WO2007138910A1 - 偏光板保護フィルム及びその製造方法、偏光板及びその製造方法、液晶表示装置 - Google Patents
偏光板保護フィルム及びその製造方法、偏光板及びその製造方法、液晶表示装置 Download PDFInfo
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- WO2007138910A1 WO2007138910A1 PCT/JP2007/060360 JP2007060360W WO2007138910A1 WO 2007138910 A1 WO2007138910 A1 WO 2007138910A1 JP 2007060360 W JP2007060360 W JP 2007060360W WO 2007138910 A1 WO2007138910 A1 WO 2007138910A1
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- film
- cellulose ester
- polarizing plate
- protective film
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- 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
- C08L1/14—Mixed esters, e.g. cellulose acetate-butyrate
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/44—Compression means for making articles of indefinite length
- B29C43/46—Rollers
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/52—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/16—Preparation of mixed organic cellulose esters, e.g. cellulose aceto-formate or cellulose aceto-propionate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/16—Preparation of mixed organic cellulose esters, e.g. cellulose aceto-formate or cellulose aceto-propionate
- C08B3/18—Aceto-butyrates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/02—Liquid crystal materials characterised by optical, electrical or physical properties of the components, in general
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/34—Feeding the material to the mould or the compression means
- B29C2043/3433—Feeding the material to the mould or the compression means using dispensing heads, e.g. extruders, placed over or apart from the moulds
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
- B29C33/04—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2001/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2001/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as moulding material
- B29K2001/08—Cellulose derivatives
- B29K2001/12—Cellulose acetate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/031—Polarizer or dye
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
Definitions
- the present invention relates to a polarizing plate protective film, a manufacturing method thereof, a polarizing plate and a manufacturing method thereof, and a liquid crystal display device using the polarizing plate.
- cellulose ester films are widely used as protective films for polarizing plates.
- Cellulose ester films are usually wound around a core to form a film, which is stored and transported.
- the solution casting method is a film forming method in which a solution obtained by dissolving cellulose ester in a solvent is cast to obtain a film shape, and then the solvent is evaporated and dried to obtain a film. Since a film formed by the solution casting method has high flatness, a high-quality liquid crystal display without unevenness can be obtained using this film.
- the solution casting method requires a large amount of an organic solvent and has a large environmental load.
- Cellulose ester film is formed using a solvent that has a large environmental impact due to its dissolution characteristics, and therefore, it is required to reduce the amount of solvent used. Increasing production is becoming difficult.
- Patent Documents 3 and 4 propose a method for producing a cellulose ester film using a melt casting film forming method.
- Patent Document 3 proposes a method of cooling molten resin by sandwiching it on an arc with a cooling roll and an endless belt that are kept at a uniform temperature in the width direction.
- Patent Document 4 proposes a method of cooling molten resin by sandwiching it between two cooling drums.
- a melt obtained by heating and melting cellulose resin has a high viscosity
- a film produced by the melt casting film forming method is inferior in flatness to a film formed by the solution casting film forming method. Specifically, die lines and uneven thickness are easily generated! / And! /
- a horse's back failure is a failure in which the original film is deformed into a U-shape like a horse's back and a belt-like convex part is formed at a pitch of about 2 to 3 cm near the center. Therefore, it is a problem because the surface looks distorted when it is covered with a polarizing plate.
- horse back failure has been reduced by lowering the coefficient of dynamic friction between the bases and adjusting the height of knurling on both sides.
- the core transfer is a failure due to film deformation due to the unevenness of the film.
- Patent Document 5 the inventor stated that the horse's spine failed because the core was bent by the film load.
- 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. 10-10321
- Patent Document 4 Japanese Patent Laid-Open No. 2002-212312
- Patent Document 5 JP 2002-3083 A
- the present invention has been made in view of the above problems, and an object of the present invention is to make a cellulose ester film that does not cause deformation failure of the original film, such as a horse back failure or a convex failure, even if stored for a long period of time. It is providing the polarizing plate protective film which used this, its manufacturing method, a polarizing plate, its manufacturing method, and the liquid crystal display device using this polarizing plate.
- R to R each represents a substituent.
- Rf represents a perfluoroalkyl group
- Rc represents an alkylene group
- Z represents a non-ionic polar group
- n represents 0 or 1
- m represents an integer of 1 to 3.
- At least one of the substituents represented by R to R is a hydrogen atom
- a polarizing plate comprising the polarizing plate protective film according to 5 above on at least one surface of a polarizer.
- a polarizing plate protective film using a cellulose ester film and the like It is possible to provide a manufacturing method, a polarizing plate, a manufacturing method thereof, and a liquid crystal display device using the polarizing plate.
- FIG. 1 is a schematic flow sheet showing one embodiment of an apparatus for carrying out a method for producing a cellulose ester film according to 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 cross-sectional view of the main part of the casting die.
- FIG. 5 is a cross-sectional view taken along a plane perpendicular to the rotation axis of the second embodiment of the pinching rotating body.
- FIG. 6 is a cross-sectional view in a plane including a rotation axis of a second embodiment of the pinching rotator.
- FIG. 7 is an exploded perspective view schematically showing a configuration diagram of a liquid crystal display device.
- FIG. 8 is a view showing a state of storage of a cellulose ester film original fabric.
- the present inventor has obtained a melt containing at least one selected from cellulose esters and compounds represented by the general formulas (1) to (3).
- a method for manufacturing a polarizing plate protective film in which a long cellulose ester film is formed by a melt casting method and wound up in a roll shape even if it is stored for a long period of time, a horse's back failure or convex failure can It has been found that a method for producing a polarizing plate protective film that does not cause deformation failure can be obtained, and the present invention has been achieved.
- the best mode for carrying out the present invention will be described in detail below, but the present invention is not limited thereto.
- a compound having a partial structure that causes hydrogen bonding with a cellulose ester by a fluorine atom it is preferable to contain a compound having a partial structure that causes hydrogen bonding with a cellulose ester by a fluorine atom.
- a compound having a partial structure that generates hydrogen bonding by a fluorine atom means an electronegative atom (in the present invention, a fluorine atom) and hydrogen in cellulose ester as shown below.
- the hydrogen bond generated between the atoms brings the compound having a partial structure causing hydrogen bonding of the present invention into proximity with the cellulose ester, and the hydrogen atom adjacent to the fluorine atom and the electronegative atom in the cellulose ester ( In the present invention, it means a compound having a partial structure in which hydrogen bonds are generated between oxygen atoms) and molecules can be arranged.
- the melting temperature of the composition can be lowered.
- the viscosity of the composition containing a hydrogen bonding compound can be lowered than that of cellulose ester.
- the method for producing a polarizing plate protective film of the present invention is a method for producing a polarizing plate protective film comprising a roll-like long cellulose ester film, wherein the cellulose ester film is represented by the general formulas (1) to (1). It is characterized by containing the compound represented by (3).
- R to R represent a substituent.
- Examples of the substituent include a hydrogen atom, a halogen atom (for example, a fluorine atom, a chlorine atom), an alkyl group (for example, a methyl group, an ethyl group, an isopropyl group, a hydroxyethyl group, a methoxymethyl group, trifluoromethyl).
- a hydrogen atom for example, a hydrogen atom, a halogen atom (for example, a fluorine atom, a chlorine atom), an alkyl group (for example, a methyl group, an ethyl group, an isopropyl group, a hydroxyethyl group, a methoxymethyl group, trifluoromethyl).
- a halogen atom for example, a fluorine atom, a chlorine atom
- an alkyl group for example, a methyl group, an ethyl group, an isopropyl group, a hydroxyethyl group
- cycloalkyl group for example, cyclobenzyl 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.
- Aryloxy groups eg phenoxy groups
- cyano groups eg acetylamino groups, propionylamino groups etc.
- alkylthio groups eg methylthio groups, ethylthio groups, butylthio groups etc.
- arylthio groups For example, phenylthio group
- sulfo-lumino group eg, methanesulfo-lumino group, benzenesulfo-lumino group, etc.
- urea group eg, 3-methylureido group, 3,3-dimethylureido group, 1, 3— Dimethylureido group, etc.
- sulfamoylamino group dimethylsulfamoylamino group etc.
- strong rubamoyl group eg methylcarbamoyl group, ethylcarbamoyl group, dimethylcarbamoyl group etc
- At least one of R to R represents a substituent containing a hydrogen atom.
- At least one of R to R is a hydrogen atom.
- the substituted substituent is preferable because the effect of decreasing the melt viscosity is high.
- R to R represent a substituent.
- Examples of the substituent 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, trifluoromethyl).
- a hydrogen atom for example, 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, trifluoromethyl).
- cycloalkyl group for example, cyclobenzyl 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.
- Aryloxy groups eg phenoxy groups
- cyano groups eg acetylamino groups, propionylamino groups etc.
- alkylthio groups eg methylthio groups, ethylthio groups, butylthio groups etc.
- arylthio groups For example, phenylthio group
- sulfo-lumino group eg, methanesulfo-lumino group, benzenesulfo-lumino group, etc.
- urea group eg, 3-methylureido group, 3,3-dimethylureido group, 1, 3— Dimethylureido group etc.
- sulfamoylamino group dimethylsulfamoylamino group etc.
- carbamoyl group eg methylcarbamoyl group, ethylcarbamoyl group, dimethylcarbamoyl group etc.
- R and R, R to R are connected to each other to form a ring.
- At least one of the substituents represented by R to R is substituted with a hydroxy group or a hydroxy group
- Rf represents a perfluoroalkyl group
- Rc represents an alkylene group
- Z represents a non-ionic polar group
- n represents 0 or 1
- m represents an integer of 1 to 3.
- Rf preferably represents a perfluoroalkyl group having 3 to 20 carbon atoms.
- Rf may be a mixture of a plurality of compounds having perfluoroalkyl groups having different chain lengths, or a compound having a single perfluoroalkyl group. May be.
- the average chain length of the perfluoroalkyl groups may be 4 to 10 carbon atoms. 4 to 9 is particularly preferable.
- Rc represents an alkylene group.
- the alkylene group has 1 or more carbon atoms, but preferably 2 or more, more preferably 20 or less.
- methylene group, ethylene group, 1,2-propylene group, 1,3-propylene group, 1,2-butylene group, 1,4-butylene group, 1,6-hexylene group, 1,2- Examples include an octylene group.
- n represents an integer of 0 or 1, and is preferably 1.
- m represents an integer of 1 to 3, and is preferably ml.
- Z represents a nonionic group necessary for imparting surface activity, and if this group is included! /,
- the method of linking to Rc is not particularly limited.
- nonionic polar group necessary for imparting surface activity examples include a polyoxyalkylene group, a polyhydric alcohol group, and the like, preferably polyethylene glycol, polypropylene.
- a polyoxyalkylene group such as render recall.
- the terminal of these groups may be a group other than a hydrogen atom, for example, an alkyl group.
- Rf is preferably a perfluoroalkyl group having 4 to 16 carbon atoms, and more preferably a perfluoroalkyl group having 6 to 16 carbon atoms.
- Rc is preferably an unsubstituted alkylene group having 2 to 16 carbon atoms, more preferably an unsubstituted alkylene group having 2 to 8 carbon atoms, and particularly preferably an ethylene group.
- the Rc group and the group necessary for imparting the surface activity may be directly connected in any way, or may be bonded by, for example, an alkylene chain, arylene, etc., and these groups are substituted. It may have a group.
- these groups may contain an oxy group, a thio group, a sulfonyl group, a sulfoxide group, a sulfonamide group, an amide group, an amino group, a carboxylic group, or the like in the main chain or the measured chain.
- fluorine-based surfactants are used in solution casting film formation. These are improvements in the peelability of cast die, lower surface tension, coating agents in organic solvents, or bands. It is used for the purpose of preventing electricity and does not suggest the present invention.
- the additive amount of the compounds represented by the general formulas (1) to (3) is preferably 0.1 to 10% by mass, and more preferably 0.2 to 5% by mass. It is more preferable to add 0.5 to 2% by mass.
- the compounds represented by (1) to (3) may be used alone or in combination of two or more.
- the cellulose ester film used in the present invention is produced by a melt casting method.
- the melt casting method is a method of forming a film by casting a melt (melt) of cellulose ester on a support.
- the melt casting method can significantly reduce the amount of organic solvent used in film production, and therefore the environmental suitability has been greatly improved compared to the solution casting method that uses a large amount of conventional organic solvents. Melt because film is obtained It is preferable to produce a cellulose ester film by the casting method.
- the melt casting in the present invention is a method in which a cellulose ester is heated and melted to a temperature showing fluidity without using a solvent, and a film is formed using this, for example, a fluid cellulose ester.
- This is a method for forming a film by extruding the die.
- a solvent may be used in a part of the process for preparing the molten cellulose ester, in the melt film-forming process in which the film is formed into a film, the molding is substantially performed without using any solvent.
- the cellulose ester constituting the optical film is not particularly limited as long as it is a meltable film-forming cellulose ester.
- an aromatic carboxylic acid ester or the like may be used, but the optical properties and the like of the film obtained can be obtained.
- the lower fatty acid in the lower fatty acid ester of cellulose means a fatty acid having 5 or less carbon atoms, such as cellulose acetate, senorelose propionate, senorelose butyrate, senorelose spinorate, etc. Are preferred as lower fatty acid esters of cellulose.
- Cellulose esters substituted with fatty acids having 6 or more carbon atoms have good melt film-forming properties, but the resulting cellulose ester film has low mechanical properties and is therefore difficult to use as an optical film. It is.
- mixed fatty acid esters such as cellulose acetate propionate and cellulose acetate butyrate may be used.
- Triacetyl cellulose which is a cellulose ester generally used in solution casting film formation, cannot be used for melt film formation because it is a cellulose ester having a decomposition temperature higher than the melting temperature.
- the cellulose ester constituting the cellulose ester film is a cellulose ester having an aliphatic acyl group having 2 or more carbon atoms, and the cellulose ester has a total acyl group carbon number of 6.2 to 7. 5 is a cellulose ester.
- the total number of acyl groups of cellulose ester is preferably 6.5 to 7.2, and more preferably 6.7 to 7.1.
- the total number of carbons of the acyl group is the sum of the products of the substitution degree of each acyl group in the cellulose ester and the number of carbon atoms.
- the number of carbon atoms of the aliphatic acyl group is preferably 2 to 6 from the viewpoint of cellulose synthesis productivity and cost. It should be noted that In other words, the moiety usually exists as a hydroxyl group. These can be synthesized by known methods.
- Examples of the acyl group include acetyl group, propionyl group, butyryl group, pentanate group, and hexanate group.
- Examples of the cellulose ester include cellulose propionate, cellulose butyrate, and cellulose pentanate. It is done. Further, mixed fatty acid esters such as cellulose acetate propionate, cellulose acetate butyrate, and cellulose acetate pentanate may be used as long as the above-mentioned side chain carbon number is satisfied. Of these, cellulose acetate propionate and cellulose acetate butyrate are particularly preferred. Triacetyl cellulose and diacetyl cellulose which are cellulose esters generally used in solution casting film formation are not included in the present invention because they do not satisfy the condition of the number of side chain carbon atoms.
- the mechanical properties and saponification properties of a cellulose ester film and the melt film-forming properties of the cellulose ester are in a trade-off relationship with respect to the total substitution degree of the acyl group of the cellulose ester.
- the mechanical properties are lowered and the melt film-forming property is improved.
- the cellulose ester used in the present invention is one having a weight average molecular weight MwZ number average molecular weight Mn ratio of 1.0 to 5.5, particularly preferably 1.4 to 5.0, and more preferably. Or 2. 0 to 3.0. Mw is preferably 100,000 to 500,000, and more preferably 150,000 to 300,000.
- the average molecular weight and molecular weight distribution of the cellulose ester are determined by high performance liquid chromatography. And can be measured by a known method. Using this, the number average molecular weight and the weight average molecular weight are calculated. The measurement conditions are as follows.
- the raw material cellulose of the cellulose ester used in the present invention may be wood pulp or cotton linter.
- Wood pulp may be softwood or hardwood, but softwood is more preferable.
- Cotton linter is also preferably used for the peelable point force during film formation. Cellulose esters made from these can be mixed as appropriate, and can be used alone.
- the ratio of cellulose ester derived cellulose ester: cellulose pulp (coniferous) cellulose ester: wood pulp (hardwood) derived cellulose ester is 100: 0: 0, 90: 10: 0, 85: 15: 0, 50 : 50: 0, 20: 80: 0, 10: 90: 0, 0: 100: 0, 0: 0: 100, 80:10:10, 85: 0: 15, 40:30:30 it can.
- the cellulose ester is prepared by, for example, acetic anhydride, propionic anhydride and ⁇ or butyric anhydride for the hydroxyl group of the raw material cellulose by a conventional method using a acetyl group, propiol group and
- the method for synthesizing such a cellulose ester is not particularly limited. For example, it can be synthesized with reference to the method described in JP-A-10-45804 or JP-A-6-501040.
- the degree of substitution of an acyl group such as an acetyl group, a propiol group, or a butyl group can be measured according to ASTM-D81 7-96.
- cellulose esters are synthesized using sulfuric acid as a catalyst. This sulfuric acid is not completely removed, and the residual sulfuric acid is obtained by causing various decomposition reactions during melt film formation.
- the residual sulfuric acid content in the cellulose ester used in the present invention is in the range of 0.1 to 40 ppm in terms of elemental sulfur. These are considered to be contained in the form of salts. If the residual sulfuric acid content exceeds Oppm, deposits on the die lip during heat melting increase, which is not preferable. In addition, it is not preferable because it tends to break during slitting after hot drawing or after hot drawing. Less is preferred
- the burden of the washing step of the cellulose ester becomes too large. This may increase the number of washings, which may affect the fat and oil. Furthermore, the range of 0.1-30 ppm is preferable.
- the residual sulfuric acid content can be similarly measured by ASTM-D8 17-96.
- the total residual acid amount including other residual acids is preferably 10 ppm or less, more preferably 500 ppm or less, and even more preferably 10 ppm or less.
- the residual acid content can be within the above range, and the melt casting method can be achieved.
- adhesion to the lip is reduced and a film with excellent flatness is obtained, and a film with favorable dimensional change, mechanical strength, transparency, moisture resistance, Rt value, and Ro value is obtained.
- cellulose ester can be washed with a poor solvent such as methanol or ethanol, or as a result, a mixed solvent of a poor solvent and a good solvent can be used. , Low molecular organic impurities can be removed.
- the cellulose ester is preferably washed in the presence of a hindered amine, a phosphite, and an antioxidant, which improves the heat resistance and film-forming stability of the cellulose ester.
- the cellulose ester is dissolved in a good solvent of cellulose ester and then reprecipitated in the poor solvent to remove low molecular weight components and other impurities of the cellulose ester. Can be removed. At this time, the aforementioned cellulose Like the washing of the ester, it is preferable to perform in the presence of an antioxidant.
- the intrinsic viscosity of the cellulose ester is 1.5 to 1. In 75GZcm 3 is preferred gestures et 1. 53 to 1. Scope of 63GZcm 3 are preferred.
- the cellulose ester used in the present invention preferably has few bright spot foreign matters when formed into a film.
- a bright spot foreign material is a polarizing plate with two polarizing plates arranged at right angles (crossed Nicols).
- a cellulose ester film is placed between them. The light from the light source is applied from one side, and the cellulose ester film is placed from the other side. This is the point where the light from the light source appears to leak when observed.
- the polarizing plate used for the evaluation is preferably a glass plate used for protecting the polarizer, which is desirably composed of a protective film free from bright spot foreign matter.
- One of the causes of bright spot foreign matter is cellulose that is not acetylated or low acetylated in the cellulose ester.
- Use cellulose ester with a small amount of bright spot foreign matter (use a cellulose ester with a small degree of dispersion).
- at least one of the process of filtering the melted cellulose ester and the process of obtaining the cellulose ester at a later stage and the process of obtaining the precipitate, once in the solution state, the bright spot foreign matter is similarly removed via the filtration process. You can also Since the molten resin has a high viscosity, the latter method is more efficient.
- 100 / cm 2 or less is more preferable 50 / cm 2 or less is more preferable 30 / cm 2 or less is even more preferable 10 / cm 2 More preferably, it is most preferably none.
- 0. 005-0. 200 / cm 2 or less it is preferred instrument 100 / cm 2 can be 50 forces Ri preferred instrument is ZCM 2 or less or less is also Olmm following bright spot Even more preferred is 30 pieces Zcm 2 or less, even more preferred is 10 pieces / cm 2 or less, but it is none at all. And are most preferred.
- a cellulose ester composition in which a plasticizer, an anti-degradation agent, an anti-oxidation agent, etc. are added and mixed rather than filtering a melted cellulose ester alone. Filtration of substances is preferred because of its high removal efficiency of bright spots. Of course, it may be dissolved in a solvent during the synthesis of cellulose ester and reduced by filtration. What mixed the ultraviolet absorber and other additives suitably can be filtered. Filtration is preferably such that the melt containing the cellulose ester has a viscosity of 10000P or less, preferably 5000P or less, more preferably 1000P or less, and even more preferably 500P or less.
- the filter medium conventionally known materials such as glass fiber, cellulose fiber, filter paper, and fluorine resin such as tetrafluoroethylene resin are preferably used, and ceramics, metals, and the like are particularly preferably used.
- the absolute filtration accuracy is preferably 50 m or less, more preferably 30 / z m or less, more preferably 10 / z m or less, and even more preferably 5 m or less. These can be used in combination as appropriate.
- the filter medium can be used in either a surface type or a depth type. The 1S depth type is preferably used because it is relatively less clogged.
- a cellulose ester obtained by dissolving the raw material cellulose ester in a solvent at least once and then drying the solvent may be used.
- a cellulose ester that has been dissolved in a solvent together with at least one of a plasticizer, an ultraviolet absorber, a deterioration inhibitor, an antioxidant, and a matting agent and then dried is used.
- a good solvent used in a solution casting method such as methylene chloride, methyl acetate, or dioxolane can be used, and a poor solvent such as methanol, ethanol, or butanol may be used at the same time.
- it may be cooled below 20 ° C or heated above 80 ° C.
- the optical properties may be uniformed by uniformly blocking each additive when melted.
- the method for producing a polarizing plate protective film of the present invention may be a method in which polymer components other than cellulose ester are appropriately mixed.
- the polymer component to be mixed is preferably 80% or more, more preferably 90% or more, and still more preferably 92% or more when a film having a good compatibility with the cellulose ester is used. .
- ⁇ Antioxidant> ⁇ Antioxidant>
- the cellulose ester is decomposed not only by heat but also by oxygen, in the method for producing a polarizing plate protective film of the present invention, it is preferable to contain an anti-oxidation agent as a stabilizer.
- the cellulose ester is washed in the presence of an acid inhibitor when it is suspended and washed with a poor solvent.
- the antioxidant to be used is a compound that inactivates radicals generated in the cellulose ester or suppresses deterioration of the cellulose ester caused by oxygen added to the radical generated in the cellulose ester. Can be used without limitation.
- the anti-oxidation agent used for the suspension washing of the cellulose ester may remain in the cellulose ester after washing.
- the remaining amount is from 0.01 to 2000 ppm, and more preferably from 0.05 to LOOOppm. More preferably, 0.1 to: LOOppm.
- any compound can be used without limitation as long as it is a compound that suppresses deterioration of the cellulose ester film molding material due to oxygen.
- examples thereof include phenolic compounds, hindered amine compounds, phosphorus compounds, heat-resistant processing stabilizers, benzofuranone compounds, heat-resistant processing stabilizers, oxygen strength agents, etc.
- Compounds, phosphorus compounds, and benzofuranone compounds are preferred. By combining these compounds, it is possible to prevent coloring and strength reduction of the molded product due to heat, thermal oxidative degradation, etc. without reducing transparency and heat resistance.
- These antioxidants can be used alone or in combination of two or more.
- Phenolic compounds are known compounds and are described, for example, in columns 12-14 of US Pat. No. 4,839,405, and include 2,6-dialkylphenol derivative compounds. Among such compounds, preferred compounds are represented by the following general formula (A). Are preferred.
- R 1 to R 4 represent a substituent.
- Substituents include hydrogen and halogen atoms (for example,
- alkyl group eg methyl group, ethyl group, isopropyl group, hydroxyethyl group, methoxymethyl group, trifluoromethyl group, t-butyl group, etc.
- cycloalkyl group eg, Cyclopentyl group, cyclohexyl group, etc.
- aralkyl group eg, benzyl group, 2-phenethyl group, etc.
- aryl group eg, phenyl group, naphthyl group, p
- An acylamino group for example, acetylamino group, propio-lamino group, etc.
- an alkylthio group for example, methylthio group, ethylthio group, butylthio group, etc.
- an arylthio group for example, phenylthio group, etc.
- a sulfo-lamino group for example, methanesulfo-lamino group) Group, benzenesulfo-lumino group, etc.
- ureido group eg 3-methylureido group, 3,3-dimethylureido group, 1,3-dimethylureido group, etc.
- sulfamoylamino group (dimethylsulfamoylamino) Groups), strong rubamoyl groups (for example, methylcarbamoyl group, ethylcarbamoyl group, dimethylcarbamoyl group
- benzene disulfide groups benzothia Zolilu 2-disulfide group, etc.
- carboxyl group sulfo group
- heterocyclic group eg, pyrrole group, pyrrolidyl group, pyrazolyl group, imidazolyl group, pyridyl group, benzimidazolyl group, benzthiazolyl group, benzoxazolyl group, etc.
- phenolic compounds in which R is a hydrogen atom and R and R are t-butyl groups are preferred.
- phenolic compounds include n-octadecyl 3- (3,5-tert-butyl 4-hydroxyphenol) propionate, n-octadecyl 3- (3,5-di-tert-butyl-4-hydroxyphenol- 1) Acetate, n-octadecyl 3,5-di-tert-butyl 4-hydroxybenzoate, n-hexyl 3,5-di-tert-butyl 4-hydroxyphenezoate, n-dodecyl 3,5-di-t —Butyl 4-hydroxyphenyl benzoate, neo-dodecyl 3— (3,5-di-t-butyl-4-hydroxyphenol) propionate, dodecyl j8 (3,5-di-t-butyl—4— hydroxy Hue - Le) prop Oneto, Echiru alpha - (4-hydroxy 3, 5-di-t Buchirufue - Le) Isobuchire
- a hindered amine compound represented by the following general formula (B) is preferred.
- R 1 to R 4 represent a substituent.
- the substituent is represented by R to R in the general formula (A).
- R 21 27 11 16 are the same as those described above.
- R is a hydrogen atom, methyl group, R is a hydrogen atom, R 1, R 2, R 3, R is preferably a methyl group.
- hindered amine compounds include bis (2, 2, 6, 6-tetramethyl-4-piperidyl) sebacate, bis (2, 2, 6, 6-tetramethyl-4-piperidyl) succinate, bis (1, 2, 2, 6, 6 Pentamethyl-4-piperidyl) sebacate, bis (N-otatoxy 2, 2, 6, 6-tetramethyl 1-4 piperidyl) sebacate, bis (N-benzyloxy 2, 2, 6, 6-tetra Methyl-4-piperidyl) sebacate, bis (N cyclohexyloxy-2,2,6,6-tetramethyl-4-piperidyl) senocate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) 2 — (3,5 di-t-butyl 4-hydroxybenzyl) -2 butyl malonate, bis (1-acroyl-2,2,6,6-tetramethyl-4-piperidyl) 2,2bis (3,5 di-t —Butyl 4-hydroxybenzy
- polymer type compounds include N, ⁇ ',,, ⁇ ' — Tetrakis [4, 6 bis [butyl- ( ⁇ -methyl-2, 2, 6, 6-tetra Methylpiberidine—4-yl) amino] —triazine—2-yl] —4, 7 diazadecane— 1,10 diamine, dibutinoreamine and 1, 3, 5 triazine ⁇ , N 'bis (2, 2 , 6, 6-Tetramethinole 4-piperidyl) -1, 6 Hexamethylenediamine and ⁇ — (2, 2, 6, 6-tetramethyl 4-piperidyl) butyramine, dibutylamine and 1, 3, 5 Polycondensate of triazine with ⁇ , N 'bis (2, 2, 6, 6-tetramethyl-4-piperidyl) butyramine, poly [ ⁇ (1, 1, 3, 3-tetramethylbutyl) amino-1, 3, 5 triazine 2, 4 Gil ⁇ ⁇ (2, 2, 6, 6,
- Mn number average molecular weight
- Hindered phenol compounds of the above type are, for example, Ciba Specialty
- Ph and P represent a substituent. As a substituent, it may have a substituent.
- Ph and P represent a phenylene group, and the hydrogen atom of the phenylene group.
- Ph and P may be the same or different.
- X is a single bond, sulfur
- R is a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or
- Ph and P are a phenyl group or
- 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, an alkyl cycloalkyl group having 6 to 12 carbon atoms, or It may be substituted with an aralkyl group having 7 to 12 carbon atoms.
- R 2 2 may be the same or different.
- R to R in the general formula (A).
- the substituent may be substituted with the same substituent as the substituent represented.
- Ph represents a substituent.
- the substituent is represented by R to R in the general formula (A).
- Ph represents a phenyl group or a biphenyl group
- 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, an alkylcycloalkyl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms. May be substituted. Further, these are R to R in the general formula (A).
- Ph represents a substituent.
- the substituent is represented by R to R in the general formula (A).
- Ph is an alkyl group having 1 to 20 carbon atoms or phenol.
- the alkyl group or the fluorine group is represented by R to R in the general formula (A).
- Ph, Ph 'and Ph represent substituents.
- substituents include those in the general formula (A).
- Ph, Ph ⁇ and Ph g are charcoal.
- 11 16 5 5 5 represents an alkyl group or a full group having a prime number of 1 to 20, and the alkyl group or the full group May be substituted with a substituent having the same meaning as the substituent represented by R to R in the general formula (A).
- the phosphorus compound include triphenylphosphite, diphenylisodecylphosphite, phenoldiisodecylphosphite, tris (norphenol) phosphite, tris (dinolephenol) phosphite, Tris (2,4 di-tert-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-Hydroxy-5-methylphenol) propoxy] 2, 4, 8, 10-Tetra-tert-butyldibenz [d, f] [l.
- Dioxa Monophosphite compounds such as phosphepine and tridecyl phosphite; 4, 4'-butylidenebis (3-methyl-6-t-butylfe-ruthy tridecylphosphite), 4, 4'-isopropylidene-bis ( Hue -Diphosphite compounds such as di-alkyl (C12-C15) phosphite); Triphenyl phosphonite, tetrax (2, 4 di-tert-butylphenol) [1, 1-biphenyl] — 4, 4 '—Diylbisphosphonite, tetrakis (2, 4 di tert butyl-5 methylphenol) [1, 1-biphenyl] —4, 4' —phosphonite compounds such as dilbisphosphonite; triphenylphosphinite, 2, 6 Phosphinite compounds such as dimethylphenol diphosphine phosphinite; phosphine
- Phosphorus compounds of the above type are, for example, “Sumilizer GP” from Sumitomo Chemical Co., Ltd., ADK STAB PEP—24G ”,“ ADK STAB PE P—36 ”and“ Asahi Denka Kogyo Co., Ltd. ” ADK STAB 3010 ”,“ IRGAFOS P—EPQ ”from Chinoku“ Specialty ”Chemicals, Inc. and“ GSY—P101 ”from Sakai Chemical Industry Co., Ltd.
- a thio-based compound represented by the following general formula (D) is preferable as one of the useful antioxidants.
- R and R each represent a substituent.
- R to R in the general formula (A) R to R in the general formula (A)
- thio compounds include dilauryl 3,3-thiodipropionate and dimyris. Chill 3,3'-thiodipropionate, distearyl 3,3-thiodipropionate, lauryl stearyl 3,3-thiodipropionate, pentaerythritol tetrakis (j8-lauryl thiopropionate), 3, 9 Bis (2 dodecylthioethyl) 2, 4, 8, 10 Tetraoxaspiro [5, 5] undecane and the like.
- benzofuranone-based compound described in JP-A-7-233160 and JP-A-7-247278 is preferred.
- Specific examples of benzofuranone compounds include 5, 7—G 6—611-3— (2,5 Dimethylphenol) 3H—Benzofuran-2-one, 3— (3,4 Dimethylphenol) 5, 7 Dione tert— Bu— 3H Benzofuran 2—one, 5, 7 Dione tert— Bu— 3— (4 —ethyl chloride) 1 3H Benzofuran 1—one, 5, 7 Dione tert— Bu— 3 — (2, 3, 4, 5, 6 Pentamethylphenyl) 1 3 ⁇ Benzofuran 1-one, 5, 7 Di 1 t ert-Bu- 3- (4-Methylthiophenyl) 3H Benzofuran 1— ON, 5, 7 Di —tert— Bu— 3— (4 Methylphenol) 3H Benzofuran 2 ON.
- heat-resistant cache stabilizers examples include 2-t-butynole 6- (3-t-butyl 2-hydroxy-5-methylbenzyl) 4-methylphenol acrylate, 2- [1 — (2 Hydroxy-3,5-di-t-pentylphenol) ethyl] -4,6-di-t-pentylphenol acrylate.
- the above types of heat-resistant processing stabilizers are commercially available from Sumitomo Chemical Co., Ltd. under the trade names “Sumilizer GM” and “Sumilizer GS”.
- the anti-oxidation agent removes impurities such as residual acid, inorganic salt, and low-molecular-weight organic matter that are carried over during production or that are generated during storage. More preferably, the purity is 99% or more. Residual acid and water are preferably 0.01-100 ppm, and it is possible to suppress thermal degradation and improve film formation stability, optical properties, and mechanical properties when melt-forming cellulose esters. To do.
- Antioxidant is 0.1 ⁇ : It is preferable to add L0% by mass. It is preferable to add 0.5 to 2% by mass. Two or more of these may be used in combination.
- the addition amount of the antioxidant is too small, the stabilizing effect is low at the time of melting, so the effect is not obtained, and if the addition amount is too large, the viewpoint of the compatibility with the cellulose ester is not sufficient. This is not preferable because the transparency of the film is reduced and the film may become brittle.
- the method for producing a polarizing plate protective film of the present invention should contain an acid scavenger as a stabilizer. Is preferred ⁇ .
- Any acid scavenger useful in the present invention can be used without limitation as long as it is a compound that reacts with an acid to inactivate the acid, and among them, U.S. Pat. No. 4,137,201.
- a compound having an epoxy group as described in the specification is preferred.
- Such epoxy compounds as acid scavengers are known in the art and include diglycidyl ethers of various polyglycols, particularly about 8-40 moles of ethylene oxide per mole of polyglycol.
- Metal glycol compounds such as polyglycols derived from condensation, diglycidyl ethers of glycerol (eg, those in which conventional forces are also used in and together with salty vinyl polymer compositions), Epoxidized ether condensation product, diglycidyl ether of bisphenol A (ie 4,4'-dihydroxydiphenyldimethylmethane), epoxidized unsaturated fatty acid ester (especially fatty acids of 2 to 22 carbon atoms) Alkyl esters of about 4 to 2 carbon atoms (for example, butyl epoxy stearate)), And epoxidized vegetable oils and other unsaturated natural oils, which can be represented and exemplified by compositions of various epoxidized long chain fatty acid triglycerides and the like (eg, epoxidized soybean oil, epoxidized linseed oil, etc.) As epoxies natural glycerides or unsaturated fatty acids, which generally contain 12 to 22 carbon
- n is an integer of 0 to 12.
- Other acid scavengers that can be used include those described in paragraphs 87 to 105 of JP-B-5-194788.
- the acid scavenger is preferably added in an amount of 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, and further preferably 0.5 to 2% by mass. . Use two or more of these together.
- the acid scavenger is sometimes referred to as an acid scavenger, an acid scavenger, an acid catcher, etc., but in the present invention, they can be used without any difference depending on their names.
- Ultraviolet absorbers are excellent in the ability to absorb ultraviolet light with a wavelength of 370 nm or less from the viewpoint of preventing deterioration of polarizers and display devices with respect to ultraviolet light, and from the viewpoint of liquid crystal display properties, they absorb visible light having a wavelength of 400 nm or more. A little thing, prefer something.
- Examples of the ultraviolet absorber used in the present invention include oxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, benzophenone compounds, cyanoacrylate compounds, nickel complex compounds, triazines. The power which can mention a compound based on a benzophenone compound, a benzotriazole compound and a triazine compound which are less colored are preferred. Further, ultraviolet absorbers described in JP-A Nos. 10-182621 and 8-337574, and polymer ultraviolet absorbers described in JP-A Nos. 6-148430 and 2003-113317 may be used.
- benzotriazole-based UV absorbers include 2— (2 ′ —hydroxy 1 5′-methyl phenol) benzotriazole, 2— (2 ′ —hydroxy 3 ′, 5 ′ —di- tert— Butylphenol) benzotriazole, 2- (2 '—hydroxy-3' —tert-butyl-5 '—Methylphenol) benzotriazole, 2— (2 ′ —hydroxy—3 ′, 5 ′ —di-ter t butylphenol) 5 Chronobenzobenzolazole, 2— (2 ′
- TINUVIN 171, TINUVIN 234, TINUVIN 360, TINUVIN 900, TINUVIN 928 are manufactured by Ciba Specialty Chemicals
- LA31 Alignment-Coupled Component
- benzophenone compounds include 2,4 dihydroxybenzophenone, 2, 2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy-1-methoxy-1-5-sulfobenzophenone, bis (2 methoxy 4 Hydroxy-5-benzoylmethane) and the like S, but is not limited to these.
- the ultraviolet absorber it is preferable to add 0.15% by mass of the ultraviolet absorber, and it is more preferable to add 0.23% by mass. Is preferred. Two or more of these may be used in combination.
- additives such as plasticizers, antioxidants, acid scavengers, etc., which may be part of these benzotriazole structures and benzophenone structural strength polymers or regularly polymer pendant Introduced into part of the molecular structure.
- ⁇ Plasticizer ⁇ For the production of the cellulose ester film according to the present invention, it is preferable to add at least one plasticizer to the film-forming material.
- a plasticizer is a power that is an additive that has the 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-constituting material containing the plasticizer than the cellulose resin alone at the same heating temperature. In addition, it is added to improve the hydrophilicity of the cellulose ester and to improve the moisture permeability of the cellulose ester film.
- the melting temperature of the film constituting material means a temperature in a state where the material is heated and fluidity is developed.
- the cellulose ester In order to melt and flow the cellulose ester, it is necessary to heat at least a temperature higher than the glass transition temperature. Above the glass transition temperature, the elastic modulus or viscosity decreases due to heat absorption, and fluidity is developed.
- cellulose ester may melt at the same time as it melts at the same time, resulting in a decrease in the molecular weight of cellulose ester, which may adversely affect the mechanical properties of the resulting film.Therefore, it is necessary to melt the cellulose ester at the lowest possible temperature. There is.
- the cellulose ester film according to the present invention uses, as a plasticizer, an ester compound having a structure in which an organic acid represented by the following general formula (F) and a trivalent or higher alcohol are condensed as a plasticizer.
- a plasticizer an ester compound having a structure in which an organic acid represented by the following general formula (F) and a trivalent or higher alcohol are condensed as a plasticizer.
- preferred cellulose ester film der Rukoto, wherein 1 to 25 weight 0/0 to contain. When the content is less than 1% by mass, the effect of improving the flatness is not recognized, and when the content is more than 25% by mass, bleed out is likely to occur, and the stability with time of the film is lowered. More preferred is a cellulose ester film containing 3 to 20% by mass of a plasticizer, and further preferred is a cellulose ester film containing 5 to 15% by mass.
- R to R are a hydrogen atom or a cycloalkyl group, an aralkyl group, an alkoxy group,
- a cycloalkoxy group, an aryloxy group, an aralkyloxy group, an acyl group, a carboxy group, an oxycarbonyl group, and an oxycarboxy group may be substituted, and these may further have a substituent.
- 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.
- cyclopropyl 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 vinyl group or a aryl group, a phenyl group (this phenyl group has an alkyl group or a halogen atom, etc.
- a phenoxy group (which may be further substituted with an alkyl group or a halogen atom, etc.), a acetyl group, a propionyl group, or the like.
- an unsubstituted carbonyloxy group having 2 to 8 carbon atoms such as an acyl group, an acetyloxy group, and a propio-loxy group.
- Examples of preferred substituents that may be substituted, such as a propyl group, include those groups that may be substituted with the cycloalkyl group.
- Examples of the alkoxy group represented by R to R include an alkoxy group having 1 to 8 carbon atoms,
- alkoxy groups such as methoxy, ethoxy, n-propoxy, n-butoxy, n-octyloxy, isopropoxy, isobutoxy, 2-ethylhexyloxy, or t-butoxy.
- these groups may be substituted as preferred substituents.
- a halogen atom for example, a chlorine atom, a bromine atom, a fluorine atom, a hydroxyl group, an alkoxy group, a cycloalkoxy group, an aralkyl group (this phenyl group is substituted with an alkyl group or a halogen atom).
- the group may be further substituted with an alkyl group or a halogen atom)), an acyl group such as an acetyl group or a propionyl group, and an alkyl group having 2 to 8 carbon atoms such as an acetyloxy group or a propio-loxy group. Examples thereof include an unsubstituted acyloxy group, and an arylcarboxoxy group such as a benzoyloxy group.
- the cycloalkoxy group represented by R to R is an unsubstituted cycloalkoxy group.
- C1-C8 cycloalkoxy group includes cyclopropyloxy, cyclopentyloxy, cyclohexyloxy, and the like.
- examples of a preferable substituent that may be substituted with these groups include the same groups as those described above even when they are substituted with the cycloalkyl group.
- the aryloxy group represented by R to R includes a phenoxy group.
- -Group may be substituted with an alkyl group or a cycloalkyl group such as a halogen atom.
- V may be substituted with the substituents listed as groups.
- 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.
- acyl group 8 is an unsubstituted acyl group (the hydrocarbon group of the acyl group includes an alkyl, alkenyl, and alkyl group), and these substituents may be further substituted.
- the substituent the above cycloalkyl group may be substituted, and the same examples can be given.
- Examples of the carboxoxy group represented by R to R include an acetyloxy group and a propiol.
- An unsubstituted acyloxy group having 2 to 8 carbon atoms such as an oxy group (the hydrocarbon group of the acyl group includes an alkyl group, an alkyl group, an alkyl group), and a benzoyloxy group. Forces that may be exemplified by a reelcarboxoxy group. These groups may be further substituted with the cycloalkyl group or may be substituted with the same group as the group.
- Examples of the oxycarbonyl group represented by R to R include a methoxycarbol group and an ethoxycarbonyl group.
- alkoxycarbonyl group such as a sulfonyl group or a propyloxycarbonyl group, or an arylcarbonyl group such as a phenoxycarbonyl group is represented. These substituents may be further substituted, and the above-mentioned cycloalkyl group may be substituted, and the same examples can be given.
- the oxy-carboxoxy group represented by R to R includes methoxycarbo-roluo.
- the groups can be mentioned as well.
- 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.
- V may be substituted with the groups listed above.
- a direct bond and an aromatic carboxylic acid are particularly preferable as the linking group represented by L.
- R to R are all hydrogen atoms, or at least
- R or any one of the alkoxy group, acyl group, oxycarbonyl group,
- the organic acid substituting the hydroxyl group of the trivalent or higher alcohol may be a single kind or a plurality of kinds! /.
- the trihydric or higher alcoholic compound that reacts with the organic acid represented by the general formula (F) to form a polyhydric alcohol ester compound is preferable.
- a tri- to 20-valent aliphatic polyhydric alcohol and in the present invention, a tri- or higher-valent alcohol is represented by the following general formula: The one represented by (H) is preferred.
- ⁇ represents an m-valent organic group
- m represents a positive integer of 3 or more
- the 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.
- glycerin, trimethylolethane, trimethylolpropane, and pentaerythritol are preferable.
- Esters of the organic acid represented by the general formula (F) and a trihydric or higher polyhydric alcohol can be synthesized by a known method.
- the power of a typical synthesis example shown in the examples A method of condensing an organic acid represented by the general formula (F) with a polyhydric alcohol in the presence of an acid, for example, or an organic acid in advance as an acid chloride Alternatively, there are a method of reacting with a polyhydric alcohol by leaving it as an acid anhydride, a method of reacting a phenol ester of an organic acid with a polyhydric alcohol, etc., and the yield is appropriately increased depending on the intended ester compound. It is preferred to select a method.
- plasticizer having ester power of the organic acid represented by the general formula (F) and the trihydric or higher polyhydric alcohol a compound represented by the following general formula (G) is preferable.
- R to R are a hydrogen atom or a cycloalkyl group, an aralkyl group, an alkoxy group,
- a cycloalkoxy group, an aryloxy group, an aralkyloxy group, an acyl group, a carboxy group, an oxycarbonyl group, and an oxycarboxy group are further represented, and these further have a substituent.
- R21 represents a hydrogen atom or an alkyl group.
- the molecular weight of the polyhydric alcohol ester thus obtained is not particularly limited, but is preferably 300 to 1500, more preferably 400 to 1000. 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.
- At least an organic acid represented by the general formula (F) and an ester compound produced from a trihydric or higher polyhydric alcohol card are plasticized. It is preferable to contain 1 to 25% by mass as an agent, but it may be used in combination with other plasticizers.
- the organic acid represented by the general formula (F) and the ester compound having a trihydric or higher polyhydric alcohol power 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.
- the plasticizer is preferably contained in an amount of at least 50 mass% of the entire plasticizer. More preferably 70% or more, still more preferably 80% or more. If it is used in such a range, a certain effect that the planarity of the cellulose ester film at the time of melt casting can be improved also by using in combination with another plasticizer.
- plasticizers used in combination include aliphatic carboxylic acid polyhydric alcohol plasticizers, unsubstituted aromatic force rubonic acid as described in JP-A-2003-12823, paragraphs 30 to 33, or Cycloalkylcarboxylic acid-polyhydric alcohol ester plasticizer, or dioctyl adipate, dicyclohexyl adipate, diphenyl succinate, di-2-naphthyl-1,4-cyclohexanedicarboxylate, tricyclohexyl tricarbarate, tetra 3 Methylphenol tetrahydrofuran 2, 3, 4, 5—tetracarboxylate, tetrabutyl 1,2,3,4-cyclopentanetetracarboxylate, triphenyl 1,3,5 cyclohexyl tricarboxylate, triphenylbenzene 1, 3, 5— Tetracarboxylate, phthalate plasticizer (eg Jetyl
- Polycarboxylic acid ester plasticizers triphenyl bis-phosphate, bi-phenol di-phosphate, butylene bis (jetino phosphate), ethylene bis (di-phenol phosphate), phen-bis (dibutyl) (Rephosphate), Phenol Bis (Diphenyl Phosphate) (Adeka Stub PFR, Asahi Denka), Phenol Bis (Dixylenyl Phosphate) (Adeka Stub FP500, Asahi Denka), Bisphenol A Diphenyl Phosphate (Asahi Denka) Examples thereof include phosphate plasticizers such as Adeka Stab FP600), polyether polyester plasticizers such as polymer polyesters described in paragraphs 49 to 56 of JP-A-2002-22956, and the like.
- phosphate plasticizers such as Adeka Stab FP600
- polyether polyester plasticizers such as polymer polyesters described in paragraphs 49 to 56 of JP-
- the phosphate plasticizer generates a strong acid by hydrolysis, and promotes hydrolysis of the plasticizer itself and cellulose ester. For this reason, phthalic acid ester plasticizers, polycarboxylic acid ester plasticizers, citrate ester-based plasticizers, due to problems such as deterioration in storage stability and the tendency of films to be colored when used for melt-forming cellulose esters. Preference is given to using plasticizers, polyester plasticizers and polyether plasticizers.
- the cellulose ester film according to the present invention is colored, it is used as an optical application.
- the yellowness is preferably 3.0 or less, and more preferably 1.0 or less in order to give a sound. Yellowness can be measured according to ⁇ O IS-K7103.
- a matting agent can be added to the cellulose ester film according to the present invention in order to impart slipperiness, optical and mechanical functions.
- the matting agent include fine particles of an inorganic compound or fine particles of an organic compound.
- the matting agent preferably has a spherical shape, rod shape, needle shape, layer shape, flat plate shape or the like.
- the matting agent include silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, kaolin, talc, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate, and calcium phosphate.
- examples thereof include inorganic fine particles such as metal oxides, phosphates, silicates and carbonates, and crosslinked polymer fine particles.
- silicon dioxide is preferable because it can reduce the haze of the film.
- These fine particles are preferably surface-treated with an organic substance because the haze of the film can be reduced.
- the surface treatment is preferably performed with halosilanes, alkoxysilanes, silazane, siloxane, or the like.
- halosilanes alkoxysilanes, silazane, siloxane, or the like.
- the average primary particle size of the fine particles is 0.01 to: L O / z m
- the average primary particle size of the preferred fine particles is preferably 5-50 nm, and more preferably
- These fine particles are preferably used for generating irregularities of 0.01 to L 0 m on the surface of the cellulose ester film.
- Silicon dioxide fine particles are produced by Nippon Aerosil Co., Ltd. Aerosil 200, 200V, 300, R972, R972V, R974, R202, R812
- Fine particles with different average particle sizes and materials for example, Aerosil 200V and R972V by mass ratio 0.1: 99.9 ⁇
- the matting agent is preferably added by kneading.
- a matting agent dispersed in a solvent in advance, cellulose ester, Z or a plasticizer, and Z or an ultraviolet absorber are mixed and dispersed, and then a solid is obtained by volatilizing or precipitating the solvent.
- Power to be used in the production process of cellulose ester melt The viewpoint power that the matting agent can be uniformly dispersed in the cellulose resin is also preferable.
- the matting agent is added to improve the mechanical, electrical, and optical properties of the film.
- the content is preferably 0.001 to 5% by mass. More preferably, the content is 0.001 to 1% by mass, and still more preferably 0.01 to 0.5% by mass.
- the haze value exceeds 1.0%, the haze value is preferably less than 1.0%, more preferably because the optical material is affected. Less than 5%.
- Haze value can be measured according to ⁇ O IS—K7136
- Film constituent materials are required to have little or no 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%.
- a heat loss from 30 ° C. to 250 ° C. is obtained using a differential thermogravimetric measuring device (TGZDTA200 manufactured by Seiko Denshi Kogyo Co., Ltd.), and this amount is used as the content of volatile components.
- the film constituent material used is a volatile component typified by the moisture or the solvent. It is preferable to remove before film formation or during heating. For the removal, a known drying method can be applied, and it can be carried out by a method such as a heating method, a reduced pressure method, a heated reduced pressure method, etc., or in air or in an atmosphere where nitrogen is selected as an inert gas. . When performing these known drying methods, it is preferable in terms of film quality to be performed in a temperature range in which the film constituting material does not decompose.
- the drying temperature is preferably 70 ° C or higher.
- a material having a glass transition temperature is present in the material to be dried, 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 it is below the glass transition temperature.
- the glass transition temperature with 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.
- 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. If the drying temperature is too low, the volatile component removal rate will be low, and it will take too long to dry.
- the drying process may be divided into two or more stages. For example, the drying process includes a preliminary drying process for storing materials and a immediately preceding drying process performed immediately before film formation to one week before. Also good.
- the cellulose ester film according to the present invention is preferably formed by melt casting.
- the molding method by melt casting that heats and melts without using the solvent (for example, methylene chloride, etc.) used in the solution casting method, more specifically, melt extrusion molding method, press molding method, inflation method, injection molding method And can be classified into blow molding, stretch molding and the like.
- the melt extrusion method is excellent for obtaining a polarizing plate protective film excellent in 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 a cellulose ester film according to the present invention
- FIG. 2 is an enlarged view of a cooling roll portion such as a casting die. .
- the method for producing a cellulose ester film according to the present invention is performed by mixing a film material such as cellulose resin and then using an extruder 1 from a casting die 4 to a first cooling roll. 5 is melt-extruded onto the first cooling roll 5 and then circumscribed on the first three cooling rolls 7 and 8 in order, and then cooled and solidified to form film 10. .
- 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 up by the scoring device 16.
- a touch roll 6 is provided to clamp the molten film between the first cooling roll 5 and the surface to correct the flatness!
- the touch roll 6 has an elastic surface and forms a tip with the first cooling roll 5. Details of the touch roll 6 will be described later.
- the conditions for melt extrusion can be carried out in the same manner as the conditions used for thermoplastic resins such as other polyesters.
- the material is preferably dried beforehand. It is desirable to dry the moisture to not more than lOOOOppm, preferably not more than 200ppm with a vacuum or vacuum dryer or dehumidifying hot air dryer.
- cellulose ester-based resin dried under hot air, vacuum or reduced pressure is melted at an extrusion temperature of about 200 to 300 ° C using an extruder 1, and filtered through a leaf disk type filter 2 or the like. Remove foreign matter.
- additives such as a plasticizer are not mixed in advance, they may be kneaded in the middle of the extruder.
- the cellulose resin and other additives such as a stabilizer added as necessary are mixed before melting.
- Cellulose resin and stabilizer More preferably, the mixing is performed first. Mixing may be performed with a mixer or the like, or may be mixed during 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, a ribbon mixer, or a general 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, a so-called braided semi-melt is once produced at a temperature at which only the material having a low melting point is melted, and the semi-melt is extruded 1 It is also possible to form a film by throwing it into the film. If the film component contains a material that can be thermally decomposed, it can be formed directly without producing pellets, or the above-mentioned semi-molten material can be made for the purpose of reducing the number of melting times. I prefer the method of film formation.
- 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 required, but even with a single-screw extruder, the screw shape is a Maddock type. By changing to a kneading type screw such as a unimelt type or a dull mage, an appropriate kneading can be obtained, so that it can be used. In the case of using pellets or crushed semi-melt as the film constituent material, either a single screw extruder or a twin screw extruder can be used.
- 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: LOOOOO boise, preferably 100 to 10,000 boise.
- a shorter residence time of the film constituent material in the extruder 1 is preferably within 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 can be shortened by adjusting the material supply rate, L / D, screw rotation speed, screw groove depth, etc. It is.
- the shape, rotation speed, and the like of the screw of the extruder 1 are appropriately selected depending on the viscosity, the discharge amount, and the like of the film constituting material.
- the shear rate in the extruder 1 is 1 / second to 100 ooZ seconds, preferably 5Z seconds to loooZ seconds, more preferably 10Z seconds to looZ seconds.
- the extruder 1 that can be used in the present invention 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 is used for producing a sheet or a film.
- 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, oxide chromium), etc.
- Puff as a surface cover, lapping using # 1000 or higher turret, and # 1000 or higher diamond mortar surface cutting (cutting direction perpendicular to the flow direction of the oil), Examples thereof include those subjected to processing such as electrolytic polishing and electrolytic composite polishing.
- a preferred material for the rip 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 5 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 heat bolt preferably has a length of 20 to 40 cm and a diameter of 7 to 14 mm, and a plurality of, for example, several tens of heat bolts are preferably arranged at a pitch of 20 to 40 mm.
- a gap adjustment member consisting mainly of a bolt that adjusts the slit gap by moving it back and forth in the axial direction manually may be provided.
- the slit gap adjusted by the gap adjusting member is usually 200 to 1000 ⁇ m, preferably 300 to 800 ⁇ m, more preferably 400 to 600 ⁇ m.
- 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 cooling liquid is arranged, and the cooling liquid flowing through the pipe can absorb the heat generated by the film on the roll. Of the first to third cooling rolls, the first cooling roll 5 corresponds to the rotating support of the present invention.
- the touch roll 6 in contact with the first cooling roll 5 has an elastic surface, and is deformed along the surface of the first cooling roll 5 by the pressing force applied to the first cooling roll 5, so that the first roll Form a -p between 5 and. That is, the touch roll 6 corresponds to a pinching rotary body of the present invention.
- FIG. 4 shows a schematic cross section of one embodiment of the touch roll 6 (hereinafter, touch roll A). As shown in the figure, the touch roll A is formed by arranging an elastic roller 42 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. If the metal sleeve 41 is too thin, the strength will be insufficient, and if it is too thick, the elasticity will be insufficient. As these forces, the thickness of the metal sleeve 41 is preferably 0.1 to 1.5 mm.
- the elastic roller 42 is a roll formed by providing a rubber 44 on the surface of a metal inner cylinder 43 that is rotatable through a bearing. When the touch roll A is pressed toward the first cooling roll 5, 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 form the shape of the first cooling roll 5. The first cooling low is deformed while adapting to the familiar shape. Form a -p between them. Cooling water 45 flows in a space formed between the metal sleeve 41 and the elastic roller 42.
- 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 in the same axial center inside the outer cylinder 51. It is roughly composed of A coolant 54 flows in a space 53 between the outer cylinder 51 and the inner cylinder 52.
- outer cylinder support flanges 56a and 56b are attached to the rotating shafts 55a and 55b at both ends, and a thin metal outer cylinder 51 is attached between the outer peripheral portions of the both outer cylinder support flanges 56a and 56b. It has been.
- a fluid supply pipe 59 is arranged in the same axial center in a fluid discharge hole 58 formed in the axial center portion of one rotary shaft 55a and forming a fluid return passage 57, and the fluid supply pipe 59 is
- the thin metal outer cylinder 51 is connected and fixed to the fluid shaft cylinder 60 arranged at the shaft center portion.
- Inner cylinder support flanges 61a and 61b are attached to both ends of the fluid shaft cylinder 60, respectively, and approximately 15 to 20 mm from the outer peripheral part 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 certain thickness is attached.
- a cooling liquid flow space 53 of, for example, about 10 mm is formed between the metal inner cylinder 52 and the thin metal outer cylinder 51, and the metal inner cylinder 52 has a flow space 53 and an inner space near both ends.
- An outflow port 52a and an inflow port 52b communicating with the intermediate passages 62a and 62b outside the cylinder support flanges 61a and 61b are formed respectively.
- the outer cylinder 51 is designed to be thin within a range in which the thin cylinder theory of elastodynamics can be applied in order to have flexibility, flexibility, and resilience close to rubber elasticity.
- the flexibility evaluated by this thin cylinder theory is expressed by the wall thickness tZ roll radius r. The smaller the tZr, the higher the flexibility.
- flexibility is the optimum condition when tZr ⁇ 0.03.
- the outer cylinder 51 has an equivalent spring constant equal to the thickness of the outer cylinder 51 by setting the thickness of the outer cylinder 51 to 3 mm compared to the same-shaped rubber roll.
- the roll width k in the roll rotation direction of 51 and the cooling roll is also about 9 mm, which is almost the same as the rubber roll has a width of about 12 mm. I can share what I can do. It should be noted that the amount of deflection at this -p width k is about 0.05 to 0.1 mm.
- the touch rolls A and B are urged toward the first cooling roll by urging means (not shown).
- the urging force of the urging means is F
- the value FZW (linear pressure) obtained by dividing the width W in the direction along the rotation axis of the first cooling roll 5 is 9.8 to 147 NZcm.
- FZW linear pressure
- a dip 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 dip. Therefore, since the touch roll is composed of a rigid body and the film is sandwiched over a long time with a small linear pressure, compared to the case where no gap is formed between the first cooling roll and the flatness is more reliably corrected. can do. In other words, if the line pressure is less than 9.8 NZcm, the die line cannot be eliminated sufficiently. Conversely, if the linear pressure is greater than 147 NZcm, the film will pass through the nip.
- the surfaces of Touchroll A and B can be made smoother than when the surface of Touchroll is 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 melt extruded from the casting die 4 is in contact with the first cooling roll 5 from the position P1 to the first. It is preferable to adjust the length L along the rotation direction of the first cooling roll 5 between the cooling roll 5 and the touch roll 6.
- preferred materials for the first roll 5 and the second roll 6 include carbon steel, stainless steel, and resin.
- the surface accuracy is preferably increased, and the surface roughness is set to 0.3 S or less, more preferably 0.01 S or less.
- the suction device is preferably subjected to a treatment such as heating with a heater so that the device itself does not become a place where the sublimate adheres. In the present invention, if the suction pressure is too small, the sublimate cannot be sucked effectively, so it is necessary to set the suction pressure appropriately.
- a film-like cellulose ester-based resin in a molten state from the T die 4 is mixed with the first roll (first cooling roll) 5, the second cooling roll 7, and the third cooling roll 8
- the film is cooled and solidified while being transported in close contact with the unstretched cellulose ester-based resin film. Get ten.
- the cooled and solidified unstretched film 10 peeled from the third cooling roll 8 by the peeling roll 9 has a dancer roll (film tension adjusting tool) 11. Then, the film is guided to a stretching machine 12, where the film 10 is stretched in the transverse direction (width direction). By this stretching, the molecules in the film are oriented.
- a known tenter or the like can be preferably used as a method of stretching the film in the width direction.
- the slow axis of the cellulose ester film comprising the cellulose ester-based resin film becomes the width direction.
- the transmission axis of the polarizing film is also usually in the width direction.
- a polarizing plate that is laminated so that the transmission axis of the polarizing film and the slow axis of the optical film are parallel, 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.
- the retardation value derived from the orientation state of the molecules fixed inside the film by stretching and the dimensional shape as the film are greatly changed.
- Tg is preferably 250 ° C or less.
- the stretching process may be appropriately adjusted so as to have the characteristics required for the target optical film, which may be subjected to known heat setting conditions, cooling, and relaxation treatment.
- the stretching step and the heat setting treatment are appropriately selected and performed. like this When a simple stretching process and heat setting treatment are included, the heating and pressurizing process is performed before the stretching process and heat fixing treatment.
- the refractive index can be controlled by a stretching operation.
- a stretching operation is a preferred method. Hereinafter, the stretching method will be described.
- the cellulose resin is stretched 1.0 to 2.0 times in one direction and 1.0 to 1-2 times in the direction perpendicular to the film plane,
- the required retardation Ro and Rth can be controlled.
- Ro indicates in-plane retardation
- the difference between the refractive index in the longitudinal direction MD and the refractive index in the width direction TD in the surface is multiplied by the thickness
- Rth indicates the thickness direction retardation.
- the difference between the refractive index (average of longitudinal direction MD and width direction TD) and the refractive index in the thickness direction is multiplied by the thickness.
- 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.
- the film when the film is stretched in the melt casting direction, if the shrinkage in the width direction is too large, the value of nz becomes too large. In this case, it can be improved by suppressing the width shrinkage of the film or stretching in the width direction.
- the refractive index When stretching in the width direction, the refractive index may be distributed in the width direction. This distribution may appear when the tenter method is used, and is a phenomenon that occurs when the film is stretched in the width direction, causing contraction force at the center of the film and fixing the edges. The so-called Boeing phenomenon is considered. Even in this case, by stretching in the casting direction, the bowing phenomenon can be suppressed and the distribution of phase difference in the width direction can be reduced.
- the variation in film thickness of the cellulose ester film is preferably ⁇ 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 1.01-1.5 times in the casting direction. 1.01-: L 5 times, in the width direction 1.05-2. Is more preferred to get the required retardance value.
- the transmission axis of the polarizer coincides with the width direction.
- the retardation film is preferably stretched so as to obtain a slow axis in 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.
- a target retardation value that is preferably in the direction of the slow axial force width of the retardation film
- the end of the film was slit to the product width by slitter 13 and cut off, and then the Narka mouth (embombosinda cache) was opened by the Narka device comprising embossing ring 14 and back roll 15.
- the Narka device comprising embossing ring 14 and back roll 15.
- the Narkale method can process a metal ring having an uneven pattern on its side surface by heating or caloric pressure. 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 scraping step the film is scraped while keeping the shortest distance between the outer peripheral surface of the cylindrical wound film and the outer peripheral surface of the movable transport roll immediately before this constant. It is a thing to scoop up. In addition, the surface potential of the film must be removed before the scissor roll. Means such as a static elimination blower for removing or reducing the temperature are provided.
- the winding machine for producing the polarizing plate protective film of the present invention is generally used.
- it is preferable that the initial cutting tension when the polarizing plate protective film is cut is 90.2 to 30.8 NZm.
- the film is preferably wound under environmental conditions of a temperature of 20 to 30 ° C and a humidity of 20 to 60% RH.
- a temperature of 20 to 30 ° C and a humidity of 20 to 60% RH.
- the humidity in the film winding process is less than 20% RH, it is not preferable because it is easily charged and cannot be practically used because of deterioration of film quality. If the humidity in the film winding process exceeds 60% RH, the wrinkle quality, sticking failure, and transportability deteriorate, which is not preferable.
- the winding core for winding the polarizing plate protective film into a roll may be any material as long as it is a cylindrical core, but is preferably a hollow plastic core.
- plastic material any heat-resistant plastic that can withstand the heat treatment temperature can be used, such as phenol resin, xylene resin, melamine resin, polyester resin, epoxy resin, etc. Resin.
- a thermosetting resin reinforced with a filler such as glass fiber is preferred.
- 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 around these winding cores is preferably 100 windings or more, more preferably 500 windings or more, and more preferably a winding thickness of 5 cm or more.
- the width is preferably 80 cm or more, particularly preferably lm or more.
- the thickness of the protective film is preferably 10 to 500 ⁇ m.
- the lower limit is 20 ⁇ m or more, preferably 35 ⁇ m or more.
- the upper limit is ⁇ 150 m or less, preferably ⁇ 120 m or less. Specially good! / ⁇ range ⁇ or 25 ⁇ 90 / zm.
- the retardation film is thick, the polarizing plate after polarizing plate processing becomes too thick, so that it is not suitable for the purpose of thin and light in liquid crystal displays used for notebook personal computers and mopile electronic devices.
- the retardation film is thin, it is difficult to express retardation as a retardation film, and the moisture permeability of the film is increased, so that the ability to protect the polarizer from humidity is reduced.
- 0 1 is 1 to + 1 °, preferably 1 .0. Set to 5 to + 0.5 °.
- This ⁇ 1 can be defined as the orientation angle. The measurement of ⁇ 1
- 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 retardation film is used in the multi-domain VA mode
- the retardation film is arranged in the above area with the fast axis of the retardation film as ⁇ 1, so that the display image quality is improved.
- the polarizing plate and the liquid crystal display device are in the MVA mode, the configuration shown in FIG. 7 can be taken.
- 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, it is preferable to adjust the retardation Rt distribution in the thickness direction of the film to 10% or less, more preferably 2% or less, and particularly preferably 1.5% or less.
- the retardation value distribution fluctuation is small! /
- the retardation distribution fluctuation is small! /, This is preferred from the viewpoint of preventing color unevenness.
- 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 preferably used in the MVA mode by dividing the retardation film into the above multi-domain as the VA mode. In order to achieve this, it is required to adjust the in-plane retardation Ro to a value greater than 30 nm and 95 nm or less, and a thickness direction retardation Rt greater than 70 nm and 400 nm or less.
- the above-mentioned in-plane retardation Ro has a structure in which, for example, the configuration shown in FIG. 7 is used, in which two polarizing plates are arranged in a cross-cord and a liquid crystal cell is arranged between the polarizing plates.
- the cross-col state is observed with respect to the direction observed from the normal direction, when the display surface is obliquely observed from the normal line, the polarizing plate deviates from the cross-col state, and this causes light. Compensates mainly for leaks.
- the retardation in the thickness direction mainly compensates for the birefringence of the liquid crystal cell that is observed when the liquid crystal cell is in the black display state in the TN mode and VA mode, particularly in the MVA mode, and is also observed when the oblique force is seen. Contribute to.
- the in-plane retardation Ro force is greater than 35 nm and less than or equal to 65 nm, and the thickness direction retardation Rt is greater than 90 nm and less than or equal to 180 nm, and is applied to the liquid crystal cell in the MVA mode with the configuration of FIG.
- a polarizing film disposed on the other polarizing plate for example, the retardation film disposed on 22a in FIG. Rum should have an in-plane retardation Ro of more than 30 nm and not more than 95 nm, and a thickness direction retardation Rt of more than 140 nm and not more than 400 nm.
- the display quality is improved, and this is preferable from the viewpoint of film production.
- a polarizing plate including the polarizing plate protective film (also serving as a retardation film) of the present invention can exhibit high display quality as compared with a normal polarizing plate, and more particularly a multi-domain liquid crystal display device.
- the polarizing plate of the present invention can be used for MVA (Multi-domestic Vertical Alignment) mode, PV A (Patterned Vertical Alignment) mode, CPA (Continuous Pinwheel Alignment) mode, OCB (Optical Compensated Bend) mode, etc. And is not limited to the specific liquid crystal mode and the arrangement of the polarizing plates.
- Liquid crystal display devices are being applied as devices for colorization and moving image display, and the present invention improves display quality, improves contrast, and improves the resistance of polarizing plates, resulting in fatigue. ⁇ A faithful moving image display becomes possible.
- one polarizing plate including the polarizing plate protective film of the present invention is disposed with respect to the liquid crystal cell or the liquid crystal cell. Place two on each side. At this time, it can contribute to improvement of display quality by using the polarizing plate protective film side of the present invention contained in the polarizing plate so as to face the liquid crystal cell of the liquid crystal display device.
- the films 22a and 22b face the liquid crystal cell of the liquid crystal display device.
- the polarizing plate protective film of the present invention can optically compensate the liquid crystal cell.
- the polarizing plate of the present invention is used in a liquid crystal display device, at least one 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.
- the polarizer force is opposite to the polarizing plate protective film of the present invention.
- a polarizing plate protective film of cellulose derivative is used on the side surface, and a general-purpose TAC film or the like can be used.
- the polarizing plate protective film located on the liquid crystal cell force side can be provided with other functional layers.
- a film containing a known functional layer as a display for antireflection, antiglare, scratch resistance, dust adhesion prevention and luminance improvement, or affixed to the polarizing plate surface of the present invention is not limited to these.
- the polarizing plate protective film wound up in the form of a long roll produced by the melt casting film forming method is mainly composed of cellulose ester.
- the alkali treatment process can be utilized by utilizing the above.
- the resin constituting the polarizer is polyvinyl alcohol, it can be bonded to the polarizing plate protective film using a completely saponified polyvinyl alcohol aqueous solution in the same manner as the conventional polarizing plate protective film. Therefore, the present invention is excellent in that a conventional polarizing plate processing method can be applied, and particularly excellent in that a long roll polarizing plate can be obtained.
- a polarizing plate protective film obtained by forming a long cellulose ester film and winding it into a roll shape refers to a cellulose ester film formed by a melt casting method with a wound core (cylindrical shape).
- the production effect obtained by the present invention becomes more prominent especially in a long scroll of 100 m or more, and the longer the length is 1500 m, 2500 m, or 5000 m, the more the production effect of polarizing plate production is obtained.
- the roll length is 10 to 5000 m, preferably 50 to 4500 m, considering productivity and transportability.
- the width of the film at this time is the width of the polarizer.
- a width suitable for the production line can be selected.
- a film is produced with a width of 0.5 to 4.0 m, preferably 0.6 to 3.0 m, wound into a roll, and subjected to polarizing plate processing.
- After manufacturing a film of the desired double width or more and winding it on a roll it is cut to obtain a roll of the desired width, and such a roll is used for polarizing plate force. Moyo! ,.
- a polarizing plate protective film In the production of a polarizing plate protective film, functional layers such as an antistatic layer, a hard coat layer, a slippery layer, an adhesive layer, an antiglare layer, and a single layer of noble layer are coated before and after stretching. May be. At this time, various surface treatments such as corona discharge treatment, plasma treatment, and chemical treatment can be performed as necessary.
- the clip holding portions at both ends of the cut film are pulverized or granulated as necessary, and then used as film raw materials of the same type or You may reuse as a raw material for films of different varieties.
- a cellulose ester film having a laminated structure can also be produced by co-extrusion of a composition containing cellulose esters having different additive concentrations such as the plasticizer, ultraviolet absorber, and matting agent.
- a cellulose ester film having a structure of skin layer / core layer Z skin layer can be produced.
- the matting agent can be included in the skin layer more or only in the skin layer.
- More plasticizer and UV absorber can be contained in the core layer than in the skin layer, and may be contained only in the core layer. It is also possible to change the types of plasticizers and ultraviolet absorbers in the core layer and skin layer.
- the skin layer contains a low-volatile plasticizer and Z or ultraviolet absorber, and the core layer is made plastic.
- the glass transition temperature of the core layer is preferably lower than the glass transition temperature of the skin layer, which may be different between the skin layer and the core layer. At this time, the glass transition temperatures of both the skin and the core are measured, and the average value calculated from these volume fractions is defined as the glass transition temperature Tg, and can be handled in the same manner. Also, the viscosity of the melt containing the cellulose ester at the time of melt casting may be different between the skin layer and the core layer. The viscosity of the skin layer may be greater than the viscosity of the core layer, or the viscosity of the core layer ⁇ the viscosity of the skin layer. .
- the cellulose ester film according to the present invention has a dimensional stability of 80 ° C and 90% RH when measured based on the size of the film left for 24 hours at 23 ° C and 55% RH.
- the variation value is less than ⁇ 2.0%, preferably less than 1.0%, and more preferably less than 0.5%.
- the cellulose ester film according to the present invention is used as a retardation film for a polarizing plate protective film, if the retardation film itself has a fluctuation within the above range, the absolute value and orientation of the retardation as a polarizing plate Since the corners deviate from the initial settings, the ability to improve display quality may be reduced, or display quality may deteriorate.
- the method for producing the polarizing plate is not particularly limited, and can be produced by a general method.
- the obtained cellulose ester film was treated with an alkali, and a polybulal alcohol film was immersed and drawn in an iodine solution.
- the polarizing plate may be processed by applying an easy adhesion process as described in JP-A-6-94915 and JP-A-6-118232.
- the polarizing plate is composed of a polarizer and protective films 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. It can.
- the protective film and separate film are used for the purpose of protecting the polarizing plate at the time of shipping the polarizing plate and at the time of product inspection.
- 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 surface side to bond the polarizing plate 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 polarization plane in a certain direction.
- a typical polarizer currently known is a polyvinyl alcohol polarizing film.
- As the polarizer a polyvinyl alcohol aqueous solution is formed and dyed by stretching it uniaxially, or after being dyed and then uniaxially stretched, preferably subjected to a durability treatment with a boron compound.
- One side of the polarizing plate protective film of the present invention is bonded to the surface of the polarizer to form a polarizing plate. It is preferably bonded together with a water-based adhesive mainly composed of complete acid polyvinyl alcohol or the like.
- a polarizer having a thickness of 10 to 30 m is preferably used.
- a mixture of 30 g of acetic acid and 10 g of water was added dropwise over 20 minutes to hydrolyze excess anhydride. While maintaining the temperature of the reaction solution at 40 ° C., 90 g of acetic acid and 30 g of water were added and stirred for 1 hour. The mixture was opened in an aqueous solution containing 2 g of magnesium acetate, stirred for a while, filtered and dried to obtain cellulose ester C-2.
- the obtained cellulose ester had a acetyl substitution degree of 1.45, a propionyl substitution degree of 1.27, and a weight average molecular weight of 211,000.
- the total number of carbon atoms is 6.71.
- Fatty anhydride I Acetic anhydride II: Propionic anhydride or n-butyric acid
- Ethyl was distilled off under reduced pressure, and purification was performed to obtain the target compound.
- the molecular weight of this compound was 675.
- the ethyl acetate was distilled off under reduced pressure and purified to obtain 193 parts by mass (yield 90%) of a white solid.
- the molecular weight of this compound was 433.
- the target compound was obtained by distillation under reduced pressure and purification.
- the molecular weight of this compound is 494.
- a reactor equipped with a cooling condenser was charged with 648 parts by weight of ethylene glycol, 58 parts by weight of diethylene glycol, 1121 parts by weight of succinic acid, 83 parts by weight of terephthalic acid, 0.03 parts by weight of tetrabutyl titanate, and 140 °
- the dehydration condensation reaction was carried out at 220 ° C for 2 hours at 220 ° C for 2 hours and at 220 ° C for another 20 hours to obtain an aliphatic-aromatic copolyester compound A1 having a number average molecular weight of 1500. .
- the carbon number average of the diol used for this was 2.1, and the carbon number average of the dicarboxylic acid was 4. [0303] (Synthesis Example 14; plasticizer, aliphatic polyester compound A2)
- a reactor equipped with a cooling condenser was charged with 699 parts by weight of ethylene glycol, 1180 parts by weight of cono and succinic acid, 0.03 parts by weight of tetrabutyl titanate, 2 hours at 140 ° C, 2 hours at 220 ° C, The cooling condenser was removed, and a dehydration condensation reaction was further performed at 220 ° C. for 20 hours to obtain an aliphatic polyester compound A2 having a number average molecular weight of 2000.
- the diol used for this had an average carbon number of 2
- the dicarboxylic acid had an average carbon number of 4.
- a cellulose ester film 11 was prepared by melt casting using various compounds prepared in the above synthesis examples and various commercially available compounds as additives.
- Additive 1 Exemplary compound 1 1 1 part by mass
- Additive 2 GTB (Glyceryl Tribenzoate, Aldrich) 10 parts by mass
- Additive 3 IRGANOX-1010 (Ciba Specialty Chemicals)
- Tinuvin928 (Ciba Specialty Chemicals) 1. 8 parts by mass
- the above mixture was melt-mixed at 230 ° C using a twin-screw extruder and pelletized.
- the glass transition temperature Tg of this pellet was 136 ° C.
- the heat bolt was adjusted so that the gap width of the casting die 4 was 0.5 mm within 30 mm from the end in the width direction of the film, and lmm at other locations.
- touch roll touch roll A was used, and 80 ° C water was poured into it as cooling water.
- the first cold from the position P1 where the resin extruded from the casting die 4 contacts the first cooling roll 5 The length L along the peripheral surface of the first cooling roller 5 up to the position P2 at the upstream end of the first cooling roller 5 in the rotation direction of the rejection roller 5 and the touch roller 6 was set to 20 mm. Thereafter, the touch roll 6 was separated from the first cooling roll 5 and the temperature T of the melted part immediately before being pressed between the first cooling roll 5 and the touch roll 6 was measured.
- the temperature T of the melted part immediately before being sandwiched between the first cooling roll 5 and the touch roll 6 is: -up upstream end P2 Furthermore, the temperature was measured with a thermometer (HA-200E manufactured by Anritsu Keiki Co., Ltd.) at a position on the upstream side of 1 mm. As a result of the measurement in this example, the temperature T was 141 ° C. The linear pressure of the touch roll 6 against the first cooling roll 5 was 14.7 N Zcm.
- the film was subjected to a 10 mm width and height narrowing process on both ends of the film, and wound on a core with a winding tension of 220 NZm and a taper of 40%.
- the size of the core was 152 mm inside diameter, 165-180 mm outside diameter, and 1550 mm long.
- this core material a pre-prepared resin in which glass fiber and carbon fiber were impregnated with epoxy resin was used.
- the core surface was coated with epoxy conductive resin and the surface was polished to a surface roughness Ra of 0.3 ⁇ m.
- the extrusion amount and take-up speed were adjusted so that the film had a thickness of 80 ⁇ m, and the length of the film was 2500 m.
- This cellulose ester film original fabric sample is designated as No. 1-1.
- the wound cellulose ester film original sample was wrapped twice with a polyethylene sheet and stored for 30 days under conditions of 25 ° C. and 50% RH by the storage method shown in FIG. After that, take out the box strength, open the polyethylene sheet, reflect the reflected fluorescent tube on the film surface, observe the distortion or fine disturbance, and rank the horse's back failure into the following levels: did.
- the core transfer that clearly shows a dot-like deformation of 50 ⁇ m or more, or a band-like deformation in the width direction. Measured and ranked into the following levels.
- the original film was wound around the core, and when the sheet was damaged at the beginning, the original film was removed from the core and wound again. The number of defects at this time was counted. This operation was repeated 10 times, the average value was obtained, and the ranking was performed to the following levels.
- Table 3 shows the evaluation results.
- the cellulose ester film raw material sample 2-1 of the present invention was prepared in the same manner as in the cellulose ester film original material sample 1-1 of Example 1 except that the additives and addition amounts described in Table 4 below were changed. 2-12 and comparative cellulose ester film original sample 2-13 were prepared. [Table 4]
- the cellulose ester film original fabric samples 2-1 to 2-12 containing the compounds of the general formulas (1) to (3) according to the present invention in combination with plasticizers and antioxidants are long. It can be seen that even if stored for a period of time, it is a cellulose ester film that is less prone to deformation failures of the original film, such as horseback failure, core transfer, and wrinkles.
- the cellulose ester film original fabric sample 16 of Example 1 In the production of the cellulose ester film original fabric sample 16 of Example 1, the cellulose ester film original fabric sample 3-1 to 3— of the present invention was similarly performed except that the cellulose ester C 1 was changed to C 2 to C 7. 6 was produced.
- Polymethylmethacrylate (weight average molecular weight 550,000, Tg: 90 ° C) 0.5 parts
- Conductive polymer resin P— 1 (0.1-0.3 ⁇ m particles) 0.5 parts
- a polarizing plate protective film having a function was prepared according to the following.
- the cellulose ester film original sample 1-1 prepared in Example 1 was wrapped twice in polyethylene sheet and stored for 30 days under conditions of 25 ° C and 50% RH using the storage method shown in Fig. 8. Thereafter, it was stored under conditions of 40 ° C. and 80% RH. Thereafter, the polyethylene sheet was removed, and the cellulose ester film unwound from each original fabric sample was gravure-coated with a curl-preventing layer coating composition (3) to a wet film thickness of 13 m and dried. Drying was performed at a temperature of 80 ⁇ 5 ° C. This is Sample 1-1A.
- the antistatic layer coating composition (1) was applied to the other side of the cellulose ester film 28. C, apply at a film transport speed of 30mZ min with a coating width of lm so that the wet film thickness is m in an environment of 82% RH, and then dry in a drying section set at 80 ° C at 5 ° C.
- a resin layer having a dry film thickness of about 0.2 m was provided to obtain a cellulose ester film with an antistatic layer. This is designated as Sample 1 1B.
- a hard coat layer coating composition (2) is formed on the antistatic layer by a wet film thickness.
- Sample 1-29A coated with anti-curl layer coating composition (3), and further antistatic layer sample coated with coating composition (1) on Sample 1-29B, and further on this antistatic layer A sample coated with the hard coat layer coating composition (2) was designated as Sample 1-29C.
- a 120 m-thick polybulal alcohol film was immersed in an aqueous solution containing 1 part by mass of iodine, 2 parts by mass of potassium iodide, and 4 parts by mass of boric acid, and stretched 4 times at 50 ° C. to produce a polarizer.
- Raw material samples of cellulose ester film of the present invention produced in Examples 1 to 3, 1 6, 1, 11, 1-17, 1-20, 1-21, 1-22, 2-1, 2-3, 2-4, 2-8, 2-12, 3-1 to 3 6 and comparative cellulose ester film original sample 1 29 are wrapped in polyethylene sheet twice and stored at 25 ° C by the storage method shown in Fig. 8. The sample was stored at 50% RH for 30 days, and then stored at 40 ° C and 80% RH. Thereafter, the polyethylene sheet is removed, and the cellulose ester film unwound from each original fabric sample is alkali-treated with 40 mol C of 2.5 mol ZL sodium hydroxide / sodium hydroxide aqueous solution for 60 seconds, followed by washing with water and drying. Alkaline treatment.
- the samples of the present invention 1 6, 1 11, 1 17, 1 20, 1 21, 1 22, 2-1, 2-3, 2-4, 2-8, 2- 12, 3-1 to 3-6 and comparative samples 1-29
- the polarizing plate of the present invention in which a protective film is formed by laminating a double-sided force with a 5% by weight aqueous solution of a fully-polyvinyl alcohol as an adhesive on the alkali-treated surface 1-6, 1-11, 1-17, 1 — 20, 1—21, 1—22, 2—1, 2—3, 2—4, 2—8, 2—12, 3—1 to 3—6 and comparative polarizing plate 1—29 were produced. did.
- the polarizing plate of 15-type TFT color liquid crystal display LA-1529HM (manufactured by NEC) was peeled off, and each polarizing plate produced above was cut according to the size of the liquid crystal cell. Adhering the two polarizing plates produced so as to sandwich the liquid crystal cell so that the polarizing axes of the polarizing plates are perpendicular to each other so that they are perpendicular to each other, a 15-inch TFT color liquid crystal display is produced, and a cellulose ester film When the characteristics of the polarizing plate were evaluated, the polarizing plate of the present invention 1
Description
Claims
Priority Applications (3)
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JP2008517849A JPWO2007138910A1 (ja) | 2006-05-31 | 2007-05-21 | 偏光板保護フィルム及びその製造方法、偏光板及びその製造方法、液晶表示装置 |
US12/302,114 US20090185112A1 (en) | 2006-05-31 | 2007-05-21 | Polarizing plate protective film and method for manufacturing the same, polarizing plate and method for manufacturing the same, and liquid crystal display device |
CN2007800191878A CN101454696B (zh) | 2006-05-31 | 2007-05-21 | 偏振片保护膜及其制造方法、偏振片及其制造方法、液晶显示装置 |
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US (1) | US20090185112A1 (ja) |
JP (1) | JPWO2007138910A1 (ja) |
KR (1) | KR20090019808A (ja) |
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JP2010116486A (ja) * | 2008-11-13 | 2010-05-27 | Fujifilm Corp | セルロースアシレートフィルム、偏光板および液晶表示装置 |
JP2010271619A (ja) * | 2009-05-25 | 2010-12-02 | Konica Minolta Opto Inc | ロール状偏光板保護フィルム、偏光板およびロール状偏光板保護フィルムの製造方法 |
CN102759758A (zh) * | 2011-04-21 | 2012-10-31 | 富士胶片株式会社 | 光学膜、偏振片和液晶显示装置 |
JP2012234159A (ja) * | 2011-04-21 | 2012-11-29 | Fujifilm Corp | 光学フィルム、偏光板及び液晶表示装置 |
WO2014203796A1 (ja) * | 2013-06-17 | 2014-12-24 | Dic株式会社 | セルロースエステル樹脂組成物、セルロースエステル光学フィルム、偏光板及び液晶表示装置 |
JP2020537194A (ja) * | 2017-10-09 | 2020-12-17 | スリーエム イノベイティブ プロパティズ カンパニー | 光学構成要素及び光学システム |
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KR100556503B1 (ko) * | 2002-11-26 | 2006-03-03 | 엘지전자 주식회사 | 건조기의 건조 시간제어 방법 |
US9273195B2 (en) | 2010-06-29 | 2016-03-01 | Eastman Chemical Company | Tires comprising cellulose ester/elastomer compositions |
US9200147B2 (en) | 2010-06-29 | 2015-12-01 | Eastman Chemical Company | Processes for making cellulose ester compositions |
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US10077342B2 (en) | 2016-01-21 | 2018-09-18 | Eastman Chemical Company | Elastomeric compositions comprising cellulose ester additives |
KR101992007B1 (ko) | 2016-12-27 | 2019-06-21 | 삼성에스디아이 주식회사 | 편광판용 폴리에스테르 보호필름, 이를 포함하는 편광판, 및 이를 포함하는 액정표시장치 |
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JP2010116486A (ja) * | 2008-11-13 | 2010-05-27 | Fujifilm Corp | セルロースアシレートフィルム、偏光板および液晶表示装置 |
JP2010271619A (ja) * | 2009-05-25 | 2010-12-02 | Konica Minolta Opto Inc | ロール状偏光板保護フィルム、偏光板およびロール状偏光板保護フィルムの製造方法 |
CN102759758A (zh) * | 2011-04-21 | 2012-10-31 | 富士胶片株式会社 | 光学膜、偏振片和液晶显示装置 |
JP2012234159A (ja) * | 2011-04-21 | 2012-11-29 | Fujifilm Corp | 光学フィルム、偏光板及び液晶表示装置 |
WO2014203796A1 (ja) * | 2013-06-17 | 2014-12-24 | Dic株式会社 | セルロースエステル樹脂組成物、セルロースエステル光学フィルム、偏光板及び液晶表示装置 |
JPWO2014203796A1 (ja) * | 2013-06-17 | 2017-02-23 | Dic株式会社 | セルロースエステル樹脂組成物、セルロースエステル光学フィルム、偏光板及び液晶表示装置 |
JP2020537194A (ja) * | 2017-10-09 | 2020-12-17 | スリーエム イノベイティブ プロパティズ カンパニー | 光学構成要素及び光学システム |
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US20090185112A1 (en) | 2009-07-23 |
CN101454696A (zh) | 2009-06-10 |
KR20090019808A (ko) | 2009-02-25 |
JPWO2007138910A1 (ja) | 2009-10-01 |
CN101454696B (zh) | 2011-07-27 |
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