WO2006068219A1 - セルロースアシレートフィルム - Google Patents
セルロースアシレートフィルム Download PDFInfo
- Publication number
- WO2006068219A1 WO2006068219A1 PCT/JP2005/023588 JP2005023588W WO2006068219A1 WO 2006068219 A1 WO2006068219 A1 WO 2006068219A1 JP 2005023588 W JP2005023588 W JP 2005023588W WO 2006068219 A1 WO2006068219 A1 WO 2006068219A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- cellulose acylate
- melt
- acylate film
- cellulose
- Prior art date
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- 229920002678 cellulose Polymers 0.000 title claims abstract description 191
- 239000001913 cellulose Substances 0.000 title claims abstract description 185
- ODIGIKRIUKFKHP-UHFFFAOYSA-N (n-propan-2-yloxycarbonylanilino) acetate Chemical compound CC(C)OC(=O)N(OC(C)=O)C1=CC=CC=C1 ODIGIKRIUKFKHP-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 80
- 239000000155 melt Substances 0.000 claims abstract description 51
- 150000001875 compounds Chemical class 0.000 claims description 65
- 239000007788 liquid Substances 0.000 claims description 52
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 34
- 230000015572 biosynthetic process Effects 0.000 claims description 29
- 238000006116 polymerization reaction Methods 0.000 claims description 28
- 230000003287 optical effect Effects 0.000 claims description 22
- 238000005266 casting Methods 0.000 claims description 20
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 17
- 229930195729 fatty acid Natural products 0.000 claims description 17
- 239000000194 fatty acid Substances 0.000 claims description 17
- 238000006467 substitution reaction Methods 0.000 claims description 17
- 150000004665 fatty acids Chemical class 0.000 claims description 14
- 125000001501 propionyl group Chemical group O=C([*])C([H])([H])C([H])([H])[H] 0.000 claims description 14
- 125000003118 aryl group Chemical group 0.000 claims description 10
- 125000004432 carbon atom Chemical group C* 0.000 claims description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 7
- 235000018936 Vitellaria paradoxa Nutrition 0.000 claims description 7
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 6
- 125000004063 butyryl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 4
- 239000013557 residual solvent Substances 0.000 claims description 4
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical group CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 125000003774 valeryl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 66
- 230000008569 process Effects 0.000 abstract description 12
- 239000010408 film Substances 0.000 description 278
- 239000010410 layer Substances 0.000 description 144
- -1 phosphoric acid ester compounds Chemical class 0.000 description 62
- GPLRAVKSCUXZTP-UHFFFAOYSA-N diglycerol Chemical class OCC(O)COCC(O)CO GPLRAVKSCUXZTP-UHFFFAOYSA-N 0.000 description 45
- 229940105990 diglycerin Drugs 0.000 description 43
- 229920000642 polymer Polymers 0.000 description 37
- 238000000576 coating method Methods 0.000 description 28
- 230000012447 hatching Effects 0.000 description 23
- 230000000694 effects Effects 0.000 description 21
- 239000011248 coating agent Substances 0.000 description 19
- 239000000243 solution Substances 0.000 description 19
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 18
- 125000000524 functional group Chemical group 0.000 description 17
- 239000000463 material Substances 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 239000004372 Polyvinyl alcohol Substances 0.000 description 16
- 230000006870 function Effects 0.000 description 16
- 229920002451 polyvinyl alcohol Polymers 0.000 description 16
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 16
- 210000002858 crystal cell Anatomy 0.000 description 15
- 239000004014 plasticizer Substances 0.000 description 15
- 239000003431 cross linking reagent Substances 0.000 description 14
- 239000000975 dye Substances 0.000 description 14
- 239000000203 mixture Substances 0.000 description 13
- 239000002245 particle Substances 0.000 description 13
- 239000000126 substance Substances 0.000 description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 12
- 239000011230 binding agent Substances 0.000 description 12
- 239000000654 additive Substances 0.000 description 11
- 230000008859 change Effects 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000001035 drying Methods 0.000 description 11
- 239000000178 monomer Substances 0.000 description 11
- 239000003960 organic solvent Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000003513 alkali Substances 0.000 description 9
- 238000004132 cross linking Methods 0.000 description 9
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- 230000035882 stress Effects 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000000996 additive effect Effects 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 8
- 229910052731 fluorine Inorganic materials 0.000 description 8
- 239000005268 rod-like liquid crystal Substances 0.000 description 8
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical group CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 7
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 239000010419 fine particle Substances 0.000 description 7
- 239000011737 fluorine Substances 0.000 description 7
- 239000002609 medium Substances 0.000 description 7
- 229920001451 polypropylene glycol Polymers 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerol Natural products OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000006087 Silane Coupling Agent Substances 0.000 description 6
- 125000002252 acyl group Chemical group 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 230000001976 improved effect Effects 0.000 description 6
- 150000002484 inorganic compounds Chemical class 0.000 description 6
- 229910010272 inorganic material Inorganic materials 0.000 description 6
- 238000004381 surface treatment Methods 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 5
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 5
- XBDQKXXYIPTUBI-UHFFFAOYSA-N Propionic acid Chemical group CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 5
- 210000004027 cell Anatomy 0.000 description 5
- 229920002301 cellulose acetate Polymers 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000007654 immersion Methods 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 4
- 229920008347 Cellulose acetate propionate Polymers 0.000 description 4
- 108010010803 Gelatin Proteins 0.000 description 4
- UXDDRFCJKNROTO-UHFFFAOYSA-N Glycerol 1,2-diacetate Chemical compound CC(=O)OCC(CO)OC(C)=O UXDDRFCJKNROTO-UHFFFAOYSA-N 0.000 description 4
- CNCOEDDPFOAUMB-UHFFFAOYSA-N N-Methylolacrylamide Chemical compound OCNC(=O)C=C CNCOEDDPFOAUMB-UHFFFAOYSA-N 0.000 description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000003373 anti-fouling effect Effects 0.000 description 4
- 150000001244 carboxylic acid anhydrides Chemical class 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000008273 gelatin Substances 0.000 description 4
- 229920000159 gelatin Polymers 0.000 description 4
- 235000019322 gelatine Nutrition 0.000 description 4
- 235000011852 gelatine desserts Nutrition 0.000 description 4
- 150000002430 hydrocarbons Chemical group 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- 239000011630 iodine Substances 0.000 description 4
- 239000002346 layers by function Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 150000004706 metal oxides Chemical class 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 229920001223 polyethylene glycol Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- PPLUPPGMFOKIQT-UHFFFAOYSA-N (3-hydroxy-2-propanoyloxypropyl) propanoate Chemical compound CCC(=O)OCC(CO)OC(=O)CC PPLUPPGMFOKIQT-UHFFFAOYSA-N 0.000 description 3
- NBMAHNZMRSQCPG-UHFFFAOYSA-N 2,3-diacetyloxypropyl dodecanoate Chemical compound CCCCCCCCCCCC(=O)OCC(OC(C)=O)COC(C)=O NBMAHNZMRSQCPG-UHFFFAOYSA-N 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 3
- 239000004985 Discotic Liquid Crystal Substance Substances 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 3
- 238000006640 acetylation reaction Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 150000004703 alkoxides Chemical class 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 3
- 238000007766 curtain coating Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000003618 dip coating Methods 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 238000007756 gravure coating Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
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- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 150000002902 organometallic compounds Chemical class 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 238000009832 plasma treatment Methods 0.000 description 3
- 229920001515 polyalkylene glycol Polymers 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920006254 polymer film Polymers 0.000 description 3
- 239000003505 polymerization initiator Substances 0.000 description 3
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- 150000003384 small molecules Chemical class 0.000 description 3
- 150000005846 sugar alcohols Polymers 0.000 description 3
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- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 3
- 229920003169 water-soluble polymer Polymers 0.000 description 3
- CVVRAHPUFUYWAH-UHFFFAOYSA-N (3-acetyloxy-2-decanoyloxypropyl) decanoate Chemical compound CCCCCCCCCC(=O)OCC(COC(C)=O)OC(=O)CCCCCCCCC CVVRAHPUFUYWAH-UHFFFAOYSA-N 0.000 description 2
- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 2
- WSYNAKWAAXYNMW-UHFFFAOYSA-N 2,3-Diacetoxypropyl stearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(OC(C)=O)COC(C)=O WSYNAKWAAXYNMW-UHFFFAOYSA-N 0.000 description 2
- CIUYPOUJRYWLDF-UHFFFAOYSA-N 2,3-diacetyloxypropyl hexadecanoate Chemical compound CCCCCCCCCCCCCCCC(=O)OCC(OC(C)=O)COC(C)=O CIUYPOUJRYWLDF-UHFFFAOYSA-N 0.000 description 2
- WPZADTFNTUIQLK-UHFFFAOYSA-N 2,3-diacetyloxypropyl tetradecanoate Chemical compound CCCCCCCCCCCCCC(=O)OCC(OC(C)=O)COC(C)=O WPZADTFNTUIQLK-UHFFFAOYSA-N 0.000 description 2
- KMZHZAAOEWVPSE-UHFFFAOYSA-N 2,3-dihydroxypropyl acetate Chemical compound CC(=O)OCC(O)CO KMZHZAAOEWVPSE-UHFFFAOYSA-N 0.000 description 2
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- OYHQOLUKZRVURQ-HZJYTTRNSA-M 9-cis,12-cis-Octadecadienoate Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC([O-])=O OYHQOLUKZRVURQ-HZJYTTRNSA-M 0.000 description 2
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- 229940126062 Compound A Drugs 0.000 description 2
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- NIQCNGHVCWTJSM-UHFFFAOYSA-N Dimethyl phthalate Chemical compound COC(=O)C1=CC=CC=C1C(=O)OC NIQCNGHVCWTJSM-UHFFFAOYSA-N 0.000 description 2
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- OASMYGNUSRKXSJ-UHFFFAOYSA-N [3-[2,3-di(dodecanoyloxy)propoxy]-2-dodecanoyloxypropyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCC)COCC(OC(=O)CCCCCCCCCCC)COC(=O)CCCCCCCCCCC OASMYGNUSRKXSJ-UHFFFAOYSA-N 0.000 description 2
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- 150000001299 aldehydes Chemical class 0.000 description 2
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- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical group CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
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- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical group CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
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- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 2
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- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical group CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 2
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Classifications
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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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
- B29C41/26—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on a rotating drum
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/365—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
- B29C48/37—Gear pumps
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/793—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling upstream of the plasticising zone, e.g. heating in the hopper
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
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Definitions
- the present invention relates to a cellulose acylate film formed by melt casting.
- the cellulose acylate film of the present invention is useful as an optical film incorporated in a liquid crystal display device.
- a chlorinated organic solvent such as dichloromethane
- a solution casting method for forming a film by drying is mainly carried out.
- Dichloromethane has traditionally been used as a good solvent for cellulose acylate, and has a low boiling point (about 40 ° C), which has the advantage of being easy to dry in the film formation and drying process of the production process. It is preferably used.
- Patent Document 1 JP 2000-352620 A
- An object of the present invention is to provide a melt-formed cellulose acylate film that can largely eliminate display blurring that occurs when incorporated in a liquid crystal display device.
- the normal direction normal elongation at 180 ° C to 240 ° C is 20 ⁇ m to 400 ⁇ m, and the normal direction normal elongation at 180 ° C to 240 ° C is 0.01 N. / cm 2 ⁇ 0. with a melt of 5N / cm 2, characterized in that the melt film [1] to the mounting serial to any force 4 of [4] cellulose ⁇ shea acetate film.
- X represents the substitution degree of the acetyl group
- ⁇ represents the total substitution degree of the propionyl group, butyryl group, pentanoyl group and hexanol group.
- a cellulose acylate film obtained by stretching the cellulose acylate film described in item 4 of [1] to [7] by at least 1% to 300% in at least one direction.
- Formula (6) 500 ⁇ Rth ⁇ 0 [16]
- a polarizing plate comprising at least one layer of the cellulose acylate film according to [1] to [: 15] and a displacement force of [1] laminated on a polarizing layer.
- the cellulose acylate film of the present invention can greatly eliminate display failures (blurring) that occur when incorporated in a liquid crystal display device.
- the inventor has analyzed the cause of display blur that occurs in a conventional liquid crystal display device incorporating a cellulose acylate film. As a result, it has been found that even light with a convexity of 0.1 mm which is shorter than the wavelength of visible light scatters light from the display panel and causes display blur. Such fine irregularities cannot be measured with a haze meter, and are recognized only when an image is displayed. As a result of diligent investigation of the cause of such fine irregularities, the present inventor has adhered to the die lip (die tip) 1 when the melt (molten resin) 2 is extruded from the die, as shown in FIG. However, when this was peeled off, it was clarified that the melt was pulled and the convex part 2b was formed. Furthermore, it was clarified that the convex part 2c was pushed in on the cooling roll, and the periphery of the convex part 2c was pushed in to form the concave part 2d.
- the unevenness that is the subject of the present invention is generated when the melt is pulled by adhesion, and the unevenness is small, and the unevenness is generated by the adhesion between the melt and the die. Occurs over.
- the unevenness that is the subject of the present invention has an opposite expression mechanism to that of a normal die line (occurs by being pulled rather than being pushed in), and the manifestation state is also different (a strong unevenness is not accidentally generated). A weak uneven surface is generated on the entire surface).
- fine irregularities are particularly It occurs remarkably in cellulose acylate.
- fine irregularities are 0 to 10 per 10 cm width, preferably 0 to 8, more preferably 0 to 6.
- a width of 10 cm which is a reference for confirming the number of concave portions and convex portions, is taken in the width direction (TD) at the time of melt film formation.
- Melt film formation is generally carried out continuously industrially, and the film after film formation is usually rolled up and stored. Therefore, when checking the number of recesses and protrusions on a roll-up film, take a length of 10 cm in the width direction of the roll.
- the direction of melt film formation is not clear due to circumstances such as the film being cut, take a width of 10 cm in the direction that maximizes the sum of the number of recesses and the number of protrusions.
- the concave portions and the convex portions are formed along the direction of melt film formation, it is estimated that the direction in which the sum of the number of concave portions and the number of convex portions is maximum is the direction of melt film formation. it can.
- the description of the measuring method described later can be referred to.
- the cellulose acylate film of the present invention which is characterized by a small number of such fine irregularities, can be manufactured by adjusting the melt characteristics and the film forming process as follows, for example. Become. It is preferable to adjust the storage elastic modulus G ′, loss elastic modulus G ′′, tan ⁇ (here, tan ⁇ indicates G ′′ / G ′) of the melt at the die lip. G 'is an index of the elastic strength of the melt, and G "is an index of the viscous strength of the melt. Also, 180 ° C to 240 ° C is the reason why the cellulose acylate is melt-cast. This is the preferred temperature for the die lip. The key is to achieve the following physical properties.
- the G 'force of the melt in C is set to 00 Pa to 30,000 Pa, more preferably 300 Pa to 20,000 Pa, and still more preferably 500 Pa to 10000 Pa.
- the general melt G ′ is about 50 Pa, but by setting it to a high G ′ as described above, the melt sticking to the die lip can be easily pulled and peeled. That is, if the melt is weak below the above range, as shown in FIG. 1, even if the melt sticking to the die lip is pulled to peel off, the melt extends and cannot be peeled off.
- G force in C 000Pa-30000Pa, more preferably 2000Pa-20000Pa, more preferably f 3000Pa ⁇ : 13000Pa.
- G force S, which is the sign of the U.S. occult life term. Easy to do and difficult to peel off. The G 'of the notification melt is about 50000.
- the tan S force in C is -6, more preferably 1.4 to 5, and further preferably 1 ⁇ 7 to 4 ⁇ 5. Since tan ⁇ is a value obtained by dividing the viscosity term by the elastic term, the smaller the value, the larger the elastic term. That is, it is the ratio of the force to stick to the die lip and the force to peel off from the die lip. Therefore, the smaller this is, the easier it is to peel off.
- the present invention is characterized in that tan ⁇ is reduced as described above. Incidentally, tan ⁇ of general melt is about 8.
- Normal elongation at 180 ° C to 240 ° C is 20 ⁇ m to 400 ⁇ m, more preferably 40 ⁇ m to 300 ⁇ m, more preferably 60 ⁇ m to 200 ⁇ m m. This indicates how far the melt stuck to the die lip can be stretched without breaking. The above range indicates that it is difficult to break as shown in Fig. 1 even if the melt attached to the die lip is pulled.
- the stretch rupture length of ordinary melt is about 10 ⁇ m.
- Normal direction tensile rupture stress force at 180 ° C to 240 ° C is 0.01 N / cm 2 to 0.5 N / cm 2, more preferably 0.08 NZcm 2 to 0.4 N / cm 2 , and Preferably, it is 0.1 l / cm 2 to 0.3 N / cm 2 . This makes it difficult for the melt to stretch or break even when the melt is pulled.
- a general melt tensile stress is about 0.005 N / cm 2 .
- the cellulose acylate of the present invention preferably has the composition to be described later from the viewpoint of expression of expression (transparency, transparency), etc., but if the material is used as it is, the above physical properties are not achieved.
- the following materials Can be achieved by including in the cellulose acylate.
- Fatty acids having 2 to 6 carbon atoms are contained in lmelt to 1000ppm, more preferably 2ppm to 500ppm, and further preferably 3ppm to! OOppm melt. Such fatty acids may have a straight chain structure. These fatty acids act in a small amount and can achieve the above physical properties (1) to (3). These fatty acids may be used alone or in combination of two or more. The timing for adding these fatty acids may be before or after the cellulose acylate is formed into pellets.
- These compounds are deposited on the surface of the melt and have an effect of preventing the adhesion between the die lip and the melt, and are effective for the above (4) and (5).
- More preferable examples of compounds include compounds described in JP-A-2001-166144 and JP-A-2002-296421.
- the following compounds in which two aromatic rings are connected by COO can be preferably used.
- These compounds may be used alone or in combination. These compounds have the effect of promoting the expression of optical anisotropy (lettering) in addition to reducing fine irregularities.
- plasticizers for example, phosphoric acid ester compounds, phthalic acid ester compounds, gallic acid ester compounds
- UV absorbers for example, benzophenone compounds and benzotriazole compounds
- the amount of sulfuric acid in the melt is 0 ppm to 200 ppm, more preferably 0 ppm to 100, and even more preferably 0 ppm to 50 ppm.
- Sulfuric acid is added as a catalyst when synthesizing cellulose acylate.
- the main chain of cellulose acylate is cleaved during melt film formation to reduce the molecular weight.
- Such low molecular weight cellulose acylates are not only sticky but also change their viscoelastic properties. Therefore, it is effective for the above (1) to (5), and a synergistic effect can be obtained by using it together with (a) and (i).
- the amount of sulfuric acid in the cellulose acylate can be reduced by stirring sufficiently with hot water of 50 ° C to 100 ° C, which is present at least 1OOOOppm immediately after synthesis. In order to efficiently perform such a cleaning effect, it is effective to reduce the cellulose acylate particle size to 300 mesh or less.
- the cellulose acylate film of the present invention can also be prepared by improving the film forming process as described above. A synergistic effect can be obtained by implementing this together with improvements from the above materials.
- the tip angle of the die lip is 1 ° to 60 °, more preferably 3 ° to 45 °, and still more preferably 5 ° to 30 °. Normally, the die lip angle is 90 °. By making the angle as shown in Fig. 2, sticking between the die lip and the melt can be prevented. If the sharp angle is set, the melt expands. (Since the tip of such a sharp die lip is easily damaged, it is preferable to coat the surface of the die lip with a hard metal. Such hard metal is hard chrome. More preferred are tungsten carbide, titanium, tungsten carbide, and the like. More preferred is tungsten carbide (WC). The ratio (L / R) of CD-to-die lip distance (L) and CD radius (R) shown in Fig.
- the die lip 3 is 0 ⁇ 7 ⁇ :! ⁇ 3, more preferably 0.8 ⁇ :! ⁇ 2, and Preferably 0.9 ⁇ :! ⁇
- Set the die lip to be 1.
- the die lip melt is drawn straight onto the CD. This makes it difficult for the menoleto to come into contact with the die lip, thereby suppressing the occurrence of fine irregularities due to adhesion.
- a die lip is generally installed just above the center of the CD (0 times the radius).
- the gap between the die lip and the CD is widened, so the melt necks in between and further necks in on the CD, reducing the melt width.
- an electrostatic application method in order to reduce neck-in on the CD.
- the electrostatic application method can be applied over the entire width or only part of the width, but it is more efficient and more preferable that it is applied only to both ends.
- a preferable width of electrostatic application is 1 cm to 30 cm at each end, more preferably 2 cm to 20 cm, and still more preferably 3 cm to 15 cm.
- a normal method can be used for the electrostatic application, and a preferable voltage is lkV to 50 kV, more preferably 2 kV to 30 kV, and even more preferably 3 kV to 20 kV. It is preferable that this electrode be placed at a distance of 0.5 cm to 20 cm, more preferably 1 cm to 10 cm from the point where the melt, which is needle-shaped or wire-shaped, contacts the CD.
- the melt discharged from the die is sandwiched between a casting drum and a touch roll and solidified by cooling.
- the fine unevenness formed on the above-described film can be smoothed, and blurring in the liquid crystal display device can be reduced.
- Such a touch roll preferably has elasticity in order to reduce the residual strain generated when the melt discharged from the die is sandwiched between the rolls.
- the outer wall thickness Z is more preferably 0.05 mm to 7. Omm. Is 0.2 mm to 5. Omm. More preferably, it is 0.3 mm to 2. Omm.
- an elastic body layer is provided on a metal shaft or an elastic type, and the outer cylinder is placed on top of the elastic body layer. A liquid medium layer is filled between the active substance layer and the outer cylinder, thereby enabling the formation of a Tachiroll film with an extremely thin outer cylinder.
- Casting rolls and touch rolls preferably have a mirror surface with an arithmetic average height Ra of lOOnm or less, preferably 50 nm or less, and more preferably 25 nm or less.
- Ra an arithmetic average height
- the linear pressure of the preferred tachiroll is 3 kgZcm to: 100 kgZcm, more preferably 5 kg / cm to 80 kg / cm, and even more preferably 7 kg / cm to 60 kg / cm.
- the line pressure and the linear pressure are values obtained by dividing the force applied to the touch roll by the width of the discharge port of the die.
- the linear pressure is 3 ⁇ 4 kg / cm or more, the effect of reducing fine irregularities is easily obtained by pressing the tack roll. If the line pressure is 100 kg / cm or less, it is easy to create a situation in which the touch roll is uniformly touched over the entire casting roll, which makes it easy to reduce distortion.
- the temperature of the touch roll is preferably set to 60 ° C to 160 ° C, more preferably 70 ° C to 150 ° C, and still more preferably 80 ° C to 140 ° C.
- Such temperature control can be achieved by passing a temperature-controlled liquid or gas through these rolls.
- the cellulose acylate of the present invention is preferably a lower fatty acid ester of cellulose.
- Lower fatty acid means a fatty acid having 6 or less carbon atoms. Those esterified with a pionyl group, a butyrate group, a pentanoate group or a hexanoate group are preferred and more preferred. Of these, those esterified with a acetyl group, propionyl group, butyrate group, and pentanoate group are more preferable, and those esterified with a acetyl group, propionyl group, and butyrate group are more preferable. is there.
- These lower fatty acid ester esters of cellulose may be composed of a single type of fatty acid or may be composed of a plurality of fatty acids.
- the cellulose acylate used in the present invention satisfies the following formulas (1) to (3) because fine irregularities can be reduced.
- Y is preferably 0.3 or more.
- X represents the substitution degree of the acetyl group
- ⁇ represents the total substitution degree of the propionyl group, butyryl group, pentanoyl group and hexanol group.
- Equation (5) 0. 1 ⁇ 1.45
- Equation (11) 0. 1 ⁇ 0. 95
- Formula (12) 2. 0 ⁇ 2. 95
- 1/2 of Y is a propionyl group, it is more preferable to satisfy the following formulas (13) to (15).
- Equation (14) 0.5.
- cellulose acylate satisfying the following conditions. That is, when 1/2 or more of ⁇ is a propionyl group, it is preferable to satisfy the following formulas (16) to (: 18).
- Equation (17) 0. 2 ⁇ 0. 75
- propionyl groups other than the acetyl group are more effective than the butyryl group in that propionyl groups can suppress fine unevenness and suppress blurring when incorporated in a liquid crystal display device.
- the degree of substitution of the propionate group is 1.5 or more, more preferably 2.0 or more.
- the degree of polymerization is preferably 250 or less, more preferably 220 or less, and even more preferably 200 or less.
- a typical synthesis method is a liquid phase acetylation method using a carboxylic anhydride monoacetic acid monosulfuric acid catalyst. Specifically, cellulose raw materials such as cotton linter and wood pulp were pretreated with an appropriate amount of acetic acid and then cooled in advance. It is put into a carboxylated mixture and esterified to synthesize a complete cellulose acylate (the total degree of acyl substitution at the 2nd, 3rd and 6th positions is approximately 3.00).
- the carboxylated mixed solution generally contains acetic acid as a solvent, carboxylic anhydride as an esterifying agent, and sulfuric acid as a catalyst.
- Carboxylic anhydride is usually used in a stoichiometric excess over the sum of the cellulose that reacts with it and the water present in the system.
- neutralization agents for example, calcium, magnesium, iron, etc.
- An aqueous solution of aluminum or zinc carbonate, acetate or oxide is added.
- the obtained complete cellulose acylate is saponified and aged by maintaining it at 50 to 90 ° C.
- acetylation reaction catalyst generally, residual sulfuric acid
- cellulose acylate having a degree of polymerization.
- the catalyst remaining in the system is completely neutralized with the neutralizing agent as described above, or water or dilute sulfuric acid without neutralization.
- the cellulose acylate solution is added into the solution (or water or dilute sulfuric acid is added into the cellulose acylate solution) to separate the cellulose acylate, and the cellulose acylate is obtained by washing and stabilizing treatment.
- the degree of polymerization of cellulose acylate preferably used in the present invention is an average degree of polymerization of 100 to 260, preferably 120 to 250, and more preferably 130 to 240.
- the average degree of polymerization can be measured by Uda et al.'S intrinsic viscosity method (Kazuo Uda, Hideo Saito, Journal of Textile Science, 18th No. 1, 105-: 120 pages, 1962). Further details are described in JP-A-9-95538.
- Such adjustment of the degree of polymerization can also be achieved by removing low molecular weight components.
- the average molecular weight (degree of polymerization) increases, but the viscosity is lower than that of normal cellulose acylate, which is useful.
- the removal of low molecular components can be carried out by washing the cellulose acylate with an appropriate organic solvent.
- the molecular weight can be adjusted by a polymerization method. For example, when producing a cellulose silicate having a low molecular component, the amount of sulfuric acid catalyst in the acetylation reaction is preferably adjusted to 0.5 to 25 parts by mass with respect to 100 weight of cellulose.
- the molecular weight distribution Preferred cellulose acylates (with a uniform molecular weight distribution) can be synthesized.
- the cellulose ester used in the present invention preferably has a weight average molecular weight Mw / number average molecular weight Mn ratio of 1.5 to 5.5, particularly preferably 2.0 to 5.0.
- the cellulose ester is preferably 2.5 to 5.0, more preferably 3.0 to 5.0.
- cellulose acylates may be used alone or in combination of two or more.
- a polymer component other than cellulose ester may be appropriately mixed.
- the polymer component to be mixed preferably has a transmittance of 80% or more, more preferably 90% or more, more preferably 92% or more when a film having a good compatibility with the cellulose ester is used. .
- additives for example, plasticizers, ultraviolet ray inhibitors, deterioration inhibitors, fine particles, infrared absorbers, surfactants, etc.
- plasticizers for example, plasticizers, ultraviolet ray inhibitors, deterioration inhibitors, fine particles, infrared absorbers, surfactants, etc.
- Plasticizers can be used those described in, for example, JP 2000- 352620, 0-against cellulose Suashireto: ⁇ 25 mass 0/0, more preferably 1 to 20 mass 0/0, more preferably 3 -: It is preferable to make it contain 15 mass%.
- plasticizer examples include alkyl phthalyl alkyl glycolates, phosphoric acid esters and carboxylic acid esters. , Ethyl phthalyl ethyl dallicolate, propyl phthalyl propyl glycolate, butyl phthalyl butyl dallicolate, octyl phthalyl octyl dallicolate, methyl phthalyl
- Phthalinoremethinore glycolate butinorephthalinoreethinoglycolate, propinorephthalinorebutinoreglycolate, butinorephthalinorepropinoreglycolate, methinolephthalinoreoctinoreglycolate, ethylphthalyl otatilda Examples thereof include lycolate, octyl phthalylmethyl dalicolate, octyl phthalyl ethyl dalicolate and the like.
- phosphate esters include triphenyl phosphate, tricresyl phosphate, Examples thereof include phenyl diphenyl phosphate. Furthermore, it is preferable to use the phosphate ester plasticizer described in claims 3 to 7 of JP-T-6-501040. As described above, phosphate ester has an effect of promoting crystallization of cellulose acylate and generating streaks, but this effect is suppressed by using it together with the low molecular weight compound of the present invention. For this reason, it is also possible to use together with the low molecular weight compound and phosphate ester of this invention.
- Examples of the carboxylic acid ester include phthalic acid esters such as dimethyl phthalate, jetyl phthalate, dibutyl phthalate, dioctyl phthalate, and jetyl hexyl phthalate, List citrate esters such as acetylacetyl butyl acrylate, adipates such as dimethyl adipate, dibutyl adipate, diisobutyl adipate, bis (2-ethylhexyl) adipate, diisodecyl adipate, bis (butyl diglycol adipate), etc. You can.
- butyl oleate, methyl acetyl ricinoleate, dibutyl sebacate, triacetin and the like are preferably used alone or in combination.
- Polyhydric alcohol plasticizers can also be preferably used.
- Polyhydric alcohol plasticizers have good compatibility with cellulose fatty acid esters, and glycerin ester compounds such as glycerin esters and diglycerin esters that exhibit a significant thermoplastic effect, and polyethylene glycols such as polyethylene glycol and polypropylene glycol. Examples include compounds in which an acyl group is bonded to a hydroxyl group of alkylene glycol or polyalkylene glycol.
- these polyhydric alcohol plasticizers also do not reach the above-mentioned “low molecular weight compound”, but prevent adhesion between the melt and the screw, smooth the flow of the melt, and reduce the V streak. It has the effect of suppressing the occurrence.
- Specific glycerin esters include glycerin diacetate stearate, glycerin diacetate palmitate, glycerin diacetate myristate, glycerin diacetate laurate, glycerin diacetate force plate, glycerin diacetate nonanate, daridine serine diacetate Otanoate, glycerol diacetate heptanoate, glycerol diacetate hexanoate, glycerol diacetate pentanoate, glycerol acetate dicaprate, glycerol acetate dicaprate, glycerol acetate dinonate, glycerol acetate dioctanoate, Glycerin acetate diheptanoate, glycerin Acetate dicaproate, glycerol acetate divalerate, glycerol acetate dibutyrate, glycerol dipropionate
- glycerol diacetate caprylate glycerol diacetate peranolate
- glycerol diacetate force plate glycerol diacetate laurate
- glycerol diacetate myristate glycerol diacetate palmitate
- glycerol diacetate stearate glycerol diester Acetate is preferred.
- diglycerin esters include diglycerin tetraacetate, diglycerin glycerin tetrahexanoate, diglycerin tetraheptanoate, diglycerin tetra force prelate, diglycerin tetrapelargonate, diglycerin tetra force plate, diglycerin tetra Laurate, diglycerin tetramyristate, diglycerin tetrapalmitate, diglycerin triacetate propionate, diglycerin triacetate butyrate, diglycerin triacetate valerate, diglycerin triacetate hexanoate, diglycerin triacetate heptanoate, diglycerin Triacetate caprylate, diglycerin triacetate pera / legonate, diglycerin triacetate force plate, Glycerin triacetate laurate, diglycerin triacetate myristate, diglycerin triacetate palm
- diglycerin tetraacetate, diglycerin tetrapropionate, diglycerin tetrapropylate, diglycerin tetracaprylate, and diglycerin tetralaurate are preferred.
- polyalkylene glycol examples include, but are not limited to, polyethylene glycol and polypropylene glycol having an average molecular weight of 200 to 1000, and these can be used alone or in combination.
- Specific examples of the compound in which the acyl group is bonded to the hydroxyl group of polyalkylene glycol include polyoxyethylene acetate, polyoxyethylene propionate, polyoxyethylene butyrate, polyoxyethylene valerate, polyoxyethylene strength proate, polyoxyethylene Lioxyethylene heptanoate, polyoxyethylene otanoate, polyoxyethylene nonanate, polyoxyethylene force plate, polyoxyethylene laurate, polyoxyethylene myristate, polyoxyethylene palmitate, polyoxyethylene stearate, polyoxy Ethyleneolate, polyoxyethylene linoleate, polyoxypropylene acetate, polyoxypropylene propionate, polyoxypropylene butyrate, polyoxypropyl Pyrene valerate, polyoxypropylene force Puroeto, polyoxypropylene alkylene heptanoate, polyoxypropylene OTA Tano benzoate, polyoxypropylene nona ne over preparative, polyoxypropylene force plate, polyoxypropylene la
- the infrared absorbing dye for example, those disclosed in JP-A-2001-194522 can be used, and as the infrared absorber, those described in, for example, JP-A-2001-151901 can be used. Les, Shi preferred is 0.001 to 5 mass 0/0 be contained relative rate. For the fine particles, it is preferable to use metal oxides with an average particle size of 5 to 3000 nm or those with a crosslinking polymer strength. % Content is preferable.
- the deterioration inhibitor is preferably contained in an amount of from 0.000 to 2% by mass based on cellulose acylate.
- epoxy compounds, weak organic acids, phosphites, thiophosphate compounds, phosphites for example, JP-A-51-70316, JP-A-Hei. 10-306175, JP-A-57-78431, JP-A-54-157159, JP-A-55-13765, and phosphite compounds (JP-A-2004-182979) Can be used. These may be used alone or in admixture of two or more.
- Cellulose ⁇ Shi rates magnitude of preferred instrument preferably pellets to pelletizing 1 mm 3 ⁇ : a 10 cm 3, more preferably 5 mm 3 to 5 cm 3, more preferably from 10mm 3 ⁇ 3cm 3. At this time, it is preferable that the above additives are also pelleted together. Then, it is dried so that the water content is 0.1% or less.
- the dried pellets are charged into a hopper of a melt extruder.
- the hopper is set to Tg — 50 ° C. to Tg + 30 ° C., more preferably Tg—40 ° C. to Tg + 10 ° C., and further preferably Tg—30 ° C. to Tg.
- Tg 50 ° C. to Tg + 30 ° C.
- the cellulose acylate is kneaded at the melting temperature described above using the screw having the compression ratio described above.
- the melting temperature may be controlled at a constant temperature, or it may be divided and controlled. More preferably, the temperature on the upstream side (hopper side) is 1 ° C to 50 ° C, more preferably 2 ° C to 30 ° C, still more preferably 3 ° C to 20 ° C from the temperature on the downstream side (T-die side)
- a higher temperature is preferable because decomposition of cellulose acylate can be further suppressed. That is, in order to promote melting, the temperature of the upstream part supporting this is raised to a higher temperature, and after melting, the temperature is lowered to suppress decomposition.
- the kneading time is preferably 2 minutes to 60 minutes, more preferably 3 minutes to 40 minutes, and further preferably 4 minutes to 30 minutes.
- the preferred average temperature in the melt extruder ((temperature of each zone in the melt extruder) X (the residence time in each zone divided by the total residence time)) is 170. C-230. C power preference ⁇ , more preferred ⁇ f or 180. C ⁇ 220. C, even better ⁇ ma 190. C to 215 ° C. It is also preferable to carry out the inside of the melt extruder in an inert (nitrogen, etc.) stream.
- the temperature of the die is set so that the melt has the above-mentioned physical property values.
- Extrusion is performed using a die as described above.
- the preferable die lip interval is preferably 1 to 10 times the film thickness of the film to be formed, more preferably 2 to 8 times, and even more preferably 3 to 7 times.
- the thick sheet extruded from the die lip is adjusted to the desired thickness by adjusting the peripheral speed of the CD.
- the preferred temperature of the die lip is 180 ° C to 250 ° C, more preferably 190 ° C to 240 ° C, and even more preferably 200. C-230. C.
- Extrusion may be performed in a single layer, or multiple layers may be extruded using a multi-hold die or field block die.
- the film forming width is 0.5 m to 5 m, more preferably 0.7 m to 4 m, and further preferably lm to 3 m.
- the trimmed part is either crushed or reprocessed as a raw material for film of the same type or as a raw material for film of a different type after being subjected to processing such as granulation, depolymerization and repolymerization as necessary. You can use it.
- Elastic modulus of the cellulose ⁇ shea rate thus obtained is 1. 5kNZmm 2 ⁇ 2. More preferably 9 kN / mm 2 is preferred instrument 1. 7kNZmm 2 ⁇ 2. 8kN / mm 2, more preferably 1.8 kN / mm 2 ⁇ 2. it is a 6kN / mm 2.
- Tg (which refers to the Tg of the film, ie, the Tg of the mixture of cellulose acylate and additive) is preferably 95 ° C to 145 ° C, more preferably 100 ° C to 140 ° C, and even more preferably 105 ° C. C to 135 ° C.
- the thickness thus obtained is preferably 50 ⁇ m to 250 ⁇ m, more preferably 70 ⁇ m to 200 ⁇ m, and still more preferably 90 ⁇ m to 180 ⁇ m.
- the stretching is preferably performed at Tg to Tg + 50 ° C, more preferably Tg + 3 ° C to Tg + 30 ° C, and further preferably Tg + 5 ° C to Tg + 20 ° C.
- a preferred draw ratio is 10% to 300%, more preferably 15% to 200%, and even more preferably 20% to 150% on at least one side. These stretching operations may be performed in one stage or in multiple stages.
- the stretching ratio is obtained using the following formula.
- Stretch ratio (%) 100 X ⁇ (Length after stretching)-(Length before stretching) ⁇ / Length before stretching
- the film may be stretched in the longitudinal direction (longitudinal stretching), or both ends of the film may be held by a chuck and spread in the orthogonal direction (perpendicular to the longitudinal direction) (lateral stretching).
- the simultaneous biaxial stretching method described in JP-A No. 2000-37772, JP-A No. 2001-113591 and JP-A No. 2002-103445 is used. It may be used.
- the ratio of Re and Rth can be freely controlled by controlling the value (aspect ratio) obtained by dividing the space between nip rolls by the film width in the case of longitudinal stretching.
- the RthZRe ratio can be increased by reducing the aspect ratio.
- transverse stretching it can be controlled by stretching in the orthogonal direction and simultaneously stretching in the longitudinal direction, or conversely relaxing. That is, the Rth / Re ratio can be increased by stretching in the vertical direction, and the Rth / Re ratio can be decreased by relaxing in the vertical direction.
- the difference between the stretching ratios in the longitudinal and lateral directions is preferably 10% to 100%, more preferably 20% to 80%, and further preferably 25% to 60%, and it is more preferable that the stretching is performed asymmetrically in the longitudinal and lateral directions. At this time, it is more preferable to increase the stretching ratio in the transverse direction.
- the stretching speed is preferably 10% / min to 10000% / min, more preferably 20% / min to 1000% / min, and even more preferably 30% / min to 800% / min.
- Re and Rth of the cellulose acylate film after stretching preferably satisfy the following formulas (a) to (c).
- Re and Rth satisfy the following formulas (d) to (f).
- Re and Rth satisfy the following formulas (g) to (i).
- Re letter decision value and Rth letter decision value are as follows: It shall be calculated based on Re (E) and Rth (E) represent the in-plane retardation and thickness-wise letter decisions at wavelength ⁇ , respectively.
- Re (E) is measured with KOBRA 21A DH (manufactured by Oji Scientific Instruments Co., Ltd.) by injecting light of wavelength nm in the normal direction of the film.
- Rth ( ⁇ ) is Re ( ⁇ )
- the slow axis (determined by KOBRA 21ADH) is used as the tilt axis (rotation axis).
- Letter retardation value measured by incidence, and letter retardation measured by impinging light of I nm with a wavelength from a direction inclined by 140 ° with respect to the film normal direction with the in-plane slow axis as the tilt axis Values are calculated by KOBRA 21ADH based on letter decision values measured in three directions. At this time, it is necessary to input the assumed value of the average refractive index and the film thickness. KOBRA 21ADH also calculates nx, ny, and nz in addition to Rth ( ⁇ ). The average refractive index is 1.48 for cellulose acetate.
- the values of polymer films for typical optical applications other than cellulose acetate include cycloolefin polymer (1.52), polycarbonate (1.59), Values such as polymethylol methacrylate (1.49) and polystyrene (1.59) can be used.
- the polymer handbook JOHN WILEY & SONS, INC
- the polymer film catalog values can be used.
- ⁇ refers to 550 ⁇ 5 nm or 590 ⁇ 5 nm unless otherwise specified.
- the angle ⁇ formed by the film forming direction (longitudinal direction) and the slow axis of Re of the film is preferably closer to 0 °, + 90 ° or ⁇ 90 °. That is, in the case of longitudinal stretching, the closer to 0 °, the more preferable 0 ⁇ 3 ° is more preferable, 0 ⁇ 2 ° is more preferable, and 0 ⁇ 1 ° is still more preferable.
- 90 ⁇ 3 ° or 1 90 ⁇ 3 ° is preferred, more preferably 90 ⁇ 2 ° or _ 90 ⁇ 2 °, more preferably 90 ⁇ 1 ° or 1 90 ⁇ 1 ° It is.
- the thickness of the cellulose acylate film after stretching is preferably 15 m to 200 ⁇ m, more preferably 30 ⁇ m to 170 ⁇ m, and even more preferably 40 ⁇ m to 140 ⁇ m.
- Thickness unevenness is preferably 0% to 2% in both the thickness direction and the width direction, both unstretched and after stretching, more preferably 0% to 1.5%, and even more preferably 0% to 1%.
- the elastic modulus of the cellulose acylate thus obtained is 1.5 kNZmm 2 ⁇ 2.9 kN / m more preferably m 2 is preferred instrument 1. 7kN / mm 2 ⁇ 2. 8kN / mm 2, more preferably 1 ⁇ 8 kN / mm 2 ⁇ 2 . 6kN / mm 2.
- Tg (which refers to the Tg of the film, ie, the Tg of the mixture of cellulose acylate and additive) is preferably 95 ° C to 145 ° C, more preferably 100 ° C to 140 ° C, and even more preferably 105 ° C. C to 135 ° C.
- the thickness after stretching is 30! ⁇ 200 zm is preferred, preferably 40 ⁇ 111 to 150 ⁇ 111, more preferably 50 ⁇ 111 to 100 ⁇ 111.
- These unstretched and stretched cellulose acylate films may be used alone or in combination with a polarizing plate, and a liquid crystal layer or a layer with a controlled refractive index (low A reflective layer) or a hard coat layer may be provided.
- the cellulose acylate film can achieve an improved adhesion between the cellulose silicate film and each functional layer (for example, the undercoat layer and the back layer) by optionally performing a surface treatment.
- a surface treatment for example, glow discharge treatment, ultraviolet irradiation treatment, corona treatment, flame treatment, acid or alkali treatment can be used.
- glow one discharge treatment A, 1 0- 3 to 20 Torr at Yogu furthermore atmospheric pressure even at a low temperature plasma generated in a low-pressure gas in the plasma treatment is also preferable les.
- a plasma-excitable gas is a gas that is plasma-excited under the above conditions, and is a fluorocarbon such as argon, helium, neon, krypton, xenon, nitrogen, carbon dioxide, and tetrafluoromethane. And mixtures thereof. Details of these are described in detail on pages 30 to 32 in the Japan Society for Invention and Innovation Technical Report (Public Technical Number 2001-1745, published on March 15, 2001, Japan Institute of Invention and Innovation). Note that plasma treatment at atmospheric pressure, which has been attracting attention in recent years, uses, for example, 10 to: 20 to 500 Kgy of irradiation energy under OOOKev, more preferably 20 to 300 Kgy of irradiation energy under 30 to 500 Kev. It is done. Among these, an alkali hatching treatment is particularly preferable, and it is extremely effective as a surface treatment of a cellulose acylate film.
- a fluorocarbon such as argon, helium, neon, krypton,
- a suitable hatching solution may be applied by immersion in the incubation solution.
- an aqueous solution with a pH of 10 to 14 such as NaOH or KOH20. C-80. This can be achieved by passing through a bath heated to C for 0.1 to 10 minutes, followed by neutralization, washing with water and drying.
- the solvent of the alkali hatching treatment solution is good for wettability because it is applied to the transparent support of the hatching solution, and the hatching solution solvent does not form irregularities on the surface of the transparent support, so that it is planar. It is preferable to select a solvent that keeps the good. Specifically, isopropyl alcohol is preferred because alcohol-based solvents are preferred. An aqueous solution of a surfactant can also be used as a solvent.
- the alkali of the alkali hatching coating solution is soluble in the above solvent. Alkali is preferred. KOH and NaOH are more preferred.
- the pH of the hatching coating solution is preferably 10 or more, more preferably 12 or more.
- the reaction conditions during alkali hatching are preferably 1 second to 5 minutes at room temperature, more preferably 5 seconds to 5 minutes, and even more preferably 20 seconds to 3 minutes.
- After the alkali hatching reaction it is preferable to wash the surface to which the hatching solution is applied with water or with an acid and then with water.
- the coating-type hatching process and the alignment film uncoating described later can be performed continuously, and the number of processes can be reduced. Specific examples of these hatching methods are described in JP 2002-82226 A and International Publication WO 02/46809.
- an undercoat layer for adhesion to the functional layer is also preferable to provide an undercoat layer for adhesion to the functional layer.
- This layer can be applied without any surface treatment after the above surface treatment. Details of the undercoat layer are described on page 32 of the Japan Society for Invention and Innovation (Public Technical Number 2001-1745, published on March 15, 2001, Japan Institute of Invention and Innovation).
- polarizing layers use stretched polymer, iodine in the bath or dichroic dye. In general, it is prepared by immersing in a solution of the above and allowing iodine or a dichroic dye to penetrate into the binder.
- a coating type polarizing film represented by Optiva Inc. can also be used. Iodine and dichroic dye in the polarizing film exhibit deflection performance by being oriented in the binder.
- the dichroic dye an azo dye, a stilbene dye, a pyrazolone dye, a triphenylmethane dye, a quinoline dye, an oxazine dye, a thiazine dye or an anthraquinone dye is used.
- the dichroic dye is preferably water-soluble.
- the dichroic dye preferably has a hydrophilic substituent (eg, sulfo, amino-containing hydroxyl).
- a hydrophilic substituent eg, sulfo, amino-containing hydroxyl
- the binder of the polarizing film either a polymer that can be crosslinked by itself or a polymer that is crosslinked by a crosslinking agent can be used, and a plurality of combinations thereof can be used.
- the binder include a metatalylate copolymer, a styrene copolymer, polyolefin, polyvinyl alcohol and modified polyvinyl alcohol, poly (N-methylolacrylamide) described in paragraph No. [0022] of JP-A-8-338913. ), Polyester, polyimide, vinyl acetate copolymer, carboxymethyl cellulose, polycarbonate and the like. Silane coupling agents can be used as the polymer.
- Water-soluble polymers eg, poly (N-methylol acrylamide), carboxymethyl cellulose, gelatin, polyvinyl alcohol, and modified polyvinyl alcohol
- Gelatin, polybulu alcohol, and modified polybum alcohol are more preferred.
- Polyvinyl alcohol and modified polyvinyl alcohol are most preferred. It is particularly preferable to use two types of polyvinyl alcohol or modified polybutyl alcohol with different degrees of polymerization.
- the hatchability of polybulal alcohol is 70 to 100% strength, preferably 80 to 100% strength.
- the degree of polymerization of polybulal alcohol is preferably 100-5000.
- the lower limit of the binder thickness is preferably 10 xm.
- the upper limit of the thickness is preferably as thin as possible from the viewpoint of light leakage of the liquid crystal display device.
- Commercially available polarizing plate (approx. 30 zm) It is preferable that the following is 25 ⁇ or less force S, preferably 20 / im or less.
- the binder of the polarizing film may be cross-linked.
- a polymer having a crosslinkable functional group or a monomer may be mixed in the binder.
- the binder polymer itself may be provided with a crosslinkable functional group.
- Crosslinking can be performed by light, heat, or pH change, and a binder having a crosslinked structure can be formed.
- the crosslinking agent is described in U.S. Reissue Pat.
- Boron compounds eg, boric acid, borax
- the addition amount of the crosslinking agent for the binder is preferably 0.:! To 20% by mass with respect to the binder. The orientation of the polarizing element and the moisture and heat resistance of the polarizing film are improved.
- the amount of the unreacted crosslinking agent is preferably 1.0% by mass or less, and more preferably 0.5% by mass or less. By doing so, the weather resistance is improved.
- the polarizing film is preferably dyed with iodine or a dichroic dye after the force for stretching the polarizing film (stretching method) or rubbing (rubbing method).
- the stretching ratio is preferably 2.5 to 30.0 times, more preferably 3.0 to 10.0 times. Stretching can be performed by dry stretching in air. In addition, wet stretching may be performed while immersed in water. The draw ratio of dry stretching is preferably 2.5 to 5.0 times, and the draw ratio of wet drawing is preferably 3.0 to 10.0 times. Stretching may be performed in parallel to the MD direction (parallel stretching), and even if performed in an oblique direction, it is good (oblique stretching) 1 The former is more preferred. These stretching operations may be performed once or divided into several times. By dividing into several times, it is possible to stretch more uniformly even at high magnification.
- the PVA film Prior to stretching, the PVA film is swollen. The degree of swelling is 1.2 to 2.0 times (weight ratio before and after swelling). Thereafter, the film is stretched at a bath temperature of 15 to 50 ° C., particularly 17 to 40 ° C. in an aqueous medium bath or a dye bath for dissolving a dichroic substance while being continuously conveyed through a guide roll or the like. Stretching can be achieved by gripping with two pairs of nip rolls and increasing the conveyance speed of the subsequent nip roll to be higher than that of the previous nip roll.
- the draw ratio is based on the length ratio of the initial Z state after drawing (hereinafter the same), but the draw ratio is preferably 1.2 to 3.5 times, especially 1.5 to 3 in view of the above-mentioned effects. 0 times. Thereafter, it is dried at 50 ° C. to 90 ° C. to obtain a polarizing film.
- a method of stretching using a tenter projecting in a slanting direction as described in JP-A-2002-86554 can be used. Since this stretching is performed in the air, it is necessary to make it easy to stretch by adding water in advance.
- the water content is preferably 5% to 100%, more preferably 10% to 100%.
- the temperature during stretching is preferably 40 ° C to 90 ° C, more preferably 50 ° C to 80 ° C.
- the relative humidity is preferably 50% to 100%, more preferably 70% to 100%, and still more preferably 80% to 100%.
- the traveling speed in the longitudinal direction is preferably lm / min or more, more preferably 3 mZ min or more.
- the film is dried at 50 ° C. to 100 ° C., more preferably 60 ° C. to 90 ° C., for 0.5 to 10 minutes. More preferably, it is 1 minute to 5 minutes.
- the absorption axis of the polarizing film thus obtained is preferably 10 to 80 degrees, more preferably 30 to 60 degrees, and even more preferably substantially 45 degrees (40 to 50 degrees). is there.
- the cellulose acylate film after hatching and the polarizing layer prepared by stretching are bonded to prepare a polarizing plate.
- the laminating direction is preferably performed so that the casting axis direction of the cellulose acylate film and the stretching axis direction of the polarizing plate are 45 degrees.
- PVA resins including modified PVA such as acetoacetyl group, sulfonic acid group, carboxyl group, oxyalkylene group, etc.), boron compound aqueous solution, etc.
- PVA resin is preferable.
- the thickness of the adhesive layer after drying is 0.01-: 10 zm force S, preferably 0.05-5 ⁇ force S, particularly preferred, 0
- the polarizing plate thus obtained preferably has a high light transmittance and preferably has a high degree of polarization.
- the transmittance of the polarizing plate should be in the range of 30 to 50% for light having a wavelength of 550 nm. S is preferable, and the range of 35 to 50% is more preferable, and the range of 40 to 50% is more preferable. Most preferred.
- the degree of polarization is preferably in the range of 90 to 100% for light having a wavelength of 550 nm. It is preferably in the range of 99 to 100%, more preferably in the range of 95 to 100%. Most preferred.
- the polarizing plate thus obtained can be laminated with a ⁇ / 4 plate to produce circularly polarized light.
- ⁇ / 4 is not particularly limited, but more preferably, the lower the wavelength, the smaller the letter distortion.
- polarizing film having an absorption axis inclined by 20 ° to 70 ° with respect to the longitudinal direction, and a ⁇ / 4 plate made of an optically anisotropic layer made of a liquid crystalline compound.
- the optically anisotropic layer is used to compensate for the liquid crystal compound in the liquid crystal cell in the black display of the liquid crystal display device.
- An optically anisotropic layer is formed on the cellulose acylate film by forming an alignment film. It is formed by applying a layer.
- An alignment film is provided on the surface-treated cellulose acylate film.
- This film has a function of defining the orientation direction of liquid crystalline molecules.
- the alignment film plays the role, so it is not necessarily an essential component of the present invention. That is, it is possible to produce the polarizing plate of the present invention by transferring only the optically anisotropic layer on the alignment film in which the alignment state is fixed onto the polarizer.
- the alignment film is formed by rubbing an organic compound (preferably a polymer), oblique vapor deposition of an inorganic compound, forming a layer having a micro-gnoleve, or an organic compound (eg, ⁇ -) by the Langmuir 'Projet method (LB film). Tricosanoic acid, dioctadecylmethylammonium chloride, methyl stearylate). Furthermore, an alignment film in which an alignment function is generated by application of an electric field, application of a magnetic field, or light irradiation is also known. The alignment film is preferably formed by polymer rubbing treatment. In principle, the polymer used for the alignment film has a molecular structure having a function of aligning liquid crystal molecules.
- the side chain having a crosslinkable functional group (eg, double bond) is bonded to the main chain, or the function of aligning liquid crystal molecules is provided. It is preferable to introduce a crosslinkable functional group into the side chain.
- a polymer that can be crosslinked by itself or a polymer that is crosslinked by a crosslinking agent can be used, and a combination of these can be used. S can.
- polymer examples include, for example, a metatalylate copolymer, a styrene copolymer, a polyolefin, a polybutanol, a modified polybulualcohol, a poly (poly (alcohol) described in JP-A-8-338913, paragraph No. [0022].
- N-methylol acrylamide polyesters, polyimides, butyl acetate copolymers, carboxymethyl styrene and polycarbonate.
- Silane coupling agents can be used as the polymer.
- Water-soluble polymers eg, poly (N-methylolacrylamide), carboxymethylcellulose, gelatin, polybulal alcohol, and modified polyvinyl alcohol are preferred.
- Polybulal alcohol has a hatching degree of 70 to 100% strength S, more preferably 80 to 100%. Polyvinyl alcohol has a polymerization degree of 100 to 5,000.
- Side chains having the function of aligning liquid crystalline molecules generally have a hydrophobic group as a functional group.
- the specific type of functional group is determined according to the type of liquid crystal molecules and the required alignment state.
- the modifying group of the modified polyvinyl alcohol can be introduced by copolymerization modification, chain transfer modification or block polymerization modification.
- modifying groups include hydrophilic groups (carboxylic acid groups, sulfonic acid groups, phosphonic acid groups, amino groups, ammonium groups, amide groups, thiol groups, etc.), hydrocarbon groups having 10 to 100 carbon atoms, fluorine atoms
- examples include substituted hydrocarbon groups, thioether groups, polymerizable groups (unsaturated polymerizable groups, epoxy groups, azirinidyl groups, etc.), alkoxysilanol groups (trialkoxy, dialkoxy, monoalkoxy), and the like.
- Specific examples of these modified polybutyl alcohol compounds include, for example, paragraph numbers [0022] to [0145] in JP-A 2000-155216 and paragraph numbers [0018] in 2002-62426. To those described in [0022].
- a crosslinkable functional group is introduced into the side chain having the function of orienting the crystalline molecule
- the polymer of the alignment film and the polyfunctional monomer contained in the optically anisotropic layer can be copolymerized.
- the strength of the optical compensation sheet can be remarkably improved by introducing the crosslinkable functional group into the alignment film polymer.
- the crosslinkable functional group of the alignment film polymer preferably contains a polymerizable group in the same manner as the polyfunctional monomer. Specific examples include those described in paragraphs [0080] to [0100] of JP-A No. 2000-155216.
- the alignment film polymer can also be crosslinked using a crosslinking agent.
- crosslinking agent examples include aldehyde, N-methylol compounds, dioxane derivatives, compounds that act by activating carboxy groups, active vinyl compounds, active halogen compounds, isoxazole and dialdehyde starch. You can use two or more types of crosslinking agents together. Specific examples include compounds described in paragraphs [0023] to [024] in JP-A-2002-62426. Aldehydes with high reaction activity, especially daltaraldehyde, are preferred.
- the addition amount of the crosslinking agent is preferably from 0.5 to 20% by mass relative to the polymer, more preferably from 0.5 to 15% by mass.
- the amount of the unreacted crosslinking agent remaining in the alignment film is preferably 1.0% by mass or less, and more preferably 0.5% by mass or less.
- the alignment film can be basically formed by applying the polymer on the transparent support containing the alignment film forming material and the crosslinking agent, followed by heat drying (crosslinking) and rubbing treatment. As described above, the crosslinking reaction may be performed at an arbitrary time after coating on the transparent support.
- the coating solution is preferably a mixed solvent of an organic solvent (eg, methanol) having a defoaming action and water.
- the weight ratio of water: methanol is preferably 0: 100 to 99: 1. It is more preferable that the ratio is 0: 100 to 91: 9. As a result, the generation of bubbles is suppressed, and defects on the alignment film and further on the surface of the optically anisotropic layer are remarkably reduced.
- the method for applying the alignment film is preferably a spin coating method, a dip coating method, a curtain coating method, an etching coating method, a rod coating method or a roll coating method.
- a rod coating method is particularly preferable.
- the film thickness after drying is preferably 0.1 to: lO x m. Heating and drying can be performed at 20 ° C to 110 ° C. In order to form sufficient crosslinks, 60 ° C to 100 ° C is preferable, and 80 ° C to 100 ° C is particularly preferable.
- the drying time is a force that can be carried out in 1 minute to 36 hours, preferably 1 minute to 30 minutes. When dartal aldehyde, which is preferably set to an optimum value for the crosslinking agent to be used, is used, pH is 4.5 to 5.5, and 5 is particularly preferable.
- the alignment film is provided on the transparent support or the undercoat layer.
- the alignment film can be obtained by rubbing the surface after crosslinking the polymer layer as described above.
- the rubbing treatment is widely adopted as a liquid crystal alignment treatment process of LCD, and can be applied. That is, a method of obtaining the orientation by rubbing the surface of the orientation film in a certain direction using paper, gauze, felt, rubber, nylon, polyester fiber or the like can be used. Generally, it is carried out by rubbing several times using a cloth in which fibers having a uniform length and thickness are averagely planted.
- this is achieved by bringing a rotating rubbing roll into contact with the film with the polarizing layer being transported.
- the roundness, cylindricity, and runout (eccentricity) of the labinda roll can be reduced. Is preferably 30 ⁇ m or less.
- the wrap angle of the film on the labinda roll is preferably 0.:! To 90 °.
- a stable rubbing treatment can be obtained by winding 360 ° or more.
- the film transport speed is preferably l-100mZmin. It is preferable to select an appropriate rubbing angle in the range of 0 to 60 °. When used in a liquid crystal display device, the angle is preferably 40 to 50 °. 45 ° is particularly preferred.
- the thickness of the alignment film thus obtained is preferably in the range of 0.1 to: lO x m.
- the liquid crystalline molecules of the optically anisotropic layer are aligned on the alignment film. Thereafter, if necessary, the alignment film polymer and the polyfunctional monomer contained in the optically anisotropic layer are reacted, or Alternatively, the alignment film polymer is crosslinked using a crosslinking agent.
- the liquid crystalline molecules used in the optically anisotropic layer include rod-like liquid crystalline molecules and discotic liquid crystalline molecules.
- the rod-like liquid crystal molecule and the disc-like liquid crystal molecule may be a polymer liquid crystal or a low molecular liquid crystal, and further include those in which a low molecular liquid crystal is cross-linked and does not exhibit liquid crystallinity.
- rod-like liquid crystalline molecules examples include azomethines, azoxys, cyanobiphenyls, cyanophyl phenyl esters, benzoic acid esters, cyclohexane carboxylic acid phenyl esters, cyanphenyl cyclohexanes, cyano-substituted phenyl pyrimidines, alkoxy Substituted phenylpyrimidines, phenyldioxanes, tolanes and alkenylcyclohexylbenzonitriles are preferably used.
- the rod-like liquid crystalline molecule includes a metal complex.
- a liquid crystal polymer in which rod-like liquid crystalline molecules are repeatedly contained in a unit can also be used as the rod-like liquid crystalline molecules.
- the rod-like liquid crystal molecule may be bonded to a (liquid crystal) polymer.
- the birefringence of the rod-like liquid crystal molecule is preferably in the range of 0.001 -0.7.
- the rod-like liquid crystal molecule preferably has a polymerizable group in order to fix its alignment state.
- the polymerizable group is preferably a radically polymerizable unsaturated group or a cationically polymerizable group. Specifically, for example, the polymerization described in paragraphs [0064] to [0086] of JP-A-2002-62427 is described. And a polymerizable liquid crystal compound.
- Discotic liquid crystal molecules include C. Destrade et al., Benzene derivatives described in Mol. Cry st. 71 ⁇ , p. 111 (1981), C. Destrade et al. Molx Cry st. 122, 141 (1985), Physics lett, A, 78, 82 (1990), a research report by B. Kohne et al., Angew. Cyclohexane derivatives and JM Lehn described on page 96, page 70 (1984) J. Chem. Commun., 1794 (1985), J. Zhang et al., J. Am. Chem. Soc. 116 ⁇ , 2655 (1994).
- the ruzacrown discotic liquid crystalline molecule has a structure in which a linear alkyl group, an alkoxy group, and a substituted benzoyloxy group are radially substituted as a side chain of the mother nucleus with respect to the mother nucleus at the center of the molecule.
- a compound exhibiting liquid crystallinity is also included.
- the molecule or the assembly of molecules is preferably a compound having rotational symmetry and capable of imparting a certain orientation.
- the optically anisotropic layer formed from discotic liquid crystalline molecules does not necessarily require that the compound finally contained in the optically anisotropic layer is a discotic liquid crystalline molecule.
- discotic liquid crystalline molecules are described in JP-A-8-50206.
- the polymerization of discotic liquid crystalline molecules is described in JP-A-8-27284.
- the discotic core and the polymerizable group are preferably a compound that is bonded via a linking group, whereby the orientation state can be maintained in the polymerization reaction. Examples thereof include compounds described in JP-A 2000-155216, paragraphs [015 1] to “0168”.
- the angle force between the long axis (disk surface) of the discotic liquid crystalline molecules and the surface of the polarizing film increases or decreases in the depth direction of the optically anisotropic layer and with increasing distance from the surface of the polarizing film. is doing.
- the angle preferably decreases with increasing distance.
- the angle change can be continuous increase, continuous decrease, intermittent increase, intermittent decrease, change including continuous increase and continuous decrease, or intermittent change including increase and decrease.
- the intermittent change includes a region where the inclination angle does not change in the middle of the thickness direction. The angle should increase or decrease as a whole, even if it includes areas where the angle does not change. Furthermore, it is preferable that the angle changes continuously.
- the average direction of the long axis of the discotic liquid crystalline molecules on the polarizing film side is generally determined by selecting the discotic liquid crystalline molecules or the material of the alignment film, or selecting the rubbing treatment method.
- the adjustment power S can be achieved.
- the major axis (disk surface) direction of the disk-like liquid crystalline molecules on the surface side (air side) is generally adjusted by selecting the kind of additive used together with the disk-like liquid crystalline molecules or the disk-like liquid crystalline molecules. be able to.
- the additive used together with the discotic liquid crystalline molecule include a plasticizer, a surfactant, a polymerizable monomer, and a polymer.
- the degree of change in the orientation direction of the long axis can be adjusted by selecting the liquid crystalline molecule and the additive as described above.
- the uniformity of the coating film, the strength of the film, the orientation of the liquid crystal molecules, and the like can be improved. It is preferable that the liquid crystal molecules have compatibility with the liquid crystal molecules and do not inhibit the force or orientation that can change the tilt angle of the liquid crystal molecules.
- the polymerizable monomer examples include radically polymerizable or cationically polymerizable compounds.
- it is a polyfunctional radically polymerizable monomer and is preferably copolymerizable with the above-mentioned polymerizable group-containing liquid crystal compound. Examples thereof include those described in paragraph Nos. [0018] to [0020] in the specification of JP-A-2002-296423.
- the amount of the above compound added is generally in the range of 1 to 50% by mass and preferably in the range of 5 to 30% by mass with respect to the discotic liquid crystalline molecules.
- surfactant examples include conventionally known compounds, and fluorine compounds are particularly preferred. Specific examples include compounds described in paragraph numbers [0028] to [0056] in JP-A-2001-330725.
- the polymer used with the discotic liquid crystalline molecules is preferably capable of changing the tilt angle of the discotic liquid crystalline molecules.
- a cellulose ester can be mentioned as an example of a polymer.
- Preferable examples of the cellulose ester include those described in paragraph No. [0178] of JP-A-2000-155216.
- the addition amount of the polymer is preferably in the range of 0.1 to 10% by mass with respect to the liquid crystal molecule so as not to disturb the alignment of the liquid crystal molecule.
- Discotic nematic liquid crystal phase-solid phase transition temperature of discotic liquid crystalline molecules is 70 ⁇ 300 ° C force S is preferable, 70-: 170 ° C is more preferable.
- the optically anisotropic layer can be formed by applying a coating liquid containing liquid crystalline molecules and, if necessary, a polymerization initiator described later and optional components on the alignment film.
- an organic solvent is preferably used as a solvent used for preparing the coating solution.
- organic solvents include amides (eg, N, N-dimethylformamide), sulfoxides (eg, dimethyl sulfoxide), heterocyclic compounds (eg, pyridine), hydrocarbons (eg, benzene, hexane), anolalkyl halides (eg, Example, black mouth form, dichloromethane, tetrachloroethane), ester (eg, methyl acetate, butyl acetate), ketone (eg, acetone, methyl ethyl ketone), ether (eg, tetrahydrofuran, 1,2-dimethoxyethane) ) Is included. Alkyl halides and ketones are preferred. Two or more organic solvents may be used in combination.
- the coating solution can be applied by a known method (eg, wire bar coating method, extrusion coating method, direct gravure coating method, reverse gravure coating method, die coating method).
- a known method eg, wire bar coating method, extrusion coating method, direct gravure coating method, reverse gravure coating method, die coating method.
- the thickness of the optically anisotropic layer should be from 0.:! To 20 / im, preferably S, more preferably from 0.5 to 15 ⁇ , most preferably from 1 to: 10 / m. I like it.
- the aligned liquid crystal molecules can be fixed while maintaining the alignment state.
- the immobilization is preferably performed by a polymerization reaction.
- the polymerization reaction includes a thermal polymerization reaction using a thermal polymerization initiator and a photopolymerization reaction using a photopolymerization initiator.
- Photopolymerization reaction is preferred Examples of photopolymerization initiators include a-carbonyl compounds (described in US Pat. No. 2,367,661 and US Pat. No. 2,367,670) and acyloin ether (described in US Pat. No. 2448828). ), A-hydrocarbon substituted aromatic acyloin compound (described in US Pat. No.
- the amount of the photopolymerization initiator used is preferably in the range of 0.01 to 20% by mass of the solid content of the coating solution, and more preferably in the range of 0.5 to 5% by mass.
- the irradiation energy is preferably in the range of 20mjZcm 2 ⁇ 50jZcm 2 tool 20-50
- light irradiation may be performed under heating conditions.
- a protective layer may be provided on the optically anisotropic layer.
- the optically anisotropic layer is formed by coating the coating liquid for the optically anisotropic layer as described above on the surface of the polarizing film.
- the stress strain X cross-sectional area X elastic modulus
- the polarizing plate according to the present invention is attached to a large liquid crystal display device, an image with high display quality can be displayed without causing problems such as light leakage.
- the inclination angle of the polarizing layer and the optical compensation layer should be stretched so as to match the angle formed by the transmission axis of the two polarizing plates bonded to both sides of the liquid crystal cell constituting the LCD and the vertical or horizontal direction of the liquid crystal cell. Is preferred.
- the normal inclination angle is 45 °. Recently, however, devices that are not necessarily 45 ° have been developed for transmissive, reflective, and transflective LCDs, and it is preferable that the stretching direction can be arbitrarily adjusted according to the design of the LCD.
- the alignment state in the liquid crystal cell is an alignment state in which the rod-like liquid crystal molecules rise at the center of the cell and the rod-like liquid crystal molecules lie near the cell substrate.
- Rod-like liquid crystalline molecules are arranged in a substantially opposite direction (symmetrically) between the top and bottom of the liquid crystal cell. This is a liquid crystal cell in a bend alignment mode.
- a liquid crystal display device using a bend alignment mode liquid crystal cell is disclosed in US Pat. No. 4,583,825 and US Pat. No. 5,410,422. Since the rod-like liquid crystal molecules are aligned symmetrically between the upper and lower portions of the liquid crystal cell, the bend alignment mode liquid crystal cell has a self-optical compensation function. Therefore, this liquid crystal mode is also called OCB (Optically Compensatory Bend) liquid crystal mode.
- OCB Optically Compensatory Bend
- the OCB mode liquid crystal cell is in the black display, and the alignment state in the liquid crystal cell is such that the rod-like liquid crystalline molecules rise at the center of the cell and the rod-like liquid crystalline molecules lie near the cell substrate. is there.
- the feature is that the rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied.
- the rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied.
- the VA mode is multi-domained to expand the viewing angle. (MVA mode) liquid crystal cell (described in SID97, Digest of tech.
- optical compensation can be made in the same way as described above.
- the antireflection film generally comprises a low refractive index layer which is also an antifouling layer, and at least one layer having a refractive index higher than that of the low refractive index layer (ie, a high refractive index layer and a medium refractive index layer). It is provided on a transparent substrate.
- antireflection films formed by laminating and applying thin films in which inorganic particles are dispersed in a matrix have been proposed as antireflection films with high productivity.
- the antireflection film which consists of the antireflection film which provided the anti-glare property in which the surface of the uppermost layer has the shape of a fine unevenness to the antireflection film by application
- the cellulose acylate film of the present invention is a coating method (coating type) that is particularly preferred for its ability to be applied to any of the above methods.
- An antireflection film comprising a layer structure of at least a medium refractive index layer, a high refractive index layer, and a low refractive index layer (outermost layer) on the substrate is designed to have a refractive index satisfying the following relationship: .
- a hard coat layer is provided between the transparent support and the middle refractive index layer. Also good. Further, it may comprise a medium refractive index hard coat layer, a high refractive index layer and a low refractive index layer.
- Other functions may be imparted to each layer, for example, an antifouling low refractive index layer or an antistatic high refractive index layer (eg, JP-A-10-206603, JP-A-2002). No. 243906) and the like.
- the haze of the antireflection film is preferably 5% or less, more preferably 3% or less.
- the strength of the film is preferably 2H or higher, more preferably 3H or higher, most preferably 3H or higher in the pencil hardness test according to JIS K5400.
- the layer having a high refractive index of the antireflection film is composed of a curable film containing at least an inorganic compound ultrafine particle having a high refractive index having an average particle size of lOOnm or less and a matrix binder.
- Examples of the high refractive index inorganic compound fine particles include inorganic compounds having a refractive index of 1.65 or more, preferably those having a refractive index of 1.9 or more.
- Ti, Zn, Sb, Sn, Zr examples thereof include oxides such as Ce, Ta, La, and In, and composite oxides containing these metal atoms.
- a surface treatment agent for example, silane coupling agent, etc .: JP-A-11-295503, JP-A-11-153703, JP 2000-9908, anionic compound or organometallic coupling agent: Japanese Patent Laid-Open No.
- Examples of the material for forming the matrix include conventionally known thermoplastic resins and curable resin films.
- the composition is selected from a polyfunctional compound-containing composition containing at least two radically polymerizable and / or cationically polymerizable groups, an organometallic compound containing a hydrolyzable group, and a partial condensate composition thereof.
- At least one composition is preferred.
- compounds described in JP-A 2000-47004, JP-A 2001-315242, JP-A 2001-31871, JP-A 2001-296401 and the like can be mentioned.
- a colloidal metal oxide obtained from a hydrolyzed condensate of metal alkoxide and a curable film obtained from a metal alkoxide composition are also preferred. For example, it is described in JP-A-2001-293818.
- the refractive index of the high refractive index layer is generally 1.70 to 2.20.
- the thickness of the high refractive index layer is preferably 5 nm to 10 ⁇ m, more preferably 10 nm to 1 ⁇ m.
- the refractive index of the middle refractive index layer is adjusted to be a value between the refractive index of the low refractive index layer and the refractive index of the high refractive index layer.
- the refractive index of the medium refractive index layer is preferably 1.50 to: 1.70 [low refractive index layer]
- the low refractive index layer is sequentially laminated on the high refractive index layer.
- the refractive index of the low refractive index layer is 1.20 to: 1.55. Preferably 1.30 to: 1.50.
- the outermost layer having scratch resistance and antifouling property.
- As a means to greatly improve the scratch resistance it is effective to impart slipperiness to the surface.
- a thin film layer means including introduction of fluorine can be applied.
- the refractive index of the fluorine-containing compound is preferably 1.35 to: 1.50. More preferably, it is 1.36-1.47.
- the fluorine-containing compound is preferably a compound containing a crosslinkable or polymerizable functional group containing a fluorine atom in a range of 35 to 80% by mass.
- the silicone compound is a compound having a polysiloxane structure, and preferably contains a curable functional group or a polymerizable functional group in the polymer chain and has a crosslinked structure in the film.
- examples thereof include reactive silicone (eg, Silaplane (manufactured by Chisso Corporation), polysiloxane containing silanol groups at both ends (JP-A-11-258403, etc.), and the like.
- the coating composition for forming the outermost layer containing a polymerization initiator, a sensitizer, etc. is applied at the same time or applied. It is preferable to carry out by light irradiation or heating later.
- a Zonolegel cured film in which an organometallic compound such as a silane coupling agent and a specific fluorine-containing hydrocarbon group-containing silane coupling agent are cured by a condensation reaction in the presence of a catalyst.
- an organometallic compound such as a silane coupling agent and a specific fluorine-containing hydrocarbon group-containing silane coupling agent are cured by a condensation reaction in the presence of a catalyst.
- a polyfluoroalkyl group-containing silane compound or a partially hydrolyzed condensate thereof JP-A 58-142958, JP-A 58_147483, JP-A 58-147484, JP-A 9-9 157582, compounds described in JP-A-11-106704, etc.
- silyl compounds containing a poly (perfluoroalkyl ether) group which is a fluorine-containing long chain group JP-A 2000-117902, JP 2001-48590, JP 2
- the low-refractive index layer is a primary particle flat such as a filler (for example, silicon dioxide (silica), fluorine-containing particles (magnesium fluoride, calcium fluoride, barium fluoride)) as an additive other than the above.
- a filler for example, silicon dioxide (silica), fluorine-containing particles (magnesium fluoride, calcium fluoride, barium fluoride)
- fluorine-containing particles magnesium fluoride, calcium fluoride, barium fluoride
- silane coupling agents 20] to [0038]), silane coupling agents, slip agents, surfactants, and the like.
- the low-refractive index layer When the low-refractive index layer is located below the outermost layer, the low-refractive index layer is formed by the vapor phase method (vacuum deposition method).
- the coating method is preferable because it can be manufactured at a low cost.
- the film thickness of the low refractive index layer is preferably 30 to 200 nm, preferably 50 to: 150 nm, and more preferably 60 to 120 nm.
- the hard coat layer is provided on the surface of the transparent support in order to impart physical strength to the antireflection film. In particular, it is preferably provided between the transparent support and the high refractive index layer.
- the hard coat layer is preferably formed by a crosslinking reaction or a polymerization reaction of a light and / or heat curable compound.
- the curable functional group is preferably a photopolymerizable functional group
- the hydrolyzable functional group-containing organometallic compound is preferably an organic alkoxysilyl compound.
- composition of the hard coat layer include those described in JP-A-2002-144913, JP-A-2000-9908, International Publication WOO / 46617, and the like.
- the high refractive index layer can also serve as a hard coat layer. In such a case, it is preferable to form fine particles dispersed in the hard coat layer using the method described for the high refractive index layer.
- the hard coat layer can also serve as an antiglare layer (described later) provided with particles having an average particle size of 0.2 to 10 zm and imparted with an antiglare function (antiglare function).
- the film thickness of the hard coat layer can be appropriately designed depending on the application.
- the film thickness of the hard coat layer is preferably from 0.2 to 10 111, more preferably from 0.5 to 7 xm.
- the strength of the hard coat layer is preferably H or higher, more preferably 2H or higher, most preferably 3H or higher, in a pencil hardness test according to JIS K5400. or, In the Taber test according to JIS K5400, the smaller the wear amount of the specimen before and after the test, the better.
- the forward scattering layer is provided in order to give a viewing angle improvement effect when the viewing angle is tilted vertically and horizontally when applied to a liquid crystal display device.
- the forward scattering layer By dispersing fine particles having different refractive indexes in the hard coat layer, it can also serve as a hard coat function.
- Japanese Patent Application Laid-Open No. 11-38208 with a specific forward scattering coefficient Japanese Patent Application Laid-Open No. 2000-199809 with a relative refractive index of transparent resin and fine particles in a specific range
- a primer layer an antistatic layer, an undercoat layer or a protective layer may be provided.
- Each layer of the anti-reflection film is formed by dip coating, air knife coating, curtain coating, roller coating, wire bar coating, gravure coating, micro gravure method, and etatrusion coating method (US Pat. No. 2681294). ) Can be formed by coating.
- the antireflection film may have an antiglare function that scatters external light.
- the antiglare function is obtained by forming irregularities on the surface of the antireflection film.
- the haze of the antireflection film is preferably 3 to 30%, more preferably 5 to 20%, and most preferably 7 to 20%. .
- any method can be applied as long as these surface shapes can be sufficiently maintained.
- a method of forming irregularities on the film surface using fine particles in the low refractive index layer for example, JP-A-2000-271878, a lower refractive index layer (high refractive index layer, medium refractive index).
- a surface uneven film is formed by adding a small amount (0.:!-50 mass%) of relatively large particles (particle size 0.05-2 zm) to the layer or hard coat layer).
- a method of providing a low refractive index layer while maintaining the shape for example, JP-A-200 No.
- the cellulose acylate film is measured under the following conditions using a three-dimensional surface structure analysis microscope (New View 5022 manufactured by Zygo).
- the number of peaks (convex parts) having a height of 0 ⁇ 1 ⁇ to 100 ⁇ , and valleys (concave portions) having a depth of 0 ⁇ 1 / im ⁇ : 100 / im were counted.
- the convex part and the concave part are both connected continuously in the MD direction by lmm or more.
- the number of convex and concave portions was divided by the measurement width (2.8 mm) and then multiplied by 100 to obtain the number of convex and concave portions per 10 cm.
- the above measurements are averaged by measuring 30 points at equal intervals over the entire width of the formed Sampnore film, and the number of protrusions and recesses per 10 cm width is obtained.
- a viscoelasticity measuring apparatus using a parallel cone (for example, a modular comparator rheometer manufactured by Anton Paar: Physica MCR301) is used for the measurement according to the following procedure.
- a viscoelasticity measuring apparatus using a parallel cone (for example, a modular comparator rheometer manufactured by Anton Paar: Physica MCR301) is used for the measurement according to the following procedure.
- the parallel cone gap is 500 zm and the temperature is 220 ° C. .
- the parallel cone gap is 500 zm and the temperature is 220 ° C. .
- the degree of acyl substitution of cellulose acylate is determined by 13 C-NMR according to the method described in Carbohydr. Res. 273 (1995) 83-91 (Tezuka et al.).
- the falling seconds were measured at 25 ° C., and the degree of polymerization was determined by the following formula.
- cellulose acylates having different types of acylol groups and different degrees of substitution were prepared.
- sulfuric acid (7.8 parts by weight with respect to 100 parts by weight of cellulose) was added as a catalyst, and carboxylic acid as a raw material for the acyl substituent was added to carry out an acylation reaction at 40 ° C. It was.
- the type and substitution degree of the acyl group were adjusted by adjusting the type and amount of the carboxylic acid. Aging was carried out at 40 ° C after this step.
- cellulose acylates having different degrees of polymerization were obtained.
- cellulose acylate was washed with warm water at 50 ° C. By changing this time, cellulose acylate having different residual sulfuric acid amounts as shown in Table 1 was obtained.
- the amount of residual sulfuric acid is obtained by wet ashing cellulose acylate, quantifying the amount of S by atomic absorption spectrometry, and converting it from the quantitative value.
- any one of the following compounds A to D which is a compound containing two or more aromatic rings, was added in an amount shown in Table 1.
- Compound A (compound having the following structure with a molecular weight of 100 to 3000)
- the obtained cellulose acylate contains the following compound X which is a fatty acid having 26 carbon atoms.
- triphenyl phosphate 2 weight 0 of silicon dioxide particles (Aerojiru R972V) was added 0.05% by weight.
- the mass% shown in the Examples and Table 1 all indicate the weight ratio to the cellulose acylate.
- Neck-in rate (%) 100 X ⁇ (Die lip width)-(Film forming film width) ⁇ Z (Die lip width) (Tg_ 5) ° C Tg (Tg_ 10)
- Three CDs with a diameter of 40cm set to ° C Pass continuously This was solidified to obtain a cellulose acylate film having a thickness of 125 / im. This was trimmed 5 cm at both ends, and then it was scraped off with a thickness of 10 mm and a thickness of 50 / im at both ends. For each sample, the width was 1.5 m, and 3000 m was wound at 30 m / min. Tg was as shown in Table 1.
- the cellulose acylate sheet was longitudinally stretched and / or transversely stretched at the magnifications shown in Table 1 at Tg + 15 ° C. All stretching was performed at 300% Z. Table 1 shows the Re and Rth values of the finale.
- the surface was hydrophilized according to the following immersion hatching method.
- the following coating hatching was also performed, but the same results as in the immersion hatching were obtained.
- a 1.5 mol / L aqueous solution of NaOH as the hatching solution was adjusted to 60 ° C., and the cellulose acylate film was immersed for 2 minutes. Thereafter, it was immersed in a 0.05 mol / L sulfuric acid aqueous solution for 30 seconds, and then passed through a water washing bath.
- Example 1 of Japanese Patent Application Laid-Open No. 2001-141926 the difference in peripheral speed between the two pairs of nip rolls A polarizing layer was prepared by stretching in the longitudinal direction.
- the polarizing layer thus obtained, the above-mentioned hatched unstretched cellulose acylate film and stretched cellulose acylate film were combined with PVA (Kuraray Co., Ltd. PVA_117H) 3% aqueous solution as an adhesive.
- the polarizing axis and the cellulose acylate film were laminated so that the longitudinal direction was 45 degrees.
- an unstretched cellulose acylate film was attached to a 20-inch VA liquid crystal display (LCD) described in FIGS. 2 to 9 of JP-A-2000-154261 and evaluated.
- An optical compensation filter film was produced using the stretched cellulose acylate film of the present invention instead of the cellulose acetate film coated with the liquid crystal layer of Example 1 of JP-A-7-333433. A good optical compensation film could be produced.
- the cellulose acylate film of the present invention was prepared in accordance with Example 47 of the Japan Institute of Invention and Technology (Publication No. 2001 _ 17 45), and the stretched cellulose acylate film of the present invention and an unstretched cell port When a low reflection film was prepared using a film, good optical performance without blur was obtained. [0128] 6. Creation of LCD device
- the polarizing plate of the present invention is an optically different display comprising the liquid crystal display device described in Example 1 of JP-A-10-48420 and the discotic liquid crystal molecule described in Example 1 of JP-A-9-26572.
- the low reflection film of the present invention was applied to the outermost layer of these liquid crystal display devices and evaluated, good visual performance without blur was obtained. Similar experiments were performed with cellulose acetate propionate (substitution degree of Example 37), but similar effects were obtained. The same effect was obtained even when the unstretched film thickness was 50 ⁇ m or 100 ⁇ m.
- any one of the following compounds X to Z which are fatty acids having 2 to 6 carbon atoms, was added in an amount described in Table 2.
- Plasticizer A Polyethylene glycol (molecular weight 600)
- Plasticizer B Glycerin diacetate
- Plasticizer C Glycerin tetracaprylate
- Plasticizer D Glycerin diacetate laurate [0131] To all the levels, 0.05% by mass of silicon dioxide part particles (Aerosil R972V) and 0.1% by mass of a stabilizer (bis 2,6-diethyl-4-methylphenyl) pentaerythritol diphosphite) were added. The mass% shown in the Examples and Table 2 are all mass ratios relative to cellulose silicate.
- Example A It was pelletized and dried in the same manner as in Example A, melted at 215 ° C., and then extruded through a die lip set at the temperature shown in Table 2.
- the equipment used was positioned so that the value (L / R) obtained by dividing the distance (L) between the die lip and the center of the casting drum (C D) by the CD radius (R) was the value shown in Table 2.
- the distance from the die lip tip to the ground on the CD should be 5 cm.
- a 3 kV electrode is placed 5 cm away from the melt and 5 cm at both ends.
- Table 2 shows the results of calculating the neck-in rate at this time according to the following formula.
- Neck-in rate (%) 100 X ⁇ (Die lip width) (Film forming film width) ⁇ / (Die lip width)
- Substituted with an acetylinole (Ac) group does not include “compounds containing two or more aromatic rings” compared to those substituted with a butylyl (Bu) group or an acetylinole (Ac) group (CAB).
- the occurrence of “fine irregularities” in the case was small, and there was little blur on the LCD (invention p and u, q and v). Further, this effect was particularly remarkable when the degree of polymerization was less than 240 (invention t, t ′).
- the cellulose acylate sheet film was stretched at the magnifications shown in Table 2 under the same conditions as in Example A, and Table 2 shows Re and Rth of the obtained film.
- a cellulose acylate film was dipped and hatched in the same manner as in Example A. Fujitac was similarly dipped and hatched.
- a polarizing layer was prepared in the same manner as in Example A.
- the polarizing layer thus obtained and the above-mentioned hatched unstretched and stretched cellulose acylate film were selected from the following layer structures (described in Table 2) and pasted in the same manner as in Example A. .
- Polarizing plate A Unstretched cellulose acylate film / Polarizing film / Fujitac (Fuji Photo Film TD80U)
- Polarizing plate B Unstretched cellulose acylate film / polarizing film / unstretched cellulose acylate film
- Polarizing plate C Stretched cellulose acylate film Z Polarizing film Z Fujitac (Fuji Photo Film TD80U)
- Polarizing plate D Stretched cellulose acylate film / Polarizing film / Unstretched cellulose acylate film
- Polarizing plate E Stretched cellulose acylate film Z Polarizing film Z-stretched cellulose acylate Finolem
- polarizing plates are 20 inch VA type described in FIGS. 2 to 9 of JP-A-2000-154261. It was installed and evaluated as a polarizing plate for a liquid crystal display (LCD).
- the polarizing plates A and B were replaced with LC D polarizing plates, and the polarizing plates C to E were replaced with polarizing plates and retardation plates.
- “blur width” was measured in the same manner as in Example A, and the results are shown in Table 2. Good performance was obtained with the present invention.
- the polarizing plate of the present invention was applied to an optically anisotropic layer containing discotic liquid crystal molecules, an alignment film coated with polyvinyl alcohol, a VA liquid crystal display device, and an OC B liquid crystal display device. Good performance was obtained when used. Furthermore, when the low reflection film of the present invention was applied to the outermost layer of these liquid crystal display devices and evaluated, good visual performance without blurring was obtained.
- Example 2 In contrast to the present invention a, p to v of Example 2, the touch roll described in Example 1 of JP-A-11-235747 (which is described as a double holding roll) is used (however, a thin metal outer cylinder) Thickness is
- the cellulose acylate film of the present invention can greatly eliminate display failures (blurring) that occur when incorporated in a liquid crystal display device. For this reason, the industrially usable lifetime is extremely high.
- FIG. 1 is a diagram for explaining a mechanism for generating fine irregularities.
- FIG. 2 is a diagram for explaining the relationship between the shape of the die lip and the adhesiveness of the melt.
- FIG. 3 is a diagram showing a positional relationship between a die lip and a casting drum.
- FIG. 4 is a diagram illustrating melt film formation using touch rolls.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2005800444478A CN101090928B (zh) | 2004-12-22 | 2005-12-22 | 酰化纤维素薄膜 |
US11/793,603 US8247041B2 (en) | 2004-12-22 | 2005-12-22 | Cellulose acylate film |
KR1020077016240A KR101242993B1 (ko) | 2004-12-22 | 2005-12-22 | 셀룰로오스아실레이트 필름 |
Applications Claiming Priority (4)
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JP2004372110 | 2004-12-22 | ||
JP2004-372110 | 2004-12-22 | ||
JP2005-134243 | 2005-05-02 | ||
JP2005134243 | 2005-05-02 |
Publications (1)
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WO2006068219A1 true WO2006068219A1 (ja) | 2006-06-29 |
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ID=36601816
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/023588 WO2006068219A1 (ja) | 2004-12-22 | 2005-12-22 | セルロースアシレートフィルム |
Country Status (4)
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US (1) | US8247041B2 (ja) |
KR (1) | KR101242993B1 (ja) |
CN (1) | CN101090928B (ja) |
WO (1) | WO2006068219A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008010360A1 (en) * | 2006-07-19 | 2008-01-24 | Konica Minolta Opto, Inc. | Optical film and method for production thereof |
WO2019049196A1 (ja) * | 2017-09-05 | 2019-03-14 | 株式会社ダイセル | 混合脂肪酸セルロースエステル及び混合脂肪酸セルロースエステルの製造方法 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20020037388A (ko) * | 2000-11-14 | 2002-05-21 | 황인철 | 탈모 예방 및 방지를 위한 약재와 그 약재의 제조방법 |
JPWO2008026514A1 (ja) * | 2006-09-01 | 2010-01-21 | コニカミノルタオプト株式会社 | セルロースアシレートフィルムの製造方法、セルロースアシレートフィルム、偏光板及び液晶表示装置 |
US7903219B2 (en) * | 2007-08-16 | 2011-03-08 | Sony Corporation | Liquid crystal display device |
US20100055404A1 (en) * | 2008-09-02 | 2010-03-04 | Fujifilm Corporation | Method for producing film and optical film |
KR101598729B1 (ko) | 2009-06-23 | 2016-02-29 | 미츠비시 레이온 가부시키가이샤 | 반사 방지 물품 및 디스플레이 장치 |
US20120295040A1 (en) * | 2010-01-08 | 2012-11-22 | Konica Minolta Advanced Layers ,Inc. | Hard coat film, polarizing plate and liquid crystal display device |
JP6334247B2 (ja) * | 2014-05-01 | 2018-05-30 | 株式会社Tbm | 再生フィラー含有プラスチックシート及びその製造方法 |
FI20205967A1 (en) * | 2020-10-02 | 2022-04-03 | Woodly Oy | Co-extruded multilayer cellulose-based film and a process for its production |
Citations (3)
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JP2002146043A (ja) * | 2000-11-09 | 2002-05-22 | Fuji Photo Film Co Ltd | セルロースアシレートフイルム |
JP2006002025A (ja) * | 2004-06-17 | 2006-01-05 | Fuji Photo Film Co Ltd | セルロースアシレート製剤及びセルロースアシレートフィルム |
JP2006002026A (ja) * | 2004-06-17 | 2006-01-05 | Fuji Photo Film Co Ltd | セルロースアシレート製剤、及びセルロースアシレートフィルム |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US5219510A (en) * | 1990-09-26 | 1993-06-15 | Eastman Kodak Company | Method of manufacture of cellulose ester film |
EP1237017A1 (en) * | 2001-02-20 | 2002-09-04 | Fuji Photo Film Co., Ltd. | Polarizing plate protection film |
US7038744B2 (en) * | 2002-01-09 | 2006-05-02 | Konica Corporation | Polarizing plate having a stretched film on a side thereof and liquid crystal display employing the same |
US7083752B2 (en) * | 2002-05-20 | 2006-08-01 | Eastman Kodak Company | Cellulose acetate films prepared by coating methods |
JP4300106B2 (ja) * | 2003-12-19 | 2009-07-22 | 富士フイルム株式会社 | セルロースアシレートフィルム及びその製膜方法 |
JP5470672B2 (ja) * | 2004-12-09 | 2014-04-16 | コニカミノルタ株式会社 | セルロースエステルフィルムの製造方法 |
-
2005
- 2005-12-22 US US11/793,603 patent/US8247041B2/en not_active Expired - Fee Related
- 2005-12-22 WO PCT/JP2005/023588 patent/WO2006068219A1/ja active Application Filing
- 2005-12-22 CN CN2005800444478A patent/CN101090928B/zh not_active Expired - Fee Related
- 2005-12-22 KR KR1020077016240A patent/KR101242993B1/ko not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002146043A (ja) * | 2000-11-09 | 2002-05-22 | Fuji Photo Film Co Ltd | セルロースアシレートフイルム |
JP2006002025A (ja) * | 2004-06-17 | 2006-01-05 | Fuji Photo Film Co Ltd | セルロースアシレート製剤及びセルロースアシレートフィルム |
JP2006002026A (ja) * | 2004-06-17 | 2006-01-05 | Fuji Photo Film Co Ltd | セルロースアシレート製剤、及びセルロースアシレートフィルム |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008010360A1 (en) * | 2006-07-19 | 2008-01-24 | Konica Minolta Opto, Inc. | Optical film and method for production thereof |
TWI381932B (zh) * | 2006-07-19 | 2013-01-11 | Konica Minolta Opto Inc | Optical film and its manufacturing method |
KR101352729B1 (ko) * | 2006-07-19 | 2014-01-16 | 코니카 미놀타 어드밴스드 레이어즈 인코포레이티드 | 광학 필름과 그의 제조 방법 |
WO2019049196A1 (ja) * | 2017-09-05 | 2019-03-14 | 株式会社ダイセル | 混合脂肪酸セルロースエステル及び混合脂肪酸セルロースエステルの製造方法 |
Also Published As
Publication number | Publication date |
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US20080113118A1 (en) | 2008-05-15 |
CN101090928B (zh) | 2010-06-30 |
US8247041B2 (en) | 2012-08-21 |
KR101242993B1 (ko) | 2013-03-12 |
KR20070089233A (ko) | 2007-08-30 |
CN101090928A (zh) | 2007-12-19 |
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