CN118302700A - Optical film - Google Patents
Optical film Download PDFInfo
- Publication number
- CN118302700A CN118302700A CN202280077792.5A CN202280077792A CN118302700A CN 118302700 A CN118302700 A CN 118302700A CN 202280077792 A CN202280077792 A CN 202280077792A CN 118302700 A CN118302700 A CN 118302700A
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- CN
- China
- Prior art keywords
- optical film
- resin layer
- present
- less
- polarizer
- 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.)
- Pending
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- 239000012788 optical film Substances 0.000 title claims abstract description 166
- 239000011347 resin Substances 0.000 claims abstract description 160
- 229920005989 resin Polymers 0.000 claims abstract description 160
- 239000010408 film Substances 0.000 claims abstract description 94
- 230000035699 permeability Effects 0.000 claims abstract description 83
- 150000001875 compounds Chemical class 0.000 claims abstract description 72
- 239000000758 substrate Substances 0.000 claims abstract description 61
- 239000000203 mixture Substances 0.000 claims abstract description 43
- 238000005452 bending Methods 0.000 claims abstract description 41
- 125000000524 functional group Chemical group 0.000 claims abstract description 30
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 239000000178 monomer Substances 0.000 claims abstract description 12
- 239000010410 layer Substances 0.000 claims description 148
- 230000003287 optical effect Effects 0.000 claims description 28
- -1 cyclic olefin Chemical class 0.000 claims description 19
- 239000012790 adhesive layer Substances 0.000 claims description 18
- 229920000642 polymer Polymers 0.000 claims description 16
- 229920001225 polyester resin Polymers 0.000 claims description 6
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 5
- 229920002678 cellulose Polymers 0.000 claims description 4
- 239000001913 cellulose Substances 0.000 claims description 4
- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000007373 indentation Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 abstract description 37
- 238000002845 discoloration Methods 0.000 description 34
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 32
- 238000000576 coating method Methods 0.000 description 27
- 239000011248 coating agent Substances 0.000 description 26
- 239000000463 material Substances 0.000 description 22
- 239000007787 solid Substances 0.000 description 16
- 125000004122 cyclic group Chemical group 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 239000007788 liquid Substances 0.000 description 13
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 12
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 12
- 125000001931 aliphatic group Chemical group 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 239000002985 plastic film Substances 0.000 description 11
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 description 9
- 229920005601 base polymer Polymers 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 9
- 239000003999 initiator Substances 0.000 description 9
- 125000005647 linker group Chemical group 0.000 description 9
- 229920003023 plastic Polymers 0.000 description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 description 9
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 8
- 229920002284 Cellulose triacetate Polymers 0.000 description 7
- 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 7
- 229920000728 polyester Polymers 0.000 description 7
- 239000004925 Acrylic resin Substances 0.000 description 6
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 6
- 239000004593 Epoxy Substances 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 6
- 239000012948 isocyanate Substances 0.000 description 6
- 150000002513 isocyanates Chemical class 0.000 description 6
- 229920005862 polyol Polymers 0.000 description 6
- 150000003077 polyols Chemical class 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- BGTOWKSIORTVQH-UHFFFAOYSA-N cyclopentanone Chemical compound O=C1CCCC1 BGTOWKSIORTVQH-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 5
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 4
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001723 curing Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 230000001747 exhibiting effect Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- 239000011630 iodine Substances 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 229920006255 plastic film Polymers 0.000 description 4
- 239000005056 polyisocyanate Substances 0.000 description 4
- 229920001228 polyisocyanate Polymers 0.000 description 4
- 229930195734 saturated hydrocarbon Natural products 0.000 description 4
- 125000005504 styryl group Chemical group 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 3
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 150000001334 alicyclic compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical class OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 3
- 125000004356 hydroxy functional group Chemical group O* 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 3
- 229920000058 polyacrylate Polymers 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- 239000003505 polymerization initiator Substances 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 2
- OVBFMUAFNIIQAL-UHFFFAOYSA-N 1,4-diisocyanatobutane Chemical compound O=C=NCCCCN=C=O OVBFMUAFNIIQAL-UHFFFAOYSA-N 0.000 description 2
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 2
- QQZOPKMRPOGIEB-UHFFFAOYSA-N 2-Oxohexane Chemical compound CCCCC(C)=O QQZOPKMRPOGIEB-UHFFFAOYSA-N 0.000 description 2
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 2
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 2
- ZPVFWPFBNIEHGJ-UHFFFAOYSA-N 2-octanone Chemical compound CCCCCCC(C)=O ZPVFWPFBNIEHGJ-UHFFFAOYSA-N 0.000 description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- HCFAJYNVAYBARA-UHFFFAOYSA-N 4-heptanone Chemical compound CCCC(=O)CCC HCFAJYNVAYBARA-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
- 235000010724 Wisteria floribunda Nutrition 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 2
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- ORILYTVJVMAKLC-UHFFFAOYSA-N adamantane Chemical compound C1C(C2)CC3CC1CC2C3 ORILYTVJVMAKLC-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- RDOXTESZEPMUJZ-UHFFFAOYSA-N anisole Chemical compound COC1=CC=CC=C1 RDOXTESZEPMUJZ-UHFFFAOYSA-N 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 2
- 239000012965 benzophenone Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001639 boron compounds Chemical class 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005401 electroluminescence Methods 0.000 description 2
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 2
- IIEWJVIFRVWJOD-UHFFFAOYSA-N ethylcyclohexane Chemical compound CCC1CCCCC1 IIEWJVIFRVWJOD-UHFFFAOYSA-N 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- 150000002923 oximes Chemical class 0.000 description 2
- XNLICIUVMPYHGG-UHFFFAOYSA-N pentan-2-one Chemical compound CCCC(C)=O XNLICIUVMPYHGG-UHFFFAOYSA-N 0.000 description 2
- FDPIMTJIUBPUKL-UHFFFAOYSA-N pentan-3-one Chemical compound CCC(=O)CC FDPIMTJIUBPUKL-UHFFFAOYSA-N 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical class C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 2
- QNODIIQQMGDSEF-UHFFFAOYSA-N (1-hydroxycyclohexyl)-phenylmethanone Chemical compound C=1C=CC=CC=1C(=O)C1(O)CCCCC1 QNODIIQQMGDSEF-UHFFFAOYSA-N 0.000 description 1
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical class O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 description 1
- LZDKZFUFMNSQCJ-UHFFFAOYSA-N 1,2-diethoxyethane Chemical compound CCOCCOCC LZDKZFUFMNSQCJ-UHFFFAOYSA-N 0.000 description 1
- MSAHTMIQULFMRG-UHFFFAOYSA-N 1,2-diphenyl-2-propan-2-yloxyethanone Chemical compound C=1C=CC=CC=1C(OC(C)C)C(=O)C1=CC=CC=C1 MSAHTMIQULFMRG-UHFFFAOYSA-N 0.000 description 1
- BGJSXRVXTHVRSN-UHFFFAOYSA-N 1,3,5-trioxane Chemical compound C1OCOCO1 BGJSXRVXTHVRSN-UHFFFAOYSA-N 0.000 description 1
- BPXVHIRIPLPOPT-UHFFFAOYSA-N 1,3,5-tris(2-hydroxyethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound OCCN1C(=O)N(CCO)C(=O)N(CCO)C1=O BPXVHIRIPLPOPT-UHFFFAOYSA-N 0.000 description 1
- RTTZISZSHSCFRH-UHFFFAOYSA-N 1,3-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC(CN=C=O)=C1 RTTZISZSHSCFRH-UHFFFAOYSA-N 0.000 description 1
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OHLKMGYGBHFODF-UHFFFAOYSA-N 1,4-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=C(CN=C=O)C=C1 OHLKMGYGBHFODF-UHFFFAOYSA-N 0.000 description 1
- SBJCUZQNHOLYMD-UHFFFAOYSA-N 1,5-Naphthalene diisocyanate Chemical compound C1=CC=C2C(N=C=O)=CC=CC2=C1N=C=O SBJCUZQNHOLYMD-UHFFFAOYSA-N 0.000 description 1
- FWWWRCRHNMOYQY-UHFFFAOYSA-N 1,5-diisocyanato-2,4-dimethylbenzene Chemical compound CC1=CC(C)=C(N=C=O)C=C1N=C=O FWWWRCRHNMOYQY-UHFFFAOYSA-N 0.000 description 1
- VNQXSTWCDUXYEZ-UHFFFAOYSA-N 1,7,7-trimethylbicyclo[2.2.1]heptane-2,3-dione Chemical compound C1CC2(C)C(=O)C(=O)C1C2(C)C VNQXSTWCDUXYEZ-UHFFFAOYSA-N 0.000 description 1
- PWMWNFMRSKOCEY-UHFFFAOYSA-N 1-Phenyl-1,2-ethanediol Chemical compound OCC(O)C1=CC=CC=C1 PWMWNFMRSKOCEY-UHFFFAOYSA-N 0.000 description 1
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 description 1
- CTOHEPRICOKHIV-UHFFFAOYSA-N 1-dodecylthioxanthen-9-one Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C=CC=C2CCCCCCCCCCCC CTOHEPRICOKHIV-UHFFFAOYSA-N 0.000 description 1
- YIKSHDNOAYSSPX-UHFFFAOYSA-N 1-propan-2-ylthioxanthen-9-one Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C=CC=C2C(C)C YIKSHDNOAYSSPX-UHFFFAOYSA-N 0.000 description 1
- KWVGIHKZDCUPEU-UHFFFAOYSA-N 2,2-dimethoxy-2-phenylacetophenone Chemical compound C=1C=CC=CC=1C(OC)(OC)C(=O)C1=CC=CC=C1 KWVGIHKZDCUPEU-UHFFFAOYSA-N 0.000 description 1
- BRKORVYTKKLNKX-UHFFFAOYSA-N 2,4-di(propan-2-yl)thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(C(C)C)=CC(C(C)C)=C3SC2=C1 BRKORVYTKKLNKX-UHFFFAOYSA-N 0.000 description 1
- UXCIJKOCUAQMKD-UHFFFAOYSA-N 2,4-dichlorothioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(Cl)=CC(Cl)=C3SC2=C1 UXCIJKOCUAQMKD-UHFFFAOYSA-N 0.000 description 1
- BTJPUDCSZVCXFQ-UHFFFAOYSA-N 2,4-diethylthioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(CC)=CC(CC)=C3SC2=C1 BTJPUDCSZVCXFQ-UHFFFAOYSA-N 0.000 description 1
- LZHUBCULTHIFNO-UHFFFAOYSA-N 2,4-dihydroxy-1,5-bis[4-(2-hydroxyethoxy)phenyl]-2,4-dimethylpentan-3-one Chemical compound C=1C=C(OCCO)C=CC=1CC(C)(O)C(=O)C(O)(C)CC1=CC=C(OCCO)C=C1 LZHUBCULTHIFNO-UHFFFAOYSA-N 0.000 description 1
- LCHAFMWSFCONOO-UHFFFAOYSA-N 2,4-dimethylthioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(C)=CC(C)=C3SC2=C1 LCHAFMWSFCONOO-UHFFFAOYSA-N 0.000 description 1
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 description 1
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
- PTTPXKJBFFKCEK-UHFFFAOYSA-N 2-Methyl-4-heptanone Chemical compound CC(C)CC(=O)CC(C)C PTTPXKJBFFKCEK-UHFFFAOYSA-N 0.000 description 1
- WMYINDVYGQKYMI-UHFFFAOYSA-N 2-[2,2-bis(hydroxymethyl)butoxymethyl]-2-ethylpropane-1,3-diol Chemical compound CCC(CO)(CO)COCC(CC)(CO)CO WMYINDVYGQKYMI-UHFFFAOYSA-N 0.000 description 1
- PTJWCLYPVFJWMP-UHFFFAOYSA-N 2-[[3-hydroxy-2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)COCC(CO)(CO)CO PTJWCLYPVFJWMP-UHFFFAOYSA-N 0.000 description 1
- FGTYTUFKXYPTML-UHFFFAOYSA-N 2-benzoylbenzoic acid Chemical compound OC(=O)C1=CC=CC=C1C(=O)C1=CC=CC=C1 FGTYTUFKXYPTML-UHFFFAOYSA-N 0.000 description 1
- DZZAHLOABNWIFA-UHFFFAOYSA-N 2-butoxy-1,2-diphenylethanone Chemical compound C=1C=CC=CC=1C(OCCCC)C(=O)C1=CC=CC=C1 DZZAHLOABNWIFA-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present invention aims to provide an optical film which has excellent low moisture permeability even when bent and is suitable for a polarizer protective film of a polarizer constituting a flexible display. The optical film (10) has a laminated structure in which a resin layer (1) is laminated on one surface of a light-transmitting substrate (2). The resin layer (1) is formed from a cured product of a curable composition containing at least 1 polymerizable compound selected from the group consisting of a monomer having a polymerizable functional group and an oligomer having a polymerizable functional group. The absolute value (|M 2-M1 |) of the difference between the humidity M 1[g/m2.24h ] of the optical film (10) in the environment of 40 ℃ and 92% relative humidity before the bending test and the humidity M 2[g/m2.24h ] of the optical film (10) in the environment of 92% relative humidity at 40 ℃ is less than 10g/M 2.24h. Bending test: according to JIS K5600-5-1, an optical film (10) was tested using a mandrel having a diameter of 2mm so that the resin layer (1) was positioned outside.
Description
Technical Field
The present invention relates to an optical film. And more particularly to an optical film suitable for a polarizer protective film.
Background
In an image display device (for example, a liquid crystal display device, an organic EL display device, or the like), a polarizing plate is often disposed on at least one side of a display unit due to an image forming method. The polarizing plate plays a role of passing light having a polarization plane in only a predetermined direction, and the performance of the image display device is greatly affected by the difference in performance of the polarizing plate. The polarizer is generally composed of a polarizer formed of a polyvinyl alcohol film or the like in which iodine and a dye are adsorbed and oriented, and a transparent protective film (polarizer protective film) bonded to at least one surface of the polarizer (for example, patent document 1).
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2000-338329
Disclosure of Invention
Problems to be solved by the invention
In recent years, there has been an increasing demand for flexible displays that can be bent in mobile applications such as smart phones and tablet terminals. However, if the surface of the polarizer protective film is damaged such as cracks when the polarizer constituting the flexible display is bent, the permeability to moisture (moisture permeability) may be increased, and the polarizing performance of the polarizer may be lost in a humidified environment, thereby causing a so-called "discoloration" phenomenon.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical film which has low moisture permeability even when bent and is suitable for a polarizer protective film constituting a polarizer of a flexible display.
In addition, if the polarizer protective film is damaged in the manufacturing process, there is a problem that the performance of the polarizer is lowered such as a decrease in low moisture permeability. Therefore, the optical film used for the polarizer protective film is also required to have excellent surface hardness and scratch resistance.
Means for solving the problems
That is, in the 1 st aspect of the present invention, there is provided an optical film comprising a resin layer laminated on one surface of a light-transmitting substrate. The aforementioned resin layer imparts excellent low moisture permeability to the optical film of aspect 1 of the present invention. The resin layer imparts excellent surface hardness and scratch resistance to the optical film according to aspect 1 of the present invention. The resin layer imparts excellent bending resistance to the optical film according to aspect 1 of the present invention. Therefore, the optical film of the 1 st aspect of the present invention having the aforementioned resin layer in the laminated structure is suitable for a polarizer protective film constituting a polarizer of a flexible display.
In the optical film according to the 1 st aspect of the present invention, the resin layer is formed of a cured product of a curable composition containing at least 1 polymerizable compound selected from the group consisting of a monomer having a polymerizable functional group and an oligomer having a polymerizable functional group. This configuration is preferable for imparting excellent low moisture permeability to the optical film of the invention of the 1 st aspect. In addition, it is also preferable to impart excellent surface hardness and scratch resistance to the optical film of the invention of the 1 st aspect. Further, it is also preferable to impart excellent bending resistance to the optical film of the invention according to the 1 st aspect.
In the optical film according to the 1 st aspect of the present invention, the absolute value (|m 2-M1 |) of the difference between the moisture permeability M 1[g/m2 ·24h of the optical film under the condition of 40 ℃ and 92% relative humidity before the bending test and the moisture permeability M 2[g/m2 ·24h of the optical film under the condition of 92% relative humidity after the bending test is less than 10g/M 2 ·24h.
Bending test:
the optical film was tested according to JIS K5600-5-1 using a mandrel having a diameter of 2mm so that the resin layer was positioned outside.
The above-mentioned scheme in which the absolute value of the difference between the moisture permeabilities (|m 2-M1 |) is less than 10g/M 2 ·24h is preferable from the standpoint of: when the optical film according to the 1 st aspect of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display, the optical film exhibits excellent low moisture permeability even when it is folded, and can suppress occurrence of "discoloration" of the polarizer in a humidified environment.
In the optical film according to the 1 st aspect of the present invention, the resin layer preferably has a film thickness of 1 to 10. Mu.m. The thickness of the resin layer of 10 μm or less is preferable from the viewpoint of: when the optical film according to the 1 st aspect of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display, the optical film exhibits excellent low moisture permeability even when it is folded, and can suppress occurrence of "discoloration" of the polarizer in a humidified environment. The thickness of the resin layer is preferably 1 μm or more in order to achieve low moisture permeability, surface hardness, and scratch resistance at a high level.
In the optical film according to the 1 st aspect of the present invention, the thickness of the light-transmitting substrate is preferably 10 to 50 μm. The transparent substrate having a film thickness of 50 μm or less is preferable from the viewpoint of: when the optical film according to the 1 st aspect of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display, the optical film exhibits excellent low moisture permeability even when it is folded, and can suppress occurrence of "discoloration" of the polarizer in a humidified environment. The transparent substrate having a film thickness of 10 μm or more is preferable in terms of achieving low moisture permeability, surface hardness, and scratch resistance at a high level.
In the optical film according to claim 1 of the present invention, it is preferable that the product (hχt) of the nanoindentation hardness H (GPa) of the resin layer and the thickness T (μm) of the optical film is 40 or less. The foregoing scheme in which the product (hχt) is 40 or less is preferable in the following respects: the optical film of the 1 st aspect of the present invention exhibits excellent surface hardness, scratch resistance, and exhibits excellent low moisture permeability even when bent, when the optical film of the 1 st aspect of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display, and can suppress occurrence of "discoloration" of a polarizer in a humidified environment.
In the optical film according to claim 1 of the present invention, it is preferable that the product (er×t) of the elastic modulus Er (GPa) by nanoindentation of the resin layer and the thickness T (μm) of the optical film is 600 or less. The foregoing product (er×t) of 600 or less is preferable from the standpoint of: the optical film of the 1 st aspect of the present invention exhibits excellent surface hardness, scratch resistance, and exhibits excellent low moisture permeability even when bent, when the optical film of the 1 st aspect of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display, and can suppress occurrence of "discoloration" of a polarizer in a humidified environment.
In the optical film according to the 1 st aspect of the present invention, the light-transmitting substrate preferably contains at least 1 selected from the group consisting of cellulose-based resins, polyester-based resins, acrylic-based resins, and cyclic olefin-based polymers. These resins can be suitably used as a base material for a polarizer protective film.
Further, the invention according to claim 2 provides a polarizing plate comprising a polarizer disposed on the side of the optical film according to claim 1 opposite to the resin layer.
Further, the invention according to claim 3 provides an image display device having the polarizing plate according to claim 2. Preferably, in the image display device according to the 3 rd aspect of the present invention, the adhesive layer and the optical member are laminated in this order on the resin layer. Preferably, the image display device of the 3 rd aspect of the present invention is a flexible display.
The polarizing plate according to claim 2 of the present invention, in which the optical film according to claim 1 of the present invention is used as a polarizing plate protective film, exhibits excellent low moisture permeability, surface hardness, scratch resistance, and exhibits excellent low moisture permeability even when folded when used as a polarizing plate constituting a flexible display, and can suppress occurrence of "discoloration" of a polarizer in a humidified environment. Therefore, the image display device according to claim 3, which includes the polarizing plate according to claim 2, is suitable as a flexible display excellent in durability, in which discoloration or the like of the polarizing plate is less likely to occur in a humidified environment even when the polarizing plate is bent.
Effects of the invention
The polarizing plate obtained by using the optical film of the present invention for a polarizing plate protective film exhibits excellent low moisture permeability, surface hardness, scratch resistance, and also exhibits excellent low moisture permeability even in the case of being folded, and can suppress occurrence of "discoloration" of the polarizer in a humidified environment. Therefore, the optical film of the present invention can be suitably used as a polarizer protective film for a polarizer constituting a flexible display.
Drawings
Fig. 1 is a schematic view (cross-sectional view) showing one embodiment of the optical film of the present invention.
FIG. 2 is a schematic diagram (cross-sectional view) illustrating one embodiment of a polarizer having the optical film of FIG. 1.
Fig. 3 is a schematic view (cross-sectional view) showing an embodiment of an image display device having the polarizing plate of fig. 2.
Detailed Description
In the invention according to claim 1, there is provided an optical film comprising a resin layer laminated on one surface of a light-transmitting substrate.
In the present specification, the optical film according to the 1 st aspect of the present invention is sometimes referred to as "the optical film of the present invention". In the present specification, the light-transmitting base material and the resin layer constituting the optical film of the present invention are sometimes referred to as "light-transmitting base material of the present invention" and "resin layer of the present invention", respectively. Further, "film" is meant to include "sheet" and "tape". That is, the optical film of the present invention may have a sheet-like or tape-like form.
In the invention according to claim 2, a polarizer is disposed on the opposite side of the optical film of the invention from the resin layer. In this specification, the polarizing plate according to the 2 nd aspect of the present invention may be referred to as "the polarizing plate according to the present invention".
Further, the 3 rd aspect of the present invention provides an image display device having the polarizing plate of the present invention. In this specification, the image display device according to the 3 rd aspect of the present invention is sometimes referred to as "the image display device according to the present invention".
Embodiments of the optical film according to the present invention will be described below with reference to the drawings, but the present invention is not limited thereto and is merely illustrative.
Fig. 1 is a schematic view (cross-sectional view) showing one embodiment of the optical film of the present invention.
In fig. 1, an optical film 10 has a laminated structure in which a resin layer 1 is laminated on one surface of a light-transmitting substrate 2.
Fig. 2 is a schematic view (cross-sectional view) showing one embodiment of the polarizing plate of the present invention.
In fig. 2, the polarizing plate 20 has a laminated structure in which the polarizer 3 is disposed on the opposite side of the optical film 10 from the resin layer 1. In the present embodiment, the 2 nd light-transmitting substrate 4 and the pressure-sensitive adhesive layer 5 are further laminated in this order on the side of the polarizer 3 opposite to the optical film 10.
Fig. 3 is a schematic view (cross-sectional view) showing an embodiment of an image display device having the polarizing plate of fig. 2.
The image display device 30 of fig. 3 is a structure in which an image display panel 6 is laminated on an adhesive layer 5 of a polarizing plate 20. The image display panel 6 may be a flexible display panel. In the present embodiment, the pressure-sensitive adhesive layer 7 and the optical member 8 are laminated in this order on the resin layer 1. The image display device 30 may be a flexible display. In the case where the image display device 30 is a flexible display, the entire laminated structure may be folded.
Hereinafter, each configuration will be described.
< Optical film >
The term "optical" in the optical film of the present invention means for optical use, more specifically, production of a product (optical product) using an optical member, and the like. Examples of the optical product include an image display device, an input device such as a touch panel, and the like, and the optical product can be suitably used for manufacturing a liquid crystal image display device, a self-luminous image display device (for example, an organic EL (electroluminescence) image display device, and an LED image display device), and the like, and particularly, the optical product can be suitably used for manufacturing a flexible display. More specifically, the film can be suitably used as a protective film for a polarizing plate constituting a flexible display.
The optical film of the present invention is not particularly limited in its form as long as a resin layer is laminated on one surface of a light-transmitting substrate. For example, the optical film of the present invention may have a resin layer on only one side, or may have a resin layer on both sides. In the case where the optical film of the present invention has resin layers on both surfaces, the optical film of the present invention may have a configuration in which both resin layers are provided by the resin layer of the present invention, or may have a configuration in which one resin layer is provided by the resin layer of the present invention and the other resin layer is provided by a resin layer other than the resin layer of the present invention (other resin layer). When the optical film of the present invention is used as a polarizer protective film, an optical film having a resin layer on only one side is preferable.
The optical film of the present invention may have other layers on the surface or between any layers within a range not impairing the effects of the present invention, for example, a substrate other than the light-transmitting substrate of the present invention, a resin layer other than the resin layer of the present invention, an intermediate layer, an undercoat layer, an antistatic layer, a release liner, a surface protective film, and the like, in addition to the light-transmitting substrate of the present invention and the resin layer of the present invention.
In the optical film of the present invention, the absolute value (|m 2-M1 |) of the difference between the moisture permeability M 1[g/m2.24h of the optical film in the environment of 40 ℃ and 92% relative humidity before the bending test and the moisture permeability M 2[g/m2.24h of the optical film in the environment of 92% relative humidity after the bending test at 40 ℃ is less than 10g/M 2.24h.
Bending test:
the optical film was tested according to JIS K5600-5-1 using a mandrel having a diameter of 2mm so that the resin layer was positioned outside.
The optical film of the present invention exhibits excellent low moisture permeability, surface hardness and scratch resistance, and when used as a polarizer protective film for a polarizer constituting a flexible display, if the polarizer protective film is bent to cause damage such as cracks on the surface, the low moisture permeability may be reduced, and "discoloration" of the polarizer may occur in a humidified environment.
In the optical film of the present invention, the above-mentioned scheme in which the absolute value of the difference in moisture permeability (|m 2-M1 |) is less than 10g/M 2 ·24h is preferable from the viewpoint of: when the optical film of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display, the polarizer protective film is less likely to be damaged such as cracks on the surface even when it is bent, exhibits excellent low moisture permeability, and can suppress occurrence of "discoloration" of the polarizer in a humidified environment. The absolute value of the difference in the moisture permeability (|m 2-M1 |) is preferably 9g/M 2 ·24h or less, more preferably 8g/M 2 ·24h or less, still more preferably 7g/M 2 ·24h or less, and may be 6g/M 2 ·24h or 5g/M 2 ·24h or less, from the viewpoint that the occurrence of "discoloration" of the polarizer in a humidified environment can be suppressed even when the polarizer is bent. The lower limit of the absolute value of the difference in moisture permeability (|m 2-M1 |) is not particularly limited, but may be 0.1g/M 2 ·24h or more as the lower limit is more preferable.
The optical film of the present invention preferably has a moisture permeability M 1[g/m2.24h ] of 700g/M 2.24h or less in an environment where the temperature before the bending test is 40 ℃ and the relative humidity is 92%. The above-mentioned scheme in which the moisture permeability M 1 is 700g/M 2.24 hours or less is preferable in the following aspects: when the optical film of the present invention is used as a polarizer protective film, occurrence of "discoloration" of the polarizer can be suppressed in a humidified environment. The moisture permeability M 1 is preferably 600g/M 2.multidot.24 hours or less, and may be 550g/M 2.multidot.24 hours or less, from the viewpoint of suppressing discoloration of the polarizer at a higher level. The lower limit of the moisture permeability M 1 is not particularly limited, but is preferably 100g/M 2 ·24h or more, more preferably 200g/M 2 ·24h or more, and may be 300g/M 2 ·24h or more, in view of preventing the polarizer from "discoloration" by allowing moisture in the polarizer to escape to the outside.
The absolute value of the difference between the moisture permeabilities M 1、M2 and M 1、M2 (|m 2-M1 |) in the optical film of the present invention can be measured by the method of the examples described later. The absolute value of the difference between the moisture permeability M 1、M2 and M 1、M2 (|m 2-M1 |) and the like in the optical film of the present invention can be adjusted by the type and thickness of the resin constituting the light-transmitting substrate of the present invention, the type, composition, crosslinking degree, thickness and the like of the resin constituting the resin layer of the present invention.
In the optical film of the present invention, the product (H×T) of the hardness H [ GPa ] of the resin layer by nanoindentation and the thickness T [ mu ] m of the optical film is preferably 40 or less. When the hardness H of the resin layer by nanoindentation is high, the surface hardness and scratch resistance of the resin layer are excellent, but when the hardness H is too high, damage such as cracking is likely to occur when the resin layer is bent. By controlling the product of the hardness H and the thickness T while adjusting the hardness H to a range where the surface hardness and scratch resistance of the resin layer are excellent, excellent surface hardness and scratch resistance are exhibited, and even when bent, damage such as cracks is not easily generated on the surface, excellent low moisture permeability is exhibited, and occurrence of "discoloration" of the polarizer can be suppressed in a humidified environment.
That is, a scheme in which the aforementioned product (hχt) is 40 or less is preferable in the following aspects: the optical film of the present invention exhibits excellent surface hardness, scratch resistance, and exhibits excellent low moisture permeability even when bent, and can suppress occurrence of "discoloration" of a polarizer in a humidified environment when the optical film of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display. The product (hxt) is preferably 35 or less, more preferably 30 or less, even more preferably 25 or less, and may be 20 or less, from the viewpoint of exhibiting excellent surface hardness, scratch resistance, and excellent low moisture permeability even when bent, and being capable of suppressing occurrence of "discoloration" of the polarizer in a humidified environment. The lower limit of the product (hxt) is not particularly limited, and may be 1 or more from the viewpoint of securing excellent surface hardness, scratch resistance, and low moisture permeability.
In the optical film of the present invention, the product (H×T 1) of the hardness H [ GPa ] of the resin layer by nanoindentation and the thickness T 1 [ mu ] m of the resin layer is preferably 9 or less. By controlling the product of the hardness H and the thickness T 1 while adjusting the hardness H to a range where the surface hardness and scratch resistance of the resin layer are excellent, excellent surface hardness and scratch resistance are exhibited, and even if it is bent, damage such as cracks is not easily generated on the surface, excellent low moisture permeability is exhibited, and occurrence of "discoloration" of the polarizer can be suppressed in a humidified environment. That is, a scheme in which the aforementioned product (h×t 1) is 9 or less is preferable in the following aspects: the optical film of the present invention exhibits excellent surface hardness, scratch resistance, and exhibits excellent low moisture permeability even when bent, and can suppress occurrence of "discoloration" of a polarizer in a humidified environment when the optical film of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display. The product (h×t 1) is preferably 8 or less, more preferably 7 or less, even more preferably 6 or less, and may be 5 or less, from the viewpoint of exhibiting excellent surface hardness, scratch resistance, and excellent low moisture permeability even when bent, and being capable of suppressing occurrence of "discoloration" of the polarizer in a humidified environment. The lower limit of the product (h×t 1) is not particularly limited, and may be 0.5 or more from the viewpoint of securing excellent surface hardness, scratch resistance, and low moisture permeability.
In the optical film of the present invention, the hardness H [ GPa ] of the resin layer by nanoindentation is preferably 0.1GPa or more, more preferably 0.2GPa or more, still more preferably 0.3GPa or more, and particularly preferably 0.4GPa or more, from the viewpoint of excellent surface hardness and scratch resistance. On the other hand, the hardness H [ GPa ] is preferably 1GPa or less, more preferably 0.9GPa or less, further preferably 0.8GPa or less, particularly preferably 0.7GPa or less, from the viewpoint that damage such as cracks is less likely to occur on the surface even when the sheet is bent.
In the optical film of the present invention, the product (ErxT) of the elastic modulus Er [ GPa ] of the resin layer by nanoindentation and the thickness T [ mu ] m of the optical film is preferably 600 or less. When the elastic modulus Er of the resin layer by the nanoindentation method is high, the surface hardness and scratch resistance of the resin layer are excellent, but when the elastic modulus Er is too high, damage such as cracking is likely to occur when the resin layer is bent. The product of the elastic modulus Er and the thickness T is controlled while adjusting the elastic modulus Er to a range where the surface hardness and scratch resistance of the resin layer are excellent, whereby excellent surface hardness and scratch resistance are exhibited, and even when the polarizer is bent, damage such as cracks is not easily generated on the surface, and excellent low moisture permeability is exhibited, and occurrence of "discoloration" of the polarizer can be suppressed in a humidified environment.
That is, a scheme in which the aforementioned product (er×t) is 600 or less is preferable in the following aspects: the optical film of the present invention exhibits excellent surface hardness, scratch resistance, and exhibits excellent low moisture permeability even when bent, and can suppress occurrence of "discoloration" of a polarizer in a humidified environment when the optical film of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display. The product (er×t) is preferably 550 or less, more preferably 500 or less, even more preferably 450 or less, and may be 400 or less, from the viewpoint of exhibiting excellent surface hardness, scratch resistance, and excellent low moisture permeability even when bent, and being capable of suppressing occurrence of "discoloration" of the polarizer in a humidified environment. The lower limit of the product (er×t) is not particularly limited, and may be 10 or more from the viewpoint of securing excellent surface hardness, scratch resistance, and low moisture permeability.
In the optical film of the present invention, the product (er×t 1) of the elastic modulus Er [ GPa ] of the resin layer by nanoindentation and the thickness T 1 [ μm ] of the resin layer is preferably 130 or less. The product of the elastic modulus Er and the thickness T 1 is controlled while adjusting the elastic modulus Er to a range where the surface hardness and scratch resistance of the resin layer are excellent, whereby excellent surface hardness and scratch resistance are exhibited, and even when the polarizer is bent, damage such as cracks is not easily generated on the surface, excellent low moisture permeability is exhibited, and occurrence of "discoloration" of the polarizer can be suppressed in a humidified environment. That is, a solution in which the aforementioned product (elastic modulus er×t 1) is 130 or less is preferable in the following aspects: the optical film of the present invention exhibits excellent surface hardness, scratch resistance, and exhibits excellent low moisture permeability even when bent, and can suppress occurrence of "discoloration" of a polarizer in a humidified environment when the optical film of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display. The product (er×t 1) is preferably 110 or less, more preferably 100 or less, even more preferably 80 or less, and may be 60 or less, from the viewpoint of exhibiting excellent surface hardness, scratch resistance, and excellent low moisture permeability even when bent, and being capable of suppressing occurrence of "discoloration" of the polarizer in a humidified environment. The lower limit of the product (er×t 1) is not particularly limited, and may be 5 or more from the viewpoint of securing excellent surface hardness, scratch resistance, and low moisture permeability.
In the optical film of the present invention, the elastic modulus Er [ GPa ] of the resin layer by nanoindentation is preferably 1GPa or more, more preferably 2GPa or more, still more preferably 3GPa or more, and particularly preferably 4GPa or more, from the viewpoint of excellent surface hardness and scratch resistance. On the other hand, the elastic modulus Er [ GPa ] is preferably 10GPa or less, more preferably 9GPa or less, further preferably 8GPa or less, particularly preferably 7GPa or less, from the viewpoint that damage such as cracks is less likely to occur on the surface even when the sheet is bent.
The hardness H, the elastic modulus Er, and the product of the hardness H, the elastic modulus Er, and the thickness T, T 1 of the optical film according to the present invention by the nanoindentation method can be measured by the method of examples described later. The hardness H, the elastic modulus Er, and the product of these and the thickness T, T 1 of the optical film according to the nanoindentation method can be adjusted by adjusting the type and thickness of the resin constituting the light-transmitting substrate according to the present invention, the type, composition, crosslinking degree, thickness, and the like of the resin constituting the resin layer according to the present invention.
The haze of the optical film of the present invention is not particularly limited, but is preferably 1.0% or less, more preferably 0.8% or less, from the viewpoint of obtaining good transparency. The haze can be determined according to JIS K7136 (2000). The haze of the optical film of the present invention can be adjusted by the type and thickness of the resin constituting the light-transmitting substrate of the present invention, the type and thickness of the resin constituting the resin layer of the present invention, and the like.
The total light transmittance of the optical film of the present invention in the visible light wavelength region is not particularly limited, but is preferably 85% or more, and more preferably 88% or more. The visible light wavelength region can be obtained according to JIS K7361-1. The total light transmittance of the optical film of the present invention can be adjusted by the kind and thickness of the resin constituting the light-transmitting substrate of the present invention, the kind and thickness of the resin constituting the resin layer of the present invention, and the like.
The thickness of the optical film of the present invention is not particularly limited, but is preferably in the range of 11 to 100. Mu.m, more preferably in the range of 20 to 80. Mu.m, most preferably in the range of 20 to 60. Mu.m, in view of workability such as laminability, strength, handleability, etc.
< Light-transmitting substrate >
Examples of the material constituting the light-transmitting substrate of the present invention include glass, plastic film, and the like. Examples of the plastic film include: cellulose resins such as triacetyl cellulose (TAC), acrylic resins such as polymethyl methacrylate (PMMA), polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), cyclic Olefin Polymers (COP) (for example, trade names "ARTON" (manufactured by JSR CORPORATION), trade names "ZEONOR" (manufactured by ZEONOR CORPORATION)), polycarbonate resins, polysulfone resins, polyarylate resins, polyimide resins, polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, ethylene-propylene copolymers, and other plastic materials are preferable from the viewpoints of optical uniformity, surface smoothness, good secondary processability in producing a polarizing plate, and the like. It should be noted that these plastic materials may be used alone or in combination of 2 or more.
The haze of the light-transmitting substrate of the present invention is not particularly limited, but is preferably 1.0% or less, more preferably 0.8% or less, from the viewpoint of obtaining good transparency. The haze can be determined according to JIS K7136 (2000). The haze of the light-transmitting substrate of the present invention can be adjusted by the kind, thickness, etc. of the resin constituting the light-transmitting substrate of the present invention.
The total light transmittance of the light-transmitting substrate of the present invention in the visible light wavelength region is not particularly limited, and is preferably 85% or more, more preferably 88% or more. The visible light wavelength region can be obtained according to JIS K7361-1. The total light transmittance of the light-transmitting substrate of the present invention can be adjusted by the kind, thickness, etc. of the resin constituting the light-transmitting substrate of the present invention.
The film thickness of the light-transmitting substrate of the present invention is preferably 10 to 50. Mu.m. The transparent substrate having a film thickness of 50 μm or less is preferable from the viewpoint of: when the optical film of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display, the film exhibits excellent low moisture permeability even when it is folded, and can suppress occurrence of "discoloration" of the polarizer in a humidified environment; more preferably 48 μm or less, still more preferably 46 μm or less, particularly preferably 44 μm or less, and may be 42 μm or less. The thickness of the light-transmitting substrate is preferably 10 μm or more, more preferably 15 μm or more, still more preferably 20 μm or more, and particularly preferably 25 μm or more, from the viewpoint of achieving low moisture permeability, surface hardness, and scratch resistance at a high level.
The refractive index of the light-transmitting substrate of the present invention is not particularly limited, and is, for example, in the range of 1.30 to 1.80, preferably in the range of 1.40 to 1.70. The surface (resin layer and/or the surface opposite thereto) of the light-transmitting substrate of the present invention may be subjected to a known and conventional surface treatment such as a physical treatment such as corona discharge treatment or plasma treatment, or a chemical treatment such as primer treatment.
< Resin layer >
The resin layer of the present invention is laminated on one surface of the light-transmitting substrate of the present invention to impart excellent low moisture permeability to the optical film of the present invention. The resin layer of the present invention is used to impart excellent surface hardness and scratch resistance to the optical film of the present invention. The resin layer of the present invention is used to impart excellent bending resistance to the optical film of the present invention. Therefore, the optical film of the present invention having the resin layer of the present invention in a laminated structure can be suitably used as a polarizer protective film for a polarizer constituting a flexible display. In the present specification, "bending resistance" means a property that, for example, when the optical film of the present invention is bent, the surface (particularly, the surface of the resin layer) is less likely to be damaged such as cracks.
The resin layer of the present invention preferably does not cause damage when subjected to scratch resistance test under conditions of 10 round trips at a moving speed of 100 mm/sec under a load of 0.98N using steel wool on the surface thereof. That is, the optical film of the present invention is coated with the resin layer of the present invention having excellent surface hardness and scratch resistance, and therefore is less likely to be damaged in the production process, and when used as a polarizer protective film, a polarizer having excellent durability can be provided. The excellent surface hardness and scratch resistance of the resin layer of the present invention can be imparted by adjusting the composition, thickness, etc., of the constituent resin layer described later.
The resin layer of the present invention is formed from a cured product of a curable composition containing at least 1 polymerizable compound selected from the group consisting of a monomer having a polymerizable functional group and an oligomer having a polymerizable functional group. In the present specification, the polymerizable compound constituting the resin layer of the present invention is sometimes referred to as "the polymerizable compound of the present invention", and the curable composition containing the polymerizable compound of the present invention is sometimes referred to as "the curable composition of the present invention". The resin layer of the present invention is preferably formed from a cured product of the curable composition of the present invention containing the polymerizable compound of the present invention, in the following aspects: the optical film of the present invention can be endowed with excellent low moisture permeability, surface hardness, scratch resistance, and bending resistance.
The "polymerizable functional group" of the polymerizable compound of the present invention is not particularly limited, and examples thereof include an unsaturated double bond group, an epoxy group, an oxetane group, and the like, and an unsaturated double bond group is preferable from the viewpoints of excellent low moisture permeability, surface hardness, scratch resistance, and bending resistance. The unsaturated double bond group may be a (meth) acryloyl group, vinyl group, styryl group, allyl group, or the like, and among them, (meth) acryloyl group is preferable. In the present specification, "(meth) acryl" means either or both of "acryl" and "methacryl", and "(meth) acrylic" means either or both of "acrylic" and "methacrylic".
The number of "polymerizable functional groups" of the polymerizable compound of the present invention is not particularly limited as long as it is 1 or more, and the curable composition of the present invention preferably contains at least a polymerizable compound having preferably 2 or more, more preferably 3 or more, still more preferably 4 or more, or 5 or more, 6 or more, 7 or more, 8 or more, 9 or more, or 10 or more polymerizable functional groups in order to impart excellent low moisture permeability, surface hardness, scratch resistance, and bending resistance to the optical film of the present invention. The upper limit of the number of "polymerizable functional groups" is not particularly limited, and may be 30 or less, 25 or less, or 20 or less.
In order to impart excellent low moisture permeability to the optical film of the present invention, the curable composition of the present invention preferably contains a compound having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in the molecule (hereinafter, sometimes referred to as "polymerizable compound a") as the polymerizable compound of the present invention. It is considered that the cyclic aliphatic hydrocarbon group contained in the molecule of the polymerizable compound a hydrophobizes the resin layer of the present invention, and reduces the moisture permeability. The curable composition of the present invention may contain 1 kind of polymerizable compound a, or may contain 2 or more kinds of polymerizable compounds a. The curable composition of the present invention may not contain the polymerizable compound a.
The polymerizable functional group of the polymerizable compound a is preferably an unsaturated double bond group such as a (meth) acryloyl group, a vinyl group, a styryl group, or an allyl group, and among them, (meth) acryloyl groups are preferable. Particularly preferred examples thereof include the following compounds having 2 or more (meth) acryloyl groups in 1 molecule.
The number of "polymerizable functional groups" of the polymerizable compound a in the molecule is not particularly limited as long as it is 1 or more, and it is preferable to have 2 or more, more preferably 3 or more, still more preferably 4 or more polymerizable functional groups in order to impart excellent low moisture permeability, surface hardness, scratch resistance, and bending resistance to the optical film of the present invention. The upper limit of the number of "polymerizable functional groups" of the polymerizable compound a is not particularly limited, and may be 10 or less, 9 or less, or 8 or less.
The "cyclic aliphatic hydrocarbon group" of the polymerizable compound a in the molecule is preferably a group derived from an alicyclic compound having 7 or more carbon atoms, more preferably a group derived from an alicyclic compound having 10 or more carbon atoms, and still more preferably a group derived from an alicyclic compound having 12 or more carbon atoms. The cyclic aliphatic hydrocarbon group is particularly preferably a group derived from a polycyclic compound such as a bicyclic compound or a tricyclic compound.
The cyclic aliphatic hydrocarbon group (including a linking group) is preferably a group represented by any one of the following general formulae (I) to (V), more preferably a group represented by the following general formulae (I), (II) or (IV), and still more preferably a group represented by the following general formula (I).
In the general formula (I), L and L' each independently represent a linking group having a valence of two or more. n represents an integer of 1 to 3.
In the general formula (II), L and L' each independently represent a linking group having a valence of two or more. n represents an integer of 1 to 2.
In the general formula (III), L and L' each independently represent a linking group having a valence of two or more. n represents an integer of 1 to 2.
In the general formula (IV), L and L 'each independently represent a divalent or more linking group, and L' represents a hydrogen atom or a divalent or more linking group.
In the general formula (V), L and L' each independently represent a linking group having a valence of two or more.
Specific examples of the cyclic aliphatic hydrocarbon group include 1 to 3 valent groups derived from norbornane, tricyclodecane, tetracyclododecane, pentacyclopentadecane, adamantane, bis-adamantane and the like.
The polymerizable compound a containing a group represented by any one of the above general formulae (I) to (V) as a cyclic aliphatic hydrocarbon group has a polymerizable functional group via a linking group represented by L, L' and l″. Examples of the linking group include: single bond, optionally substituted alkylene of 1 to 6 carbon atoms, amide group optionally substituted at the N-position, carbamoyl optionally substituted at the N-position, ester group, oxycarbonyl group, ether group and the like, and a group obtained by combining them.
The polymerizable compound a can be easily synthesized by, for example, a first-order or second-order reaction of a polyhydric alcohol such as a diol or a triol having the above-mentioned cyclic aliphatic hydrocarbon group with a carboxylic acid, a carboxylic acid derivative, an epoxy derivative, an isocyanate derivative or the like having a compound such as a (meth) acryloyl group, a vinyl group, a styryl group, an allyl group or the like. Preferably, the catalyst can be synthesized by reacting a polyol having the above-mentioned cyclic aliphatic hydrocarbon group with (meth) acrylic acid, (meth) acryloyl chloride, (meth) acrylic anhydride, glycidyl (meth) acrylate, 1-bis (acryloyloxymethyl) ethyl isocyanate, or the like.
Hereinafter, specific preferable examples of the polymerizable compound a are shown, but the present invention is not limited to these examples.
The content of the polymerizable compound a in the curable composition of the present invention is not particularly limited, but is preferably 10% by weight or more, more preferably 15% by weight or more, or may be 20% by weight or more, 25% by weight or more, 30% by weight or more, 35% by weight or more, 40% by weight or more, 45% by weight or more, 50% by weight or more, 55% by weight or more, 60% by weight or more, 65% by weight or more, 70% by weight or more, 75% by weight or more, 80% by weight or more, 85% by weight or more, or 90% by weight or more, relative to 100% by weight of the nonvolatile solid content of the curable composition of the present invention, from the viewpoint of imparting excellent low moisture permeability to the resin layer of the present invention. On the other hand, the resin layer of the present invention may be 95 wt% or less, 90 wt% or less, 85 wt% or less, 80 wt% or less, 75 wt% or less, 70 wt% or less, 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, 45 wt% or less, 40 wt% or less, 35 wt% or less, 30 wt% or less, 25 wt% or less, 20 wt% or less, 15 wt% or less, or 10 wt% or less, in view of having low moisture permeability, surface hardness, scratch resistance, and bending resistance at a higher level.
In order to impart excellent surface hardness, scratch resistance, and bending resistance to the optical film of the present invention, the curable composition of the present invention preferably contains a polymerizable compound other than the polymerizable compound a, that is, a compound having no cyclic aliphatic hydrocarbon group in the molecule and having a polymerizable functional group (hereinafter, sometimes referred to as "polymerizable compound B"). It is considered that the curable composition of the present invention contains the polymerizable compound B, and thus the crosslinking density is increased, and the surface hardness, scratch resistance, and bending resistance are improved. In order to impart excellent low moisture permeability, surface hardness, scratch resistance, and bending resistance to the optical film of the present invention, the curable composition of the present invention preferably contains both the polymerizable compound a and the polymerizable compound B.
The polymerizable functional group of the polymerizable compound B is preferably an unsaturated double bond group such as a (meth) acryloyl group, a vinyl group, a styryl group, or an allyl group, and among them, (meth) acryloyl groups are preferable. Particularly preferred examples thereof include the following compounds having 2 or more (meth) acryloyl groups in 1 molecule.
The number of "polymerizable functional groups" of the polymerizable compound B is not particularly limited as long as it is 1 or more, but is preferably 2 or more, more preferably 3 or more, still more preferably 4 or more, or preferably 5 or more, 6 or more, 7 or more, 8 or more, 9 or more, or 10 or more in terms of being capable of imparting excellent surface hardness, scratch resistance, and bending resistance to the optical film of the present invention. The upper limit of the number of "polymerizable functional groups" of the polymerizable compound B is not particularly limited, and may be 30 or less, 25 or less, or 20 or less.
Examples of the polymerizable compound B include a monomer having no cyclic aliphatic hydrocarbon group in the molecule and having a polymerizable functional group (hereinafter, sometimes referred to as "polymerizable monomer B"), and an oligomer having no cyclic aliphatic hydrocarbon group in the molecule and having a polymerizable functional group (hereinafter, sometimes referred to as "polymerizable oligomer B"). The curable composition of the present invention may contain only the polymerizable monomer B, only the polymerizable oligomer B, or both the polymerizable monomer B and the polymerizable oligomer B as the polymerizable compound B. From the viewpoint of being able to form a high crosslinking density, it is preferable to contain at least the polymerizable oligomer B.
Examples of the polymerizable monomer B include hexanediol di (meth) acrylate, butanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, tris (2-hydroxyethyl) isocyanurate tri (meth) acrylate, ethoxylated trimethylolpropane tri (meth) acrylate, propoxylated trimethylolpropane tri (meth) acrylate, and the like. The curable composition of the present invention may contain 1 kind of polymerizable monomer B, or may contain 2 or more kinds of polymerizable monomers B.
The polymerizable oligomer B is a compound having 2 or more repeating units and having a polymerizable functional group. That is, the polymerizable oligomer B is a polymer having a polymerizable functional group in the molecule. Examples of the polymerizable oligomer B include urethane (meth) acrylate having 2 or more (meth) acryloyl groups added as functional groups to the urethane skeleton, polyester (meth) acrylate having 2 or more (meth) acryloyl groups added as functional groups to the polyester skeleton, and epoxy (meth) acrylate having 2 or more (meth) acryloyl groups added as functional groups to the epoxy skeleton. From the viewpoint of being able to form a high crosslinking density, it is preferable to contain at least urethane (meth) acrylate. The curable composition of the present invention may contain 1 kind of polymerizable oligomer B, or may contain 2 or more kinds of polymerizable oligomers B.
The urethane (meth) acrylate can be obtained, for example, by reacting a polyol, an isocyanate, and a hydroxy (meth) acrylate.
The polyol constituting the urethane (meth) acrylate is not limited to a known polyol, and from the viewpoint of improving the crosslinking density, a polyol having 3 or more (preferably 4 or more, more preferably 5 or more, and still more preferably 6 or more) hydroxyl groups is preferable, and trimethylolpropane, ethoxylated isocyanuric acid, pentaerythritol, dipentaerythritol, tripentaerythritol, tetrapentaerythritol, and the like are exemplified. These polyols may be used alone or in combination of 2 or more.
As the isocyanate constituting the urethane (meth) acrylate, a polyisocyanate composed of a chain saturated hydrocarbon, a cyclic saturated hydrocarbon, or an aromatic hydrocarbon can be used. Examples of such polyisocyanates include chain saturated hydrocarbon isocyanates such as tetramethylene diisocyanate, hexamethylene diisocyanate, 2, 4-trimethylhexamethylene diisocyanate, cyclic saturated hydrocarbon isocyanates such as isophorone diisocyanate, dicyclohexylmethane diisocyanate, methylenebis (4-cyclohexyl isocyanate), hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, and the like, and aromatic polyisocyanates such as 2, 4-xylylene diisocyanate, 1, 3-xylylene diisocyanate, p-xylylene diisocyanate, 3 '-dimethyl-4, 4' -diisocyanate, 6-isopropyl-1, 3-phenyl diisocyanate, and 1, 5-naphthalene diisocyanate. Preferable specific examples thereof include isophorone diisocyanate, tetramethylene diisocyanate, and hexamethylene diisocyanate. These polyisocyanates may be used alone or in combination of 2 or more.
Examples of the hydroxy (meth) acrylate constituting the urethane (meth) acrylate include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate. These hydroxy (meth) acrylates may be used alone or in combination of 2 or more.
Examples of urethane (meth) acrylates include ART-rest UN series manufactured by kagaku corporation, NK Oligo U series manufactured by new middle village chemical corporation, violet UV series manufactured by mitsubishi chemical corporation, LUXYDIR series manufactured by DIC corporation.
The polyester (meth) acrylate is obtained by, for example, reacting a terminal hydroxyl group of a polyester obtained by polymerizing a polyhydric alcohol and a polycarboxylic acid with (meth) acrylic acid. Specific examples of the polyester (meth) acrylate include ARONIX M-6000, ARONIX M-7000, ARONIX M-8000 and ARONIX M-9000 manufactured by Toyama Synthesis Co.
The epoxy (meth) acrylate is obtained, for example, by reacting an epoxy resin with (meth) acrylic acid. Specific examples of the epoxy (meth) acrylate include Ripoxy SP and Ripoxy VR manufactured by Showa Polymer Co., ltd, and epoxy esters manufactured by Kagaku chemical Co., ltd.
The weight average molecular weight of the polymerizable oligomer B is not particularly limited, but is preferably 400 or more, more preferably 500 or more, still more preferably 600 or more, and particularly preferably 700 or more, from the viewpoint of improving the surface hardness, scratch resistance, and bending resistance of the resin layer of the present invention. The weight average molecular weight of the polymerizable oligomer B is preferably 10000 or less, more preferably 7000 or less, and even more preferably 5000 or less from the viewpoint of, for example, the coatability of the curable composition of the present invention. The weight average molecular weight of the polymerizable oligomer B can be determined by, for example, high Performance Liquid Chromatography (HPLC). For example, the weight average molecular weight can be measured using HPLC8020 manufactured by Tosoh corporation as a device, 2 TSKGELGMH-H (20) columns connected in series as a column, tetrahydrofuran as a solvent, and a flow rate of 0.5 mL/min.
The content of the polymerizable compound B in the curable composition of the present invention is not particularly limited, but is preferably 5 wt% or more, more preferably 10 wt% or more, still more preferably 15 wt% or more, or may be 20 wt% or more, 25 wt% or more, 30 wt% or more, 35 wt% or more, 40 wt% or more, 45 wt% or more, 50 wt% or more, 55 wt% or more, 60 wt% or more, 65 wt% or more, 70 wt% or more, 75 wt% or more, 80 wt% or more, 85 wt% or more, 90 wt% or 95 wt% or more, with respect to 100 wt% of the nonvolatile solid content of the curable composition of the present invention, from the viewpoint of imparting excellent surface hardness, scratch resistance, and bending resistance to the resin layer of the present invention. On the other hand, the resin layer of the present invention may be 99 wt% or less, 90 wt% or less, 85 wt% or less, 80 wt% or less, 75 wt% or less, 70 wt% or less, 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, 45 wt% or less, 40 wt% or less, 35 wt% or less, 30 wt% or less, 25 wt% or less, 20 wt% or less, 15 wt% or less, 10 wt% or 5 wt% or less, in view of having low moisture permeability, surface hardness, scratch resistance, and bending resistance at a higher level.
When the curable composition of the present invention contains the polymerizable compound a and the polymerizable compound B, the ratio thereof (polymerizable compound a/polymerizable compound B) is preferably 10/90 or more, more preferably 15/85 or more, or may be 20/80 or more, 25/75 or more, 30/70 or more, 35/65 or more, 40/60 or more, 45/55 or more, 50/50 or more, 55/45 or more, 60/40 or more, 65/35 or more, 70/30 or more, 75/25 or more, 80/20 or more, 85/15 or 90/10 or more, from the viewpoint of imparting excellent low moisture permeability to the resin layer of the present invention. On the other hand, the resin layer of the present invention may be 95/5 or less, 90/10 or less, 85/15 or less, 80/20 or less, 75/25 or less, 70/30 or less, 65/35 or less, 60/40 or less, 55/45 or less, 50/50 or less, 45/55 or less, 40/60 or less, 35/65 or less, 30/70 or less, 25/75 or less, 15/85 or 10/90 or less, in view of having low moisture permeability, surface hardness, scratch resistance and bending resistance at a higher level.
The curable composition of the present invention preferably contains a polymerization initiator, and as the polymerization initiator, a photopolymerization initiator is preferred. Examples of the photopolymerization initiator include benzophenone-based compounds such as benzil, benzophenone, benzoylbenzoic acid, and 3,3' -dimethyl-4-methoxybenzophenone; aromatic ketone compounds such as 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, α -hydroxy- α, α' -dimethyl acetophenone, 2-methyl-2-hydroxy propiophenone, and α -hydroxycyclohexyl phenyl ketone; acetophenone compounds such as methoxyacetophenone, 2-dimethoxy-2-phenylacetophenone, 2-diethoxyacetophenone, 2-methyl-1- [4- (methylthio) -phenyl ] -2-morpholinopropan-1-one; benzoin alkyl ether compounds such as benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin butyl ether, anisoin methyl ether, and the like; aromatic ketal compounds such as benzildimethyl ketal; aromatic sulfonyl chloride compounds such as 2-naphthalenesulfonyl chloride; photoactive oxime-based compounds such as 1-phenyl-1, 2-propanedione-2- (o-ethoxycarbonyl) oxime; thioxanthone compounds such as thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2, 4-dimethylthioxanthone, isopropylthioxanthone, 2, 4-dichlorothioxanthone, 2, 4-diethylthioxanthone, 2, 4-diisopropylthioxanthone and dodecylthioxanthone; camphorquinone; halogenated ketones; acyl phosphine oxides; acyl phosphonates and the like. These polymerization initiators may be used alone or in combination of 2 or more.
The content of the photopolymerization initiator in the curable composition of the present invention is not particularly limited, but is preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, and even more preferably 0.2 parts by weight or more, based on 100 parts by weight of the polymerizable compound (the sum of the polymerizable compound a and the polymerizable compound B when the polymerizable compound a and the polymerizable compound B are included) in view of sufficiently obtaining low moisture permeability, surface hardness, scratch resistance, and bending resistance of the resin layer of the present invention. The content of the photopolymerization initiator in the curable composition of the present invention is preferably 10 parts by weight or less, more preferably 8 parts by weight or less, based on 100 parts by weight of the polymerizable compound (the sum of the polymerizable compound a and the polymerizable compound B when the polymerizable compound a and the polymerizable compound B are included), from the viewpoint of suppressing excessive radiation absorption due to the photopolymerization initiator and insufficient curing of the curable composition of the present invention.
Various leveling agents may be added to the curable composition of the present invention. As the leveling agent, for example, a fluorine-based or silicone-based leveling agent can be used for the purpose of preventing uneven coating (leveling of the coated surface). In the case where the surface of the resin layer of the present invention is required to have stain resistance, a leveling agent may be appropriately blended.
The amount of the leveling agent to be blended is, for example, 5 parts by weight or less, preferably in the range of 0.01 to 5 parts by weight, based on 100 parts by weight of the polymerizable compound (the sum of the polymerizable compound a and the polymerizable compound B when included).
The curable composition of the present invention may contain a solvent. As the solvent, various solvents can be used in consideration of the solubility of the polymerizable compound (polymerizable compound a and/or polymerizable compound B), the drying property at the time of coating, and the like. As the organic solvent, there is used a solvent, examples thereof include dibutyl ether, dimethoxyethane, diethoxyethane, propylene oxide, 1, 4-dioxane, 1, 3-dioxolane, 1,3, 5-trioxane, tetrahydrofuran, anisole, phenetole, dimethyl carbonate, methylethyl carbonate, diethyl carbonate, acetone, methyl Ethyl Ketone (MEK), diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone, ethyl formate, propyl formate, pentyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, gamma-butyrolactone, methyl 2-methoxyacetate, methyl 2-ethoxyacetate ethyl 2-ethoxyacetate, ethyl 2-ethoxypropionate, 2-methoxyethanol, 2-propoxyethanol, 2-butoxyethanol, 1, 2-diacetoxy acetone, acetylacetone, diacetone alcohol, methyl acetoacetate, ethyl acetoacetate, methanol, ethanol, isopropanol, n-butanol, cyclohexanol, isobutyl acetate, methyl isobutyl ketone (MIBK), 2-octanone, 2-pentanone, 2-hexanone, ethylene glycol diethyl ether, ethylene glycol isopropyl ether, ethylene glycol butyl ether, propylene glycol methyl ether, ethyl carbitol, butyl carbitol, hexane, heptane, octane, cyclohexane, methylcyclohexane, ethylcyclohexane, benzene, toluene, xylene, and the like, the number of the components may be 1 alone or 2 or more components may be used in combination.
The curable composition of the present invention may further contain any appropriate additive such as a plasticizer, a surfactant, an antioxidant, an ultraviolet absorber, a thixotropic agent, an antistatic agent, and the like, as necessary, within a range that does not impair the effects of the present invention.
The film thickness of the resin layer of the present invention is preferably 1 to 10. Mu.m. The thickness of the resin layer of 10 μm or less is preferable from the viewpoint of: when the optical film of the present invention is used as a polarizer protective film for a polarizer constituting a flexible display, the film exhibits excellent low moisture permeability even when it is folded, and can suppress occurrence of "discoloration" of the polarizer in a humidified environment; more preferably 9 μm or less, still more preferably 8 μm or less, particularly preferably 7 μm or less. The thickness of the resin layer is preferably 1 μm or more, more preferably 1.5 μm or more, still more preferably 2 μm or more, and particularly preferably 2.5 μm or more, from the viewpoint of achieving low moisture permeability, surface hardness, and scratch resistance at a high level.
The resin layer of the present invention can be formed by the following operations: the polymerizable compound (polymerizable compound a and/or polymerizable compound B) of the present invention is mixed with a photopolymerization initiator, a leveling agent, a solvent, other additives, and the like as necessary to prepare a coating liquid (curable composition of the present invention), and the coating liquid is applied to one surface of a light-transmitting substrate, dried, and cured.
The solid content concentration of the coating liquid is preferably 1 to 70 wt%, more preferably 2 to 50 wt%, and even more preferably 5 to 40 wt%.
Examples of the coating method of the coating liquid include dip coating, air knife coating, curtain coating, roll coating, wire bar coating, gravure coating, die coating, extrusion coating (extrusion coating), and bar coating.
The curing of the coating film can be appropriately selected depending on the kind of the curable composition and the like. In the case where the curable composition is photocurable, it can be cured by irradiation with light using a light source that emits light of a desired wavelength. The light to be irradiated may be, for example, light having an exposure of 150mJ/cm 2 or more, preferably 200mJ/cm 2～1000mJ/cm2. Further, heating may be performed at the time of the photo-curing treatment.
Examples of the light include ionizing radiation such as α rays, β rays, γ rays, neutron rays, and electron rays, ultraviolet rays, and the like, and ultraviolet rays are particularly preferred. The irradiation time, the irradiation method, and the like are not particularly limited, and the photopolymerization initiator may be activated to cause the reaction of the polymerizable compound.
< Polarizing plate >
The polarizing plate of the present invention has a laminated structure in which a polarizer is disposed on the side of the optical film of the present invention opposite to the resin layer. In fig. 2, the polarizing plate 20 has a laminated structure in which the polarizer 3 is disposed on the opposite side of the optical film 10 from the resin layer 1. The polarizer 20 exhibits excellent low moisture permeability, surface hardness, scratch resistance, and exhibits excellent low moisture permeability even when bent when used as a polarizer constituting a flexible display, and is less likely to cause quality deterioration such as discoloration of the polarizer 3, because the optical film 10 is used as a polarizer protective film. In the present embodiment, the 2 nd light-transmitting substrate 4 and the pressure-sensitive adhesive layer 5 are further laminated in this order on the side of the polarizer 3 opposite to the optical film 10.
The polarizer 3 is an element that passes light having a polarization plane in only a predetermined direction, and a known polarizer may be used without limitation, and for example, a polyvinyl alcohol polarizing film may be used. The polyvinyl alcohol polarizing film may be a polyvinyl alcohol film dyed with iodine or may be dyed with a dichroic dye.
The polyvinyl alcohol-based polarizing film may be a film obtained by uniaxially stretching a polyvinyl alcohol-based film and then dyeing the film with iodine or a dichroic dye (preferably a film further subjected to a durability treatment with a boron compound); the polyvinyl alcohol film may be uniaxially stretched after being dyed with iodine or a dichroic dye (preferably, a film further subjected to a durability treatment with a boron compound). The absorption axis of the polarizer is parallel to the stretching direction of the film.
The thickness of the polarizer 3 is preferably 5 to 25 μm, and more preferably 10 to 15 μm in view of reducing the thickness of the polarizing plate 20.
The 2 nd light-transmitting substrate 4 is used to protect the polarizer 3 on the side opposite to the optical film 10 (polarizer protective film), and glass, plastic film, and the like similar to the light-transmitting substrate of the present invention can be used, and cellulose-based resins, cyclic olefin-based polymers (COP), and polycarbonate-based resins are preferable, and cyclic olefin-based polymers (COP), and polycarbonate-based resins are more preferable. The light-transmitting base material 4 may be formed of the same material as the light-transmitting base material 2 or may be formed of a different material. The light-transmitting substrate 4 may be laminated with the resin layer 1 or may not have the resin layer 1. The light-transmitting substrate 4 may be formed of a single layer, or may have a laminated structure of 2 or more layers, which may be the same or different.
The light-transmitting substrate 4 is preferably an optical compensation film (retardation film) having an optical compensation layer, which includes an optically anisotropic layer. The optical compensation film can improve viewing angle characteristics of a liquid crystal display screen, for example. As the optical compensation film, a known optical compensation film can be used without limitation, and for example, a retardation film described in japanese patent application laid-open No. 2014-194484 or the like can be used.
The thickness of the light-transmitting substrate 4 is preferably 5 to 25 μm, and more preferably 10 to 15 μm in view of reducing the thickness of the polarizing plate 20.
The adhesive layer 5 is formed of any appropriate adhesive. Examples of the material constituting the pressure-sensitive adhesive layer 5 include materials having a base polymer such as an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based polymer, a rubber-based polymer, an isocyanate-based polymer, a polyvinyl alcohol-based polymer, a gelatin-based polymer, a vinyl-based polymer, a latex-based polymer, and an aqueous polyester. Among them, from the viewpoint of low moisture permeability, a material having an acrylic polymer and/or a rubber polymer as a base polymer is preferable. The adhesive layer 5 may contain a single base polymer or may contain 2 or more base polymers.
The thickness of the pressure-sensitive adhesive layer 5 is preferably 5 to 25 μm, and more preferably 10 to 20 μm in view of reducing the thickness of the polarizing plate 20.
The polarizer 20 can be obtained by bonding the polarizer 3 to the optical film 10 with an adhesive. The polarizer 3 and the light-transmitting substrate 4 may be bonded to each other with an adhesive. The adhesive used for bonding may be a completely saponified aqueous polyvinyl alcohol solution (liquid glue) or may be an active energy ray-curable adhesive.
The pressure-sensitive adhesive layer 5 can be formed by applying a pressure-sensitive adhesive composition containing a base polymer constituting a pressure-sensitive adhesive to the light-transmitting substrate 4, drying the composition, and curing the composition as necessary. Alternatively, the pressure-sensitive adhesive layer 5 may be formed on the release liner by the same procedure, and then attached to and transferred onto the light-transmitting substrate 4.
The polarizer 20 may have a layer (e.g., a surface protective film, a release liner, etc.) other than the optical film 10, the polarizer 3, the light-transmitting substrate 4, and the adhesive layer 5 on the surface or between any layers. For example, the surface of the pressure-sensitive adhesive layer 5 may be protected with a release liner, or the surface of the resin layer 1 of the optical film 10 may be protected with a surface protection film.
The thickness of the polarizer 20 (total thickness including the light-transmitting substrate 4 and the pressure-sensitive adhesive layer 5) is preferably 50 to 100 μm, and more preferably 60 to 75 μm in view of reducing the thickness of the polarizer 20.
< Image display device >
The image display device of the present invention has the polarizing plate of the present invention. The image display device of the present invention has the polarizing plate of the present invention in a laminated structure, and therefore exhibits excellent low moisture permeability, surface hardness, scratch resistance, and exhibits excellent low moisture permeability even when folded when used as a polarizing plate constituting a flexible display, and is less likely to cause quality deterioration such as discoloration of the polarizer 3. Therefore, the image display device of the present invention is suitable as a flexible display that is less likely to cause discoloration of a polarizing plate or the like in a humidified environment even when it is bent, and has excellent bending resistance and durability.
In fig. 3, the image display device 30 has an image display panel 6 laminated on the adhesive layer 5 of the polarizing plate 20. In the present embodiment, the pressure-sensitive adhesive layer 7 and the optical member 8 are laminated in this order on the resin layer 1. In the case where the image display device 30 is a flexible display, the entire laminated structure is bendable.
The image display panel 6 is not particularly limited, and examples thereof include a liquid crystal image display panel, a self-luminous image display panel (for example, an organic EL (electroluminescence) image display panel, and an LED image display panel), and a flexible display panel that is particularly bendable is preferable.
The image display panel 6 is formed by alternately arranging RGB elements, and in order to improve contrast, the elements of RGB are preferably filled with a Black Matrix (BM).
As the adhesive layer 7, a material containing the same base polymer as that exemplified in the adhesive layer 5 can be used. Among them, from the viewpoint of low moisture permeability, a material having an acrylic polymer and/or a rubber polymer as a base polymer is preferable. The adhesive layer 7 may contain a single base polymer or may contain 2 or more base polymers. The adhesive layer 7 may be made of the same material as the adhesive layer 5 or may be made of a different material.
As the optical member 8, a glass, a plastic film, or the like similar to the light-transmitting substrate of the present invention can be used, and an acrylic resin, a polyester resin, or a Cyclic Olefin Polymer (COP) is preferable, and a polyester resin is particularly preferable. The optical member 8 functions as a cover member when it is positioned on the outermost surface on the visible side of the image display device 30.
The image display device 30 may include an optical film 10, a polarizing plate 3, a light-transmitting substrate 4, an adhesive layer 5, an image display panel 6, an adhesive layer 7, and an optical member other than the optical member 8 on the surface or between any layers. The optical member is not particularly limited, and examples thereof include a polarizing plate other than the polarizing plate 3, a phase difference plate, an antireflection film, a viewing angle adjusting film, an optical compensation film, and the like. The optical member includes a member (an aesthetic film, a decorative film, a surface protection plate, etc.) that performs a decorative and protective function while maintaining visibility of the image display device and the input device.
The image display device 30 can be manufactured by laminating an optical film in which the image display panel 6, the polarizing plate 20, and the optical member 8 and the adhesive layer 7 are laminated, and specifically, can be implemented by lamination under heat and/or pressure. Curing may be performed by irradiation with active energy rays after lamination under heat and/or pressure. Irradiation with active energy rays may be performed in the same manner as the formation of the resin layer of the present invention.
Examples
Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
Example 1
(Preparation of coating liquid for Forming resin layer)
As the resin contained in the resin layer, 50 parts by weight (solid content conversion) of an ultraviolet curable acrylate resin (trade name "a-DCP", solid content 100%) and 50 parts by weight (solid content conversion) of an ultraviolet curable acrylate resin (trade name "UV-1700TL", solid content 80%) were prepared. For 100 parts by weight of the resin solid content of the resin, 5 parts by weight of a photopolymerization initiator (trade name "OMNIRAD907" manufactured by basf corporation) and 0.2 part by weight of a leveling agent (trade name "LE-303", 40% solid content manufactured by co-mingled chemical Co., ltd.) were mixed. The mixture was diluted with a MIBK/cyclopentanone mixed solvent (weight ratio 60/40) to a solid content concentration of 30%, to prepare a coating liquid for forming a resin layer.
(Preparation of optical film)
As the light-transmitting substrate, a transparent plastic film substrate (trade name "TJ25UL", manufactured by TAC, fuji film co., ltd.) was prepared. A coating film was formed on one side of the transparent plastic film base material using a bar coater #7 from the coating liquid for forming a resin layer. Then, the transparent plastic film base material on which the coating film is formed is conveyed to a drying step. In the drying step, the coating film was dried by heating at 60℃for 1 minute. Then, the film was cured by irradiating ultraviolet rays with an accumulated light amount of 220mJ/cm 2 with a high-pressure mercury lamp to form a resin layer with a thickness of 2.5. Mu.m, to obtain an optical film 1 of example 1.
Details of the resin used in example 1 are as follows.
A-DCP: tricyclodecane dimethanol dimethacrylate
UV-1700TL:10 functional urethane acrylates
Example 2
The resin contained in the resin layer was 3 parts by weight of a photopolymerization initiator (manufactured by basf corporation, trade name "OMNIRAD 907") and 0.01 part by weight of a leveling agent (manufactured by DIC corporation, trade name "PC4100", solid content 40%) per 100 parts by weight of an ultraviolet curable acrylate resin (manufactured by DIC corporation, trade name "LUXYDIR-806", solid content 80%). The mixture was diluted with a PGM/cyclopentanone mixed solvent (weight ratio 63/37) to a solid content concentration of 36% to prepare a coating liquid for forming a resin layer.
An optical film 2 of example 2 was obtained in the same manner as in example 1, except that the coating liquid for forming a resin layer prepared as described above was used to form a coating film having a thickness of 7 μm using a bar coater # 14.
Details of the resin used in example 2 are as follows.
LUXYDIR 17-806: multifunctional urethane acrylates
Example 3
An optical film 3 of example 3 was obtained in the same manner as in example 1 except that the coating liquid for forming a resin layer prepared in example 2 was used to form a coating film having a thickness of 7 μm on a transparent plastic film substrate (product name "KC2UA" manufactured by TAC, konikamida co.) using a bar coater # 14.
Example 4
An optical film 4 of example 4 was obtained in the same manner as in example 1, except that the coating liquid for forming a resin layer prepared in example 2 was used to form a coating film having a thickness of 7 μm on one side of a transparent plastic film substrate (manufactured by TAC, fuji film co., trade name "TJ40 UL") by means of a bar coater # 14.
Comparative example 1
The resin contained in the resin layer was 0.1 part by weight of a leveling agent (trade name "LE-303", solid content 40%) was mixed with 100 parts by weight of an ultraviolet curable acrylate resin (trade name "OPSTAR Z7540", solid content 56% manufactured by Kagaku chemical Co., ltd.). The mixture was diluted with MEK to a solid content concentration of 55%, and a coating liquid for forming a resin layer was prepared.
An optical film 5 of comparative example 1 was obtained in the same manner as in example 1 except that a coating film having a thickness of 20 μm was formed on one side of a transparent plastic film substrate (product name "KC8UAW" manufactured by TAC, konika meida corporation) using a bar coater # 36.
Details of the resin used in comparative example 1 are as follows.
OPSTAR Z7540: particle-containing multifunctional urethane acrylates
Comparative example 2
An optical film 6 of comparative example 2 was obtained in the same manner as in example 1 except that a coating film having a thickness of 20 μm was formed on one side of a transparent plastic film substrate (TAC, product name "KC8UAW", manufactured by konikama america corporation) using a bar coater # 50.
(Evaluation)
The optical films obtained in the above examples and comparative examples were used for the following evaluation. The evaluation method is shown below. The results are shown in Table 1.
(1) Film thickness measurement
The film thicknesses of the optical films of examples and comparative examples were measured at 5 points with respect to the width using a digital linear meter (DIGITAL LINEAR gauge, trade name "MODELD-10HS", manufactured by Kyowa Co., ltd.) and the average value of the film thicknesses at 5 points was taken as the total thickness. The film thicknesses of the light-transmitting substrates used in examples and comparative examples were measured by the same measurement method, and the average value of the film thicknesses at 5 points was used as the substrate thickness. The difference between the total thickness and the thickness of the base material was used as the thickness of the resin layer.
(2) Moisture permeability measurement
The optical films of examples and comparative examples were measured for moisture permeability at a temperature of 40℃and a relative humidity of 92% in accordance with JIS Z0208.
The optical films of examples and comparative examples were subjected to the following bending test, and then the moisture permeability was measured in the same manner.
Bending test
The optical films of examples and comparative examples were tested according to JIS K5600-5-1 using a mandrel having a diameter of 2mm so that the resin layer was located outside.
In addition, whether or not the surface of the resin layer after the bending test was cracked was visually examined under the LED lighting environment.
The appearance of the optical film after the bending test was evaluated according to the following criteria.
And (2) the following steps: visually failing to identify the crack
X: to visually recognize cracks or film breakage
(3) Hardness and elastic modulus based on nano indentation method
For the optical films of examples and comparative examples, films cut to about 1cm square were fixed to a support (glass slide, manufactured by Song Nitro Co., ltd.) as a sample for measuring nanoindentation, and nanoindentation was measured under the following conditions to obtain a load-displacement curve.
Nanoindentation measurement conditions
The device comprises: triboinditer manufactured by Hysicron Inc
Using a pressure head: berkovich (triangular pyramid)
The measuring method comprises the following steps: single press-in assay
Measuring temperature: room temperature
Depth of press-in: 100nm of
The hardness H is calculated from the load (maximum load P max) when the indenter is pushed to the pushed depth and the contact area (contact projection area Ac) between the indenter and the sample at this time, using the following formula (1).
The elastic modulus Er is calculated from the slope of the tangent line at the time of maximum load of the unloading curve of the load-displacement curve (contact stiffness S) and the contact area (contact projected area Ac) of the indenter and the sample at this time, using the following expression (2).
(4) Evaluation of color fading of polarizer after bending test
The optical films of examples and comparative examples after the above bending test were stored at a temperature of 60℃and a relative humidity of 90% for 120 hours, and when the films were observed in a dark room with the illuminance of the backlight set to 8000 candelas, the color unevenness and discoloration such as streaks were recognized, and the polarizer was judged to have discoloration.
(Table 1)
* : The moisture permeability cannot be measured due to breakage in the bending test
Various modifications of the present invention will be described below.
[ Additional note 1] an optical film comprising a light-transmitting substrate and a resin layer laminated on one surface of the light-transmitting substrate,
The resin layer is formed from a cured product of a curable composition containing at least 1 polymerizable compound selected from the group consisting of a monomer having a polymerizable functional group and an oligomer having a polymerizable functional group,
The absolute value (|M 2-M1 |) of the difference between the moisture permeability M 1[g/m2.24h of the optical film in the environment of 40 ℃ and 92% relative humidity before the bending test and the moisture permeability M 2[g/m2.24h of the optical film in the environment of 92% relative humidity after the bending test is less than 10g/M 2.24h.
Bending test:
according to JIS K5600-5-1, the optical film was tested using a mandrel having a diameter of 2mm so that the resin layer was positioned outside.
The optical film according to item 1, wherein the resin layer has a film thickness of 1 to 10. Mu.m.
The optical film according to any one of the additional notes 1 or 2, wherein the light-transmitting substrate has a film thickness of 10 to 50. Mu.m.
The optical film according to any one of the additional notes 1 to 3, wherein the product (H×T) of the hardness H [ GPa ] of the resin layer by nanoindentation and the thickness T [ mu ] m of the optical film is 40 or less.
The optical film according to any one of supplementary notes 5 to 1 to 3, wherein a product (er×t) of an elastic modulus Er (GPa) of the resin layer by a nanoindentation method and a thickness T (μm) of the optical film is 600 or less.
The optical film according to any one of supplementary notes 6 to 1 to 5, wherein the light-transmitting substrate comprises at least 1 selected from the group consisting of cellulose-based resins, polyester-based resins, acrylic-based resins, and cyclic olefin-based polymers.
[ Additional note 7] A polarizing plate comprising a polarizer disposed on the side of the optical film according to any one of additional notes 1 to 6 opposite to the resin layer.
[ Appendix 8] an image display device having the polarizing plate described in appendix 7.
The image display device according to item 8, wherein an adhesive layer and an optical member are laminated in this order on the resin layer.
The image display device according to any one of supplementary notes 8 to 9, which is a flexible display.
Symbol description
10. Optical film
1. Resin layer
2. Light-transmitting base material
20. Polarizing plate
3. Polarizer
4. Light-transmitting base material (optical compensation film)
5. Adhesive layer
30. Image display device
6. Image display panel
7. Adhesive layer
8. An optical member.
Claims (10)
1. An optical film comprising a resin layer laminated on one surface of a light-transmitting substrate,
The resin layer is formed from a cured product of a curable composition containing at least 1 polymerizable compound selected from the group consisting of a monomer having a polymerizable functional group and an oligomer having a polymerizable functional group,
The absolute value |M 2-M1 | of the difference between the moisture permeability M 1[g/m2.24h of the optical film in the environment with the relative humidity of 92% at 40 ℃ before the bending test and the moisture permeability M 2[g/m2.24h of the optical film in the environment with the relative humidity of 92% at 40 ℃ after the bending test is less than 10g/M 2.24h,
Bending test:
The optical film was tested according to JIS K5600-5-1 using a mandrel having a diameter of 2mm so that the resin layer was positioned outside.
2. An optical film according to claim 1, wherein the resin layer has a film thickness of 1 to 10 μm.
3. The optical film according to claim 1 or 2, wherein the film thickness of the light-transmitting substrate is 10 to 50 μm.
4. An optical film according to any one of claims 1 to 3, wherein the product H x T of the nano-indentation-based hardness H [ GPa ] of the resin layer and the thickness T [ μm ] of the optical film is 40 or less.
5. An optical film according to any one of claims 1 to 3, wherein the product Er x T of the nanoindentation-based elastic modulus Er (GPa) of the resin layer and the thickness T (μm) of the optical film is 600 or less.
6. The optical film according to any one of claims 1 to 5, wherein the light-transmitting substrate comprises at least 1 selected from the group consisting of cellulose-based resins, polyester-based resins, acrylic-based resins, and cyclic olefin-based polymers.
7. A polarizing plate comprising a polarizer disposed on the opposite side of the optical film according to any one of claims 1 to 6 to the resin layer.
8. An image display device having the polarizing plate according to claim 7.
9. The image display device according to claim 8, wherein an adhesive layer and an optical member are laminated in this order on the resin layer.
10. The image display device according to claim 8 or 9, which is a flexible display.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-191304 | 2021-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118302700A true CN118302700A (en) | 2024-07-05 |
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