WO2006126592A1 - セルロースアシレートフィルム、並びに、これを用いた偏光板、光学補償フィルムおよび液晶表示装置 - Google Patents
セルロースアシレートフィルム、並びに、これを用いた偏光板、光学補償フィルムおよび液晶表示装置 Download PDFInfo
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- WO2006126592A1 WO2006126592A1 PCT/JP2006/310364 JP2006310364W WO2006126592A1 WO 2006126592 A1 WO2006126592 A1 WO 2006126592A1 JP 2006310364 W JP2006310364 W JP 2006310364W WO 2006126592 A1 WO2006126592 A1 WO 2006126592A1
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- Prior art keywords
- film
- cellulose acylate
- liquid crystal
- layer
- preferable
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- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical compound C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- 235000021286 stilbenes Nutrition 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid Chemical compound NS(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000001016 thiazine dye Substances 0.000 description 1
- 125000000101 thioether group Chemical class 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- UAXOELSVPTZZQG-UHFFFAOYSA-N tiglic acid Natural products CC(C)=C(C)C(O)=O UAXOELSVPTZZQG-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 150000001608 tolans Chemical class 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229960002622 triacetin Drugs 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 229940070710 valerate Drugs 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
- B29C41/26—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on a rotating drum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
- B29C48/9155—Pressure 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
- 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
- B29C55/045—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique in a direction which is not parallel or transverse to the direction of feed, e.g. oblique
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3016—Polarising elements involving passive liquid crystal elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- 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
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
- B29K2995/0034—Polarising
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/08—Cellulose derivatives
- C08J2301/10—Esters of organic acids
Definitions
- the present invention relates to a cellulose acylate film formed by melt casting and suitable for optical film use, and a polarizing plate, an optical compensation film, an antireflection film, and a liquid crystal display device using the same.
- a cellulose acylate film used in a liquid crystal image display device is produced, it is dissolved in a chlorinated organic solvent such as dichloromethane, which is cast on a substrate and dried to form a film.
- a chlorinated organic solvent such as dichloromethane
- the solution casting method is mainly implemented.
- dichloromethane (boiling point: about 40 ° C) 1S has been used as a good solvent for cellulose acylate.
- Dichloromethane is preferably used because it has the advantage of being easy to dry because it has a low boiling point in the film formation and drying steps of the production process.
- chlorinated organic solvents which have a low boiling point from the viewpoint of environmental conservation, have been significantly reduced in the handling process even in sealed facilities. For example, a thorough closed system was used to prevent leaks from the system, and in the unlikely event that a leak occurred, a gas absorption tower was installed before it was released to the outside air, and an organic solvent was adsorbed and treated. Furthermore, almost no organic solvent was discharged due to combustion by thermal power or decomposition of chlorinated organic solvent by electron beam before discharging, but further research is necessary until complete non-discharge. .
- Patent Document 1 Japanese Patent Laid-Open No. 2000-352620
- An object of the present invention is to provide a cellulose acylate film in which generation of cutting waste during cutting is suppressed, and a polarizing plate, a compensation film, an antireflection film, and a liquid crystal display device using the cellulose acylate film.
- the object of the present invention is achieved by the following configurations.
- a cellulose acylate film characterized in that the melt viscosity has a shear rate dependence of 0.1 to 2.
- X represents the degree of substitution of the acetyl group
- ⁇ represents the total degree of substitution of the propiol group, butyryl group, pentanoyl group and hexanol group.
- a polarizing plate comprising at least one layer of the cellulose acylate film according to any one of (1) to (5) laminated on a polarizing film.
- a liquid crystal display device comprising at least one of the polarizing plate according to (6), the optical compensation film according to (7), and the antireflection film according to (8). .
- a cellulose acylate film in which generation of cutting waste during cutting is suppressed, and a polarizing plate, an optical compensation film, an antireflection film, and a liquid crystal display device using the cellulose acylate film. be able to.
- FIG. 1 is a schematic diagram showing a configuration of a melt film-forming apparatus provided with a touch roll and a casting roll.
- 1 is an extruder
- 2 is a die
- 3 is a melt (melt)
- 4 is a touch tool
- 11 to 13 are casting rolls.
- the resin melted by the melt extruder is extruded from the die die and then cooled and solidified on the casting drum to form a film, but the following heterogeneous structure is formed in the die. Is done.
- the extruded resin is extruded through a horizontally long rectangular slit in the die.
- the surface in contact with the die slit near both surfaces of the extruded film
- the shear rate is fast at the center (the center in the thickness direction of the film).
- Cellulose acylate forms hydrogen bonds between the remaining hydroxyl groups, which increases the melt viscosity. For this reason, the shear rate is high and the hydrogen bond is broken and the melt viscosity is lowered (breaking the structural viscosity).
- the temperature of the melted resin passing through the die is high at the central part (the central part in the film thickness direction) where the temperature is low on the surface in contact with the slit (near both surfaces of the extruded film). This is due to the fact that the die temperature tends to decrease due to contact with the outside air, while the inside has little heat dissipation to the outside and the temperature is difficult to decrease. Melt viscosity is temperature dependent and generally higher at lower temperatures. However, if this tendency is too strong, the melt viscosity near the surface tends to increase, the fluidity decreases, and the orientation of cellulose sylate tends to decrease.
- the melt viscosity is likely to decrease due to the high temperature in the central part, and the cellulose acylate tends to flow easily and orient in the flow direction.
- the surface is soft and the inside is hard, and cutting scraps are easily generated.
- the cellulose acylate film of the first aspect of the present invention is characterized in that the shear rate dependence of the melt viscosity is 0.1 to 2.
- the cellulose acylate film of the second invention is characterized in that the temperature dependence of the melt viscosity is 0.1 to 3.
- the cellulose acylate film of the present invention is characterized in that at least one of the following conditions (1) and (2) is satisfied.
- condition in the present invention it may be referred to as “conditions in the present invention”. However, it is particularly preferable to satisfy both conditions.
- the cellulose acylate film of the present invention is characterized by reducing the shear rate dependency and temperature dependency of the melt viscosity of cellulose acylate.
- the shear rate dependency of the melt viscosity is 0.1 to 2, 0.3 to 1.7 is preferable, and more preferably 0.5 to 1.5.
- the melt temperature dependence of the melting temperature is less than 0.1, the melt (melted resin) is difficult to level at the exit of the T die, and surface deterioration due to uneven flow tends to occur. This is because the melt viscosity does not increase even when the shear rate is lowered when extruded by T-Dieka, so that the melt flows easily, which causes uneven flow. If it exceeds 2, as described above, a flow (orientation) difference due to a viscosity difference occurs on the surface inside the melt at the exit of the T die, and cutting scraps are likely to be generated during cutting.
- the “melt viscosity dependence on the cutting speed” here refers to the melt viscosity ( ⁇ 1) at a shear rate of 1 (Z seconds) measured at 220 ° C and the shear rate of 100 (220 seconds).
- the melt viscosity at a shear rate of 1 (Z seconds) is preferably lOOPa's-: L000 OPa-s force, more preferably 200 Pa-s-5000 Pa-s, and even more preferably 300 Pa's-3000 Pa's. is there.
- the melt viscosity at a shear rate of 100 (Z seconds) is 1 Pa's to 7900 Pa's, more preferably 2 Pa's to 3900 Pa's, and even more preferably 3 Pa's to 2800 Pa's.
- the degree of polymerization of the cellulose acylate is preferably from 100 to 400, more preferably from 120 to 300, and even more preferably from 150 to 250.
- the degree of polymerization of the cellulose acylate is determined by Uda et al.'S intrinsic viscosity method (Kazuo Uda, Hideo Saito, Journal of Textile Science, 18th No. 1, 105-120, 1962), gel permeation chromatography ( It can be measured by a method such as molecular weight distribution measurement by GPC). Further, a method for measuring the degree of polymerization of the cellulose acylate is described in detail in JP-A-9-95538.
- the temperature dependence of the melt viscosity is 0.1 to 3, which is favorable. It is preferably 0.3 to 2.5, and more preferably 0.5 to 2.
- the temperature dependence of the melting temperature is less than 0.1, the melt (melted resin) is difficult to level at the T-die outlet, and surface deterioration due to uneven flow tends to occur. This is because the melt viscosity does not increase even when the shear rate is lowered when extruded by T-Dieka, so that the melt easily flows, which causes uneven flow. If it exceeds 3, as described above, the flow (orientation) difference due to the viscosity difference occurs on the surface inside the melt at the exit of the T die, and cutting waste is likely to be generated during cutting.
- the “temperature dependence of melt viscosity” here is the logarithm (log 190Z 240)) of the ratio of melt viscosity measured at 190 ° C (7 to 190) and melt viscosity 240) measured at 240 ° C. It is expressed.
- the melt viscosity 240) at 240 ° C. is preferably from 1 Pa ′s to LOOPa ′ s, more preferably from 3 Pa • s to 80 Pa ′s, and even more preferably from 5 Pa ′s to 50 Pa ′s. .
- the melt viscosity at 190 ° C "190) is 1.3 Pa 's ⁇ : LOOOOOPa' s, more preferably 3.8 Pa-s ⁇ 80000 Pa 's, more preferably 6.3 Pa' s ⁇ 50000Pa's.
- the degree of acyl substitution at the 6-position of cellulose should be 0.9 or more, or (B) the acyl group must have a certain requirement.
- the residual sulfuric acid content in the cellulose acylate is 0 ppm to 100 ppm, or (D) At least one of acetic acid, propionic acid, butyric acid, and valeric acid in the cellulose acylate. It is preferable to add 1 ppm to 500 ppm of (E) or (E) cellulose acylate to contain 1 ppm to 200 ppm of an alkali metal ion.
- melt viscosity changes with shear rate and temperature is due to hydrogen bonds between the hydroxyl groups of cellulose acylate. That is, when the hydrogen bond is broken by temperature or shear, the viscosity is lowered and the melt viscosity is lowered. As a result, the dependence on the shear rate and temperature is increased. For this reason, it is preferable not to form a hydrogen bond between the hydroxyl groups, but it is not preferable that all the hydroxyl groups in cellulose acylate are acylated because the hydrophobicity becomes too high. Therefore, it is necessary to efficiently reduce hydrogen bonds while maintaining a desired acylation rate.
- cellulose acylate the ability of hydroxyl groups to exist at three positions of 2, 3, and 6 In order to satisfy the conditions in the present invention, it is effective to lower the hydroxyl group at position 6 of these. is there . This is because the 2nd and 3rd positions are bonded directly to the dalcobilanose ring and have low mobility, whereas the 6th position is bonded from the dalcobilanose ring via a methylene group, and thus has a high mobility hydrogen bond. It is because it is easy to form.
- the degree of acylation at the 6-position of the preferred cellulose acylate is preferably 0.9 to 1 force S, more preferably 0.91 to 0.99, and still more preferably 0.92 to 0.98.
- Such cellulose acylate can be synthesized as follows.
- cellulose raw material used in the present invention those derived from hardwood pulp, softwood pulp, and cotton linter are preferably used.
- a cellulose raw material it is preferable to use a high-purity material having a cellulose content of 92 mass% to 99.9 mass%.
- the cellulose raw material is in the form of a film or a lump, it is preferable to pulverize the cellulose raw material. It is preferable that the cellulosic form progresses until the fine powder power becomes feathery.
- a treatment in which the cellulose raw material is brought into contact with the activator prior to the acylation reaction.
- the activator water or carboxylic acid can be used.
- Preferred carboxylic acids as the activator are carboxylic acids having 2 to 7 carbon atoms (for example, acetic acid, propionic acid, butyric acid, 2-methylpropionic acid, valeric acid, 3 methylbutyric acid, 2 methylbutyric acid, 2,2 dimethylpropion).
- Acid hexanoic acid, 2-methylvaleric acid, 3-methylvaleric acid, 4-methylvaleric acid, 2,2 dimethylbutyric acid, 2,3 dimethylbutyric acid, 3,3 dimethylbutyric acid, cyclopentanecarboxylic acid , Heptanoic acid, cyclohexanecarboxylic acid, benzoic acid, etc.), more preferably acetic acid, propionic acid, or butyric acid, and particularly preferably acetic acid. Two or more of these may be used in combination or added as an acid anhydride.
- the method of adding the activator can be appropriately selected from the method powers such as spraying, dripping and dipping.
- a catalyst such as sulfuric acid can be further added, and the preferred addition amount is 0.1% by mass to 10% by mass with respect to the cellulose.
- the addition amount of the activator is preferably 5% by mass or more with respect to cellulose. More preferably, it is particularly preferably 30% by mass or more.
- the activation time is preferably 20 minutes or more, and the upper limit of the activation time is preferably 72 hours or less, more preferably 24 hours or less, and particularly preferably 12 hours or less. .
- the temperature of the active liquid is preferably 0 ° C to 90 ° C, more preferably 15 ° C to 80 ° C, and particularly preferably 20 ° C to 60 ° C.
- a typical acylation method is a liquid phase acetylation method using acetic anhydride, acetic acid and sulfuric acid catalyst.
- cellulose raw materials such as wood pulp are pretreated with an appropriate amount of organic acid, and then put into a pre-cooled acylated mixed solution for esterification to complete cellulose acylate (2nd, 3rd and 6th positions). Synthesize the total force of the degree of substitution of ⁇ .
- the acylated mixed solution generally contains an organic acid as a solvent, an anhydrous organic acid as an esterifying agent, and sulfuric acid as a catalyst.
- the organic acid anhydride is usually used in a stoichiometric excess over the total of the cellulose that reacts with it and the water present in the system.
- a neutralizing agent for example, calcium, magnesium, iron, etc.
- the obtained complete cellulose acylate is subjected to oxidative aging by maintaining it at 50 to 90 ° C in the presence of a small amount of acetic acid reaction catalyst (generally, remaining sulfuric acid) to obtain the desired To a cellulose acylate having a degree of acyl substitution and a degree of polymerization.
- a small amount of acetic acid reaction catalyst generally, remaining sulfuric acid
- the desired cellulose acylate it remains in the system and can completely neutralize the catalyst using the neutralizing agent as described above, or water or dilute sulfuric acid without neutralization.
- the cellulose acylate solution is introduced into the solution (or water or dilute sulfuric acid is added into the cellulose acylate solution) to separate the cellulose acylate, and the cellulose acylate is obtained by washing and stabilizing treatment.
- the force of the 2nd or 3rd position of the acyl substitution is higher than the 6th position of the acyl substitution.
- the cellulose acylate according to the present invention is the 2nd and 3rd positions.
- the 6-position acyl substitution is high.
- Specific conditions for the synthesis of cellulose acylate include the synthesis of cellulose acylate having a high degree of substitution at the 6-position. For this, the methods described in JP-A-11-5851, JP-A-2002-212338 and JP-A-2002-338601 can be used.
- the cellulose acylate in the present invention can be prepared by the following method. First, when cellulose acylate is aged in the presence of water or an alcohol and a catalyst of 0.1 to 10 mol% (0.1 mol% or more and less than 10 mol%) of the acyl donor, the acyl donor. It is possible to easily and appropriately adjust the degree of acyl substitution at the 2nd, 3rd and 6th positions. That is, when the amount of water or alcohol present is 10 mol% or more of the acyl donor, cellulose acylate having a high degree of substitution (the total degree of substitution of all acyls is 2.0 or more) is eliminated. It's easy to do.
- the reaction between the acyl donor and the cellulose acylate can be made reversible by adjusting the abundance of water or alcohol to less than 10 mol% of the acyl donor.
- the degree of acetyl substitution at the 2-position, 3-position and 6-position can be adjusted. It can be adjusted effectively.
- X represents the degree of substitution of the acetyl group
- ⁇ represents the total degree of substitution of the propiol group, butyryl group, pentanoyl group and hexanol group.
- the cellulose acylate in the present invention preferably satisfies all of the following formulas (4) to (9), more preferably all of the following formulas (4) to (6).
- a propyl group, a butyryl group, a pentanoyl group and a hexanol group selected in the cellulose acylate is preferable.
- This has the effect of suppressing the formation of hydrogen bonds between cellulose acylates, which are bulkier than these acetyl groups.
- the formation of structural viscosity can be suppressed, and the temperature and shear rate dependence of melt viscosity can be reduced.
- propiol group and pentyl group are more preferable.
- cellulose acylates may be used alone or in combination of two or more. Further, a polymer component other than cellulose acylate may be appropriately mixed.
- cellulose acylate residual sulfuric acid is present as a synthesis catalyst. Such residual sulfuric acid decomposes the ester bond when the cellulose acylate is melted.
- the 6-position acyl group is highly active and easily decomposes. As a result, hydrogen bonds are formed between the cellulose acylates, and the shear rate and temperature dependence of the melt viscosity increase.
- the amount of residual sulfuric acid in the cellulose acylate according to the present invention is preferably Oppm to 100 ppm, more preferably 0 to 80 ppm, and further preferably 0 to 60 ppm.
- the “residual sulfuric acid amount” as used herein is calculated as elemental sulfur, and is expressed as a mass fraction of the total amount of elemental sulfur obtained by quantifying cellulose acylate by atomic absorption spectrometry. Is.
- the residual sulfuric acid content of cellulose acylate can be adjusted to Oppm to 100ppm by washing the atomized cellulose acylate in a warm bath.
- the preferable particle diameter of the cell mouth mono-succinate is 10 ⁇ mm to: Lmm, more preferably 30 ⁇ mm to 500 ⁇ mm, and still more preferably 50 ⁇ mm to 300 ⁇ mm (the usual method). so
- the prepared product is in the shape of flakes of 3 mm or more).
- the cleaning efficiency can be increased by increasing the surface area by forming fine particles.
- the cellulose acylate thus obtained can be washed with water to make the residual sulfuric acid content of the cellulose acylate Oppm to 100ppm.
- the temperature of the washing water is preferably 50 ° C to 100 ° C, more preferably 60 ° C to 98 ° C, and further preferably 65 ° C to 95 ° C. This is because cellulose acylate has a Tg of 50-60 ° C due to water content in water, which greatly improves the cleaning efficiency.
- the number of washings at this time is preferably 3 to 20 times, more preferably 4 to 15 times, and further preferably 5 to 10 times.
- Senorelose acylate containing 1 ppm to 500 ppm of at least one of acetic acid, propionic acid, butyric acid, and valeric acid
- acetic acid, propionic acid, butyric acid, and valeric acid in cellulose acylate, formation of hydrogen bonds between cellulose acylates can be prevented by forming residual hydroxyl groups and hydrogen bonds.
- the amount of these acids present is preferably from 1 ppm to 500 ppm relative to cellulose acylate, more preferably from 5 ppm to 300 ppm, and even more preferably from 10 ppm to 20 Oppm. It is preferable that the amount of this range is present after film formation U ,.
- These acids may be present alone or in combination of two or more. These acids may be added at any timing, for example, when the cellulose acylate is pelletized, or may be added during melt film formation. Since these acid concentrations act in the die force extrusion process, which is the final step of the melting process, it is preferable that the above-mentioned concentrations be used at this stage. That is, since it is solidified immediately after exiting the die, the concentration in the film needs to be in the above range.
- the amount of these acids present in the film can be determined by dissolving cellulose acylate in a good solvent (for example, dichloromethane) and using gas chromatography under the conditions described later.
- 1 ppm to 20 Oppm of alkali metal ions in cellulose acylate By containing 1 ppm to 20 Oppm of alkali metal ions in cellulose acylate, the residual hydroxyl groups in cellulose acylate are masked, and the temperature and shear rate dependence of the melt viscosity due to hydrogen bonding between hydroxyl groups is reduced. can do.
- Alkali metal ions can be contained in any form of inorganic salt (e.g., sodium halide, sodium sulfate, sodium nitrate) or organic salt (e.g., sodium carbonate, sodium acetate, sodium propionate, etc.) Acid salt).
- inorganic salt e.g., sodium halide, sodium sulfate, sodium nitrate
- organic salt e.g., sodium carbonate, sodium acetate, sodium propionate, etc.
- the following additives may be added to the cellulose acylate.
- plasticizer examples include alkylphthalylalkyl glycolates, phosphate esters and carboxylic acid esters, polyhydric alcohol plasticizers (eg, ester derivatives of polyhydric alcohols), and the like.
- alkyl phthalyl alkyl glycolates include, for example, methyl phthalyl methylol glycolate, ethino lephthalino eno eno glycolate, propino retinal repropino glycolate, butyl phthalyl butyl dalicolate, Octyl phthalyl octyl dalicolate, methyl phthalyl ethyl dalicolate, ethyl phthalyl methyl dalicolate, ethino phthalinole propyl glycolate, methyl phthalyl butyl dalicolate, ethyl phthalyl butyl dalicolate, Butylphthalylmethyl dallicolate, butyl phthalyl ethyl dallicolate, propyl phthalyl butyl dallicolate, butyl phthalyl propyl glycolate, methyl phthalyl octyl glycolate, ethyl phthalyl
- Examples of the phosphoric acid ester include triphenyl phosphate, tricresyl phosphate, and phenyl diphosphate. Furthermore, it is preferable to use a phosphate ester plasticizer according to claims 3 to 7 of JP-T-6-501040. As mentioned above, phosphate ester has the effect of promoting crystallization of cellulose acylate and generating streaks, but this effect can be suppressed by using this low molecular weight compound together. For this reason, it is also possible to use this low molecular compound in combination with a phosphate ester.
- carboxylic acid esters examples include phthalic acid esters such as dimethyl phthalate, jetyl phthalate, dibutyl phthalate, dioctyl phthalate, and jetyl hexyl phthalate; And citrate esters such as acetylacetyl butyl citrate; adipates such as dimethyl adipate, dibutyl adipate, diisobutyl adipate, bis (2-ethylhexyl) adipate, diisodecyl adipate Can be mentioned. In addition, it is preferable to use butyl oleate, methyl acetyl ricinoleate, dibutyl sebacate, triacetin or the like alone or in combination.
- the polyhydric alcohol plasticizer has good compatibility with cellulose acylate, and glycerin ester and diglycerin ester such as glycerin ester and diglycerin ester, and polyethylene.
- examples thereof include polyalkylene glycols such as glycol and polypropylene glycol, and compounds in which an acyl group is bonded to a hydroxyl group of polyalkylene glycol.
- glycerin ester examples include glycerin diacetate stearate, daridine diacetate palmitate, glycerin diacetate myristate, glyceryl diacetate laurate, glycerin diacetate force plate, glycerin diacetate nonanate, glycerin diacetate otatano Glycerol, diacetate heptanoate, glycerol diacetate hexanoate, glycerol diacetate pentanoate, glycerol diacetate, glycerol acetate dicaprate, glycerol acetate dinonanoate, glycerol acetate dioctanoate, glycerol acetate diheptanoate , Glycerol acetate dicaproate, glycerol acetate divalerate, glycerol acetate Tate dibutyrate, glycerin dipropionate force
- glycerol diacetate caprylate glycerol diacetate pelargonate, glycerol diacetate force plate, glycerol diacetate laurate, glycerol diacetate myristate, glycerol diacetate panolemate, glycerol diacetate stearate, glycerol diester Acetate is preferred.
- diglycerin ester examples include diglycerin tetraacetate, diglycerin tetrapropionate, diglycerin tetrabutylate, diglycerin tetravalerate, diglycerin tetrahexanoate, diglycerin tetraheptanoate, Diglycerin Tetracaprylate, Diglycerin Tetrapelargonate, Diglycerin Tetraforce Plate, Diglycerin Tetralaurate, Diglycerin Tetramyristate, Diglycerin Tetrapalmitate, Diglycerin Triacetate Propionate, Diglycerin Triacetate Butyrate, Diglycerin Triacetate valerate, diglycerin triacetate hexanoate, diglycerin triacetate heptanoate, diglycerin triacetate capri Rate, diglycerin triacetate pelargonate, diglycerin triacetate force plate, diglycerin triacetate laurate, diglycerin
- diglycerin tetraacetate, diglycerin tetrapropyrate, diglycerin tetrapropylate, diglycerin tetracaprylate, and diglycerin tetralaurate are preferable.
- polyalkylene glycol examples include polyethylene glycol and polypropylene glycol having an average molecular weight of 200 to 1000, but are not limited thereto, and these can be used alone or in combination. .
- Specific examples of the compound in which the acyl group is bonded to the hydroxyl group of the polyalkylene glycol include polyoxyethylene acetate, polyoxyethylene propionate, polyoxyethylene butyrate, polyoxyethylene valerate, polyoxyethylene.
- plasticizers to the cellulose ⁇ shea acetate film is preferably 0 to 20 weight 0/0, more preferably from 1 to 20 mass%, more preferably from 2 to 15 wt% . These plasticizers may be used in combination of two or more if necessary.
- the fine particles used in the present invention include silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, Mention may be made of magnesium silicate and calcium phosphate.
- Fine particles containing silicon are preferable because they can reduce turbidity, and silicon dioxide is particularly preferable.
- the fine silicon dioxide fine particles preferably have a primary average particle size of 20 nm or less and an apparent specific gravity of 70 gZ liters or more.
- Those having an average primary particle size as small as 5 to 16 nm are more preferred because they can reduce the haze of the film.
- Sight power It weight is 90 to 200 g / liter or more, more preferably 100 to 200 g / liter or more.
- a higher apparent specific gravity is preferable because a high-concentration dispersion can be produced, and haze and aggregates are improved.
- These fine particles usually form secondary particles having an average particle size of 0.1 to 3.0 m, and these fine particles exist in the film as aggregates of primary particles. Concavities and convexities of 0.1 to 3.0 m are formed on the surface.
- the secondary average particle size is preferably 0.2 m to l. 5 m, more preferably 0.4 / ⁇ ⁇ to 1.2 / zm force, and most preferably 0.6 / ⁇ ⁇ to 1.1 m force. .
- the primary or secondary particle size was determined by observing the particles in the film with a scanning electron microscope and taking the diameter of the circle circumscribing the particles as the particle size. In addition, 200 particles were observed at different locations, and the average value was taken as the average particle size.
- Examples of the silicon dioxide fine particles include commercially available products such as Aerosil R972, R972V, R974, R812, 200, 200V, 300, R202, 0X50, TT600 (above, Enomoto Aerosil Co., Ltd.). Can be used.
- the fine particles of zirconium oxide are commercially available, for example, under the trade names of Aerosil R976 and R811 (above, Nippon Aerosil Co., Ltd.), and these can be used.
- Aerosil 200V and Aerosil R972V are fine particles of silicon dioxide with a primary average particle size of 20 nm or less and an apparent specific gravity of 70 gZ liters or more, while keeping the turbidity of the optical film low. It is particularly preferable because it has a great effect of reducing the friction coefficient.
- ultraviolet ray inhibitors eg, hydroxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, cyanoacrylate compounds, etc.
- deterioration inhibitors eg, antioxidants, Peroxide decomposing agents, radical inhibitors, metal deactivators, acid scavengers, amines, etc.
- infrared absorbers e.g., optical modifiers, surface active agents and odor trapping agents (ammine, etc.)
- the infrared absorber infrared absorbing dye
- the ultraviolet ray inhibitor for example, JP-A-2001-151901.
- epoxy compounds for example, JP-A-51-70316 JP-A-10-306175, JP-A-57-78431, JP-A-54-157159, JP-A-55-13765, and phosphite compounds (JP-A-2004-182979).
- phosphites for example, JP-A-51-70316 JP-A-10-306175, JP-A-57-78431, JP-A-54-157159, JP-A-55-13765, and phosphite compounds (JP-A-2004-182979).
- optical adjusting agent examples include a letter decision adjusting agent.
- a letter decision adjusting agent JP-A-2001-166144, JP-A-2003-344655, JP-A-2003-248117, JP-A-2003- The one described in Japanese Patent No. 66230 can be used, whereby the in-plane retardation (Re) and the thickness direction letter retardation (Rth) can be controlled.
- a preferable addition amount of the optical adjusting agent is 0 to L0% by mass, more preferably 0 to 8% by mass, and even more preferably. It is preferably 0 to 6% by mass.
- the cellulose acylate and the additive are pelletized prior to melt film formation.
- the water content is 0.5% by mass or less, and then a twin-screw kneading extruder is used.
- 150 ° C to 250 ° C, more preferably 160 ° C to 230 ° C, more preferably 170 ° C It can be produced by melting at ⁇ 220 ° C and then extruding into a noodle shape, solidifying in water and cutting.
- U ⁇ is preferred that Lmm ⁇ 30 mm length.
- the cellulose acylate and the additive it is preferable to directly mix the cellulose acylate and the additive, as described in JP-A-2000-352620 (using the cellulose acylate and the additive as a solvent).
- the method of dissolving and mixing and then drying again is not preferred. This is because residual solvent exists even after drying, and this becomes bubbles in the melt film forming process.
- the moisture content in the pellet is preferably 1% prior to the melt film formation. In the following, it is more preferably 0.5% or less, and then it is put into a hopper of a melt extruder. At this time, the hopper is preferably 20 ° C to 110 ° C, more preferably 40 ° C to 100 ° C, and further preferably 50 ° C to 90 ° C. At this time, it is more preferable to seal an inert gas such as nitrogen in the hopper.
- the barrel temperature of the melt extruder is preferably 170 ° C to 250 ° C, more preferably 180 ° C to 240 ° C, and further preferably 190 ° C to 230 ° C.
- the temperature in the barrel may be constant or may be divided into a plurality of temperatures and controlled. In this case, it is more preferable to raise the temperature from the inlet side to the outlet side.
- LZD ratio of screw length (L) to diameter (D)
- the preferred screw diameter is 10mm ⁇ 300mm, more Preferably, it is 20 mm to 200 mm, more preferably 30 mm to: LOOmm.
- the residence time of the cellulose acylate resin in the barrel is preferably 2 minutes to 30 minutes, more preferably 3 minutes to 20 minutes, and even more preferably 4 minutes to 15 minutes. Furthermore, it is preferable to carry out the inside of the melt extruder in an inert (nitrogen or the like) air stream or while evacuating it using a vented extruder so as to suppress decomposition of cellulose acylate.
- a T-die or a force T-die that can preferably use a hanger coat die is preferable. Extrusion may be performed in a single layer, or multiple layers may be extruded using a multi-hold die or a feed block die. At this time, the thickness unevenness in the width direction can be adjusted by adjusting the distance between the lips of the die.
- the cellulose acylate is extruded onto a casting drum.
- an electrostatic application method an air knife method, an air chamber method, a vacuum nozzle method, a touch roll method, or the like to increase the adhesion between the casting drum and the melt-extruded film.
- Such an adhesion improving method may be performed on the entire surface of the melt-extruded film or on a part (for example, both ends).
- the touch roll method at the time of casting.
- the melt discharged from the die is sandwiched between a casting drum and a touch roll and cooled and solidified.
- a casting drum for example, after the cellulose acylate melt (melt) 3 is fed from the extruder 1 through the die 2 onto the first casting roll 11 and brought into contact with the touch roll 4, the second casting roll is further added. 12 and then to the third castor roll 13
- the non-uniformity when the die force as described above is also extruded both surfaces are loosely soft and soft and the structure is high and the center is highly oriented and hard
- both soft surface layers can be pressed and hardened with a touch roll to form a hard layer with the same high orientation as the central portion.
- the material of the touch roll is preferably one having elasticity. As a result, the excessive surface pressure can be absorbed by deformation of the touch roll.
- the outer cylinder thickness Z is preferably between 0.05 mm and 7. Omm. Preferably, it is 0.2 mm to 5. Omm. More preferably 0.3mn! ⁇ 2. Omm.
- an elastic body layer is provided on a type with elasticity or a metal shaft, and the outer cylinder is placed thereon, and a liquid medium layer is provided between the elastic body layer and the outer cylinder.
- a Tachiroll film with an ultra-thin outer cylinder.
- Casting rolls and touch rolls preferably have a mirror surface with an arithmetic average height Ra of preferably 100 nm or less, more preferably 50 nm or less, and even more preferably 25 nm or less.
- the one described in the issue pamphlet can be used.
- the touch roll is filled with fluid inside the thin outer cylinder, when it is brought into contact with the casting roll, it is elastically deformed into a concave shape by the pressing. Therefore, since the touch roll and the casting roll are in surface contact, the pressure is dispersed, and a low surface pressure can be achieved. For this reason, it is possible to correct fine irregularities on the surface without leaving residual strain in the film sandwiched between them.
- the preferred linear pressure of touch roll is 3 kg / cm to: L00 kg / cm, more preferably 5 kg Zcm to 80 kg Zcm, and still more preferably 7 kg Zcm to 60 kg Zcm.
- the linear pressure referred to here is a value obtained by dividing the force applied to the touch roll by the width of the discharge port of the die. If the linear pressure is 3 kg / cm or more, the surface layer and the inside will be unevenly corrected by pressing the Tachiroll moderately, and it will be easy to obtain cutting cutting improvement effects. Moreover, if the linear pressure is less than lOOkgZcm, it is easy to prevent brittleness due to high orientation and to suppress cutting waste.
- the temperature of the touch roll is preferably set to 60 ° C to 160 ° C, more preferably 70 ° C to 150 ° C, and further preferably 80 ° C to 140 ° C.
- Such temperature control can be achieved by passing a temperature-controlled liquid or gas through the roll.
- the surface temperature of the casting drum is preferably 60 ° C to 160 ° C, more preferably 70 ° C to 150 ° C, and still more preferably 80 ° C to 140 ° C.
- the cellulose silicate film unstretched cellulose acrylate film
- the winding speed is preferably 10 mZ min to 10 mZ min, more preferably 15 mZ min to 80 mZ min, and even more preferably 20 mZ min to 70 mZ min. Thickness can be adjusted even at the speed of scraping.
- the film is preferably trimmed at both ends and wound up.
- the trimmed part is pulverized, or subjected to granulation or depolymerization / re-polymerization as necessary, and then used as a film material of the same type or as a film material of a different type. It may be reused.
- the thickness of the preferred laminate film is 1 to 100 m, more preferably 10 to 70 ⁇ m.
- knurling width is l-50mm, more preferably 2-30mm
- height is preferably 10: LOO / zm, more preferably 20-80m
- position from both ends is preferably 0-50mm, more preferred Is 0-30mm.
- a preferable winding tension is 1 kg / m to 50 kg / m, more preferably 2 kg / m to 40 kg / m.
- a winding tension of lkg / m width or more is preferable because the film can be easily wound evenly. If the take-up tension is 50 kg / width or less, the film will not become stiff and the winding appearance will be beautiful. There is no residual birefringence caused by the elongation of the film. It is preferable that the winding tension is detected by tension control in the middle of the line and wound while being controlled so as to have a constant winding tension. If there is a difference in film temperature depending on the location of the film production line, the film length will slightly increase due to thermal expansion. Since there may be differences, it is necessary to adjust the draw ratio between the rolls so that tension exceeding the specified level is not applied to the film in the middle of the line.
- the take-up tension is a force that can be taken up at a constant tension by controlling the tension control. It is more preferable to taper the take-up tension according to the diameter of the take-up to obtain an appropriate take-up tension. Generally, the tension is gradually reduced as the winding diameter increases, but in some cases, it may be preferable to increase the tension as the winding diameter increases.
- Re and Rth respectively represent in-plane retardation and thickness direction letter retardation at a wavelength of 590 nm.
- Re is measured with KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments) with light at a wavelength of 590 nm incident in the normal direction of the film.
- Rth is calculated by the following method.
- Rth uses Re as the slow axis (determined by KOBRA 21ADH or WR) in the plane as the tilt axis (rotary axis) (if there is no slow axis, any direction in the film plane is the rotational axis)
- the tilted directional force is measured at a total of 11 points at 10 ° step from 50 ° to + 50 ° from the normal direction with respect to the film normal direction.
- K OBRA 21ADH or WR calculates based on the obtained retardation value, average refractive index, and input film thickness value.
- the slow axis is the tilt axis (rotating axis) (if there is no slow axis, it is Measure the retardation value from any two inclined directions, and based on the value, average refractive index and input film thickness value, the following formulas (b) and ( Calculate Rt h from c).
- Re ( ⁇ ) represents the retardation value in the direction inclined by angle ⁇ from the normal direction.
- nx represents the refractive index in the slow axis direction in the plane
- ny represents the refractive index in the direction perpendicular to nx in the plane
- nz represents the refractive index in the direction perpendicular to nx and ny.
- Rth is calculated by the following method.
- Rth is Re
- the in-plane slow axis (determined by KOBRA 21ADH or WR) is the tilt axis (rotation axis) in the normal direction of the film at -50 degrees to +50 degrees in 10 degree steps.
- Each tilted directional force is also measured at 11 points with light having a wavelength of 590 nm incident, and KOB RA 21ADH or WR is calculated based on the measured letter value, average refractive index, and input film thickness value. .
- KOBRA 21ADH or WR calculates nx, ny, and nz.
- Nz (nx ⁇ nz) Z (nx ⁇ ny) is further calculated from the calculated nx, ny, and nz.
- the total light transmittance of the unstretched cellulose acylate film is preferably 90% to 100%, more preferably 91 to 99%, and still more preferably 92 to 98%.
- the preferred haze is 0 to 1%, more preferably 0 to 0.8%, still more preferably 0 to 0.6%.
- the thickness unevenness is preferably 0% to 4% in both the longitudinal direction and the width direction, more preferably 0% to 3%. %, More preferably 0% to 2%.
- Tensile modulus 1. 5kNZmm 2 ⁇ 3. 5kNZmm more preferably 2 preferably tool 1. 7kN Zmm 2 ⁇ 2. 8kNZmm 2 , more preferably 1. 8kNZmm 2 ⁇ 2. 6k
- the elongation at break is from 3% to more preferably 5% to 80%, more preferably 8% to 50%, more preferably LOO%.
- Tg (which refers to the Tg of the film, ie, the Tg of the mixture of cellulose acylate and additive) is preferably 95 ° C to 145 ° C, more preferably 100 ° C to 140 ° C, and even more preferably 105 ° C. ° C to 13 5 ° C.
- the thermal dimensional change at 80 ° C 'l day is preferably 0% to 1% in both vertical and horizontal directions, more preferably 0% to 0.5%, more preferably 0% to 0.3%. It is.
- 40 ° C 'relative humidity water permeability at 90% 300gZm 2' Date ⁇ lOOOgZm 2 'Date Ri is by preference tool preferably 400gZm 2' ⁇ 900gZm 2 ' ⁇ , more preferably 500gZm 2' ⁇ 800 g / m 2 -day.
- the equilibrium moisture content at 25 ° C 'relative humidity 80% is preferably 1% to 4% by weight, more preferably 1.2% to 3%, and even more preferably 1.5% to 2%. 5% by weight.
- the unstretched cellulose acylate film formed by the above method can be used as it is as the cellulose acylate film of the present invention.
- the film may be stretched.
- the Re and Rth of the film can be controlled.
- Stretching is preferably carried out at Tg to Tg + 50 ° C, more preferably Tg + 3 ° C to Tg + 30 ° C, more preferably at Ding 8 + 5 to Ding 8 + 20 .
- a preferred draw ratio is 1% to 300%, more preferably 2% to 250%, and still more preferably 3% to 200% on at least one side. Although it may be stretched evenly in the vertical and horizontal directions, it is more preferable to stretch one of the stretch ratios more than the other and unevenly stretch. Either length (MD) or width (TD) may be increased, but the smaller stretch ratio is preferably 1% to 30%, more preferably 2% to 25%, and even more preferably 3 % To 20%. The larger draw ratio is 30% to 300%, more preferably 35% to 200%, and still more preferably 40% to 150%. These stretching is performed in one stage. Alternatively, it may be performed in multiple stages. The draw ratio here is determined using the following equation.
- Stretch ratio (%) ⁇ ⁇ (Length after stretching)-(Length before stretching) ⁇ Z (Length before stretching)
- Such stretching may be performed in the longitudinal direction using two or more pairs of up-rolls with increased peripheral speed on the outlet side (longitudinal stretching), and both ends of the film are gripped with chucks and orthogonal to each other. It may be spread in the direction (perpendicular to the longitudinal direction) (lateral stretching). Further, the simultaneous biaxial stretching method described in JP-A No. 2000-37772, JP-A No. 2001-113591 and JP-A No. 2002-103445 may be used.
- the ratio of Re and Rth in the case of longitudinal stretching, it can also be achieved by controlling the value (aspect ratio) obtained by dividing the gap between the rolls by the film width. That is, the RthZRe ratio can be increased by reducing the aspect ratio.
- Re and R th can be controlled by combining longitudinal stretching and lateral stretching. That is, Re can be reduced by reducing the difference between the longitudinal draw ratio and the transverse draw ratio, and Re can be increased by increasing this difference.
- Re and Rth of the cellulose acylate film thus stretched satisfy the following formula.
- the angle ⁇ formed by the film forming direction (longitudinal direction) and the slow axis of Re of the film is preferably as close as 0 °, + 90 °, or 90 °. That is, in the case of longitudinal stretching, the closer to 0 °, the more preferable 0 ⁇ 3 ° is more preferable, 0 ⁇ 2 ° is more preferable, and 0 ⁇ 1 ° is still more preferable.
- 90 ⁇ 3 ° or -90 ⁇ 3 ° is preferred, more preferably 90 ⁇ 2 ° or 90 ⁇ 2 °, even more preferably 90 ⁇ 1 ° or 90 ⁇ 1 ° It is.
- the thickness of the cellulose acylate film after stretching is preferably 15 ⁇ m to 200 ⁇ m, more preferably 30 m to 170 m, and even more preferably 40 ⁇ m to 140 ⁇ m.
- the thickness unevenness is preferably 0% to 3% in both the longitudinal direction and the width direction, more preferably 0% to 2%, and still more preferably 0% to 1%.
- the physical properties of the cellulose acylate film after stretching are preferably in the following range.
- the elongation at break is from 3% to L00%, more preferably from 5% to 80%, and even more preferably from 8% to 50%.
- Tg (which refers to the Tg of the film, ie, the Tg of the mixture of cellulose acylate and additive) is preferably 95 ° C to 145 ° C, more preferably 100 ° C to 140 ° C, and even more preferably 105 ° C. ° C to 13 5 ° C.
- Thermal dimensional change at 80 ° C'l in both vertical and horizontal directions is preferably 0% to 1%, more preferably 0% to 0.5%, more preferably 0% to 0.3%. It is.
- 40 ° C 'relative humidity water permeability at 90% 300gZm 2' Date ⁇ lOOOgZm 2 'Date Ri is by preference tool preferably 400gZm 2' ⁇ 900gZm 2 ' ⁇ , more preferably 500gZm 2' ⁇ 800 g / m 2 -day.
- the equilibrium moisture content at 25 ° C 'relative humidity 80% is preferably 1% to 4% by weight, more preferably 1.2% to 3%, and even more preferably 1.5% to 2%. 5% by weight.
- the thickness is preferably 30 ⁇ m to 200 ⁇ m force S, more preferably 40 ⁇ m to 180 ⁇ m, and even more preferably 50 ⁇ m to 150 ⁇ m.
- the haze is 0% to 3%, more preferably 0% to 2%, and still more preferably 0% to 1%.
- the total light transmittance is preferably 90% to 100%, more preferably 91% to 99%, and even more preferably It is 92% to 98%.
- the cellulose acylate film of the present invention can be adhered to each functional layer (for example, the undercoat layer and the back layer) by performing surface treatment on any of the unstretched and stretched cellulose acylate films.
- An improvement can be achieved.
- glow discharge treatment, ultraviolet irradiation treatment, corona treatment, flame treatment, acid or alkali treatment can be used.
- the “glow discharge treatment” here is a treatment for subjecting the film surface to a plasma treatment in the presence of a plasma-exciting gas.
- the glow discharge treatment includes a low temperature plasma treatment performed under a low pressure gas of 10 ⁇ 3 to 20 Torr (0.13 to 2700 Pa). Plasma treatment under atmospheric pressure is also a preferable glow discharge treatment.
- the plasma-excitable gas refers to a gas that is plasma-excited under the above-described conditions, such as argon, helium, neon, krypton, xenon, nitrogen, carbon dioxide, fluorocarbons such as tetrafluoromethane, and the like. And the like. Details of these are described on pages 30-32 of the Japan Society for Invention and Innovation (Public Technical Number 2001-1745, published on March 15, 2001).
- the plasma treatment at atmospheric pressure which has been attracting attention in recent years, is, for example, 10 to: 20 to 500 kGy of irradiation energy under LOOOkeV, more preferably 20 to 300 kGy of irradiation energy under 30 to 500 keV. It is done.
- an alkali hatching treatment is particularly preferable, and it is extremely effective as a surface treatment for a cellulose acylate film.
- JP-A-2003-3266, 2003-229299, 2004-322928, 2005-76088 and the like can be used.
- the alkaline solution treatment may be dipped in a solution (immersion method) or may be applied with a solution (application method).
- immersion method after passing an aqueous solution having a pH of 10 to 14 such as NaOH or KOH to a temperature of 20 to 80 ° C. for 0.1 to 10 minutes, neutralization, washing with water and drying are performed. Can be achieved.
- Alkaline hatching coating solution solvent for coating on transparent support of hatching solution It is preferable to select a solvent that has good wettability and that keeps the surface state good without forming irregularities on the surface of the transparent support by the hatching solvent. Specifically, isopropyl alcohol is preferred because alcohol-based solvents are preferred. An aqueous solution of a surfactant can also be used as a solvent.
- the alkali of the alkaline solution coating solution is more preferably KOH or NaOH, preferably an alkali that dissolves in the solvent.
- the pH of the hatching coating solution is preferably 10 or more, more preferably 12 or more.
- the reaction conditions during alkaline acidification are preferably 1 second to 5 minutes at room temperature, more preferably 5 seconds to 5 minutes, and particularly preferably 20 seconds to 3 minutes. After the alkali hatching reaction, it is preferable to wash the water-coated surface with water or acid and then wash with water. Moreover, the coating-type hatching process and the alignment film uncoating described later can be performed continuously, thereby reducing the number of steps. Specific examples of these acid oxidation methods include the description in Japanese Patent Publication No. 2002-82226 and International Publication WO02Z46809.
- An undercoat layer is preferably provided on the cellulose acylate film in the invention in order to improve adhesion to the functional layer. This layer may be applied after the surface treatment or without any surface treatment. The details of the undercoat layer are described on page 32 of the Japan Institute of Invention and Technology (public technical number 2001-1745, published on March 15, 2001, Japan Institute of Invention and Innovation).
- the stretched and unstretched cellulose acylate films of the present invention are described in detail in the Invention Association's published technical bulletin (public technical number 2001-1745, issued March 15, 2001, Invention Association), pages 32-45. It is preferable to combine functional layers. Among them, preferred are application of polarizing film (polarizing plate), application of optical compensation layer (optical compensation film), application of antireflection film (antireflection film), and application of hard coat layer.
- polarizing films use stretched polymers for iodine in the bath or dichroic dyes. In general, it is prepared by immersing in a solution of the above and allowing iodine or a dichroic dye to penetrate into the binder.
- a coating type polarizing film represented by Optiva Inc. can also be used. Iodine and dichroic dye in the polarizing film exhibit deflection performance by being oriented in the binder.
- the dichroic dye an azo dye, a stilbene dye, a pyrazolone dye, a triphenolate dye, a quinoline dye, an oxazine dye, a thiazine dye or an anthraquinone dye is used.
- the dichroic dye is preferably water-soluble.
- the dichroic dye preferably has a hydrophilic substituent (eg, sulfo, amide-containing hydroxyl).
- a hydrophilic substituent eg, sulfo, amide-containing hydroxyl
- the binder of the polarizing film either a polymer that can be crosslinked by itself or a polymer that is crosslinked by a crosslinking agent can be used, and a plurality of combinations thereof can be used.
- the binder include a metatarylate-based copolymer, a styrene-based copolymer, a polyolefin, a polyvinyl alcohol, a modified polybulal alcohol, and a poly (N—) described in paragraph No. [0022] of JP-A-8-338913.
- Polystyrene resin e.g., poly (N-methylol acrylamide), carboxymethyl cellulose, gelatin, polybulal alcohol, and modified polybulal alcohol
- Water-soluble polymers eg, poly (N-methylol acrylamide), carboxymethyl cellulose, gelatin, polybulal alcohol, and modified polybulal alcohol
- More preferred are polyvinyl alcohol and modified polyvinyl alcohol.
- the degree of hatching of polybulal alcohol is preferably 70 to 100% strength S, more preferably 80 to 100%.
- the degree of polymerization of polybulal alcohol is preferably 100 to 5,000.
- modified polychori, ninoleanoreconole described in JP-A-8-338913, JP-A-9152509 and JP-A-9-316127.
- Polybulal alcohol and modified polybulal alcohol may be used in combination of two or more.
- the lower limit of the thickness of the Norder is preferably 10 m.
- the upper limit of the thickness is preferably as thin as possible from the viewpoint of light leakage of the liquid crystal display device.
- Commercially available polarizing plate (approx. 30 m) It is preferable that the following is 25 m or less, more preferably 20 m or less.
- the polarizing film binder is cross-linked! /!
- a polymer having a crosslinkable functional group or a monomer may be mixed in the binder, or the crosslinkable functional group may be imparted to the binder polymer itself.
- Crosslinking can be performed by light, heat, or pH change, and can form a noinder with a crosslinked structure.
- the crosslinking agent is described in US Reissue Pat. No. 232 97. Boron compounds (eg, boric acid, borax) can also be used as a crosslinking agent.
- the amount of the crosslinking agent added to the binder is preferably 0.1 to 20% by mass relative to the binder. The orientation of the polarizing element and the wet heat resistance of the polarizing film are improved.
- the unreacted crosslinking agent is preferably 1.0% by mass or less, and more preferably 0.5% by mass or less. By doing so, the weather resistance is improved.
- the polarizing film is preferably dyed with iodine or a dichroic dye after the force for stretching the polarizing film (stretching method) or rubbing (rubbing method).
- the stretching ratio is preferably 2.5 to 30.0 times, more preferably 3.0 to 10.0 times. Stretching can be performed by dry stretching in air. In addition, wet stretching may be performed while immersed in water. The draw ratio of dry drawing is preferably 2.5 to 5.0 times. The draw ratio of wet drawing is preferably 3.0 to LO. Stretching may be performed parallel to the MD direction (parallel stretching), or may be performed in an oblique direction (oblique stretching). These stretching operations may be performed once or divided into several times. By dividing into several times, it is possible to stretch more uniformly even at high magnification. More preferred is oblique stretching in which the film is stretched with an inclination of 10 ° to 80 ° in the oblique direction.
- the film Prior to stretching the polarizing film, for example, it is preferable to swell the PVA film.
- the degree of swelling is 1.2 to 2.0 times (mass ratio between before swelling and after swelling).
- the film is stretched at a bath temperature of 15 to 50 ° C, especially 17 to 40 ° C, in an aqueous medium bath or a dye bath for dissolving a dichroic material while being continuously conveyed through a guide roll or the like.
- Stretching can be achieved by gripping with two pairs of up-rolls and increasing the transport speed of the rear-stage rolls higher than that of the previous stage.
- the draw ratio is After stretching z Based on the length ratio in the initial state (hereinafter the same), the stretching ratio is preferably 1.2 to 3.5 times, and more preferably 1.5 to 3.0 times, in view of the above-mentioned effects. Thereafter, the polarizing film can be obtained by drying at 50 ° C. to 90 ° C.
- oblique stretching method a method of stretching using a tenter protruding in an oblique direction as described in JP-A-2002-86554 can be used. Since this stretching is performed in the air, it is necessary to make it easy to stretch by adding water in advance.
- the moisture content is preferably 5% to 100%
- the stretching temperature is preferably 40 ° C to 90 ° C.
- the humidity during stretching is preferably 50% to 100% relative humidity! /.
- the absorption axis of the polarizing film thus obtained is preferably 10 ° to 80 °, more preferably 3
- the polarizing plate of the present invention can be prepared by laminating the stretched and unstretched cellulose acylate film of the present invention after the oxidation and the polarizing film prepared by stretching.
- the direction in which these are laminated is not particularly limited, but it is preferable that the casting axis direction of the cellulose acylate film and the stretching axis direction of the polarizing plate are 0 °, 45 °, or 90 °. Good.
- the adhesive used for the bonding is not particularly limited, and examples thereof include PVA-based resins (including modified PVA such as acetoacetyl group, sulfonic acid group, carboxyl group, oxyalkylene group, etc.), boron compound aqueous solution, and the like. Of these, PVA-based resin is preferable.
- the thickness of the adhesive layer is preferably 0.01 to 10 m after drying, and particularly preferably 0.05 to 5 m. Examples of the layer structure for laminating the polarizing plate of the present invention include the following.
- BZPZT “A” is the unstretched cellulose acylate film of the present invention, “B” is the stretched cellulose acylate film of the present invention, and “T” is a cellulose triacetate film (Fuji Photo Film Co., Ltd., Fujitac TD80U). Etc.), “ ⁇ ” refers to a polarizing film.
- a and ⁇ may be cellulose acetate having the same composition or different.
- the cocoons may be the same composition cellulose acetate or different, or the same draw ratio or different.
- the polarizing plate of the present invention is incorporated in a liquid crystal display device, either one may be used as a liquid crystal surface, but in the case of component openings) and e), it is more preferable that the ridge is on the liquid crystal side.
- the polarizing plate of the present invention When the polarizing plate of the present invention is incorporated in a liquid crystal display device, a substrate containing liquid crystal is usually disposed between two polarizing plates.
- the polarizing plate of the present invention is a) to e) and normal polarized light.
- Boards ( ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ) can be combined freely.
- the polarizing plate thus obtained preferably has a higher light transmittance and a higher degree of polarization.
- the transmittance of the polarizing plate of the present invention is preferably in the range of 30 to 50%, more preferably in the range of 35 to 50%, and more preferably in the range of 40 to 50% in the light with a wavelength of 550 nm. Most preferably.
- the degree of polarization is most preferably in the range of 99-100%, more preferably in the range of 95-100%, more preferably in the range of 90-100% for light with a wavelength of 550 nm.
- the polarizing plate of the present invention can be laminated with a ⁇ 4 plate to produce circularly polarized light.
- lamination is performed so that the slow axis of ⁇ 4 and the absorption axis of the polarizing plate are 45 °.
- ⁇ 4 is not particularly limited, but more preferably has a wavelength dependency such that the lower the wavelength, the smaller the letter retardation.
- a protective film may be bonded to one surface of these polarizing plates, and a separate film may be bonded to the other surface.
- the protective film and the 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 optically anisotropic layer is for compensating for the liquid crystal compound in the liquid crystal cell in the black display of the liquid crystal display device, and forms an alignment film on the stretched and unstretched cellulose acylate film, and further optically It is formed by applying an anisotropic layer.
- An orientation film is provided on the surface-treated stretched and unstretched cellulose acylate film of the present invention.
- This film has a function of defining the alignment direction of liquid crystalline molecules.
- the alignment film plays its role, so it is not necessarily essential as a component of the optical compensation film of the present invention. It's not something. That is, it is also possible to produce the polarizing plate of the present invention by transferring only the optically anisotropic layer on the alignment film in which the alignment state is fixed onto the polarizer.
- the alignment film can be formed by rubbing an organic compound (preferably a polymer), oblique deposition of an inorganic compound, forming a layer having a microgroup, or an organic compound (eg, ⁇ -tricosane by Langmuir 'Projet method (LB film)). Acid, dioctadecylmethylammonium chloride, methyl stearylate). Furthermore, an alignment film in which an alignment function is generated by application of an electric field, application of a magnetic field or light irradiation is also known. The alignment film is preferably formed by polymer rubbing treatment. In principle, the polymer used for the alignment film has a molecular structure having a function of aligning liquid crystal molecules.
- the cross-linking function in addition to the function of aligning liquid crystal molecules, has a function of bonding side chains having a crosslinkable functional group (eg, double bond) to the main chain or a function of aligning liquid crystal molecules. It is preferable to introduce a functional functional group into the side chain.
- a crosslinkable functional group eg, double bond
- the polymer used for the alignment film either a polymer that can be crosslinked by itself or a polymer that is crosslinked by a crosslinking agent can be used, and a plurality of combinations thereof can be used.
- the polymer include, for example, a metatalylate copolymer, a styrene copolymer, a polyolefin, a polybutanol, a modified polybulualcohol, a poly (poly (alcohol) described in JP-A-8-338913, paragraph No. [0022].
- (Methylolacrylamide) polyester, polyimide, vinyl acetate copolymer, carboxymethyl cellulose, polycarbonate and the like.
- silane coupling agents as polymers. You can. Water-soluble polymers (eg, poly (N-methylolacrylamide), carboxymethylcellulose, gelatin, polybulal alcohol, and modified polybulal alcohol) are preferred. Gelatin, polybulal alcohol, and modified polyvinyl alcohol are more preferred, and polybulualcohol is preferred. And modified polybulal alcohol is most preferred. It is particularly preferable to use two types of polybulal alcohols or modified polybulal alcohols having different degrees of polymerization. The degree of hatching of polybulal alcohol is preferably 70 to 100% strength S, more preferably 80 to: LOO%. The degree of polymerization of polybulal alcohol is 100-5000.
- Water-soluble polymers eg, poly (N-methylolacrylamide), carboxymethylcellulose, gelatin, polybulal alcohol, and modified polybulal alcohol
- Gelatin, polybulal alcohol, and modified polyvinyl alcohol are more preferred, and polybulualcohol is preferred.
- modified polybulal alcohol is most preferred. It is particularly preferable to
- a side chain having a function of aligning liquid crystal molecules generally has a hydrophobic group as a functional group.
- the specific type of functional group is determined according to the type of liquid crystal molecules and the required alignment state.
- the modifying group of the modified polyvinyl alcohol can be introduced by copolymerization modification, chain transfer modification or block polymerization modification.
- modifying groups include hydrophilic groups (carboxylic acid groups, sulfonic acid groups, phosphonic acid groups, amino groups, ammonium groups, amide groups, thiol groups, etc.), hydrocarbon groups having 10 to 100 carbon atoms.
- the crosslinkable functional group of the alignment film polymer preferably contains a polymerizable group in the same manner as the polyfunctional monomer. Specifically, for example, paragraph numbers in the specification of JP-A-2000-155216 [ [0080] to [0100].
- the alignment film polymer can be cross-linked using a cross-linking agent separately from the cross-linkable functional group.
- Crosslinkers include aldehydes, N-methylol compounds, dioxane derivatives, compounds that act by activating carboxyl groups, active vinyl compounds, active halogen compounds, isoxazole and dialdehyde starch. .
- Two or more kinds of crosslinking agents may be used in combination. Specific examples include compounds described in paragraphs [0023] to [0024] in JP-A-2002-62426. Aldehydes with high reaction activity, especially glutaraldehyde are preferred!
- the addition amount of the crosslinking agent is preferably 0.1 to 20% by mass, more preferably 0.5 to 15% by mass with respect to the polymer.
- the amount of the unreacted crosslinking agent remaining in the alignment film is preferably 1.0% by mass or less, and more preferably 0.5% by mass or less.
- the alignment film is basically formed by applying the polymer, which is an alignment film forming material, and a transparent support containing a crosslinking agent, followed by heat drying (crosslinking) and rubbing treatment. Can do.
- the crosslinking reaction may be carried out at any time after coating on the transparent support.
- the coating solution is preferably a mixed solvent of an organic solvent (for example, methanol) having a defoaming action and water.
- the ratio by mass of water: methanol is preferably 0: 100 to 99: 1, and more preferably 0: 100 to 91: 9.
- the coating method of the alignment film is preferably a spin coating method, a dip coating method, a curtain coating method, an etching coating method, a rod coating method or a roll coating method.
- the rod coating method is particularly preferable.
- the film thickness after drying is preferably from 0.1 to LO / zm. Heating and drying can be performed at 20 ° C to 110 ° C. In order to form sufficient crosslinks, 60 ° C to 100 ° C is preferable, and 80 ° C to 100 ° C is particularly preferable.
- the drying time is a force that can be performed from 1 minute to 36 hours, preferably from 1 minute to 30 minutes. It is preferable to set the pH to the optimum value for the cross-linking agent used. When used, the pH is 4.5 to 5.5, and 5 is particularly preferable.
- the alignment film is provided on a stretched'unstretched cellulose acylate film or on the undercoat layer.
- the alignment film can be obtained by rubbing the surface after crosslinking the polymer layer as described above.
- a treatment method widely adopted as a liquid crystal alignment treatment process of LCD can be applied. That is, a method of obtaining the orientation by rubbing the surface of the orientation film in a certain direction using paper, gauze, felt, rubber, nylon, polyester fiber or the like can be used. Generally, it is carried out by rubbing several times using a cloth in which fibers having a uniform length and thickness are averagely planted.
- the wrap angle of the film on the labinda roll is preferably 0.1 to 90 °.
- the film conveyance speed is preferably 1 to 100 mZmin. It is preferable to select an appropriate rubbing angle in the range of 0 to 60 °. When used in a liquid crystal display device, the angle is preferably 40 to 50 °. 45 ° is particularly preferred.
- the film thickness of the alignment film thus obtained is preferably in the range of 0.1 to: LO / zm.
- the liquid crystalline molecules of the optically anisotropic layer are aligned on the alignment film. Thereafter, if necessary, the alignment film polymer is reacted with the polyfunctional monomer contained in the optically anisotropic layer, or the alignment film polymer is crosslinked using a crosslinking agent.
- the liquid crystalline molecules used in the optically anisotropic layer include rod-like liquid crystalline molecules and discotic liquid crystalline molecules.
- the rod-like liquid crystal molecule and the disc-like liquid crystal molecule may be a polymer liquid crystal or a low molecular liquid crystal, and further include those in which a low molecular liquid crystal is cross-linked and does not exhibit liquid crystallinity.
- rod-like liquid crystalline molecules examples include azomethines, azoxys, cyanobiphenyls, cyanophenol esters, benzoic acid esters, cyclohexanecarboxylic acid ester.
- benzene, toluoylcyclohexanes, cyano-substituted ferro-bilimidines, alkoxy-substituted ferro-bilimidines, ferrodioxanes, tolans and alkarylcyclohexylbenzo-tolyl are preferably used.
- the rod-like liquid crystalline molecule includes a metal complex.
- a liquid crystal polymer in which rod-like liquid crystalline molecules are repeatedly contained in a unit can also be used as the rod-like liquid crystalline molecules.
- the rod-like liquid crystal molecule may be bonded to a (liquid crystal) polymer.
- the birefringence of the rod-like liquid crystal molecule is preferably in the range of 0.001 to 0.7.
- the rod-like liquid crystal molecule preferably has a polymerizable group in order to fix its alignment state.
- the polymerizable group is preferably a radically polymerizable unsaturated group or a cationically polymerizable group.
- Examples thereof include a polymerizable group and a polymerizable liquid crystal compound.
- Discotic liquid crystal molecules include C. Destrade et al., Benzene derivatives described in Mol. Cry st. 71 ⁇ , p. 111 (1981), C. Destrade et al. Molx Cryst. 122, 141 (1985), Physics lett, A, 78, 82 (1990), a research report by B. Kohne et al., Angew. Chem. 96 ⁇ , page 70 (1984) and cyclohexane derivatives described in JM Lehn et al., J. Chem. Commun., 1794 (1985), J. Zhang et al., J. Am. Chem. Soc. 116 ⁇ , page 2655 (1994), and other crown crowns and phenylacetylene macrocycles are included.
- the discotic liquid crystalline molecule a liquid crystal having a structure in which a linear alkyl group, an alkoxy group, and a substituted benzoyloxy group are radially substituted as a side chain of the mother nucleus with respect to the mother nucleus at the center of the molecule. Also included are compounds that exhibit sex.
- the molecule or the assembly of molecules is preferably a compound having rotational symmetry and capable of imparting a certain orientation.
- the compound finally contained in the optically anisotropic layer contains the discotic liquid crystalline component.
- a low-molecular discotic liquid crystalline molecule has a group that reacts with heat or light, and as a result, it is polymerized or cross-linked by reaction with heat or light, resulting in a high molecular weight and liquid crystal properties. Missing compounds are also included.
- Preferred examples of the discotic liquid crystalline molecules are described in JP-A-8-50206.
- the polymerization of discotic liquid crystalline molecules is described in JP-A-8-27284.
- the discotic core and the polymerizable group are preferably a compound that is bonded via a linking group, whereby the orientation state can be maintained in the polymerization reaction. Examples thereof include compounds described in paragraphs [015 1] to [0168] of JP-A 2000-155216.
- the angle force between the major axis (disk surface) of the discotic liquid crystalline molecule and the plane of the polarizing film increases or decreases in the depth direction of the optically anisotropic layer and with the increase of the surface force distance of the polarizing film. is doing.
- the angle preferably decreases with increasing distance.
- the angle change can be continuous increase, continuous decrease, intermittent increase, intermittent decrease, change including continuous increase and continuous decrease, or intermittent change including increase and decrease.
- the intermittent change includes a region where the inclination angle does not change in the middle of the thickness direction. The angle only needs to increase or decrease as a whole even if it includes a region where the angle does not change. Furthermore, it is preferable that the angle changes continuously.
- the average direction of the major axis of the discotic liquid crystalline molecules on the polarizing film side is generally adjusted by selecting a discotic liquid crystalline molecule or an alignment film material or by selecting a rubbing treatment method. Can do.
- the major axis (disk surface) direction of the surface side (air side) discotic liquid crystalline molecules is generally adjusted by selecting the type of additive used with the discotic liquid crystalline molecules or discotic liquid crystalline molecules. be able to. Examples of the additive used together with the discotic liquid crystalline molecule include a plasticizer, a surfactant, a polymerizable monomer, and a polymer.
- the degree of change in the major axis orientation direction can be adjusted by selecting the liquid crystalline molecule and the additive as described above.
- liquid crystal molecules Along with the liquid crystal molecules, a plasticizer, a surfactant, a polymerizable monomer, etc. are used in combination.
- the uniformity of the coating film, the strength of the film, the orientation of liquid crystal molecules, etc. can be improved. It is preferable that the liquid crystal molecules have compatibility with the liquid crystal molecules and do not inhibit the force or orientation that can change the tilt angle of the liquid crystal molecules.
- the polymerizable monomer examples include radically polymerizable or cationically polymerizable compounds.
- it is a polyfunctional radically polymerizable monomer and is preferably copolymerizable with the above-mentioned polymerizable group-containing liquid crystal compound. Examples thereof include those described in paragraph numbers [0018] to [0020] in JP-A-2002-296423.
- the amount of the compound added is generally in the range of 1 to 50% by mass and preferably in the range of 5 to 30% by mass with respect to the discotic liquid crystalline molecules.
- surfactant examples include conventionally known compounds, and fluorine compounds are particularly preferable. Specific examples include compounds described in paragraph numbers [0028] to [0056] in JP-A-2001-330725.
- the polymer used together with the discotic liquid crystalline molecules can change the tilt angle of the discotic liquid crystalline molecules.
- a cellulose ester can be mentioned as an example of the polymer.
- Preferable examples of the cellulose ester include those described in paragraph No. [0178] of JP-A No. 2000-155216.
- the addition amount of the polymer is preferably in the range of 0.1 to L0 mass% with respect to the liquid crystalline molecules so as not to disturb the alignment of the liquid crystalline molecules. More preferably, it is in the range.
- the discotic nematic liquid crystal phase—solid phase transition temperature of the discotic liquid crystalline molecules is preferably 70 to 300 ° C, more preferably 70 to 170 ° C! /.
- the optically anisotropic layer can be formed by applying a coating liquid containing liquid crystalline molecules and, if necessary, a polymerization initiator described later and optional components on the alignment film.
- organic solvent As a solvent used for preparing the coating solution, an organic solvent is preferably used.
- organic solvents include amides (eg, N, N-dimethylformamide), sulfoxides (eg, dimethyl sulfoxide), heterocyclic compounds (eg, pyridine), hydrocarbons (eg, benzene, hexane), alkyl halides (eg, E.g.
- dichloromethane tetrachloroethane
- ester e.g., Methyl acetate, butyl acetate
- ketones e.g, acetone, methyl ethyl ketone
- ethers eg, tetrahydrofuran, 1,2-dimethoxyethane
- Alkyl halides and ketones are preferred. Two or more organic solvents may be used in combination.
- the coating solution can be applied by a known method (eg, wire bar coating method, extrusion coating method, direct gravure coating method, reverse gravure coating method, die coating method).
- a known method eg, wire bar coating method, extrusion coating method, direct gravure coating method, reverse gravure coating method, die coating method.
- the thickness of the optically anisotropic layer is preferably 0.1 to 20 111, more preferably 0.5 to 15 / ⁇ ⁇ , and most preferably 1 to LO m. preferable.
- the aligned liquid crystal molecules can be fixed while maintaining the alignment state.
- the immobilization is preferably performed by a polymerization reaction.
- the polymerization reaction includes a thermal polymerization reaction using a thermal polymerization initiator and a photopolymerization reaction using a photopolymerization initiator. Photopolymerization reaction is preferred ⁇ Examples of photopolymerization initiators include ⁇ -carbo-Rui compounds (described in US Pat. Nos. 2,367,661 and 2,367,670), acyloin ether (US patent) No. 2,448,828), a-hydrocarbon-substituted aromatic acyloin compound (described in U.S. Pat. No.
- the amount of the photopolymerization initiator used is preferably in the range of 0.01 to 20% by mass of the solid content of the coating solution, and more preferably in the range of 0.5 to 5% by mass.
- Light irradiation for polymerization of liquid crystalline molecules is preferably performed using ultraviolet rays.
- the irradiation energy is, 20mi / cm 2 ⁇ 50j / cm is preferably in the 2 range instrument 20 m] / cm 2 to be in the range of ⁇ 5000NijZcm 2 is a more desirability instrument 100mjZcm 2 ⁇ 800nijZcm 2 range Is more preferable.
- light irradiation may be performed under heating conditions.
- a protective layer may be provided on the optically anisotropic layer. [0116] It is also preferable to combine this optical compensation film and a polarizing layer.
- the optically anisotropic layer is formed by coating the coating liquid for the optically anisotropic layer as described above on the surface of the polarizing film.
- the stress strain X cross-sectional area X elastic modulus
- the polarizing plate according to the present invention is attached to a large liquid crystal display device, an image with high display quality can be displayed without causing problems such as light leakage.
- the inclination angle between the polarizing layer and the optical compensation layer is stretched so as to match the angle formed between the transmission axis of the two polarizing plates bonded to both sides of the liquid crystal cell constituting the LCD and the vertical or horizontal direction of the liquid crystal cell. It is preferable.
- the normal inclination angle is 45 °. Recently, however, devices that are not necessarily 45 ° have been developed for transmissive, reflective, and transflective LCDs, and it is preferable that the stretching direction can be arbitrarily adjusted according to the design of the LCD.
- an antireflection film is transparent between a low refractive index layer which is also an antifouling layer and at least one layer having a higher refractive index than that of the low refractive index layer (ie, a high refractive index layer and a medium refractive index layer). It is provided on a substrate (cellulose acylate film of the present invention).
- the antireflection film which consists of the antireflection film which provided the anti-glare property in which the surface of the uppermost layer has the shape of a fine unevenness to the antireflection film by application
- the cellulose acylate film of the present invention is particularly preferred for its ability to be applied to any of the above-mentioned methods.
- At least a medium refractive index layer on a substrate (cellulose acylate film in the present invention)
- the antireflective film having the layer constitutional power in the order of high refractive index layer and low refractive index layer (outermost layer) is designed to have a refractive index satisfying the following relationship.
- a hard coat layer may be provided between the transparent support and the medium refractive index layer.
- it may be composed of a medium refractive index hard coat layer, a high refractive index layer and a low refractive index layer.
- JP-A-8-122504, JP-A-8-110401, JP-A-10-300902, JP-A-2002-243906, JP-A-2000-111706 and the like can be mentioned.
- other functions may be given to each layer, for example, an antifouling low refractive index layer or an antistatic high refractive index layer (eg, JP-A-10-206603, JP-A-2002). -24390 6 gazette).
- the haze of the antireflection film is preferably 5% or less, more preferably 3% or less.
- the strength of the film is most preferably 2H or more, more preferably 3H or more, more preferably H or more in the pencil hardness test according to JIS K5400.
- the layer having a high refractive index of the antireflection film is composed of a curable film containing at least ultrafine inorganic compound particles having a high refractive index with an average particle size of lOOnm or less and a matrix noinder.
- Examples of the high refractive index inorganic compound fine particles include inorganic compounds having a refractive index of 1.65 or more, preferably those having a refractive index of 1.9 or more.
- examples thereof include oxides such as Ti, Zn, Sb, Sn, Zr, Ce, Ta, La, and In, and composite oxides containing these metal atoms.
- the surface of the particles is treated with a surface treatment agent (for example, silane coupling agents, etc .: JP-A-11-295503, JP-A-11-153703, 2000-9908, ionic compounds or organometallic coupling agents: JP 2001-310432 A, etc.), core-shell structure with high refractive index particles as a core (JP 2001-166104, etc.) And specific dispersants (for example, JP-A-11-153703, Patent No. US6210858B1, column 2002-2776069, etc.) and the like.
- a surface treatment agent for example, silane coupling agents, etc .: JP-A-11-295503, JP-A-11-153703, 2000-9908, ionic compounds or organometallic coupling agents: JP 2001-310432 A, etc.
- specific dispersants for example, JP-A-11-153703, Patent No. US6210858B1, column 2002-2776069, etc.
- the material forming the matrix include conventionally known thermoplastic resin, cur
- At least two radically polymerizable and / or cationically polymerizable groups are present.
- At least one composition selected from the above-described polyfunctional compound-containing composition, an organometallic compound containing a hydrolyzable group, and a partial condensate composition thereof is preferred.
- examples thereof include compounds described in JP-A Nos. 2000-47004, 2001-315242, 2001-31871, 2001-296401, and the like.
- a curable film obtained from a colloidal metal oxide obtained from a hydrolyzed condensate of metal alkoxide and a metal alkoxide composition is also preferred. For example, it is described in JP 2001-293818 A.
- the refractive index of the high refractive index layer is generally 1.70-2.20.
- the thickness of the high refractive index layer is preferably 5 nm to 10 ⁇ m, more preferably 10 nm to 1 ⁇ m.
- the refractive index of the middle refractive index layer is adjusted to be a value between the refractive index of the low refractive index layer and the refractive index of the high refractive index layer.
- the medium refractive index layer is the same layer as the high refractive index layer except for the refractive index, and the refractive index of the medium refractive index layer is preferably 1.50-1.70.
- the low refractive index layer is formed by sequentially laminating on the high refractive index layer.
- the refractive index of the low refractive index layer is from 1.20 to L55. Preferably 1.30 ⁇ : L50.
- the outermost layer having scratch resistance and antifouling property.
- As a means for greatly improving the scratch resistance it is effective to impart slipperiness to the surface, and it is possible to apply a conventionally known silicone compound containing silicone and a thin film layer consisting of fluorine-containing compounds containing fluorine. .
- the refractive index of the fluorine-containing compound is preferably 1.35 to L50, more preferably 1.36-1.47.
- the fluorine-containing compound is preferably a compound containing a crosslinkable or polymerizable functional group containing a fluorine atom in a range of 35 to 80% by mass.
- fluorine-containing compound examples include paragraph numbers [0018] to [0026] of JP-A-9 222503, paragraph numbers [0019] to [0030] of JP-A-11-38202, Examples include compounds described in JP-A-2001-40284, paragraph numbers [0027] to [0028], JP-A-2000-284102, and the like.
- the silicone compound is a compound having a polysiloxane structure, and has a curable functional group in the polymer chain.
- ⁇ contains a polymerizable functional group and has a crosslinked structure in the film.
- reactive silicones eg, Silaplane (manufactured by Chisso Corporation), silanol group-containing polysiloxanes at both ends (JP-A-11-258403, etc.) and the like can be mentioned.
- the coating composition for forming the outermost layer containing a polymerization initiator, a sensitizer, etc. is applied at the same time or applied. It is preferable to carry out by light irradiation or heating later.
- a sol-gel cured film is also preferred in which an organometallic compound such as a silane coupling agent and a specific fluorine-containing hydrocarbon group-containing silane coupling agent are cured by a condensation reaction in the presence of a catalyst.
- an organometallic compound such as a silane coupling agent and a specific fluorine-containing hydrocarbon group-containing silane coupling agent are cured by a condensation reaction in the presence of a catalyst.
- polyfluoroalkyl group-containing silane compounds or partially hydrolyzed condensates thereof JP-A 58-142958, JP-A 58-147483, JP-A 58-147484, JP-A 9-157582
- silyl compounds containing a poly “perfluoroalkyl ether” group which is a fluorine-containing long chain group JP 2000-117902 A, 2001- 48590, 2002-53804, etc.
- the low refractive index layer has an average primary particle diameter of fillers (for example, silicon dioxide (silica), fluorine-containing particles (magnesium fluoride, calcium fluoride, barium fluoride)) as additives other than those described above.
- fillers for example, silicon dioxide (silica), fluorine-containing particles (magnesium fluoride, calcium fluoride, barium fluoride)
- silane coupling agent for example, silane coupling agent, slip agent, surfactant, etc.
- the low refractive index layer When the low refractive index layer is located below the outermost layer, the low refractive index layer may be formed by a vapor phase method (vacuum deposition method, sputtering method, ion plating method, plasma CVD method, etc.).
- the coating method is preferable because it can be manufactured at a low cost.
- the film thickness of the low refractive index layer is preferably 30 to 200 nm, preferably 50 to 150 nm. Force S More preferably 60 to 120 nm.
- the hard coat layer is provided on the surface of the stretched / unstretched cellulose silicate film to impart physical strength to the antireflection film.
- it is preferably provided between the stretched / unstretched cellulose acylate film and the high refractive index layer. It is also preferable to coat directly on an unstretched cellulose acylate film without providing an antireflection layer.
- the hard coat layer is preferably formed by a crosslinking reaction or a polymerization reaction of a curable compound of light and Z or heat.
- the curable functional group is preferably a photopolymerizable functional group, and the hydrolyzable functional group-containing organometallic compound is preferably an organic alkoxysilyl compound.
- constituent composition of the hard coat layer include those described in JP-A Nos. 2002-144913, 2000-9908, and International Publication WO0Z46617.
- the high refractive index layer can also serve as a hard coat layer. In such a case, it is preferable that fine particles are dispersed finely and contained in the hard coat layer using the method described in the high refractive index layer.
- the hard coat layer can also serve as an antiglare layer (described later) provided with particles having an average particle size of 0.2 to: LO / zm and imparted with an antiglare function (antiglare function).
- the film thickness of the hard coat layer can be appropriately designed depending on the application.
- the film thickness of the hard coat layer is preferably 0.2 to: LO / zm, more preferably 0.5 to 7 / ⁇ ⁇ .
- the strength of the hard coat layer is preferably 2 mm or more, more preferably 3 mm or more, most preferably 3 mm or more in the pencil hardness test according to JIS 5400. In addition, in the Taber test according to JIS ⁇ 5400, it is preferable that the wear amount of the test piece before and after the test is smaller.
- the forward scattering layer is provided in order to give a viewing angle improvement effect when the viewing angle is tilted vertically and horizontally when applied to a liquid crystal display device. By dispersing fine particles having different refractive indexes in the hard coat layer, it can also serve as a hard coat function.
- Japanese Patent Application Laid-Open No. 11-38208 specifying a forward scattering coefficient
- Japanese Patent Application Laid-Open No. 11-38208 specifying a haze value of 40% or more.
- the 2002-107512 gazette etc. are mentioned.
- a primer layer an antistatic layer, an undercoat layer or a protective layer may be provided.
- Each layer of the antireflection film is formed by a dip coating method, an air knife coating method, a curtain coating method, a roller coating method, a wire bar coating method, a gravure coating, a micro gravure method or an etatrusion coating method (US Pat.No. 2,681,294). According to the description, it can be formed by coating.
- the antireflection film may have an antiglare function that scatters external light.
- the antiglare function is obtained by forming irregularities on the surface of the antireflection film.
- the haze of the antireflection film is preferably 3 to 30%, more preferably 5 to 20%, and most preferably 7 to 20%. .
- any method can be applied as long as the surface shape can be sufficiently maintained.
- a method of forming irregularities on the film surface using fine particles in the low refractive index layer for example, JP-A-2000-271878, a lower refractive index layer (high refractive index layer, medium refractive index).
- Surface uneven film is formed by adding a small amount (0.1 to 50% by mass) of relatively large particles (particle size 0.05-2 / ⁇ ⁇ ) to the layer or hard coat layer).
- the method of providing a low refractive index layer while maintaining the shape for example, JP-A-200-281410, 2000-95893, 2001-100004, 2001-281407, etc.
- a method of physically transferring the uneven shape onto the surface after the upper layer (antifouling layer) is applied for example, as an embossing method, JP-A-63-278839, (Kaihei 11-183710, JP-A 2000-275401, etc.).
- the liquid crystal display device of the present invention is formed using the above-described polarizing plate, optical compensation film, and antireflection film. Each liquid crystal mode in which these films are used will be explained.
- TN mode liquid crystal display devices are most frequently used as color TFT liquid crystal display devices and are described in many documents.
- the alignment state in the liquid crystal cell is such that the rod-like liquid crystal molecules rise at the center of the cell and the rod-like liquid crystal molecules lie in the vicinity of the cell substrate.
- the OCB mode liquid crystal display device is a bend alignment mode liquid crystal cell in which rod-like liquid crystalline molecules are aligned in a substantially opposite direction (symmetrically) between the upper and lower portions of the liquid crystal cell.
- a liquid crystal display device using a bend alignment mode liquid crystal cell is disclosed in US Pat. Nos. 4,583,825 and 5,410,422. Since the rod-like liquid crystal molecules are aligned symmetrically between the upper part and the lower part of the liquid crystal cell, the bend alignment mode liquid crystal cell has a self-optical compensation function. Therefore, this liquid crystal mode is also called OCB (Optically Compensated Bend) liquid crystal mode.
- the OCB mode liquid crystal cell is in the black display, and the alignment state in the liquid crystal cell is such that the rod-like liquid crystalline molecules rise at the center of the cell and the rod-like liquid crystalline molecules lie near the cell substrate. is there.
- the VA mode liquid crystal display device is characterized in that the rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied.
- the rod-like liquid crystalline molecules are not applied with voltage.
- VA mode liquid crystal cell described in JP-A-2-176625
- VA mode multi-domain (MVA mode) liquid crystal cell SID97, described in Digest of tech.
- the IPS mode liquid crystal display device is characterized by the fact that rod-like liquid crystalline molecules are aligned substantially in-plane horizontally when no voltage is applied, and switching is achieved by changing the alignment direction of the liquid crystal with or without voltage application. It is a feature.
- Those described in Japanese Patent No. 195333 can be used.
- the ASM (Axially Symmetric Aligned Microcell) mode can also be optically compensated in the same way as described above. In addition, it is effective for any of transmissive, reflective, and transflective liquid crystal display devices. It is also advantageously used as an optical compensation sheet for GH (Guest-Host) type reflective liquid crystal display devices.
- GH Guest-Host
- the cellulose acylate film of the present invention is an optical film, particularly for a protective film for a polarizing plate, an optical compensation sheet for a liquid crystal display device (also referred to as a retardation film), an optical compensation sheet for a reflective liquid crystal display device, and silver halide. It is useful as a support for photographic light-sensitive materials.
- a capillary type viscometer for example, Cabilite Rheometer CFT-500D manufactured by Shimadzu Corporation
- the measurement is performed under the following conditions.
- the synthetic cellulose acylate solution thus obtained was added to 21 parts by mass of a carboxylic acid aqueous solution (acetic acid, propionic acid, butyric acid and lactic acid prepared according to the ratio of the acyl group of cellulose acylate shown in Table 1. At least one selected from herbic acid) was added, the temperature was raised to 47 ° C. and held for 90 minutes to ripen the cellulose acetate. By changing the ratio of carboxylic acid to water, the 6-position acylation rate shown in Table 1 was adjusted. The mixing ratio was 1680 parts by mass of the carboxylic acid aqueous solution (acyl group donor) and 22.6 parts by mass of sulfuric acid (catalyst) with respect to 499 parts by mass of cellulose succinate.
- a carboxylic acid aqueous solution acetic acid, propionic acid, butyric acid and lactic acid prepared according to the ratio of the acyl group of cellulose acylate shown in Table 1. At least one selected from herbic acid
- the mixing ratio
- the obtained solution was aged at 40 ° C. for cellulose acylate.
- Samples having different degrees of polymerization (measured by the following method) shown in Table 1 were prepared by changing this aging time (the degree of polymerization decreases as the aging time is increased).
- the sulfuric acid catalyst was deactivated by neutralization using a 24 mass% magnesium acetate aqueous solution. Thereafter, it was poured into a mixed solution of water and acetic acid (70:30 mass ratio) with stirring and solidified. This was washed in 70 ° C warm water with stirring. Samples with different residual sulfuric acid amounts were prepared by changing the washing time. The resulting precipitate was separated by filtration, washed with running water, centrifuged and drained, and dried at 50 ° C. to obtain cellulose acylate.
- Plasticizer A Polyethylene glycol (molecular weight 600)
- Plasticizer B Glycerin diacetate
- Plasticizer C Example of JP 6-501040 A Compound (Di-TPP) In addition, acetic acid, propionic acid and butyric acid are selected from the values shown in Table 1. I added it to.
- silicon dioxide particles (Aerosil R972V) 0.05% by mass
- UV absorber (2, -hydroxy-3, 5-di-tert-butylphenol) -benzotriazole: 0 . 05 mass 0/0, 2, 4-hydroxy one 4-methoxy one benzophenone: 0. 1%) was added.
- the screw rotation speed is 300 rpm
- the kneading time is 40 seconds
- the extrusion force is 200 kgZhr
- the die force is also extruded, solidified in water at 60 ° C, and then cut to 2 mm in diameter and 3 mm in length. Columnar pellets were obtained.
- melt viscosity of the cellulose acylate thus obtained was determined as a function of shear rate, melt viscosity as a function of temperature, Re, Rth, residual sulfuric acid content, Na content, and Tg (measured by the following method). And listed in Table 2.
- this film was cut by 1000 m with a rotary blade and observed with an actual microscope at 100 points every 10 m, and the frequency of occurrence of chipping and cracking was counted in% and shown in Table 1.
- the digit part is missing and cracked, which becomes cutting waste).
- the cutting was performed at low humidity (25 ° C ⁇ 10% relative humidity), which is a severe condition.
- the cellulose acylate film thus obtained was stretched at Tg + 15 ° C. at the magnifications shown in Table 1. After this, 5% of each end was trimmed. These Re, Rth, and cutting waste were measured by the above method and listed in Table 2. What carried out this invention showed the favorable cutting property after extending
- the unstretched and stretched cellulose acylate films were acidified by the following immersion acid method. In addition, the same results were obtained when the following coating method was performed.
- a 2.5 mol ZL aqueous solution of NaOH was used as an incubation solution. The temperature was adjusted to 60 ° C., and the cell mouth one succinate film was immersed for 2 minutes. Thereafter, it was immersed in a 0.05 mol ZL sulfuric acid aqueous solution for 30 seconds and then passed through a water washing bath.
- the polarizing film thus obtained and the oxidized unstretched and stretched cellulose acylate film were combined with a PVA (manufactured by Kuraray Co., Ltd., PVA-117H) 3% aqueous solution as an adhesive, and the polarizing axis and the cellulose
- the longitudinal force with the acylate film was laminated in the following combination so as to be parallel (selected configurations are listed in Table 2).
- Polarizing plate A Unstretched cell mouth succinate film Z polarizing film ZTD80U
- Polarizing plate B Unstretched cellulose acylate film Z Polarizing film Z Unstretched cellulose acylate film
- Polarizing plate C Stretched cellulose acylate film Z Polarizing film ZTD80U
- Polarizing plate D stretched cellulose acylate film Z polarizing film Z unstretched cellulose acylate film
- Polarizing plate E Stretched cellulose acylate film Z Polarizing film Z-stretched cellulose acylate Finolem
- the “TD80U” is a triacetyl cellulose film manufactured by Fuji Photo Film Co., Ltd., which has been subjected to the above coating process.
- a laminate was prepared by laminating the polarizing axis and the cellulose acylate film so that the longitudinal force was orthogonal and 45 °, and the same evaluation was performed. In either case, the results were the same as those obtained when the films were bonded in parallel.
- a liquid crystal display device was prepared by arranging the transmission axis of the polarizing plate on the observer side and the transmission axis of the polarizing plate on the backlight side to be orthogonal to each other.
- the polarizing plate and the retardation polarizing plate of the present invention can be used as a liquid crystal display device described in Example 1 of JP-A-10-48420 and a disco described in Example 1 of JP-A-9-26572.
- a good liquid crystal display element was obtained. .
- a low-reflection film was produced from the cellulose acylate film of the present invention in accordance with Example 47 of the Invention Association Open Technique (Publication No. 2001-1745, published on March 15, 2001, Invention Association). This was punched out with a Thomson blade like the above-mentioned polarizing plate, and the cutting property was evaluated. When the present invention was implemented, the same good results as in the case of the polarizing plate were obtained.
- the low reflection film of the present invention is obtained by using a liquid crystal display device described in Example 1 of JP-A-10-48420 and a 20-inch VA liquid crystal display device described in FIGS. 2 to 9 of JP-A-2000-154261.
- 20-inch OCB type liquid crystal display device described in FIGS. 10 to 15 of JP 2000-154261 A, and IPS type liquid crystal display device shown in FIG. 11 of JP 2004-12731 A When an evaluation was made on the outermost layer, a good liquid crystal display element was obtained.
- cellulose acylates having the substitution degree and polymerization degree shown in Table 3 were prepared. This was prepared in the same manner as in Example 1 so that the residual sulfuric acid amount, carboxylic acid amount, and Na content in Table 3 were obtained. However, the plasticizer and the optical adjusting agent were not added to any of the examples. The melt properties of the cellulose acylate thus obtained are shown in Table 3.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2007517864A JPWO2006126592A1 (ja) | 2005-05-24 | 2006-05-24 | セルロースアシレートフィルム、並びに、これを用いた偏光板、光学補償フィルムおよび液晶表示装置 |
CN2006800179848A CN101180351B (zh) | 2005-05-24 | 2006-05-24 | 酰化纤维素薄膜、以及使用它的偏振片、光学补偿薄膜和液晶显示装置 |
EP06746796A EP1911792A4 (en) | 2005-05-24 | 2006-05-24 | CELLULOSE ACRYLATE FILM, AND POLARIZING PLATE, OPTICAL COMPENSATING FILM, AND LIQUID CRYSTAL DISPLAY USING THE SAME |
KR1020077027632A KR101247928B1 (ko) | 2005-05-24 | 2006-05-24 | 셀룰로오스 아실레이트 필름, 그리고, 이것을 사용한편광판, 광학 보상 필름 및 액정 표시 장치 |
US11/912,419 US7914712B2 (en) | 2005-05-24 | 2006-05-24 | Cellulose acylate film, polarizing plate, optical compensation film, and liquid crystal display device using the same |
Applications Claiming Priority (4)
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JP2005-150333 | 2005-05-24 | ||
JP2005150333 | 2005-05-24 | ||
JP2006-030694 | 2006-02-08 | ||
JP2006030694 | 2006-02-08 |
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PCT/JP2006/310364 WO2006126592A1 (ja) | 2005-05-24 | 2006-05-24 | セルロースアシレートフィルム、並びに、これを用いた偏光板、光学補償フィルムおよび液晶表示装置 |
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US (1) | US7914712B2 (ja) |
EP (1) | EP1911792A4 (ja) |
JP (1) | JPWO2006126592A1 (ja) |
KR (1) | KR101247928B1 (ja) |
CN (1) | CN101180351B (ja) |
WO (1) | WO2006126592A1 (ja) |
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JP2014052647A (ja) * | 2010-09-03 | 2014-03-20 | Nitto Denko Corp | 薄型偏光膜の製造方法 |
JP2013213871A (ja) * | 2012-03-30 | 2013-10-17 | Dainippon Printing Co Ltd | 位相差フィルム及び位相差フィルムの製造方法 |
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EP1911792A4 (en) | 2009-09-23 |
KR20080012318A (ko) | 2008-02-11 |
JPWO2006126592A1 (ja) | 2008-12-25 |
KR101247928B1 (ko) | 2013-03-26 |
US7914712B2 (en) | 2011-03-29 |
CN101180351A (zh) | 2008-05-14 |
EP1911792A1 (en) | 2008-04-16 |
CN101180351B (zh) | 2011-11-30 |
US20090023911A1 (en) | 2009-01-22 |
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