CN112041715A - Method for manufacturing polarizer, method for manufacturing polarizing film, method for manufacturing laminated polarizing film, method for manufacturing image display panel, and method for manufacturing image display device - Google Patents
Method for manufacturing polarizer, method for manufacturing polarizing film, method for manufacturing laminated polarizing film, method for manufacturing image display panel, and method for manufacturing image display device Download PDFInfo
- Publication number
- CN112041715A CN112041715A CN202080002447.6A CN202080002447A CN112041715A CN 112041715 A CN112041715 A CN 112041715A CN 202080002447 A CN202080002447 A CN 202080002447A CN 112041715 A CN112041715 A CN 112041715A
- Authority
- CN
- China
- Prior art keywords
- film
- polyvinyl alcohol
- polarizer
- manufacturing
- polarizing film
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims description 53
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 143
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 143
- 238000001035 drying Methods 0.000 claims abstract description 90
- 239000011701 zinc Substances 0.000 claims abstract description 46
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 46
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000004132 cross linking Methods 0.000 claims abstract description 35
- 238000004043 dyeing Methods 0.000 claims abstract description 34
- 238000011282 treatment Methods 0.000 claims abstract description 28
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims description 34
- 239000010410 layer Substances 0.000 claims description 32
- 239000000853 adhesive Substances 0.000 claims description 23
- 230000001070 adhesive effect Effects 0.000 claims description 21
- 239000012790 adhesive layer Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 claims description 13
- 230000035699 permeability Effects 0.000 claims description 9
- 230000010287 polarization Effects 0.000 abstract description 17
- 238000010438 heat treatment Methods 0.000 abstract description 14
- 230000005856 abnormality Effects 0.000 abstract description 13
- 239000010408 film Substances 0.000 description 257
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 57
- 229920005989 resin Polymers 0.000 description 22
- 239000011347 resin Substances 0.000 description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 230000008961 swelling Effects 0.000 description 18
- 238000004140 cleaning Methods 0.000 description 14
- 239000004973 liquid crystal related substance Substances 0.000 description 14
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 12
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 11
- 239000011630 iodine Substances 0.000 description 11
- 229910052740 iodine Inorganic materials 0.000 description 11
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 11
- 229960001763 zinc sulfate Drugs 0.000 description 11
- 229910000368 zinc sulfate Inorganic materials 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 210000002858 crystal cell Anatomy 0.000 description 10
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 9
- 239000007864 aqueous solution Substances 0.000 description 9
- 150000003751 zinc Chemical class 0.000 description 9
- 238000007127 saponification reaction Methods 0.000 description 8
- -1 zinc halides Chemical class 0.000 description 8
- UAYWVJHJZHQCIE-UHFFFAOYSA-L zinc iodide Chemical compound I[Zn]I UAYWVJHJZHQCIE-UHFFFAOYSA-L 0.000 description 8
- 125000002339 acetoacetyl group Chemical group O=C([*])C([H])([H])C(=O)C([H])([H])[H] 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 238000006116 polymerization reaction Methods 0.000 description 7
- 229910052721 tungsten Inorganic materials 0.000 description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 6
- 150000001639 boron compounds Chemical class 0.000 description 6
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 6
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 5
- 239000004327 boric acid Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 238000007654 immersion Methods 0.000 description 5
- 238000010030 laminating Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000000007 visual effect Effects 0.000 description 5
- 239000004925 Acrylic resin Substances 0.000 description 4
- 229920000178 Acrylic resin Polymers 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 229920002284 Cellulose triacetate Polymers 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 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 3
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- 229920000058 polyacrylate Polymers 0.000 description 3
- 229920005668 polycarbonate resin Polymers 0.000 description 3
- 239000004431 polycarbonate resin Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229920005672 polyolefin resin Polymers 0.000 description 3
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 3
- 239000004246 zinc acetate Substances 0.000 description 3
- 239000011592 zinc chloride Substances 0.000 description 3
- 235000005074 zinc chloride Nutrition 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Chemical compound [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 description 2
- 230000010534 mechanism of action Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- AGNTUZCMJBTHOG-UHFFFAOYSA-N 3-[3-(2,3-dihydroxypropoxy)-2-hydroxypropoxy]propane-1,2-diol Chemical compound OCC(O)COCC(O)COCC(O)CO AGNTUZCMJBTHOG-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- UNMYWSMUMWPJLR-UHFFFAOYSA-L Calcium iodide Chemical compound [Ca+2].[I-].[I-] UNMYWSMUMWPJLR-UHFFFAOYSA-L 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- MBHRHUJRKGNOKX-UHFFFAOYSA-N [(4,6-diamino-1,3,5-triazin-2-yl)amino]methanol Chemical compound NC1=NC(N)=NC(NCO)=N1 MBHRHUJRKGNOKX-UHFFFAOYSA-N 0.000 description 1
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 150000001241 acetals Chemical class 0.000 description 1
- 230000010933 acylation Effects 0.000 description 1
- 238000005917 acylation reaction Methods 0.000 description 1
- 150000001336 alkenes Chemical group 0.000 description 1
- 125000005907 alkyl ester group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- CECABOMBVQNBEC-UHFFFAOYSA-K aluminium iodide Chemical compound I[Al](I)I CECABOMBVQNBEC-UHFFFAOYSA-K 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- SGUXGJPBTNFBAD-UHFFFAOYSA-L barium iodide Chemical compound [I-].[I-].[Ba+2] SGUXGJPBTNFBAD-UHFFFAOYSA-L 0.000 description 1
- 229910001638 barium iodide Inorganic materials 0.000 description 1
- 229940075444 barium iodide Drugs 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 229910001640 calcium iodide Inorganic materials 0.000 description 1
- 229940046413 calcium iodide Drugs 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- GBRBMTNGQBKBQE-UHFFFAOYSA-L copper;diiodide Chemical compound I[Cu]I GBRBMTNGQBKBQE-UHFFFAOYSA-L 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010227 cup method (microbiological evaluation) Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229940105990 diglycerin Drugs 0.000 description 1
- GPLRAVKSCUXZTP-UHFFFAOYSA-N diglycerol Chemical compound OCC(O)COCC(O)CO GPLRAVKSCUXZTP-UHFFFAOYSA-N 0.000 description 1
- WASQWSOJHCZDFK-UHFFFAOYSA-N diketene Chemical compound C=C1CC(=O)O1 WASQWSOJHCZDFK-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 150000002596 lactones Chemical group 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- JFNLZVQOOSMTJK-KNVOCYPGSA-N norbornene Chemical compound C1[C@@H]2CC[C@H]1C=C2 JFNLZVQOOSMTJK-KNVOCYPGSA-N 0.000 description 1
- 125000003518 norbornenyl group Chemical group C12(C=CC(CC1)C2)* 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229920005573 silicon-containing polymer Polymers 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 235000009518 sodium iodide Nutrition 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- QPBYLOWPSRZOFX-UHFFFAOYSA-J tin(iv) iodide Chemical compound I[Sn](I)(I)I QPBYLOWPSRZOFX-UHFFFAOYSA-J 0.000 description 1
- NLLZTRMHNHVXJJ-UHFFFAOYSA-J titanium tetraiodide Chemical compound I[Ti](I)(I)I NLLZTRMHNHVXJJ-UHFFFAOYSA-J 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 125000006617 triphenylamine group Chemical group 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00634—Production of filters
- B29D11/00644—Production of filters polarizing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0073—Optical laminates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
- B29D11/00788—Producing optical films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00865—Applying coatings; tinting; colouring
- B29D11/00894—Applying coatings; tinting; colouring colouring or tinting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H20/00—Advancing webs
- B65H20/02—Advancing webs by friction roller
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2029/00—Use of polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals or derivatives thereof as moulding material
- B29K2029/04—PVOH, i.e. polyvinyl alcohol
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/17—Nature of material
- B65H2701/175—Plastic
- B65H2701/1752—Polymer film
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Theoretical Computer Science (AREA)
- Polarising Elements (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
Abstract
A method for producing a polarizer, comprising performing a drying step after at least a dyeing step, a crosslinking step and a stretching step on a polyvinyl alcohol film, wherein at least one treatment bath contains zinc ions, the drying step is a step of drying the polyvinyl alcohol film containing zinc while conveying the film by a plurality of rollers, the plurality of rollers include 1 or more third rollers provided between a first roller provided on the most upstream side and a second roller provided on the most downstream side, and the wrap angle between the polyvinyl alcohol film and the roller of at least 1 roller among the 1 or more third rollers is 90 DEG or less, thereby producing a polarizer having a thickness of 20 [ mu ] m or less and a moisture content of 13% by weight or more and 19% by weight or less. The manufacturing method can obtain a thin polarizing element which is inhibited from appearance abnormality (uneven polarization) and breakage in a drying process and has heating durability.
Description
Technical Field
The present invention relates to a method for manufacturing a polarizer, a method for manufacturing a polarizing film, a method for manufacturing a laminated polarizing film, a method for manufacturing an image display panel, and a method for manufacturing an image display device.
Background
Conventionally, a dyed (dichroic material-containing) polyvinyl alcohol film has been used as a polarizer used in various image display devices such as liquid crystal display devices and organic EL display devices, in order to achieve both high transmittance and high polarization degree. The polarizer is produced by subjecting a polyvinyl alcohol film to various treatments such as dyeing, crosslinking, and stretching in a bath, and then drying the film. The polarizer is generally used in the form of a polarizing film (polarizing plate) obtained by laminating a protective film such as triacetylcellulose on one or both surfaces thereof using an adhesive.
The polarizing film is used in the form of a laminated polarizing film (optical laminate) in which other optical layers are laminated as necessary, and the polarizing film or the laminated polarizing film (optical laminate) is bonded between an image display unit such as a liquid crystal cell or an organic EL element and a transparent plate such as a front panel or a touch panel on the visual recognition side via an adhesive layer, and is used as the various image display devices described above.
On the other hand, it is known that a polarizer contains zinc from the viewpoint of improving heating durability and the like (patent documents 1 to 6). It is also known that: in the drying step for producing a polarizing material, a polyvinyl alcohol film is dried while being conveyed by a plurality of rollers, thereby obtaining a polarizing material (patent documents 7 to 10).
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2009-42457
Patent document 2: japanese laid-open patent publication No. 2009-42455
Patent document 3: japanese patent laid-open publication No. 2006 and 317747
Patent document 4: japanese patent laid-open No. 2006 and 47978
Patent document 5: japanese patent laid-open publication No. 2004-61565
Patent document 6: japanese patent laid-open publication No. 2003-270439
Patent document 7: japanese laid-open patent publication No. 2014-199284
Patent document 8: japanese laid-open patent publication No. 2012-47799
Patent document 9: japanese patent laid-open No. 2012-14001
Patent document 10: japanese laid-open patent publication No. 2009-163202
Disclosure of Invention
Problems to be solved by the invention
In recent years, with the expansion of applications to various image display devices such as those described above (mobile devices such as mobile phones and tablet terminals, car navigation devices, and in-vehicle image display devices such as back-monitors), the polarizing films used therein are required to have higher quality and higher performance, and in particular, thin polarizers having durability to heating are strongly desired.
On the other hand, the polarizer obtained by the manufacturing method disclosed in the above-mentioned patent document has good optical characteristics. However, it can be seen that: when a thin polarizer containing zinc is manufactured by the method for manufacturing a polarizer disclosed in the above-mentioned patent document, there are the following problems: the obtained polarizer had appearance abnormality (uneven polarization) on its surface in the drying step, or had insufficient heating durability despite the fact that the polarizer contained zinc.
In view of the above circumstances, an object of the present invention is to provide a method for manufacturing a polarizer, which can obtain a thin polarizer having durability to heating, while suppressing appearance defects (uneven polarization) and breakage occurring in a drying process.
Means for solving the problems
That is, the present invention relates to a method for producing a polarizer, comprising a step of subjecting a polyvinyl alcohol film to at least a dyeing step, a crosslinking step and a stretching step, and then a drying step, wherein a treatment bath of at least one of the dyeing step, the crosslinking step and the stretching step contains zinc ions, and the drying step is a step of drying the polyvinyl alcohol film containing zinc while conveying the film by a plurality of rolls to produce a polarizer having a thickness of 20 μm or less and a water content of 13 wt% or more and 19 wt% or less, wherein the plurality of rolls comprise: the film forming apparatus comprises a first roll disposed on the most upstream side in the conveying direction of a polyvinyl alcohol film, a second roll disposed on the most downstream side in the conveying direction of the polyvinyl alcohol film, and 1 or more third rolls disposed between the first roll and the second roll, wherein the wrap angle between the roll of at least 1 roll and the polyvinyl alcohol film is 90 DEG or less among the 1 or more third rolls.
Further, the present invention relates to a method for manufacturing a polarizing film, comprising: and a step of bonding a transparent protective film to at least one surface of the polarizing material obtained by the method for producing a polarizing material via an adhesive layer.
Further, the present invention relates to a method for manufacturing a laminated polarizing film, comprising: and a step of bonding an optical layer to the polarizing film obtained by the method for producing a polarizing film.
Further, the present invention relates to a method for manufacturing an image display panel, comprising: and a step of bonding the polarizing film obtained by the method for producing a polarizing film or the laminated polarizing film obtained by the method for producing a laminated polarizing film to an image display unit.
Further, the present invention relates to a method for manufacturing an image display device, including: and a step of providing a transparent plate on the polarizing film or laminated polarizing film side of the image display panel obtained by the method for producing an image display panel.
ADVANTAGEOUS EFFECTS OF INVENTION
The detailed mechanism of action of the effect in the method for producing a polarizing plate of the present invention is not clear, and the following is presumed. However, the present invention should not be construed as being limited to this mechanism of action.
The method for producing a polarizer of the present invention is a method for producing a polarizer, which comprises subjecting a polyvinyl alcohol film to at least a dyeing step, a crosslinking step and a stretching step, and then to a drying step, wherein a treatment bath of at least one of the dyeing step, the crosslinking step and the stretching step contains zinc ions, and the drying step is a step of drying the polyvinyl alcohol film containing zinc while conveying the film by a plurality of rolls to produce a polarizer having a thickness of 20 μm or less and a moisture content of 13 wt% or more and 19 wt% or less, wherein the plurality of rolls comprise: the film forming apparatus comprises a first roll disposed on the most upstream side in the conveying direction of a polyvinyl alcohol film, a second roll disposed on the most downstream side in the conveying direction of the polyvinyl alcohol film, and 1 or more third rolls disposed between the first roll and the second roll, wherein the wrap angle between the roll of at least 1 roll and the polyvinyl alcohol film is 90 DEG or less among the 1 or more third rolls. In the present invention, the moisture content of the obtained thin polarizer is adjusted to the above-described value in the drying step, whereby the appearance abnormality (polarization unevenness) occurring in the drying step can be suppressed, and the heating durability of the thin polarizer can be improved.
The reason is presumably that since a polarizer containing a water content of at least a certain level has flexibility as compared with a polarizer having a low water content, it is possible to suppress appearance abnormality (polarization unevenness) due to surface deformation of the polarizer caused by crushing of zinc deposited on the surface of the polyvinyl alcohol-based film by a roller (roll pressing) in the drying step. And presumes that: the polarizer containing a water content of not more than a certain value has durability to heating because the total water content in the polarizer is small and deterioration of the polarizer due to moisture in the polarizer by a heat resistance test can be suppressed. In particular, when a protective film having a low moisture permeability is used as the protective film of the polarizing film, moisture in the polarizing element is difficult to permeate to the outside, and therefore, the polarizing element of the present invention is useful for such a configuration.
Further, the present invention is characterized in that the wrap angle between the roll and the polyvinyl alcohol film is adjusted to be equal to or less than a predetermined value so as to reduce the contact time between the polyvinyl alcohol film and the roll (conveying roll) so as to avoid the influence of the above-described rolling and suppress the above-described appearance abnormality (polarization unevenness). In particular, it can be assumed that: by adjusting the wrap angle between the third roll and the polyvinyl alcohol film to a certain value or less during the drying of the polarizer, the appearance abnormality (polarization unevenness) can be suppressed. The first roll and the second roll are rolls immediately after drying and immediately before finishing drying, and it is presumed that the roll nip is less affected by the holding angle in the drying operation (treatment).
Further, it can be presumed that: in the present invention, since the third roll is provided in the drying step, the distance (free running distance) between adjacent rolls is not excessively long, and therefore, the polyvinyl alcohol film during conveyance is less likely to be deflected, and therefore, the occurrence of breakage of the polarizer can be suppressed.
It can be further assumed that: in the present invention, the ratio (contact distance/total transport distance) of the contact distance of the zinc-containing polyvinyl alcohol film with respect to the third roll to the total transport distance of the zinc-containing polyvinyl alcohol film is adjusted to 0.1 or less in the drying step, whereby the contact time between the polyvinyl alcohol film and the roll (transport roll) can be reduced, and thus, the appearance abnormality (uneven polarization) due to the surface deformation of the polarizer can be further suppressed.
It can be further assumed that: the present invention is characterized in that the maximum distance (L) between the rollers is setMAX) And the width (W) of the zinc-containing polyvinyl alcohol film before the drying step1) Ratio of (L)MAX/W1) By adjusting the pressure to 2 or less, the occurrence of breaking of the polyvinyl alcohol film occurring between the transport distances (idle running distances) of the polyvinyl alcohol film between adjacent rollers can be further suppressed.
It can be presumed that: the polarizer obtained by the production method of the present invention has a width (W) of the zinc-containing polyvinyl alcohol film before the drying step1) And the width (W) of the polarizer obtained after the drying step2) Ratio of (W)2/W1) The amount is 0.9 or more and less than 1, and therefore, shrinkage of the polarizer in the width direction in the drying step can be suppressed, and generation of wrinkles and the like at the end of the polarizer can be suppressed.
Drawings
FIG. 1 is a schematic view showing the wrap angle between a roll of the present invention and a polyvinyl alcohol film.
FIG. 2 is a schematic view showing one embodiment of the drying step of the present invention.
Fig. 3 is a schematic diagram showing the drying steps used in comparative examples 3 and 7.
Fig. 4 is a schematic diagram showing a drying step used in comparative example 4.
FIG. 5 is a schematic view showing a drying step used in example 5.
Detailed Description
< method for producing polarizing plate >
The method for producing a polarizer of the present invention is a method for producing a polarizer, which comprises subjecting a polyvinyl alcohol film to at least a dyeing step, a crosslinking step and a stretching step, and then to a drying step, wherein a treatment bath of at least one of the dyeing step, the crosslinking step and the stretching step contains zinc ions, and the drying step is a step of drying the polyvinyl alcohol film containing zinc while conveying the film by a plurality of rolls to produce a polarizer having a thickness of 20 μm or less and a moisture content of 13 wt% or more and 19 wt% or less, wherein the plurality of rolls comprise: the film forming apparatus comprises a first roll disposed on the most upstream side in the conveying direction of a polyvinyl alcohol film, a second roll disposed on the most downstream side in the conveying direction of the polyvinyl alcohol film, and 1 or more third rolls disposed between the first roll and the second roll, wherein the wrap angle between the roll of at least 1 roll and the polyvinyl alcohol film is 90 DEG or less among the 1 or more third rolls.
The polyvinyl alcohol (PVA) film may be a film having light transmittance in the visible light region and having a dichroic substance such as iodine or a dichroic dye dispersed and adsorbed therein, without any particular limitation. In general, the PVA film used as the base material has a thickness of preferably about 10 to 100. mu.m, more preferably about 15 to 80 μm, and still more preferably about 20 to 60 μm, and a width of preferably about 100 to 5000 mm.
Examples of the material of the polyvinyl alcohol-based film include polyvinyl alcohol and derivatives thereof. Examples of the derivative of the polyvinyl alcohol include polyvinyl formal, polyvinyl acetal; and materials modified with olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid and crotonic acid, alkyl esters thereof, acrylamide, and the like. The polyvinyl alcohol preferably has an average polymerization degree of about 100 to 10,000, more preferably about 1,000 to 10,000, and still more preferably about 2,000 to 4,500. The saponification degree of the polyvinyl alcohol is preferably about 80 to 100 mol%, more preferably about 95 to 99.95 mol%. The average polymerization degree and the saponification degree can be determined according to JIS K6726.
The polyvinyl alcohol film may contain additives such as a plasticizer and a surfactant. Examples of the plasticizer include polyhydric alcohols such as glycerin, diglycerin, triglycerol, ethylene glycol, propylene glycol, and polyethylene glycol, and condensates thereof. The amount of the additive is not particularly limited, and is preferably about 20% by weight or less in the polyvinyl alcohol film.
The method for producing a polarizing plate of the present invention is a method for producing a polyvinyl alcohol film by performing at least a dyeing step, a crosslinking step and a stretching step on the polyvinyl alcohol film and then performing a drying step, wherein a treatment bath of at least one of the dyeing step, the crosslinking step and the stretching step contains zinc ions. By adding zinc ions to the treatment bath in at least 1 step, zinc can be added to the polyvinyl alcohol film, and the obtained polarizer can contain zinc.
< dyeing step >
The dyeing step is a treatment step of immersing the polyvinyl alcohol film in a dyeing bath (iodine solution), and the polyvinyl alcohol film can be aligned by adsorbing a dichroic substance such as iodine or a dichroic dye. The iodine solution is preferably an aqueous iodine solution containing iodine and an iodide as a dissolution aid. The iodide includes potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, titanium iodide, and the like. Among these, potassium iodide is suitable.
The concentration of iodine in the dyeing bath is preferably about 0.01 to 1 wt%, more preferably about 0.02 to 0.5 wt%. In the dyeing bath, the concentration of the iodide is preferably about 0.01 to 10% by weight, more preferably about 0.05 to 5% by weight.
When the dyeing bath contains zinc ions, it is preferable to use zinc salts. Examples of the zinc salt include zinc halides such as zinc chloride and zinc iodide; inorganic zinc salts such as zinc sulfate and zinc acetate. Among these, zinc sulfate is suitable. The concentration of the zinc ions in the dyeing bath is preferably about 0.1 to 10% by weight, more preferably about 0.3 to 7% by weight, and still more preferably about 0.5 to 3% by weight.
The temperature of the dyeing bath is preferably about 10 to 50 ℃, and more preferably about 15 to 45 ℃. The time for immersion in the dyeing bath cannot be generally defined because the degree of dyeing of the polyvinyl alcohol film is affected by the temperature of the dyeing bath, and is preferably about 10 to 300 seconds, more preferably about 20 to 240 seconds. The dyeing step may be performed only 1 time, or may be performed a plurality of times as needed.
< crosslinking step >
The crosslinking step is a treatment step of immersing the polyvinyl alcohol film dyed in the dyeing step in a treatment bath (crosslinking bath) containing a boron compound, and the polyvinyl alcohol film is crosslinked by the boron compound, so that iodine molecules or dye molecules can be adsorbed to the crosslinked structure. Examples of the boron compound include boric acid, borate, and borax. The crosslinking bath is usually an aqueous solution, and may be, for example, a mixed solution of an organic solvent miscible with water and water. The crosslinking bath may contain an iodide such as potassium iodide.
The concentration of the boron compound in the crosslinking bath is preferably about 1 to 15 wt%, more preferably about 1.5 to 10 wt%, and still more preferably about 2 to 5 wt%. When an iodide such as potassium iodide is used in the crosslinking bath, the concentration of the iodide such as potassium iodide in the crosslinking bath is preferably about 1 to 15 wt%, more preferably about 1.5 to 10 wt%.
When the crosslinking bath contains zinc ions, it is preferable to use zinc salts. Examples of the zinc salt include zinc halides such as zinc chloride and zinc iodide; inorganic zinc salts such as zinc sulfate and zinc acetate. Among these, zinc sulfate is suitable. The concentration of the zinc ions in the crosslinking bath is preferably about 0.1 to 10% by weight, more preferably about 0.3 to 7% by weight, and still more preferably about 0.5 to 3% by weight.
The temperature of the crosslinking bath is preferably about 20 to 70 ℃, more preferably about 30 to 60 ℃. The time for immersion in the crosslinking bath cannot be generally defined because the degree of crosslinking of the polyvinyl alcohol film is affected by the temperature of the crosslinking bath, and is preferably about 5 to 300 seconds, more preferably about 10 to 200 seconds. The crosslinking step may be performed only 1 time, or may be performed a plurality of times as needed.
< stretching step >
The stretching step is a treatment step of stretching the polyvinyl alcohol film to a predetermined magnification in at least one direction. In general, a polyvinyl alcohol film is uniaxially stretched in the transport direction (longitudinal direction). The stretching method is not particularly limited, and a wet stretching method or a dry stretching method (an inter-roll stretching method, a heated roll stretching method, a compression stretching method, or the like) can be used. The stretching step may be performed only 1 time, or may be performed a plurality of times as needed. The stretching step may be performed at any stage in the production of the polarizer.
In the wet stretching method, a solvent such as water or a mixed solution of an organic solvent miscible with water and water is usually used as the treatment bath (stretching bath). The stretching bath may contain an iodide such as potassium iodide. When an iodide such as potassium iodide is used in the stretching bath, the concentration of the iodide such as potassium iodide in the stretching bath is preferably about 1 to 15% by weight, more preferably about 2 to 10% by weight. In addition, the boron compound may be contained in the treatment bath (stretching bath) in order to increase the degree of crosslinking, and in this case, the concentration of the boron compound in the stretching bath is preferably about 1 to 15% by weight, and more preferably about 1.5 to 10% by weight.
When the stretching bath contains zinc ions, it is preferable to use zinc salts. Examples of the zinc salt include zinc halides such as zinc chloride and zinc iodide; inorganic zinc salts such as zinc sulfate and zinc acetate. Among these, zinc sulfate is suitable. The concentration of the zinc ions in the stretching bath is preferably about 0.1 to 10 wt%, more preferably about 0.3 to 7 wt%, and still more preferably about 0.5 to 3 wt%.
The temperature of the stretching bath is preferably about 25 to 80 ℃, and more preferably about 40 to 75 ℃. The time for immersion in the stretching bath cannot be generally defined because the degree of stretching of the polyvinyl alcohol film is affected by the temperature of the stretching bath, but is preferably about 10 to 800 seconds, and more preferably about 30 to 500 seconds. The stretching treatment in the wet stretching method may be performed simultaneously with any one or more treatment steps among the dyeing step, the crosslinking step, the swelling step, and the washing step.
The total draw ratio (cumulative draw ratio) of the polyvinyl alcohol film may be set as appropriate depending on the purpose, and is preferably about 2 to 7 times, more preferably about 3 to 6.8 times, and still more preferably about 3.5 to 6.5 times.
The method for producing a polarizing plate of the present invention is a method for producing a polyvinyl alcohol film by performing at least the dyeing step, the crosslinking step, and the stretching step on the polyvinyl alcohol film and then performing the drying step on the polyvinyl alcohol film, but the swelling step may be performed before the dyeing step, or the washing step may be performed before the drying step.
< swelling step >
The swelling step is a treatment step of immersing the polyvinyl alcohol film in a swelling bath, and can remove dirt, blocking agents, and the like on the surface of the polyvinyl alcohol film, and can suppress uneven dyeing by swelling the polyvinyl alcohol film. The swelling bath generally uses a medium containing water as a main component, such as water, distilled water, or pure water. The swelling bath may be added with a surfactant, an alcohol, or the like as appropriate according to a conventional method.
The temperature of the swelling bath is preferably about 10 to 60 ℃, and more preferably about 15 to 45 ℃. The time for immersion in the swelling bath cannot be generally defined because the swelling degree of the polyvinyl alcohol film is affected by the temperature of the swelling bath, and is preferably about 5 to 300 seconds, more preferably about 10 to 200 seconds. The swelling step may be performed only 1 time, or may be performed a plurality of times as needed.
< cleaning Process >
The cleaning step is a treatment step of immersing the polyvinyl alcohol film in a cleaning bath, and can remove foreign matter remaining on the surface of the polyvinyl alcohol film or the like. The cleaning bath generally uses a medium containing water as a main component, such as water, distilled water, or pure water. In addition, the cleaning bath may use an iodide such as potassium iodide, and in this case, the concentration of the iodide such as potassium iodide in the cleaning bath is preferably about 1 to 10% by weight, more preferably about 2 to 4% by weight, and still more preferably about 1.6 to 3.8% by weight.
The temperature of the cleaning bath is preferably about 5 to 50 ℃, more preferably about 10 to 40 ℃, and further preferably about 15 to 30 ℃. The time for immersion in the cleaning bath cannot be determined in a short time because the degree of cleaning of the polyvinyl alcohol film is affected by the temperature of the cleaning bath, and is preferably about 1 to 100 seconds, more preferably about 2 to 50 seconds, and still more preferably about 3 to 20 seconds. The swelling step may be performed only 1 time, or may be performed a plurality of times as needed.
< drying step >
The drying step is a step of drying a zinc-containing polyvinyl alcohol film while conveying the film by a plurality of rollers to produce a polarizer having a thickness of 20 μm or less and a moisture content of 13 wt% or more and 19 wt% or less, the plurality of rollers including a first roller provided on the most upstream side in the conveyance direction of the polyvinyl alcohol film, a second roller provided on the most downstream side in the conveyance direction of the polyvinyl alcohol film, and 1 or more third rollers provided between the first roller and the second roller, and among the 1 or more third rollers, an angle of wrap between the polyvinyl alcohol film and at least 1 roller is 90 ° or less.
The plurality of rollers are a plurality of conveying rollers disposed inside a drying section such as a dryer, an oven, or a heating furnace. The first roller is a transport roller provided at the most upstream side in the transport direction of the zinc-containing polyvinyl alcohol film in the drying section, and the zinc-containing polyvinyl alcohol film is first contacted in the drying section. The second roller is a conveying roller which is provided in the drying section at the most downstream side in the conveying direction of the zinc-containing polyvinyl alcohol film and which the zinc-containing polyvinyl alcohol film comes into contact with at the end of the drying section. The third roller is 1 or more conveying rollers provided between the first roller and the second roller in the drying section.
The plurality of rollers are substantially circular rollers, and the size is not particularly limited, but the diameter is preferably about 10 to 1000mm, and more preferably about 30 to 500mm, from the viewpoint of damage to the polarizer due to curvature during conveyance, for example. The plurality of rollers may be the same or different. The plurality of rollers may be heated rollers (heat rollers) or non-heated rollers, and the non-heated rollers are preferable from the viewpoint of reducing the possibility of zinc deposition on the surface of the polarizer when the rollers come into contact with the polarizer.
In the third roll, the wrap angle between the roll of at least 1 roll and the zinc-containing polyvinyl alcohol film is 90 ° or less. Fig. 1 shows a schematic view of the aforementioned wrap angle. The wrap angle is an angle θ (°) formed when the polyvinyl alcohol-based film W containing zinc is conveyed by the roller R. More specifically, the angle formed by the initial point and the final point of contact between the zinc-containing polyvinyl alcohol film W and the roll R is defined by the center point of the roll R as a reference point. From the viewpoint of reducing the contact time between the zinc-containing polyvinyl alcohol film and the roller and suppressing the appearance abnormality (polarization unevenness) of the polarizing plate, the wrap angle is preferably less than 90 °, for example, preferably 80 ° or less, more preferably 70 ° or less, further preferably 60 ° or less, and further preferably 50 ° or less. The lower limit of the wrap angle is not particularly limited from the viewpoint of suppressing appearance abnormality (polarization unevenness) of the polarizer, and may be, for example, 10 ° or more and 30 ° or more from the viewpoint of suppressing scratches of the polarizer due to insufficient rotation of the roller, for example.
The third roll is not generally affected by the temperature and drying time of the drying process, and is preferably provided in the drying section by about 1 to about 30, more preferably about 2 to about 20.
In the drying step, a ratio (contact distance/total transport distance) of a contact distance of the zinc-containing polyvinyl alcohol film with respect to the third roll to a total transport distance of the zinc-containing polyvinyl alcohol film is preferably 0.1 or less. From the viewpoint of reducing the contact time between the zinc-containing polyvinyl alcohol film and the roller and further suppressing the appearance abnormality (uneven polarization) of the polarizer, the contact distance/total transport distance is preferably 0.09 or less. From the viewpoint of improving the transportability of the polyvinyl alcohol film, the contact distance/total transport distance is preferably 0.01 or more, and more preferably 0.03 or more.
In the drying step, the maximum distance (L) between the rollers of the plurality of rollers is set to be longer than the maximum distance (L) between the rollers of the plurality of rollersMAX) And the width (W) of the zinc-containing polyvinyl alcohol film before the drying step1) Ratio of (L)MAX/W1) Preferably 2 or less. The maximum distance between the rollers of the plurality of rollers is: between adjacent rollers (between the upstream roller and the downstream roller), a transport distance (L) from a position where the zinc-containing polyvinyl alcohol film is separated from the upstream roller to a position where the zinc-containing polyvinyl alcohol film is first brought into contact with the downstream roller (L) is a free-running distance1) The longest distance in between. The above-mentioned L is a compound represented by the formula (I) in which L is a group represented by the formula (II)MAX/W1Preferably 1.5 or less, more preferably 1 or less. In addition, the L is for suppressing the occurrence of breakage of the polarizerMAX/W1The lower limit of (b) is not particularly limited, and is, for example, 0.1 to 0.2 from the viewpoint of improving the transportability of the polyvinyl alcohol film.
The drying temperature is not particularly limited as long as the thickness of the obtained polarizer is 20 μm or less and the moisture content is 13 wt% or more and 19 wt% or less, and is, for example, preferably about 15 to 150 ℃, more preferably about 20 to 100 ℃, and still more preferably about 25 to 50 ℃. The drying time cannot be determined in any way because the degree of drying of the polarizer is affected by the drying temperature, and is preferably about 30 to 600 seconds, and more preferably about 60 to 300 seconds. The drying step may be performed only 1 time, or may be performed a plurality of times as needed.
The thickness of the polarizing plate obtained by the production method of the present invention is 20 μm or less, and the moisture content is 13 wt% or more and 19 wt% or less. The thickness of the polarizer is preferably 5 μm or more, more preferably 10 μm or more, in view of the transportability of the polyvinyl alcohol-based film and the polarizer, and is preferably 19 μm or less from the viewpoint of improving the heating durability of the polarizing film. In the polarizer, the moisture content is preferably 13.5% by weight or more, more preferably 14% by weight or more, from the viewpoint of suppressing appearance abnormality (polarization unevenness) due to surface deformation of the polarizer, and the moisture content is preferably 18.5% by weight or less, more preferably 18% by weight or less, from the viewpoint of improving the heating durability of the polarizing film. The moisture content of the polarizer was calculated from the following equation based on the initial weight of a sample (polarizer) cut into a size of 100mm square and the dry weight after drying at 120 ℃ for 2 hours.
Water content (% by weight) { (initial weight-dry weight)/initial weight } × 100
Width (W) of the zinc-containing polyvinyl alcohol film before the drying step of the polarizer1) And the width (W) of the polarizer obtained after the drying step2) Ratio of (W)2/W1) Preferably 0.9 or more and less than 1. The W is used for preventing wrinkles from being generated at the end of the polarizer in the drying step2/W1Preferably 0.92 to 0.98, more preferably 0.94 to 0.98.
< method for producing polarizing film >
The method for manufacturing a polarizing film of the present invention includes: and a step of bonding a transparent protective film to at least one surface of the polarizer via an adhesive layer.
The transparent protective film is not particularly limited, and various transparent protective films conventionally used for polarizing films can be used. As a material constituting the transparent protective film, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, and the like can be used. Examples of the thermoplastic resin include cellulose ester resins such as cellulose triacetate; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyamide resins such as polyethersulfone resins, polysulfone resins, polycarbonate resins, nylons, and aromatic polyamides; polyolefin resins such as polyimide resins, polyethylene, polypropylene, and ethylene-propylene copolymers; (meth) acrylic resins; cyclic polyolefin-based resins (norbornene-based resins), polyarylate-based resins, polystyrene-based resins, polyvinyl alcohol-based resins, and mixtures thereof, which are cyclic ring systems and/or have a norbornene structure. The transparent protective film may be a cured layer made of a thermosetting resin or an ultraviolet curable resin such as a (meth) acrylic, urethane, acrylic urethane, epoxy, or silicone resin. Among these, cellulose ester resins, polycarbonate resins, (meth) acrylic resins, cyclic polyolefin resins, and polyester resins are suitable.
The thickness of the transparent protective film may be suitably determined, and is preferably about 1 to 500 μm, more preferably about 1 to 300 μm, and still more preferably about 5 to 100 μm, from the viewpoint of strength, workability such as handling property, and thin layer property. In addition, from the viewpoint of reducing the moisture permeability of the transparent protective film, the thickness of the transparent protective film is preferably about 10 to 100 μm, more preferably about 20 to 100 μm, and still more preferably about 30 to 100 μm.
The transparent protective film preferably has a moisture permeability of 800 g/(m) from the viewpoint of suppressing a decrease in polarizing performance under a high-temperature or high-temperature and high-humidity environment224h) or less, more preferably 400 g/(m)224h) or less, more preferably 200 g/(m)224h) or less, more preferably 150 g/(m)224h) or less. Further, the transparent protective film on one surface of the polarizer preferably has a moisture permeability of 200 g/(m)224h) or less, more preferably 150 g/(m)224h) or less. The moisture permeability can be calculated as follows: according to the moisture permeability test (cup method) of JIS Z0208, a sample cut to a diameter of 60mm was placed in a moisture permeable cup containing about 15g of calcium chloride, and putThe weight of calcium chloride was measured before and after leaving the mixture at 40 ℃ and 90% humidity r.h. to calculate the weight gain.
When the transparent protective films are attached to both surfaces of the polarizer, the transparent protective films on both surfaces may be the same or different.
The transparent protective film may be a retardation plate having a retardation of 40nm or more in the front direction and/or 80nm or more in the thickness direction. The front phase difference is usually controlled to be in the range of 40 to 200nm, and the thickness direction phase difference is usually controlled to be in the range of 80 to 300 nm. When a retardation plate is used as the transparent protective film, the retardation plate also functions as a transparent protective film, and therefore, the thickness can be reduced.
Examples of the retardation plate include a birefringent film obtained by uniaxially or biaxially stretching a polymer material, an oriented film of a liquid crystal polymer, and an oriented layer of a liquid crystal polymer supported by a film. The thickness of the retardation plate is not particularly limited, but is usually about 20 to 150 μm. The phase plate may be used by bonding the phase plate to a transparent protective film having no retardation.
The transparent protective film may be subjected to a surface modification treatment. Examples of the surface modification treatment include corona treatment, plasma treatment, primer treatment, and saponification treatment.
The surface of the transparent protective film to which the polarizer is not attached may be subjected to a hard coat treatment, an antireflection treatment, a treatment for preventing blocking, diffusion, and/or antiglare purpose. The hard coat treatment, the treatment for the purpose of the antireflection layer, the adhesion-preventing layer, the diffusion layer, and/or the antiglare layer, and the like may be provided separately from the transparent protective film as an optical layer, in addition to the transparent protective film itself.
The transparent protective film may contain any suitable additive such as an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring inhibitor, a flame retardant, an antistatic agent, a pigment, and a colorant.
Examples of the adhesive include an aqueous adhesive, a solvent-based adhesive, an emulsion-based adhesive, a solventless adhesive, an active energy ray-curable adhesive (for example, an ultraviolet ray-curable adhesive and an electron ray-curable adhesive), and a thermosetting adhesive. The adhesive is preferably an aqueous adhesive in view of having a desired curing viscosity or viscosity before curing and excellent adhesiveness to a polarizer.
Any suitable aqueous adhesive can be used as the aqueous adhesive, but an aqueous adhesive containing a PVA resin is suitable. From the viewpoint of adhesiveness, the average polymerization degree of the PVA-based resin is preferably about 100 to 5,500, and more preferably about 1,000 to 4,500. From the viewpoint of adhesiveness, the average saponification degree of the PVA-based resin is preferably about 85 mol% to 100 mol%, and more preferably about 90 mol% to 100 mol%.
The PVA-based resin preferably contains an acetoacetyl group from the viewpoint of excellent adhesion to a polarizer and a protective film and excellent durability. The acetoacetyl group-containing PVA-based resin can be obtained by, for example, reacting a PVA-based resin with diketene by any method. The acetoacetyl group modification degree of the acetoacetyl group-containing PVA-based resin is typically 0.1 mol% or more, preferably about 0.1 mol% to 40 mol%, more preferably about 1 mol% to 20 mol%, and still more preferably about 2 mol% to 7 mol%. The acetoacetyl group modification degree is a value measured by NMR.
The resin (solid content) concentration of the aqueous adhesive is preferably about 0.1 to 15 wt%, more preferably about 0.5 to 10 wt%.
The adhesive may be applied to either the transparent protective film or the polarizer, or to both. After the bonding, a drying step is performed to form an adhesive layer including a coating dry layer. The polarizing material and the transparent protective film may be bonded to each other by a roll laminator or the like. After the drying step, ultraviolet rays and electron beams may be irradiated as necessary. The thickness of the adhesive layer is not particularly limited, but is preferably about 30 to 5000nm, and more preferably about 100 to 1000 nm.
< method for producing laminated polarizing film >
The method for producing a laminated polarizing film (optical laminate) of the present invention includes a step of bonding an optical layer to the polarizing film.
The optical layer is not particularly limited, and for example, 1 or 2 or more layers of optical layers used for forming a liquid crystal display device or the like may be used, such as a reflective plate, a semi-transmissive plate, a retardation plate (including a wavelength plate such as 1/2 or 1/4), a viewing angle compensating film, or the like. Examples of the laminated polarizing film include a reflection-type polarizing film or a semi-transmission-type polarizing film obtained by further laminating a reflection plate or a semi-transmission reflection plate on the polarizing film, an elliptical polarizing film or a circular polarizing film obtained by further laminating a retardation plate on the polarizing film, a wide-angle polarizing film obtained by further laminating a viewing angle compensation film on the polarizing film, and a polarizing film obtained by further laminating a brightness enhancement film on the polarizing film.
An adhesive layer for bonding an image display unit such as a liquid crystal cell or an organic EL element to other members such as a front-surface transparent plate on the visual recognition side or a transparent plate such as a touch panel may be provided on one or both surfaces of the polarizing film or the laminated polarizing film. The adhesive layer is preferably an adhesive layer. The adhesive agent for forming the adhesive layer is not particularly limited, and an adhesive agent containing a polymer such as an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based polymer, or a rubber-based polymer as a base polymer can be appropriately selected and used. In particular, a pressure-sensitive adhesive excellent in optical transparency, exhibiting appropriate wettability and cohesiveness and adhesiveness, and excellent in weather resistance, heat resistance, and the like, such as a pressure-sensitive adhesive containing an acrylic polymer, is preferably used.
The pressure-sensitive adhesive layer may be provided on one or both surfaces of the polarizing film or the laminated polarizing film in an appropriate manner. Examples of the method of providing the pressure-sensitive adhesive layer include a method of preparing a pressure-sensitive adhesive solution and directly providing the solution on the polarizing film or the laminated polarizing film by an appropriate development method such as a casting method or a coating method; or a method of forming an adhesive layer on a separator and transferring the adhesive layer to the polarizing film or the laminated polarizing film. The thickness of the adhesive layer is suitably determined depending on the purpose of use, adhesion and the like, and is usually 1 to 500. mu.m, preferably 5 to 200. mu.m, and more preferably 10 to 100. mu.m.
The exposed surface of the pressure-sensitive adhesive layer is preferably covered by temporarily adhering a separator for the purpose of preventing contamination or the like until the time of application. This can prevent contamination of the pressure-sensitive adhesive layer and the like in a conventional handling state. Examples of the separator include those obtained by coating an appropriate sheet such as a plastic film, a rubber sheet, paper, cloth, nonwoven fabric, net, foamed sheet, metal foil, or a laminate thereof with an appropriate release agent such as silicone-based, long-chain alkyl-based, fluorine-based, or molybdenum sulfide, if necessary.
< method for manufacturing image display Panel and method for manufacturing image display device >
The method for manufacturing an image display panel according to the present invention includes a step of bonding the polarizing film or the laminated polarizing film to an image display unit. The method for manufacturing an image display device according to the present invention includes a step of providing a transparent plate on the polarizing film or laminated polarizing film side (viewing side) of the image display panel.
Examples of the image display unit include a liquid crystal unit and an organic EL unit. As the liquid crystal cell, for example, any of a reflective liquid crystal cell using external light, a transmissive liquid crystal cell using light from a light source such as a backlight, and a transflective liquid crystal cell using both light from the outside and light from the light source can be used. When the liquid crystal cell uses light from the light source, the image display device (liquid crystal display device) is provided with a polarizing film on the side opposite to the visual recognition side of the image display cell (liquid crystal cell), and further with a light source. The polarizing film on the light source side and the liquid crystal cell are preferably bonded via an appropriate adhesive layer. As the driving method of the liquid crystal cell, any type of driving method such as a VA mode, an IPS mode, a TN mode, an STN mode, a bend alignment (pi-type) and the like can be used.
As the organic EL unit, for example, an organic EL unit in which a transparent electrode, an organic light-emitting layer, and a metal electrode are sequentially stacked on a transparent substrate and a light-emitting body (organic electroluminescent light-emitting body) is formed can be suitably used. The organic light-emitting layer is a laminate of various organic thin films, and for example, a laminate comprising a hole injection layer such as a triphenylamine derivative and a light-emitting layer comprising a fluorescent organic solid such as anthracene; a laminate of these light-emitting layers and an electron-injecting layer comprising a perylene derivative or the like; or a laminate of a hole injection layer, a light-emitting layer, and an electron injection layer.
Examples of the transparent plate disposed on the visual recognition side of the image display unit include a front surface transparent plate (window layer), a touch panel, and the like. As the aforementioned front surface transparent plate, a transparent plate having appropriate mechanical strength and thickness can be used. As such a transparent plate, for example, a transparent resin plate such as an acrylic resin or a polycarbonate resin, a glass plate, or the like can be used. As the touch panel, for example, various touch panels of a resistance film type, a capacitance type, an optical type, an ultrasonic type, and the like; a glass plate, a transparent resin plate, or the like having a touch sensor function. When a capacitive touch panel is used as the transparent plate, a front surface transparent plate including glass or a transparent resin plate is preferably provided on the side closer to the visual recognition side than the touch panel.
Examples
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>
< production of polarizing plate >
A polyvinyl alcohol film having an average polymerization degree of 2,400, a saponification degree of 99.9 mol%, a thickness of 45 μm and a width of 2600mm was prepared. The polyvinyl alcohol film is put at the peripheral speedThe rolls having different degrees of hardness were immersed in a swelling bath (water bath) at 28 ℃ for 30 seconds to swell the rolls, stretched 2.4 times in the transport direction (swelling step), and then immersed in a dyeing bath (aqueous solution having an iodine concentration of 0.03 wt% and a potassium iodide concentration of 0.3 wt%) at 25 ℃ for 45 seconds to dye the rolls, while stretched 3.7 times in the transport direction based on the original polyvinyl alcohol film (polyvinyl alcohol film completely unstretched in the transport direction) (dyeing step). Next, the dyed polyvinyl alcohol film was immersed in a crosslinking bath (an aqueous solution having a boric acid concentration of 3.0 wt%, a potassium iodide concentration of 3.0 wt%, and zinc sulfate of 3.6 wt% (zinc ion concentration of 1.5 wt%) at 40 ℃ for 20 seconds, and stretched 4.2 times in the transport direction based on the original polyvinyl alcohol film (crosslinking step). The obtained polyvinyl alcohol film was immersed in a 65 ℃ stretching bath (an aqueous solution having a boric acid concentration of 4.0 wt%, a potassium iodide concentration of 5.0 wt%, and a zinc sulfate concentration of 5.0 wt% (a zinc ion concentration of 2.0 wt%) for 50 seconds, stretched 6.0 times in the transport direction based on the original polyvinyl alcohol film (stretching step), and then immersed in a 27 ℃ cleaning bath (an aqueous solution having a potassium iodide concentration of 2.5 wt%) for 5 seconds (cleaning step). The washed polyvinyl alcohol film was dried at 25 ℃ for 2 minutes in an oven having the roller arrangement shown in FIG. 2 (total number of rollers: 10; maximum wrap angle of the third roller: 43 ℃ C.) to prepare a polarizer. The ratio of the contact distance of the polyvinyl alcohol film with respect to the third roll to the total transport distance of the polyvinyl alcohol film (contact distance/total transport distance) was 0.09. Further, a maximum distance (L) between rollers among the plurality of rollers in the ovenMAX) And the width (W) of the zinc-containing polyvinyl alcohol film before the drying step1) Ratio of (L)MAX/W1) Is 0.21. The thickness of the obtained polarizer was 18 μm, and the moisture content of the polarizer was 17.2 wt%, W2/W1Is 0.97.
< preparation of polarizing film >
As the adhesive, a polyvinyl alcohol resin containing acetoacetyl group (average degree of polymerization of 1,200, degree of saponification of 98.5 mol%, acetoacetyl group) at a weight ratio of 3:1 was usedDegree of acylation of 5 mole%) and methylolmelamine. A transparent protective film (saturated water absorption of 0.2 g/m) having a thickness of 30 μm and made of a (meth) acrylic resin (a modified acrylic polymer having a lactone ring structure) was bonded to one surface (image display unit-side surface) of the polarizer obtained above as a second transparent protective film by using the adhesive by a roll laminator2The moisture permeability is 125 g/(m)224h) (hereinafter, this film is referred to as "transparent film A"), and a cellulose triacetate film having a hard coat layer and a thickness of 40 μm (moisture permeability of 342 g/(m) is laminated on the other surface (viewing side) as a first transparent protective film224 hours), manufactured by KONICA MINOLTA, under the trade name "KC 4 UYW" (hereinafter, this film is referred to as "transparent film B"), and then dried by heating in an oven (at 88 ℃ for 10 minutes) to prepare a polarizing film in which transparent protective films are laminated on both sides of a polarizer.
< production of simulation image display device >
The polarizing film obtained above was cut into a size of 150 × 50cm so that the absorption axis of the polarizer was the long side, a glass plate (analog image display unit) was bonded to one surface of the polarizing film (surface on the transparent film a side) via an acrylic pressure-sensitive adhesive layer having a thickness of 20 μm, and another glass plate was bonded to the other surface of the polarizing film (surface on the transparent film B side) via a pressure-sensitive adhesive (product name "lucicacs 9868" manufactured by ritone electric company) having no acrylic monomer and having a thickness of 200 μm, to produce an analog image display device.
[ evaluation of appearance abnormality (polarization unevenness) ]
The appearance of the polarizing film obtained above was evaluated visually according to the following criteria. The results are shown in Table 1.
Good: appearance is not abnormal or occurs less than 10/m2The polarization of (2) is not uniform.
X: occurs at 10/m2The above polarization unevenness.
[ evaluation of fracture of polarizing plate ]
The appearance of the polarizer obtained above was evaluated visually according to the following criteria. The results are shown in Table 1.
Good: no visually recognizable breaking of the polarizer occurred.
X: a visually recognizable break of the polarizer occurred.
[ evaluation of durability to heating ]
The obtained simulated image display device was left to stand in a hot air oven at a temperature of 95 ℃ for 500 hours, and the appearance after charging (heating) was evaluated visually according to the following criteria. The results are shown in Table 1.
O: the appearance is not abnormal.
X: the polarizer is visually recognizable as unevenness.
< example 2>
< production of polarizer, polarizing film, and analog image display device >
A polarizer was produced in the same manner as in example 1, except that the drying temperature in the drying step was set to 35 ℃. The thickness of the obtained polarizer was 17 μm, the moisture content of the polarizer was 14.3 wt%, and W was2/W1Is 0.95. Using the obtained polarizer, a polarizing film and an analog image display device were produced in the same manner as in example 1.
< example 3>
< production of polarizer, polarizing film, and analog image display device >
A polyvinyl alcohol film having an average polymerization degree of 2,400, a saponification degree of 99.9 mol%, a thickness of 30 μm and a width of 2600mm was prepared. The polyvinyl alcohol film was immersed between rolls having different peripheral speed ratios for 30 seconds at 20 ℃ in a swelling bath (water bath) to swell the film and stretched 2.4 times in the transport direction (swelling step), and then immersed for 45 seconds in a dyeing bath (aqueous solution having an iodine concentration of 0.045 wt% and a potassium iodide concentration of 0.45 wt%) at 25 ℃ to dye the film, while stretching the film 3.7 times in the transport direction based on the original polyvinyl alcohol film (polyvinyl alcohol film completely unstretched in the transport direction) (dyeing step). Next, the dyed polyvinyl alcohol film was subjected to a crosslinking bath (boric acid concentration: 3.0 wt./wt.) at 40 ℃An aqueous solution containing the amount%, potassium iodide concentration of 3.0 wt%, and zinc sulfate of 3.6 wt% (zinc ion concentration of 1.5 wt%) was immersed for 20 seconds, and the film was stretched 4.2 times in the transport direction based on the original polyvinyl alcohol film (crosslinking step). The obtained polyvinyl alcohol film was immersed in a 65 ℃ stretching bath (an aqueous solution having a boric acid concentration of 4.0 wt%, a potassium iodide concentration of 5.0 wt%, and a zinc sulfate concentration of 5.0 wt% (a zinc ion concentration of 2.0 wt%) for 50 seconds, stretched 6.0 times in the transport direction based on the original polyvinyl alcohol film (stretching step), and then immersed in a 20 ℃ cleaning bath (an aqueous solution having a potassium iodide concentration of 3.0 wt%) for 5 seconds (cleaning step). The washed polyvinyl alcohol film was dried at 18 ℃ for 2 minutes in an oven having the roller arrangement shown in FIG. 2 (total number of rollers: 10; maximum wrap angle of the third roller: 43 ℃ C.) to prepare a polarizer. The ratio of the contact distance of the polyvinyl alcohol film with respect to the third roll to the total transport distance of the polyvinyl alcohol film (contact distance/total transport distance) was 0.09. Further, a maximum distance (L) between rollers among the plurality of rollers in the ovenMAX) And the width (W) of the zinc-containing polyvinyl alcohol film before the drying step1) Ratio of (L)MAX/W1) Is 0.20. The thickness of the obtained polarizer was 12 μm, the moisture content of the polarizer was 17.6 wt%, and W was2/W1Is 0.97. Using the obtained polarizer, a polarizing film and an analog image display device were produced in the same manner as in example 1.
< example 4>
< production of polarizer, polarizing film, and analog image display device >
A polarizer was produced in the same manner as in example 3, except that the drying temperature in the drying step was set to 25 ℃. The thickness of the obtained polarizer was 12 μm, and the moisture content of the polarizer was 14.5 wt%, W2/W1Is 0.95. Using the obtained polarizer, a polarizing film and an analog image display device were produced in the same manner as in example 1.
< example 5>
In the manufacture of polarizersA polarizing material was produced in the same manner as in example 1, except that an oven having a roller arrangement as shown in fig. 5 (the total number of rollers was 8; the maximum wrap angle of the third roller was 88 °) was used in the drying step, and the polarizing material was dried at 28 ℃ for 3 minutes. The ratio of the contact distance of the polyvinyl alcohol film with respect to the third roll to the total transport distance of the polyvinyl alcohol film (contact distance/total transport distance) was 0.09. The thickness of the obtained polarizer was 18 μm, the moisture content of the polarizer was 15.0 wt%, and W was2/W1Is 0.92. Further, a maximum distance (L) between rollers among the plurality of rollers in the ovenMAX) And the width (W) of the zinc-containing polyvinyl alcohol film before the drying step1) Ratio of (L)MAX/W1) Is 0.82. Using the obtained polarizer, a polarizing film and an analog image display device were produced in the same manner as in example 1.
< comparative example 1>
< production of polarizer, polarizing film, and analog image display device >
A polarizer was produced in the same manner as in example 1, except that the drying temperature in the drying step was set to 45 ℃. The thickness of the obtained polarizer was 17 μm, the moisture content of the polarizer was 12.5 wt%, and W was2/W1Is 0.91. Using the obtained polarizer, a polarizing film and an analog image display device were produced in the same manner as in example 1.
< comparative example 2>
< production of polarizer, polarizing film, and analog image display device >
A polarizer was produced in the same manner as in example 1, except that the drying temperature in the drying step was set to 17 ℃. The thickness of the obtained polarizer was 18 μm, the moisture content of the polarizer was 19.1 wt%, and W was2/W1Is 0.98. Using the obtained polarizer, a polarizing film and an analog image display device were produced in the same manner as in example 1.
< comparative example 3>
< production of polarizer, polarizing film, and analog image display device >
In the preparation of the polarizer, a polarizer was prepared in the same manner as in example 1, except that an oven having a roller arrangement (the total number of rollers is 18; the maximum wrap angle of the third roller is 176 °) as shown in fig. 3 was used in the drying step, and the polarizer was prepared by drying at 28 ℃ for 5 minutes. Further, a maximum distance (L) between rollers among the plurality of rollers in the ovenMAX) And the width (W) of the zinc-containing polyvinyl alcohol film before the drying step1) Ratio of (L)MAX/W1) Is 0.82. The thickness of the obtained polarizer was 17 μm, the moisture content of the polarizer was 14.3 wt%, and W was2/W1Is 0.84. Using the obtained polarizer, a polarizing film and an analog image display device were produced in the same manner as in example 1. The ratio of the contact distance of the polyvinyl alcohol film with respect to the third roll to the total transport distance of the polyvinyl alcohol film (contact distance/total transport distance) was 0.13.
< comparative example 4>
< production of polarizer, polarizing film, and analog image display device >
In the preparation of the polarizer, a polarizer was prepared in the same manner as in example 1, except that an oven having a roller arrangement (total number of rollers is 6; maximum wrap angle of the third roller is 134 °) as shown in fig. 4 was used in the drying step, and the polarizer was prepared by drying at 31 ℃ for 3 minutes. The thickness of the obtained polarizer was 17 μm, the moisture content of the polarizer was 14.3 wt%, and W was2/W1Is 0.88. Further, a maximum distance (L) between rollers among the plurality of rollers in the ovenMAX) And the width (W) of the zinc-containing polyvinyl alcohol film before the drying step1) Ratio of (L)MAX/W1) Is 0.98. Using the obtained polarizer, a polarizing film and an analog image display device were produced in the same manner as in example 1. The ratio of the contact distance of the polyvinyl alcohol film with respect to the third roll to the total transport distance of the polyvinyl alcohol film (contact distance/total transport distance) was 0.08.
< comparative example 5>
< production of polarizer, polarizing film, and analog image display device >
In the preparation of the polarizer, a polarizer was prepared in the same manner as in example 1, except that the polarizer was dried at 25 ℃ for 2 minutes in an oven without a roller in the drying step. The thickness of the obtained polarizer was 18 μm, and the moisture content of the polarizer was 17.4 wt%, W2/W1Is 0.81. Using the obtained polarizer, a polarizing film and an analog image display device were produced in the same manner as in example 1.
< comparative example 6>
< production of polarizer, polarizing film, and analog image display device >
A polarizer was produced in the same manner as in example 1, except that zinc sulfate was not used in the crosslinking bath and the stretching bath in the production of the polarizer. The thickness of the obtained polarizer was 18 μm, and the moisture content of the polarizer was 17.2 wt%, W2/W1Is 0.96. Using the obtained polarizer, a polarizing film and an analog image display device were produced in the same manner as in example 1.
< comparative example 7>
< production of polarizer, polarizing film, and analog image display device >
A polarizing material was produced in the same manner as in example 1 except that a polyvinyl alcohol film having an average polymerization degree of 2,700, a saponification degree of 99.9 mol%, a thickness of 75 μm and a width of 2600mm was prepared, the concentration of the dyeing bath was adjusted to an iodine concentration of 0.02 wt% and a potassium iodide concentration of 0.2 wt%, and an oven having a roller arrangement as shown in fig. 3 (the total number of rollers was 18; the maximum wrap angle of the third roller was 176 °) was used in the drying step to dry at 45 ℃ for 5 minutes to produce a polarizing material. Further, a maximum distance (L) between rollers among the plurality of rollers in the ovenMAX) And the width (W) of the zinc-containing polyvinyl alcohol film before the drying step1) Ratio of (L)MAX/W1) Is 0.82. The thickness of the obtained polarizer was 28 μm, and the moisture content of the polarizer was 14.5 wt%, W2/W1Is 0.86. Use the instituteA polarizing film and an analog image display device were produced by the same operation as in example 1.
The polarizers and analog image display devices of examples 2 to 5 and comparative examples 1 to 7 obtained as described above were used to perform the evaluations of [ evaluation of appearance abnormality (polarization unevenness) ], [ evaluation of breakage of polarizer ], and [ evaluation of heating durability ]. The results are shown in Table 1.
[ Table 1]
Description of the reference numerals
Zinc-containing polyvinyl alcohol film
R roller
Angle of theta wrap angle
L1Distance of flight
Claims (10)
1. A method for producing a polarizing element, characterized in that a polyvinyl alcohol film is subjected to at least a dyeing step, a crosslinking step, and a stretching step, and then to a drying step,
the treatment bath in at least one of the dyeing step, the crosslinking step and the stretching step contains zinc ions,
the drying step is a step of drying a polyvinyl alcohol film containing zinc while conveying the film by a plurality of rollers to produce a polarizing plate having a thickness of 20 μm or less and a moisture content of 13 to 19 wt%,
the plurality of rollers includes:
a first roller disposed on the most upstream side in the transport direction of the polyvinyl alcohol film,
A second roller disposed on the most downstream side in the transport direction of the polyvinyl alcohol film, and
1 or more third rollers provided between the first roller and the second roller,
at least 1 of the 1 or more third rolls has an angle of wrap with the polyvinyl alcohol film of 90 ° or less.
2. The method of producing a polarizing plate according to claim 1, wherein in the drying step, a contact distance/total transport distance that is a ratio of a contact distance of the zinc-containing polyvinyl alcohol film with respect to the third roller to a total transport distance of the zinc-containing polyvinyl alcohol film is 0.1 or less.
3. The method of claim 1 or 2, wherein a maximum distance L between the rollers of the plurality of rollersMAXAnd the width W of the zinc-containing polyvinyl alcohol film before the drying step1Ratio L ofMAX/W1Is 2 or less.
4. The method of producing the polarizing plate according to any one of claims 1 to 3, wherein the width W of the zinc-containing polyvinyl alcohol film before the step of drying the polarizing plate1And the width W of the polarizing material obtained after the drying process2Ratio W of2/W1Is 0.9 or more and less than 1.
5. A method for manufacturing a polarizing film, comprising the steps of: a step of bonding a transparent protective film to at least one surface of the polarizing plate obtained by the method for producing a polarizing plate according to any one of claims 1 to 4 via an adhesive layer.
6. A method for manufacturing a polarizing film according to claim 5, wherein the adhesive forming the adhesive layer is an aqueous adhesive.
7. A method for manufacturing a polarizing film according to claim 5 or 6, wherein the transparent protective film has a moisture permeability of 200 g/(m)224h) or less.
8. A method for manufacturing a laminated polarizing film, comprising the steps of: a step of bonding an optical layer to the polarizing film obtained by the method for producing a polarizing film according to any one of claims 5 to 7.
9. A method for manufacturing an image display panel, comprising the steps of: a step of bonding a polarizing film obtained by the method for producing a polarizing film according to any one of claims 5 to 7 or a laminated polarizing film obtained by the method for producing a laminated polarizing film according to claim 8 to an image display unit.
10. A method for manufacturing an image display device, comprising the steps of: a step of providing a transparent plate on the polarizing film or laminated polarizing film side of the image display panel obtained by the method for manufacturing an image display panel according to claim 9.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019032945 | 2019-02-26 | ||
| JP2019-032945 | 2019-02-26 | ||
| PCT/JP2020/007068 WO2020175372A1 (en) | 2019-02-26 | 2020-02-21 | Manufacturing method for polarizer, manufacturing method for polarizing film, manufacturing method for laminated polarizing film, manufacturing method for image display panel, and manufacturing method for image display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112041715A true CN112041715A (en) | 2020-12-04 |
Family
ID=72239568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080002447.6A Pending CN112041715A (en) | 2019-02-26 | 2020-02-21 | Method for manufacturing polarizer, method for manufacturing polarizing film, method for manufacturing laminated polarizing film, method for manufacturing image display panel, and method for manufacturing image display device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6772402B1 (en) |
| KR (1) | KR20210130626A (en) |
| CN (1) | CN112041715A (en) |
| WO (1) | WO2020175372A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2023027631A (en) * | 2021-08-17 | 2023-03-02 | 住友化学株式会社 | Polarizing plate |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002333520A (en) * | 2001-05-07 | 2002-11-22 | Nitto Denko Corp | Method for manufacturing aligned film, polarizing film, polarizing plate and liquid crystal display device |
| JP2008055890A (en) * | 2006-06-06 | 2008-03-13 | Fujifilm Corp | Thermoplastic resin film, its production method, polarizing plate, optical compensation film, antireflection film, and liquid crystal display device |
| US20090147359A1 (en) * | 2004-03-31 | 2009-06-11 | Nitto Denko Corporation | Method for manufacturing polarizing film, polarizing film obtained by the method, and image display apparatus using the polarizing film |
| KR20110073896A (en) * | 2009-12-24 | 2011-06-30 | 동우 화인켐 주식회사 | Method for preparing polarizer |
| JP2012014001A (en) * | 2010-07-01 | 2012-01-19 | Nitto Denko Corp | Method for manufacturing polarizer, polarizer, polarizing plate, optical film and image display device |
| CN102681074A (en) * | 2011-02-22 | 2012-09-19 | 日东电工株式会社 | Method of manufacturing polarizer |
| CN104076427A (en) * | 2013-03-29 | 2014-10-01 | 日东电工株式会社 | Method for manufacturing polarizing plate, polarizing plate, optical film and image display device |
| CN104136948A (en) * | 2012-02-28 | 2014-11-05 | 住友化学株式会社 | Method for producing polarizing plate |
| CN206584067U (en) * | 2017-02-23 | 2017-10-24 | 住友化学株式会社 | The manufacture device of polarizing coating |
| WO2017204271A1 (en) * | 2016-05-27 | 2017-11-30 | 日本合成化学工業株式会社 | Polyvinyl alcohol-based film, production method therefor, and polarization film using polyvinyl alcohol-based film |
| CN107735703A (en) * | 2015-07-02 | 2018-02-23 | 住友化学株式会社 | The manufacture method of polarizing coating |
| CN108369308A (en) * | 2015-12-18 | 2018-08-03 | 住友化学株式会社 | The manufacturing device and manufacturing method and polarizing coating of polarizing coating |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4043263B2 (en) | 2002-03-18 | 2008-02-06 | 日東電工株式会社 | Manufacturing method of polarizer, polarizer, polarizing plate, and image display device |
| JP2004061565A (en) | 2002-07-24 | 2004-02-26 | Nitto Denko Corp | Polarizer, polarizing plate, optical member and display device using the same |
| JP2005307055A (en) * | 2004-04-22 | 2005-11-04 | Fuji Photo Film Co Ltd | Method for producing cellulose acylate, cellulose acylate film, and optically functional sheet, polarizing plate and liquid crystal display device, using the same |
| JP2006047978A (en) | 2004-06-29 | 2006-02-16 | Nitto Denko Corp | Polarizer, its manufacturing method, polarizing plate, optical film and image display apparatus |
| JP2006317747A (en) | 2005-05-13 | 2006-11-24 | Nitto Denko Corp | Polarizing plate, its manufacturing method, optical film and image display device |
| JP2009042457A (en) | 2007-08-08 | 2009-02-26 | Nitto Denko Corp | Polarizing plate, method for producing the same, optical film, and image display apparatus |
| JP4686512B2 (en) | 2007-08-08 | 2011-05-25 | 日東電工株式会社 | Polarizing plate, manufacturing method thereof, optical film, and image display device |
| JP5073589B2 (en) * | 2007-12-13 | 2012-11-14 | 日東電工株式会社 | Manufacturing method of polarizer, polarizer, polarizing plate, optical film, and image display device |
| JP2012047799A (en) | 2010-08-24 | 2012-03-08 | Nitto Denko Corp | Manufacturing method of polarizer |
| WO2015146890A1 (en) * | 2014-03-24 | 2015-10-01 | コニカミノルタ株式会社 | Optical film, method for producing same, polarizing plate and liquid crystal display device |
-
2020
- 2020-02-21 KR KR1020207024284A patent/KR20210130626A/en active Search and Examination
- 2020-02-21 WO PCT/JP2020/007068 patent/WO2020175372A1/en active Application Filing
- 2020-02-21 CN CN202080002447.6A patent/CN112041715A/en active Pending
- 2020-02-21 JP JP2020536897A patent/JP6772402B1/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002333520A (en) * | 2001-05-07 | 2002-11-22 | Nitto Denko Corp | Method for manufacturing aligned film, polarizing film, polarizing plate and liquid crystal display device |
| US20090147359A1 (en) * | 2004-03-31 | 2009-06-11 | Nitto Denko Corporation | Method for manufacturing polarizing film, polarizing film obtained by the method, and image display apparatus using the polarizing film |
| JP2008055890A (en) * | 2006-06-06 | 2008-03-13 | Fujifilm Corp | Thermoplastic resin film, its production method, polarizing plate, optical compensation film, antireflection film, and liquid crystal display device |
| KR20110073896A (en) * | 2009-12-24 | 2011-06-30 | 동우 화인켐 주식회사 | Method for preparing polarizer |
| JP2012014001A (en) * | 2010-07-01 | 2012-01-19 | Nitto Denko Corp | Method for manufacturing polarizer, polarizer, polarizing plate, optical film and image display device |
| CN102681074A (en) * | 2011-02-22 | 2012-09-19 | 日东电工株式会社 | Method of manufacturing polarizer |
| CN104136948A (en) * | 2012-02-28 | 2014-11-05 | 住友化学株式会社 | Method for producing polarizing plate |
| CN104076427A (en) * | 2013-03-29 | 2014-10-01 | 日东电工株式会社 | Method for manufacturing polarizing plate, polarizing plate, optical film and image display device |
| CN107735703A (en) * | 2015-07-02 | 2018-02-23 | 住友化学株式会社 | The manufacture method of polarizing coating |
| CN108369308A (en) * | 2015-12-18 | 2018-08-03 | 住友化学株式会社 | The manufacturing device and manufacturing method and polarizing coating of polarizing coating |
| WO2017204271A1 (en) * | 2016-05-27 | 2017-11-30 | 日本合成化学工業株式会社 | Polyvinyl alcohol-based film, production method therefor, and polarization film using polyvinyl alcohol-based film |
| CN206584067U (en) * | 2017-02-23 | 2017-10-24 | 住友化学株式会社 | The manufacture device of polarizing coating |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020175372A1 (en) | 2020-09-03 |
| KR20210130626A (en) | 2021-11-01 |
| JPWO2020175372A1 (en) | 2021-03-11 |
| JP6772402B1 (en) | 2020-10-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6985555B2 (en) | Polarizers, polarizing films, laminated polarizing films, image display panels, and image display devices | |
| CN111801607B (en) | Polarizing film, laminated polarizing film, image display panel, image display device, and method for producing polarizing film | |
| JP7219799B2 (en) | Polarizing film, polarizing film, laminated polarizing film, image display panel, and image display device | |
| JP7212122B2 (en) | Polarizing film, polarizing film, laminated polarizing film, image display panel, and image display device | |
| JP7212123B2 (en) | Polarizing film, polarizing film, laminated polarizing film, image display panel, and image display device | |
| TW202108390A (en) | Polarizing plate, method for manufacturing polarizing plate, and image display device using the polarizing plate | |
| CN111837061A (en) | Polarizing film, laminated polarizing film, image display panel, and image display device | |
| CN114096900A (en) | Polarizing film, laminated polarizing film, image display panel, and image display device | |
| CN112041715A (en) | Method for manufacturing polarizer, method for manufacturing polarizing film, method for manufacturing laminated polarizing film, method for manufacturing image display panel, and method for manufacturing image display device | |
| CN108780180B (en) | Method for producing single-side protective polarizing film with transparent resin layer, method for producing polarizing film with adhesive layer, and method for producing image display device | |
| CN114080551A (en) | Polarizing film, laminated polarizing film, image display panel, and image display device | |
| CN115427851A (en) | Polarizing film, laminated polarizing film, image display panel, and image display device | |
| WO2021215385A1 (en) | Polarizing film, laminated polarizing film, image display panel, and image display device | |
| CN115176181A (en) | Polarizing film, laminated polarizing film, image display panel, and image display device | |
| TW202144820A (en) | Image display panel and image display device | |
| WO2022186029A1 (en) | Polarizing membrane, polarizing film, image display panel, and image display device | |
| CN114096901A (en) | Polarizing film, laminated polarizing film, image display panel, and image display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |