WO2014027594A1 - セルロースエステル樹脂用改質剤、セルロースエステル光学フィルムおよび偏光板用保護フィルム - Google Patents
セルロースエステル樹脂用改質剤、セルロースエステル光学フィルムおよび偏光板用保護フィルム Download PDFInfo
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- WO2014027594A1 WO2014027594A1 PCT/JP2013/071393 JP2013071393W WO2014027594A1 WO 2014027594 A1 WO2014027594 A1 WO 2014027594A1 JP 2013071393 W JP2013071393 W JP 2013071393W WO 2014027594 A1 WO2014027594 A1 WO 2014027594A1
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- Prior art keywords
- cellulose ester
- film
- ester resin
- resin
- modifier
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- JSNLAQIALMCPKD-UHFFFAOYSA-N CO[NH+](N(NN=NN1)N1[NH+]([O-])OC)[O-] Chemical compound CO[NH+](N(NN=NN1)N1[NH+]([O-])OC)[O-] JSNLAQIALMCPKD-UHFFFAOYSA-N 0.000 description 1
- BIDBXBYYLJZRCE-UHFFFAOYSA-N CO[NH+](N(NNNN1)N1[NH+]([O-])OC)[O-] Chemical compound CO[NH+](N(NNNN1)N1[NH+]([O-])OC)[O-] BIDBXBYYLJZRCE-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/199—Acids or hydroxy compounds containing cycloaliphatic rings
-
- 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
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
-
- 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
- C08G63/52—Polycarboxylic acids or polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation
- C08G63/54—Polycarboxylic acids or polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation the acids or hydroxy compounds containing carbocyclic rings
-
- 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
- C08L1/12—Cellulose acetate
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- G02B1/105—
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- 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
-
- 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
- C08J2301/12—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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Definitions
- the present invention relates to a cellulose ester resin modifier that can be used in various applications including an optical film such as a polarizing plate protective film, a cellulose ester optical film containing the modifier, and a polarizing plate protection. Related to film.
- the liquid crystal display device is generally a laminated structure having a layer made of an electrode and a layer made of a liquid crystal substance (liquid crystal layer) between two glass substrates.
- a polarizing plate is attached to the surface of the glass substrate opposite to the liquid crystal layer.
- a polarizing plate usually, a polarizing plate made of polyvinyl alcohol (PVA) with protective films attached to both sides is used.
- PVA polyvinyl alcohol
- protective film a cellulose ester film having generally high transparency and optical isotropy, an appropriate strength, and excellent adhesion to PVA is used.
- the cellulose ester film has excellent optical isotropy in the film plane, but has optical anisotropy in the thickness direction. Therefore, when a liquid crystal screen using a cellulose ester film is viewed from an oblique direction, the color of the displayed image may appear different from the original color. Therefore, in order to optimize the visibility of the liquid crystal display device from an oblique direction, it is necessary to grasp the degree of optical anisotropy in the thickness direction of the film and to perform optical design of the display device in consideration thereof. there were.
- the degree of optical anisotropy of an optical film can generally be grasped by a retardation value.
- the retardation value in the thickness direction of the film (hereinafter also referred to as “Rth”) is defined by the following formula (1).
- Rth [(nx + ny) / 2 ⁇ nz] ⁇ d (1)
- nx is the refractive index in the slow axis direction in the film plane
- ny is the refractive index in the fast axis direction in the film plane
- nz is the refractive index in the thickness direction of the film
- d is It is the thickness (nm) of the film.
- the cellulose ester film also serves as a protective film for the polarizer.
- a normal film cannot sufficiently prevent moisture (water) from entering the polarizer from the outside, and as a result, it may cause deterioration of the polarizer and separation of the polarizer and the film. It was. Therefore, until now, by using a film obtained by adding a plasticizer such as triphenyl phosphate (TPP) to the cellulose ester resin, for example, as a “protective film for polarizing plate”, the moisture permeability resistance is improved. I was planning.
- TPP triphenyl phosphate
- plasticizers such as TPP, which are widely used for cellulose ester films, have sufficient moisture resistance and low Rth to a practically sufficient level. Ideally, cellulose ester has Rth close to zero. A film could not be obtained.
- a cellulose ester resin modifier capable of reducing the retardation value (Rth) in the thickness direction of the cellulose ester film to a practically sufficient level and imparting excellent moisture permeability to the film, for example, Obtained by reacting glycol (a) having 2 to 4 carbon atoms, aliphatic dicarboxylic acid (b) having 2 to 6 carbon atoms, monoalcohol and / or monocarboxylic acid (c) having 4 to 9 carbon atoms,
- a cellulose ester resin modifier characterized by comprising an aliphatic polyester (A) having a number average molecular weight of 1000 to 3000 has been disclosed (for example, see Patent Document 1).
- Patent Document 1 discloses an aliphatic polyester resin having a number average molecular weight of 1500 obtained by reacting propylene glycol, succinic acid and 1-butanol.
- the Rth value is likely to change as the environmental humidity changes. Therefore, a liquid crystal display device using such a film causes a problem of image quality deterioration in a high humidity environment.
- the problem to be solved by the present invention is that the retardation value (Rth) in the thickness direction of the cellulose ester film can be lowered to a practically sufficient level, ideally to a value close to zero,
- a cellulose ester resin modifier capable of imparting moisture permeation resistance to a film containing a cellulose ester resin and capable of obtaining a film having a small change in Rth value with respect to humidity change, and a cellulose ester film using the same, and It is providing the protective film for polarizing plates.
- the present inventors have found that a polyester resin system having a cyclohexane ring or a cyclohexene ring in the main chain skeleton and polymerized by ester bonds at the 1-position and 2-position of these rings is modified.
- the present inventors have found that a quality agent can solve the above-mentioned problems and have completed the present invention.
- the present invention has the following general formula (1) or general formula (2).
- each R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- N is an integer of 1 to 10
- m is an integer of 1 to 8.
- the present invention also provides a cellulose ester film comprising the cellulose ester resin modifier and a cellulose ester resin.
- the present invention provides a resin solution obtained by dissolving the cellulose ester resin modifier and cellulose ester resin in an organic solvent, and casting the solution on a metal support, and then evaporating the organic solvent and drying.
- the protective film for polarizing plates characterized by being obtained is provided.
- a cellulose ester resin modifier capable of reducing the retardation value (Rth) in the thickness direction of the cellulose ester film to a practically sufficient level.
- the cellulose-ester film excellent in moisture permeability can be provided by using this modifier.
- this film also has the effect that there is little change of Rth value with respect to humidity change.
- a film having such excellent characteristics can be preferably used for a polarizing plate protective film, an optical compensation film, a retardation film, and the like.
- the cellulose ester resin modifier of the present invention contains a polyester resin (A) having a structure represented by the following general formula (1) or general formula (2) in the main chain skeleton.
- each R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- N is an integer of 1 to 10
- m is an integer of 1 to 8.
- the polyester resin (A) has, for example, a dibasic acid having a cyclohexane ring as an aliphatic dibasic acid, and having a carboxyl group at positions 1 and 2 of the cyclohexane ring, or a cyclohexene ring.
- a dibasic acid containing a dibasic acid having a carboxyl group at positions 1 and 2 of the cyclohexene ring with a divalent alcohol.
- Examples of the dibasic acid having a cyclohexane ring and having a carboxyl group at the 1-position and 2-position of the cyclohexane ring include 1,2-dicarboxycyclohexane, 1,2-dicarboxy-3-methyl, for example. -Cyclohexane, 1,2-dicarboxy-4-methyl-cyclohexane and the like. These may be used alone or in combination of two or more. Further, these acid anhydrides may be used.
- Examples of the dibasic acid having a cyclohexene ring and having carboxyl groups at the 1-position and 2-position of the cyclohexene ring include 1,2-dicarboxycyclohexene, 1,2-dicarboxy-3-methyl, and the like. -Cyclohexene, 1,2-dicarboxy-4-methyl-cyclohexene and the like. These may be used alone or in combination of two or more. Further, these acid anhydrides may be used.
- 1,2-dicarboxycyclohexane and 1,2-dicarboxycyclohexene are preferable because a cellulose ester film having excellent moisture permeability resistance can be obtained. Accordingly, among the modifiers for cellulose ester resins of the present invention, it is obtained by reacting a dibasic acid with a dihydric alcohol, and the dibasic acid is 1,2-dicarboxycyclohexane or 1,2-dicarboxyl.
- a cellulose ester resin modifier which is a dibasic acid containing cyclohexene is preferred.
- the cyclohexene ring has a dibasic acid or a cyclohexene ring having a cyclohexane ring, and having a carboxyl group at positions 1 and 2 of the cyclohexane ring.
- Other dibasic acids may be used in combination with the dibasic acid having carboxyl groups at the 1- and 2-positions of the ring for the purpose of controlling the compatibility with the cellulose ester resin.
- examples of other dibasic acids include aliphatic dibasic acids and aromatic dibasic acids.
- aliphatic dibasic acid examples include aliphatic dibasic acids having 2 to 6 carbon atoms. Specific examples include malonic acid, succinic acid, glutaric acid, adipic acid, maleic acid, fumaric acid. An acid etc. are mentioned. These may be used alone or in combination of two or more.
- aromatic dibasic acid examples include phthalic acid, terephthalic acid, isophthalic acid, 1,5-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, and the like. These may be used alone or in combination of two or more.
- dibasic acids to be used in combination aliphatic dibasic acids are preferable, because succinic acid is preferable because a modifier for cellulose ester resin can be obtained that lowers the retardation value (Rth) in the thickness direction of the film containing cellulose ester resin. Is preferred.
- the cyclohexane ring has a dibasic acid or cyclohexene ring having a carboxyl group at positions 1 and 2 of the cyclohexane ring, and a carboxyl group at positions 1 and 2 of the cyclohexene ring.
- the amount of the dibasic acid used is 5 to 100 parts by mass with respect to 100 parts by mass of the dibasic acid, because a modifier for cellulose ester resin that can further suppress fluctuations in the Rth value with respect to humidity change can be obtained.
- the amount is preferably 15 to 100 parts by mass.
- an aliphatic alcohol having 2 to 4 carbon atoms can be preferably raised.
- examples of such alcohols include ethylene glycol, 1,2-propylene glycol, 1,3-propanediol, 2-methylpropanediol, 1,2-butanediol, 1,3-butanediol, 1,4- Examples include butanediol and 2,3-butanediol.
- ethylene glycol and 1,2-propylene glycol are preferable because a cellulose ester resin modifier capable of imparting sufficient moisture resistance to the cellulose ester film can be obtained.
- these may be used independently and may use 2 or more types together.
- polyester resins (A) a polyester resin obtained by reacting the dibasic acid with a divalent alcohol has a hydroxyl group or a carboxyl group at the terminal. These hydroxyl groups and carboxyl groups may be reacted with a compound having a reactive group that reacts with them. By sealing the terminal by such a reaction, there is an effect that moisture permeability resistance can be further imparted to the cellulose ester film.
- Method 1 having a cyclohexane ring and having a dibasic acid or cyclohexene ring having a carboxyl group at positions 1 and 2 of the cyclohexane ring, and carboxyl at positions 1 and 2 of the cyclohexene ring
- Method 1 having a cyclohexane ring and having a dibasic acid or cyclohexene ring having a carboxyl group at positions 1 and 2 of the cyclohexane ring, and carboxyl at positions 1 and 2 of the cyclohexene ring
- a dibasic acid including a dibasic acid having a group, a divalent alcohol, and a monocarboxylic acid are collectively charged into a reaction system and reacted.
- Method 2 having a cyclohexane ring and having a dibasic acid or a cyclohexene ring having a carboxyl group at positions 1 and 2 of the cyclohexane ring, and carboxyl at positions 1 and 2 of the cyclohexene ring
- Method 3 having a cyclohexane ring and having a dibasic acid or cyclohexene ring having a carboxyl group at positions 1 and 2 of the cyclohexane ring, and carboxyl at positions 1 and 2 of the cyclohexene ring
- a dibasic acid including a dibasic acid having a group, a dihydric alcohol, and a monoalcohol are collectively charged into a reaction system and reacted.
- Method 4 having a cyclohexane ring and having a dibasic acid or a cyclohexene ring having a carboxyl group at positions 1 and 2 of the cyclohexane ring, and carboxyl at positions 1 and 2 of the cyclohexene ring
- Examples of the monocarboxylic acid include monocarboxylic acids having 2 to 9 carbon atoms such as acetic acid, propanoic acid, butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, 2-ethylhexylic acid, and nonanoic acid, and monocarboxylic acids.
- Carboxylic anhydride can be exemplified as a preferred compound. These may be used alone or in combination of two or more.
- Examples of the monoalcohol include 1-butanol, 2-butanol, isobutanol, t-butanol, 1-pentanol, isopentyl alcohol, tert-pentyl alcohol, cyclopentanol, 1-hexanol, cyclohexanol, 1- Preferred examples include monoalcohols having 4 to 9 carbon atoms such as heptanol, 1-octanol, 2-ethyl-1-hexanol, isononyl alcohol, 1-nonyl alcohol and the like. These may be used alone or in combination of two or more.
- the acid value of the polyester resin (A) is preferably 3 or less, more preferably 1 or less because it imparts excellent moisture permeability to the film and maintains the stability of the cellulose ester resin modifier itself.
- the hydroxyl value is preferably 200 or less, and more preferably 150 or less.
- the polyester resin (A) is produced, for example, by subjecting the raw material to an esterification reaction in the presence of an esterification catalyst as necessary, for example, in a temperature range of 180 to 250 ° C. for 10 to 25 hours. can do.
- an esterification catalyst as necessary, for example, in a temperature range of 180 to 250 ° C. for 10 to 25 hours. can do.
- conditions, such as temperature of esterification reaction and time are not specifically limited, You may set suitably.
- esterification catalyst examples include titanium catalysts such as tetraisopropyl titanate and tetrabutyl titanate; tin catalysts such as dibutyltin oxide; and organic sulfonic acid catalysts such as p-toluenesulfonic acid.
- the amount of the esterification catalyst used may be set as appropriate, but usually it is preferably used in the range of 0.001 to 0.1 parts by mass with respect to 100 parts by mass of the total amount of raw materials.
- the number average molecular weight (Mn) of the polyester resin (A) is preferably in the range of 500 to 3,000, more preferably in the range of 500 to 1,500, since the compatibility with the cellulose ester resin is improved.
- the number average molecular weight (Mn) is a value in terms of polystyrene based on gel permeation chromatography (GPC) measurement.
- the measurement conditions for GPC are as follows.
- the properties of the polyester resin (A) vary depending on the number average molecular weight (Mn) and composition, but are usually liquid, solid, paste, etc. at room temperature.
- the cellulose ester resin modifier of the present invention contains the polyester resin (A).
- the modifier for cellulose ester resin of the present invention may be a modifier composed solely of the polyester resin (A), or may contain a polyester other than the polyester resin (A). Moreover, the modifier other than polyester may be included, and the raw material used for manufacture of the polyester resin (A) may be included.
- the modifier of the present invention can be made into a cellulose ester resin composition by mixing with a cellulose ester resin.
- the retardation value (Rth) in the thickness direction is lowered to a practically sufficient level, and an optical film having excellent moisture permeability and little change in Rth value with respect to humidity change can be obtained.
- cellulose ester resin examples include those obtained by esterifying part or all of the hydroxyl groups of cellulose obtained from cotton linter, wood pulp, kenaf, etc. Among them, cellulose obtained from cotton linter A film obtained by using a cellulose ester resin obtained by esterifying is preferable because it can be easily peeled off from the metal support constituting the film production apparatus and the production efficiency of the film can be further improved. *
- cellulose ester resin examples include cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, and cellulose nitrate.
- cellulose ester optical film is used as a protective film for a polarizing plate. It is preferable to use cellulose acetate because a film having excellent mechanical properties and transparency can be obtained.
- These cellulose ester resins may be used alone or in combination of two or more.
- the cellulose acetate preferably has a degree of polymerization of 250 to 400, an acetylation degree of preferably 54.0 to 62.5% by mass, and more preferably 58.0 to 62.5% by mass. If the cellulose acetate has a polymerization degree and an acetylation degree within a range, a film having excellent mechanical properties can be obtained. In the present invention, it is more preferable to use so-called cellulose triacetate.
- the acetylation degree said by this invention is the mass ratio of the acetic acid produced
- cellulose acetate examples include, for example, cellulose diacetate, cellulose triacetate and the like, and among these, cellulose triacetate is preferable.
- the number average molecular weight (Mn) of the cellulose acetate is preferably in the range of 70,000 to 300,000, and more preferably in the range of 80,000 to 200,000. If the (Mn) of the cellulose acetate is within such a range, a film having excellent mechanical properties can be obtained.
- the cellulose ester resin modifier of the present invention in the cellulose ester resin composition is preferably in the range of 5 to 30 parts by mass, more preferably in the range of 5 to 15 parts by mass with respect to 100 parts by mass of the cellulose ester resin. preferable. If the cellulose ester resin modifier is used in such a range, a cellulose ester optical film having moisture permeability resistance and low Rth can be obtained.
- the cellulose ester film of the present invention is a film comprising the cellulose ester resin, the cellulose ester resin modifier, and various other additives as required, and in particular, a cellulose ester optical film for optical use. Can be preferably used.
- the film thickness of the cellulose ester film of the present invention varies depending on the intended use, but is generally preferably in the range of 10 to 200 ⁇ m.
- the cellulose ester film of the present invention can also be obtained by using a cellulose ester resin composition containing the cellulose ester resin and the cellulose ester resin modifier.
- the cellulose ester optical film may have characteristics such as optical anisotropy or optical isotropy.
- optical anisotropy or optical isotropy.
- the optical film when used as a protective film for a polarizing plate, it does not inhibit light transmission. It is preferable to use an optically isotropic film.
- the cellulose ester optical film can be used in various applications. As the most effective use, for example, there is a protective film for a polarizing plate that requires optical isotropy of a liquid crystal display device, but it is also used for a support for a protective film for a polarizing plate that requires an optical compensation function. Can do.
- the cellulose ester optical film can be used for liquid crystal cells in various display modes.
- IPS In-Plane Switching
- TN Transmission Nematic
- VA Very Aligned: Vertically Aligned
- OCB Optically ⁇ ⁇ Compensatory Bend
- the cellulose ester resin modifier of the present invention contained in the cellulose ester optical film of the present invention is preferably in the range of 5 to 30 parts by mass with respect to 100 parts by mass of the cellulose ester resin. A range of parts is more preferred. If the cellulose ester resin modifier is used in such a range, a cellulose ester optical film having moisture permeability resistance and low Rth can be obtained.
- the cellulose ester optical film is obtained by melting a cellulose ester resin composition containing the cellulose ester resin, a modifier for cellulose ester resin, and other various additives as necessary, for example, with an extruder or the like. It can be obtained by kneading and forming into a film using a T-die or the like. Moreover, the said cellulose-ester resin composition can also be used instead of the said cellulose-ester resin and the modifier for cellulose-ester resins.
- the cellulose ester optical film may be prepared by, for example, dissolving a resin solution obtained by dissolving the cellulose ester resin and the cellulose ester resin modifier in an organic solvent on a metal support. And then molding by a so-called solution casting method (solvent casting method) in which the organic solvent is distilled off and dried.
- solution casting method solvent casting method
- the resulting film substantially exhibits optical isotropy.
- the film showing optical isotropy can be used for an optical material such as a liquid crystal display, and is particularly useful as a protective film for a polarizing plate.
- the film obtained by the said method cannot form an unevenness
- the solution casting method generally includes a first step in which the cellulose ester resin and the cellulose ester resin modifier are dissolved in an organic solvent, and the resulting resin solution is cast on a metal support; A second step of forming a film by distilling off the organic solvent contained in the cast resin solution, followed by peeling the film formed on the metal support from the metal support and drying by heating. It consists of a 3rd process.
- Examples of the metal support used in the first step include endless belt-shaped or drum-shaped metal supports, for example, stainless steel with a mirror-finished surface can be used. .
- the drying method in the second step is not particularly limited.
- it is included in the cast resin solution by applying air in a temperature range of 30 to 50 ° C. to the upper surface and / or the lower surface of the metal support.
- Examples thereof include a method of evaporating 50 to 80% by mass of an organic solvent to form a film on the metal support.
- the third step is a step in which the film formed in the second step is peeled off from the metal support and is heated and dried under a temperature condition higher than that in the second step.
- a heat drying method for example, a method in which the temperature is raised stepwise under a temperature condition of 100 to 160 ° C. is preferable because good dimensional stability can be obtained.
- the organic solvent remaining in the film after the second step can be almost completely removed by heating and drying under the temperature condition.
- the organic solvent can be recovered and reused.
- the organic solvent that can be used when the cellulose ester resin and the cellulose ester resin modifier are mixed and dissolved in an organic solvent is not particularly limited as long as they can be dissolved.
- a poor solvent such as methanol, ethanol, 2-propanol, n-butanol, cyclohexane, cyclohexanone together with the good solvent in order to improve the production efficiency of the film.
- the concentration of the cellulose ester resin in the resin solution is preferably 10 to 50% by mass, more preferably 15 to 35% by mass.
- the additive examples include other modifiers other than the modifier for cellulose ester resin of the present invention, thermoplastic resins, ultraviolet absorbers, matting agents, deterioration inhibitors (for example, antioxidants, peroxides). Decomposition agents, radical inhibitors, metal deactivators, acid scavengers, etc.) and dyes. These additives can be used together when the cellulose ester resin and the modifier for cellulose ester resin are dissolved and mixed in the organic solvent, and may be used separately. Not limited.
- modifiers other than the cellulose ester resin modifier include, for example, phosphate esters such as triphenyl phosphate (TPP), tricresyl phosphate, and cresyl diphenyl phosphate, dimethyl phthalate, diethyl phthalate, and dibutyl phthalate.
- Phthalic acid esters such as di-2-ethylhexyl phthalate, ethyl phthalyl ethyl glycolate, butyl phthalyl butyl glycolate, trimethylolpropane tribenzoate, pentaerythritol tetraacetate, tributyl acetylcitrate and the like.
- thermoplastic resin is not particularly limited, and examples thereof include polyester resins other than the cellulose ester resin modifier of the present invention, polyester ether resins, polyurethane resins, epoxy resins, and toluenesulfonamide resins.
- the ultraviolet absorber is not particularly limited, and examples thereof include oxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, benzophenone compounds, cyanoacrylate compounds, nickel complex compounds, and the like.
- the ultraviolet absorber is preferably in the range of 0.01 to 2 parts by mass with respect to 100 parts by mass of the cellulose ester resin.
- matting agent examples include silicon oxide, titanium oxide, aluminum oxide, calcium carbonate, calcium silicate, aluminum silicate, magnesium silicate, calcium phosphate, kaolin, and talc.
- the matting agent is preferably in the range of 0.1 to 0.3 parts by mass with respect to 100 parts by mass of the cellulose ester resin.
- the type and amount of the dye are not particularly limited as long as they do not impair the object of the present invention.
- the cellulose ester optical film of the present invention is excellent in moisture permeation resistance and transparency, and has a sufficiently small optical anisotropy in the thickness direction, so that it can be used for an optical film of a liquid crystal display device, for example.
- the optical film of the liquid crystal display device include a protective film for a polarizing plate, a retardation film, a reflective film, a viewing angle improving film, an antiglare film, an antireflective film, an antistatic film, and a color filter. Among these, it can use preferably as a protective film for polarizing plates.
- the film thickness of the cellulose ester optical film is preferably in the range of 20 to 120 ⁇ m, more preferably in the range of 25 to 100 ⁇ m, and particularly preferably in the range of 25 to 80 ⁇ m.
- a film thickness in the range of 25 to 80 ⁇ m is suitable for reducing the thickness of the liquid crystal display device, and has sufficient film strength and Rth stability. Excellent performance such as moisture permeability resistance can be maintained.
- the cellulose ester optical film of the present invention has a very small retardation value (Rth) of 5 to -15 nm.
- Rth retardation value
- the cellulose ester optical film of the present invention is allowed to stand for 12 hours in an environment having a relative humidity of 20% at 25 ° C., and then when the Rth value at a wavelength of 590 nm is measured, the Rth value is 5 to ⁇ 15 nm. It becomes an optical film.
- a birefringence measuring apparatus “KOBRA-WR” manufactured by Oji Scientific Instruments Co., Ltd. can be used for measurement of the Rth value. Therefore, it is extremely useful as a material having excellent optical isotropy.
- the cellulose ester optical film of the present invention As one of the characteristics of the cellulose ester optical film of the present invention, as described above, there is also an effect that there is little change in Rth value ( ⁇ Rth value) with respect to humidity change. Specifically, the cellulose ester optical film of the present invention is allowed to stand for 12 hours in an environment having a relative humidity of 35% at 25 ° C., and after measuring the Rth value at a wavelength of 590 nm, the optical film is subjected to a relative humidity at 25 ° C. Is a film in which the absolute value ( ⁇ Rth value) of the difference in Rth is 4 to 10 when the Rth value at a wavelength of 590 nm is measured for 12 hours in an environment of 85%.
- a preferred embodiment of the cellulose ester optical film of the present invention is allowed to stand for 12 hours in an environment at 25 ° C. and a relative humidity of 20%, and then when the Rth value at a wavelength of 590 nm is measured, The optical film was placed in an environment of -15 nm and a relative humidity of 35% at 25 ° C. for 12 hours and the Rth value at a wavelength of 590 nm was measured.
- the cellulose ester optical film is allowed to stand for 12 hours and has an Rth difference absolute value ( ⁇ Rth value) of 4 to 10 when the Rth value at a wavelength of 590 nm is measured.
- the polarizing plate protective film can be adjusted to a desired Rth without causing bleed under high temperature and high humidity, it can be widely used in various liquid crystal display systems depending on the application. Can do.
- the cellulose ester optical film and the polarizing plate protective film are excellent in moisture permeability resistance and have a very small level of Rth and small optical anisotropy. It can be used as a support for silver photographic light-sensitive materials. Although it does not specifically limit with the said optical film, for example, the protective film for polarizing plates, retardation film, a reflecting plate, a viewing angle improvement film, an anti-glare film, a non-reflective film, an antistatic film, a color filter etc. are mentioned.
- a film having a low Rth is a protective film for a polarizing plate that requires optical isotropy and a polarizing plate having a viewing angle compensation function. It can be used as a support for a protective film.
- Example 1 Modifier for cellulose ester resin of the present invention
- EG ethylene glycol
- PG 1,2-propylene glycol
- TIPT tetraisopropyl titanate
- a polyester resin having the structure represented by the general formula (1) [modifier for cellulose ester resin (1) of the present invention] was obtained.
- the obtained modifier (1) was a pale yellow liquid at room temperature, an acid value of 0.57, a hydroxyl value of 112.2, and a number average molecular weight of 980.
- Example 2 (same as above) In a 1-liter three-necked flask, 173 g of EG and 213 g of PG as a glycol component, 348 g of HHPA as a dicarboxylic acid component, 267 g of succinic acid (hereinafter abbreviated as “SA”) and 0.03 g of TIPT as a catalyst are charged, and nitrogen is supplied from a nitrogen introduction tube.
- SA succinic acid
- TIPT succinic acid
- the reaction was carried out at 220 ° C. for 24 hours under an air stream to obtain a polyester resin having the structure represented by the general formula (1) [modifier for cellulose ester resin (2) of the present invention].
- the obtained modifier (2) was a light yellow liquid at room temperature, an acid value of 0.40, a hydroxyl value of 112.6, and a number average molecular weight of 1210.
- Example 3 (same as above) A 1-liter three-necked flask was charged with 134 g of EG as a glycol component, 166 g of PG, 207 g of n-butanol as a monohydric alcohol component, 403 g of HHPA as a dicarboxylic acid component, 309 g of SA, and 0.03 g of TIPT as a catalyst. The mixture was reacted at 220 ° C. for 30 hours under a nitrogen stream to obtain a polyester resin having the structure represented by the general formula (1) [modifier for cellulose ester resin (3) of the present invention]. The obtained modifier (3) was a light yellow liquid at room temperature, an acid value of 0.40, a hydroxyl value of 2.6, and a number average molecular weight of 980.
- Example 4 (same as above) In a 1-liter three-necked flask, 173 g of EG and 213 g of PG as a glycol component, 348 g of HHPA and 267 g of SA as a dicarboxylic acid component, and 0.03 part of TIPT as a catalyst were reacted for 24 hours at 220 ° C. in a nitrogen stream from a nitrogen introduction tube. I let you. After the reaction, 195 g of acetic anhydride was added to the obtained polyester polyol and reacted at 130 ° C. for 2 hours.
- the obtained modifier (4) was a light yellow liquid at room temperature, an acid value of 0.40, a hydroxyl value of 0.5, and a number average molecular weight of 1200.
- Example 5 (same as above) In a 1-liter three-necked flask, 202 g of EG as a glycol component, 247 g of PG, 399 g of 1,2-dicarboxy-4-cyclohexene (hereinafter abbreviated as “THPA”) as a dicarboxylic acid component, 310 g of SA, and TIPT as a catalyst.
- a polyester resin having a structure represented by the general formula (2) [the modifier for cellulose ester resin (5) of the present invention] having a structure represented by the general formula (2) is allowed to react at 220 ° C. for 24 hours under a nitrogen stream from a nitrogen introduction tube. Obtained.
- the obtained modifier (5) was a light yellow liquid at room temperature, an acid value of 0.58, a hydroxyl value of 118.0, and a number average molecular weight of 1140.
- Example 6 (same as above) A 1-liter three-necked flask was charged with 217 g of EG as a glycol component, 163 g of n-butanol as a monohydric alcohol component, 208 g of HHPA as a dicarboxylic acid component, 372 g of SA, and 0.03 g of TIPT as a catalyst.
- the polyester resin having the structure represented by the general formula (1) [the modifier for cellulose ester resin (6) of the present invention] was obtained by reacting at 220 ° C. for 30 hours.
- the obtained modifier (6) was paste-like at room temperature, had an acid value of 0.43, a hydroxyl value of 5.4, and a number average molecular weight of 810.
- Example 7 100 parts of triacetyl cellulose resin ("LT-35" manufactured by Daicel Corporation) and 10 parts of modifier for cellulose ester resin (1) were added to a mixed solvent consisting of 810 parts of methylene chloride and 90 parts of methanol, and dissolved. A dope solution was prepared. The dope solution is cast on a glass plate to a thickness of 0.8 mm, dried at room temperature for 16 hours, then dried at 50 ° C. for 30 minutes, and further at 120 ° C. for 30 minutes. A cellulose ester film (1) was obtained. The film thickness of the obtained film (1) was 60 ⁇ m.
- the Rth of the obtained cellulose ester film (1), the amount of change in Rth due to a change in humidity ( ⁇ Rth), and moisture permeability were measured according to the following method. The measurement results are shown in Table 1.
- ⁇ Rth measurement method> The cellulose ester film (1) was allowed to stand for 12 hours in an environment at 25 ° C. and a relative humidity of 20%. Thereafter, the Rth value at a wavelength of 590 nm was measured using a birefringence measuring apparatus (KOBRA-WR, manufactured by Oji Scientific Instruments).
- Examples 8 to 17 Cellulose ester films (2) to (11) were obtained in the same manner as in Example 7 except for the blending ratios shown in Table 1.
- the cellulose ester films (2) to (11) obtained in the same manner as in Example 7 were measured for Rth, Rth change ( ⁇ Rth) due to humidity change, and moisture permeability. The measurement results are shown in Table 1.
- Comparative Example 1 Modifier for Comparative Control Cellulose Ester Resin
- AA adipic acid
- TIPT adipic acid
- the obtained modifier (1 ′) was a white wax-like solid at room temperature, had an acid value of 0.19, a hydroxyl value of 112.2, and a number average molecular weight of 1410.
- Comparative Example 2 (same as above) 186 g of EG and 222 g of PG as a glycol component, 592 g of SA as a dicarboxylic acid component, and 0.03 g of TIPT as a catalyst were charged in a 1-liter three-necked flask, and reacted at 220 ° C. for 24 hours in a nitrogen stream from a nitrogen introduction tube. A cellulose ester resin modifier (2 ′) for control was obtained. The obtained modifier (2 ′) was a pale yellow liquid at room temperature, an acid value of 0.20, a hydroxyl value of 113.0, and a number average molecular weight of 1120.
- Comparative Example 3 (same as above) 119 g of EG, 146 g of PG, 182 g of n-butanol as a monohydric alcohol component, 545 g of SA as a dicarboxylic acid component, and 0.03 g of TIPT as a catalyst are charged into a 1 liter three-necked flask under a nitrogen stream from a nitrogen introduction tube. The mixture was reacted at 220 ° C. for 30 hours to obtain a cellulose ester resin modifier (3 ′) for comparison. The obtained modifier (3 ′) was a light yellow liquid at room temperature, had an acid value of 0.28, a hydroxyl value of 2.6, and a number average molecular weight of 980.
- Comparative Example 4 (same as above) A 1-liter three-necked flask was charged with 150 g of EG as a glycol component, 183 g of PG, 667 g of 1,4-cyclohexanedicarboxylic acid as a dicarboxylic acid component, and 0.03 g of TIPT as a catalyst, and at 220 ° C. in a nitrogen stream from a nitrogen introduction tube. The mixture was reacted for 24 hours to obtain a cellulose ester resin modifier (4 ′) for comparison. The obtained modifier (4 ′) was a pale yellow liquid at room temperature, an acid value of 0.32, a hydroxyl value of 99.7, and a number average molecular weight of 1490.
- Comparative Example 5 (same as above) A 1-liter three-necked flask was charged with 204 g of EG and 250 g of PG as a glycol component, 314 g of SA as a dicarboxylic acid component, 393 g of phthalic anhydride and 0.03 g of TIPT as a catalyst, and 24 ° C. at 220 ° C. in a nitrogen stream from a nitrogen introduction tube.
- the cellulose ester resin modifier (5 ′) for comparison was obtained by reacting for a time.
- the obtained modifier (5 ′) was a pale yellow liquid at room temperature, an acid value of 0.29, a hydroxyl value of 103.8, and a number average molecular weight of 1190.
- Comparative Examples 6 to 13 Comparative Cellulose Ester Film
- Comparative cellulose ester film (1 ′) to comparative cellulose ester film (8 ′) were obtained in the same manner as in Example 7 except for the blending ratio shown in Table 1.
- the cellulose ester films (1 ′) to (8 ′) obtained in the same manner as in Example 6 were measured for Rth, change in Rth due to humidity change ( ⁇ Rth), and moisture permeability. The measurement results are shown in Table 1.
- HHPA 1,2-dicarboxycyclohexane SA: succinic acid
- THPA 1,2-dicarboxycyclohexene
- AA adipic acid
- CHDA 1,4-cyclohexanedicarboxylic acid
- PA phthalic anhydride
- the cellulose ester film obtained in the examples is a stable optical film having low moisture permeability and small retardation change ( ⁇ Rth) with respect to humidity change.
- ⁇ Rth small retardation change
- the moisture permeation resistance and the low Rth and ⁇ Rth are not all satisfied.
- Test Examples 1-5 and Comparative Test Examples 1-3 Using cellulose ester films (1), (3), (6), (8), (10) obtained in Examples and Comparative Examples and comparative cellulose ester films (1 ′), (4 ′) The dimensional stability of the film during moisture absorption was evaluated according to the following method. The evaluation results are shown in Table 2.
- the dimensional stability against humidity was evaluated by the expansion coefficient generated by changing the relative humidity from 40% RH to 80%% RH.
- TMA-SS6100 manufactured by Seiko Instruments Inc.
- a humidity control unit that supports high temperature and high humidity is used for the expansion rate, and a sample with a film thickness of 60 ⁇ m and a width of 3 mm is fixed in the tension mode with a load of 50 mN and a distance between chucks of 20 mm.
- the sample temperature in the furnace was kept constant at 40 ° C., dried for 40 minutes with dry nitrogen having a humidity of 0% RH, then humidified with 40% RH for 40 minutes, further humidified with 80% RH for 40 minutes, and from 40% RH
- the expansion rate was determined from the elongation of the distance between chucks by humidification between 80% RH.
- the cellulose ester film obtained in the examples is an optical film having a small expansion coefficient against humidity change and a stable dimension.
Abstract
Description
〔式中、nxはフィルム面内の遅相軸方向の屈折率であり、nyはフィルム面内の進相軸方向の屈折率であり、nzはフィルムの厚み方向の屈折率であり、dはフィルムの厚さ(nm)である。〕
で表される構造を有するポリエステル樹脂(A)を含有することを特徴とするセルロースエステル樹脂用改質剤を提供するものである。
方法1:シクロヘキサン環を有し、且つ該シクロヘキサン環の1位と2位の位置にカルボキシル基を有する二塩基酸やシクロヘキセン環を有し、且つ該シクロヘキセン環の1位と2位の位置にカルボキシル基を有する二塩基酸を含む二塩基酸と二価のアルコールおよびモノカルボン酸を反応系に一括で仕込み、反応させる方法。
測定装置:東ソー株式会社製「HLC-8220 GPC」
カラム:東ソー株式会社製ガードカラム「HHR-H」(6.0mmI.D.×4cm)+東ソー株式会社製「TSK-GEL GMHHR-N」(7.8mmI.D.×30cm)+東ソー株式会社製「TSK-GEL GMHHR-N」(7.8mmI.D.×30cm)+東ソー株式会社製「TSK-GEL GMHHR-N」(7.8mmI.D.×30cm)+東ソー株式会社製「TSK-GEL GMHHR-N」(7.8mmI.D.×30cm)
検出器:ELSD(オルテック製「ELSD2000」)
データ処理:東ソー株式会社製「GPC-8020モデルIIデータ解析バージョン4.30」
測定条件:カラム温度 40℃
展開溶媒 テトラヒドロフラン(THF)
流速 1.0ml/分
試料:樹脂固形分換算で1.0質量%のテトラヒドロフラン溶液をマイクロフィルターでろ過したもの(5μl)。
標準試料:前記「GPC-8020モデルIIデータ解析バージョン4.30」の測定マニュアルに準拠して、分子量が既知の下記の単分散ポリスチレンを用いた。
東ソー株式会社製「A-500」
東ソー株式会社製「A-1000」
東ソー株式会社製「A-2500」
東ソー株式会社製「A-5000」
東ソー株式会社製「F-1」
東ソー株式会社製「F-2」
東ソー株式会社製「F-4」
東ソー株式会社製「F-10」
東ソー株式会社製「F-20」
東ソー株式会社製「F-40」
東ソー株式会社製「F-80」
東ソー株式会社製「F-128」
東ソー株式会社製「F-288」
東ソー株式会社製「F-550」
1リットル3つ口フラスコに、グリコール成分としてエチレングリコール(以下「EG」と略す。)179g、1,2-プロピレングリコール(以下「PG」と略す)219g、ジカルボン酸成分として1,2-ジカルボキシシクロヘキサン(以下「HHPA」と略す。)700g、及び触媒であるテトライソプロピルチタネート(以下「TIPT」と略す。)0.03gを仕込み、窒素導入管より窒素気流下、220℃で24時間反応させ、一般式(1)で表される構造を有するポリエステル樹脂〔本発明のセルロースエステル樹脂用改質剤(1)〕を得た。得られた改質剤(1)は、常温で淡黄色液体であり、酸価が0.57、水酸基価112.2であり、数平均分子量は980であった。
1リットル3つ口フラスコに、グリコール成分としてEG 173g、PG 213g、ジカルボン酸成分としてHHPA 348g、コハク酸(以下「SA」略す。)267g及び触媒としてTIPT 0.03gを仕込み、窒素導入管より窒素気流下、220℃で24時間反応させ、一般式(1)で表される構造を有するポリエステル樹脂〔本発明のセルロースエステル樹脂用改質剤(2)〕を得た。得られた改質剤(2)は、常温で淡黄色液体であり、酸価が0.40、水酸基価112.6であり、数平均分子量は1210であった。
1リットル3つ口フラスコに、グリコール成分としてEG 134g、PG 166g、1価アルコール成分としてn-ブタノール207g、ジカルボン酸成分としてHHPA 403g、SA 309g及び触媒としてTIPT 0.03gを仕込み、窒素導入管より窒素気流下、220℃で30時間反応させ、一般式(1)で表される構造を有するポリエステル樹脂〔本発明のセルロースエステル樹脂用改質剤(3)〕を得た。得られた改質剤(3)は、常温で淡黄色液体であり、酸価が0.40、水酸基価2.6であり、数平均分子量は980であった。
1リットル3つ口フラスコに、グリコール成分としてEG 173g、PG 213g、ジカルボン酸成分としてHHPA 348g、SA 267g及び触媒としてTIPT0.03部を仕込み、窒素導入管より窒素気流下、220℃で24時間反応させた。反応後、得られたポリエステルポリオールに無水酢酸195gを仕込み、130℃で2時間反応させた。反応後、酢酸および過剰の無水酢酸を減圧によって留去し、一般式(1)で表される構造を有するポリエステル樹脂〔本発明のセルロースエステル樹脂用改質剤(4)〕を得た。得られた改質剤(4)は、常温で淡黄色液体であり、酸価が0.40、水酸基価0.5であり、数平均分子量は1200であった。
1リットル3つ口フラスコに、グリコール成分としてEG 202g、PG 247g、ジカルボン酸成分として1,2-ジカルボキシ-4-シクロヘキセン(以下「THPA」と略す。)399g、SA 310g及び触媒としてTIPT 0.03gを仕込み、窒素導入管より窒素気流下、220℃で24時間反応させ、一般式(2)で表される構造を有するポリエステル樹脂〔本発明のセルロースエステル樹脂用改質剤(5)〕を得た。得られた改質剤(5)は、常温で淡黄色液体であり、酸価が0.58、水酸基価118.0であり、数平均分子量は1140であった。
1リットル3つ口フラスコに、グリコール成分としてEG 217g、1価アルコール成分としてn-ブタノール163g、ジカルボン酸成分としてHHPA 208g、SA 372g及び触媒としてTIPT 0.03gを仕込み、窒素導入管より窒素気流下、220℃で30時間反応させ、一般式(1)で表される構造を有するポリエステル樹脂〔本発明のセルロースエステル樹脂用改質剤(6)〕を得た。得られた改質剤(6)は、常温でペースト状であり、酸価が0.43、水酸基価5.4であり、数平均分子量は810であった。
トリアセチルセルロース樹脂(株式会社ダイセル製「LT-35」)100部、セルロースエステル樹脂用改質剤(1)10部を、メチレンクロライド810部及びメタノール90部からなる混合溶剤に加えて溶解し、ドープ液を調製した。このドープ液をガラス板上に厚さ0.8mmとなるように流延し、室温で16時間乾燥させた後、50℃で30分、さらに120℃で30分乾燥させることで、本発明のセルロースエステルフィルム(1)を得た。得られたフィルム(1)の膜厚は60μmであった。
セルロースエステルフィルム(1)を25℃で相対湿度が20%の環境下に12時間静置した。その後、複屈折測定装置(KOBRA-WR,王子計測器(株)製)を用いて波長590nmにおけるRth値を測定した。
まず、セルロースエステルフィルム(1)を25℃で相対湿度が35%の環境下に12時間静置し、その後、複屈折測定装置(KOBRA-WR,王子計測器(株)製)を用いて波長590nmにおけるRth値を測定した。測定後、25℃で相対湿度が85%の環境下に12時間静置し、上記装置を用いてRth値を測定した。測定して得られたRthの差の絶対値を求め、これをΔRthとした。
JIS Z 0208に準じて、セルロースエステルフィルム(1)の透湿度を測定し、60μmの厚さに換算した。なお、測定条件は、温度40℃、相対湿度90%とした。
第1表に示す配合割合以外は実施例7と同様にしてセルロースエステルフィルム(2)~セルロースエステルフィルム(11)を得た。実施例7と同様にして得られたセルロースエステルフィルム(2)~(11)のRth、湿度変化によるRthの変化量(ΔRth)及び透湿度を測定した。測定結果を第1表に示す。
1リットル3つ口フラスコに、グリコール成分としてEG 341g、ジカルボン酸成分としてアジピン酸(以下「AA」と略す。)659g及び触媒としてTIPT 0.03gを仕込み、窒素導入管より窒素気流下、220℃で24時間反応させ、比較対照用のセルロースエステル樹脂用改質剤(1´)を得た。得られた改質剤(1´)は、常温で白色ワックス状固体であり、酸価が0.19、水酸基価112.2であり、数平均分子量は1410であった。
1リットル3つ口フラスコに、グリコール成分としてEG 186g、PG 222g、ジカルボン酸成分としてSA 592g及び触媒としてTIPT 0.03gを仕込み、窒素導入管より窒素気流下、220℃で24時間反応させ、比較対照用のセルロースエステル樹脂用改質剤(2´)を得た。得られた改質剤(2´)は、常温で淡黄色液体であり、酸価が0.20、水酸基価113.0であり、数平均分子量は1120であった。
1リットル3つ口フラスコに、グリコール成分としてEG 119g、PG 146g、1価アルコール成分としてn-ブタノール182g、ジカルボン酸成分としてSA 545g及び触媒としてTIPT 0.03gを仕込み、窒素導入管より窒素気流下、220℃で30時間反応させ、比較対照用のセルロースエステル樹脂用改質剤(3´)を得た。得られた改質剤(3´)は、常温で淡黄色液体であり、酸価が0.28、水酸基価2.6であり、数平均分子量は980であった。
1リットル3つ口フラスコに、グリコール成分としてEG 150g、PG 183g、ジカルボン酸成分として1,4-シクロヘキサンジカルボン酸667g及び触媒としてTIPT 0.03gを仕込み、窒素導入管より窒素気流下、220℃で24時間反応させ比較対照用のセルロースエステル樹脂用改質剤(4´)を得た。得られた改質剤(4´)は、常温で淡黄色液体であり、酸価が0.32、水酸基価99.7であり、数平均分子量は1490であった。
1リットル3つ口フラスコに、グリコール成分としてEG 204g、PG 250g、ジカルボン酸成分としてSA 314g、無水フタル酸393g及び触媒としてTIPT 0.03gを仕込み、窒素導入管より窒素気流下、220℃で24時間反応させ比較対照用のセルロースエステル樹脂用改質剤(5´)を得た。得られた改質剤(5´)は、常温で淡黄色液体であり、酸価が0.29、水酸基価103.8であり、数平均分子量は1190であった。
第1表に示す配合割合以外は実施例7と同様にして比較対照用セルロースエステルフィルム(1´)~比較対照用セルロースエステルフィルム(8´)を得た。実施例6と同様にして得られたセルロースエステルフィルム(1´)~(8´)のRth、湿度変化によるRthの変化量(ΔRth)及び透湿度を測定した。測定結果を第1表に示す。
HHPA:1,2-ジカルボキシシクロヘキサン
SA:コハク酸
THPA:1,2-ジカルボキシシクロヘキセン
AA:アジピン酸
CHDA:1,4-シクロヘキサンジカルボン酸
PA:無水フタル酸
実施例及び比較例で得られたセルロースエステルフィルム(1)、(3)、(6)、(8)、(10)及び比較対照用セルロースエステルフィルム(1´)、(4´)を用いて、下記方法に従って吸湿におけるフィルムの寸法安定性を評価した。評価結果を第2表に示す。
湿度に対する寸法安定性の評価は、相対湿度を40%RHから80%%RHに変化させることで発生する膨張率にて評価した。膨張率は、高温高湿度対応湿度制御ユニットを取り付けたTMA-SS6100(セイコーインスツルメンツ社製)を用い、膜厚60μm、幅3mmの試料を引張モードにて荷重50mN、チャック間距離20mmの条件で固定、炉内の試料温度を40℃一定に保ちながら、湿度0%RHの乾燥窒素で40分間乾燥した後、40%RHで40分間加湿、さらに80%RHで40分間加湿し、40%RHから80%RH間の加湿によるチャック間距離の伸びから膨張率を求めた。
Claims (10)
- 前記ポリエステル樹脂(A)が1,2-ジカルボキシシクロヘキサンまたは1,2-ジカルボキシ-4-シクロヘキセンを含む二塩基酸と二価のアルコールとを反応させて得られるものである請求項1記載のセルロースエステル樹脂用改質剤。
- 前記二価のアルコールが炭素原子数2~4の脂肪族のアルコールである請求項2記載のセルロースエステル樹脂用改質剤。
- 前記二塩基酸が1,2-ジカルボキシシクロヘキサン、1,2-ジカルボキシ-4-シクロヘキセン以外の脂肪族二塩基酸を含む二塩基酸である請求項2記載のセルロースエステル樹脂用改質剤。
- 前記1,2-ジカルボキシシクロヘキサンまたは1,2-ジカルボキシ-4-シクロヘキセンの含有量が、二塩基酸の合計100質量部に対して5~100質量部である請求項2記載のセルロースエステル樹脂用改質剤。
- 前記ポリエステル樹脂(A)が1,2-ジカルボキシシクロヘキサンまたは1,2-ジカルボキシ-4-シクロヘキセンを含む二塩基酸と二価のアルコールとを反応させて樹脂の末端にカルボキシル基を含むポリエステル樹脂を得たのち、該ポリエステル樹脂とモノアルコールとを反応させて得られるものである請求項2記載のセルロースエステル樹脂用改質剤。
- 請求項1~6の何れか1項記載のセルロースエステル樹脂用改質剤とセルロースエステル樹脂とを含有してなることを特徴とするセルロースエステル光学フィルム。
- 前記セルロースエステル樹脂がトリアセチルセルロースである請求項7記載のセルロースエステル光学フィルム。
- 前記セルロースエステル樹脂100質量部に対して、前記セルロースエステル樹脂用改質剤を5~30質量部含んでなる請求項7記載のセルロースエステル光学フィルム。
- 請求項1~6の何れか一項に記載のセルロースエステル樹脂用改質剤とセルロースエステル樹脂とを有機溶剤に溶解して得られる樹脂溶液を、金属支持体上に流延させ、次いで前記有機溶剤を留去し乾燥させて得ることを特徴とする偏光板用保護フィルム。
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TWI619740B (zh) | 2018-04-01 |
JPWO2014027594A1 (ja) | 2016-07-25 |
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