CN112505814A - Optical laminate and display device using same - Google Patents
Optical laminate and display device using same Download PDFInfo
- Publication number
- CN112505814A CN112505814A CN202010931983.6A CN202010931983A CN112505814A CN 112505814 A CN112505814 A CN 112505814A CN 202010931983 A CN202010931983 A CN 202010931983A CN 112505814 A CN112505814 A CN 112505814A
- Authority
- CN
- China
- Prior art keywords
- film
- resin
- protective film
- meth
- optical laminate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 67
- 230000001681 protective effect Effects 0.000 claims abstract description 91
- 238000010521 absorption reaction Methods 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 claims description 107
- 239000011347 resin Substances 0.000 claims description 107
- 239000004925 Acrylic resin Substances 0.000 claims description 34
- 229920000178 Acrylic resin Polymers 0.000 claims description 34
- 239000012790 adhesive layer Substances 0.000 claims description 32
- 150000001925 cycloalkenes Chemical class 0.000 claims description 12
- PEEHTFAAVSWFBL-UHFFFAOYSA-N Maleimide Chemical compound O=C1NC(=O)C=C1 PEEHTFAAVSWFBL-UHFFFAOYSA-N 0.000 claims description 7
- 229920005990 polystyrene resin Polymers 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 description 47
- 230000001070 adhesive effect Effects 0.000 description 47
- -1 acryl Chemical group 0.000 description 36
- 229920002451 polyvinyl alcohol Polymers 0.000 description 35
- 239000004372 Polyvinyl alcohol Substances 0.000 description 34
- 238000000034 method Methods 0.000 description 32
- 239000004973 liquid crystal related substance Substances 0.000 description 29
- KNCYXPMJDCCGSJ-UHFFFAOYSA-N piperidine-2,6-dione Chemical group O=C1CCCC(=O)N1 KNCYXPMJDCCGSJ-UHFFFAOYSA-N 0.000 description 29
- 239000010410 layer Substances 0.000 description 27
- 150000001875 compounds Chemical class 0.000 description 26
- 238000011282 treatment Methods 0.000 description 22
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 18
- 239000000975 dye Substances 0.000 description 18
- 239000000178 monomer Substances 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 229920001577 copolymer Polymers 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 15
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 14
- 229920000642 polymer Polymers 0.000 description 13
- 238000001125 extrusion Methods 0.000 description 12
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 11
- 229910052739 hydrogen Inorganic materials 0.000 description 11
- 239000001257 hydrogen Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 11
- 229920005672 polyolefin resin Polymers 0.000 description 10
- 229920002284 Cellulose triacetate Polymers 0.000 description 9
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 9
- 239000007864 aqueous solution Substances 0.000 description 9
- 229920002678 cellulose Polymers 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 9
- JFNLZVQOOSMTJK-KNVOCYPGSA-N norbornene Chemical compound C1[C@@H]2CC[C@H]1C=C2 JFNLZVQOOSMTJK-KNVOCYPGSA-N 0.000 description 9
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 9
- 125000004432 carbon atom Chemical group C* 0.000 description 8
- 239000000654 additive Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 7
- 238000003851 corona treatment Methods 0.000 description 7
- 239000003431 cross linking reagent Substances 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- 230000009477 glass transition Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 239000004593 Epoxy Substances 0.000 description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 238000004043 dyeing Methods 0.000 description 6
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 description 6
- 239000000155 melt Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 229920005992 thermoplastic resin Polymers 0.000 description 6
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 5
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 5
- 239000004327 boric acid Substances 0.000 description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 5
- 239000001913 cellulose Substances 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 150000002431 hydrogen Chemical class 0.000 description 5
- 239000004417 polycarbonate Substances 0.000 description 5
- 229920000515 polycarbonate Polymers 0.000 description 5
- 229920001721 polyimide Polymers 0.000 description 5
- 229920006254 polymer film Polymers 0.000 description 5
- 238000006116 polymerization reaction Methods 0.000 description 5
- 229920002689 polyvinyl acetate Polymers 0.000 description 5
- 239000011118 polyvinyl acetate Substances 0.000 description 5
- 229920002554 vinyl polymer Polymers 0.000 description 5
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000004642 Polyimide Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 150000001336 alkenes Chemical class 0.000 description 4
- 229920005601 base polymer Polymers 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- 239000011630 iodine Substances 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 239000004926 polymethyl methacrylate Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 238000007127 saponification reaction Methods 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- 125000004209 (C1-C8) alkyl group Chemical group 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 3
- 239000004962 Polyamide-imide Substances 0.000 description 3
- 239000004695 Polyether sulfone Substances 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 3
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 150000001735 carboxylic acids Chemical class 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229920005994 diacetyl cellulose Polymers 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 229940015043 glyoxal Drugs 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 150000002596 lactones Chemical group 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 3
- 229920002492 poly(sulfone) Polymers 0.000 description 3
- 229920002312 polyamide-imide Polymers 0.000 description 3
- 229920001230 polyarylate Polymers 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920006393 polyether sulfone Polymers 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- 239000011342 resin composition Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 125000001424 substituent group Chemical group 0.000 description 3
- 239000002335 surface treatment layer Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 2
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 2
- 150000001241 acetals Chemical class 0.000 description 2
- 229940081735 acetylcellulose Drugs 0.000 description 2
- 150000008065 acid anhydrides Chemical class 0.000 description 2
- 239000003522 acrylic cement Substances 0.000 description 2
- 229920006243 acrylic copolymer Polymers 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 239000012461 cellulose resin Substances 0.000 description 2
- 210000002858 crystal cell Anatomy 0.000 description 2
- 125000000753 cycloalkyl group Chemical group 0.000 description 2
- 208000028659 discharge Diseases 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 229940077844 iodine / potassium iodide Drugs 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N methanol Natural products OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 2
- 229920001643 poly(ether ketone) Polymers 0.000 description 2
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 125000003367 polycyclic group Chemical group 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000011112 polyethylene naphthalate Substances 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 229920001228 polyisocyanate Polymers 0.000 description 2
- 239000005056 polyisocyanate Substances 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 229920001955 polyphenylene ether Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000005033 polyvinylidene chloride Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000002040 relaxant effect Effects 0.000 description 2
- 238000000807 solvent casting Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920006352 transparent thermoplastic Polymers 0.000 description 2
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 2
- BQTPKSBXMONSJI-UHFFFAOYSA-N 1-cyclohexylpyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C1CCCCC1 BQTPKSBXMONSJI-UHFFFAOYSA-N 0.000 description 1
- HIDBROSJWZYGSZ-UHFFFAOYSA-N 1-phenylpyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C1=CC=CC=C1 HIDBROSJWZYGSZ-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- OFNISBHGPNMTMS-UHFFFAOYSA-N 3-methylideneoxolane-2,5-dione Chemical compound C=C1CC(=O)OC1=O OFNISBHGPNMTMS-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-M Butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Natural products CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 1
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920008347 Cellulose acetate propionate Polymers 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- GYCMBHHDWRMZGG-UHFFFAOYSA-N Methylacrylonitrile Chemical compound CC(=C)C#N GYCMBHHDWRMZGG-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- PQYJRMFWJJONBO-UHFFFAOYSA-N Tris(2,3-dibromopropyl) phosphate Chemical compound BrCC(Br)COP(=O)(OCC(Br)CBr)OCC(Br)CBr PQYJRMFWJJONBO-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- SMEGJBVQLJJKKX-HOTMZDKISA-N [(2R,3S,4S,5R,6R)-5-acetyloxy-3,4,6-trihydroxyoxan-2-yl]methyl acetate Chemical compound CC(=O)OC[C@@H]1[C@H]([C@@H]([C@H]([C@@H](O1)O)OC(=O)C)O)O SMEGJBVQLJJKKX-HOTMZDKISA-N 0.000 description 1
- 150000003926 acrylamides Chemical class 0.000 description 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 229920001893 acrylonitrile styrene Polymers 0.000 description 1
- 150000001299 aldehydes Chemical group 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 125000005907 alkyl ester group Chemical group 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 239000002519 antifouling agent Substances 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000010538 cationic polymerization reaction Methods 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000005345 chemically strengthened glass Substances 0.000 description 1
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 1
- 229940018557 citraconic acid Drugs 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000001023 inorganic pigment Substances 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
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 125000005641 methacryl group Chemical group 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- SEEYREPSKCQBBF-UHFFFAOYSA-N n-methylmaleimide Chemical compound CN1C(=O)C=CC1=O SEEYREPSKCQBBF-UHFFFAOYSA-N 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 125000003566 oxetanyl group Chemical group 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920003050 poly-cycloolefin Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920000306 polymethylpentene Polymers 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920005673 polypropylene based resin Polymers 0.000 description 1
- 229920001289 polyvinyl ether Polymers 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XHGIFBQQEGRTPB-UHFFFAOYSA-N tris(prop-2-enyl) phosphate Chemical compound C=CCOP(=O)(OCC=C)OCC=C XHGIFBQQEGRTPB-UHFFFAOYSA-N 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding 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
- G02F1/133528—Polarisers
-
- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
The present invention relates to an optical laminate and a display device using the same. Provided is an optical laminate which can be made visually recognizable regardless of the presence of polarized sunglasses even after being placed in a high-temperature environment. An optical laminate comprising, in this order, a polarizing plate and a high retardation film, wherein the polarizing plate comprises a polarizing element and a protective film laminated on the surface of the polarizing element opposite to the high retardation film, the in-plane retardation value of the high retardation film is 3000 to 30000nm, and the angle formed by the slow axis of the high retardation film and the absorption axis of the polarizing element is 40 DEGAbout 50 DEG, the absolute value of the photoelastic coefficient of the protective film is 8 multiplied by 10‑12Pa‑1The following.
Description
Technical Field
The present invention relates to an optical laminate and a display device using the same.
Background
In recent years, with the rapid spread of liquid crystal display devices, the liquid crystal display devices are increasingly used in smart phones, in car-mounted applications, and the like under strong external light. In such strong external sunlight, the liquid crystal display device may be used while wearing sunglasses (polarized sunglasses) having polarization characteristics, and when the liquid crystal display device is visually recognized across the polarized sunglasses, the liquid crystal display device may become dark depending on the direction of visual recognition, and the visual recognition may be significantly reduced.
Documents of the prior art
Patent document
Patent document 1: JP 2011-215646
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical laminate which can be made to have good visibility regardless of the presence of polarized sunglasses even after being placed in a high-temperature environment.
As a result of extensive studies, the present inventors considered that, when a liquid crystal display device in which a polymer film having a retardation value of 3000 to 30000nm (hereinafter, also simply referred to as a "high retardation film") is bonded to the surface of a polarizing plate used on the viewing side surface of the liquid crystal display device via an adhesive so that the angle formed by the absorption axis of the polarizing element and the slow axis of the polymer film becomes about 45 °, is left to stand in a high temperature environment for a long period of time, the front luminance of the liquid crystal display device in black display is increased for the following reason.
The film is stretched at a high stretch ratio at a high temperature, and cooled while maintaining the residual stress, thereby producing a high retardation film. When the polarizing plate to which such a high retardation film is obliquely laminated is stored in a high-temperature environment for a long period of time, the residual stress in the oblique direction of the high retardation film is released. This is presumably because the oblique stress is also applied to the protective film of the polarizing plate, and particularly, the protective film disposed between the polarizer and the liquid crystal display device generates a phase difference having an optical axis that is oblique to the absorption axis of the polarizer, and generates light leakage.
Based on this presumption, it was found that the above-mentioned problems can be solved and the present invention has been accomplished by using a protective film having a low photoelastic modulus and a specific value as a protective film on the liquid crystal device side. It is estimated that a protective film having a low photoelastic modulus is difficult to generate a phase difference having an optical axis obliquely.
The present invention provides an optical laminate exemplified below and a display device using the same.
[1]An optical laminate comprising a polarizing plate and a high retardation film in this order, wherein the polarizing plate comprises a polarizing element and a protective film laminated on the surface of the polarizing element opposite to the high retardation film, the high retardation film has an in-plane retardation of 3000 to 30000nm, the high retardation film has a slow axis forming an angle of 40 to 50 DEG with an absorption axis of the polarizing element, and the protective film has a photoelastic coefficient of 8 x 10 in absolute value-12Pa-1The following.
[2] The optical laminate according to [1], wherein the protective film comprises at least one selected from the group consisting of a (meth) acrylic resin, a polystyrene resin, and a maleimide resin.
[3] The optical laminate according to [1], wherein the protective film comprises a cycloolefin-based resin.
[4] The optical laminate according to any one of [1] to [3], wherein the protective film has an in-plane retardation value of 10nm or less.
[5] The optical laminate according to any one of [1] to [3], wherein the protective film has an in-plane retardation value of 50nm to 300 nm.
[6] The optical laminate according to any one of [1] to [5], wherein the thickness of the high retardation film is 200 μm or less.
[7] The optical laminate according to any one of [1] to [6], wherein the high retardation film and the polarizing plate are laminated with an adhesive layer interposed therebetween.
[8] A display device comprising a display element and the optical laminate according to any one of [1] to [7] laminated thereon.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, an optical laminate which can be made visually recognizable regardless of the presence of polarized sunglasses even after being placed in a high-temperature environment can be provided.
Drawings
Fig. 1 is a schematic cross-sectional view showing an example of a layer structure of an optical laminate.
Fig. 2 is a schematic cross-sectional view showing an example of the layer structure of an optical laminate obtained by laminating front panels.
Description of reference numerals
1 a polarizing plate,
4 a front panel,
10 a polarizing element,
11 the 1 st protective film,
12 the 2 nd protective film,
13 a high retardation film,
14. 15, 16 adhesive layers,
100 optical stack.
Detailed Description
(definition of wording and notation)
The terms and symbols in the present specification are defined as follows.
(1) Refractive index (nx, ny, nz)
"nx" is a refractive index in a direction in which an in-plane refractive index becomes maximum (i.e., a slow axis direction), "ny" is a refractive index in a direction orthogonal to the slow axis in the plane, and "nz" is a refractive index in a thickness direction.
(2) Phase difference in plane
The in-plane retardation (Re [ lambda ]) means the in-plane retardation of the film at 23 ℃ and a wavelength [ lambda ] (mm). When the film thickness is d (mm), Re [ λ ] is determined by Re [ λ ] ═ nx-ny × d.
(3) Phase difference value in thickness direction
The retardation value in the thickness direction (Rth [ lambda ]) means the retardation value in the thickness direction of the film at 23 ℃ and a wavelength lambda (nm). When the film thickness is d (nm), Rth [ λ ] is determined by Rth [ λ ] (nx + ny)/2-nz) × d.
< optical layered body >
The optical laminate of the present invention includes a polarizing plate and a high retardation film in this order. The polarizing element and the protective film constituting the polarizing plate can be laminated via an adhesive layer, for example. Examples of the adhesive layer include an adhesive layer and an adhesive layer described later.
An example of the layer structure of the optical laminate of the present invention will be described below with reference to fig. 1. In fig. 1, an adhesive layer for bonding the polarizer 10 and the protective films 11 and 12 to each other is not shown. The optical laminate 100 shown in fig. 1 has a layer structure in which a polarizing plate 1 and a high retardation film 13 are laminated via an adhesive layer 14, wherein the polarizing plate 1 is obtained by laminating a1 st protective film 11 on one surface of a polarizing element 10 and a 2 nd protective film 12 on the other surface of the polarizing element 10. The optical laminate 100 further includes an adhesive layer 15 on the surface of the 1 st protective film 11 opposite to the polarizer 10. The adhesive layer 15 may be an adhesive layer for bonding to a display element or the like.
< polarizing plate >
In the present invention, the polarizing plate is a laminate comprising a polarizing element and at least 1 protective film. The protective film provided in the polarizing plate may have a surface treatment layer such as a hard coat layer, an antireflection layer, and an antistatic layer, which will be described later. The polarizing element and the protective film can be laminated via an adhesive layer or an adhesive layer, for example. The following describes members provided in the polarizing plate.
(1) Polarizing element
The polarizer 10 included in the polarizing plate 1 may be an absorption-type polarizer, and has a property of absorbing linearly polarized light having a vibration plane parallel to the absorption axis thereof and transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis). As the polarizing element 10, a polarizing element in which a uniaxially stretched polyvinyl alcohol resin film is adsorbed with a dichroic dye and oriented can be suitably used. The polarizing element 10 can be manufactured, for example, by a method including the steps of: a step of uniaxially stretching a polyvinyl alcohol resin film; a step of dyeing the polyvinyl alcohol resin film with a dichroic dye to thereby adsorb the dichroic dye; a step of treating the polyvinyl alcohol resin film having the dichroic dye adsorbed thereon with a crosslinking liquid such as an aqueous boric acid solution; and a step of washing with water after the treatment with the crosslinking solution.
As the polyvinyl alcohol resin, a product obtained by saponifying a polyvinyl acetate resin can be used. Examples of the polyvinyl acetate resin include polyvinyl acetate which is a polymer of vinyl acetate alone, and copolymers with other monomers copolymerizable with vinyl acetate. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides having an ammonium group, and the like.
The "(meth) acryl group" as used herein means at least one selected from an acryl group and a methacryl group. The same applies to "(meth) acryloyl group", "meth) acrylate", and the like.
The saponification degree of the polyvinyl alcohol resin is usually 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and for example, polyvinyl formal, polyvinyl acetal, or the like modified with aldehydes can be used. The polyvinyl alcohol resin has an average polymerization degree of usually 1000 to 10000, preferably 1500 to 5000. The average degree of polymerization of the polyvinyl alcohol resin can be determined in accordance with JIS K6726.
The film obtained by forming such a polyvinyl alcohol resin into a film is used as a raw material film for a polarizing element. The method for forming the film from the polyvinyl alcohol resin is not particularly limited, and a known method is employed. The thickness of the polyvinyl alcohol-based base film is not particularly limited, and for example, a roll film of 40 to 75 μm is preferably used so that the thickness of the polarizing element is 25 μm or less. More preferably 45 μm or less.
The uniaxial stretching of the polyvinyl alcohol resin film can be performed before, simultaneously with, or after the dyeing of the dichroic dye. In the case where the uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before or during the crosslinking treatment. In addition, uniaxial stretching may be performed in these plural stages.
The stretching may be performed uniaxially between rollers having different peripheral speeds or uniaxially using a heat roller every uniaxial stretching. The uniaxial stretching may be dry stretching in which stretching is performed in the air, or wet stretching in which stretching is performed in a state where the polyvinyl alcohol resin film is swollen with a solvent or water. The draw ratio is usually 3 to 8 times.
As a method for dyeing a polyvinyl alcohol resin film with a dichroic dye, for example, a method of immersing the film in an aqueous solution containing a dichroic dye is employed. Iodine or a dichroic organic dye is used as the dichroic dye. The polyvinyl alcohol resin film is preferably subjected to an immersion treatment in water before the dyeing treatment.
As the crosslinking treatment after dyeing with the dichroic dye, a method of immersing a dyed polyvinyl alcohol resin film in an aqueous solution containing boric acid is generally employed. When iodine is used as the dichroic dye, the aqueous solution containing boric acid preferably contains potassium iodide.
The thickness of the polarizing element is usually 50 μm or less, preferably 5 to 30 μm, more preferably 5 to 25 μm or less, and further preferably 5 to 20 μm or less. By setting the thickness of the polarizing element in these ranges, it is possible to prevent breakage, cracks, and the like during the production of the polarizing element, maintain easy workability, and achieve high optical characteristics at the same time. Further, by setting the thickness of the polarizing element to 20 μm or less, the deterioration of the visibility when exposed to a high temperature environment can be further suppressed.
As the polarizing element, for example, a polarizing element in which a dichroic dye is aligned in a cured film obtained by polymerizing a liquid crystal compound can be used as described in japanese patent application laid-open No. 2016-170368. As the dichroic dye, a dye having absorption in a wavelength range of 380 to 800nm can be used, and an organic dye is preferably used. Examples of the dichroic dye include azo compounds. The liquid crystal compound is a liquid crystal compound that can be polymerized while maintaining its alignment, and can have a polymerizable group in the molecule. Further, as described in WO2011/024891, the polarizing element may be formed from a dichroic dye having liquid crystal properties.
(2) Protective film
The polarizing plate 1 used in the present invention has: a polarizing element 10; and a1 st protective film 11 laminated on a surface of the polarizing element 10 opposite to the high retardation film 13 side. The polarizing plate 1 may have at least 1 protective film corresponding to the 1 st protective film 11, and may further have another protective film corresponding to the 2 nd protective film 12 laminated on the surface of the polarizing element 10 on the high retardation film 13 side.
(No. 1 protective film 11)
The absolute value of photoelastic coefficient of the 1 st protective film 11 at 23 ℃ is 8X 10-12Pa-1The following. By using the 1 st protective film 11 having a small photoelastic coefficient, the phase difference value found by the deformation of the 1 st protective film 11 caused by the shrinkage stress of the high retardation film 13 when exposed to a high temperature environment is small, and as a result, it is considered that the visibility can be improved regardless of the presence or absence of the polarized sunglasses even after exposed to a high temperature environment.
The 1 st protective film 11 is not particularly limited, but may have an absolute value including a photoelastic coefficient of 8 × 10- 12Pa-1The following films of a light-transmitting (preferably optically transparent) thermoplastic resin, for example: polyolefin-based resins such as chain polyolefin-based resins (polypropylene-based resins, etc.) and cyclic polyolefin-based resins (norbornene-based resins, etc.); cellulose resins such as triacetyl cellulose and diacetyl cellulose; polyester resins such as polyethylene terephthalate and polybutylene terephthalate; a polycarbonate-based resin; (meth) acrylic resins such as methyl methacrylate resins; a polystyrene-based resin; a polyvinyl chloride resin; acrylonitrile-butadiene-styrene resins; acrylonitrile styrene resin; acetic acidA vinyl ester resin; a polyvinylidene chloride resin; a polyamide resin; a polyacetal resin; modified polyphenylene ether resin; a polysulfone-based resin; a polyether sulfone-based resin; a polyarylate-based resin; a polyamide imide resin; a polyimide-based resin; maleimide resins, and the like.
In particular, the 1 st protective film 11 is preferably a protective film having a small photoelastic coefficient. That is, it is preferable to use a film containing at least one selected from the group consisting of a cyclic polyolefin resin, (meth) acrylic resin, polystyrene resin, and maleimide resin.
The photoelastic coefficient of the 1 st protective film 11 at 23 ℃ is preferably 0.05X 10-12～8.0×10-12Pa-1More preferably 0.1X 10-12～5.0×10-12Pa-1More preferably 0.2X 10-12～3.0×10-12Pa-1. The photoelastic coefficient is a value measured by the method described in the examples described later.
As long as the photoelastic coefficient is within the above range, the in-plane retardation of the protective film 11 is preferably adjusted to 10nm or less or 50 to 300 nm. Particularly, a film having a thickness of 10nm or less is preferable, whereby higher effects can be obtained. This is based on the following estimation: the film having a retardation has a phase difference value changed by stress relaxation in an oblique direction of the high retardation film, and also has an optical axis changed, whereby light leakage at the time of black display becomes large. When a retardation film is used as an optical compensation film in a liquid crystal display device or the like, it is also a useful design means to dispose the optical compensation film in another 1 polarizing plate used as a pair. The retardation value is a value at a wavelength of 550nm, and is a value measured by the method described in the examples described later, unless otherwise specified.
The cyclic polyolefin resin is a general term for resins obtained by polymerizing a cyclic olefin as a polymerization unit, and examples thereof include resins described in Japanese patent application laid-open Nos. 1-240517, 3-14882, and 3-122137. Specific examples of the cyclic polyolefin resin include ring-opened (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins with linear olefins such as ethylene and propylene (typically random copolymers), graft polymers obtained by modifying these with unsaturated carboxylic acids or derivatives thereof, and hydrogenated products of these. Among these, norbornene-based resins using a norbornene-based monomer such as norbornene or polycyclic norbornene-based monomers as cyclic olefin are preferably used.
The method for producing the protective film from the cycloolefin-based resin is not particularly limited, and a method corresponding to the resin may be appropriately selected. For example, the following are employed: a solvent casting method in which a resin dissolved in a solvent is cast onto a metal belt or drum, and the solvent is dried and removed to obtain a film; and a melt extrusion method in which a resin is heated to a temperature equal to or higher than its melting temperature, kneaded, extruded through a die, and cooled by a cooling drum, thereby obtaining a film. Among these, the melt extrusion method is preferably employed from the viewpoint of productivity.
The cycloolefin resin film has an in-plane retardation value Re 550 at a wavelength of 550nm of preferably 10nm or less, more preferably 7nm or less, further preferably 5nm or less, particularly preferably 3nm or less, and most preferably 1nm or less. The thickness-direction retardation value Rth [550] of the cycloolefin-based resin film at a wavelength of 550nm is preferably 15nm or less, more preferably 10nm or less, further preferably 5nm or less, particularly preferably 3nm or less, and most preferably 1nm or less.
Next, a method for controlling the phase difference value of the cycloolefin resin film so as to satisfy the above-described condition will be described. In order to make the in-plane retardation value 10nm or less, it is necessary to make the deformation in stretching that remains in the in-plane direction as small as possible, and in order to make the thickness direction retardation value less than the value specified in the present invention, it is necessary to make the deformation that remains in the thickness direction as small as possible.
For example, in the solvent casting method, a method of relaxing residual tensile strain in the in-plane direction and residual shrinkage strain in the thickness direction, which are generated when the casting resin solution is dried, by heat treatment, or the like is employed. In the melt extrusion method, the following method is employed: in order to prevent the resin film from being stretched until it is cooled by extruding the resin film from a die, the distance from the die to a cooling drum is shortened as much as possible, and the extrusion amount and the rotation speed of the cooling drum are controlled so that the film is not stretched. In addition, a method of relaxing residual strain in a film obtained in the same manner as in the melt extrusion method by heat treatment is also used.
In addition, a retardation film having a function as an optical compensation film of a liquid crystal display device in a range satisfying the photoelastic coefficient of the present invention may be used. Such a retardation film can be produced by stretching the cycloolefin resin film to impart an in-plane retardation value. The stretching may be performed by known longitudinal uniaxial stretching, tenter transverse uniaxial stretching, simultaneous biaxial stretching, sequential biaxial stretching, or the like, and may be performed so as to obtain a desired retardation value.
For example, in an in-plane switching mode liquid crystal display device, a retardation film is preferably used, the in-plane retardation of which is adjusted to 50 to 300 nm. Specifically, a retardation film described in japanese patent application laid-open No. 2010-20287, a retardation film described in japanese patent 3880996, or the like can be used.
The thickness of the cycloolefin resin film is preferably 10 to 200. mu.m, more preferably 10 to 100. mu.m, and most preferably 10 to 65 μm. If the thickness is less than 10 μm, the strength may be lowered. If the thickness exceeds 200. mu.m, the transparency may be lowered.
The (meth) acrylic resin is a resin containing a compound having a (meth) acryloyl group as a main constituent monomer. Specific examples of the (meth) acrylic resin include, for example: poly (meth) acrylates such as polymethyl methacrylate; methyl methacrylate- (meth) acrylic acid copolymer; methyl methacrylate- (meth) acrylate copolymers; methyl methacrylate-acrylate- (meth) acrylic acid copolymer; methyl (meth) acrylate-styrene copolymers (MS resins and the like); copolymers of methyl methacrylate and a compound having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate- (meth) acrylic acid norbornyl ester copolymer, etc.). Poly (meth) acrylic acid C such as poly (methyl (meth) acrylate) is preferably used1-6The polymer containing an alkyl ester as a main component is preferably 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 film has an in-plane retardation value Re 550 at a wavelength of 550nm of preferably 10nm or less, more preferably 7nm or less, still more preferably 5nm or less, particularly preferably 3nm or less, and most preferably 1nm or less. The thickness direction retardation value Rth [550] of the (meth) acrylic resin film at a wavelength of 550nm is preferably 15nm or less, more preferably 10nm or less, still more preferably 5nm or less, particularly preferably 3nm or less, and most preferably 1nm or less. In order to set the in-plane retardation and the thickness direction retardation within such ranges, for example, a (meth) acrylic resin having a glutarimide structure described later can be used.
The (meth) acrylic resin may further have other structural units. Examples of the other structural units include structural units constituting a lactone ring, polycarbonate, polyvinyl alcohol, cellulose acetate, polyester, polyarylate, polyimide, polyolefin, and the like, and structural units represented by the general formula (1) described later. Examples of the structural unit that exhibits negative birefringence include structural units derived from styrene monomers, maleimide monomers, and the like, structural units of polymethyl methacrylate, structural units represented by the general formula (3) described later, and the like.
As the (meth) acrylic resin, a (meth) acrylic resin having a lactone ring structure or a glutarimide structure is preferably used. The (meth) acrylic resin having a lactone ring structure or a glutarimide structure is excellent in heat resistance. More preferably a (meth) acrylic resin having a glutarimide structure. When a (meth) acrylic resin having a glutarimide structure is used, a (meth) acrylic resin film having low moisture permeability and small retardation and ultraviolet transmittance can be obtained as described above. (meth) acrylic resins having a glutarimide structure (hereinafter also referred to as glutarimide resins) are described in, for example, Japanese patent application laid-open Nos. 2006-. These descriptions are incorporated herein by reference.
Preferably, the glutarimide resin contains a structural unit represented by the following general formula (1) (hereinafter also referred to as a glutarimide unit) and a structural unit represented by the following general formula (2) (hereinafter also referred to as a (meth) acrylate unit).
[ chemical formula 1]
In the formula (1), R1And R2Each independently hydrogen or C1-C8 alkyl, R3Is a substituent containing hydrogen, alkyl group having 1 to 18 carbon atoms, cycloalkyl group having 3 to 12 carbon atoms or aromatic ring having 5 to 15 carbon atoms. In the formula (2), R4And R5Each independently hydrogen or C1-C8 alkyl, R6Is a substituent containing hydrogen, alkyl group having 1 to 18 carbon atoms, cycloalkyl group having 3 to 12 carbon atoms or aromatic ring having 5 to 15 carbon atoms.
The glutarimide resin may further contain a structural unit (hereinafter also referred to as an aromatic vinyl unit) represented by the following general formula (3) as needed.
[ chemical formula 2]
In the formula (3), R7Is hydrogen or C1-C8 alkyl, R8Is an aryl group having 6 to 10 carbon atoms.
In the above general formula (1), preferably, R1And R2Each independently is hydrogen or methyl, R3Is hydrogen, methyl, butyl or cyclohexyl, further preferably R1Is methyl, R2Is hydrogen, R3Is methyl.
The above glutarimide resin may contain only a single type as a glutarimide unit, or may contain R in the above general formula (1)1、R2And R3A plurality of different categories.
Glutarimide units can be formed by imidizing (meth) acrylate units characterized by the above general formula (2). Alternatively, the glutarimide unit may be prepared by reacting an acid anhydride such as maleic anhydride or a half ester of such an acid anhydride with a linear or branched alcohol having 1 to 20 carbon atoms; and α, β -olefin unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic anhydride, itaconic acid, itaconic anhydride, crotonic acid, fumaric acid, and citraconic acid.
In the above general formula (2), preferably, R4And R5Each independently is hydrogen or methyl, R6Is hydrogen or methyl, further preferably, R4Is hydrogen, R5Is methyl, R6Is methyl.
The glutarimide resin may contain only a single type as a (meth) acrylate ester unit, or may contain R in the general formula (2)4、R5And R6A plurality of different categories.
The above glutarimide resin preferably contains styrene, α -methylstyrene, or the like, and further preferably contains styrene as the aromatic vinyl unit represented by the above general formula (3). By having such an aromatic vinyl unit, the positive birefringence of the glutarimide structure is reduced, and thus a (meth) acrylic resin film having a low phase difference can be obtained.
The above glutarimide resin may contain only a single species, or may contain R7And R8A plurality of different types as aromatic vinyl units.
The content of the above glutarimide unit in the above glutarimide resin is preferably dependent on R3And the like. The content of glutarimide units is as the glutarimide treeThe total structural unit of the fat is preferably 1 to 80% by weight, more preferably 1 to 70% by weight, still more preferably 1 to 60% by weight, and particularly preferably 1 to 50% by weight. When the content of the glutarimide unit is in such a range, a (meth) acrylic resin film having a low retardation and excellent heat resistance can be obtained.
The content of the aromatic vinyl unit in the glutarimide resin can be appropriately set according to the purpose and the desired characteristics. The content of the aromatic vinyl unit may be 0 depending on the use. When the aromatic vinyl unit is contained, the content thereof is preferably 10 to 80% by weight, more preferably 20 to 80% by weight, further preferably 20 to 60% by weight, and particularly preferably 20 to 50% by weight, based on the glutarimide unit of the glutarimide resin. When the content of the aromatic vinyl unit is in such a range, a (meth) acrylic resin film having a low phase difference and excellent heat resistance and mechanical strength can be obtained.
In the above-mentioned glutarimide resin, if necessary, a structural unit other than the glutarimide unit, the (meth) acrylate ester unit, and the aromatic vinyl unit may be further copolymerized. Examples of the other structural units include structural units containing nitrile monomers such as acrylonitrile and methacrylonitrile, and maleimide monomers such as maleimide, N-methylmaleimide, N-phenylmaleimide and N-cyclohexylmaleimide. These other structural units may be directly copolymerized or graft-copolymerized in the above glutarimide resin.
The (meth) acrylic resin film may contain any suitable additive according to the purpose. Examples of the additive include hindered phenol-based, phosphorus-based, and sulfur-based antioxidants; stabilizers such as light-resistant stabilizers, ultraviolet absorbers, weather-resistant stabilizers, and heat stabilizers; reinforcing agents such as glass fibers and carbon fibers; a near infrared ray absorber; flame retardants such as tris (dibromopropyl) phosphate, triallyl phosphate, and antimony oxide; antistatic agents such as anionic, cationic and nonionic surfactants; colorants such as inorganic pigments, organic pigments, and dyes; organic fillers, inorganic fillers; a resin modifier; a plasticizer; a lubricant; a retardation reducing agent, etc. The kind, combination, content and the like of the additives contained can be appropriately set in accordance with the purpose and desired characteristics.
The method for producing the (meth) acrylic resin film is not particularly limited, and for example, the (meth) acrylic resin can be thoroughly mixed with an ultraviolet absorber and, if necessary, other polymers or additives by any suitable mixing method, and the resulting mixture can be preliminarily molded into a thermoplastic resin composition and then the film can be formed. Alternatively, the (meth) acrylic resin, the ultraviolet absorber, and if necessary, other polymers or additives may be separately prepared into separate solutions, mixed to form a uniform mixed solution, and then subjected to film formation.
In order to produce the thermoplastic resin composition, the film raw materials are premixed by any suitable mixer such as an all-directional mixer, and the resulting mixture is extruded and kneaded. In this case, the mixer used for extrusion kneading is not particularly limited, and any suitable mixer such as an extruder such as a single-screw extruder or a twin-screw extruder, a pressure kneader, or the like can be used.
Examples of the film forming method include solution casting, melt extrusion, calendering, compression molding, and any suitable film forming method. Melt extrusion is preferred. The melt extrusion method does not use a solvent, and therefore, can reduce the production cost and the burden on the global environment or the work environment due to the solvent.
Examples of the melt extrusion method include a T-die method and a blow molding method. The molding temperature is preferably 150 to 350 ℃, and more preferably 200 to 300 ℃.
In the case of film formation by the T-die method, a T-die is attached to the tip of a known single-screw extruder or twin-screw extruder, and the film extruded into a film shape is wound to obtain a roll-shaped film. In this case, the temperature of the winding roll is appropriately adjusted to apply stretching in the extrusion direction, thereby performing uniaxial stretching. Further, by stretching the film in a direction perpendicular to the extrusion direction, simultaneous biaxial stretching, sequential biaxial stretching, or the like can be performed.
The (meth) acrylic resin film may be either an unstretched film or a stretched film as long as the desired retardation can be obtained. In the case of the stretched film, the stretched film may be either a uniaxially stretched film or a biaxially stretched film. In the case of the biaxially stretched film, the biaxially stretched film may be either a simultaneously biaxially stretched film or a sequentially biaxially stretched film.
The stretching temperature is preferably in the vicinity of the glass transition temperature of the thermoplastic resin composition as a film material, more specifically, preferably in the range of (glass transition temperature-30 ℃) to (glass transition temperature +30 ℃), and still more preferably in the range of (glass transition temperature-20 ℃) to (glass transition temperature +20 ℃). If the stretching temperature is insufficient (glass transition temperature-30 ℃), the haze of the obtained film may be increased, or the film may be cracked or cracked, and a predetermined stretching ratio may not be obtained. On the other hand, when the stretching temperature exceeds (glass transition temperature +30 ℃), the resulting film tends to have large thickness unevenness, or to have insufficient improvement in mechanical properties such as elongation, tear propagation strength, and flex fatigue resistance. Further, a failure such as adhesion of the film to the roller tends to occur.
The stretching ratio is preferably 1.1 to 3 times, and more preferably 1.3 to 2.5 times.
When the stretch ratio is in such a range, the mechanical properties of the film, such as elongation, tear propagation strength, and flex fatigue resistance, can be greatly improved. As a result, a film having small thickness unevenness, substantially zero birefringence (thus small retardation), and further small haze can be produced.
The (meth) acrylic resin film may be subjected to a heat treatment (annealing) after the stretching treatment in order to stabilize the optical isotropy and mechanical properties. The conditions for the heat treatment can be any suitable conditions.
The thickness of the (meth) acrylic resin film is preferably 10 to 200. mu.m, more preferably 15 to 100. mu.m, and most preferably 15 to 65 μm. If the thickness is less than 10 μm, the strength may be lowered. If the thickness exceeds 200. mu.m, the transparency may be lowered.
(No. 2 protective film 12)
As the 2 nd protective film 12, the resin film described above as a film that can be used as the 1 st protective film 11 may be used, or another resin film may be used. For example, a chain olefin resin film or a cellulose resin film is preferably used.
Examples of the chain polyolefin resin include a single polymer of a chain olefin such as a polyethylene resin (a polyethylene resin that is a single polymer of ethylene or a copolymer mainly composed of ethylene) and a polypropylene resin (a polypropylene resin that is a single polymer of propylene or a copolymer mainly composed of propylene), and a copolymer containing 2 or more kinds of chain olefins.
The cellulose ester resin is an ester of cellulose and a fatty acid. Specific examples of the cellulose ester resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate. Further, copolymers thereof and products in which a part of the hydroxyl groups is modified with another substituent are also included. Among these, cellulose triacetate (triacetyl cellulose) is also particularly preferable.
The thickness of the 2 nd protective film 12 is usually 1 to 100 μm, but from the viewpoint of strength, handling property, etc., it is preferably 5 to 60 μm, more preferably 10 to 55 μm, and still more preferably 15 to 50 μm.
As described above, the 2 nd protective film 12 may have a surface treatment layer (coating layer) such as a hard coat layer, an antiglare layer, a light diffusion layer, an antireflection layer, a low refractive index layer, an antistatic layer, and an antifouling layer on its outer surface (surface opposite to the polarizing element). In addition, the thickness of the 2 nd protective film 12 includes the thickness of the surface treatment layer.
(3) Adhesive layer
The protective films (the 1 st protective film 11 and the 2 nd protective film 12) can be bonded to the polarizing element with an adhesive layer interposed therebetween, for example. The adhesive layer can be, for example, an adhesive layer or an adhesive layer. As the adhesive for forming the adhesive layer, an aqueous adhesive, an active energy ray-curable adhesive or a thermosetting adhesive can be used, and an aqueous adhesive or an active energy ray-curable adhesive is preferable.
As the pressure-sensitive adhesive layer, a pressure-sensitive adhesive layer described later can be used.
Examples of the water-based adhesive include an adhesive containing a polyvinyl alcohol resin aqueous solution, a water-based two-component polyurethane emulsion adhesive, and the like. Among these, an aqueous adhesive containing an aqueous solution of a polyvinyl alcohol resin is suitably used. As the polyvinyl alcohol resin, not only a vinyl alcohol homopolymer obtained by saponifying polyvinyl acetate, which is a polymer of vinyl acetate alone, but also a polyvinyl alcohol copolymer obtained by saponifying a copolymer of vinyl acetate and another monomer copolymerizable therewith, a modified polyvinyl alcohol polymer obtained by partially modifying hydroxyl groups thereof, and the like can be used. The aqueous adhesive may contain a crosslinking agent such as an aldehyde compound (e.g., glyoxal), an epoxy compound, a melamine compound, a methyl alcohol compound, an isocyanate compound, an amine compound, or a polyvalent metal salt.
When an aqueous adhesive is used, it is preferable to perform a drying step for removing water contained in the aqueous adhesive after the polarizing element and the protective film are bonded. After the drying step, a curing step of curing at a temperature of, for example, 20 to 45 ℃ may be provided.
The active energy ray-curable adhesive is an adhesive containing a curable compound that is cured by irradiation with an active energy ray such as an ultraviolet ray, a visible light, an electron beam, or an X-ray, and is preferably an ultraviolet ray-curable adhesive.
The curable compound may be a cationically polymerizable curable compound or a radically polymerizable curable compound. Examples of the cationically polymerizable curable compound include an epoxy compound (a compound having 1 or 2 or more epoxy groups in the molecule), an oxetane compound (a compound having 1 or 2 or more oxetane rings in the molecule), and a combination thereof. Examples of the radically polymerizable curable compound include a (meth) acrylic compound (a compound having 1 or 2 or more (meth) acryloyloxy groups in the molecule), another vinyl compound having a radically polymerizable double bond, and a combination thereof. The cationically polymerizable curable compound and the radically polymerizable curable compound may be used in combination. The active energy ray-curable adhesive usually further contains a cationic polymerization initiator and/or a radical polymerization initiator for starting the curing reaction of the curable compound.
In order to improve the adhesiveness, at least one of the surfaces to be bonded of the polarizing element and the protective film may be subjected to a surface activation treatment each time the polarizing element and the protective film are bonded. Examples of the surface activation treatment include dry treatments such as corona treatment, plasma treatment, discharge treatment (glow discharge treatment, etc.), flame treatment, ozone treatment, UV ozone treatment, and ionizing active ray treatment (ultraviolet ray treatment, electron beam treatment, etc.); and wet treatments such as ultrasonic treatment, saponification treatment, and anchor coating treatment using a solvent such as water or acetone. These surface-activating treatments may be carried out alone or in combination of 2 or more.
When the protective films are bonded to both surfaces of the polarizing element, the adhesives used for bonding the protective films may be the same type of adhesive or different types of adhesives.
In the optical laminate of the present invention, a high retardation film may be directly laminated on the polarizing element 10 with the adhesive 14 interposed therebetween. In this case, the 2 nd protective film 12 can be omitted.
< high retardation film 13>
The optical laminate of the present invention has a high retardation film 13 in order to ensure visibility across polarized sunglasses. The high retardation film 13 includes a transparent thermoplastic resin film having birefringence. In the present specification, the term "high retardation" means that the in-plane retardation Re 550 at a wavelength of 550nm is 3000nm or more. The in-plane retardation value Re 550 of the high retardation film 13 at a wavelength of 550nm is preferably 3000nm or more, more preferably 5000nm or more, and particularly preferably 7000nm or more. The upper limit of the in-plane retardation Re 550 of the high retardation film 13 is 30000 nm. By using such a film, it is possible to suppress a change in hue according to a viewing angle when the liquid crystal display device is visually recognized across polarized sunglasses.
The high retardation film 13 is obtained by, for example, stretching a thermoplastic resin film. Specific examples of the thermoplastic resin include polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins such as norbornene polymers; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth) acrylic resins such as (meth) acrylic acid and polymethyl (meth) acrylate; cellulose ester resins such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; a polycarbonate-based resin; a polystyrene-based resin; a polyarylate-based resin; a polysulfone-based resin; a polyether sulfone-based resin; a polyamide resin; a polyimide-based resin; a polyether ketone resin; polyphenylene sulfide-based resin; polyphenylene ether resins, and mixtures and copolymers thereof. Polyethylene terephthalate, cellulose ester, cycloolefin resin, or polycarbonate is preferable from the viewpoint of ease of handling and transparency.
These thermoplastic resins may be subjected to uniaxial or biaxial thermal stretching treatment to form a film having a desired phase difference. The stretching ratio is usually 1.1 to 6 times, preferably 1.1 to 4 times.
In addition, in order to enable roll-to-roll production, a method of obliquely stretching is also preferably used. The method of obliquely stretching is not particularly limited as long as the orientation axis can be continuously tilted to a desired angle, and a known stretching method can be employed. Examples of such a drawing method include the methods described in Japanese patent application laid-open Nos. 50-83482 and 2-113920. When a retardation is imparted to a film by stretching, the thickness after stretching is determined by the thickness before stretching and the stretching magnification.
The angle formed by the slow axis of the high retardation film 13 and the absorption axis of the polarizer 10 is 40 ° to 50 °, more preferably 42 ° to 48 °, and still more preferably about 45 °. This makes it possible to suppress a reduction in front luminance when the liquid crystal display device is visually recognized across polarized sunglasses.
The thickness of the high retardation film 13 is preferably 200 μm or less, more preferably 150 μm or less, and particularly preferably 100 μm or less. By setting the thickness of the high retardation film 13 to 200 μm or less, curling of the optical laminate 100 can be suppressed, and defects such as entry of bubbles when the optical laminate is bonded to a liquid crystal display device can be suppressed. The thickness of the high retardation film 13 may be 10 μm or more, or 30 μm or more.
By providing the optical laminate 100 on the viewer side of the liquid crystal cell of the liquid crystal display device, it is possible to suppress a decrease in visibility when the liquid crystal display device is viewed through polarized sunglasses without additionally requiring a film having a high retardation. Specifically, a decrease in front luminance and a change in hue (color shift) according to the viewing angle can be suppressed. The high retardation film 13 may be laminated with a hard coat layer or an antiglare layer as needed.
< adhesive layer 14>
The adhesive layer 14 laminates the polarizing plate 1 and the high retardation film 13. The pressure-sensitive adhesive layer 14 may contain a pressure-sensitive adhesive composition containing a resin such as a (meth) acrylic resin, a rubber resin, a urethane resin, an ester resin, a silicone resin, or a polyvinyl ether resin as a main component. Among these, a pressure-sensitive adhesive composition containing a (meth) acrylic resin excellent in transparency, weather resistance, heat resistance and the like as a base polymer is preferable. The adhesive composition may be an active energy ray-curable type or a heat-curable type. The thickness of the adhesive layer is usually 3 to 30 μm, preferably 3 to 25 μm.
As the (meth) acrylic resin (base polymer) used in the adhesive composition, for example, a polymer or copolymer in which 1 or 2 or more kinds of (meth) acrylic esters such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate are used as monomers is preferably used. In the base polymer, it is preferable to copolymerize a polar monomer. Examples of the polar monomer include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N-dimethylaminoethyl (meth) acrylate, and glycidyl (meth) acrylate.
The adhesive composition may contain only the above-mentioned base polymer, but usually further contains a crosslinking agent. Examples of crosslinking agents include: a crosslinking agent which is a metal ion having a valence of 2 or more and forms a metal carboxylate salt with a carboxyl group; a cross-linking agent which is a polyamine compound and forms an amide bond with a carboxyl group; is a polyepoxy compound or a polyol, a crosslinking agent forming an ester bond with a carboxyl group; is a polyisocyanate compound and a crosslinking agent which forms an amide bond with a carboxyl group. Among these, polyisocyanate compounds are preferred.
The storage modulus of the adhesive layer 14 is preferably 0.001 to 0.350MPa, more preferably 0.001 to 0.200MPa, still more preferably 0.001 to 0.100MPa, and particularly preferably 0.010 to 0.100MPa at a frequency of 1Hz and a temperature of 23 ℃. If the storage modulus exceeds the above range, the relaxation of the shrinkage stress of the high retardation film 13 in a high temperature environment is insufficient, and the 1 st protective film 11 is deformed, so that the normal visibility of the polarized sunglasses is not degraded. If the content is less than the above range, peeling or the like may occur in a high-temperature environment.
The thickness of the adhesive layer 14 is preferably 5 to 200 μm, more preferably 7 to 100 μm, further preferably 8 to 80 μm, and particularly preferably 10 to 50 μm.
< display device >
The optical laminate of the present invention can be used to form a liquid crystal display device by laminating liquid crystal cells with a pressure-sensitive adhesive 15 interposed therebetween. As the adhesive 15, an adhesive described as the above-mentioned composition, characteristics, and thickness of the adhesive 14 can be used, and may be the same as or different from the adhesive layer 14.
< front Panel >
The optical stack 100 may be used by disposing a front plate on the visual recognition side surface thereof. The front panel can be laminated on the optical laminate 100 via an adhesive layer. Examples of the adhesive layer include the adhesive layer and the adhesive layer described above. Fig. 2 is a cross-sectional view showing the structure of a laminate in which the front panel 4 is disposed on the viewing side surface of the optical laminate 100. As shown in fig. 2, the front panel 4 can be laminated on the high retardation film 13 of the optical laminate 100 via the pressure-sensitive adhesive layer 16.
Examples of the front panel include a structure in which at least one surface of glass or a resin film includes a hard coat layer. As the glass, for example, high-permeability glass or tempered glass can be used. In particular, when a thin transparent surface material is used, chemically strengthened glass is preferable. The thickness of the glass can be set to, for example, 100 μm to 5 mm.
A front panel including a hard coat layer on at least one surface of a resin film may have a soft characteristic rather than being as hard as conventional glass. The thickness of the hard coat layer is not particularly limited, and may be, for example, 5 to 100 μm.
As the resin film, a film formed of the following polymers may be used: a cycloolefin derivative having a monomer unit containing a cycloolefin such as norbornene or polycyclic norbornene, a cellulose (diacetylcellulose, triacetylcellulose, acetylcellulose butyrate, isobutylcellulose, propionylcellulose, butyrylcellulose, acetylpropionylcellulose), an ethylene-vinyl acetate copolymer, a polycycloolefin, a polyester, a polystyrene, a polyamide, a polyetherimide, a polyacrylic acid, a polyimide, a polyamideimide, a polyethersulfone, a polysulfone, a polyethylene, a polypropylene, a polymethylpentene, a polyvinyl chloride, a polyvinylidene chloride, a polyvinyl alcohol, a polyvinyl acetal, a polyetherketone, a polyether ether ketone, a polymethyl methacrylate, a polyethylene terephthalate, a polybutylene terephthalate, a polyethylene naphthalate, a polycarbonate, a polyurethane, a cyclo-oxygen, or the like. The resin film can be an unstretched, uniaxially stretched or biaxially stretched film. These polymers can be used alone or in combination of 2 or more. As the resin film, a polyamideimide film or a polyimide film excellent in transparency and heat resistance, a uniaxially or biaxially stretched polyester film, a cycloolefin derivative film excellent in transparency and heat resistance and capable of coping with the enlargement of the film, a polymethyl methacrylate film, and a triacetyl cellulose and isobutyl cellulose film excellent in transparency and free from optical anisotropy are preferable. The thickness of the resin film is 5 to 200 μm, preferably 20 to 100 μm.
The hard coat layer can be formed by curing a hard coat layer composition comprising a reactive material that forms a cross-linked structure upon irradiation of light or thermal energy. The hard coat layer can be formed by curing a hard coat composition containing both a photocurable (meth) acrylate monomer or oligomer and a photocurable epoxy monomer or oligomer. The photocurable (meth) acrylate monomer may include 1 or more selected from the group consisting of epoxy (meth) acrylate, urethane (meth) acrylate, and polyester (meth) acrylate. The epoxy (meth) acrylate can be obtained by reacting a carboxylic acid having a (meth) acryloyl group with an epoxy compound.
The hard coating composition can further include one or more selected from the group consisting of a solvent, a photoinitiator, and an additive. The additive may include one or more selected from the group consisting of inorganic nanoparticles, a leveling agent, and a stabilizer, and in addition, each component generally used in the art may further include, for example, an antioxidant, a UV absorber, a surfactant, a lubricant, an antifouling agent, and the like.
[ examples ] A method for producing a compound
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In the examples, the parts and percentages characterizing the content or amount used are based on weight unless otherwise specified. The measurement of each physical property in the following examples was performed by the following method.
[ measurement method ]
(1) Method for measuring film thickness
The measurement was carried out using MH-15M, a digital micrometer manufactured by Nikon corporation.
(2) Method for measuring phase difference value
The measurement was performed using a phase difference measuring device KOBRA-WPR (manufactured by Okinson instruments Co., Ltd.). Unless otherwise specified, the phase difference value means a value at a wavelength of 550 nm.
(3) Method for measuring photoelastic coefficient
A phase difference value (23 ℃/550 nm) at the center of the sample was measured by applying a stress (0.5N to 8N) while holding both ends of the sample (1.5 cm. times.6 cm in size) by using a phase difference measuring device KOBRA-WPR (manufactured by Okinson instruments Co., Ltd.), and the value was calculated from the slope of a function of the stress and the phase difference value.
(4) Determination method of storage modulus:
the storage modulus (G') of the pressure-sensitive adhesive layer was measured in accordance with the following (I) to (III).
(I) 25. + -.1 mg of each of 2 samples were taken out from the adhesive layer, and they were molded into a substantially spherical shape.
(II) the 2 samples obtained in the above (I) were attached to the upper and lower surfaces of an I-shaped jig, and the upper and lower surfaces were sandwiched by an L-shaped jig. The structure of the measurement sample was L-clamp/adhesive/I-clamp/adhesive/L-clamp.
(III) the storage modulus (G') of the thus-prepared sample was measured under conditions of a temperature of 23 ℃, a frequency of 1Hz, and an initial strain of 1N using a dynamic viscoelasticity measuring apparatus [ DVA-220, manufactured by ITK measurement control (Ltd.).
(5) The brightness measurement method comprises the following steps:
the measurement was carried out using a spectral radiance meter SR-UL1 manufactured by TOPCON. In addition, the measurement was performed under a 2 ° field of view.
Production example 1 production of polarizing element 1
A polyvinyl alcohol film having a thickness of 75 μm and containing polyvinyl alcohol having an average polymerization degree of about 2400 and a saponification degree of 99.9 mol% or more was uniaxially stretched in a dry state by about 5 times, immersed in pure water at 60 ℃ for 1 minute while maintaining the stretched state, and then immersed in an aqueous solution having a weight ratio of iodine/potassium iodide/water of 0.05/5/100 at 28 ℃ for 60 seconds. Thereafter, the plate was immersed in an aqueous solution having a weight ratio of potassium iodide/boric acid/water of 8.5/8.5/100 at 72 ℃ for 300 seconds. Subsequently, the substrate was washed with pure water at 26 ℃ for 20 seconds and then dried at 65 ℃ to obtain a 28 μm thick polarizer 1 in which iodine was adsorbed and oriented in polyvinyl alcohol.
Production example 2 production of polarizing element 2
A polyvinyl alcohol film having a thickness of 50 μm and containing polyvinyl alcohol having an average polymerization degree of about 2400 and a saponification degree of 99.9 mol% or more was uniaxially dry-stretched by about 5 times, immersed in pure water at 60 ℃ for 1 minute while maintaining the tension, and then immersed in an aqueous solution having a weight ratio of iodine/potassium iodide/water of 0.05/5/100 at 28 ℃ for 60 seconds. Thereafter, the plate was immersed in an aqueous solution having a weight ratio of potassium iodide/boric acid/water of 8.5/8.5/100 at 72 ℃ for 300 seconds. Subsequently, the substrate was washed with pure water at 26 ℃ for 20 seconds and then dried at 65 ℃ to obtain a polarizing element 2 having a thickness of 18 μm in which iodine was adsorbed and oriented on polyvinyl alcohol.
[ preparation of protective film ]
And (3) protecting the film A:
a triacetyl cellulose film having a thickness of 40 μm (trade name "KC 4 UYW" manufactured by KONICA MINOLTA OPTO Co., Ltd.).
And (3) a protective film B:
100 parts by weight of the imidized MS resin pellets (weight-average molecular weight: 105000) described in production example 1 of Japanese patent application laid-open No. 2010-284840 were dried under 100.5kPa at 100 ℃ for 12 hours, and extruded from a T-die at a die temperature of 270 ℃ by a single-shaft extruder to be formed into a film shape (thickness: 160 μm). Further, the film was stretched in the carrying direction at 150 ℃ in an atmosphere (thickness: 80 μm), and then in the direction perpendicular to the carrying direction at 150 ℃ in an atmosphere, to obtain a protective film B ((meth) acrylic resin film) having a thickness of 40 μm. The protective film B had an in-plane retardation Re of 0.5nm at a wavelength of 550nm and a retardation Rth of 0.82nm in the thickness direction. The photoelastic coefficient of the resulting film was 2.0X 10- 12Pa-1。
And (3) a protective film C:
a protective film C ((meth) acrylic resin film) having a thickness of 40 μm was obtained in the same manner as for the protective film B except that the imidized MS resin particles were replaced with the transparent particles of the acrylic copolymer described in comparative example 1 of Japanese patent application laid-open No. 2008-191426). The protective film C had an in-plane retardation Re of 0.8nm at a wavelength of 550nm and a retardation Rth of 1.02nm in the thickness direction. Of the resulting filmPhotoelastic coefficient of 2.1X 10-12Pa-1。
And (3) a protective film D:
a protective film D ((meth) acrylic resin film) having a thickness of 40 μm was obtained in the same manner as for the protective film B except that the imidized MS resin particles were replaced with the transparent particles of the acrylic copolymer described in example 1 of Japanese patent application laid-open No. 2008-191426. The protective film D had an in-plane retardation Re of 0.4nm at a wavelength of 550nm and a retardation Rth of 0.73nm in the thickness direction. The photoelastic coefficient of the resulting film was 1.3X 10-12Pa-1。
And (3) a protective film E:
a norbornene resin film having a thickness of 23 μm [ trade name "ZF 14-023" manufactured by ZEON K.K. ]. The protective film E had an in-plane retardation Re of 0.7nm at a wavelength of 550nm and a retardation Rth of 4.2nm in the thickness direction. Photoelastic coefficient of 1.6X 10-12Pa-1。
And (3) protecting the film F:
a 1/4 wave plate was produced in a roll form in the same manner as in the 1/4 wave plate a1 obliquely stretched as described in production example 3 of international publication No. 2017/094485, except that the stretching direction was changed to the longitudinal direction. The 1/4 wavelength plate (protective film F) had a thickness of 35 μm, a slow axis in the longitudinal direction, and an in-plane retardation Re of 136 nm. The photoelastic coefficient of the obtained film was 4.0X 10-12Pa-1。
And (3) a protective film G:
a 1/4 wave plate was produced in a roll form in the same manner as in the 1/4 wave plate B4 obliquely stretched in production example 5 of international publication No. 2017/094485, except that the stretching direction was changed to the longitudinal direction. The 1/4 wavelength plate (protective film G) had a thickness of 47 μm, a slow axis in the longitudinal direction, and an in-plane retardation Re of 140 nm. The photoelastic coefficient of the obtained film was 6.0X 10-12Pa-1。
And (3) a protective film H:
a triacetyl cellulose film having a thickness of 20 μm (trade name "ZRG 20 SL" manufactured by Fuji film Co., Ltd.). In-plane phase of protective film H at wavelength of 550nmThe retardation Re was 1.1nm, and the retardation Rth in the thickness direction was 1.3 nm. Photoelastic coefficient of 9.4X 10-12Pa-1。
[ preparation of adhesive ]
50g of a modified PVA-based resin having an acetoacetoxy group (Gohsenx Z-410, manufactured by Mitsubishi chemical corporation) was dissolved in 950g of pure water, heated at 90 ℃ for 2 hours, and then cooled to room temperature to obtain a PVA solution A.
Then, the PVA solution a, maleic acid, glyoxal, and pure water were mixed so that the respective compounds have the following concentrations to prepare a PVA-based adhesive.
PVA concentration 3.0% by weight
Maleic acid 0.01% by weight
Glyoxal 0.15% by weight
[ preparation of high retardation film ]
COSMOSHINE SRF (Super Retardation Film) (thickness 80 μm) manufactured by Toyobo Co., Ltd. was used. The in-plane phase difference Re 550 is 8400 nm.
[ preparation of adhesive ]
Adhesive A: commercially available sheet-like acrylic adhesive having a thickness of 15 μm (storage modulus 0.06MPa)
And (3) adhesive B: commercially available sheet-like acrylic adhesive having a thickness of 25 μm (storage modulus 0.06MPa)
[ example 1]
An adhesive a was applied to one surface of the polarizing element 1 obtained in production example 1 and a protective film a (2 nd protective film) was bonded thereto, and an adhesive a was applied to the other surface of the polarizing element and a protective film B (1 st protective film) was bonded thereto. Then, the resultant was dried to obtain a polarizing plate a. In addition, when these materials are bonded, the bonding surfaces of the respective materials are subjected to corona treatment.
The adhesive a was bonded to one surface of the high retardation film. In addition, when these materials are bonded, the bonding surfaces of the respective materials are subjected to corona treatment.
The surface of the protective film a of the polarizing plate thus produced and the adhesive surface of the high retardation film were bonded so that the angle θ formed by the absorption axis of the polarizing element and the slow axis of the high retardation film became 45 °, to produce an optical laminate a. In addition, when these materials are bonded, the bonding surfaces of the respective materials are subjected to corona treatment.
Finally, an adhesive B was bonded to the surface B of the protective film of the obtained optical laminate a. In addition, when these materials are bonded, the bonding surfaces of the respective materials are subjected to corona treatment.
Examples 2 to 8 and comparative example 1
Optical laminates B to I (examples 2 to 8 and comparative example 1) to which a pressure-sensitive adhesive B was bonded were produced in the same manner as in example 1, except that the 1 st protective film and/or polarizing element described in table 1 was used for the optical laminate a produced as example 1.
[ reference example 1]
An optical laminate J with a pressure-sensitive adhesive B was produced in the same manner as in example 1, except that the optical laminate a with a pressure-sensitive adhesive B in example 1 was laminated so that the angle between the absorption axis of the polarizing plate and the slow axis of the high retardation film became 90 °.
[ reference example 2]
The polarizing element obtained in production example 1 was coated with the adhesive a on one surface and bonded with the protective film a, and the other surface was coated with the adhesive a and bonded with the protective film H. Then, the resultant was dried to obtain a polarizing plate K. In addition, when these materials are bonded, the bonding surfaces of the respective materials are subjected to corona treatment.
The adhesive B was bonded to the surface of the protective film H of the obtained optical laminate K, to obtain a back polarizing plate with an adhesive layer. In addition, when these materials are bonded, the bonding surfaces of the respective materials are subjected to corona treatment.
(preparation of sample A for evaluation)
The optical laminate a with the adhesive B was cut into a size of 20mm × 20mm, and bonded to alkali-free glass having a thickness of 0.7mm or 30mm × 30mm with the adhesive B interposed therebetween. Sample a for evaluation was prepared by cutting an optical laminate K (without high retardation film bonding) with an adhesive B into a size of 20mm × 20mm, and bonding the optical laminate K to the side of the alkali-free glass to which the optical laminate a was not bonded via the adhesive B so that the absorption axes of the polarizing plates were orthogonal nicols to each other.
(preparation of samples B to K for evaluation)
Samples B to K for evaluation were produced in the same manner as in the case of sample a for evaluation except that the optical laminate a was replaced with the optical laminates B to K, respectively.
(evaluation of Black Brightness Change)
The side of the evaluation samples A to K prepared above to which the optical laminate K was bonded was placed at 20000cd/m2The white backlight module of luminance (2) was measured for luminance (black luminance 1) from the evaluation sample side (high retardation film), stored in a heating environment at 95 ℃ for 240 hours, cooled to room temperature, and measured for luminance (black luminance 2) again, and the rate of change (%) of black luminance 2 with respect to black luminance 1 was calculated and used as a change in black luminance. Specifically, by: the black luminance change (%) is { | black luminance 2 — black luminance 1 |/black luminance 1} × 100, and the black luminance change is determined. The evaluation results are shown in table 1.
[ TABLE 1]
The following are clear from the results shown in table 1.
1. An optical laminate obtained by laminating a high retardation film at 45 ° has an increased black brightness after a high temperature durability test, but has a photoelastic coefficient of 8.0 × 10-12Pa-1The following protective film 1 can suppress the increase in black luminance after the high-temperature durability test.
2. In addition to the above, by setting the thickness of the polarizer to 20 μm or less (using the polarizer 2), the increase in black luminance after the high temperature durability test can be further suppressed.
Claims (8)
1. An optical laminate, wherein,
comprising a polarizing plate and a high retardation film in this order,
the polarizing plate has a polarizing element and a protective film laminated on a surface of the polarizing element opposite to the high retardation film,
the in-plane retardation value of the high retardation film is 3000 to 30000nm,
an angle formed by the slow axis of the high phase difference film and the absorption axis of the polarizer is 40-50 degrees,
the absolute value of the photoelastic coefficient of the protective film is 8 multiplied by 10-12Pa-1The following.
2. The optical stack of claim 1,
the protective film includes at least one selected from the group consisting of a (meth) acrylic resin, a polystyrene resin, and a maleimide resin.
3. The optical stack of claim 1,
the protective film comprises a cycloolefin resin.
4. The optical stack according to any one of claims 1 to 3,
the in-plane phase difference value of the protective film is 10nm or less.
5. The optical stack according to any one of claims 1 to 3,
the in-plane phase difference value of the protective film is 50 nm-300 nm.
6. The optical stack according to any one of claims 1 to 5,
the thickness of the high retardation film is 200 [ mu ] m or less.
7. The optical stack according to any one of claims 1 to 6,
the high retardation film and the polarizing plate are laminated with an adhesive layer interposed therebetween.
8. A display device, wherein,
an optical laminate according to any one of claims 1 to 7, which is laminated on a display element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019167769A JP7345330B2 (en) | 2019-09-13 | 2019-09-13 | Optical laminate and display device using the same |
| JP2019-167769 | 2019-09-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112505814A true CN112505814A (en) | 2021-03-16 |
| CN112505814B CN112505814B (en) | 2024-09-24 |
Family
ID=74864051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010931983.6A Active CN112505814B (en) | 2019-09-13 | 2020-09-07 | Display device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7345330B2 (en) |
| KR (1) | KR20210031840A (en) |
| CN (1) | CN112505814B (en) |
| TW (1) | TWI849200B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001221915A (en) * | 2000-02-07 | 2001-08-17 | Kanegafuchi Chem Ind Co Ltd | Optical film, polarizer protective film consisting of that film, and polarizing plate |
| CN1448734A (en) * | 2002-04-01 | 2003-10-15 | 日东电工株式会社 | Optical films and display system |
| WO2004057381A1 (en) * | 2002-12-20 | 2004-07-08 | Teijin Limited | Transparent conductive laminate, touch panel and liquid crystal display unit with touch panel |
| JP2008216416A (en) * | 2007-03-01 | 2008-09-18 | Sumitomo Chemical Co Ltd | Retardation film, combined polarizing plate, and liquid crystal display device using the same |
| JP2009015283A (en) * | 2007-05-01 | 2009-01-22 | Nitto Denko Corp | Liquid crystal panel and liquid crystal display device |
| JP2011232627A (en) * | 2010-04-28 | 2011-11-17 | Nitto Denko Corp | Adhesive polarizing plate and image display device |
| JP2014170202A (en) * | 2012-10-12 | 2014-09-18 | Fujifilm Corp | Liquid crystal display device |
| JP2017125949A (en) * | 2016-01-14 | 2017-07-20 | 住友化学株式会社 | High-luminance polarizing plate and liquid crystal display device using the same |
| WO2018061648A1 (en) * | 2016-09-30 | 2018-04-05 | 日本ゼオン株式会社 | Optical film and production method therefor, and polarizing plate |
| JP2019079040A (en) * | 2017-10-19 | 2019-05-23 | 日東電工株式会社 | Head-up display device |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4566385B2 (en) * | 2000-10-30 | 2010-10-20 | 日東電工株式会社 | Polarizer |
| JP2003240957A (en) * | 2002-02-22 | 2003-08-27 | Sumitomo Chem Co Ltd | Polarization converting element and projection type liquid crystal display device |
| JP3880996B2 (en) * | 2004-05-26 | 2007-02-14 | 日東電工株式会社 | Elliptical polarizing plate and liquid crystal display device |
| JP2008268786A (en) * | 2007-04-25 | 2008-11-06 | Nitto Denko Corp | Combination polarizing plate |
| JP5391818B2 (en) * | 2008-06-11 | 2014-01-15 | 住友化学株式会社 | Method for producing retardation film |
| JP2011227337A (en) * | 2010-04-21 | 2011-11-10 | Nitto Denko Corp | Polarizing plate, liquid crystal panel, and liquid crystal display device |
| JP6136093B2 (en) * | 2011-05-31 | 2017-05-31 | 住友化学株式会社 | Composite polarizing plate and liquid crystal display device |
| JP5396439B2 (en) | 2011-07-22 | 2014-01-22 | 学校法人慶應義塾 | Method for improving visibility of liquid crystal display device, and liquid crystal display device using the same |
| KR20130074559A (en) * | 2011-12-26 | 2013-07-04 | 동우 화인켐 주식회사 | Liquid crystal display device without nonuniform display |
| JP5838835B2 (en) * | 2012-02-01 | 2016-01-06 | コニカミノルタ株式会社 | Liquid crystal display |
| JP6071459B2 (en) * | 2012-11-19 | 2017-02-01 | 日東電工株式会社 | Polarizing plate, image display device, and manufacturing method thereof |
| JP5990128B2 (en) * | 2013-05-01 | 2016-09-07 | 富士フイルム株式会社 | Liquid crystal display |
| JP2015160942A (en) * | 2014-02-28 | 2015-09-07 | 帝人株式会社 | thermoplastic resin composition |
| TWI657922B (en) * | 2014-04-03 | 2019-05-01 | 南韓商東友精細化工有限公司 | Polarizing plate and liquid crystal panel |
| JP2015205997A (en) * | 2014-04-21 | 2015-11-19 | Ｊｘ日鉱日石エネルギー株式会社 | acrylic copolymer, optical film, polarizing plate and liquid crystal display device |
| WO2016185722A1 (en) * | 2015-05-21 | 2016-11-24 | 株式会社日本触媒 | Resin composition and film |
| JP6482414B2 (en) * | 2015-07-03 | 2019-03-13 | 富士フイルム株式会社 | Optical film, polarizing plate and liquid crystal display device using the same |
| JP2017102426A (en) * | 2015-11-20 | 2017-06-08 | 住友化学株式会社 | Polarizing plate and liquid crystal panel |
| WO2017130656A1 (en) * | 2016-01-29 | 2017-08-03 | 住友化学株式会社 | Production method for polarizing plates |
| JP2018013774A (en) * | 2016-07-08 | 2018-01-25 | 日東電工株式会社 | Optical member and liquid crystal display |
| JP6850601B2 (en) * | 2016-12-21 | 2021-03-31 | 日東電工株式会社 | Image display device |
| JP2021128235A (en) * | 2020-02-13 | 2021-09-02 | 大日本印刷株式会社 | Optical sheet, liquid crystal display device, and manufacturing method for optical sheet |
-
2019
- 2019-09-13 JP JP2019167769A patent/JP7345330B2/en active Active
-
2020
- 2020-08-18 TW TW109128087A patent/TWI849200B/en active
- 2020-09-07 CN CN202010931983.6A patent/CN112505814B/en active Active
- 2020-09-11 KR KR1020200116569A patent/KR20210031840A/en active Search and Examination
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001221915A (en) * | 2000-02-07 | 2001-08-17 | Kanegafuchi Chem Ind Co Ltd | Optical film, polarizer protective film consisting of that film, and polarizing plate |
| CN1448734A (en) * | 2002-04-01 | 2003-10-15 | 日东电工株式会社 | Optical films and display system |
| WO2004057381A1 (en) * | 2002-12-20 | 2004-07-08 | Teijin Limited | Transparent conductive laminate, touch panel and liquid crystal display unit with touch panel |
| JP2008216416A (en) * | 2007-03-01 | 2008-09-18 | Sumitomo Chemical Co Ltd | Retardation film, combined polarizing plate, and liquid crystal display device using the same |
| JP2009015283A (en) * | 2007-05-01 | 2009-01-22 | Nitto Denko Corp | Liquid crystal panel and liquid crystal display device |
| JP2011232627A (en) * | 2010-04-28 | 2011-11-17 | Nitto Denko Corp | Adhesive polarizing plate and image display device |
| JP2014170202A (en) * | 2012-10-12 | 2014-09-18 | Fujifilm Corp | Liquid crystal display device |
| JP2017125949A (en) * | 2016-01-14 | 2017-07-20 | 住友化学株式会社 | High-luminance polarizing plate and liquid crystal display device using the same |
| WO2018061648A1 (en) * | 2016-09-30 | 2018-04-05 | 日本ゼオン株式会社 | Optical film and production method therefor, and polarizing plate |
| JP2019079040A (en) * | 2017-10-19 | 2019-05-23 | 日東電工株式会社 | Head-up display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7345330B2 (en) | 2023-09-15 |
| KR20210031840A (en) | 2021-03-23 |
| JP2021043421A (en) | 2021-03-18 |
| TWI849200B (en) | 2024-07-21 |
| TW202125059A (en) | 2021-07-01 |
| CN112505814B (en) | 2024-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101553411B1 (en) | A polarizing film a polarizer and a process for manufacturing these | |
| TWI793310B (en) | Polarizing plate and display device | |
| WO2013042795A1 (en) | Stretched film and method for producing same | |
| JP2008003426A (en) | Polarizing plate | |
| JP2009109995A (en) | Polarizing plate and liquid crystal display apparatus using the same | |
| KR20140074221A (en) | Method of producing polarizable laminated film and polarising plate, polarizable laminated film and polarizing plates set | |
| KR20200014222A (en) | Circular polarizer and display device | |
| CN107076912B (en) | Method for producing polarizing laminate film or polarizing plate | |
| JP5410771B2 (en) | Polarizer outer surface protective film, polarizing plate, and liquid crystal display element | |
| US11269212B2 (en) | Polarizer, method of producing polarizer, and optical laminate including the polarizer | |
| JP6075826B2 (en) | Polarizing plate with retardation layer | |
| TWI806968B (en) | Laminated film | |
| CN110221374B (en) | Polarizing plate and method for manufacturing polarizing plate | |
| JP2016177165A (en) | Optical laminate, manufacturing method therefor and image display unit using the optical laminate | |
| CN110579830B (en) | Optical laminate | |
| CN112505814B (en) | Display device | |
| JP5463020B2 (en) | Liquid crystal panel and liquid crystal display device | |
| CN110221375B (en) | Laminated film | |
| TWI692652B (en) | Optical laminate and reflection-type liquid crystal display apparatus | |
| CN115113317A (en) | Optical laminate, method for producing same, and image display device | |
| JP2022145412A (en) | Optical laminate, manufacturing method thereof and picture display unit | |
| WO2022191033A1 (en) | Polarizing plate | |
| JP7217723B2 (en) | Optical layered body, manufacturing method thereof, and image display device using the optical layered body | |
| CN110780373A (en) | Circular polarizing plate and display device | |
| CN113495316A (en) | Polarizing plate and image display device using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |