WO2008062610A1 - Procédé de fabrication de film optique, film d'ester de cellulose, polariseur et dispositif d'affichage à cristaux liquides - Google Patents
Procédé de fabrication de film optique, film d'ester de cellulose, polariseur et dispositif d'affichage à cristaux liquides Download PDFInfo
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- WO2008062610A1 WO2008062610A1 PCT/JP2007/069735 JP2007069735W WO2008062610A1 WO 2008062610 A1 WO2008062610 A1 WO 2008062610A1 JP 2007069735 W JP2007069735 W JP 2007069735W WO 2008062610 A1 WO2008062610 A1 WO 2008062610A1
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- WIPO (PCT)
- Prior art keywords
- group
- film
- optical film
- producing
- cellulose ester
- Prior art date
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- 239000010408 film Substances 0.000 title claims abstract description 287
- 229920002678 cellulose Polymers 0.000 title claims abstract description 120
- -1 polarizer Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 86
- 239000012788 optical film Substances 0.000 title claims abstract description 59
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 60
- 230000008569 process Effects 0.000 title abstract description 19
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- 125000001424 substituent group Chemical group 0.000 claims description 65
- 239000000126 substance Substances 0.000 claims description 54
- 125000004432 carbon atom Chemical group C* 0.000 claims description 39
- 125000000217 alkyl group Chemical group 0.000 claims description 34
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- 238000006467 substitution reaction Methods 0.000 claims description 32
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- 238000002844 melting Methods 0.000 claims description 17
- 230000008018 melting Effects 0.000 claims description 17
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- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 3
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- 125000003710 aryl alkyl group Chemical group 0.000 description 10
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- 238000003786 synthesis reaction Methods 0.000 description 6
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- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 5
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- 125000001973 tert-pentyl group Chemical group [H]C([H])([H])C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 5
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 4
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- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 1
- 125000006296 sulfonyl amino group Chemical group [H]N(*)S(*)(=O)=O 0.000 description 1
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- XZHNPVKXBNDGJD-UHFFFAOYSA-N tetradecyl prop-2-enoate Chemical compound CCCCCCCCCCCCCCOC(=O)C=C XZHNPVKXBNDGJD-UHFFFAOYSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
- 229910021654 trace metal Inorganic materials 0.000 description 1
- WBYWAXJHAXSJNI-VOTSOKGWSA-M trans-cinnamate Chemical compound [O-]C(=O)\C=C\C1=CC=CC=C1 WBYWAXJHAXSJNI-VOTSOKGWSA-M 0.000 description 1
- 150000003918 triazines Chemical class 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- QQBLOZGVRHAYGT-UHFFFAOYSA-N tris-decyl phosphite Chemical compound CCCCCCCCCCOP(OCCCCCCCCCC)OCCCCCCCCCC QQBLOZGVRHAYGT-UHFFFAOYSA-N 0.000 description 1
- 125000002221 trityl group Chemical group [H]C1=C([H])C([H])=C([H])C([H])=C1C([*])(C1=C(C(=C(C(=C1[H])[H])[H])[H])[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 238000005866 tritylation reaction Methods 0.000 description 1
- 229960002703 undecylenic acid Drugs 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 229940070710 valerate Drugs 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000000811 xylitol Substances 0.000 description 1
- 235000010447 xylitol Nutrition 0.000 description 1
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 description 1
- 229960002675 xylitol Drugs 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
-
- 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
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/10—Polymers characterised by the presence of specified groups, e.g. terminal or pendant functional groups
Definitions
- the present invention relates to a method for producing an optical film, and more particularly to a method for producing a cellulose ester film useful for a polarizing plate protective film and a retardation film used in a liquid crystal display device.
- a cellulose ester film is used as an optical film, particularly as a polarizing plate protective film, a retardation film or an antireflection film.
- This cellulose ester film is generally manufactured by a solvent casting method.
- a manufacturing method by melt film formation in which cellulose ester is melted is studied. ing.
- the cellulose ester film produced by melt film formation has an adverse effect as contrast unevenness when used for a polarizing plate protective film in which the fluctuation range of the letter variation is large with respect to the humidity fluctuation. .
- Patent Document 1 Japanese Patent Publication No. 6-501040
- Patent Document 2 Japanese Patent Laid-Open No. 2000-352620
- Patent Document 3 Japanese Patent Laid-Open No. 2003-270442
- the object of the present invention is that the leveling is good and therefore the letter variation is small and the humidity depends on the humidity.
- An object of the present invention is to provide a method for producing a film with little variation.
- X is the degree of substitution of the acetyl group
- ⁇ is the degree of substitution of the propionyl group or butyryl group.
- the content of the sugar ester compound in the composition contains the cellulose ester. 9.
- R to R each independently represent a hydrogen atom or a substituent.
- R represents a hydrogen atom or a substituent, and n represents 1 force 4.
- n 1 force 4.
- R 6 1 represents a substituent, and when n is 2 to 4, R represents a divalent to tetravalent linking group.
- R forces R each independently represent a hydrogen atom or a substituent
- 2 5 7 are each independently a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or
- the antioxidant is a compound having a partial structure represented by the following general formula (C 1), (C 2), (C 3), (C 4) or (C 5) in the molecule.
- C 1 The antioxidant is a compound having a partial structure represented by the following general formula (C 1), (C 2), (C 3), (C 4) or (C 5) in the molecule.
- C 2 The antioxidant is a compound having a partial structure represented by the following general formula (C 1), (C 2), (C 3), (C 4) or (C 5) in the molecule.
- R force and R are the same or different and each represents a hydrogen atom or a C 1-10 carbon atom.
- the stretching process is 1.0 to 2.0 times in the casting direction and 1.01 to 2. in the width direction.
- a polarizing plate comprising the cellulose ester film described in 22 as a polarizing plate protective film.
- a liquid crystal display device using the polarizing plate according to 23 A liquid crystal display device using the polarizing plate according to 23.
- the leveling is good so that the letter variation is small and the fluctuation due to humidity is also small. can do.
- FIG. 1 is a schematic flow sheet showing one embodiment of an apparatus for carrying out the method for producing an optical film of the present invention.
- FIG. 2 is an enlarged flow sheet of a main part of the manufacturing apparatus of FIG.
- FIG. 3 (a) is an external view of the main part of the casting die
- FIG. 3 (b) is a sectional view of the main part of the casting die.
- FIG. 4 is a cross-sectional view of the first embodiment of the touch roll.
- FIG. 5 is a cross-sectional view taken along a plane perpendicular to the rotation axis of the second embodiment of the touch roll.
- FIG. 6 is a cross-sectional view in a plane including a rotation axis of a second embodiment of the touch roll.
- FIG. 7 is an exploded perspective view schematically showing a configuration diagram of a liquid crystal display device.
- the cellulose ester film according to the present invention contains a cellulose ester, a sugar ester compound, an acrylic polymer, and, if necessary, other additives.
- a composition containing these is melt cast to produce a cellulose ester film according to the present invention.
- the cellulose ester used in the present invention is not particularly limited! /, But the cellulose ester is a carboxylic acid ester having about 2 to 22 carbon atoms, and may be an ester of an aromatic carboxylic acid. A fatty acid ester is preferred.
- the lower fatty acid in the lower fatty acid ester of cellulose means a fatty acid having 6 or less carbon atoms.
- the acyl group bonded to the hydroxyl group may be linear or branched or may form a ring. Furthermore, another substituent may be substituted.
- the number of carbon atoms is preferably selected from among acyl groups having 2 to 6 carbon atoms.
- Preferred cellulose esters for the present invention are those that simultaneously satisfy the following formulas (A1) and (A2).
- X is the degree of substitution of the acetyl group
- ⁇ is the degree of substitution of the propionyl group or butyryl group.
- triacetyl cellulose and cellulose acetate propionate are particularly preferred, and cellulose acetate propionate is particularly preferred! /.
- ⁇ is preferably 1.0 ⁇ ⁇ ⁇ 1.5.
- the degree of substitution of the acyl group can be measured according to ASTM-D817-96. [0035]
- the number average molecular weight of the cellulose ester used in the present invention is 60,000 to 300,000, and the mechanical strength of the resulting film is preferably strong. Furthermore, 70,000 to 200,000 are preferably used.
- the number average molecular weight of the cellulose ester can be measured as follows.
- the measurement is performed by high performance liquid chromatography under the following conditions.
- the cellulose used as the raw material for the cellulose ester used in the present invention is not particularly limited, and examples thereof include cotton linter, wood pulp, and kenaf. Moreover, the cellulose ester obtained from them can be mixed and used at an arbitrary ratio.
- the acylating agent of the cellulose raw material is an acid anhydride (acetic anhydride, propionic anhydride, butyric anhydride)
- an organic acid such as acetic acid such as methylene chloride
- the reaction is carried out using an organic solvent and a protic catalyst such as sulfuric acid.
- the reaction is carried out using a basic compound such as amin as a catalyst. Specifically, it can be synthesized with reference to the method described in JP-A-10-45804.
- the 6th position of the glucose unit constituting the cellulose ester has a highly reactive primary hydroxyl group.
- This primary hydroxyl group is a cellulose ester produced using sulfuric acid as a catalyst. The process preferentially forms sulfate esters.
- the synthesized cellulose ester is preferably purified to remove low molecular weight components or to remove unacetylated or low acetylated components by filtration.
- Cellulose esters are also affected by trace metal components in cellulose esters. These are considered to be related to the water used in the manufacturing process. It is preferable to have fewer components that can become insoluble nuclei. Metal ions such as iron, calcium, and magnesium contain organic acidic groups. ! / In some cases, an insoluble material may be formed by salt formation with a polymer degradation product or the like, which is likely to be low.
- the cellulose ester film according to the present invention is obtained by melting a composition containing a sugar ester compound in which at least one structure selected from furanose structure and bilanose structure strength is 1 to 12; It is characterized by filming.
- sugar compound according to the present invention examples include glucose, galactose, mannose, fructose, xylose, arabinose, ratatose, sucrose, cellobiose, cellotriose, manoletriose, raffinose, etc. Those having both a structure and a bilanose structure are preferred.
- An example is sucrose.
- the sugar ester compound according to the present invention is one in which part or all of the hydroxyl groups of the sugar compound are esterified or a mixture thereof.
- the monocarboxylic acid used in synthesizing the sugar ester compound according to the present invention known aliphatic monocarboxylic acid, alicyclic monocarboxylic acid, aromatic monocarboxylic acid, etc. without particular limitation are used. Esterify and combine the sugar ester compound used in the present invention.
- the carboxylic acid used can be one kind or a mixture of two or more kinds.
- aliphatic monocarboxylic acids acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, enanthic acid, strong prillic acid, pelargonic acid, strong puric acid, 2-ethyl ether Xanthcarboxylic acid, undecylic acid, lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, heptadecylic acid, stearic acid, nonadecanoic acid, araquinic acid, behenic acid, lignoceric acid, serotic acid, heptacosanoic acid, montanic acid Saturated fatty acids such as melicic acid and lacteric acid, and unsaturated fatty acids such as undecylenic acid, oleic acid, sorbic acid, linoleic acid, linolenic acid,
- Examples of preferable alicyclic monocarboxylic acid include cyclopentanecarboxylic acid, cyclohexanecarboxylic acid, cyclooctanecarboxylic acid, and derivatives thereof.
- aromatic monocarboxylic acids examples include aromatic monocarboxylic acids having 1 to 5 substituents such as an alkyl group or an alkoxy group introduced into the benzene ring of benzoic acid such as benzoic acid or toluic acid.
- aromatic monocarboxylic acids having two or more benzene rings such as cinnamate, benzyl acid, biphenyl carboxylic acid, naphthalene carboxylic acid, tetralin carboxylic acid, or derivatives thereof. preferable.
- sugar ester compounds according to the present invention can be used from 0.5 to 35 mass 0/0 of the cellulose ester, preferably 1 to 30 wt%.
- R10 — C-CH a
- the weight average molecular weight of the acrylic polymer used in the present invention is preferably 500 to 70,000! /
- the acrylic polymer can be used in an amount of 0.5 to 35% by weight, preferably 1 to 30% by weight, based on the cellulose ester.
- the acrylic polymer according to the present invention includes an ethylenically unsaturated monomer Xa that does not have an aromatic ring and a hydrophilic group in the molecule, and an ethylene that does not have an aromatic ring in the molecule and has a hydrophilic group.
- Polymer X comprises an ethylenically unsaturated monomer Xa having no aromatic ring and a hydrophilic group in the molecule and an ethylenically unsaturated monomer Xb having no aromatic ring and a hydrophilic group in the molecule.
- Xa is an acryl or methallyl monomer having no aromatic ring and no hydrophilic group in the molecule
- Xb is an acryl or methallyl monomer having no hydrophilic ring in the molecule and having a hydrophilic group.
- the polymer X is represented by the following general formula (P1).
- R R represents H or CH.
- R represents an alkyl group having 1 to 12 carbon atoms;
- R represents —CH — —C H or —C H.
- Monomers as monomer units constituting the polymer X are listed below, but are not limited thereto.
- the hydrophilic group in X is a group having a hydroxyl group or an ethylene oxide chain.
- the ethylenically unsaturated monomer Xa having no aromatic ring and no hydrophilic group in the molecule includes, for example, methyl acrylate, ethyl acrylate, propyl acrylate (in), butyric acid nis-t pentyl acrylate ( nis), hexyl acrylate (ni heptyl acrylate (n—i octyl acrylate) (ni) nonyl acrylate (n—i myristyl acrylate) n— i acrylate (2-ethylhexyl), acrylic acid ( ⁇ 1 Methacrylic acid ester in which the acrylic acid ester is changed to a methacrylic acid ester.
- methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, and propyl methacrylate are preferable.
- the ethylenically unsaturated monomer Xb having no aromatic ring in the molecule and having a hydrophilic group is water
- Acrylic acid or methacrylic acid ester is preferred as the monomer unit having an acid group.
- acrylic acid (2-hydroxyethyl), acrylic acid (2-hydroxypropyl), acrylic acid (3-hydroxypropyl), Acrylic acid (4-hydroxybutyl), acrylic acid (2-hydroxybutyl), or those obtained by replacing these acrylic acids with methacrylic acid can be mentioned, and acrylic acid (2-hydroxyethyl) and methacrylic acid are preferred.
- Xc is not particularly limited as long as it is an ethylenically unsaturated monomer other than Xa and Xb and is copolymerizable, but preferably has no aromatic ring.
- the molar composition ratio m: n of Xa, Xb and Xc is preferably 99:;! To 65:35, more preferably 95: 5 to 75:25.
- P of Xc is 0-10.
- Xc may be a plurality of monomer units.
- the molar composition ratio of Xa and Xb is preferably determined as appropriate while optimizing the compatibility with the cellulose ester, optical properties, and the like.
- the molecular weight of the polymer X has a weight average molecular weight of 5,000 to 70,000, more preferably ⁇ 8,000 to 25,000.
- the weight average molecular weight of the polymer X can be adjusted by a known molecular weight adjusting method.
- Examples of such a molecular weight adjusting method include a method of adding a chain transfer agent such as carbon tetrachloride, lauryl mercabtan, octyl thiodalycolate, and the like.
- Polymer Y does not have an aromatic ring! /, And is a polymer having a weight average molecular weight of 500 or more and 3000 or less obtained by polymerizing ethylenically unsaturated monomer Ya.
- a weight average molecular weight of 500 or more is preferable because the residual monomer of the polymer decreases.
- Ya is preferably a le, acrylic or methacrylic monomer having an aromatic ring.
- the polymer Y is represented by the following general formula (P2).
- R represents H or CH.
- R represents an alkyl group or a cycloalkyl group having 1 to 12 carbon atoms.
- Yb is not particularly limited as long as it is an ethylenically unsaturated monomer copolymerizable with Ya.
- Y b may be plural.
- k + q 100 q is preferably 0-30.
- Ethylenically unsaturated monomer Ya constituting polymer Y obtained by polymerizing ethylenically unsaturated monomer Ya is an acrylate ester such as methyl acrylate or ethyl acrylate.
- Yb is not particularly limited as long as it is an ethylenically unsaturated monomer copolymerizable with Ya.
- the bull ester include, but are not limited to, butyl acetate, propionate, butyrate, valerate, and bivalate.
- Caproic acid bull, strength puric acid bull, lauric acid bull, myristic acid bull, palmitate bull, stearic acid bull, cyclohexane carbonic acid bull, octyl acid bull, methacrylate bull, crotonic acid bull, sorbic acid bull, cinnamon Acid bur is preferred.
- Yb may be plural.
- a method using a chain transfer agent such as a mercapto compound or carbon tetrachloride a method using a polymerization terminator such as benzoquinone dinitrobenzene in addition to the polymerization initiator, Examples include a method of bulk polymerization using a compound having one thiol group and a secondary hydroxyl group as described in Japanese Patent No. 128911 or 2000-344823, or a polymerization catalyst using the compound and an organometallic compound in combination. I can do it.
- the polymer Y is preferably a polymerization method using a compound having a thiol group and a secondary hydroxyl group in the molecule as a chain transfer agent.
- the terminal of the polymer Y has a hydroxyl group and thioether resulting from the polymerization catalyst and the chain transfer agent. This terminal residue can adjust the compatibility between Y and cellulose ester.
- the method for measuring the weight average molecular weight can be as follows.
- the weight average molecular weight Mw was measured using gel permeation chromatography.
- This measurement conforms to JIS K 0070 (1992).
- This hydroxyl value is defined as the number of mg of potassium hydroxide required to neutralize acetic acid bound to a hydroxyl group when sample lg is acetylated.
- sample Xg (about lg) is precisely weighed in a flask, and 20 ml of acetylating reagent (20 ml of acetic anhydride added to pyridine to make 400 ml) is accurately added. Attach an air condenser to the mouth of the flask and heat in a glycerin bath at 95 ° C or 100 ° C.
- B is the amount of 0.5 mol / L potassium hydroxide ethanol solution used in the blank test (ml)
- C is the amount of 0.5 mol / L potassium hydroxide ethanol solution used in the titration (ml)
- F is a factor of 0.5 mol / L potassium hydroxide ethanol solution
- D is acid value
- 28. 05 is 1/2 of 1 mol amount of potassium hydroxide 56 ⁇ 11
- a preferable range of the formula (i) is 10 to 25% by mass.
- the cellulose ester film according to the present invention can contain an antioxidant, a plasticizer, an ultraviolet absorber, fine particles, and the like, if necessary.
- antioxidants and heat deterioration inhibitors those that are usually known can be used.
- ratatones, io, phenols, double bonds, hindered amines, and phosphorus compounds can be preferably used.
- R to R each independently represent a hydrogen atom or a substituent.
- R represents a hydrogen atom or a substituent, and n represents 1 to 4.
- n 1 to 4.
- R 6 1 represents a substituent, and when n is 2 to 4, R represents a divalent to tetravalent linking group.
- the compound represented by the general formula (R) preferably has at least one hindered type substituent (for example, t-butyl group) in the molecule, particularly R force S hindered type. Preferably it is a substituent.
- the compound represented by the general formula (R) is more preferably a compound represented by the general formula (R-1).
- R2 to R5 each independently represent a hydrogen atom or a substituent.
- substituent an unsubstituted or substituted carbon atom having 1 to 8 carbon atoms is preferred; an alkyl group having! To 8 carbon atoms is more preferred.
- R to R are each independently a hydrogen atom, alkyl having 1 to 18 carbon atoms.
- the compound represented by the general formula (R-1) preferably has at least one hindered type substituent (for example, t- butyl group) in the molecule. Preferably it is a substituent.
- the phenolic compound preferably has a 2,6-dialkylphenol structure.
- Chino 'Specialty' Chemicals Co., Ltd. is commercially available under the trade names “Irganoxl076” and “IrganoxlOlO”. Those are preferred.
- the phosphorus compound is preferably a compound having in its molecule a partial structure represented by the following general formula (C 1), (C 2), (C 3), (C 4) or (C 5).
- substituents examples include a hydrogen atom, a halogen atom (for example, a fluorine atom, a chlorine atom, etc.), an alkyl group (for example, a methyl group, an ethyl group, an isopropyl group, a hydroxyethyl group, a methoxymethyl group, a trifluoromethylolore group, t butyl group), cycloalkyl group (for example, cyclopentinole group, cyclohexyl group, etc.), aralkyl group (for example, benzyl group, 2-phenethyl group, etc.), aryl group (for example, phenyl group, naphthyl group, p tolyl group) P-chlorophenyl group, etc.), alkoxy group (eg methoxy group, ethoxy group, isopropoxy group, butoxy group etc.), arylenoxy group (eg phenoxy group etc.), cyan
- Ph and Ph ′ represent a phenyl group, and the hydrogen atom of the phenyl group is
- Ph and Ph ' may be the same or different
- X represents a single bond, a sulfur atom or a CHR— group.
- R is a hydrogen atom, 1 to 8 carbon atoms
- Ph 2 and Ph ' 2 represent a substituent.
- the substituent has the same meaning as the above substituent. More preferably, Ph and Ph ′ represent a phenyl group or a biphenyl group, and the hydrogen atom of the phenyl group or biphenyl group is an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, It may be substituted with an alkylcycloalkyl group having 6 to 12 carbon atoms or an aralkyl group having 7 to 12 carbon atoms. Ph and Ph ′ may be the same as or different from each other. These may be substituted with the same substituents as those described above.
- Ph represents a substituent. As a substituent, it is synonymous with the said substituent. More preferred Or Ph represents a phenyl group or a biphenyl group, and the phenyl group or biphenyl group
- the hydrogen atom may be substituted with an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms. . In addition, these may be substituted with the same substituents as those described above.
- Ph represents a substituent. As a substituent, it is synonymous with the said substituent. More preferred
- Ph represents an alkyl group or a phenyl group having 1 to 20 carbon atoms
- the phenyl group may be substituted with a substituent having the same meaning as the above substituent.
- Ph, Pl ⁇ and PhP represent a substituent.
- the substituent is the same as the above substituent.
- Ph, Ph 'and Ph are alkyl groups having 1 to 20 carbon atoms.
- the phosphorus compound include triphenyl phosphite, diphenylisodecyl phosphite, phenyl diisodecyl phosphite, tris (noyulfeninore) phosphite, tris (dinouylfeninore) phosphite, tris (2, 4 di-t-butylphenol) phosphite, 1 0— (3,5 di-tert-butyl-4-hydroxybenzyl) 9, 10 dihydro-9-oxa 10-phosphaphenanthrene-10-oxide, 6— [3— (3 — T-Butyl 4- Droxy-5-methylphenyl) propoxy] —2, 4, 8, 10 tetra-tert-butyldibenz [d, f] [1,3,2] monophosphite compounds such as dioxaphosphepine and tridecyl phosphite; 4
- Triphenyl phosphonite Triphenyl phosphonite, tetrakis (2, 4-di-tert-butylphenyl) [1, 1-biphenyl] — 4, A '— dilbisphosphonite, tetrakis (2, 4-di-tert butyl-5-methylphenyl) [ 1, 1-biphenyl] —4, Phosphonite compounds such as monodibisbisphosphonite; triphenylphosphinite, 2, 6 dimethylphenyldiphenylphosphinite, etc. Phosphinite compounds; triphenyl phosphine, tris (2, 6-dimethoxy-phenylene Honoré) phosphine compounds such as phosphine; and the like.
- the above phosphorus compounds are, for example, "SumilizerGP” from Sumitomo Chemical Co., Ltd., ADK STAB PEP-24G "," ADK STAB PEP-3 6 "and” ADK STAB 3010 "from Asahi Denka Kogyo Co., Ltd. It is commercially available from Ciba Specialty Chemicals under the trade name “IRGAFOS P—E PQ” and from Yoshitomi Fine Chemical Co., Ltd. as “GSY—P101”.
- the phosphorus compounds are, for example, “SumilizerGP” from Sumitomo Chemical Co., Ltd., ADK STAB PEP—24G ”,“ ADK STAB PEP—36 ”and“ ADK STAB 3010 ”, Chino from Asahi Denka Kogyo Co., Ltd. “IRG AFOS P—EPQ” from “Specialty” Chemicals Co., Ltd. “GSY—P101” and “V” are commercially available under the product names from AIP Corporation!
- the above hindered amine compounds are, for example, “Tinuvinl44” and “Tinuvin770” from Ciba 'Specialty' Chemicals, Inc., and “ADK ST AB LA-52” from Asahi Denka Kogyo Co., Ltd. It is commercially available at! /, But something is preferred! /.
- the Xio compounds are preferably commercially available from Sumitomo Chemical Co., Ltd. under the trade names "Sumilizer TPL-R” and "Sumilizer TP-D", for example.
- Specific examples of the double bond compound include an attalylate group or a metatalylate group.
- a compound having a phenolic hydroxyl group in the same molecule is preferred, and a compound represented by formula (II) is preferred.
- R force and R are the same or different and each represents a hydrogen atom or a carbon number.
- alkyl groups 1 to 10 alkyl groups, preferably 1 to 5 alkyl groups.
- the alkyl group is selected in consideration of the effect as a stabilizer and ease of production. R indicated by force R
- alkyl groups include methyl group, ethyl group, ⁇ -propyl group, isopropylene group, ⁇ butyl group, sec butyl group, isobutyl group, tert butyl group, and 1,1 dimethylpropyl group.
- R and R include isopropyl
- R is a methyl group or ethyl
- R is a hydrogen atom or a methyl group.
- the compound having an attalylate group or a metatalylate group and a phenolic hydroxyl group in the same molecule is preferably a compound represented by the above general formula ( ⁇ ).
- the product names “Sumilyzer GS” and “Sumilyzer GM” (above, manufactured by Sumitomo Chemical Co., Ltd.) represented by the formula are commercially available.
- the compound having an allylate group or a metatalylate group and a phenolic hydroxyl group in the same molecule may be used in an amount of 0.01 to 5.0 parts by mass with respect to 100 parts by mass of the cellulose ester resin. preferable. 0.1 to 3.0 parts by weight are more preferred 0.5 to 1.0 parts by weight are particularly preferred.
- a compound having an epoxy group as described in US Pat. No. 4,137,201 may be contained.
- the amount of these antioxidants and the like to be added is appropriately determined in accordance with the process for recycling, but generally 0.05 to 20 masses relative to the resin that is the main raw material of the film. In the range of%.
- antioxidants and thermal degradation inhibitors can obtain a synergistic effect by using several different types of compounds in combination rather than using only one kind.
- the combined use of latatones, phosphorus, phenols and double bond compounds is preferred.
- the cellulose ester film according to the present invention may contain an additive that can be added to an ordinary cell mouth ester film.
- additives examples include plasticizers, ultraviolet absorbers, and fine particles.
- the ultraviolet absorber used in the present invention is not particularly limited! /, But for example, oxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, benzophenone compounds, cyanoacrylate compounds, triazine compounds Examples include compounds, nickel complex compounds, inorganic powders, and the like. It is good also as a polymer type ultraviolet absorber.
- Examples of the fine particles used in the present invention include inorganic compounds such as silicon dioxide, Mention may be made of titanium, aluminum oxide, zirconium oxide, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate and calcium phosphate.
- silicon dioxide is preferable because fine particles containing silicon are preferable because of low turbidity.
- the average primary particle size of the fine particles is preferably 5 to 50 nm, more preferably 7 to 20 nm. These are preferably contained mainly as secondary aggregates having a particle size of 0.05 to 0.3 m.
- the content of these fine particles in the cellulose ester film is preferably from 0.05 to 1% by mass, particularly preferably from 0.;! To 0.5% by mass. In the case of a cellulose ester film having a multi-layer structure formed by a co-casting method, it is preferable that the added amount of fine particles is contained on the surface.
- the fine particles are commercially available, for example, under the trade names of Aerosil R972, R972V, R974, R812, 200, 200V, 300, R202, 0X50, Ding 600, Yurodinole R976 and R811 (above made by Nyurodore Japan). And can be used.
- Examples of the polymer include silicone resin, fluororesin, and acrylic resin. Silicone resins are preferred, especially those having a three-dimensional network structure (e.g., Suzunonore 103, 105, 108, 120, 145, 3120 and 240 (and above) It is commercially available under the trade name of Toshiba Silicone Co., Ltd. and can be used.
- Aerosil 200V and Aerosil R972V are particularly preferably used because they have a large effect of reducing the friction coefficient while keeping the turbidity of the cellulose ester film low.
- the cellulose ester film In the production of the cellulose ester film according to the production method of the present invention, it is preferable to contain 1 to 30% by mass of at least one plasticizer in the film-forming material.
- the plasticizer is a power that is an additive having an effect of improving brittleness or imparting flexibility, generally by adding it to a polymer.
- a plasticizer is added to lower the melting temperature than the melting temperature alone, and to lower the melt viscosity of the film constituent material containing the plasticizer than the cellulose resin alone at the same heating temperature. It also improves the hydrophilicity of the cellulose ester, Since it is also added to improve the moisture permeability of the loose ester film, it functions as a moisture permeation preventive agent.
- the melting temperature of the film constituting material means a temperature in which the material is heated and fluidity is developed. In order to melt and flow the cellulose ester, it is necessary to heat at least a temperature higher than the glass transition temperature.
- the elastic modulus or viscosity decreases due to heat absorption, and fluidity is exhibited.
- the molecular weight of the cellulose ester may decrease due to thermal decomposition, which may adversely affect the mechanical properties of the resulting film. Must be melted.
- the force S can be achieved by adding a plasticizer having a melting point or glass transition temperature lower than the glass transition temperature of the cellulose ester.
- plasticizer examples include ester compounds having a structure in which an organic acid represented by the following general formula (1) and a trivalent or higher alcohol are condensed. This plasticizer is preferably contained in an amount of 1 to 25% by weight of the cellulose ester film.
- a cellulose ester film containing 3 to 20% by mass of the plasticizer is more preferable, and a cellulose ester film containing 5 to 15% by mass is more preferable.
- R to R are a hydrogen atom or a cycloalkyl group, an aralkyl group, an alkoxy group,
- L represents a linking group and represents a substituted or unsubstituted alkylene group, an oxygen atom, or a direct bond.
- the cycloalkyl group represented by R to R is preferably a cycloalkyl group having 3 to 8 carbon atoms.
- phenyl group is a group such as cyclopropyl, cyclopentyl, cyclohexyl and the like.
- substituents which may be substituted are preferably halogen atoms such as chlorine atom, bromine atom and fluorine atom, hydroxyl group, alkyl group, alkoxy group, cycloalkoxy group and aralkyl group.
- This phenyl group may be further substituted with an alkyl group or a halogen atom), an alkenyl group such as a buyl group or a allyl group, or a phenyl group (this phenyl group is further substituted with an alkyl group or a halogen atom).
- 2 or 8 carbon atoms such as phenoxy group (this phenyl group may be further substituted with an alkyl group or a halogen atom), acetyl group, propionyl group, etc.
- an unsubstituted carbonyloxy group having 2 to 8 carbon atoms such as an acetyloxy group and a propionyloxy group.
- Examples of the aralkyl group represented by R to R include a benzyl group, a phenethyl group, and a ⁇ -phenolate group.
- Preferred examples of the substituent which may be substituted are those such as propyl group, and the above cycloalkyl group may be substituted. The same groups may be mentioned.
- Examples of the alkoxy group represented by R to R include an alkoxy group having 1 to 8 carbon atoms,
- alkoxy group such as methoxy, ethoxy, n propoxy, n butoxy, n octyloxy, isopropoxy, isobutoxy, 2-ethynolehexenoreoxy, or t-butoxy.
- preferred substituents that may be substituted are halogen atoms such as chlorine atom, bromine atom, fluorine atom, hydroxyl group, alkoxy group, cycloalkoxy group, aralkyl group (this phenyl group).
- the group may be substituted with an alkyl group or a halogen atom), an alkenyl group, a phenyl group (this phenyl group may be further substituted with an alkyl group or a halogen atom), An alkoxy group (for example, a phenoxy group (this phenyl group may be further substituted with an alkyl group or a halogen atom)), an acetyl group such as a acetyl group, a propionyl group, an acetyl group, a propionyloxy group; Substituents having 2 to 8 carbon atoms Examples include an acyloxy group and an arylcarbonyloxy group such as a benzoyloxy group.
- the cycloalkoxy group represented by R to R is an unsubstituted cycloalkoxy group.
- C1-C8 cycloalkoxy group includes a C1-C8 cycloalkoxy group, and specific examples include cyclopropyloxy, cyclopentyloxy, cyclohexyloxy, and the like.
- these groups may be substituted, the above cycloalkyl group is substituted.
- the aryloxy group represented by R to R includes a force including a phenoxy group.
- the nyl group may be substituted with an alkyl group or a cycloalkyl group such as a halogen atom.
- Examples of the aralkyloxy group represented by R to R include a benzyloxy group and a phenethyloxy group.
- Examples of the isyl group represented by R to R include 2 to 20 carbon atoms such as an acetyl group and a propionyl group.
- Examples of the carbonyloxy group represented by R to R include an acetyloxy group and a propionino group.
- An unsubstituted acyloxy group having 2 to 8 carbon atoms such as an oxy group (hydrocarbon groups of the acyl group include alkyl, alkenyl and alkynyl groups), and an arylcarbonyloxy group such as a benzoyloxy group.
- these groups may be further substituted with the above-mentioned cycloalkyl group, or may be substituted with a group similar to the group! /, Or! /.
- Examples of the oxycarbonyl group represented by R to R include a methoxycarbonyl group and an ethoxycarbonyl group.
- the oxycarbonyloxy group represented by R to R includes a methoxycarbonyloxy group
- Any one of R to R may be connected to each other to form a ring structure.
- the linking group represented by L is a substituted or unsubstituted alkylene group, an oxygen atom, or a force representing a direct bond.
- the alkylene group is a group such as a methylene group, an ethylene group, or a propylene group. These groups may be further substituted with the groups represented by R to R.
- linking group represented by L is a direct bond and aromatic carboxylic acid.
- the organic acid represented by the general formula (1) constituting the ester compound used as the plasticizer includes at least R or R in the alkoxy group, the acyl group, the oxo group.
- the organic acid for substituting the hydroxyl group of the trivalent or higher alcohol may be a single type or a plurality of types.
- the trihydric or higher alcohol compound that reacts with the organic acid represented by the general formula (1) to form a polyhydric alcohol ester compound is preferably an aliphatic polyhydric alcohol having 3 to 20 valences.
- the trivalent or higher alcohol is preferably represented by the following general formula (3).
- m represents a positive integer of 3 or more
- an OH group represents an alcoholic hydroxyl group.
- Particularly preferred is a polyhydric alcohol of 3 or 4 as m.
- Examples of preferable polyhydric alcohols include, for example, the following.
- the present invention is not limited to these.
- Examples include tripentaerythritol, galactitonor, inositole, mannitol, 3-methylpentane 1,3,5-trioneol, pinacol, sonolebithonole, trimethylolpropane, trimethylolethane, and xylitol.
- glycerin, trimethylol ethane, trimethylol propane, and pentaerythritol are preferable.
- Esters of the organic acid represented by the general formula (1) and a trihydric or higher polyhydric alcohol can be synthesized by a known method. In the examples, representative synthesis examples are shown.
- a method of condensing an organic acid represented by the general formula (1) and a polyhydric alcohol in the presence of an acid for example, There are a method of reacting with a polyhydric alcohol by leaving it as a chloride or an acid anhydride, a method of reacting a phenyl ester of an organic acid with a polyhydric alcohol, etc. Is preferably selected.
- plasticizer comprising the organic acid represented by the general formula (1) and an ester of a trihydric or higher polyhydric alcohol, a compound represented by the following general formula (2) is preferable.
- R to R are a hydrogen atom or a cycloalkyl group, an aralkyl group, an alkoxy group,
- R represents a hydrogen atom or an alkyl group.
- the reloxy group, the aralkyloxy group, the acyl group, the carbonyloxy group, the oxycarbonyl group, and the oxycarbonyloxy group are the same as R to R in the general formula (1).
- the molecular weight of the polyhydric alcohol ester thus obtained is not particularly limited, It is preferably 300 to 500, more preferably 400 to 000. A smaller molecular weight is preferable in terms of moisture permeability and compatibility with cellulose ester, since higher molecular weights are less likely to volatilize.
- an ester compound produced from the organic acid represented by the general formula (1) and a trihydric or higher polyhydric alcohol may be used in combination with other plasticizers.
- the ester compound comprising the organic acid represented by the general formula (1) and a trihydric or higher polyhydric alcohol can be added at a high addition rate with high compatibility with the cellulose ester. Therefore, bleed-out does not occur even when other plasticizers and additives are used in combination, and other types of plasticizers and additives can be easily used together as necessary.
- plasticizers are not particularly limited, but are preferably polycarboxylic acid ester plasticizers, glycolate plasticizers, phthalate ester plasticizers, fatty acid ester plasticizers, and polyhydric alcohol esters. Selected from plasticizers, polyester plasticizers and acrylic plasticizers. Of these, when two or more plasticizers are used, at least one of them is preferably a polyhydric alcohol ester plasticizer! /.
- a polarizing film may be formed by forming an alignment film and providing a liquid crystal layer, and combining the optical film and a retardation derived from the liquid crystal layer to provide an optical compensation capability.
- a compound for adjusting the retardation may be contained in the cellulose ester film.
- the compound added to adjust the retardation is an aromatic compound having two or more aromatic rings, as described in EP 911, 656A2. You can also.
- aromatic ring of the aromatic compound includes an aromatic hetero ring in addition to an aromatic hydrocarbon ring.
- Aromatic heterocycles are particularly preferred, and aromatic heterocycles are generally unsaturated heterocycles. Of these, compounds having a 1,3,5-triazine ring are particularly preferred.
- the cellulose ester film according to the present invention preferably has a haze value of less than 1.0%, more preferably 0.5, because if the haze value exceeds 1.0%, it will affect the optical material. Less than%.
- the haze value can be measured based on JIS-K7136.
- a colorant means a dye or a pigment, but in the present invention, it means an agent having an effect of making the color tone of a liquid crystal screen a blue tone or adjusting a yellow index and reducing haze.
- Various dyes and pigments can be used as the colorant, but anthraquinone dyes, azo dyes, phthalocyanine pigments and the like are effective. Although the specific example of a preferable coloring agent is given to the following, it is not limited to these.
- the amount of colorant to be added can be appropriately selected according to the purpose.
- S preferably in the range of 0 ⁇ lOOppm to cellulose esterolenolem, preferably 0.5 ⁇ 20 to 20ppm Strongly preferred, and most preferred is 1 to 1 Oppm! /.
- the raw material is a cellulose ester, a sugar ester compound, an acrylic polymer, a plasticizer, and other additives such as a film structure.
- the composition material is required to have little or no generation of volatile components during the melting and film forming process. This is for foaming during heating and melting to reduce or avoid defects inside the film and flatness deterioration of the film surface.
- the content of the volatile component when the film constituent material is melted is 1% by mass or less, preferably 0.5% by mass or less, more preferably 0.2% by mass or less, and even more preferably 0. 1 It is desirable that it is less than mass%.
- TG / DTA200 manufactured by Seiko Denshi Kogyo Co., Ltd.
- the heating loss to 30 ° C, 250 ° C is obtained, and that amount is used as the content of volatile components! /
- the film constituent material to be used preferably removes volatile components typified by the moisture and the solvent before the film is formed or during heating.
- a known drying method can be applied to the removal method, such as a heating method, a reduced pressure method, a heated reduced pressure method, or the like, and it may be performed in air or in an atmosphere selected with nitrogen as an inert gas! /. When these known drying methods are used, it is preferable from the viewpoint of film quality that the film constituting material does not decompose!
- the resin By drying before film formation, generation of volatile components can be reduced, and the resin alone, or at least one mixture or compatible material other than the resin among the resin and the film constituent material. It can also be divided and dried.
- the drying temperature is preferably 70 ° C or higher.
- heating to a drying temperature higher than the glass transition temperature may cause the material to melt and become difficult to handle. It is preferable that the glass transition temperature or lower.
- the glass transition temperature of the lower glass transition temperature is used as a reference. More preferably, it is 70 ° C or more and (glass transition temperature 5) ° C or less, more preferably 110 ° C or more and (glass transition temperature 20) ° C or less.
- the drying time is preferably 0.5 to 24 hours, more preferably 1 to; 18 hours, and even more preferably 1.5 to 12 hours.
- the drying process may be divided into two or more stages.For example, the drying process is performed between a preliminary drying process for storing materials and immediately before film formation to one week before film formation. Even if it includes a drying step just before.
- the cellulose ester film according to the present invention is formed by melt casting.
- the molding method by melt casting which is heated and melted without using the solvent used in the solution casting method (for example, methylene chloride), is more specifically, melt extrusion molding method, press molding method, inflation method, injection method. It can be classified into molding method, blow molding method, stretch molding method and the like. Among these, the melt extrusion method is excellent for obtaining a cellulose ester film having excellent mechanical strength and surface accuracy.
- FIG. 1 is a schematic flow sheet showing the overall configuration of an apparatus for carrying out the method for producing an optical film of the present invention
- FIG. 2 is an enlarged view of a cooling roll portion from a casting die.
- the method for producing a cellulose ester film according to the present invention involves mixing a film material such as cellulose resin, and then using an extruder 1 to the first cooling roll from the casting die 4. 5 is melt-extruded onto the first cooling roll 5 and then circumscribed on the first cooling roll 5, and then further circumscribed on the three cooling rolls in total, the second cooling roll 7 and the third cooling roll 8, and then cooled and solidified to obtain a final 10 And
- the film 10 peeled off by the peeling roll 9 is then stretched in the width direction by gripping both ends of the film by the stretching device 12 and then wound by the winding device 16.
- a touch roll 6 is provided to clamp the molten film on the surface of the first cooling roll 5 in order to correct the flatness.
- the touch roll 6 has an elastic surface, and forms a two-piece with the first cooling roll 5. The details of Tatsuchi Roll 6! / Will be described later.
- the conditions for melt extrusion can be carried out in the same manner as those used for other thermoplastic resins such as polyester. It is preferable to dry the material in advance! Moisture of less than lOOOppm with vacuum or vacuum dryer or dehumidifying hot air dryer
- a cellulose ester resin dried under hot air, vacuum or reduced pressure is extruded.
- Use machine 1 to melt at an extrusion temperature of about 200 to 300 ° C and filter with a leaf disk type filter 2 to remove foreign matter.
- the extruder 1 When introducing into the extruder 1 from a supply hopper (not shown), it may be under an inert gas atmosphere under vacuum or reduced pressure to prevent the effects of oxygen and moisture, thereby preventing oxidative decomposition and the like. preferable.
- additives such as a plasticizer
- they may be kneaded in the middle of the extruder.
- a mixing device such as Static Mixer 3
- the cellulose resin and other additives such as a stabilizer added as necessary are mixed before melting. It is more preferable to mix the cellulose resin and the stabilizer first. Mixing may be performed by a mixer or the like, or may be performed in the cellulose resin preparation process as described above. When a mixer is used, a V-type mixer, a conical screw type mixer, a horizontal cylindrical type mixer, a Henschel mixer, or a ribbon mixer can be used.
- the mixture may be directly melted and formed into a film using the extruder 1, but once the film constituent materials are pelletized, The pellets may be melted by the extruder 1 to form a film.
- the film constituent material includes a plurality of materials having different melting points
- the powder containing the particles of each component constituting the pellet is once mixed and contained at a temperature at which only the low melting point material melts. It is also possible to produce a semi-molten product in which a part of the components are melted and particles or powders are bonded to each other, and the semi-molten product is put into the extruder 1 to form a film.
- the film component contains materials that are easily pyrolyzed, the film can be directly formed without producing pellets for the purpose of reducing the number of melting, A method of forming a film is preferred.
- the extruder 1 various commercially available extruders can be used.
- the extruder 1 may be a single-screw extruder or a twin-screw extruder, which is preferred as a melt-kneading extruder.
- a twin-screw extruder When forming a film directly without making pellets from film constituent materials, it is preferable to use a twin-screw extruder because an appropriate degree of kneading is necessary.
- a kneading type screw such as a mold, a unimelt type, or a dull mage, an appropriate kneading can be obtained, so that it can be used.
- pellets or braided semi-molten materials are used as the film constituent material, they can be used in either a single screw extruder or a twin screw extruder.
- the oxygen concentration is preferably lowered by substituting with an inert gas such as nitrogen gas or by reducing the pressure.
- the melting temperature of the film constituent material in the extruder 1 is a force that varies depending on the viscosity of the film constituent material, the discharge amount, the thickness of the sheet to be manufactured, and the like. On the other hand, it is Tg or more and Tg + 100 ° C or less, preferably Tg + 10 ° C or more and Tg + 90 ° C or less.
- the melt viscosity at the time of extrusion is 10 to 100000 boise, preferably ⁇ 100 to 10,000 boise.
- the residence time of the film constituting material in the extruder 1 is preferably shorter than 5 minutes, preferably within 3 minutes, more preferably within 2 minutes.
- the residence time depends on the type of extruder 1 and the extrusion conditions, but the material supply rate and screw length L / diameter D ratio L / D, screw rotation speed, screw groove depth It can be shortened by adjusting the above.
- the shape, rotation speed, and the like of the screw of the extruder 1 are appropriately selected depending on the viscosity of the film constituting material, the discharge amount, and the like.
- the shear rate in the extruder 1 is 1 / second to 1000 / second, preferably 5 / second to 1000 / second, more preferably 10 / second to 100 / second.
- the extruder 1 is generally available as a plastic molding machine.
- the film constituent material extruded from the extruder 1 is sent to the casting die 4 and extruded from the slit of the casting die 4 into a film shape.
- the casting die 4 is not particularly limited as long as it can be used to manufacture sheets and films.
- the material of the casting die 4 is sprayed or plated with hard chromium, chromium carbide, chromium nitride, titanium carbide, titanium carbonitride, titanium nitride, super steel, ceramic (tungsten carbide, aluminum oxide, chromium oxide), etc. Puff as surface processing, lapping using # 1000 or higher whetstone, #planar cutting using diamond whetstone # 1000 or higher (cutting direction is perpendicular to resin flow direction), electropolishing, electrolysis Processed with composite polishing Etc.
- a preferred material for the lip portion of the casting die 4 is the same as that of the casting die 4.
- the surface accuracy of the lip is preferably 0.5S or less, more preferably 0.2S or less.
- the slit of the casting die 4 is configured such that the gap can be adjusted. This is shown in Fig. 3. Of the pair of lips forming the slit 32 of the casting die 4, one is a flexible lip 33 having low rigidity and easily deformed, and the other is a fixed lip 34. A large number of heat bolts 35 are arranged with a constant pitch in the width direction of the casting die 4, that is, in the length direction of the slit 32.
- Each heat bolt 35 is provided with a block 36 having an embedded electric heater 37 and a cooling medium passage, and each heat bolt 35 penetrates each block 36 vertically.
- the base of the heat bolt 35 is fixed to the die body 31, and the tip is in contact with the outer surface of the flexible lip 33.
- the input of the embedded electric heater 37 is increased or decreased to raise or lower the temperature of the block 36, thereby causing the heat bolt 35 to thermally expand and contract, thereby displacing the flexible lip 33 and moving the film. Adjust the thickness.
- a thickness gauge is installed at the required location in the wake of the die, and the web thickness information detected thereby is fed back to the control device, and this thickness information is compared with the set thickness information by the control device. It is also possible to control the power or ON rate of the heating element of the heat bolt by the signal of the correction control amount that comes.
- the heat Bonoleto preferably has a length of 20 to 40 cm, a diameter of 7 to 14 mm, and is arranged in a plurality, for example, several tens of heat bolt forces, preferably a pitch of 20 to 40 mm.
- a gap adjusting member mainly composed of a bolt for adjusting the slit gap by manually moving back and forth in the axial direction may be provided.
- the slit gap adjusted by the gap adjusting member (usually 200 to 1000 mm, preferably (300 to 800 to 111, more preferably 400 to 600).
- the first to third cooling rolls are made of seamless steel pipe with a wall thickness of about 20 to 30 mm, and the surface is mirror finished. Inside, a pipe for flowing the coolant is arranged, and it is configured so that heat can be absorbed from the film on the roll by the coolant flowing through the pipe.
- the touch roll 6 in contact with the first cooling roll 5 has an elastic surface, and the first cooling roll 5 The pressing force applied to the roll 5 deforms along the surface of the first cooling roll 5 and forms a two-pipe with the first cooling roll 5.
- FIG. 4 shows a schematic cross section of one embodiment of the touch roll 6 (hereinafter, touch roll A).
- touch roll A has an elastic roller 42 disposed inside a flexible metal sleeve 41.
- the metal sleeve 41 is made of stainless steel having a thickness of 0.3 mm and has flexibility.
- the elastic roller 42 is formed in a roll shape by providing an elastic body 44 (rubber) on the surface of a metal inner cylinder 43 that is rotatable through a bearing.
- the elastic roller 42 presses the metal sleeve 41 against the first cooling roll 5, and the metal sleep 41 and the elastic roller 42 are connected to the first cooling roll 5. It deforms while conforming to the shape that fits the shape, and forms a dip between the first cooling roll. Cooling water 45 flows in a space formed between the elastic sleeve 42 inside the metal sleeve 41.
- Figs. 5 and 6 show a touch roll B which is another embodiment of the touch roll.
- the touch roll B includes a flexible, seamless stainless steel pipe (thickness 4 mm) outer cylinder 51, and a high-rigidity metal inner cylinder 52 arranged coaxially inside the outer cylinder 51. It is roughly composed of Coolant 54 flows in the space 53 between the outer cylinder 51 and the metal inner cylinder 52.
- the outer cylinder support flanges 56a and 56b are attached to the rotating shafts 55a and 55b at both ends, and the thin metal outer cylinder 5 1 is provided between the outer peripheral portions of the both outer cylinder support flanges 56a and 56b. Is installed.
- a fluid supply pipe 59 is disposed in the same axial center in a fluid discharge hole 58 that is formed in the axial center portion of one rotary shaft 55a and forms a fluid return passage 57.
- the pipe 59 is connected and fixed to a fluid shaft cylinder 60 arranged at the axial center portion in the thin metal outer cylinder 51.
- Inner cylinder support flanges 61a and 61b are attached to both ends of the fluid shaft cylinder 60, respectively, and between the outer peripheral parts of the inner cylinder support flanges 61a and 61b to the outer cylinder support flange 56b on the other end side.
- a metal inner cylinder 52 having a wall thickness of about 15 to 20 mm is attached.
- An outflow port 52a and an inflow port 52b are formed to communicate 53 with the intermediate passages 62a and 62b outside the inner cylinder support flanges 61a and 61b.
- the outer cylinder 51 is designed to be thin within a range in which the thin cylinder theory of elastic mechanics can be applied in order to have flexibility, flexibility, and resilience close to rubber elasticity.
- the flexibility evaluated by this thin-walled cylinder theory is expressed by the thickness t / roll radius r, and the smaller the t / r, the higher the flexibility.
- flexibility is the optimal condition when t / r ⁇ 0.03.
- This conversion value of 2mm ⁇ t ⁇ 5mm is 0.008 ⁇ t / r ⁇ 0.
- the touch rolls A and B are biased toward the first cooling roll by a biasing means (not shown). It is.
- the urging force of the urging means is F, and the value F / W (linear pressure) of the film in the nip excluding the width W in the direction along the rotation axis of the first cooling roll 5 is 9.8 to 147N Set to / cm.
- a nip is formed between the touch rolls A and B and the first cooling roll 5, and the flatness may be corrected while the film passes through the two nips. Therefore, the film is sandwiched for a long time with a small linear pressure compared to the case where the touch roll is made of a rigid body and no ep is formed between the first cooling roll and the flatness can be more reliably corrected. Can do. In other words, if the linear pressure is less than 9.8 N / cm, the die line cannot be sufficiently eliminated.
- the surfaces of the touch rolls A and B can be made smoother than when the surfaces of the touch rolls are rubber, so a film with high smoothness can be obtained. Obtainable.
- ethylene propylene rubber, neoprene rubber, silicon rubber or the like can be used as a material of the elastic body 44 of the elastic roller 42.
- the glass transition temperature of the cellulose ester film is Tg
- Tg glass transition temperature
- the 11th cooling / cooling roll 55, the 22nd cooling / rolling roll 77, and the preferred materials are carbon carbon steel, stainless steel, , Tree fats and oils, and the like. . Also, the accuracy of the surface surface is high and the surface roughness is not good. The surface roughness is less than 00..33SS or less. If you want to be more pleasing, you should be below 00 .. 0011SS. .
- the part of the 11th cooling and cooling roll 55 as it is is reduced to 7700kkPPaa or less Depending on where the pressure is applied, the above-mentioned correction effect of the daidairaline is large and can be kept favorable.
- the reduced pressure is from 5500 to 7700 kkPPaa.
- As a method of maintaining there is no particular limitation, but it is not possible to limit the area around the roll roll. There are methods such as covering with a member material, reducing pressure and reducing pressure. .
- the suction / inhalation device should not be the place where the device itself attaches to the sublimation objects. You can leave it like this by applying treatment such as heating and heating with a heater. . If the suction / suction pressure is too small, the sublimation products could not be effectively sucked / sucked. There is a need for pressure. .
- the castel dairy resin melted and melted in the form of a film-like celerulose-roseester-based resin resin is introduced into the eleventh cooling cooling outlet. Cooling is carried out while being transported and transported in close contact with the reel 55, the 22nd cooling / cooling roll 77, and the 33rd cooling / cooling roll 88. It is allowed to solidify to obtain an unstretched stretched film 1100 ((Ceseryl Loose Susesterl-based resin resin)). .
- the 33rd cooling cooling roll 88 is peeled off from the peeling roll 99 by the peeling roll 99.
- the film 1100 is an unstretched stretched film that has been separated by cooling, cooling, solidified, and unstretched stretched ((film film tension tension adjusting mouthpiece))
- the drawing and stretching machine 1122 After passing through 1111, it is led to the drawing and stretching machine 1122, where the film 1100 is drawn and stretched in the lateral direction ((width direction)). .
- the molecular molecules in the film are oriented. .
- the method of extending and extending the film film in the width direction is to use a publicly known tenter tarter or the like as desired. It can be done with. .
- the stacking layer with the polarized light film is actually implemented in a roll-shaped form, where the direction of the direction of elongation and extension is the direction of the width direction. Because it can be made in, you can leave it like it. .
- the cecellol looses sesterl series resin resin film
- the transmission axis of the polarizing film is also usually in the width direction.
- the display contrast of the liquid crystal display device can be increased and good A great viewing angle can be obtained.
- the glass transition temperature Tg of the film constituting material can be controlled by varying the kind of the material constituting the film and the ratio of the constituting material.
- Tg is preferably 120 ° C or higher, and more preferably 135 ° C or higher.
- the temperature environment of the film changes due to the temperature rise of the device itself, for example, the temperature rise from the light source.
- Tg of the film was lower than the ambient temperature of the film! /, And the retardation value derived from the orientation state of the molecules fixed inside the finale by stretching and the dimensional shape as the film. It will give a big change. If the Tg of the film is too high, the temperature of the film constituent material becomes high when the film is made into a film, so that the energy consumption for heating increases, and the material itself may be decomposed and colored due to the film formation. Therefore, Tg is preferably 250 ° C or lower.
- the stretching step known heat setting conditions, cooling, and relaxation treatment may be performed.
- the stretching step may be appropriately adjusted so as to have the characteristics required for the target optical film.
- the stretching step and the heat setting treatment are appropriately selected and performed.
- the heating and pressing step is performed before the stretching step and heat setting treatment.
- Stretching can be performed sequentially or simultaneously, for example, in the longitudinal direction of the film and in the direction perpendicular to the longitudinal direction of the film, that is, in the width direction. At this time, if the stretching ratio in at least one direction is too small, a sufficient phase difference cannot be obtained, and if it is too large, stretching becomes difficult and film breakage may occur.
- nx is the refractive index in the longitudinal MD direction
- ny is the lateral refractive index in the TD direction
- nz is the refractive index in the thickness direction.
- This distribution may appear when the tenter method is used.
- a contraction force is generated in the center of the film, and the end is fixed.
- This phenomenon is considered as the so-called Boeing phenomenon. Even in this case, by stretching in the casting direction, the bowing phenomenon can be suppressed and the distribution of retardation in the width direction can be reduced.
- the film thickness fluctuation of the resulting film can be reduced. If the film thickness variation of the retardation film is too large, the retardation will be uneven, and unevenness such as coloring may be a problem when used in a liquid crystal display.
- the film thickness variation of the cellulose ester film is preferably in the range of ⁇ 3%, more preferably ⁇ 1%.
- the method of stretching in the biaxial directions perpendicular to each other is effective, and the stretching ratio in the biaxial directions perpendicular to each other is finally 1.0 to 2.0 times in the casting direction.
- the width direction it is preferable to be in the range of 1.01-2.5 times, preferably in the casting direction from 1.01 to 1.5; in the range of 1.5 times in the width direction, 1.05-2.
- Retarde that is needed -It is more preferable to obtain a sion value.
- the transmission axis of the polarizer coincides with the width direction.
- the slow axis of the retardation film can be imparted in the width direction by stretching in the width direction from the above-described configuration. wear.
- the method of knurling can force the metal ring having a concavo-convex pattern on its side surface by heating or pressurizing. Note that the clip grips at both ends of the film are usually deformed and cannot be used as film products, so they are cut out and reused as raw materials.
- the film is wound while the shortest distance between the outer peripheral surface of the cylindrically wound film and the outer peripheral surface of the mobile transport roll immediately before this is kept constant. It is intended to be wound around.
- a means such as a static elimination blower for removing or reducing the surface potential of the film is provided.
- the winding device is a commonly used winding device that can be wound by a winding method such as a constant tension method, a constant torque method, a taper tension method, or a program tension control method with a constant internal stress. it can.
- the initial winding tension at the time of winding the cellulose ester film is preferably 90.2 to 30.8 N / m.
- the temperature is 20-30 ° C and the humidity is 20-60% RH. It is preferable to wind up the film.
- the resistance to humidity change in the thickness direction retardation (Rth) is improved.
- the temperature in the winding step is less than 20 ° C, it will be unsatisfactory because it will cause scratches and will not withstand practical use due to deterioration in film winding quality. If the temperature and force in the film winding process exceeds 00 ° C, it is not preferable because it causes a crack and cannot be practically used due to deterioration in film winding quality.
- the winding core may be of any material as long as it is a cylindrical core, but is preferably a hollow plastic core.
- the material include resins such as phenol resin, xylene resin, melamine resin, polyester resin, and epoxy resin, as long as they are heat resistant plastics that can withstand the heat treatment temperature.
- thermosetting resin reinforced with a filler such as glass fiber is preferable.
- a hollow plastic core a wound core made of FRP with an outer diameter of 6 inches (hereinafter, inch represents 2.54 cm) and an inner diameter of 5 inches is used.
- the number of windings on these winding cores is preferably 100 windings or more, more preferably 500 windings or more, and the winding thickness of 5 cm or more is preferred. It is preferable that the width of the film of the present invention is 1 to 5 m, particularly preferably 1.5 to 4 m.
- the clip gripping portions at both ends of the cut film are crushed or granulated as necessary, and used as film raw materials of the same type. Or may be reused as a raw material for films of different varieties.
- the cellulose ester film according to the present invention can be used as an optical film such as a polarizing plate protective film or a retardation film in a liquid crystal display device.
- the thickness of the polarizing plate protective film is 10-500 111 mashi. In particular 20 to; 150 111 force S. A particularly preferred range is 25 to 90 111. If the protective film for protecting the polarizing plate is thick, the polarizing plate after the polarizing plate processing becomes too thick, and it is not suitable for the thin and light purpose in the liquid crystal display used for the notebook type personal computer and the mopile type electronic device.
- the angle formed by the film forming direction is ⁇ 1
- ⁇ 1 is one;! ⁇ + 1 °, preferably 0
- the angle is 5 to + 0 ⁇ 5 °.
- it is preferably ⁇ 0 .;! To + 0.1 °.
- This ⁇ 1 can be defined as the orientation angle, and the measurement of ⁇ 1 is based on an automatic birefringence meter KOBRA-21AD
- Each of ⁇ 1 satisfying the above relationship contributes to obtaining high luminance in a display image, suppressing or preventing light leakage, and contributing to faithful color reproduction in a color liquid crystal display device.
- the method for producing the polarizing plate is not particularly limited, and it is determined by a general method, for example, a force produced by a roll-to-roll.
- the obtained cellulose ester film was treated with an alkali, and a polarizer prepared by immersing and stretching a polybulualcohol film in an iodine solution was used on both sides of the polarizer by using a completely cured polybulual alcohol aqueous solution.
- a method of laminating a polarizing plate protective film on both sides and the polarizing plate protective film of the present invention is directly pasted on a polarizer at least on one side.
- the cellulose ester film of the present invention is used as a polarizing plate protective film.
- the power to use is S.
- commercially available cellulose ester films manufactured by the solution casting method Koni force Minoltac KC8UX2M, KC4UX, KC5UX, KC4UY, KC8U Y, KC12UR, KC8UCR-3, KC8UCR-4, KC8UCR-5, KC4CR, KC4U E, KC8UE, KC8UY—HA, KC8UX—RHA (manufactured by Konica Minoltaput Co., Ltd.)), polyester film, cycloolefin-based resin film (Zeonor film (manufactured by Zeon Corporation), Arton film (manufactured by JSR Corporation)), etc.
- a film with a thickness of 10 to 150 Hm can also be used.
- an easy-adhesion process as described in JP-A-6-94915 and JP-A-6-118232 may be applied to perform polarizing plate processing, or corona discharge treatment. Or plasma treatment.
- the polarizing plate is composed of a polarizer and a polarizing plate protective film for protecting both sides of the polarizer, and further comprises a protective film on one surface of the polarizing plate and a separate film on the other surface.
- Power S can be.
- the protective film and the separate film are used for the purpose of protecting the polarizing plate when the polarizing plate is shipped, product inspection, etc.
- the protective film is bonded for the purpose of protecting the surface of the polarizing plate, and is used on the side opposite to the surface where the polarizing plate is bonded to the liquid crystal plate.
- the separate film is used for the purpose of covering the adhesive layer to be bonded to the liquid crystal plate, and is used on the side of the polarizing plate to be bonded to the liquid crystal cell.
- the polarizer which is the main component of the polarizing plate, is an element that passes only light having a plane of polarization in a certain direction, and a typical polarizer known at present is a polybula alcohol-based polarization. It is a film and is preferably used. This amount of poly Bulle alcohol or ethylene units;!. ⁇ 4 Monore 0/0, polymerization degree 2000 to 4000, Keni ⁇ 99. 0-99 such as ethylene-modified poly Bulle alcohol 99 Monore 0/0 There is a polybulal alcohol film dyed with iodine or dichroic dye.
- the polarizer is preferably a uniaxially stretched and dyed polybulal alcohol film, or a uniaxially stretched and then subjected to a durability treatment with a boron compound.
- a polarizing plate is formed by bonding one surface of a polarizing plate protective film on the surface of the polarizer. . It is preferably bonded with a water-based adhesive mainly composed of completely hatched polybulal alcohol.
- the film thickness of the polarizer is preferably 5 to 30 111.
- the cellulose ester film according to the present invention can be preferably used as a retardation film.
- the retardation film is used in the multi-domain VA mode, the retardation film is arranged in the above region with the fast axis of the retardation film as ⁇ 1 and contributes to the improvement of the display image quality.
- the polarizing plate and the liquid crystal display device are in the MVA mode, for example, the configuration shown in FIG. 7 can be adopted.
- Fig. 7 Lacquering, 21a, 21bi Protected Finolem, 22a, 22b Lacquering Difference Finolem, 25a, 25b are polarizers, 23a, 23b are the slow axis direction of the film, 24a, 24b are The direction of the transmission axis of the polarizer, 26a and 26b are polarizing plates, 27 is a liquid crystal cell, and 29 is a liquid crystal display device.
- the retardation Ro distribution in the in-plane direction of the cellulose ester film is preferably adjusted to 5% or less, more preferably 2% or less, and particularly preferably 1.5% or less. Further, the retardation Rth distribution in the thickness direction of the film is preferably adjusted to 10% or less, more preferably 2% or less, and particularly preferably 1.5% or less.
- the retardation film is adjusted to have a retardation value suitable for improving the display quality of the VA mode or TN mode liquid crystal cell, and is divided into the above multi-domain as the VA mode, and the MVA mode is obtained.
- it is required to adjust the in-plane retardation Ro to a value greater than 30 nm and 95 nm or less, and the thickness direction retardation Rth to a value greater than 70 ⁇ m and 400 nm or less.
- the above-mentioned in-plane retardation Ro is a method of using the display surface when the two polarizing plates are arranged in crossed Nicols and the liquid crystal cell is arranged between the polarizing plates, for example, in the configuration shown in FIG.
- the polarizing plate When it is in a crossed Nicol state with respect to when observing from the line direction, when it is observed obliquely from the normal line of the display surface, the polarizing plate deviates from the crossed Nicol state, which is a factor. Compensates mainly for light leakage.
- Retardation in the thickness direction is a combination of liquid crystal cells that are recognized when viewed from an oblique direction when the liquid crystal cell is in the black display state in the TN mode and VA mode, particularly in the MVA mode. Contributes mainly to compensate for refraction.
- both the in-plane retardation Ro and the thickness direction retardation Rth of 22a and 22b are the same. This is preferable in improving the productivity of industrial polarizing plates.
- the in-plane retardation Ro is greater than 35 nm and less than 65 nm
- the thickness direction retardation Rth is greater than 90 nm and less than 180 nm. Is to apply to.
- Use Ro with a thickness greater than 30 nm and less than or equal to 95 nm and a thickness direction retardation Rth greater than 140 nm and less than or equal to 400 nm. The display quality is improved, and this is preferable from the viewpoint of film production.
- a retardation film is required to obtain stable optical characteristics that the above-mentioned retardation value has little fluctuation in Ro or Rth.
- these fluctuations may cause image unevenness.
- the production effect obtained by the present invention becomes more prominent particularly in a long scroll of 100 m or more, and the longer the length is 1500 m, 2500 m, 5000 m, or 10000 m, the more the production effect of polarizing plate production becomes. obtain.
- a polarizing plate including the polarizing plate protective film according to the present invention (also serving as a retardation film)
- High display quality can be achieved as compared with ordinary polarizing plates, and it is particularly suitable for use in a multi-domain liquid crystal display device, more preferably a multi-domain liquid crystal display device by a birefringence mode.
- the polarizing plate of the present invention includes MVA (Multi-domein Vertical Alignment) mode, PV A (Patterned Vertical Alignment) mode, CPA (Continuous Pinwheel Alignment) mode, OCB (Optical Compensated Bend) mode, IPS mode, etc. This can be used, and is not limited to a specific liquid crystal mode and the arrangement of polarizing plates.
- Liquid crystal display devices are being applied as devices for colorization and moving image display. Display quality has been improved by the present invention, and contrast has been improved and durability of polarizing plates has been improved. It is possible to display a difficult and faithful moving image.
- one polarizing plate including the polarizing plate protective film according to the present invention is disposed with respect to the liquid crystal cell or the liquid crystal cell. Place two on both sides. At this time, the polarizing plate protective film side according to the present invention contained in the polarizing plate can be used so as to face the liquid crystal cell of the liquid crystal display device, thereby contributing to improvement in display quality.
- the films 22a and 22b face the liquid crystal cell of the liquid crystal display device.
- the polarizing plate protective film can optically compensate the liquid crystal cell.
- the polarizing plate of the present invention When the polarizing plate of the present invention is used in a liquid crystal display device, at least one polarizing plate of the polarizing plates of the liquid crystal display device may be the polarizing plate of the present invention.
- the polarizing plate of the present invention it is possible to provide a liquid crystal display device with improved display quality and excellent viewing angle characteristics.
- Example B of JP-A-6-501040 and adjust the amount of propionic acid, butyric acid, and acetic acid to adjust the amount of acetyl substitution, propionyl substitution, and petityl substitution.
- Six types of cellulose esters were synthesized as described above.
- C1 degree of substitution of acetyl group 1.30, degree of substitution of propionyl group 1.30, degree of substitution of total acyl group
- the weight average molecular weight was measured using high performance liquid chromatography.
- HEMA 2—Hydrochetyl methacrylate
- the cellulose ester C 1 was heat treated in dry air at 130 ° C. for 1 hour, and allowed to cool to room temperature in dry air. As shown in Tables 2, 3, 4, and 5, 8 parts by mass of the sugar ester compound, 4 parts by mass of the acrylic polymer, and 0.5 parts by mass of the antioxidant AO-1 based on 88 parts by mass of the dried cellulose resin Partly added and mixed, heated to 230 ° C using an extruder to produce a pellet and allowed to cool.
- the obtained pellets were dried at 80 ° C for 5 hours using a hot air dryer in which air was circulated to remove moisture.
- the pellets were melt extruded using a single screw extruder (Mitsubishi Heavy Industries, Ltd .: screw diameter 90 mm, T die lip material is tungsten carbide) having a coat hanger type T die with a lip width of 1.5 m.
- a single screw extruder Mitsubishi Heavy Industries, Ltd .: screw diameter 90 mm, T die lip material is tungsten carbide having a coat hanger type T die with a lip width of 1.5 m.
- Extrusion molding was performed in a clean room of class 10000 or less under molding conditions of a melting temperature of 250 ° C and a T-die temperature of 245 ° C.
- the resulting film was stretched 1.10 times in the longitudinal direction, and then stretched 1.20 times in the width direction using a tenter device, with a film thickness of 80 111 and a length of 30 00-m, 1.5-m wide Senorelose Estenorefinolem was obtained.
- a knurling process having a width of 1 cm and an average height of 8 ⁇ m was applied to both ends of the film and wound up, so that a cellulose ester film (polarizing plate protective film) sample 101 was produced.
- Samples 135 and 136 were further stretched to 1.20 times in the longitudinal direction and 1.70 times in the width direction, and changed to cellulose ester films having a film thickness of 40 ⁇ m.
- the additive amount of the additive was adjusted so that the total solid content in the film was 100. Additives that are liquid at room temperature were added by a feeder just before entering the twin screw extruder.
- additive and ultraviolet absorber used for sample preparation are as follows.
- X, ⁇ , and ⁇ ⁇ represent the tristimulus values of the light source color defined in JIS-Z8701.
- Retardations were measured at lcm intervals in the width direction of the obtained film sample and expressed by the coefficient of variation (CV) of the obtained retardation.
- CV coefficient of variation
- an automatic birefringence meter KOBU RA-21ADH manufactured by Oji Scientific Instruments Co., Ltd. was used. Three-dimensional birefringence measurement was performed.
- ⁇ Variation (CV) is 1.5% or more and less than 5%
- ⁇ Variation (CV) is 5% or more and less than 10%
- Retardation values under the different humidity conditions described below were determined for the produced polarizing plate protective film, and a variation value was determined as Rth (a) from the values.
- the sample was conditioned at 23 ° C and 20% RH for 5 hours, then the Rt value measured in the same environment was measured and set to Rth (b), and then the same film was continued at 23 ° C. After adjusting the humidity at 80% RH for 5 hours, the Rt value measured in the same environment was calculated and this was set as Rth (c), and Rth (a) was calculated from the following equation.
- Rth (a)
- the polarizing plate was prepared by performing the alkali saponification treatment described below. Next, the built-in contrast and viewing angle fluctuations in the liquid crystal display device were evaluated.
- a 120 ⁇ m-thick long roll polybulal alcohol film is immersed in 100 parts by mass of an aqueous solution containing 1 part by mass of iodine and 4 parts by mass of boric acid, and stretched in the transport direction 5 times at 50 ° C to form a polarizing film. Had made.
- VA-type liquid crystal display device manufactured by Fujitsu 15-inch display VL-150SD Remove the polarizing plate on the visible side and paste the polarizing plate P 10;! To P 156 prepared above on the sample 10;! To 156 side to the glass surface of the liquid crystal cell (VA type). Then, the liquid crystal display device 10 ;! to 156 was produced. At that time, the polarizing plate was bonded so that the absorption axis was in the same direction as the polarizing plate that had been bonded in advance.
- Measurement was performed after the backlight of each liquid crystal display device was lit continuously for one week in an environment of 23 ° C 55% RH.
- ELDIM EZ-Contrastl60D was used to measure the luminance from the normal direction of the white and black display screens using a liquid crystal display device, and the ratio was defined as the normal contrast.
- Front contrast (brightness of white display measured from normal direction of display device)
- the front contrast of any 5 points of the liquid crystal display device was measured and evaluated according to the following criteria:
- Front contrast is a variation of 0 to less than 5%, and unevenness is small
- Front contrast is 5 ⁇ ; variation is less than 10%, and there is some unevenness
- Front contrast is a variation of 10% or more, and the unevenness is large
- the liquid crystal display devices 101 to 153 of the present invention exhibit extremely stable display performance with no viewing angle fluctuations even under conditions in which the humidity of the liquid crystal display devices 154 to 156 fluctuates in front contrast. It was confirmed.
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020097010404A KR101409633B1 (ko) | 2006-11-25 | 2007-10-10 | 광학 필름의 제조 방법, 셀룰로오스 에스테르 필름, 편광판 및 액정 표시 장치 |
JP2008545333A JP4947058B2 (ja) | 2006-11-25 | 2007-10-10 | 光学フィルムの製造方法、セルロースエステルフィルム、偏光板および液晶表示装置 |
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JP2006-317875 | 2006-11-25 | ||
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WO2008062610A1 true WO2008062610A1 (fr) | 2008-05-29 |
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PCT/JP2007/069735 WO2008062610A1 (fr) | 2006-11-25 | 2007-10-10 | Procédé de fabrication de film optique, film d'ester de cellulose, polariseur et dispositif d'affichage à cristaux liquides |
Country Status (5)
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US (1) | US8158039B2 (ja) |
JP (1) | JP4947058B2 (ja) |
KR (1) | KR101409633B1 (ja) |
TW (1) | TWI431046B (ja) |
WO (1) | WO2008062610A1 (ja) |
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WO2009011228A1 (ja) * | 2007-07-19 | 2009-01-22 | Konica Minolta Opto, Inc. | セルロースエステルフィルム、セルロースエステルフィルムの製造方法、それを用いた偏光板、及び液晶表示装置 |
WO2009011229A1 (ja) * | 2007-07-19 | 2009-01-22 | Konica Minolta Opto, Inc. | セルロースエステルフィルム、セルロースエステルフィルムの製造方法、それを用いた偏光板保護フィルム、偏光板、及び液晶表示装置 |
JP2009286930A (ja) * | 2008-05-30 | 2009-12-10 | Konica Minolta Opto Inc | 光学フィルム、偏光板、及び液晶表示装置 |
JP2009300918A (ja) * | 2008-06-17 | 2009-12-24 | Konica Minolta Opto Inc | 位相差フィルム、位相差フィルムの製造方法、偏光板及び液晶表示装置 |
WO2010041513A1 (ja) * | 2008-10-06 | 2010-04-15 | コニカミノルタオプト株式会社 | 光学フィルム、光学フィルムの製造方法、偏光板および液晶表示装置 |
WO2010082411A1 (ja) * | 2009-01-15 | 2010-07-22 | コニカミノルタオプト株式会社 | 光学フィルム、偏光板、および液晶表示装置 |
WO2012124514A1 (ja) * | 2011-03-11 | 2012-09-20 | コニカミノルタアドバンストレイヤー株式会社 | セルロースエステルフィルム、それが具備された偏光板及び液晶表示装置 |
WO2013118566A1 (ja) * | 2012-02-08 | 2013-08-15 | コニカミノルタアドバンストレイヤー株式会社 | 光学フィルムの製造方法 |
JP2015168708A (ja) * | 2014-03-05 | 2015-09-28 | ダイセルポリマー株式会社 | セルロースエステル組成物 |
CN107699966A (zh) * | 2017-09-18 | 2018-02-16 | 浙江纺织服装职业技术学院 | 一种纤维素静电纺丝的方法 |
JP7104258B1 (ja) | 2022-03-02 | 2022-07-20 | 大阪ガスケミカル株式会社 | 樹脂組成物ならびにその用途および成形方法 |
WO2023148809A1 (ja) * | 2022-02-01 | 2023-08-10 | 株式会社ダイセル | セルロースアセテート組成物 |
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JP5342913B2 (ja) * | 2009-03-31 | 2013-11-13 | 富士フイルム株式会社 | グルコース化合物、セルロース組成物、セルロースフィルム、偏光板及び液晶表示装置 |
US20110319530A1 (en) | 2010-06-29 | 2011-12-29 | Eastman Chemical Company | Processes for making cellulose estate/elastomer compositions |
US9273195B2 (en) | 2010-06-29 | 2016-03-01 | Eastman Chemical Company | Tires comprising cellulose ester/elastomer compositions |
JP5501144B2 (ja) * | 2010-07-30 | 2014-05-21 | 富士フイルム株式会社 | セルロースエステルフィルム、偏光板、及び液晶表示装置 |
US20130150493A1 (en) | 2011-12-07 | 2013-06-13 | Eastman Chemical Company | Process for dispersing cellulose esters into elastomeric compositions |
US10077343B2 (en) | 2016-01-21 | 2018-09-18 | Eastman Chemical Company | Process to produce elastomeric compositions comprising cellulose ester additives |
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- 2007-10-10 WO PCT/JP2007/069735 patent/WO2008062610A1/ja active Application Filing
- 2007-10-10 KR KR1020097010404A patent/KR101409633B1/ko not_active IP Right Cessation
- 2007-10-15 US US11/974,545 patent/US8158039B2/en not_active Expired - Fee Related
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JP2006063169A (ja) * | 2004-08-26 | 2006-03-09 | Konica Minolta Opto Inc | セルロースエステルフィルム及びその製造方法、並びにそれを用いた偏光板及び液晶表示装置 |
JP2007169592A (ja) * | 2005-11-22 | 2007-07-05 | Fujifilm Corp | セルロースアシレートペレットおよびその製造方法、セルロースアシレートフィルムおよびその製造方法、偏光板、光学補償フィルム、反射防止フィルム、並びに液晶表示装置 |
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Also Published As
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JPWO2008062610A1 (ja) | 2010-03-04 |
KR20090086079A (ko) | 2009-08-10 |
KR101409633B1 (ko) | 2014-06-18 |
US20080122128A1 (en) | 2008-05-29 |
JP4947058B2 (ja) | 2012-06-06 |
US8158039B2 (en) | 2012-04-17 |
TW200835726A (en) | 2008-09-01 |
TWI431046B (zh) | 2014-03-21 |
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