WO2010087219A1 - セルロース系樹脂組成物およびセルロース系樹脂フィルム - Google Patents
セルロース系樹脂組成物およびセルロース系樹脂フィルム Download PDFInfo
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- WO2010087219A1 WO2010087219A1 PCT/JP2010/050141 JP2010050141W WO2010087219A1 WO 2010087219 A1 WO2010087219 A1 WO 2010087219A1 JP 2010050141 W JP2010050141 W JP 2010050141W WO 2010087219 A1 WO2010087219 A1 WO 2010087219A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/20—Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
- C08L1/14—Mixed esters, e.g. cellulose acetate-butyrate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
- C09D101/08—Cellulose derivatives
- C09D101/10—Esters of organic acids
- C09D101/12—Cellulose acetate
-
- 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 cellulosic resin composition and a cellulosic resin film, and more particularly to a cellulosic resin composition suitable for use in a polarizing plate, a protective film for a polarizing plate, and a cellulosic resin film obtained from the resin.
- Cellulosic resins are generally tougher than other synthetic resins, have excellent characteristics such as transparency, gloss and gloss, and a smooth surface and good feel. For this reason, the use of this resin has a wide variety, for example, a sheet, a film, a wire coating, a toy, a medical device or a food packaging material.
- the cellulosic resin does not have thermoplasticity, and must be melted or dissolved in a solvent at a high temperature during processing and molding. However, when it is melted at a high temperature, there is a problem of causing thermal decomposition and coloring at the same time. Therefore, in order to avoid this, it is necessary to blend a suitable plasticizer to lower the softening point of the cellulosic resin.
- triphenyl phosphate for this purpose, for example, triphenyl phosphate, tricresyl phosphate, diphenyl phosphate, triethyl Phosphate, tributyl phosphate, dimethyl phthalate, diethyl phthalate, dimethoxyethyl phthalate, ethyl phthalyl ethyl glycolate, butyl phthalyl butyl glycolate, toluenesulfonamide, triacetin or pentaerythritol tetraacetate have been used.
- plasticizers can satisfy a wide range of performances such as compatibility with cellulosic resins, plasticization efficiency, non-volatility, stability to heat and light, non-migration, non-extractability, and water resistance. There is nothing, and the current situation is that it hinders further expansion of the use of the resin composition.
- Patent Document 1 proposes a plasticizer having a hydrocarbon ring
- Patent Document 2 proposes an ester compound of a polyhydric alcohol having different alkyl groups and aryl groups.
- a cellulose triacetate film is generally widely used as a protective film for polarizing plates, and a plasticizer is added to the cellulose triacetate film for the purpose of improving the flexibility of the film and reducing moisture permeability. It had been.
- the retention property deterioration refers to a property that the mass of the film is reduced due to precipitation or volatilization of an additive such as a plasticizer outside the film in a high temperature and high humidity environment.
- the retentivity is poor and the function of the liquid crystal image display device is lowered.
- Patent Document 3 proposes to use a citrate ester and Patent Document 4 proposes to use pentaerythritol.
- Patent Document 5 proposes the use of glycerides, and Patent Document 6 proposes the use of diglycerin esters.
- the cellulose resin compositions described in Patent Documents 1 and 2 have a problem that the plasticizer bleeds on the resin surface, and none of them is satisfactory.
- the cellulose resin compositions described in Patent Documents 3 to 6 have the effect of improving transparency and retention, regarding the bleeding of the plasticizer to the resin surface when a large amount of plasticizer is added, Therefore, more sufficient improvement has been desired.
- an object of the present invention is to provide a cellulose resin composition capable of providing a cellulose ester film excellent in moisture permeability without causing bleeding problems even when a relatively large amount of plasticizer is blended, and the cellulose resin composition. It is providing the cellulose resin film obtained from a thing.
- the present inventors have added the above-mentioned object by adding a polyester plasticizer obtained from a specific polybasic acid component, a glycol component and a stopper to the cellulose resin.
- the present invention has been completed.
- the cellulose resin composition of the present invention is a cellulose resin composition obtained by adding (A) a polyester plasticizer to a cellulose resin, and (A) the polyester plasticizer is polybasic. 30 to 70 mol of at least one selected from the group consisting of 70 to 30 mol% of succinic acid and / or adipic acid, terephthalic acid, phthalic acid and isophthalic acid, obtained from an acid, glycol and stopper.
- the glycol is at least one selected from the group consisting of ethylene glycol, 1,2-propylene glycol, 1,3-butanediol, 2-methyl-1,3-propanediol, and the stopper is acetic acid And / or benzoic acid having a weight average molecular weight of 600 to 2,000.
- the cellulose resin composition of the present invention 3 to 50 parts by mass of the (A) polyester plasticizer is preferably added to 100 parts by mass of the cellulose resin, and the cellulose resin is cellulose triacetate. More preferably it is.
- the cellulose resin film of the present invention is obtained from the cellulose resin composition.
- the cellulose resin composition of the present invention can take advantage of the excellent properties of a plasticizer without bleeding even when a relatively large amount of the plasticizer is blended.
- a polarizing plate, a protective film for a polarizing plate, a retardation plate It is suitably used as a liquid crystal display member such as a reflector, a viewing angle improving film, an antiglare film, a nonreflective film, and an antistatic film.
- the cellulose resin composition of the present invention will be described in detail.
- the lower fatty acid in the lower fatty acid ester of cellulose means a fatty acid having 6 or less carbon atoms.
- Examples of the lower fatty acid ester of cellulose include cellulose acetate, cellulose propionate, and cellulose butyrate.
- Examples include mixed fatty acid esters such as cellulose acetate propionate and cellulose acetate butyrate as described in Japanese Patent No. -45804, Japanese Patent Application Laid-Open No. Hei 8-231761, and US Pat. No. 2,319,052. Can do.
- the lower fatty acid ester of cellulose that is particularly preferably used is cellulose triacetate.
- the cellulose triacetate when cellulose triacetate is used as the cellulose resin, from the viewpoint of film strength, the cellulose triacetate preferably has a polymerization degree of 250 to 400 and an average degree of acetylation (bound acetic acid amount) of 54.0 to 62.5%. More preferred is an acetylation degree of 58.0 to 62.5%.
- a particularly preferred lower fatty acid ester of cellulose has an acyl group having 2 to 4 carbon atoms as a substituent, the substitution degree of acetyl group is X, and the substitution degree of propionyl group or butyryl group is Y, (I), 2.6 ⁇ X + Y ⁇ 3.0 (I) And the following formula (II), 0 ⁇ X ⁇ 2.5 (II) Is a cellulose ester that simultaneously satisfies
- the lower fatty acid ester of cellulose is preferably cellulose acetate propionate, and more preferably 1.9 ⁇ X ⁇ 2.5, and more preferably 0.1 ⁇ Y ⁇ 0.9.
- the portion not substituted with an acyl group usually exists as a hydroxyl group.
- cellulose esters synthesized using cotton linter, wood pulp, kenaf and the like as raw materials can be used alone or in combination.
- a cellulose ester synthesized from cotton linter hereinafter sometimes simply referred to as linter
- linter a cellulose ester synthesized from cotton linter
- the polybasic acid that can provide the polyester plasticizer as component (A) according to the present invention is 70 to 30 mol%, preferably 60 to 40 mol, of succinic acid and / or adipic acid in the polybasic acid. And at least one selected from the group consisting of terephthalic acid, phthalic acid and isophthalic acid is 30 to 70 mol%, preferably 40 to 60 mol%. When the former exceeds 70 mol%, the moisture permeability is poor, and when the latter exceeds 70 mol%, the compatibility is lowered.
- Glycols that can provide the polyester plasticizer as component (A) according to the present invention are ethylene glycol, 1,2-propylene glycol, 1,3-butanediol, 2-methyl-1,3-propanediol. Is at least one selected from the group consisting of When long-chain glycol is used, moisture permeability and compatibility are lowered.
- the stopper capable of providing the polyester plasticizer as the component (A) according to the present invention is acetic acid and / or benzoic acid. Those that do not use a stopper are inferior in moisture permeability, and when a long chain stopper is used, the compatibility is lowered.
- the weight average molecular weight of the polyester-based plasticizer as the component (A) according to the present invention is 600 to 2000, preferably 600 to 1500, and if it exceeds this range, the compatibility is lowered.
- the (A) polyester plasticizer can be produced by a known method. For example, in the presence of a catalyst such as dibutyltin oxide or tetraalkyl titanate, the polybasic acid, the glycol and the stopper are used. Can be used.
- the ratio of each of the above components used in the production varies depending on the type of the component used, the characteristics of the target polyester plasticizer, the molecular weight, and the like, but generally 10 to 80% by mass of a polybasic acid and glycol 10 Used in a ratio of ⁇ 80 mass%.
- polyester plasticizer used in the present invention are specifically exemplified in Table 1 below.
- Table 1 AV is the acid value
- OHV is the hydroxyl value
- Mw is the molecular weight
- () in the mixture is the molar ratio.
- SA Succinic acid
- AA Adipic acid
- PA Phthalic acid
- IPA Isophthalic acid
- TPA Terephthalic acid
- EG Ethylene glycol
- the acid value of the polyester plasticizer is preferably 1 or less.
- the amount of the polyester plasticizer added is 3 to 50 parts by mass, preferably 5 to 30 parts by mass with respect to 100 parts by mass of the cellulose resin. If the amount added is less than 3 parts by mass, the effect of imparting flexibility may not be obtained, and if it exceeds 50 parts by mass, bleeding may occur, which is not preferable.
- the resin composition of the present invention may further contain various additives such as phosphorus-based, phenol-based or sulfur-based antioxidants, ultraviolet absorbers, hindered amine light stabilizers, and the like.
- Examples of the phosphorus antioxidant include triphenyl phosphite, tris (2,4-ditert-butylphenyl) phosphite, tris (nonylphenyl) phosphite, tris (dinonylphenyl) phosphite, tris ( Mono-, di-mixed nonylphenyl) phosphite, bis (2-tert-butyl-4,6-dimethylphenyl) -ethyl phosphite, diphenyl acid phosphite, 2,2'-methylenebis (4,6-di-tert-butyl) Phenyl) octyl phosphite, diphenyl decyl phosphite, phenyl diisodecyl phosphite, tributyl phosphite, tris (2-ethylhexyl) phosphite, tri
- phenol-based antioxidant examples include 2,6-ditert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, stearyl (3,5-ditert-butyl-4- Hydroxyphenyl) propionate, distearyl (3,5-ditert-butyl-4-hydroxybenzyl) phosphonate, tridecyl 3,5-ditert-butyl-4-hydroxybenzylthioacetate, thiodiethylenebis [(3,5 -Di-tert-butyl-4-hydroxyphenyl) propionate], 4,4'-thiobis (6-tert-butyl-m-cresol), 2-octylthio-4,6-di (3,5-di-tert-butyl) -4-hydroxyphenoxy) -s-triazine, 2,2'-methylenebis (4-methyl-6-tert-butylphenol), bis [3,3 Bis (4-hydroxy-3-tert-but
- sulfur-based antioxidant examples include dialkylthiodipropionates such as dilauryl, dimyristyl, myristylstearyl and distearyl esters of thiodipropionic acid and polyols such as pentaerythritol tetra ( ⁇ -dodecyl mercaptopropionate). And ⁇ -alkyl mercaptopropionic acid esters.
- Examples of the ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-tert-butyl-4 ′-(2 -Methacryloyloxyethoxyethoxy) benzophenone, 2-hydroxybenzophenones such as 5,5'-methylenebis (2-hydroxy-4-methoxybenzophenone); 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, 2- (2-hydroxy-3,5-ditert-butylphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-3-tert-tert Butyl-5-methylphenyl) -5-chlorobenzotriazole 2- (2-hydroxy-3-dodecyl-5-methylphenyl) benzotriazole, 2- (2-hydroxy-3-tert-butyl-5-C7-9
- hindered amine light stabilizer examples include 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, 2,2, 6,6-tetramethyl-4-piperidylbenzoate, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate Bis (1-octoxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4 Butanetetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, bis (2, , 6,6-tetramethyl-4-piperidyl) -bis (tridecyl) -1
- the cellulose-based resin composition of the present invention further includes other additives as necessary, for example, fillers, colorants, crosslinking agents, antistatic agents, plate-out preventing agents, surface treatment agents, lubricants, flame retardants. , Fluorescent agents, antifungal agents, bactericides, metal deactivators, mold release agents, pigments, processing aids, antioxidants, light stabilizers, foaming agents, and the like.
- the cellulose-based resin composition of the present invention can be used for various purposes by various known processing methods, but is particularly preferably used as a film such as a polarizing plate or a polarizing plate protective film because of its characteristics.
- a method for producing a cellulose ester film comprising the cellulose resin composition of the present invention (hereinafter sometimes referred to as the cellulose ester film of the present invention) will be described.
- the production of the cellulose ester film of the present invention is performed by applying and drying a dope solution in which cellulose ester is dissolved in a solvent.
- Various additives can be mixed in the dope liquid as necessary.
- the concentration of the cellulose ester in the dope is preferably higher because the drying load after casting on the support can be reduced. However, if the concentration of the cellulose ester is too high, the load during filtration increases and the filtration accuracy is poor. Become.
- the concentration for achieving both of these is preferably 10 to 30% by mass, more preferably 15 to 25% by mass.
- the solvent used for the preparation of the dope solution in the production of the cellulose resin film of the present invention may be used alone or in combination, but it is preferable from the viewpoint of production efficiency that a good solvent and a poor solvent of cellulose ester are mixed and used.
- the preferable range of the mixing ratio of the poor solvent is 70 to 98% by mass for the good solvent and 30 to 2% by mass for the poor solvent.
- acetone becomes a good solvent for cellulose esters having an average degree of acetylation of 55%, and poor for cellulose esters having an average degree of acetylation of 60%. It becomes a solvent.
- the good solvent and the poor solvent are not uniquely determined in all cases, but as the good solvent used in the present invention in the case of cellulose triacetate, organic halogen compounds such as methylene chloride and dioxolane are used.
- the poor solvent examples include methanol, ethanol, n-butanol, cyclohexane and cyclohexanone.
- a general method can be used, but under pressure, a temperature in a range not lower than the boiling point of the solvent at normal pressure and not causing the solvent to boil.
- the method of heating with stirring and dissolving with stirring is preferred in order to prevent the generation of bulk undissolved material called gel or mako.
- a method in which cellulose ester is mixed with a poor solvent and wetted or swollen, and then mixed with a good solvent and dissolved is also preferably used.
- a known cooling dissolution method may be used. When the cooling dissolution method is used, methyl acetate or acetone can be used as a good solvent.
- the pressurization may be performed by a method of injecting an inert gas such as nitrogen gas or by increasing the vapor pressure of the solvent by heating. Heating is preferably performed from the outside. For example, a jacket type is preferable because temperature control is easy.
- the heating temperature after addition of the solvent is preferably in the range where the solvent does not boil at or above the normal pressure of the solvent used from the viewpoint of the solubility of the cellulose ester, but is required if the heating temperature is too high.
- the pressure increases and productivity is reduced.
- the range of the preferred heating temperature is 45 to 120 ° C, more preferably 60 to 110 ° C, and still more preferably 70 to 105 ° C.
- the pressure is adjusted so that the solvent does not boil at the set temperature.
- the cellulose ester solution is filtered using an appropriate filter medium such as filter paper.
- the filter medium it is preferable that the absolute filtration accuracy is small in order to remove unnecessary substances and the like, but if the absolute filtration accuracy is too small, there is a problem that the filter medium is likely to be clogged. Therefore, a filter medium having an absolute filtration accuracy of 0.008 mm or less is preferable, a filter medium in the range of 0.001 to 0.008 mm is more preferable, and a filter medium in the range of 0.003 to 0.006 mm is more preferable.
- the material of the filter medium is not particularly limited, and a normal filter medium can be used. However, a plastic filter medium such as polypropylene and Teflon (registered trademark) and a metal filter medium such as stainless steel are preferable because fibers do not fall off.
- the dope solution can be filtered by a normal method, but the method of filtering while heating at a temperature not lower than the boiling point of the solvent at a normal pressure and in a range where the solvent does not boil is a differential pressure before and after the filter medium. (Hereinafter, it may be called a filtration pressure.)
- the raise of a small is preferable.
- the filtration temperature is preferably 45 to 120 ° C, more preferably 45 to 70 ° C, and still more preferably 45 to 55 ° C. A smaller filtration pressure is preferred.
- the filtration pressure is preferably 1.6 ⁇ 10 6 Pa or less, more preferably 1.2 ⁇ 10 6 Pa or less, and further preferably 1.0 ⁇ 10 6 Pa or less.
- the support used in the casting process is preferably a support having a mirror-finished endless belt-like or drum-like stainless steel.
- the temperature of the support in the casting step is preferably from 0 ° C. to less than the boiling point of the solvent. The higher the temperature, the faster the drying speed. However, if the temperature is too high, foaming may occur or the flatness may deteriorate.
- the support temperature is preferably 0 to 50 ° C, more preferably 5 to 30 ° C.
- the method for controlling the temperature of the support is not particularly limited, and there are a method of blowing warm air or cold air, and a method of bringing a hot water bat into contact with the support.
- the amount of residual solvent upon peeling from the support is preferably 10 to 120%, more preferably 20 to 40% or 60 to 120%, particularly preferably. Is 20-30% or 70-115%.
- the heat treatment for measuring the residual solvent amount means heating the film at 115 ° C. for 1 hour.
- the film peeled off from the support is further dried, and the residual solvent amount is preferably 3% by mass or less, more preferably 0.5% by mass or less.
- a roll suspension system or a tenter system is used for drying while transporting the film.
- the width is maintained or stretched by a tenter method while the amount of residual solvent immediately after peeling from the support is large because the effect of improving the dimensional stability is more exhibited.
- the means for drying the film is not particularly limited, and is performed with hot air, infrared rays, a heating roll, a microwave, or the like. It is preferable to carry out with hot air in terms of simplicity.
- the drying temperature is preferably increased stepwise in the range of 40 to 150 ° C, and more preferably 50 to 140 ° C in order to improve dimensional stability.
- the film thickness of the cellulose ester film is preferably smaller because the resulting polarizing plate becomes thinner and the liquid crystal display can be made thinner, but if it is too thin, the moisture permeability increases and the tear strength and the like are insufficient.
- the film thickness of the cellulose ester film that achieves both of these is preferably 10 to 65 ⁇ m, more preferably 20 to 60 ⁇ m, and even more preferably 35 to 50 ⁇ m.
- the cellulose ester film of the present invention can be preferably used as a liquid crystal display member because of its low moisture permeability and high dimensional stability.
- a liquid crystal display member is a member used in a liquid crystal display device.
- a polarizing plate, a protective film for a polarizing plate, a retardation plate, a reflective plate, a viewing angle improving film, an antiglare film, an antireflective film, and a charge Prevention films and the like are examples.
- the cellulose ester film of the present invention is preferably used for a polarizing plate and a protective film for a polarizing plate.
- the polarizing plate can be prepared by a general method. For example, there is a method in which the cellulose ester film of the present invention is bonded to both surfaces of a polarizing film prepared by immersing and stretching in an iodine solution using an alkali saponification type polyvinyl alcohol aqueous solution.
- the alkali saponification treatment refers to a treatment in which the cellulose ester film is immersed in a high-temperature strong alkaline solution in order to improve the wetness of the water-based adhesive and improve the adhesion.
- the retardation Ro (nm) in the in-plane direction of the cellulose ester film is preferably as small as possible, preferably 100 nm or less, more preferably 10 nm or less, and still more preferably 5 nm or less.
- Ro (nm) is preferably 50 to 1000 nm.
- the cellulose ester film is measured for a three-dimensional refractive index at a wavelength of 590 nm using an automatic birefringence meter, and the slow axis angle ⁇ 1 and the refractive indexes Nx and Ny are obtained.
- Nx represents the refractive index of the film in a direction parallel to the film forming direction
- Ny represents the refractive index of the film in the direction perpendicular to the film forming direction
- d represents the thickness (nm) of the film.
- the angle ⁇ 0 formed between the film forming direction (corresponding to the longitudinal direction) of the film and the slow axis of the film is close to 0 °, + 90 °, or ⁇ 90 °.
- the slow axis is the direction in which the in-plane refractive index is the highest.
- ⁇ 1 (radian) ( ⁇ 1 is obtained by converting ⁇ 0 into radians) and retardation Ro in the in-plane direction have the following relationship.
- ⁇ represents the wavelength (nm) of light in the three-dimensional refractive index measurement for determining Ro and ⁇ 1 and is in the range of 380 to 650 nm.
- the above formula is preferably satisfied when ⁇ is 590 nm, and more preferably the above formula is satisfied when ⁇ is 400 nm.
- Acetylcellulose (acetylation degree 61.5%, polymerization degree 260) was dissolved in a mixed solvent consisting of 90 parts by mass of methylene chloride and 10 parts by mass of methyl alcohol with stirring to obtain a solution having a concentration of 15%. No. 2 shown in Table 2 below. 1-No. Each of 13 plasticizers was mixed with 10% by mass with respect to acetylcellulose, and the solution was cast on a metal support to form a film having a thickness of about 0.1 mm to produce a film.
- Moisture permeability in order to glue or polarizer prevented from being deteriorated by moisture is preferably 300 g / m 2 or less, 200 g / m 2 or less, and still more preferably 150 g / m 2 or less.
- SA succinic acid
- AA adipic acid
- PA phthalic acid
- IPA isophthalic acid
- TPA terephthalic acid
- EG ethylene glycol PG: 1,2-propylene glycol 13BG: 1,3-butanediol 2MPG: 2-methyl-1,3- Propanediol
- 14BG 1,4-butanediol 2EH-OH: 2-ethylhexanol 2EH-A: 2-ethylhexanoic acid
- succinic acid and / or adipic acid is 70 to 30 mol%
- terephthalic acid, phthalic acid and / or isophthalic acid is 30 to 70 mol%
- glycol is ethylene glycol, 1,2-propylene glycol, 1,3-butanediol, 2-methyl-1,3-propanediol
- a polyester plastic having a stopper of acetic acid and / or benzoic acid, and a weight average molecular weight of 600-2000
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Abstract
Description
本発明に用いられるセルロース系樹脂は、特に限定されないが、セルロースの低級脂肪酸エステルを含有するものであることが好ましい。セルロースの低級脂肪酸エステルにおける低級脂肪酸とは、炭素原子数が6以下の脂肪酸を意味し、セルロースの低級脂肪酸エステルとしては、例えば、セルロースアセテート、セルロースプロピオネート、セルロースブチレート等や、特開平10-45804号公報、特開平8-231761号公報、米国特許第2,319,052号明細書等に記載されているようなセルロースアセテートプロピオネート、セルロースアセテートブチレート等の混合脂肪酸エステルを挙げることができる。上記記載のセルロースの低級脂肪酸エステルの中でも、特に好ましく用いられるセルロースの低級脂肪酸エステルは、セルローストリアセテートである。
2.6≦X+Y≦3.0 (I)
及び下記式(II)、
0≦X≦2.5 (II)
を同時に満たすセルロースエステルである。
残留溶剤量=〔(加熱処理前のフィルム質量-加熱処理後のフィルム質量)/(加熱処理後のフィルム質量)〕×100(%)
尚、残留溶剤量を測定する際の加熱処理とは、フィルムを115℃で1時間加熱することをいう。また、セルロースエステルフィルムの乾燥工程においては、支持体より剥離したフィルムを更に乾燥し、残留溶剤量を3質量%以下にすることが好ましく、更に0.5質量%以下が好ましい。フィルム乾燥工程では一般にロール懸垂方式か、テンター方式でフィルムを搬送しながら乾燥する方式が採られる。
Ro=(Nx-Ny)×d
式中、Nxはフィルムの製膜方向に平行な方向におけるフィルムの屈折率、Nyは製膜方向に垂直な方向におけるフィルムの屈折率、dはフィルムの厚み(nm)をそれぞれ表す。
p≦1-sin2(2θ1)・sin2(πR0/λ)
pは、0.99900以上であることが好ましく、0.99990以上であることがより好ましく、0.99995以上であることが更に好ましく、0.99999以上であることが特に好ましい。λは、Ro及びθ1を求めるための三次元屈折率測定の際の光の波長(nm)を表し、380~650nmの範囲にある。λが590nmのときに上式を満たすことが好ましく、更に好ましくはλが400nmのときに上式を満たすことである。
アセチルセルロース(酢化度61.5%、重合度260)をメチレンクロライド90質量部とメチルアルコール10質量部とからなる混合溶剤に撹拌しながら溶解し、濃度15%の溶液とした。これに下記表2に示すNo.1~No.13の可塑剤を夫々アセチルセルロースに対して10質量%混合し、溶液を金属支持体上に流延し約0.1mmの厚さに製膜し、フィルムを作製した。
可塑剤を下記の表3に示すNo.A~No.Gのものに代えた以外は実施例と同様にしてフィルムを作製した。
サンプルを10cm×10cmのサイズに裁断し、23℃、55%RHで1日放置後、80℃、90%RHの条件下で2週間放置し、さらに23℃、55%RHで1日放置した後、サンプル表面のブリードを目視観察し、評価基準は、以下の三段階とした。
○;ブリードがないもの
△;若干のブリードが認められるもの
×;ブリードが激しいもの
JIS Z 0208に記載の方法に従い透湿度を測定した。測定条件は25℃、90%RHである。接着剤や偏光子が水分で劣化するのを防ぐためには透湿度は300g/m2以下が好ましく、200g/m2以下がより好ましく、150g/m2以下が更に好ましい。
AA:アジピン酸
PA:フタル酸
IPA:イソフタル酸
TPA:テレフタル酸
EG:エチレングリコール
PG:1,2-プロピレングリコール
13BG:1,3-ブタンジオール
2MPG:2-メチル-1,3-プロパンジオール
14BG:1,4-ブタンジオール
2EH-OH:2-エチルヘキサノール
2EH-A:2-エチルヘキサン酸
多塩基酸、グリコール及びストッパーから得られるポリエステル系可塑剤を使用した場合であって、多塩基酸中、アジピン酸の割合が70モル%を超える場合(比較例1)にはブリードは生じないが、透湿度が高い。アジピン酸が30モル%を下回る場合(比較例2)には、ブリードを生じる。また、グリコールとして、1,4-ブタンジオールを用いた場合(比較例3)には若干のブリードを生じ、透湿度も高い。ストッパーを用いない場合(比較例4)には、ブリードを生じないが、透湿度が高く、ストッパーとして2-エチルヘキサノール(比較例5)もしくは2-エチルヘキシル酸を用いる場合(比較例6)はブリードが生じる。さらに、ポリエステル系可塑剤の重量平均分子量が2000を上回る場合(比較例7)はブリードが生じる。
これに対し、多塩基酸中、コハク酸及び/又はアジピン酸が70モル~30モル%で、テレフタル酸、フタル酸及び/又はイソフタル酸が30~70モル%であり、グリコールが、エチレングリコール、1,2-プロピレングリコール、1,3-ブタンジオール、2-メチル-1,3-プロパンジオールであり、ストッパーが酢酸及び/又は安息香酸であり、重量平均分子量が600~2000であるポリエステル系可塑剤を使用した場合(実施例1~13)にはブリードが見られず、また、フィルムの透湿度が低い。
Claims (4)
- セルロース系樹脂に、(A)ポリエステル系可塑剤を添加して得られるセルロース系樹脂組成物であって、(A)ポリエステル系可塑剤が、多塩基酸、グリコール及びストッパーから得られ、前記多塩基酸中、コハク酸及び/又はアジピン酸が70~30モル%、テレフタル酸、フタル酸及びイソフタル酸からなる群から選ばれる少なくとも一種が30~70モル%であり、前記グリコールが、エチレングリコール、1,2-プロピレングリコール、1,3-ブタンジオール、2-メチル-1,3-プロパンジオールからなる群から選ばれる少なくとも一種であり、前記ストッパーが酢酸及び/又は安息香酸であり、重量平均分子量が600~2000であることを特徴とするセルロース系樹脂組成物。
- 前記セルロース系樹脂100質量部に対し、前記(A)ポリエステル系可塑剤が3~50質量部添加されていることを特徴とする請求項1記載のセルロース系樹脂組成物。
- 前記セルロース系樹脂が、セルローストリアセテートであることを特徴とする請求項1記載のセルロース系樹脂組成物。
- 請求項1記載のセルロース系樹脂組成物から得られることを特徴とするセルロース系樹脂フィルム。
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KR20110113753A (ko) | 2011-10-18 |
EP2392613A4 (en) | 2014-04-16 |
KR101646621B1 (ko) | 2016-08-08 |
US8668771B2 (en) | 2014-03-11 |
EP2392613A1 (en) | 2011-12-07 |
JP5551618B2 (ja) | 2014-07-16 |
JPWO2010087219A1 (ja) | 2012-08-02 |
US20110277664A1 (en) | 2011-11-17 |
EP2392613B1 (en) | 2015-04-29 |
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