタン誘導体モノ（メタ）アクリレート等が挙げられる。
Examples of monofunctional (meth)acrylate compounds include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, n-butyl (meth)acrylate, and isobutyl (meth)acrylate. meth)acrylate, t-butyl(meth)acrylate, glycidyl(meth)acrylate, acryloylmorpholine, N-vinylpyrrolidone, tetrahydrofurfuryl acrylate, cyclohexyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, isobornyl(meth)acrylate, ) acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, cetyl (meth)acrylate, stearyl (meth)acrylate, benzyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 3- Methoxybutyl (meth)acrylate, ethyl carbitol (meth)acrylate, phosphoric acid (meth)acrylate, ethylene oxide modified phosphoric acid (meth)acrylate, phenoxy (meth)acrylate, ethylene oxide modified phenoxy (meth)acrylate, propylene oxide modified Phenoxy (meth)acrylate, phenol (meth)acrylate, ethylene oxide-modified nonylphenol (meth)acrylate, propylene oxide-modified nonylphenol (meth)acrylate, methoxydiethylene glycol (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, methoxypropylene glycol ( meth)acrylate, 2-(meth)acryloyloxyethyl-2-hydroxypropyl phthalate, 2-hydroxy-3-phenoxypropyl(meth)acrylate, 2-(meth)acryloyloxyethyl hydrogen phthalate, 2-(meth)acryloyloxy Propyl hydrogen phthalate, 2-(meth)acryloyloxypropyl hexahydrohydrogen phthalate, 2-(meth)acryloyloxypropyl tetrahydrohydrogen phthalate, dimethylaminoethyl (meth)acrylate, trifluoroethyl (meth)acrylate, tetrafluoropropyl (meth) ) acrylate, hexafluoropropyl (meth)acrylate, octafluoropropyl (meth)acrylate, 2-adamantane, adamantane derivative mono(meth)acrylate such as adamantyl acrylate having a monovalent mono(meth)acrylate derived from adamantane diol etc.
２官能の（メタ）アクリレートの例としては、エチレングリコールジ（メタ）アクリレート、ジエチレングリコールジ（メタ）アクリレート、ブタンジオールジ（メタ）アクリレート、ヘキサンジオールジ（メタ）アクリレート、ノナンジオールジ（メタ）アクリレート、エトキシ化ヘキサンジオールジ（メタ）アクリレート、プロポキシ化ヘキサンジオールジ（メタ）アクリレート、ジエチレングリコールジ（メタ）アクリレート、ポリエチレングリコールジ（メタ）アクリレート、トリプロピレングリコールジ（メタ）アクリレート、ポリプロピレングリコールジ（メタ）アクリレート、ネオペンチルグリコ－ルジ（メタ）アクリレート、エトキシ化ネオペンチルグリコールジ（メタ）アクリレート、トリプロピレングリコールジ（メタ）アクリレート、ヒドロキシピバリン酸ネオペンチルグリコールジ（メタ）アクリレート等のジ（メタ）アクリレート等が挙げられる。
Examples of difunctional (meth)acrylates include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, butanediol di(meth)acrylate, hexanediol di(meth)acrylate, and nonanediol di(meth)acrylate. , ethoxylated hexanediol di(meth)acrylate, propoxylated hexanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, ) acrylate, neopentyl glycol di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, di(meth)acrylate such as neopentyl glycol hydroxypivalate di(meth)acrylate Examples include acrylate.
３官能以上の（メタ）アクリレートの例としては、トリメチロールプロパントリ（メタ）アクリレート、エトキシ化トリメチロールプロパントリ（メタ）アクリレート、プロポキシ化トリメチロールプロパントリ（メタ）アクリレート、トリス２－ヒドロキシエチルイソシアヌレートトリ（メタ）アクリレート、グリセリントリ（メタ）アクリレート等のトリ（メタ）アクリレート、ペンタエリスリトールトリ（メタ）アクリレート、ジペンタエリスリトールトリ（メタ）アクリレート、ジトリメチロールプロパントリ（メタ）アクリレート等の３官能の（メタ）アクリレート化合物や、ペンタエリスリトールテトラ（メタ）アクリレート、ジトリメチロールプロパンテトラ（メタ）アクリレート、ジペンタエリスリトールテトラ（メタ）アクリレート、ジペンタエリスリトールペンタ（メタ）アクリレート、ジトリメチロールプロパンペンタ（メタ）アクリレート、ジペンタエリスリトールヘキサ（メタ）アクリレート、ジトリメチロールプロパンヘキサ（メタ）アクリレート等の３官能以上の多官能（メタ）アクリレート化合物や、これら（メタ）アクリレートの一部をアルキル基やε－カプロラクトンで置換した多官能（メタ）アクリレート化合物等が挙げられる。
Examples of trifunctional or higher functional (meth)acrylates include trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, and tris-2-hydroxyethyl isocyanate. Trifunctional tri(meth)acrylates such as nurate tri(meth)acrylate, glycerin tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, and ditrimethylolpropane tri(meth)acrylate (meth)acrylate compounds, pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ditrimethylolpropane penta(meth)acrylate Acrylate, dipentaerythritol hexa(meth)acrylate, ditrimethylolpropane hexa(meth)acrylate, and other polyfunctional (meth)acrylate compounds with three or more functionalities, or some of these (meth)acrylates with an alkyl group or ε-caprolactone. Examples include substituted polyfunctional (meth)acrylate compounds.
また、多官能モノマーとして、ウレタン（メタ）アクリレートも使用できる。ウレタン（メタ）アクリレートとしては、例えば、ポリエステルポリオールにイソシアネートモノマー、もしくはプレポリマーを反応させて得られた生成物に水酸基を有する（メタ）アクリレートモノマーを反応させることによって得られるものを挙げることができる。
Additionally, urethane (meth)acrylate can also be used as a polyfunctional monomer. Examples of urethane (meth)acrylate include those obtained by reacting a (meth)acrylate monomer having a hydroxyl group with a product obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer. .
ウレタン（メタ）アクリレートの例としては、ペンタエリスリトールトリアクリレートヘキサメチレンジイソシアネートウレタンプレポリマー、ジペンタエリスリトールペンタアクリレートヘキサメチレンジイソシアネートウレタンプレポリマー、ペンタエリスリトールトリアクリレートトルエンジイソシアネートウレタンプレポリマー、ジペンタエリスリトールペンタアクリレートトルエンジイソシアネートウレタンプレポリマー、ペンタエリスリトールトリアクリレートイソホロンジイソシアネートウレタンプレポリマー、ジペンタエリスリトールペンタアクリレートイソホロンジイソシアネートウレタンプレポリマー等が挙げられる。
Examples of urethane (meth)acrylates include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate Examples include urethane prepolymer, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymer.
上述した多官能モノマーは１種を用いても良いし、２種以上を組み合わせて用いても良い。また、上述した多官能モノマーは、組成物中でモノマーであっても良いし、一部が重合したオリゴマーであっても良い。
The above-mentioned polyfunctional monomers may be used alone or in combination of two or more. Further, the above-mentioned polyfunctional monomer may be a monomer in the composition, or may be a partially polymerized oligomer.
重合開始剤としては、紫外線照射によりラジカルを発生する重合開始剤を使用することができる。重合開始剤としては、アセトフェノン系、ベンゾフェノン系、チオキサントン系、ベンゾイン、ベンゾインメチルエーテル、アシルフォスフィンオキシド等のラジカル重合開始剤に使用することができる。重合開始剤として、例えば、ジフェニル（２，４，６－トリメチルベンゾイル）ホスフィンオキシド、ビス（２，４，６－トリメチルベンゾイル）フェニルホスフィンオキシド、２，２－ジエトキシアセトフェノン、１－ヒドロキシシクロヘキシルフェニルケトン、２，２－ジメトキシ－フェニルアセトフェノン、ジベンゾイル、ベンゾイン、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ｐ－クロロベンゾフェノン、ｐ－メトキシベンゾフェノン、ミヒラーケトン、アセトフェノン、２－クロロチオキサントン等を使用できる。これらのうち１種類を単独で使用しても良いし、２種類以上を組み合わせて使用しても良い。
As the polymerization initiator, a polymerization initiator that generates radicals upon irradiation with ultraviolet rays can be used. As the polymerization initiator, radical polymerization initiators such as acetophenone, benzophenone, thioxanthone, benzoin, benzoin methyl ether, and acylphosphine oxide can be used. As a polymerization initiator, for example, diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, 2,2-diethoxyacetophenone, 1-hydroxycyclohexylphenyl ketone , 2,2-dimethoxy-phenylacetophenone, dibenzoyl, benzoin, benzoin methyl ether, benzoin ethyl ether, p-chlorobenzophenone, p-methoxybenzophenone, Michler's ketone, acetophenone, 2-chlorothioxanthone, and the like. One type of these may be used alone, or two or more types may be used in combination.
ハードコート層形成用組成物には、必要に応じて、溶剤を添加しても良い。溶剤としては、メタノール、エタノール、１－プロパノール、２－プロパノール、ブタノール、イソプロピルアルコール、イソブタノール等のアルコール類、アセトン、メチルエチルケトン、シクロヘキサノン、メチルイソブチルケトン等のケトン類、ジアセトンアルコール等のケトンアルコール類、ベンゼン、トルエン、キシレン等の芳香族炭化水素類、エチレングリコール、プロピレングリコール、ヘキシレングリコール等のグリコール類、エチルセロソルブ、ブチルセロソルブ、エチルカルビトール、ブチルカルビトール、ジエチルセロソルブ、ジエチルカルビトール、プロピレングリコールモノメチルエーテル等のグリコールエーテル類、炭酸ジメチル、乳酸メチル、乳酸エチル、酢酸メチル、酢酸エチル、酢酸ブチル、酢酸アミル等のエステル類、ジメチルエーテル、ジエチルエーテル等のエーテル類、Ｎ－メチルピロリドン、ジメチルフォルムアミド等のうち、１種類または２種類以上を混合して使用できる。
A solvent may be added to the composition for forming a hard coat layer, if necessary. Examples of solvents include alcohols such as methanol, ethanol, 1-propanol, 2-propanol, butanol, isopropyl alcohol, and isobutanol, ketones such as acetone, methyl ethyl ketone, cyclohexanone, and methyl isobutyl ketone, and ketone alcohols such as diacetone alcohol. , aromatic hydrocarbons such as benzene, toluene, xylene, glycols such as ethylene glycol, propylene glycol, hexylene glycol, ethyl cellosolve, butyl cellosolve, ethyl carbitol, butyl carbitol, diethyl cellosolve, diethyl carbitol, propylene glycol Glycol ethers such as monomethyl ether, esters such as dimethyl carbonate, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate, butyl acetate, amyl acetate, ethers such as dimethyl ether, diethyl ether, N-methylpyrrolidone, dimethylformamide Among them, one type or a mixture of two or more types can be used.
また、ハードコート層形成用組成物には、帯電防止剤、消泡剤、酸化防止剤、紫外線吸収剤、赤外線吸収剤、色材、光安定剤、重合禁止剤、光増感剤、防汚剤、レベリング剤、撥油剤、撥水剤、指紋付着防止剤等の各種添加剤等を必要に応じて添加しても良い。
In addition, the composition for forming a hard coat layer includes an antistatic agent, an antifoaming agent, an antioxidant, an ultraviolet absorber, an infrared absorber, a coloring material, a light stabilizer, a polymerization inhibitor, a photosensitizer, and an antifouling agent. Various additives such as an agent, a leveling agent, an oil repellent, a water repellent, an anti-fingerprint agent, etc. may be added as necessary.
ハードコート層形成用組成物の塗工方法は特に限定されず、例えば、スピンコーター、ロールコーター、リバースロールコーター、グラビアコーター、マイクログラビアコーター、ナイフコーター、バーコーター、ワイヤーバーコーター、ダイコーター、ディップコーター、スプレーコーター、アプリケーター等を用いて塗工することができる。
The coating method of the composition for forming a hard coat layer is not particularly limited, and examples thereof include a spin coater, roll coater, reverse roll coater, gravure coater, microgravure coater, knife coater, bar coater, wire bar coater, die coater, and dip coater. Coating can be performed using a coater, spray coater, applicator, etc.
保護フィルムＡの厚み（総厚み）は、５０μｍ未満であることが好ましい。ハードコート層３を外側にして偏光板１０を屈曲させた場合、ハードコート層３の表面に応力が集中する。保護フィルムＡの厚みが５０μｍ以上の場合、偏光板１０を屈曲させた際にハードコート層３にクラックが生じやすくなる。
The thickness (total thickness) of the protective film A is preferably less than 50 μm. When the polarizing plate 10 is bent with the hard coat layer 3 facing outside, stress is concentrated on the surface of the hard coat layer 3. When the thickness of the protective film A is 50 μm or more, cracks are likely to occur in the hard coat layer 3 when the polarizing plate 10 is bent.
また、保護フィルムＡ（ハードコートフィルム）の鉛筆硬度は３Ｈ以上であることが好ましい。保護フィルムＡの鉛筆硬度が３Ｈ以上である場合、偏光板の表面硬度が良好であり、耐久性が向上する。
Furthermore, the pencil hardness of the protective film A (hard coat film) is preferably 3H or higher. When the pencil hardness of the protective film A is 3H or more, the surface hardness of the polarizing plate is good and the durability is improved.
保護フィルムＡに用いるＴＡＣフィルム２の厚み及びハードコート層３の膜厚は、保護フィルムＡの層厚みが５０μｍである限り、特に限定されないが、一例として、ＴＡＣフィルム２の厚みは、２５～４０μｍであり、ハードコート層３の膜厚は、５～１０μｍである。
The thickness of the TAC film 2 and the hard coat layer 3 used in the protective film A are not particularly limited as long as the layer thickness of the protective film A is 50 μm, but as an example, the thickness of the TAC film 2 is 25 to 40 μm. The thickness of the hard coat layer 3 is 5 to 10 μm.
保護フィルムＢは、シクロオレフィンポリマー（ＣＯＰ）、ポリエチレンテレフタレート（ＰＥＴ）及びポリメチルメタクリレート（ＰＭＭＡ）のいずれかからなるフィルム低透湿性のフィルムである。保護フィルムＢは、例えば、紫外線硬化性の接着剤を介して偏光子１に貼り合わされる。保護フィルムＢの厚みは、特に限定されないが、１０～１００μｍであることが好ましい。
The protective film B is a low moisture permeable film made of cycloolefin polymer (COP), polyethylene terephthalate (PET), or polymethyl methacrylate (PMMA). The protective film B is bonded to the polarizer 1 via, for example, an ultraviolet curable adhesive. The thickness of the protective film B is not particularly limited, but is preferably 10 to 100 μm.
尚、表示装置において、保護フィルムＢが表示パネル側に配置され、保護フィルムＡのハードコート層が視認側（表示パネルとは反対側）に配置される。
Note that in the display device, the protective film B is placed on the display panel side, and the hard coat layer of the protective film A is placed on the viewing side (opposite side to the display panel).
保護フィルムＡのＴＡＣフィルムは、接着剤として水糊（ＰＶＡ水溶液）を用いて偏光子１のＰＶＡフィルムに貼り合わされる。尚、ＴＡＣフィルムとＰＶＡフィルムとの密着性を確保するため、貼り合わせの前に保護フィルムＡに鹸化処理が施される。保護フィルムＡの偏光子１への貼り合わせに水糊を用いるため、乾燥工程を経た後においても、接着剤層中及びＴＡＣフィルム中には水分が含まれ得る。保護フィルムＡ及びＢの両方を透湿度の低いフィルムを用いて構成した場合、外部からの水分の侵入は抑制されるものの、夏場の車内等の極めて高温な環境下において、接着剤及び／またはＴＡＣフィルムに含まれていた水分が偏光板１０内に留まり続けるため、偏光子１の劣化を引き起こす。
そこで、本実施形態に係る偏光板１０においては、保護フィルムＡの透湿度と保護フィルムＢの透湿度とに差を設け、かつ、保護フィルムＡ及び保護フィルムＢの透湿度をそれぞれ特定の範囲とすることによって、接着剤及び／またはＴＡＣフィルム由来の水分による偏光子１の劣化を抑制する。 The TAC film of the protective film A is bonded to the PVA film of the polarizer 1 using water glue (PVA aqueous solution) as an adhesive. Note that in order to ensure the adhesion between the TAC film and the PVA film, the protective film A is saponified before lamination. Since water glue is used to attach the protective film A to the polarizer 1, water may be contained in the adhesive layer and the TAC film even after the drying process. If both protective films A and B are made of films with low moisture permeability, the intrusion of moisture from the outside will be suppressed, but adhesive and/or TAC Moisture contained in the film continues to remain in the polarizing plate 10, causing deterioration of the polarizer 1.
Therefore, in the polarizing plate 10 according to the present embodiment, a difference is provided between the water vapor permeability of the protective film A and the water vapor permeability of the protective film B, and the water vapor permeability of the protective film A and the protective film B is set within a specific range. By doing so, deterioration of the polarizer 1 due to moisture derived from the adhesive and/or the TAC film is suppressed.
そこで、本実施形態に係る偏光板１０においては、保護フィルムＡの透湿度と保護フィルムＢの透湿度とに差を設け、かつ、保護フィルムＡ及び保護フィルムＢの透湿度をそれぞれ特定の範囲とすることによって、接着剤及び／またはＴＡＣフィルム由来の水分による偏光子１の劣化を抑制する。 The TAC film of the protective film A is bonded to the PVA film of the polarizer 1 using water glue (PVA aqueous solution) as an adhesive. Note that in order to ensure the adhesion between the TAC film and the PVA film, the protective film A is saponified before lamination. Since water glue is used to attach the protective film A to the polarizer 1, water may be contained in the adhesive layer and the TAC film even after the drying process. If both protective films A and B are made of films with low moisture permeability, the intrusion of moisture from the outside will be suppressed, but adhesive and/or TAC Moisture contained in the film continues to remain in the polarizing plate 10, causing deterioration of the polarizer 1.
Therefore, in the polarizing plate 10 according to the present embodiment, a difference is provided between the water vapor permeability of the protective film A and the water vapor permeability of the protective film B, and the water vapor permeability of the protective film A and the protective film B is set within a specific range. By doing so, deterioration of the polarizer 1 due to moisture derived from the adhesive and/or the TAC film is suppressed.
具体的に、４０℃９０％ＲＨにおける保護フィルムＡ及びＢの透湿度をそれぞれＴＡ及びＴＢとすると、ＴＡ及びＴＢは以下の条件（１）及び（２）を同時に満足する。尚、透湿度ＴＡ及びＴＢはいずれも、ＪＩＳ Ｚ ０２０８：１９７６に規定される、防湿包装材料の透湿度試験法（カップ法）に準拠して測定した値である。
２４０ｇ／ｍ２／ｄａｙ＞ＴＡ＞７０ｇ／ｍ２／ｄａｙ ・・・（１）
７０ｇ／ｍ２／ｄａｙ≧ＴＢ ・・・（２） Specifically, if the moisture permeability of the protective films A and B at 40° C. and 90% RH is TA and TB, respectively, TA and TB satisfy the following conditions (1) and (2) at the same time. The moisture permeability TA and TB are both values measured in accordance with the moisture permeability test method (cup method) for moisture-proof packaging materials specified in JIS Z 0208:1976.
240g/m 2 /day>TA>70g/m 2 /day...(1)
70g/m 2 /day≧TB...(2)
２４０ｇ／ｍ２／ｄａｙ＞ＴＡ＞７０ｇ／ｍ２／ｄａｙ ・・・（１）
７０ｇ／ｍ２／ｄａｙ≧ＴＢ ・・・（２） Specifically, if the moisture permeability of the protective films A and B at 40° C. and 90% RH is TA and TB, respectively, TA and TB satisfy the following conditions (1) and (2) at the same time. The moisture permeability TA and TB are both values measured in accordance with the moisture permeability test method (cup method) for moisture-proof packaging materials specified in JIS Z 0208:1976.
240g/m 2 /day>TA>70g/m 2 /day...(1)
70g/m 2 /day≧TB...(2)
本実施形態に係る偏光板１０は、上記の条件（１）及び（２）を同時に満足することにより、外部から偏光板内部への水分の侵入を抑制しつつ、例えば、８５℃の高温環境下に晒された場合に、保護フィルムＡと偏光子１との貼り合わせに用いた接着剤及び／または保護フィルムＡのＴＡＣフィルムから発生した水分を外部に排出させることができる。
By satisfying the above conditions (1) and (2) at the same time, the polarizing plate 10 according to the present embodiment can be used in a high-temperature environment of, for example, 85° C. while suppressing the intrusion of moisture from the outside into the inside of the polarizing plate. When exposed to water, moisture generated from the adhesive used to bond the protective film A and the polarizer 1 and/or the TAC film of the protective film A can be discharged to the outside.
以上説明したように、本実施形態に係る偏光板１０は、上記条件（１）及び（２）を満足する保護フィルムＡ及び保護フィルムＢを備える。この構成により、表示パネル側に配置される保護フィルムＢは水分の出入りをほぼ遮断する。一方、視認側に配置される保護フィルムＡは、外部から偏光板１０内部への水分の侵入を抑制しつつ、極めて高温な環境下において、偏光板１０内部で発生した水分の放出を可能とする。したがって、本実施形態に係る偏光板１０においては、高温環境下で用いられた場合に、偏光板１０の内部で発生した水分が留まらないため、偏光子の劣化を抑制し、より長期に渡って偏光板１０の光学性能を維持することが可能となる。
As explained above, the polarizing plate 10 according to the present embodiment includes the protective film A and the protective film B that satisfy the above conditions (1) and (2). With this configuration, the protective film B disposed on the display panel side substantially blocks moisture from entering and exiting. On the other hand, the protective film A disposed on the viewing side suppresses the intrusion of moisture from the outside into the inside of the polarizing plate 10 and allows the moisture generated inside the polarizing plate 10 to be released in an extremely high temperature environment. . Therefore, when the polarizing plate 10 according to the present embodiment is used in a high-temperature environment, the moisture generated inside the polarizing plate 10 does not remain, so deterioration of the polarizer is suppressed and the polarizer can be used for a longer period of time. It becomes possible to maintain the optical performance of the polarizing plate 10.
また、保護フィルムＡの厚みが５０μｍ未満であるため、偏光板１０の薄膜化が可能であると共に、偏光板１０の屈曲時にハードコート層３にクラックが発生することを抑制し、耐屈曲性を向上できる。
In addition, since the thickness of the protective film A is less than 50 μm, it is possible to make the polarizing plate 10 thinner, and it also suppresses the occurrence of cracks in the hard coat layer 3 when the polarizing plate 10 is bent, thereby improving the bending resistance. You can improve.
したがって、本実施形態によれば、薄膜かつ高屈曲でありながら、高温高湿環境における耐久性を備えた偏光板１０を提供できる。
Therefore, according to the present embodiment, it is possible to provide a polarizing plate 10 that is thin and highly flexible, yet has durability in a high temperature and high humidity environment.
本実施形態に係る偏光板１０は、液晶パネルや有機ＥＬパネル等の画像表示パネルと組み合わせて画像表示装置を構成するのに利用することができる。画像表示装置は、タッチパネルを備えても良い。本実施形態に係る偏光板１０は、高い屈曲性と高温高湿環境における耐久性を兼ね備えるので、車内の曲面部に設ける画像表示装置として好適に利用できる。
The polarizing plate 10 according to this embodiment can be used to configure an image display device in combination with an image display panel such as a liquid crystal panel or an organic EL panel. The image display device may include a touch panel. Since the polarizing plate 10 according to the present embodiment has both high flexibility and durability in high temperature and high humidity environments, it can be suitably used as an image display device provided on a curved surface inside a car.
以下、本発明を具体的に実施した実施例を説明する。
Examples in which the present invention was specifically implemented will be described below.
重合性材料、疎水性材料、光重合開始剤及び溶剤を表１に示す割合で含有するハードコート層形成用組成物を調整した。ハードコート層形成用組成物の全固形分中のジヒドロシクロペンタジエチルアクリレートの割合は、以下の通りである。
・組成１：１８％
・組成２：４５％
・組成３：９０％
・組成４： ９％
・組成５： ０％ A composition for forming a hard coat layer containing a polymerizable material, a hydrophobic material, a photopolymerization initiator, and a solvent in the proportions shown in Table 1 was prepared. The proportion of dihydrocyclopentadiethyl acrylate in the total solid content of the composition for forming a hard coat layer is as follows.
・Composition 1:18%
・Composition 2: 45%
・Composition 3: 90%
・Composition 4: 9%
・Composition 5: 0%
・組成１：１８％
・組成２：４５％
・組成３：９０％
・組成４： ９％
・組成５： ０％ A composition for forming a hard coat layer containing a polymerizable material, a hydrophobic material, a photopolymerization initiator, and a solvent in the proportions shown in Table 1 was prepared. The proportion of dihydrocyclopentadiethyl acrylate in the total solid content of the composition for forming a hard coat layer is as follows.
・Composition 1:18%
・Composition 2: 45%
・Composition 3: 90%
・Composition 4: 9%
・Composition 5: 0%
調整したハードコート層形成用組成物を厚み４０μｍのＴＡＣフィルム（商品名：ＴＪ２５ 富士フイルム社製）に、ワイヤーバーコーターを用いて硬化後の膜厚が表２に記載の値となるように塗布した。６０℃のオーブン内で１分間加熱して塗膜を乾燥させた後、ＵＶ硬化装置において窒素雰囲気下（酸素濃度５００ｐｐｍ以下）、積算光量が１００ｍＪ／ｃｍ２となるように紫外線を照射して塗膜を硬化させ、保護フィルムＡ（ハードコートフィルム）を作製した。また、厚み２６μｍのＣＯＰフィルムを保護フィルムＢとした。
The prepared composition for forming a hard coat layer was applied to a 40 μm thick TAC film (product name: TJ25 manufactured by Fujifilm) using a wire bar coater so that the film thickness after curing would be the value shown in Table 2. did. After drying the coating film by heating it in an oven at 60°C for 1 minute, it was irradiated with ultraviolet rays in a UV curing device under a nitrogen atmosphere (oxygen concentration 500 ppm or less) so that the cumulative light amount was 100 mJ/cm 2 . The film was cured to produce a protective film A (hard coat film). Moreover, a COP film with a thickness of 26 μm was used as a protective film B.
保護フィルムＡのＴＡＣフィルム面と偏光子とを水糊を用いて貼り合わせて乾燥させた後、紫外線硬化性接着剤を用いて偏光子に保護フィルムＢを貼り合わせ、紫外線を照射することにより紫外線硬化性接着剤を硬化させ、偏光板を得た。
After bonding the TAC film surface of protective film A and a polarizer using water glue and drying, bonding protective film B to the polarizer using an ultraviolet curable adhesive and irradiating it with ultraviolet rays. The curable adhesive was cured to obtain a polarizing plate.
（透湿度）
偏光子に貼り合わせる前の保護フィルムＡの透湿度ＴＡ及び保護フィルムＢの透湿度ＴＢを、ＪＩＳ Ｚ ０２０８：１９７６に規定される、防湿包装材料の透湿度試験法（カップ法）に準拠して、４０℃９０ＲＨ％の条件で測定した。 (moisture permeability)
The moisture permeability TA of the protective film A and the moisture permeability TB of the protective film B before being laminated to the polarizer were determined in accordance with the moisture permeability test method for moisture-proof packaging materials (cup method) specified in JIS Z 0208:1976. , 40°C and 90RH%.
偏光子に貼り合わせる前の保護フィルムＡの透湿度ＴＡ及び保護フィルムＢの透湿度ＴＢを、ＪＩＳ Ｚ ０２０８：１９７６に規定される、防湿包装材料の透湿度試験法（カップ法）に準拠して、４０℃９０ＲＨ％の条件で測定した。 (moisture permeability)
The moisture permeability TA of the protective film A and the moisture permeability TB of the protective film B before being laminated to the polarizer were determined in accordance with the moisture permeability test method for moisture-proof packaging materials (cup method) specified in JIS Z 0208:1976. , 40°C and 90RH%.
（耐屈曲性）
保護フィルムＡを３ｃｍ×１０ｃｍの大きさにカットしたサンプルを作製し、所定の径の鉄棒（マンドレル）にハードコート層が外側となるように巻き付け、表面にクラックが生じない鉄棒の最小径を耐屈曲性の評価値とした。 (Bending resistance)
A sample of protective film A was cut into a size of 3 cm x 10 cm, and then wrapped around an iron rod (mandrel) of a predetermined diameter with the hard coat layer on the outside. This was used as an evaluation value for flexibility.
保護フィルムＡを３ｃｍ×１０ｃｍの大きさにカットしたサンプルを作製し、所定の径の鉄棒（マンドレル）にハードコート層が外側となるように巻き付け、表面にクラックが生じない鉄棒の最小径を耐屈曲性の評価値とした。 (Bending resistance)
A sample of protective film A was cut into a size of 3 cm x 10 cm, and then wrapped around an iron rod (mandrel) of a predetermined diameter with the hard coat layer on the outside. This was used as an evaluation value for flexibility.
（鉛筆硬度）
鉛筆（三菱鉛筆株式会社製 ｕｎｉ、３Ｈ）及びクレメンス型引っ掻き試験機（ＨＡ－３０１、テスター産業株式会社製）を用いて、荷重５００ｇ、引っ掻き速度０．５ｍｍ／ｓｅｃの条件で、保護フィルムＡのハードコート層表面の引っ掻き試験を行った。５枚のサンプルで引っ掻き試験を行い、ハードコート層表面に傷が認められたサンプルが２枚以上あった場合をＮＧ、それ以外をＯＫと評価した。 (Pencil hardness)
Using a pencil (uni, 3H, manufactured by Mitsubishi Pencil Co., Ltd.) and a Clemens scratch tester (HA-301, manufactured by Tester Sangyo Co., Ltd.), the protective film A was tested under the conditions of a load of 500 g and a scratching speed of 0.5 mm/sec. A scratch test was conducted on the surface of the hard coat layer. A scratch test was conducted on five samples, and the cases where two or more samples had scratches on the surface of the hard coat layer were evaluated as NG, and the others were evaluated as OK.
鉛筆（三菱鉛筆株式会社製 ｕｎｉ、３Ｈ）及びクレメンス型引っ掻き試験機（ＨＡ－３０１、テスター産業株式会社製）を用いて、荷重５００ｇ、引っ掻き速度０．５ｍｍ／ｓｅｃの条件で、保護フィルムＡのハードコート層表面の引っ掻き試験を行った。５枚のサンプルで引っ掻き試験を行い、ハードコート層表面に傷が認められたサンプルが２枚以上あった場合をＮＧ、それ以外をＯＫと評価した。 (Pencil hardness)
Using a pencil (uni, 3H, manufactured by Mitsubishi Pencil Co., Ltd.) and a Clemens scratch tester (HA-301, manufactured by Tester Sangyo Co., Ltd.), the protective film A was tested under the conditions of a load of 500 g and a scratching speed of 0.5 mm/sec. A scratch test was conducted on the surface of the hard coat layer. A scratch test was conducted on five samples, and the cases where two or more samples had scratches on the surface of the hard coat layer were evaluated as NG, and the others were evaluated as OK.
（高温高湿耐久試験後の偏光板の偏光度）
各実施例及び各比較例に係る偏光板を８５℃８５％ＲＨの恒温槽に投入し、投入から２４０時間後及び５００時間後の偏光度を測定した。尚、偏光度は、積分球付き吸光光度計（日本分光株式会社製「Ｖ７１００」）により測定した値に対して、ＪＩＳ Ｚ ８７０１の２度視野（Ｃ光源）により視感度補正を行うことで算出した。 (Degree of polarization of polarizing plate after high temperature and high humidity durability test)
The polarizing plate according to each Example and each Comparative Example was placed in a constant temperature bath at 85° C. and 85% RH, and the degree of polarization was measured 240 hours and 500 hours after the addition. The degree of polarization is calculated by correcting the visual sensitivity using the 2-degree field of view (C light source) of JIS Z 8701 on the value measured with an absorbance photometer with an integrating sphere (V7100, manufactured by JASCO Corporation). did.
各実施例及び各比較例に係る偏光板を８５℃８５％ＲＨの恒温槽に投入し、投入から２４０時間後及び５００時間後の偏光度を測定した。尚、偏光度は、積分球付き吸光光度計（日本分光株式会社製「Ｖ７１００」）により測定した値に対して、ＪＩＳ Ｚ ８７０１の２度視野（Ｃ光源）により視感度補正を行うことで算出した。 (Degree of polarization of polarizing plate after high temperature and high humidity durability test)
The polarizing plate according to each Example and each Comparative Example was placed in a constant temperature bath at 85° C. and 85% RH, and the degree of polarization was measured 240 hours and 500 hours after the addition. The degree of polarization is calculated by correcting the visual sensitivity using the 2-degree field of view (C light source) of JIS Z 8701 on the value measured with an absorbance photometer with an integrating sphere (V7100, manufactured by JASCO Corporation). did.
表２に、各実施例及び各比較例に係る保護フィルムＡ及びＢの諸特性と、偏光板の偏光度の測定値（初期値、高温高湿耐久試験前及び後）を示す。
Table 2 shows various properties of the protective films A and B according to each Example and each Comparative Example, and measured values of the degree of polarization of the polarizing plate (initial value, before and after the high temperature and high humidity durability test).
実施例１～７に係る偏光板は、保護フィルムＡの透湿度ＴＡ及び保護フィルムＢの透湿度ＴＢが上記の条件（１）及び（２）を満足するものであるため、８５℃８５％ＲＨの恒温槽に５００時間投入された後でも、高い偏光度の値を示した。また、保護フィルムＡの層厚みが５０μｍ未満であるため、２ｍｍ径のマンドレルに巻き付けた場合でも、ハードコート層表面にクラックが生じず、耐屈曲性が優れていた。また、保護フィルムＡがハードコート層を有するため、ハードコート層を設けていない比較例１２及び１３と比べて表面硬度も優れていた。
Since the polarizing plates according to Examples 1 to 7 satisfy the above conditions (1) and (2), the water vapor permeability TA of the protective film A and the water vapor permeability TB of the protective film B satisfy the above conditions (1) and (2). Even after being placed in a constant temperature bath for 500 hours, it showed a high degree of polarization. Moreover, since the layer thickness of the protective film A was less than 50 μm, even when it was wound around a mandrel with a diameter of 2 mm, no cracks were generated on the surface of the hard coat layer, and the bending resistance was excellent. Moreover, since the protective film A had a hard coat layer, the surface hardness was also excellent compared to Comparative Examples 12 and 13, which did not have a hard coat layer.
これに対して、比較例１においては、保護フィルムＡの層厚みが５０μｍであるため、２ｍｍ系のマンドレルに巻き付けた場合、ハードコート層表面にクラックが発生し、実施例と比べて保護フィルムＡの耐屈曲性が劣っていた。
On the other hand, in Comparative Example 1, since the layer thickness of the protective film A is 50 μm, cracks occur on the surface of the hard coat layer when it is wound around a 2 mm mandrel. The bending resistance was poor.
比較例２に係る偏光板は、保護フィルムＡの透湿度ＴＡが高いために、外部からの水分の侵入を十分に抑制できず、８５℃、８５％ＲＨの恒温槽に５００時間投入された後の偏光度が実施例と比べて低下した。
The polarizing plate according to Comparative Example 2 was unable to sufficiently suppress the intrusion of moisture from the outside due to the high moisture permeability TA of the protective film A, and after being placed in a constant temperature bath at 85° C. and 85% RH for 500 hours. The degree of polarization of the sample was lower than that of the example.
比較例３～６に係る偏光板は、保護フィルムＡのハードコート層中の脂環式構造を有する（メタ）アクリレート由来の構成単位が少ないために、耐屈曲性が十分に発現せず、実施例と比べて保護フィルムＡの耐屈曲性が劣っていた。尚、比較例３～６と同じ組成物でハードコート層を形成した比較例２の保護フィルムＡが実施例と同様の耐屈曲性を示したのは、比較例２の保護フィルムＡの層厚みが相対的に薄く、ハードコート層表面の応力集中が抑制されたためと考えられる。
The polarizing plates according to Comparative Examples 3 to 6 did not have sufficient bending resistance due to the small number of structural units derived from (meth)acrylate having an alicyclic structure in the hard coat layer of the protective film A. The bending resistance of the protective film A was inferior to that of the example. It should be noted that the reason why the protective film A of Comparative Example 2, in which the hard coat layer was formed with the same composition as Comparative Examples 3 to 6, exhibited the same bending resistance as that of the example was due to the layer thickness of the protective film A of Comparative Example 2. This is thought to be because the hard coat layer was relatively thin and stress concentration on the surface of the hard coat layer was suppressed.
比較例７～９に係る偏光板は、保護フィルムＡの透湿度ＴＡが高いために、外部からの水分の侵入を十分に抑制できず、８５℃、８５％ＲＨの恒温槽に５００時間投入された後の偏光度が実施例と比べて低下した。また、比較例８及び９に係る偏光板は、保護フィルムＡのハードコート層中に脂環式構造を有する（メタ）アクリレート由来の構成単位が含まれていないために、耐屈曲性が十分に発現せず、実施例と比べて保護フィルムＡの耐屈曲性が劣っていた。尚、比較例８及び９と同じ組成物でハードコート層を形成した比較例７の保護フィルムＡが実施例と同様の耐屈曲性を示したのは、比較例７の保護フィルムＡの層厚みが相対的に薄く、ハードコート層表面の応力集中が抑制されたためと考えられる。
The polarizing plates according to Comparative Examples 7 to 9 were unable to sufficiently suppress the intrusion of moisture from the outside due to the high moisture permeability TA of the protective film A, and were placed in a constant temperature bath at 85° C. and 85% RH for 500 hours. The degree of polarization after the test was lower than that of the example. In addition, the polarizing plates according to Comparative Examples 8 and 9 did not have sufficient bending resistance because the hard coat layer of the protective film A did not contain a (meth)acrylate-derived structural unit having an alicyclic structure. This did not occur, and the bending resistance of the protective film A was inferior to that of the examples. It should be noted that the reason why the protective film A of Comparative Example 7, in which the hard coat layer was formed with the same composition as Comparative Examples 8 and 9, exhibited the same bending resistance as that of the example was due to the layer thickness of the protective film A of Comparative Example 7. This is thought to be because the hard coat layer was relatively thin and stress concentration on the surface of the hard coat layer was suppressed.
比較例１０及び１１に係る偏光板は、保護フィルムＡのハードコート層中に脂環式構造を有する（メタ）アクリレート由来の構成単位が含まれていないために、耐屈曲性が十分に発現せず、実施例と比べて保護フィルムＡの耐屈曲性が劣っていた。
The polarizing plates according to Comparative Examples 10 and 11 did not have sufficient bending resistance because the hard coat layer of the protective film A did not contain a (meth)acrylate-derived structural unit having an alicyclic structure. First, the bending resistance of the protective film A was inferior to that of the examples.
比較例１２及び１３に係る偏光板は、８５℃、８５％ＲＨの恒温槽に５００時間投入された後の偏光度が実施例と比べて低下した。これは、保護フィルムＡの透湿度ＴＡが低過ぎるために、高温高湿下に晒された場合に、保護フィルムＡ及び／または接着剤（水糊）に含まれていた水分が偏光板内に留まり続け、この結果、偏光子の劣化が生じたものと考えられる。また、比較例１２及び１３の保護フィルムＡは、ハードコート層が設けられていないため、実施例と比べて表面硬度が劣っていた。
The degree of polarization of the polarizing plates according to Comparative Examples 12 and 13 after being placed in a constant temperature bath at 85° C. and 85% RH for 500 hours was lower than that of the example. This is because the moisture permeability TA of the protective film A is too low, so when exposed to high temperature and high humidity, the moisture contained in the protective film A and/or the adhesive (water paste) enters the polarizing plate. It is thought that the polarizer continued to remain there, and as a result, the polarizer deteriorated. Moreover, since the protective films A of Comparative Examples 12 and 13 were not provided with a hard coat layer, the surface hardness was inferior to that of the Examples.
本発明は、表示装置に用いる偏光板として利用することができ、特に、車載用途等の高温環境下で用いられる表示装置の偏光板として好適である。
The present invention can be used as a polarizing plate for display devices, and is particularly suitable as a polarizing plate for display devices used in high-temperature environments such as in-vehicle applications.
１ 偏光子
２ ＴＡＣフィルム
３ ハードコート層
１０ 偏光板
Ａ 保護フィルムＡ
Ｂ 保護フィルムＢ 1 Polarizer 2 TAC film 3 Hard coat layer 10 Polarizing plate A Protective film A
B Protective film B
２ ＴＡＣフィルム
３ ハードコート層
１０ 偏光板
Ａ 保護フィルムＡ
Ｂ 保護フィルムＢ 1 Polarizer 2 TAC film 3 Hard coat layer 10 Polarizing plate A Protective film A
B Protective film B
Claims (5)
- 偏光子の一方面に保護フィルムＡが貼り合わされ、他方面に保護フィルムＢが貼り合わされた偏光板であって、
４０℃９０％ＲＨにおける前記保護フィルムＡの透湿度ＴＡ及び前記保護フィルムＢの透湿度ＴＢが以下の条件（１）及び（２）を同時に満足し、
前記保護フィルムＡが、脂環式構造を含む（メタ）アクリレート化合物と、光重合開始剤とを含有し、前記脂環式構造を含む（メタ）アクリレート化合物の含有割合が全固形分の２０質量％以上である組成物の硬化膜からなるハードコート層を有し、
前記保護フィルムＡの厚みが５０μｍ未満であることを特徴とする、偏光板。
２４０ｇ／ｍ２／ｄａｙ＞ＴＡ＞７０ｇ／ｍ２／ｄａｙ ・・・（１）
７０ｇ／ｍ２／ｄａｙ≧ＴＢ ・・・（２） A polarizing plate in which a protective film A is pasted on one side of a polarizer and a protective film B is pasted on the other side,
The moisture permeability TA of the protective film A and the moisture permeability TB of the protective film B at 40° C. and 90% RH simultaneously satisfy the following conditions (1) and (2),
The protective film A contains a (meth)acrylate compound containing an alicyclic structure and a photopolymerization initiator, and the content ratio of the (meth)acrylate compound containing an alicyclic structure is 20% by mass of the total solids. % or more, having a hard coat layer consisting of a cured film of the composition,
A polarizing plate, characterized in that the thickness of the protective film A is less than 50 μm.
240g/m 2 /day>TA>70g/m 2 /day...(1)
70g/m 2 /day≧TB...(2) - 前記保護フィルムＡが、トリアセチルセルロースフィルムの一面に前記ハードコート層が積層されたハードコートフィルムである、請求項１に記載の偏光板。 The polarizing plate according to claim 1, wherein the protective film A is a hard coat film in which the hard coat layer is laminated on one side of a triacetyl cellulose film.
- 前記ハードコートフィルムの鉛筆硬度が３Ｈ以上である、請求項２に記載の偏光板。 The polarizing plate according to claim 2, wherein the hard coat film has a pencil hardness of 3H or more.
- 前記保護フィルムＢが、シクロオレフィンポリマー、ポリエチレンテレフタレート及びポリメチルメタクリレートのいずれか１種からなるフィルムである、請求項１に記載の偏光板。 The polarizing plate according to claim 1, wherein the protective film B is a film made of any one of cycloolefin polymer, polyethylene terephthalate, and polymethyl methacrylate.
- 請求項１～４のいずれかに記載の偏光板を備える、表示装置。 A display device comprising the polarizing plate according to any one of claims 1 to 4.
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| JP2022097529 | 2022-06-16 | ||
| JP2022-097529 | 2022-06-16 |
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Citations (6)
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| JP2017066380A (en) * | 2015-09-24 | 2017-04-06 | 荒川化学工業株式会社 | Optical active energy ray curable resin composition and optical film |
| JP2017119847A (en) * | 2015-12-25 | 2017-07-06 | 日東電工株式会社 | Rubber-based adhesive composition, rubber-based adhesive layer, optical film with rubber-based adhesive layer, optical member, image display device and production method of rubber-based adhesive layer |
| JP2018127610A (en) * | 2017-02-08 | 2018-08-16 | 日東電工株式会社 | Adhesive composition for polarizing films, polarizing film, optical film and image display device |
| JP2021144076A (en) * | 2020-03-10 | 2021-09-24 | 株式会社トッパンＴｏｍｏｅｇａｗａオプティカルフィルム | Polarizing plate and display device using the same |
| JP2021189259A (en) * | 2020-05-28 | 2021-12-13 | 日東電工株式会社 | Polarizing plate having retardation layer and adhesive layer, and organic electroluminescent display device using the same |
| JP2022181008A (en) * | 2021-05-25 | 2022-12-07 | 日東電工株式会社 | Polarizing plate, and image display device using the polarizing plate |
-
2023
- 2023-06-14 WO PCT/JP2023/022054 patent/WO2023243655A1/en unknown
- 2023-06-16 TW TW112122572A patent/TW202401052A/en unknown
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| JP2017066380A (en) * | 2015-09-24 | 2017-04-06 | 荒川化学工業株式会社 | Optical active energy ray curable resin composition and optical film |
| JP2017119847A (en) * | 2015-12-25 | 2017-07-06 | 日東電工株式会社 | Rubber-based adhesive composition, rubber-based adhesive layer, optical film with rubber-based adhesive layer, optical member, image display device and production method of rubber-based adhesive layer |
| JP2018127610A (en) * | 2017-02-08 | 2018-08-16 | 日東電工株式会社 | Adhesive composition for polarizing films, polarizing film, optical film and image display device |
| JP2021144076A (en) * | 2020-03-10 | 2021-09-24 | 株式会社トッパンＴｏｍｏｅｇａｗａオプティカルフィルム | Polarizing plate and display device using the same |
| JP2021189259A (en) * | 2020-05-28 | 2021-12-13 | 日東電工株式会社 | Polarizing plate having retardation layer and adhesive layer, and organic electroluminescent display device using the same |
| JP2022181008A (en) * | 2021-05-25 | 2022-12-07 | 日東電工株式会社 | Polarizing plate, and image display device using the polarizing plate |
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