CN113366353A - Polyester film and polarizing plate comprising same - Google Patents
Polyester film and polarizing plate comprising same Download PDFInfo
- Publication number
- CN113366353A CN113366353A CN201980090908.7A CN201980090908A CN113366353A CN 113366353 A CN113366353 A CN 113366353A CN 201980090908 A CN201980090908 A CN 201980090908A CN 113366353 A CN113366353 A CN 113366353A
- Authority
- CN
- China
- Prior art keywords
- polyester film
- film
- polarizing plate
- polarizer
- stretching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 229920006267 polyester film Polymers 0.000 title claims abstract description 133
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000006872 improvement Effects 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 71
- 238000004519 manufacturing process Methods 0.000 description 56
- 229920005989 resin Polymers 0.000 description 33
- 239000011347 resin Substances 0.000 description 33
- 239000010410 layer Substances 0.000 description 31
- 239000004372 Polyvinyl alcohol Substances 0.000 description 25
- 229920002451 polyvinyl alcohol Polymers 0.000 description 25
- -1 polyethylene terephthalate Polymers 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 22
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 21
- 229920001225 polyester resin Polymers 0.000 description 17
- 239000004645 polyester resin Substances 0.000 description 17
- 238000011156 evaluation Methods 0.000 description 16
- 239000000463 material Substances 0.000 description 16
- 229920000139 polyethylene terephthalate Polymers 0.000 description 16
- 239000005020 polyethylene terephthalate Substances 0.000 description 16
- 230000001681 protective effect Effects 0.000 description 13
- 239000000243 solution Substances 0.000 description 13
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 12
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 12
- 238000004043 dyeing Methods 0.000 description 10
- 239000004973 liquid crystal related substance Substances 0.000 description 10
- 239000000758 substrate Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000008859 change Effects 0.000 description 9
- 239000010419 fine particle Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 9
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 8
- 239000004327 boric acid Substances 0.000 description 8
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 7
- 239000012790 adhesive layer Substances 0.000 description 7
- 229910052740 iodine Inorganic materials 0.000 description 7
- 239000011630 iodine Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 6
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 229920005862 polyol Polymers 0.000 description 6
- 150000003077 polyols Chemical class 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 4
- YPFDHNVEDLHUCE-UHFFFAOYSA-N 1,3-propanediol Substances OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 4
- 229940035437 1,3-propanediol Drugs 0.000 description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000012046 mixed solvent Substances 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 229920000166 polytrimethylene carbonate Polymers 0.000 description 4
- DNIAPMSPPWPWGF-VKHMYHEASA-N (+)-propylene glycol Chemical compound C[C@H](O)CO DNIAPMSPPWPWGF-VKHMYHEASA-N 0.000 description 3
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 3
- 229920000178 Acrylic resin 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
- 230000000996 additive effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 210000002858 crystal cell Anatomy 0.000 description 3
- 238000000113 differential scanning calorimetry Methods 0.000 description 3
- 238000005401 electroluminescence Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920002284 Cellulose triacetate Polymers 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 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 2
- 230000001070 adhesive effect Effects 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 2
- 238000003851 corona treatment Methods 0.000 description 2
- 150000001925 cycloalkenes Chemical class 0.000 description 2
- LNGJOYPCXLOTKL-UHFFFAOYSA-N cyclopentane-1,3-dicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)C1 LNGJOYPCXLOTKL-UHFFFAOYSA-N 0.000 description 2
- WOZVHXUHUFLZGK-UHFFFAOYSA-N dimethyl terephthalate Chemical compound COC(=O)C1=CC=C(C(=O)OC)C=C1 WOZVHXUHUFLZGK-UHFFFAOYSA-N 0.000 description 2
- 150000002009 diols Chemical class 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 238000007127 saponification reaction Methods 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- PXGZQGDTEZPERC-UHFFFAOYSA-N 1,4-cyclohexanedicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)CC1 PXGZQGDTEZPERC-UHFFFAOYSA-N 0.000 description 1
- 229940043375 1,5-pentanediol Drugs 0.000 description 1
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- GBURUDXSBYGPBL-UHFFFAOYSA-N 2,2,3-trimethylhexanedioic acid Chemical compound OC(=O)C(C)(C)C(C)CCC(O)=O GBURUDXSBYGPBL-UHFFFAOYSA-N 0.000 description 1
- FQXGHZNSUOHCLO-UHFFFAOYSA-N 2,2,4,4-tetramethyl-1,3-cyclobutanediol Chemical compound CC1(C)C(O)C(C)(C)C1O FQXGHZNSUOHCLO-UHFFFAOYSA-N 0.000 description 1
- GZZLQUBMUXEOBE-UHFFFAOYSA-N 2,2,4-trimethylhexane-1,6-diol Chemical compound OCCC(C)CC(C)(C)CO GZZLQUBMUXEOBE-UHFFFAOYSA-N 0.000 description 1
- PKKDWPSOOQBWFB-UHFFFAOYSA-N 2,4-dichloro-6-[(3,5-dichloro-2-hydroxyphenyl)methyl]phenol Chemical compound OC1=C(Cl)C=C(Cl)C=C1CC1=CC(Cl)=CC(Cl)=C1O PKKDWPSOOQBWFB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- IMSODMZESSGVBE-UHFFFAOYSA-N 2-Oxazoline Chemical compound C1CN=CO1 IMSODMZESSGVBE-UHFFFAOYSA-N 0.000 description 1
- JAEJSNFTJMYIEF-UHFFFAOYSA-N 2-benzylpropanedioic acid Chemical compound OC(=O)C(C(O)=O)CC1=CC=CC=C1 JAEJSNFTJMYIEF-UHFFFAOYSA-N 0.000 description 1
- DSKYSDCYIODJPC-UHFFFAOYSA-N 2-butyl-2-ethylpropane-1,3-diol Chemical compound CCCCC(CC)(CO)CO DSKYSDCYIODJPC-UHFFFAOYSA-N 0.000 description 1
- BUYHVRZQBLVJOO-UHFFFAOYSA-N 2-ethyl-2,4-dimethylhexane-1,3-diol Chemical compound CCC(C)C(O)C(C)(CC)CO BUYHVRZQBLVJOO-UHFFFAOYSA-N 0.000 description 1
- QNKRHLZUPSSIPN-UHFFFAOYSA-N 2-ethyl-2-(2-methylpropyl)propane-1,3-diol Chemical compound CCC(CO)(CO)CC(C)C QNKRHLZUPSSIPN-UHFFFAOYSA-N 0.000 description 1
- ODJQKYXPKWQWNK-UHFFFAOYSA-N 3,3'-Thiobispropanoic acid Chemical compound OC(=O)CCSCCC(O)=O ODJQKYXPKWQWNK-UHFFFAOYSA-N 0.000 description 1
- SXFJDZNJHVPHPH-UHFFFAOYSA-N 3-methylpentane-1,5-diol Chemical compound OCCC(C)CCO SXFJDZNJHVPHPH-UHFFFAOYSA-N 0.000 description 1
- HSSYVKMJJLDTKZ-UHFFFAOYSA-N 3-phenylphthalic acid Chemical compound OC(=O)C1=CC=CC(C=2C=CC=CC=2)=C1C(O)=O HSSYVKMJJLDTKZ-UHFFFAOYSA-N 0.000 description 1
- VWGKEVWFBOUAND-UHFFFAOYSA-N 4,4'-thiodiphenol Chemical compound C1=CC(O)=CC=C1SC1=CC=C(O)C=C1 VWGKEVWFBOUAND-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- DBPRUZCKPFOVDV-UHFFFAOYSA-N Clorprenaline hydrochloride Chemical compound O.Cl.CC(C)NCC(O)C1=CC=CC=C1Cl DBPRUZCKPFOVDV-UHFFFAOYSA-N 0.000 description 1
- QEVGZEDELICMKH-UHFFFAOYSA-N Diglycolic acid Chemical compound OC(=O)COCC(O)=O QEVGZEDELICMKH-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- ALQSHHUCVQOPAS-UHFFFAOYSA-N Pentane-1,5-diol Chemical compound OCCCCCO ALQSHHUCVQOPAS-UHFFFAOYSA-N 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- 206010042674 Swelling Diseases 0.000 description 1
- 239000003490 Thiodipropionic acid Substances 0.000 description 1
- XDODWINGEHBYRT-UHFFFAOYSA-N [2-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCCCC1CO XDODWINGEHBYRT-UHFFFAOYSA-N 0.000 description 1
- LUSFFPXRDZKBMF-UHFFFAOYSA-N [3-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCCC(CO)C1 LUSFFPXRDZKBMF-UHFFFAOYSA-N 0.000 description 1
- YIMQCDZDWXUDCA-UHFFFAOYSA-N [4-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCC(CO)CC1 YIMQCDZDWXUDCA-UHFFFAOYSA-N 0.000 description 1
- BWVAOONFBYYRHY-UHFFFAOYSA-N [4-(hydroxymethyl)phenyl]methanol Chemical compound OCC1=CC=C(CO)C=C1 BWVAOONFBYYRHY-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
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- 150000008065 acid anhydrides Chemical class 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- LBVBDLCCWCJXFA-UHFFFAOYSA-N adamantane-1,2-dicarboxylic acid Chemical compound C1C(C2)CC3CC1C(C(=O)O)C2(C(O)=O)C3 LBVBDLCCWCJXFA-UHFFFAOYSA-N 0.000 description 1
- RVIZJROSQMQZCG-UHFFFAOYSA-N adamantane-1,2-diol Chemical compound C1C(C2)CC3CC1C(O)C2(O)C3 RVIZJROSQMQZCG-UHFFFAOYSA-N 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- HDLHSQWNJQGDLM-UHFFFAOYSA-N bicyclo[2.2.1]heptane-2,5-dicarboxylic acid Chemical compound C1C2C(C(=O)O)CC1C(C(O)=O)C2 HDLHSQWNJQGDLM-UHFFFAOYSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
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- 235000019437 butane-1,3-diol Nutrition 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
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- QSAWQNUELGIYBC-UHFFFAOYSA-N cyclohexane-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCCCC1C(O)=O QSAWQNUELGIYBC-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- VNGOYPQMJFJDLV-UHFFFAOYSA-N dimethyl benzene-1,3-dicarboxylate Chemical compound COC(=O)C1=CC=CC(C(=O)OC)=C1 VNGOYPQMJFJDLV-UHFFFAOYSA-N 0.000 description 1
- LNGAGQAGYITKCW-UHFFFAOYSA-N dimethyl cyclohexane-1,4-dicarboxylate Chemical compound COC(=O)C1CCC(C(=O)OC)CC1 LNGAGQAGYITKCW-UHFFFAOYSA-N 0.000 description 1
- GYUVMLBYMPKZAZ-UHFFFAOYSA-N dimethyl naphthalene-2,6-dicarboxylate Chemical compound C1=C(C(=O)OC)C=CC2=CC(C(=O)OC)=CC=C21 GYUVMLBYMPKZAZ-UHFFFAOYSA-N 0.000 description 1
- OREAFAJWWJHCOT-UHFFFAOYSA-N dimethylmalonic acid Chemical compound OC(=O)C(C)(C)C(O)=O OREAFAJWWJHCOT-UHFFFAOYSA-N 0.000 description 1
- HPGJOUYGWKFYQW-UHFFFAOYSA-N diphenyl benzene-1,4-dicarboxylate Chemical compound C=1C=C(C(=O)OC=2C=CC=CC=2)C=CC=1C(=O)OC1=CC=CC=C1 HPGJOUYGWKFYQW-UHFFFAOYSA-N 0.000 description 1
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 229920001477 hydrophilic polymer Polymers 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- ABMFBCRYHDZLRD-UHFFFAOYSA-N naphthalene-1,4-dicarboxylic acid Chemical compound C1=CC=C2C(C(=O)O)=CC=C(C(O)=O)C2=C1 ABMFBCRYHDZLRD-UHFFFAOYSA-N 0.000 description 1
- VAWFFNJAPKXVPH-UHFFFAOYSA-N naphthalene-1,6-dicarboxylic acid Chemical compound OC(=O)C1=CC=CC2=CC(C(=O)O)=CC=C21 VAWFFNJAPKXVPH-UHFFFAOYSA-N 0.000 description 1
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- 239000010409 thin film Substances 0.000 description 1
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- 238000001721 transfer moulding Methods 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
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Images
Classifications
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/025—Electric or magnetic properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/123—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/127—Acids containing aromatic rings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
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- C08G63/183—Terephthalic acids
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Abstract
Provided is a polyester film which is reduced in the occurrence of rainbow unevenness when applied to an image display device and contributes to the improvement of the durability of a polarizing plate. The polyester film of the present invention has a linear expansion coefficient of 3.5X 10 in the 1 st direction‑5/℃The linear expansion coefficient in the 2 nd direction orthogonal to the 1 st direction is 3.5 × 10‑5The polyester film has a slow axis in a direction of-5 DEG to 5 DEG relative to the 1 st direction.
Description
Technical Field
The present invention relates to a polyester film and a polarizing plate comprising the same.
Background
In image display devices (for example, liquid crystal display devices and organic EL display devices), a polarizing plate is often disposed on at least one side of a display cell due to the image forming system. In recent years, the functions and applications of image display devices tend to be further diversified, and it is required that the image display devices can be used under more severe environments. A polarizing plate generally has a structure in which a polarizer is sandwiched between 2 protective films, and cellulose triacetate, acrylic resin, cycloolefin resin, and the like are widely used as the protective film. On the other hand, from the viewpoint of the durability as described above, it has been proposed to use a polyester film excellent in mechanical properties, chemical resistance, and moisture barrier properties, such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), as a polarizer protective film (for example, patent document 1). However, although polyester films have excellent mechanical properties, they have birefringence, which may cause deterioration in visual recognizability such as occurrence of rainbow unevenness. In particular, with the recent increase in brightness and color purity of image display devices, the problem of such iridescence is remarkable.
On the other hand, in a polarizing plate using a protective film formed of cellulose triacetate, acrylic resin, or cycloolefin resin, which has been conventionally used, cracks may occur in the polarizer due to a temperature change. In recent years, as image display devices have been made thinner, there has been a demand for thinner polarizers, and since it is assumed that image display devices used at high temperatures are increasing, there has been a strong demand for polarizers having excellent durability without causing cracks in polarizers.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 8-271733
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the above-mentioned conventional problems, and a main object thereof is to provide a polyester film which is less likely to cause rainbow unevenness when applied to an image display device and which contributes to improvement of durability of a polarizing plate.
Means for solving the problems
The polyester film of the present invention has a linear expansion coefficient of 3.5X 10 in the 1 st direction-5A linear expansion coefficient of 3.5X 10 in a 2 nd direction perpendicular to the 1 st direction at a temperature of not more than DEG C-5The polyester film has a slow axis in a direction of-5 DEG to 5 DEG relative to the 1 st direction.
In 1 embodiment, the polyester film has a crystallinity of 30% or more as measured by DSC.
According to another aspect of the present invention, there is provided a polarizing plate. The polarizing plate includes: a polarizing member, and the polyester film according to claim 1 or 2 disposed on one side of the polarizing member.
In 1 embodiment, the polarizer has a thickness of 20 μm or less.
In 1 embodiment, the polarizing plate further includes an easy-adhesion layer disposed on the polarizer side of the polyester film.
In 1 embodiment, the easy adhesion layer contains fine particles.
In 1 embodiment, the easy adhesion layer has a thickness of 0.35 μm or less.
In 1 embodiment, the easy adhesion layer has a refractive index of 1.55 or less.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, by selectively reducing the linear expansion coefficient in a predetermined direction, it is possible to provide a polyester film which is less likely to generate rainbow unevenness when combined with a polarizing plate and which contributes to improvement of the durability of the polarizing plate.
Drawings
Fig. 1 is a schematic cross-sectional view of a polarizing plate according to 1 embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a polarizing plate according to another embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.
A. Polyester film
The polyester film of the present invention has a linear expansion coefficient of 3.5X 10 in the 1 st direction-5A linear expansion coefficient of 3.5X 10 in a 2 nd direction perpendicular to the 1 st direction and at most/° C-5Below/° c. When a polyester film having such a linear expansion coefficient is used, the polyester film can be laminated on a polarizer to effectively protect the polarizer and prevent the polarizer from cracking. More specifically, when the polyester film of the present invention is laminated on a polarizer as a polarizer protective film to form a polarizing plate, dimensional changes (for example, dimensional changes due to heat) of the polarizer can be further suppressed by the polyester film. As a result, when the polyester film of the present invention is used, the occurrence of cracks in the polarizer can be prevented even under severe environments such as high temperature and large temperature change, and a polarizing plate having excellent durability can be obtained. In 1 embodiment, the 1 st direction corresponds to the conveyance direction (MD) in the production of a polyester film. The 2 nd direction may correspond to TD orthogonal to MD. The linear expansion coefficient can be determined by TMA measurement according to JIS K7197. The expression "substantially parallel" includes the case where the angle formed by the 2 directions is 0 ° ± 10 °, preferably 0 ° ± 7 °, and more preferably 0 ° ± 5 °.
The polyester film of the present invention has a slow axis in the direction of-5 to 5 DEG with respect to the 1 st direction. When the amount is within this range, a polyester film with less occurrence of rainbow unevenness when combined with a polarizer can be obtained. More specifically, as described above, when the polarizing plate is configured by laminating a polarizer and a polyester film so that the absorption axis of the polarizer is substantially parallel to the 1 st direction, iridescence can be effectively prevented.
The angle formed by the 1 st direction and the slow axis is preferably-3 ° to 3 °, more preferably-1 ° to 1 °, particularly preferably-0.5 ° to 0.5 °, and most preferably 0 °. Within such a range, the above effect is more remarkable.
The polyester film preferably has a linear expansion coefficient of 3.0X 10 in the 1 st direction-5Lower than/° C, more preferably 2.5X 10-5Less than/° C, more preferably 1.5X 10-5Lower than/° C, particularly preferably 1.3X 10-5Below/° c. Within such a range, the above effect is more remarkable. The lower the linear expansion coefficient of the polyester film in the 1 st direction is, the lower limit thereof is, for example, 0.3X 10-5/° C (preferably 0.1X 10)-5/° C, more preferably 0X 10-5/℃)。
The polyester film preferably has a linear expansion coefficient of 3.4X 10 in the 2 nd direction-5Lower than/° C, more preferably 2.3X 10-5Below/° c. Within such a range, the above effect is more remarkable. The lower the linear expansion coefficient of the polyester film in the 1 st direction is, the lower limit thereof is, for example, 1X 10-5/° C (preferably 0.5X 10)-5/. degree.C., more preferably 0.3X 10-5/℃)。
Typically, the polyester film may be a stretched film obtained through a stretching step. By appropriately adjusting the production conditions in the stretching step, the linear expansion coefficients in the 1 st direction and the 2 nd direction (and the in-plane retardation Re (590) described later) can be controlled well, and as a result, a polyester film having excellent properties for the polarizer protective film from the viewpoints of iridescence and durability as described above can be obtained. The production conditions include stretching conditions (stretching temperature, stretching ratio, stretching speed, MD/TD stretching order), preheating temperature before stretching, heat treatment temperature after stretching, heat treatment time after stretching, relaxation rate in MD/TD direction after stretching, and the like. The stretching temperature, stretching ratio and stretching speed can be appropriately adjusted for each MD/TD.
The in-plane retardation Re (590) of the polyester film is, for example, greater than 0nm and not more than 10000 nm. The in-plane retardation Re (λ) is an in-plane retardation of the film measured at 23 ℃ with light of wavelength λ nm. Accordingly, Re (590) is the in-plane retardation of the film measured with light having a wavelength of 590 nm. For Re (λ), when the thickness of the film is d (nm), by the formula: re (λ) ═ (nx-ny) × d. Here, nx is a refractive index in a direction in which the in-plane refractive index is maximum (i.e., the slow axis direction), and ny is a refractive index in a direction orthogonal to the slow axis in the plane.
The crystallinity of the polyester film as measured by Differential Scanning Calorimetry (DSC) is preferably 30% or more, more preferably 40% or more, and still more preferably 50% or more. The upper limit of the crystallinity is, for example, 70%. Within such a range, a polyester film having excellent heat resistance and mechanical properties and suitable as a polarizer protective film can be obtained.
The thickness of the polyester film is typically 10 to 100. mu.m, preferably 20 to 80 μm, and more preferably 20 to 50 μm.
The total light transmittance of the polyester film is preferably 80% or more, more preferably 85% or more, further preferably 90% or more, and particularly preferably 95% or more. The haze of the polyester film is preferably 1.0% or less, more preferably 0.7% or less, further preferably 0.5% or less, and particularly preferably 0.3% or less.
The moisture permeability of the polyester film is preferably 100g/m224hr or less, more preferably 50g/m224hr or less, more preferably 15g/m224hr or less. Within such a range, a polarizing plate having excellent durability and moisture resistance can be obtained.
The polyester film of the present invention is formed of a polyester resin. The polyester resin can be obtained by condensation polymerization of a carboxylic acid component and a polyol component.
Examples of the carboxylic acid component include aromatic dicarboxylic acids, aliphatic dicarboxylic acids, and alicyclic dicarboxylic acids. Examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, benzylmalonic acid, 1, 4-naphthalenedicarboxylic acid, biphenyldicarboxylic acid, 4' -oxybenzoic acid, and 2, 5-naphthalenedicarboxylic acid. Examples of the aliphatic dicarboxylic acid include malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, trimethyladipic acid, pimelic acid, 2-dimethylglutaric acid, azelaic acid, sebacic acid, fumaric acid, maleic acid, itaconic acid, thiodipropionic acid, and diglycolic acid. Examples of the alicyclic dicarboxylic acid include 1, 3-cyclopentanedicarboxylic acid, 1, 2-cyclohexanedicarboxylic acid, 1, 3-cyclopentanedicarboxylic acid, 1, 4-cyclohexanedicarboxylic acid, 2, 5-norbornanedicarboxylic acid, and adamantanedicarboxylic acid. The carboxylic acid component may be a derivative such as an ester, a chloride or an acid anhydride, and includes, for example, dimethyl 1, 4-cyclohexanedicarboxylate, dimethyl 2, 6-naphthalenedicarboxylate, dimethyl isophthalate, dimethyl terephthalate and diphenyl terephthalate. The carboxylic acid component may be used alone, or 2 or more thereof may be used in combination.
As the polyol component, a diol is typically mentioned. Examples of the diol include aliphatic diols, alicyclic diols, and aromatic diols. Examples of the aliphatic diol include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1, 3-propanediol, 2, 4-dimethyl-2-ethylhexane-1, 3-diol, 2-dimethyl-1, 3-propanediol (neopentyl glycol), 2-ethyl-2-butyl-1, 3-propanediol, 2-ethyl-2-isobutyl-1, 3-propanediol, 1, 3-butanediol, 1, 4-butanediol, 1, 5-pentanediol, 1, 6-hexanediol, 3-methyl-1, 5-pentanediol, and 2,2, 4-trimethyl-1, 6-hexanediol. Examples of the alicyclic diol include 1, 2-cyclohexanedimethanol, 1, 3-cyclohexanedimethanol, 1, 4-cyclohexanedimethanol, spiroglycol, tricyclodecanedimethanol, adamantanediol, and 2,2,4, 4-tetramethyl-1, 3-cyclobutanediol. Examples of the aromatic diol include 4,4 '-thiodiphenol, 4' -methylenediphenol, 4 '- (2-norbornylene) diphenol, 4' -dihydroxybiphenol, o-dihydroxybenzene, m-dihydroxybenzene, p-dihydroxybenzene, 4 '-isopropylidene phenol, 4' -isopropylidene bis (2, 6-dichlorophenol), 2, 5-naphthalenediol, and p-xylylene glycol. The polyol component may be used alone or in combination of 2 or more.
The polyester resin is preferably polyethylene terephthalate and/or modified polyethylene terephthalate, and more preferably polyethylene terephthalate. When these resins are used, a polyester film having excellent mechanical properties and little generation of rainbow unevenness can be obtained. The polyethylene terephthalate and the modified polyethylene terephthalate may be used in combination.
Examples of the modified polyethylene terephthalate include modified polyethylene terephthalate containing a constituent unit derived from diethylene glycol, 1, 4-butanediol, 1, 3-propanediol, or isophthalic acid. The proportion of diethylene glycol in the polyol component is preferably more than 0 mol% and 10 mol% or less, more preferably more than 0 mol% and 3 mol% or less. The proportion of 1, 4-butanediol in the polyol component is preferably more than 0 mol% and 10 mol% or less, more preferably more than 0 mol% and 3 mol% or less. The proportion of 1, 3-propanediol in the polyol component is preferably more than 0 mol% and 10 mol% or less, more preferably more than 0 mol% and 3 mol% or less. The proportion of isophthalic acid in the carboxylic acid component is preferably more than 0 mol% and 10 mol% or less, more preferably more than 0 mol% and 8 mol% or less. Within such a range, a polyester film having good crystallinity can be obtained. The mol% described above is mol% based on the total amount of all the repeating units of the polymer.
The weight average molecular weight of the polyester resin is preferably 10000 to 100000, more preferably 20000 to 75000. When the weight average molecular weight is such as this, a film having excellent mechanical strength and being easy to handle at the time of molding can be obtained. The weight average molecular weight can be measured by GPC (solvent: THF).
In one embodiment, a polyester film with an easy-adhesion layer is provided. The easy-adhesion layer contains, for example, an aqueous polyurethane and an oxazoline crosslinking agent. The easy adhesion layer is described in detail in, for example, japanese patent application laid-open No. 2010-55062. The entire disclosure of this publication is incorporated herein by reference.
In 1 embodiment, the easy adhesion layer contains any suitable fine particles. By forming the easy-adhesion layer containing fine particles, blocking occurring at the time of winding can be effectively suppressed. The fine particles may be inorganic fine particles or organic fine particles. Examples of the inorganic fine particles include inorganic oxides such as silica, titania, alumina, and zirconia, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate, and calcium phosphate. Examples of the organic fine particles include silicone resins, fluorine resins, and (meth) acrylic resins. Among these, silica is preferable.
The particle diameter (number-average primary particle diameter) of the fine particles is preferably 10nm to 200nm, more preferably 20nm to 60 nm.
The thickness of the easy adhesion layer is preferably 2 μm or less, more preferably 1 μm or less, and still more preferably 0.35 μm or less. Within such a range, a polyester film with an easy-adhesion layer, which hardly impairs optical characteristics of other members when applied to an image display device, can be obtained.
In 1 embodiment, the easy adhesion layer preferably has a refractive index of 1.45 to 1.60. Within such a range, a polyester film with an easy-adhesion layer, which hardly impairs optical characteristics of other members when applied to an image display device, can be obtained. In 1 embodiment, the easy adhesion layer has a refractive index of 1.54 or more.
In 1 embodiment, the polyester film may have an anti-blocking layer on at least one side thereof. The anti-blocking layer can be formed by the easy adhesion layer described above. Preferably, the anti-blocking layer comprises the above-described microparticles.
(method for producing polyester film)
The polyester film can be obtained through the following steps: a molding step of molding a film-forming material (resin composition) containing the polyester resin into a film, and a stretching step of stretching the molded film. Preferably, the stretching step includes a preheating treatment of the film performed before the film stretching and a heat treatment performed after the film stretching. In 1 embodiment, the polyester film is provided in a long form (or a form cut out from a long form).
The film-forming material may contain an additive other than the polyester resin, and may contain a solvent. As the additive, any suitable additive may be used according to the purpose. Specific examples of the additives include reactive diluents, plasticizers, surfactants, fillers, antioxidants, anti-aging agents, ultraviolet absorbers, leveling agents, thixotropic agents, antistatic agents, conductive materials, and flame retardants. The amount, kind, combination, addition amount, and the like of the additives may be appropriately set according to the purpose.
As a method for forming a thin film from a thin film-forming material, any appropriate forming process can be used. Specific examples thereof include compression molding, transfer molding, injection molding, extrusion molding, blow molding, powder molding, FRP molding, casting coating (for example, casting), calendering, and hot pressing. Extrusion molding or cast coating is preferred. This is because the smoothness of the obtained film can be improved and good optical uniformity can be obtained.
The film may be stretched in a unidirectional or bidirectional manner.
In 1 embodiment, the film is stretched in the longitudinal direction (MD) by uniaxial stretching as a stretching method of the film.
The biaxial stretching may be sequential biaxial stretching or simultaneous biaxial stretching. Sequential biaxial stretching or simultaneous biaxial stretching is typically performed using a tenter stretching machine. Therefore, the stretching direction of the film is typically the longitudinal direction (MD) and the width direction (TD) of the film.
In 1 embodiment, as the stretching method of the film, sequential biaxial stretching is used. The polyester film is preferably obtained by TD stretching followed by MD stretching. In this way, the influence of the bending (bowing) generated during TD stretching can be alleviated, and the angle formed by the 1 st direction (MD) of the polyester film and the slow axis can be set to an appropriate value.
The stretching temperature is preferably from Tg +5 ℃ to Tg +50 ℃, more preferably from Tg +5 ℃ to Tg +30 ℃, and still more preferably from Tg +6 ℃ to Tg +10 ℃ relative to the glass transition temperature (Tg) of the film. By stretching at such a temperature, a polyester film in which the slow axis direction and the linear expansion coefficient are well-controlled can be obtained. Further, a polyester film having excellent transparency can be obtained.
The stretching magnification in the MD is preferably 1 to 7 times, more preferably 2.5 to 6.5 times, and further preferably 3 to 6 times. Within such a range, a polyester film having good crystallinity and excellent durability can be obtained while controlling the linear expansion coefficient within a desired range.
The stretching ratio in TD is preferably 1 to 7 times, more preferably 1.2 to 4 times, and further preferably 1.5 to 3.5 times. Within such a range, a polyester film having good crystallinity and excellent durability can be obtained by controlling the linear expansion coefficient to a desired range.
The ratio of the stretching ratio in TD to the stretching ratio in MD (MD stretching ratio/TD stretching ratio) is preferably 1 to 4, more preferably 1 to 2. Within such a range, a polyester film with particularly little occurrence of rainbow unevenness can be obtained. In addition, when the obtained polyester film is used, cracks can be prevented from being generated in the polarizer, and a polarizing plate with excellent durability can be obtained.
The stretching speed in the MD is preferably 5%/sec to 100%/sec, more preferably 8%/sec to 80%/sec, and still more preferably 8%/sec to 60%/sec. Within such a range, a polyester film having excellent optical properties, good crystallinity and excellent durability can be obtained.
The stretching speed in TD is preferably 5%/sec to 100%/sec, more preferably 8%/sec to 80%/sec, and still more preferably 8%/sec to 60%/sec. Within such a range, a polyester film having excellent optical properties, good crystallinity and excellent durability can be obtained.
The temperature of the preheating treatment is preferably 80 to 150 ℃ and more preferably 90 to 130 ℃. The time of the preheating treatment is preferably 10 seconds to 100 seconds, more preferably 15 seconds to 80 seconds. Within such a range, a polyester film having excellent optical properties, good crystallinity and excellent durability can be obtained.
The temperature of the heat treatment is preferably 100 to 250 ℃, more preferably 120 to 200 ℃, and still more preferably 130 to 180 ℃. Within such a range, a polyester film having excellent transparency, good crystallinity and excellent durability can be obtained. The time for the heat treatment is preferably 2 seconds to 50 seconds, more preferably 5 seconds to 40 seconds, and further preferably 8 seconds to 30 seconds. Within such a range, a polyester film having excellent transparency, good crystallinity and excellent durability can be obtained.
B. Polarizing plate
Fig. 1 is a schematic cross-sectional view of a polarizing plate according to 1 embodiment of the present invention. The polarizing plate 100 includes: a polarizer 10, and a polyester film 20 disposed on one side of the polarizer 10. The polyester film 20 used in the present invention described in the above item A. Any other polarizer protective film may be disposed on the other side of the polarizer, or the polarizer protective film may not be disposed. In embodiment 1, the polarizer 10 and the polyester film 20 (or other polarizer protective film) are laminated via the adhesive layer 30.
In 1 embodiment, the polarizing plate may be applied to an image display device such that a side on which the polyester film is disposed is a visual side. When the polarizing plate is applied to a liquid crystal display device, the polarizing plate provided with a polyester film may be disposed on the viewing side of the liquid crystal cell or on the back side.
As the polarizer, any suitable polarizer may be used. For example, the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
Specific examples of polarizers made of a single-layer resin film include those obtained by subjecting a hydrophilic polymer film such as a polyvinyl alcohol (PVA) film, a partially formalized PVA film, or an ethylene-vinyl acetate copolymer partially saponified film to a dyeing treatment and a stretching treatment with a dichroic material such as iodine or a dichroic dye; and polyene-based oriented films such as dehydrated products of PVA and desalted products of polyvinyl chloride. From the viewpoint of excellent optical properties, it is preferable to use a polarizer obtained by dyeing a PVA-based film with iodine and uniaxially stretching the PVA film.
The iodine-based dyeing is performed by, for example, immersing the PVA-based film in an aqueous iodine solution. The stretching ratio of the uniaxial stretching is preferably 3 to 7 times. The stretching may be performed after the dyeing treatment, or may be performed while dyeing. Further, dyeing may be performed after stretching. The PVA-based film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, and the like as necessary. For example, by immersing the PVA-based film in water and washing it with water before dyeing, not only stains and antiblocking agents on the surface of the PVA-based film can be washed, but also the PVA-based film can be swollen to prevent uneven dyeing and the like.
Specific examples of the polarizer obtained using the laminate include polarizers obtained using: a laminate of a resin substrate and a PVA type resin layer (PVA type resin film) laminated on the resin substrate, or a laminate of a resin substrate and a PVA type resin layer coated and formed on the resin substrate. A polarizer obtained using a laminate of a resin substrate and a PVA-based resin layer formed on the resin substrate by coating can be produced, for example, as follows: coating a PVA-based resin solution on a resin base material and drying the coating to form a PVA-based resin layer on the resin base material, thereby obtaining a laminate of the resin base material and the PVA-based resin layer; the laminate is stretched and dyed to form a polarizing element from the PVA resin layer. In the present embodiment, the stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching. Further, the stretching may include, if necessary, in-air stretching the laminate at a high temperature (for example, 95 ℃ or higher) before the stretching in the aqueous boric acid solution. The obtained resin base material/polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer for the polarizer), or the resin base material may be peeled off from the resin base material/polarizer laminate and an arbitrary appropriate protective layer suitable for the purpose may be laminated on the peeled surface. The details of the method for producing such a polarizer are described in, for example, japanese patent laid-open No. 2012-73580. The entire disclosure of this publication is incorporated herein by reference.
The thickness of the polarizer is, for example, 1 μm to 80 μm. In 1 embodiment, the thickness of the polarizer is preferably 20 μm or less, and more preferably 3 to 15 μm. When the polyester film of the present invention is used, cracks of the polarizer can be effectively prevented, and therefore, a thin polarizer can be used even under severe environments such as high temperature and large temperature change.
The polarizer and the polarizer protective film (polyester film) may be laminated via any appropriate adhesive layer. Preferably, the adhesive layer is formed of an adhesive composition containing a polyvinyl alcohol resin.
The absorption axis direction of the polarizer is preferably substantially parallel to the 1 st direction (typically MD) or the 2 nd direction (typically TD) of the polyester film, and more preferably substantially parallel to the 1 st direction (typically MD). In this configuration, the polyester film and the polarizer can preferably change their shapes in synchronization with each other. As a result, cracks in the polarizer can be prevented.
The more preferably the angle formed by the slow axis of the polyester film and the absorption axis direction of the polarizer is matched, the more preferably the angle formed by the 2 axes is 0 ° ± 10 °, more preferably 0 ° ± 7 °, and still more preferably 0 ° ± 5 °. Within such a range, a polyester film with less occurrence of rainbow unevenness when applied to an image display device can be obtained. Note that the slow axis angle is an angle when the roller flow direction is set to 0 °.
In the polarizing plate, the absolute value of the difference between the linear expansion coefficient of the polyester film in the 1 st direction and the linear expansion coefficient of the polarizer in the direction parallel to the 1 st direction is preferably 2.0 × 10-5Lower than/° C, more preferably 1.5 × 10-5Lower than/° C, more preferably 1.0X 10-5Below/° c. Within such a range, the polarizer can be prevented from cracking even under severe environments such as high temperature and large temperature change. Linear expansion coefficient of polyester film in 1 st direction and linear expansion of polarizer in direction parallel to 1 st directionThe lower limit of the absolute value of the difference in expansion coefficient is preferably smaller, and may be, for example, 0.1 × 10-5/℃。
In the polarizing plate, the absolute value of the difference between the linear expansion coefficient of the polyester film in the 2 nd direction (direction orthogonal to the 1 st direction) and the linear expansion coefficient of the polarizer in the direction parallel to the 2 nd direction is preferably 2.0 × 10-5Lower than/° C, more preferably 1.5 × 10-5Lower than/° C, more preferably 1.0X 10-5Below/° c. Within such a range, the polarizer can be prevented from cracking even under severe environments such as high temperature and large temperature change. The lower limit of the absolute value of the difference between the linear expansion coefficient of the polyester film in the 2 nd direction and the linear expansion coefficient of the polarizer in the direction parallel to the 2 nd direction is preferably smaller, and may be, for example, 0.1X 10-5/℃。
In 1 embodiment, the absolute value of the difference between the linear expansion coefficient of the polyester film in the 1 st direction and the linear expansion coefficient of the polarizer in the direction parallel to the 1 st direction, and the absolute value of the difference between the linear expansion coefficient of the polyester film in the 2 nd direction (the direction orthogonal to the 1 st direction) and the linear expansion coefficient of the polarizer in the direction parallel to the 2 nd direction are both 2.0 × 10-5Lower than/° C (preferably 1.0X 10)-5Below/° c). Within such a range, the polarizer can be prevented from cracking even under severe environments such as high temperature and large temperature change.
Fig. 2 is a schematic cross-sectional view of a polarizing plate according to another embodiment of the present invention. The polarizing plate 200 further includes an easy-adhesion layer 40 disposed on the polarizer 10 side of the polyester film 20. In embodiment 1, the easy-adhesive layer-attached polyester film a is disposed on the polarizer 10 so that the easy-adhesive layer 40 is on the polarizer 10 side. The easy adhesion layer may be the easy adhesion layer described in the above item a.
C. Image display device
The polarizing plate can be applied to an image display device. As typical examples of the image display device, a liquid crystal display device and an organic Electroluminescence (EL) display device can be given. Since the image display device has a structure known in the art, detailed description thereof will be omitted.
Examples
The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The measurement methods of the characteristics in the examples are as follows. Unless otherwise specified, "parts" and "%" in the examples are based on weight.
(1) Orientation angle (slow axis expression direction)
The center portions of the polyester films obtained in examples and comparative examples were cut into square shapes having a width of 50mm and a length of 50mm so that one side of the center portion was parallel to the width direction of the film, to prepare samples. The sample was measured by means of a Mueller matrix polarimeter (product name "Axoscan" manufactured by Axometrics), and the orientation angle θ at a wavelength of 550nm and 23 ℃ was measured. The orientation angle θ was measured in a state where the sample was placed in parallel on the measurement table.
(2) Coefficient of linear expansion
The linear expansion coefficients of the polyester film and the polarizer were measured by heating the test film from 30 ℃ to 150 ℃ at a rate of 10 ℃ per minute using a thermomechanical analyzer "TMA 7000" manufactured by Hitachi High-Tech Science Corporation in accordance with JIS K7197, and measuring the deformation amounts of the test film at the respective temperatures. Then, the linear expansion coefficient of the film was determined from the amount of deformation in the temperature range of 30 to 70 ℃. Note that, the case where the film size increases (expands) with an increase in temperature is referred to as positive (+) and the case where the film size decreases (contracts) with an increase in temperature is referred to as negative (-) respectively.
The polyester film was measured for its linear expansion coefficient in MD (1 st direction) and TD (2 nd direction). For the polarizer, the linear expansion coefficients in the polarizing plate in the direction parallel to the MD and the direction parallel to the TD were measured.
(3) Degree of crystallinity
The crystallinity of the polyester films used in examples and comparative examples was measured by Differential Scanning Calorimetry (DSC). The calorific value and the amount of fusion heat observed at the temperature rise of the sample to 300 ℃ at 10 ℃/min were determined, and the crystallinity was determined by the following equation. The calorific value and the quantity of heat of fusion were measured using Q-2000 manufactured by TA instruments.
Degree of crystallinity (%) (heat of fusion obtained in measurement-calorific value obtained in measurement)/degree of crystallinity 100% heat of fusion of polyethylene terephthalate (119mJ/mg) × 100
(4) Rainbow spot
The liquid crystal cell was taken out from liquid crystal TV "45 UH 7500" manufactured by LGD corporation, and the polarizing plate on the backlight side was peeled off. The polarizing plates obtained in examples and comparative examples were bonded to the surface of the liquid crystal TV from which the polarizing plate was peeled via an adhesive so that the absorption axis of the polarizer became the short side of the liquid crystal TV. The liquid crystal cell to which the polarizing plate obtained in example and comparative example was attached was set again, and the TV was lit to white display.
The liquid crystal TV was visually observed in all directions at a polar angle of 60 ° to observe the presence or absence of rainbow spots. Evaluation was performed according to the following criteria.
O: no iridescent plaques were observed
And (delta): slight iridescent spotting was observed
X: obvious rainbow spots were observed
(5) Dimensional change
The polyester films used in examples and comparative examples were cut into 100mm × 100 mm. Thereafter, the film was placed in a heating oven at 100 ℃ for 24 hours, and then the film was taken out, and the dimensions were measured again accurately, and the dimensions were confirmed with a metal ruler to determine the dimensional change. The state of the sample was visually confirmed, and the evaluation was performed according to the following criteria.
O: without significant shrinkage above 1mm
X: having a shrinkage or deformation of more than 1mm
(6) Crack test (thermal shock acceleration test)
The polarizing plates obtained in examples and comparative examples were evaluated by a cold thermal impact tester (manufactured by ESPEC).
The polarizing plates obtained in examples and comparative examples were cut into a size of 50mm in width by 150mm in length. At this time, a sample in which the absorption axis direction of the polarizer is parallel to the lateral direction (short side) of the cut polarizing plate and a sample in which the transmission axis direction of the polarizer is parallel to the lateral direction (short side) of the cut polarizing plate were prepared. A sample was prepared by laminating the surface of the polarizing plate on which the protective film (polyester film) was not laminated with an alkali-free glass having a thickness of 0.5mm via an acrylic adhesive.
The obtained sample was placed in the test area of a cold-hot impact tester, and the temperature in the test area was decreased from room temperature to-40 ℃ over 30 minutes. Subsequently, the temperature in the test area was raised to 85 ℃ over 30 minutes, and then, the temperature was again lowered to-40 ℃ over 30 minutes. The step of raising the temperature from-40 ℃ to 85 ℃ and lowering the temperature again to-40 ℃ was repeated for 100 cycles and 200 cycles using 1 cycle, and then the laminate was taken out and the presence of cracks was visually checked, and evaluated according to the following criteria.
Very good: no cracks were observed even after repeating 300 cycles.
O: no cracks were observed after repeating 200 cycles but cracks were generated after repeating 300 cycles.
And (delta): no cracks were observed after repeating 100 cycles but cracks were generated after repeating 200 cycles.
X: cracks were generated after repeating 100 cycles.
Production example 1 production of polarizing plate A
As the substrate, a long-sized amorphous isophthalic acid-copolymerized polyethylene terephthalate (IPA-copolymerized PET) film (thickness: 100 μm) having a water absorption of 0.75% and a Tg of 75 ℃ was used. One side of the substrate was subjected to corona treatment, and the corona-treated side was coated with a coating of 9: a laminate was prepared by drying an aqueous solution containing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200, acetoacetyl-modified degree 4.6%, saponification degree 99.0 mol% or more, product name "GOHSEFIMER Z200" manufactured by Nippon synthetic chemical industries Co., Ltd.) at a ratio of 1 to form a PVA-based resin layer having a thickness of 11 μm.
The resultant laminate was subjected to free-end unidirectional stretching in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in an oven at 120 ℃ by a factor of 2.0 (in-air auxiliary stretching).
Next, the laminate was immersed in an insolubilization bath (an aqueous boric acid solution prepared by adding 4 parts by weight of boric acid to 100 parts by weight of water) at a liquid temperature of 30 ℃ for 30 seconds (insolubilization treatment).
Then, the polarizing plate was immersed in a dyeing bath at a liquid temperature of 30 ℃ while adjusting the iodine concentration and immersion time so as to have a predetermined transmittance. In this example, an aqueous iodine solution containing 0.2 parts by weight of iodine and 1.5 parts by weight of potassium iodide was immersed in 100 parts by weight of water for 60 seconds (dyeing treatment).
Next, the substrate was immersed in a crosslinking bath (aqueous boric acid solution prepared by adding 3 parts by weight of potassium iodide to 100 parts by weight of water and 3 parts by weight of boric acid) at a liquid temperature of 30 ℃ for 30 seconds (crosslinking treatment).
Thereafter, while the laminate was immersed in an aqueous boric acid solution (an aqueous solution prepared by adding 4 parts by weight of boric acid to 100 parts by weight of water and 5 parts by weight of potassium iodide) having a liquid temperature of 70 ℃.
Thereafter, the laminate was immersed (cleaned) in a cleaning bath (aqueous solution prepared by adding 4 parts by weight of potassium iodide to 100 parts by weight of water) at a liquid temperature of 30 ℃.
Production example 2 production of polarizing plate B
A polarizer B with a peelable base was obtained in the same manner as in production example 1, except that the stretching ratio in underwater stretching was set to 4.6 times.
Production example 3 production of polyester film A
A Polyester resin (polyethylene terephthalate, Bell Polyester Products, Inc., 2.5 mol% of isophthalic acid modification amount (mol% based on the total amount of all the repeating units in the polymer), 1.0 mol% of diethylene glycol modification amount (mol% based on the total amount of all the repeating units in the polymer), and an IV value of 0.77dl/g (phenol: 1,1,2,2, -tetrachloroethane: 6: 4 mixed solvent solution concentration of 0.4g/dl) were vacuum-dried at 100 ℃ for 10 hours, and then an amorphous Polyester resin film having a thickness of 200 μm was produced using a film forming apparatus equipped with a single-screw extruder (manufactured by Toyo Seiki Seiko Co., Ltd., screw diameter of 25mm, cylinder setting temperature of 280 ℃), a T-die (width of 500mm, setting temperature of 280 ℃), a chill roll (setting temperature of 50 ℃) and a winder.
The obtained amorphous polyester resin film was simultaneously biaxially stretched by a stretcher KAROIV of Bruckner to obtain a polyester film A (slow axis angle in the longitudinal direction: -0.5 °, in-plane phase Re (590): 80nm, thickness: 17 μm). The stretch ratio was 4 times in the longitudinal direction (MD) and 3 times in the width direction (TD). The stretching temperature was 90 ℃ and the stretching speed was 30%/sec in both MD and TD. After the stretching treatment, the sheet was heat-treated at 180 ℃ for 10 seconds while maintaining the dimensions.
Production example 4 production of polyester film I
A Polyester resin (polyethylene terephthalate, Bell Polyester Products, Inc., IV value 0.75dl/g (phenol: 1,1,2,2, -tetrachloroethane:. 6: 4 mixed solvent solution concentration 0.4g/dl) was vacuum-dried at 100 ℃ for 10 hours, and then an amorphous Polyester resin film having a thickness of 200 μm was produced using a film-forming apparatus equipped with a single-screw extruder (Toyo Seiki Seisaku-Sho Co., Ltd., screw diameter 25mm, cylinder set temperature: 280 ℃), T-die (width 500mm, set temperature: 280 ℃), chill roll (set temperature: 50 ℃) and winder.
The obtained amorphous polyester resin film was simultaneously biaxially stretched by a stretcher KAROIV of Bruckner to obtain a polyester film I (slow axis angle in the longitudinal direction: -2.5 °, in-plane phase Re (590): 271nm, thickness: 22 μm). The stretching ratio was 3 times in the longitudinal direction (MD) and 3 times in the width direction (TD). The stretching temperature was 90 ℃ and the stretching speed was 2%/sec in both MD and TD. After the stretching treatment, the sheet was heat-treated at 140 ℃ for 10 seconds while maintaining the dimensions.
Production example 5 production of polyester film II
A polyester film II (slow axis angle in the longitudinal direction: 11.9 °, in-plane phase Re (590): 54nm, thickness: 50 μm) was obtained in the same manner as in production example 4 except that the stretching magnification was 2 times in the longitudinal direction (MD), 2 times in the width direction (TD), and the stretching speed was 2%/sec for both MD and TD, and heat treatment was performed at 140 ℃ for 10 seconds after the stretching treatment.
Production example 6 production of polyester film III
A polyester film III (slow axis angle in the longitudinal direction: -0.6 °, in-plane phase Re (590): 2823nm, thickness: 41 μm) was obtained in the same manner as in production example 4 except that the draw ratio was 6 times in the longitudinal direction (MD) and 1 time in the width direction (TD) in the fixed-end drawing, the drawing speed was 2%/sec in both MD and TD, and heat treatment was performed at 140 ℃ for 10 seconds after the drawing treatment.
Production example 7 production of polyester film IV
A Polyester resin (polyethylene terephthalate, Bell Polyester Products, Inc., 2.5 mol% of isophthalic acid modification amount (mol% based on the total amount of all the repeating units in the polymer), 1.0 mol% of diethylene glycol modification amount (mol% based on the total amount of all the repeating units in the polymer), and an IV value of 0.77dl/g (phenol: 1,1,2,2, -tetrachloroethane: 6: 4 mixed solvent solution concentration of 0.4g/dl) were vacuum-dried at 100 ℃ for 10 hours, and then an amorphous Polyester resin film having a thickness of 100 μm was produced using a film-forming apparatus equipped with a single-screw extruder (manufactured by Toyo Seiki Seiko Co., Ltd., screw diameter of 25mm, cylinder set temperature of 280 ℃), T-die (width of 500mm, set temperature of 280 ℃), chill roll (set temperature: 50 ℃) and winder.
The obtained amorphous polyester resin film was simultaneously biaxially stretched by a stretcher KAROIV of Bruckner to obtain a polyester film IV (slow axis angle in the longitudinal direction: 0.9 degrees, in-plane phase Re (590): 3191nm, thickness: 38 μm). The stretching magnification was 7 times in the longitudinal direction (MD) and 1 time in the width direction (TD) in the fixed-end stretching. The stretching temperature was 90 ℃ and the stretching speed was 10%/sec in both MD and TD. After the stretching treatment, the sheet was heat-treated at 140 ℃ for 10 seconds while maintaining the dimensions.
Production example 8 production of polyester film V
A polyester film V (slow axis angle: 3.0 degrees in-plane phase Re (590): 17nm, thickness: 50 μm) was obtained in the same manner as in production example 7 except that the film thickness was 50 μm and stretching was not performed.
Production example 9 production of polyester film VI
A Polyester resin (polyethylene terephthalate, Bell Polyester Products, Inc., having an isophthalic acid modification amount of 2.5 mol% (mol number based on the total amount of all repeating units of the polymer) and an IV value of 0.77dl/g (phenol: 1,1,2,2, -tetrachloroethane: 6: 4 mixed solvent solution concentration of 0.4g/dl) was dried under vacuum at 100 ℃ for 10 hours, and then an amorphous Polyester resin film having a thickness of 170 μm was produced using a film forming apparatus equipped with a single-screw extruder (manufactured by Toyo Seiki Seiko Seisaku-Sho Co., Ltd., screw diameter of 25mm, cylinder set temperature of 280 ℃), T die (width of 500mm, set temperature of 280 ℃), chill roll (set temperature of 50 ℃) and winder.
The film was stretched in a free end direction in a longitudinal direction (lengthwise direction) to 2.0 times between rolls having different peripheral speeds in an oven at 120 ℃.
Subsequently, the sheet was immersed in water having a liquid temperature of 30 ℃ for 120 seconds, and then uniaxially stretched (underwater stretch) between rolls having different peripheral speeds so that the total stretch ratio was 5.5 times in the longitudinal direction (longitudinal direction) while immersing the sheet in water having a liquid temperature of 73 ℃.
The resulting stretched film was heat-treated at 90 ℃ for 10 seconds by a stretcher KAROIV (manufactured by Bruckner Co., Ltd.) to obtain a polyester film VI (slow axis angle in the longitudinal direction: -0.2 °, in-plane phase Re (590): 3243nm, thickness: 35 μm).
Production example 10 production of polyester film VII
A stretched film was obtained in the same manner as in production example 9.
The resulting stretched film was heat-treated at 90 ℃ for 10 seconds and further at 140 ℃ for 10 seconds by a stretcher KAROIV of Bruckner to obtain a polyester film VII (slow axis angle in the longitudinal direction: -0.4 °, in-plane phase Re (590): 4052nm, thickness: 35 μm).
[ example 1]
The polyester film a produced in production example 3 was subjected to corona treatment, and an aqueous solution in which 15.2 wt% of a product name "SUPERFLEX 210R" manufactured by first Industrial pharmaceutical Co., Ltd and 2.7 wt% of a product name "WS-700" manufactured by Nippon Shokubai Co., Ltd were dissolved was applied so that the film thickness became 300 μm after drying, and drying was performed at 80 ℃ for 1 minute to obtain a polyester film a with an easy adhesive layer.
An aqueous PVA type resin solution (trade name "GOHSEFIMER (registered trademark) Z-200", manufactured by japan synthetic chemical industries, ltd.) was applied to the surface of the polarizer with a base material obtained in production example 1, and a polyester film with the easy-adhesion layer was bonded thereto at a resin concentration of 3 wt%. The obtained laminate was heated in an oven maintained at 60 ℃ for 5 minutes. Thereafter, the substrate was peeled off from the PVA resin layer to obtain a polarizing plate (polarizer (transmittance: 42.3%, thickness: 5 μm)/protective film (polyester film)). The polyester film a and the polarizer are laminated such that the MD direction of the polyester film a is substantially parallel to the absorption axis direction of the polarizer.
The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
[ example 2]
A polarizing plate was obtained in the same manner as in example 1, except that the polarizer obtained in production example 2 was used instead of the polarizer with a base material obtained in production example 1. The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 1
A polarizing plate was obtained in the same manner as in example 1, except that the polyester film I produced in production example 4 was used instead of the polyester film a produced in production example 3.
The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 2
A polarizing plate was obtained in the same manner as in example 1, except that the polyester film II produced in production example 5 was used instead of the polyester film a produced in production example 3.
The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 3
A polarizing plate was obtained in the same manner as in example 1, except that the polyester film III produced in production example 6 was used instead of the polyester film a produced in production example 3.
The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 4
A polarizing plate was obtained in the same manner as in example 1, except that the polyester film IV produced in production example 7 was used instead of the polyester film a produced in production example 3.
The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 5
A polarizing plate was obtained in the same manner as in example 1 except that a polyester film a (product name: Cosmoline A4100, manufactured by Toyo chemical Co., Ltd.), having a slow axis angle of 90 DEG, an in-plane phase Re (590): 7800nm and a thickness of 75 μm in the longitudinal direction was used in place of the polyester film A produced in production example 3.
The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 6
A polarizing plate was obtained in the same manner as in example 1 except that a polyester film b (trade name "T100-J25" manufactured by Mitsubishi chemical Co., Ltd., slow axis angle: 27 DEG, in-plane phase Re (590): 525nm, thickness: 25 μm) was used in place of the polyester film A produced in production example 3.
The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 7
A polarizing plate was obtained in the same manner as in example 1, except that the polyester film V produced in production example 8 was used instead of the polyester film a produced in production example 3.
The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 8
A polarizing plate was obtained in the same manner as in example 1, except that the polyester film VI produced in production example 9 was used instead of the polyester film a produced in production example 3.
The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 9
A polarizing plate was obtained in the same manner as in example 1, except that the polyester film VII produced in production example 10 was used instead of the polyester film a produced in production example 3.
The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 10
A polarizing plate was obtained in the same manner as in comparative example 1, except that the polarizer obtained in production example 2 was used instead of the polarizer with a base material obtained in production example 1. The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 11
A polarizing plate was obtained in the same manner as in comparative example 3, except that the polarizer obtained in production example 2 was used instead of the polarizer with a base material obtained in production example 1. The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
Comparative example 12
A polarizing plate was obtained in the same manner as in comparative example 8, except that the polarizer obtained in production example 2 was used instead of the polarizer with a base material obtained in production example 1. The obtained polarizing plates were subjected to the above evaluations (1) to (6). The results are shown in Table 1.
[ Table 1]
Description of the reference numerals
10 polarizer
20 polyester film
30 adhesive layer
40 easy adhesive layer
100. 200 polarizing plate
Claims (8)
1. A polyester film having a linear expansion coefficient of 3.5X 10 in the 1 st direction-5A linear expansion coefficient of 3.5X 10 in a 2 nd direction perpendicular to the 1 st direction at a temperature of not more than DEG C-5Below/° c, the temperature of the composition,
the polyester film has a slow axis in a direction of-5 to 5 DEG with respect to the 1 st direction.
2. The polyester film according to claim 1, which has a crystallinity of 30% or more as measured by DSC.
3. A polarizing plate comprising: a polarizing member, and the polyester film according to claim 1 or 2 disposed on one side of the polarizing member.
4. The polarizing plate of claim 3, wherein the polarizing element has a thickness of 20 μm or less.
5. The polarizing plate according to any one of claims 3 and 4, further comprising an easy-adhesion layer disposed on the polarizer side of the polyester film.
6. The polarizing plate of claim 5, wherein the easy adhesion layer comprises particles.
7. The polarizing plate according to claim 5 or 6, wherein the easy adhesion layer has a thickness of 0.35 μm or less.
8. The polarizing plate according to any one of claims 5 to 7, wherein the easy-adhesion layer has a refractive index of 1.55 or less.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-016236 | 2019-01-31 | ||
| JP2019016236 | 2019-01-31 | ||
| PCT/JP2019/044777 WO2020158113A1 (en) | 2019-01-31 | 2019-11-14 | Polyester film, and polarizing plate comprising polyester film |
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| Publication Number | Publication Date |
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| CN113366353A true CN113366353A (en) | 2021-09-07 |
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| CN201980090908.7A Pending CN113366353A (en) | 2019-01-31 | 2019-11-14 | Polyester film and polarizing plate comprising same |
| CN201980090909.1A Pending CN113366354A (en) | 2019-01-31 | 2019-11-14 | Polyester film and polarizing plate comprising same |
| CN201980090929.9A Pending CN113474689A (en) | 2019-01-31 | 2019-11-14 | Polyester film and polarizing plate comprising same |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201980090909.1A Pending CN113366354A (en) | 2019-01-31 | 2019-11-14 | Polyester film and polarizing plate comprising same |
| CN201980090929.9A Pending CN113474689A (en) | 2019-01-31 | 2019-11-14 | Polyester film and polarizing plate comprising same |
Country Status (5)
| Country | Link |
|---|---|
| JP (6) | JPWO2020158114A1 (en) |
| KR (3) | KR20210121033A (en) |
| CN (3) | CN113366353A (en) |
| TW (3) | TW202030240A (en) |
| WO (3) | WO2020158112A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116964497A (en) | 2021-03-31 | 2023-10-27 | 日东电工株式会社 | Polyester film for protecting polarizer and polarizing plate using same |
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2019
- 2019-11-14 WO PCT/JP2019/044776 patent/WO2020158112A1/en active Application Filing
- 2019-11-14 KR KR1020217023475A patent/KR20210121033A/en unknown
- 2019-11-14 CN CN201980090908.7A patent/CN113366353A/en active Pending
- 2019-11-14 JP JP2020569394A patent/JPWO2020158114A1/en active Pending
- 2019-11-14 CN CN201980090909.1A patent/CN113366354A/en active Pending
- 2019-11-14 JP JP2020569393A patent/JPWO2020158113A1/en active Pending
- 2019-11-14 WO PCT/JP2019/044777 patent/WO2020158113A1/en active Application Filing
- 2019-11-14 KR KR1020217023476A patent/KR20210121034A/en unknown
- 2019-11-14 WO PCT/JP2019/044778 patent/WO2020158114A1/en active Application Filing
- 2019-11-14 KR KR1020217023474A patent/KR20210119986A/en unknown
- 2019-11-14 CN CN201980090929.9A patent/CN113474689A/en active Pending
- 2019-11-14 JP JP2020569392A patent/JPWO2020158112A1/en active Pending
- 2019-11-25 TW TW108142756A patent/TW202030240A/en unknown
- 2019-11-25 TW TW108142750A patent/TWI822910B/en active
- 2019-11-25 TW TW108142751A patent/TWI828805B/en active
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2023
- 2023-08-08 JP JP2023129046A patent/JP2023159195A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020158114A1 (en) | 2020-08-06 |
| WO2020158112A1 (en) | 2020-08-06 |
| JPWO2020158113A1 (en) | 2021-10-21 |
| TWI828805B (en) | 2024-01-11 |
| KR20210121033A (en) | 2021-10-07 |
| CN113474689A (en) | 2021-10-01 |
| JP2023159193A (en) | 2023-10-31 |
| JP2023159194A (en) | 2023-10-31 |
| TW202039652A (en) | 2020-11-01 |
| JPWO2020158114A1 (en) | 2021-10-21 |
| KR20210121034A (en) | 2021-10-07 |
| JPWO2020158112A1 (en) | 2021-10-21 |
| TWI822910B (en) | 2023-11-21 |
| TW202030239A (en) | 2020-08-16 |
| CN113366354A (en) | 2021-09-07 |
| JP2023159195A (en) | 2023-10-31 |
| KR20210119986A (en) | 2021-10-06 |
| TW202030240A (en) | 2020-08-16 |
| WO2020158113A1 (en) | 2020-08-06 |
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