WO2019003890A1 - 光学材料用樹脂組成物及び光学フィルム - Google Patents
光学材料用樹脂組成物及び光学フィルム Download PDFInfo
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- WO2019003890A1 WO2019003890A1 PCT/JP2018/022353 JP2018022353W WO2019003890A1 WO 2019003890 A1 WO2019003890 A1 WO 2019003890A1 JP 2018022353 W JP2018022353 W JP 2018022353W WO 2019003890 A1 WO2019003890 A1 WO 2019003890A1
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- 0 *C(OCC(COc(c(*)c1)c(*)cc1-c(cc1*)cc(*)c1OCC(COC(*)=O)O)O)=O Chemical compound *C(OCC(COc(c(*)c1)c(*)cc1-c(cc1*)cc(*)c1OCC(COC(*)=O)O)O)=O 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
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/12—Esters; Ether-esters of cyclic polycarboxylic acids
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
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- 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
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
Definitions
- the present invention relates to a resin composition for an optical material and an optical film.
- Acrylic resin films are applied to various optical members because of their excellent transparency and design.
- birefringence hardly appears even when stretching is performed, in recent years, it is widely used particularly for a polarizing plate protective film (inner) for IPS (In-Plane-Switching) liquid crystal.
- the required performance as a polarizing plate protective film for IPS liquid crystal includes high toughness / low moisture permeability / high heat resistance as the outermost surface film (outer), and zero retardation / high heat resistance as the inner film (inner).
- Be Acrylic resin manufacturers are aiming to develop and launch original special acrylic resins as well as general-purpose PMMA (Polymethyl methacrylate) resins (Patent Documents 1 and 2).
- composition of the resin composition for optical materials is made into the combination of an acrylic resin + cellulose resin, although heat resistance improves, an effect can not be confirmed about the improvement of an optical characteristic (patent document 3).
- composition of the resin composition for an optical material is a combination of an acrylic resin and a retardation control agent, although there is a certain effect in improving the optical characteristics, the problem is that the heat resistance is significantly lowered. (Patent Document 4).
- An object of the present invention is to provide an optical film having both excellent heat resistance and optical properties, and a resin composition for an optical material for producing the optical film.
- the present inventors maintain the heat resistance to some extent by making the composition of the resin composition for optical materials into a ternary blend system of acrylic resin + retardation control agent + cellulose resin, and more than each single blending. It has been found that the phase difference improvement effect is excellent. As a result, an optical film having both excellent heat resistance and optical properties, and a resin composition for an optical material for producing the optical film were successfully found.
- the present invention relates to the following (1) to (16).
- a resin composition for an optical material comprising (meth) acrylic resin (A), cellulose resin (B), and retardation control agent (C).
- the resin composition for an optical material according to (1) which comprises 0.5 to 20 parts by mass of a cellulose resin (B) with respect to 100 parts by mass of a (meth) acrylic resin (A).
- the resin for an optical material according to (1) or (2) which comprises 0.5 to 20 parts by mass of the retardation control agent (C) with respect to 100 parts by mass of the (meth) acrylic resin (A) Composition.
- a 1 and A 2 each independently represent an alkyl group having 1 to 8 carbon atoms or an aryl group having 6 to 18 carbon atoms.
- R 1 to R 4 each independently represent 1 to 6 carbon atoms
- X 1 and X 2 are each independently a divalent linking group.
- B 1 is each independently an aryl monocarboxylic acid residue having 6 to 18 carbon atoms or an aliphatic monocarboxylic acid residue having 1 to 8 carbon atoms
- B 2 is a fat having 1 to 12 carbon atoms
- G is an alkylene glycol residue having 2 to 12 carbon atoms or an oxyalkylene glycol residue having 4 to 12 carbon atoms
- A is an alkylene having 2 to 12 carbon atoms.
- the retardation control agent (C) has the following general formula (1-1-1)
- R 1 to R 4 each independently represent an alkyl group having 1 to 3 carbon atoms.
- Z represents an aromatic group (a1) or an aliphatic group (a2), respectively; a1) is a phenyl group or a paratoluyl group, and the aliphatic group (a2) is a methyl group) Or a compound represented by the formula (C-1), or the following general formulas (2) to (4)
- B 1 is each independently an aryl monocarboxylic acid residue having 6 to 18 carbon atoms or an aliphatic monocarboxylic acid residue having 1 to 8 carbon atoms
- B 2 is a fat having 1 to 12 carbon atoms
- G is an alkylene glycol residue having 2 to 12 carbon atoms or an oxyalkylene glycol residue having 4 to 12 carbon atoms
- A is an alkylene having 2 to 12 carbon atoms.
- the resin composition for optical materials according to any one of (1) to (6) which is a compound (C-2) represented by (10)
- the average abundance ratio of the aromatic group (a1) to the aliphatic group (a2) [(a1) / (a2)] is 99.9 / 0.1 to 80/20 in molar ratio, 9)
- (11) The resin composition for an optical material according to any one of (8) to (10), wherein A is an aryldicarboxylic acid residue having 6 to 18 carbon atoms.
- an optical film having good heat resistance and optical characteristics and an optical film having the same composition by forming the resin composition for optical material into a ternary blend system of acrylic resin + retardation control agent + cellulose resin
- the resin composition for optical materials for manufacturing a film can be provided.
- the (meth) acrylic resin (A) used in the present invention is preferably obtained using a methacrylic acid ester unit. Specifically, it is preferable that the polymer is obtained by using a methacrylic acid ester unit in combination with another polymerizable monomer as needed.
- the methacrylic acid ester include cyclohexyl methacrylate, t-butylcyclohexyl methacrylate, methyl methacrylate and the like.
- (meth) acrylic resins (A) used in the present invention a polymer obtained using methyl methacrylate is preferable because a film having excellent optical properties is obtained, and the economy is also excellent.
- Examples of the other polymerizable monomers include aromatic vinyl compounds such as styrene, vinyl toluene and ⁇ -methylstyrene; vinyl cyanides such as acrylonitrile and methacrylonitrile; N-phenyl maleimide, N-cyclohexyl Maleimides, such as maleimide, etc. are mentioned.
- the methacrylic acid ester unit is polymerized to obtain a polymer to be used as the (meth) acrylic resin (A), as another monomer, an optical film having excellent heat resistance and economical efficiency of an aromatic vinyl compound is obtained.
- styrene and ⁇ -methylstyrene are more preferable.
- the amount of the aromatic vinyl compounds used is preferably 1 to 50 parts by mass, and more preferably 2 to 30 parts by mass with respect to 100 parts by mass of the methacrylic acid ester.
- methacrylic acid ester for the (meth) acrylic resin (A) used in the present invention one may be used alone, or two or more may be used in combination. Moreover, also when using the said other monomer, you may use individually and may use 2 or more types together.
- the weight average molecular weight of the (meth) acrylic resin (A) used in the present invention is 50,000 to 200,000, and a molded article such as a strong optical film is obtained, and the flowability is sufficient, and molding This is preferable because a resin composition excellent in processability can be obtained, and 70,000 to 150,000 is more preferable.
- the number average molecular weight of the (meth) acrylic resin (A) used in the present invention is preferably 15,000 to 100,000, and more preferably 20,000 to 50,000.
- the weight average molecular weight (Mw) and the number average molecular weight (Mn) are values in terms of polystyrene based on gel permeation chromatography (GPC) measurement.
- the measurement conditions of GPC are as follows.
- the (meth) acrylic resin (A) used in the present invention for example, various polymerization methods such as cast polymerization, bulk polymerization, suspension polymerization, solution polymerization, emulsion polymerization, anion polymerization and the like may be used. It can. Among the production methods, bulk polymerization and solution polymerization are preferable because a polymer with little contamination of minute foreign matter can be obtained.
- solution polymerization a solution prepared by dissolving a mixture of raw materials in a solvent of aromatic hydrocarbon such as toluene and ethylbenzene can be used.
- polymerization by bulk polymerization polymerization can be initiated by irradiation of free radicals or ionizing radiation generated by heating as is commonly performed.
- any initiator generally used in radical polymerization can be used.
- azo compounds such as azobis isobutyl nitrile; benzoyl peroxide, lauroyl peroxide, t-butyl Organic peroxides such as peroxy-2-ethylhexanoate are used.
- a solution polymerization is generally used, so a 10-hour half-life temperature is 80 ° C. or higher and a peroxide which is soluble in the organic solvent used.
- azobis initiators are preferred.
- 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, cyclohexane peroxide, 2,5-dimethyl-2,5-di examples include benzoylperoxy) hexane, 1,1-azobis (1-cyclohexanecarbonitrile), 2- (carbamoylazo) isobutyronitrile and the like. These initiators are used in the range of 0.005 to 5% by mass.
- a molecular weight modifier may be used as needed.
- any one used in general radical polymerization is used, and for example, mercaptan compounds such as butyl mercaptan, octyl mercaptan, dodecyl mercaptan, 2-ethylhexyl thioglycolate and the like are mentioned as particularly preferable ones.
- mercaptan compounds such as butyl mercaptan, octyl mercaptan, dodecyl mercaptan, 2-ethylhexyl thioglycolate and the like are mentioned as particularly preferable ones.
- These molecular weight modifiers are added in a concentration range such that the degree of polymerization is controlled within the above range.
- the cellulose resin (B) used in the present invention preferably contains a cellulose ester.
- the cellulose ester is not particularly limited, and examples thereof include aromatic carboxylic acid esters, fatty acid esters of cellulose and the like, and lower fatty acid esters of cellulose (for example, fatty acid esters having 1 to 5 carbon atoms) are particularly preferable.
- fatty acid esters of cellulose include cellulose acetate, cellulose propionate, cellulose butyrate, cellulose pivalate, cellulose acetate acylate, cellulose mixed acid ester [eg, cellulose acetate such as cellulose acetate propionate, cellulose acetate butyrate, etc. etc. acylate (such as cellulose acetate C 3-5 acylate)] and the like.
- cellulose acetate C 3-5 acylate may be suitably used. One or more of these can be used.
- the number average molecular weight (Mn) of the cellulose resin (B) is preferably 50,000 to 150,000, more preferably 55,000 to 120,000, and still more preferably 60,000 to 100,000.
- the weight average molecular weight (Mw) / number average molecular weight (Mn) ratio of the cellulose resin (B) is preferably 1.3 to 5.5, more preferably 1.5 to 5.0, and 1.7 to 4.0 is more preferred, and 2.0 to 3.5 is most preferred.
- Mw and Mn are values calculated by polystyrene conversion by GPC. If it is these ranges, since compatibility with a (meth) acrylic resin is favorable and it is excellent also in flexibility, it is preferable.
- the degree of substitution of the cellulose resin (B) is not particularly limited, but may be, for example, about 2 to 3.
- the degree of acetyl substitution is, for example, 0.1 to 2.0, preferably 0.1 to 1.0.
- the degree of acyl substitution (for example, the degree of C 3-5 acyl group substitution) is, for example, 1.0 to 2.9, and preferably 2.0 to 2.9. In this case, the compatibility with the (meth) acrylic resin (A) is good.
- the content of the cellulose resin (B) in the resin composition for an optical material of the present invention is preferably 0.5 to 20 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin, and 1 to 15 More preferably, it is 2 to 10 parts by mass.
- the retardation control agent used in the present invention has the following general formula (1)
- a 1 and A 2 each independently represent an alkyl group having 1 to 8 carbon atoms or an aryl group having 6 to 18 carbon atoms.
- R 1 to R 4 each independently represent 1 to 6 carbon atoms
- X 1 and X 2 are each independently a divalent linking group.
- B 1 is each independently an aryl monocarboxylic acid residue having 6 to 18 carbon atoms or an aliphatic monocarboxylic acid residue having 1 to 8 carbon atoms
- B 2 is a fat having 1 to 12 carbon atoms
- G is an alkylene glycol residue having 2 to 12 carbon atoms or an oxyalkylene glycol residue having 4 to 12 carbon atoms
- A is an alkylene having 2 to 12 carbon atoms.
- a compound represented by the formula a compound represented by Ar 1 -L 1 -Ar 2 , (Wherein, Ar 1 and Ar 2 are each independently an aromatic group, and L 1 is selected from the group consisting of an alkylene group, an alkenylene group, an alkynylene group, -O-, -CO-, and a combination thereof Or a compound represented by the following formula
- A represents a pyrazole ring
- Ar 1 and Ar 2 each represent an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and may have a substituent.
- R 1 represents a hydrogen atom, an alkyl group, or an acyl
- Group represents a group, a sulfonyl group, an alkyloxycarbonyl group or an aryloxycarbonyl group
- q represents an integer of 1 to 2
- n and m each represent an integer of 1 to 3).
- Ar 1 -L 1 -Ar 2 Ar 1 and Ar 2 are each independently an aromatic group.
- the aromatic group includes an aryl group (aromatic hydrocarbon group), a substituted aryl group, an aromatic heterocyclic group and a substituted aromatic heterocyclic group.
- aryl groups and substituted aryl groups are preferred.
- the aromatic ring of the aryl group is preferably a 5-, 6- or 7-membered ring, and more preferably a 5- or 6-membered ring. These aromatic rings may be single or two or more may be linked.
- aromatic rings may be single or two or more may be linked.
- benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, indene ring, biphenyl, terphenyl and the like can be mentioned.
- a benzene ring is particularly preferred.
- the heterocycle of the aromatic heterocyclic group is generally unsaturated.
- the aromatic heterocycle is preferably a 5-, 6- or 7-membered ring, more preferably a 5- or 6-membered ring.
- Aromatic hetero rings generally have the largest number of double bonds.
- the hetero atom is preferably a nitrogen atom, an oxygen atom or a sulfur atom, more preferably a nitrogen atom or a sulfur atom.
- aromatic heterocyclic ring examples include furan ring, thiophene ring, pyrrole ring, oxazole ring, isoxazole ring, thiazole ring, isothiazole ring, imidazole ring, pyrazole ring, furazan ring, triazole ring, pyran ring, pyridine Included are rings, pyridazine rings, pyrimidine rings, pyrazine rings, and 1,3,5-triazine rings.
- aromatic ring of the aromatic group benzene ring, furan ring, thiophene ring, pyrrole ring, oxazole ring, thiazole ring, imidazole ring, triazole ring, pyridine ring, pyrimidine ring and pyrazine ring are preferable, and benzene ring is particularly preferable. .
- substituent of the substituted aryl group and the substituted aromatic heterocyclic group include a halogen atom (F, Cl, Br, I), hydroxyl, carboxyl, cyano, amino, alkylamino group (eg, methylamino, ethylamino) , Butylamino, dimethylamino), nitro, sulfo, carbamoyl, alkylcarbamoyl group (eg, N-methylcarbamoyl, N-ethylcarbamoyl, N, N-dimethylcarbamoyl), sulfamoyl, alkylsulfamoyl group (eg, N- Methylsulfamoyl, N-ethylsulfamoyl, N, N-dimethylsulfamoyl), ureide, alkylureido group (eg, N-methylureide, N, N-dimethylurei
- a halogen atom, cyano, carboxyl, hydroxyl, amino, alkyl substituted amino group, acyl group, acyloxy group, amide group, alkoxycarbonyl group, alkoxy group, alkylthio group Groups and alkyl groups are preferred.
- the alkyl moiety of the alkylamino group, the alkoxycarbonyl group, the alkoxy group and the alkylthio group and the alkyl group may further have a substituent.
- alkyl moiety and the substituent of the alkyl group include a halogen atom, hydroxyl, carboxyl, cyano, amino, alkylamino group, nitro, sulfo, carbamoyl, alkylcarbamoyl group, sulfamoyl, alkylsulfamoyl group, ureido, alkylureido Group, alkenyl group, alkynyl group, acyl group, acyloxy group, alkoxy group, aryloxy group, alkoxycarbonyl group, alkoxycarbonyl group, aryloxycarbonyl group, alkoxycarbonylamino group, alkylthio group, arylthio group, alkylsulfonyl group, amide group and non-aromatic group Group heterocyclic groups are included.
- a halogen atom hydroxyl, amino, an alkylamino group, an acyl group, an acyloxy group, an acylamino group, an alkoxycarbonyl group and an alkoxy group are preferable.
- L 1 is a divalent linking group selected from the group consisting of an alkylene group, an alkenylene group, an alkynylene group, -O-, -CO- and a combination thereof .
- the alkylene group may have a cyclic structure.
- cyclic alkylene group cyclohexylene is preferable, and 1,4-cyclohexylene is particularly preferable.
- chain alkylene group a linear alkylene group is preferred to a branched alkylene group.
- the number of carbon atoms of the alkylene group is preferably 1 to 20, more preferably 1 to 15, still more preferably 1 to 10, particularly preferably 1 to 8, and 1 to 6 It is most preferable that
- the alkenylene group and the alkynylene group preferably have a chain structure rather than a cyclic structure, and more preferably have a linear structure rather than a branched chain structure.
- the number of carbon atoms of the alkenylene group and the alkynylene group is preferably 2 to 10, more preferably 2 to 8, still more preferably 2 to 6, and particularly preferably 2 to 4. Most preferably, it is 2 (vinylene or ethynylene).
- the angle formed by Ar 1 and Ar 2 across L 1 is preferably 140 ° or more.
- a compound represented by the general formula Ar 1 -L 2 -XL 3 -Ar 2 is more preferable.
- Ar 1 and Ar 2 are each independently an aromatic group.
- the definition and examples of the aromatic group are the same as Ar 1 and Ar 2 of the general formula Ar 1 -L 1 -Ar 2 .
- L 2 and L 3 each independently represent a divalent selected from the group consisting of an alkylene group, -O-, -CO- and a combination thereof It is a linking group.
- the alkylene group preferably has a chain structure rather than a cyclic structure, and more preferably a linear structure rather than a branched chain structure.
- the number of carbon atoms of the alkylene group is preferably 1 to 10, more preferably 1 to 8, still more preferably 1 to 6, particularly preferably 1 to 4, 1 or 2 Most preferably (methylene or ethylene).
- L 2 and L 3 are particularly preferably —O—CO— or —CO—O—.
- X is 1,4-cyclohexylene, vinylene or ethynylene.
- Specific examples of the compound represented by the general formula Ar 1 -L 1 -Ar 2 are shown below.
- aromatic hydrocarbon ring or aromatic heterocycle represented by Ar 1 and Ar 2 there are no limitations on the structure of the aromatic hydrocarbon ring or aromatic heterocycle represented by Ar 1 and Ar 2 in the following, for example, benzene ring, pyrrole ring, pyrazole ring, imidazole ring, 1,2,3-triazole ring 1,2,4-triazole ring, tetrazole ring, furan ring, oxazole ring, isoxazole ring, oxadiazole ring, isoxadiazole ring, thiophene ring, thiazole ring, isothiazole ring, thiadiazole ring, isothiadiazole ring Etc.
- substituents examples include a halogen atom (a fluorine atom, a chlorine atom, a bromine atom, an iodine atom etc.), an alkyl group (a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an tert-butyl group, n- Octyl group, 2-ethylhexyl group etc., cycloalkyl group (cyclohexyl group, cyclopentyl group, 4-n-dodecylcyclohexyl group etc.), alkenyl group (vinyl group, allyl group etc.), cycloalkenyl group (2-cyclopentene-1) -Yl, 2-cyclohexen-1-yl group etc.), alkynyl group (ethynyl group, propargyl group etc.), aromatic hydrocarbon ring group (phenyl group, p-tolyl
- R 1 examples include a halogen atom (fluorine atom, chlorine atom, bromine atom, iodine atom etc.), an alkyl group (methyl group, ethyl group, n-propyl group, isopropyl group, tert-butyl group, n-octyl group) Group, 2-ethylhexyl group, etc., acyl group (eg, acetyl group, pivaloylbenzoyl group, etc.), sulfonyl group (eg, methylsulfonyl group, ethylsulfonyl group etc.), alkyloxycarbonyl group (eg, methoxycarbonyl group), And aryloxycarbonyl groups (eg, phenoxycarbonyl group etc.) and the like.
- halogen atom fluorine atom, chlorine atom, bromine atom, iodine atom etc.
- an alkyl group
- a 1 and A 2 each independently represent an alkyl group having 1 to 8 carbon atoms or an aryl group having 6 to 18 carbon atoms.
- R 1 to R 4 each independently represent 1 to 6 carbon atoms
- X 1 and X 2 are each independently a divalent linking group.
- B 1 is each independently an aryl monocarboxylic acid residue having 6 to 18 carbon atoms or an aliphatic monocarboxylic acid residue having 1 to 8 carbon atoms
- B 2 is a fat having 1 to 12 carbon atoms
- G is an alkylene glycol residue having 2 to 12 carbon atoms or an oxyalkylene glycol residue having 4 to 12 carbon atoms
- A is an alkylene having 2 to 12 carbon atoms.
- It is a dicarboxylic acid residue or an aryldicarboxylic acid residue having 6 to 18 carbon atoms, and l, m and n each represent a repeating number of 1 to 6.
- the compound represented by is preferable.
- L 1 and L 2 each independently represent an alkyl group having 1 to 8 carbon atoms or an aryl group having 6 to 18 carbon atoms.
- R 1 to R 4 each independently represent 1 to 6 carbon atoms It is an alkyl group of 3.
- R 1 to R 4 each independently represent an alkyl group having 1 to 3 carbon atoms.
- Z represents an aromatic group (a1) or an aliphatic group (a2), respectively; a1) is a phenyl group or a paratoluyl group, and the aliphatic group (a2) is a methyl group
- the resin composition is excellent in stability such as storage stability.
- the average abundance ratio of the aromatic group (a1) to the aliphatic group (a2) [(a1) / (a2)] is preferably 99.9 / 0.1 to 80/20 in molar ratio .
- Z in the compounds (C-1) (including a biphenol skeleton) used in the present invention may be the same or different.
- the compound represented by the above general formula (1-1-1) can be obtained, for example, by reacting an epoxy compound having a biphenyl skeleton with acetic acid, benzoic acid and / or paratoluic acid.
- Examples of the epoxy compound having a biphenyl skeleton include diglycidyl ether type epoxy compounds obtained by the reaction of biphenols and epichlorohydrin.
- diglycidyl ether type epoxy compounds obtained by the reaction of biphenols and epichlorohydrin.
- this epoxy compound 3,3 ', 5,5'-tetramethyl-4,4'-diglycidyl oxybiphenyl (commercially available product "jER YX-4000" manufactured by Mitsubishi Chemical Corporation Biphenol type epoxy compounds such as equivalents 180 to 192) can be used.
- a catalyst may be used if necessary.
- phosphine compounds such as trimethyl phosphine, triethyl phosphine, tributyl phosphine, trioctyl phosphine, triphenyl phosphine and the like; 2-methylimidazole, 2-ethylimidazole, 2-isopropylimidazole, 2-ethyl-4-methyl Imidazole, imidazole compounds such as 4-phenyl-2-methylimidazole; triethylamine, tributylamine, trihexylamine, triamylamine, triethanolamine, dimethylaminoethanol, triacetylene diamine, dimethylphenylamine, dimethylbenzylamine, 2 Amine compounds such as-(dimethylaminomethyl) phenol and 1,8
- each of R 1 to R 4 is a (meth) acrylic group having a methyl group. It is preferable from becoming a compound which is excellent in compatibility with resin (A).
- the properties of the compounds represented by the above general formulas (1), (1-1) and (1-2) used in the present invention and the properties of the compound (C-1) differ depending on factors such as the composition, etc. Liquid, solid, and paste-like.
- the content of the compound represented by the general formulas (1), (1-1), (1-2) and the compound (C-1) in the resin composition for optical materials of the present invention is used ((1) although it depends on the heat resistance and the magnitude of retardation of the (meth) acrylic resin (A), 100 parts by mass of the (meth) acrylic resin from the viewpoint of achieving both heat resistance of the resin composition and retardation control.
- the amount is preferably 0.5 to 20 parts by mass, more preferably 1 to 15 parts by mass, and still more preferably 2 to 8 parts by mass.
- the compounds (C-2) represented by the following general formulas (2) to (4) are also more preferable.
- B 1 is each independently an aryl monocarboxylic acid residue having 6 to 18 carbon atoms or an aliphatic monocarboxylic acid residue having 1 to 8 carbon atoms
- B 2 is a fat having 1 to 12 carbon atoms
- G is an alkylene glycol residue having 2 to 12 carbon atoms or an oxyalkylene glycol residue having 4 to 12 carbon atoms
- A is an alkylene having 2 to 12 carbon atoms. It is a dicarboxylic acid residue or an aryldicarboxylic acid residue having 6 to 18 carbon atoms, and l, m and n each represent a repeating number of 1 to 6.
- the content of the compound (C-2) in the resin composition for optical materials of the present invention is preferably 0.5 to 20 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin (A) to be used 1 to 15 parts by mass is more preferable, and 2 to 10 parts by mass is more preferable.
- the compound represented by the general formula (2) can be obtained, for example, by reacting dimethyl terephthalate with propylene glycol.
- a catalyst may be used as needed.
- this catalyst include tetraisopropoxytitanium, tetraisopropyl titanate, and zinc acetate.
- the optical film of the present invention is characterized by containing the resin composition for an optical material of the present invention.
- the optical film of the present invention is characterized in that the heat resistance of the film is good and the retardation of the film can be adjusted to any size. Since the optical film of the present invention is excellent in the stability to heat, the dimensional change to heat is small, and hence the rate of change of birefringence is small. Further, since the phase difference can be adjusted to an arbitrary value, various liquid crystal display devices can be provided.
- the resin composition for an optical material of the present invention can be used for the production of various optical moldings.
- the resin composition for an optical material of the present invention can be used to produce a film-like molded product (optical film).
- an optical film stretched at least in a uniaxial direction and having an absolute value of retardation of 4 (nm) or less can be particularly suitably used as a polarizing plate protective film for IPS liquid crystal.
- the retardation film an optical film having an absolute value of retardation of 2 (nm) or less is preferable, and an optical film having an absolute value of retardation of 1 (nm) or less is more preferable.
- a retardation film having a large birefringence can also be obtained by appropriately adjusting the amounts of the retardation control agent and the cellulose resin, and the draw ratio in the TD direction and the MD direction.
- Polymers other than the (meth) acrylic resin (A) and the cellulose resin (B) can be mixed with the resin composition for an optical material of the present invention as long as the object of the present invention is not impaired.
- Examples of polymers other than the (meth) acrylic resin (A) and the cellulose resin (B) include polyolefins such as polyethylene and polypropylene; styrene resins such as polystyrene and styrene acrylonitrile copolymer; polyamide, polyphenylene sulfide resin, Thermoplastic resins such as polyetheretherketone resin, polyester resin, polysulfone, polyphenylene oxide, polyimide, polyetherimide, polyacetal and the like; and thermosetting resins such as phenol resin, melamine resin, silicone resin, epoxy resin and the like. One of these may be mixed, or two or more may be mixed.
- any additive can be blended according to various purposes within the range that the effect of the present invention is not significantly impaired.
- the type of the additive is not particularly limited as long as it is generally used for blending of resin and rubbery polymer.
- Additives include, for example, inorganic fillers, pigments such as iron oxide; stearic acid, behenic acid, zinc stearate, calcium stearate, magnesium stearate, lubricants such as ethylene bis stearoamide, etc.
- paraffin process Softeners and plasticizers such as oils, naphthenic process oils, aromatic process oils, paraffins, organic polysiloxanes, and mineral oils; Hindered phenolic antioxidants, phosphorus thermal stabilizers, lactone thermal stabilizers, vitamins Antioxidants such as E type heat stabilizers; Light stabilizers such as hindered amine type light stabilizers, benzoate type light stabilizers; UV absorption such as benzophenone type UV absorbers, triazine type UV absorbers, benzotriazole type UV absorbers Flame retardants; Antistatic agents; Organic fibers, glass fibers, carbon fibers, metals Reinforcing agents such as Isuka; coloring agents, other additives, or mixtures thereof.
- paraffin process Softeners and plasticizers such as oils, naphthenic process oils, aromatic process oils, paraffins, organic polysiloxanes, and mineral oils
- Hindered phenolic antioxidants, phosphorus thermal stabilizers, lactone thermal stabilizers, vitamins Antioxidants
- the resin composition for an optical material of the present invention preferably contains, for example, the (meth) acrylic resin (A), the cellulose resin (B) and the compound (C-1) or (C-2),
- the manufacturing method is not particularly limited. Specifically, for example, a single screw extruder for the (meth) acrylic resin (A), the cellulose resin (B) and the compound (C-1) or (C-2) and, if necessary, the above additive, It can obtain by the method of melt-kneading using melt kneaders, such as a twin-screw extruder, a Banbury mixer, Brabender, various kneaders.
- melt kneaders such as a twin-screw extruder, a Banbury mixer, Brabender, various kneaders.
- the optical film of the present invention is characterized by containing the resin composition for an optical material of the present invention.
- methods such as extrusion molding and cast molding are used to obtain the optical film of the present invention.
- an unstretched optical film can be extruded using an extruder or the like equipped with a T-die, a circular die or the like.
- the present invention is obtained by melt-kneading the (meth) acrylic resin (A), the cellulose resin (B) and the retardation control agent (C) in advance.
- the solution casting method is described in detail below.
- the optical film obtained by the solution casting method exhibits substantially optical isotropy.
- the film exhibiting optical isotropy can be used, for example, for an optical material such as a liquid crystal display, and is particularly useful as a protective film for a polarizing plate.
- corrugation is hard to be formed in the surface, and it is excellent in surface smoothness.
- the (meth) acrylic resin (A), the cellulose resin (B) and the retardation control agent (C) are dissolved in an organic solvent, and the obtained resin solution is used as a metal
- the metal support used in the first step may be, for example, an endless belt-like or drum-like metal support, and for example, a stainless steel support whose surface is mirror-finished can be used. .
- the drying method in the second step is not particularly limited, but it is contained in the cast resin solution cast by applying wind of a temperature range of, for example, 30 to 50 ° C. to the upper surface and / or the lower surface of the metal support.
- the method includes evaporating 50 to 80% by mass of the organic solvent to form a film on the metal support.
- the third step is a step of peeling the film formed in the second step from the metal support and heating and drying under the temperature condition higher than that of the second step.
- the heating and drying method for example, a method in which the temperature is raised stepwise at a temperature condition of 100 to 160 ° C. is preferable because good dimensional stability can be obtained. By heating and drying under the above temperature conditions, the organic solvent remaining in the film after the second step can be almost completely removed.
- the organic solvent can be recovered and reused.
- organic solvent which can be used when mixing and dissolving the (meth) acrylic resin (A), the cellulose resin (B) and the retardation control agent (C) in an organic solvent
- solvents such as chloroform, methylene dichloride and methylene chloride can be mentioned without particular limitation.
- the concentration of the (meth) acrylic resin (A) in the resin solution is preferably 10 to 50% by mass, and more preferably 15 to 35% by mass.
- the thickness of the optical film of the present invention 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.
- the unstretched optical film obtained by the above method is longitudinally uniaxially stretched in the mechanical flow direction and transverse uniaxial stretching in the direction orthogonal to the mechanical flow direction.
- a biaxially stretched stretched film can be obtained by stretching by a sequential biaxial stretching method of roll stretching and tenter stretching, a simultaneous biaxial stretching method by tenter stretching, a biaxial stretching method by tubular stretching, or the like.
- the stretching ratio is preferably 0.1% to 1000% in at least one direction, more preferably 0.2% to 600%, and 0.3% to 300%. Especially preferred. By designing in this range, a stretched optical film preferable in terms of birefringence, heat resistance and strength can be obtained.
- the optical film according to the present invention is a polarizing plate protective film for use in a display such as a liquid crystal display, plasma display, organic EL display, field emission display, rear projection television, etc. It can be suitably used as a wave plate, a viewing angle control film, a retardation film such as a liquid crystal optical compensation film, a display front plate or the like.
- the resin composition for optical materials of the present invention is also applicable to waveguides, lenses, optical fibers, optical fiber substrates, coating materials, LED lenses in the fields of optical communication systems, optical exchange systems, and optical measurement systems. , Lens cover etc.
- HAZE value of the 40 mm square test piece was measured with a HAZE meter NDH-5000 (manufactured by Nippon Denshoku Kogyo Co., Ltd.). The smaller the obtained haze value, the better the transparency.
- D infrared dichroic ratio (absorbance (0 °) / absorbance (90 °))
- D 0 Infrared dichroic ratio in perfect alignment
- 2 cot 2 ( ⁇ ) ⁇ bond (transition) moment angle to molecular chain axis
- the unstretched optical film obtained by the solution casting method is used as an example of the optical film of the present invention, and this optical film is cut out with a width of 20 mm in the stretching direction to obtain a measurement sample.
- the measurement sample is fixed to a photoelastic coefficient measurement instrument (manufactured by Uniopt Corporation), and the weight when pulling the measurement sample is changed from 0 to 10N.
- Each in-plane phase difference at the time of applying each weight is measured.
- the measurement conditions are 23 ° C. under an atmosphere of 55% relative humidity.
- the photoelastic coefficient (C G ) can be obtained by using the following conversion equation.
- C G [ ⁇ 10 -12 Pa -1 ] ⁇ ⁇ L / 9.8 ⁇ 10 -9 (L: Width of specimen [mm], ⁇ : inclination of straight line)
- ester compound (C-2-7) which is a normal temperature high viscosity liquid.
- the acid value of this compound was 0.2
- the hydroxyl value was 240
- the number average molecular weight (Mn) was 550.
- Example 1 270 parts by mass of methylene chloride, 30 parts by mass of methanol and 100 parts by mass of (meth) acrylic resin A (PMMA based acrylic resin manufactured by Mitsubishi Chemical; Acrypet V) 5 parts by mass) and 10 parts by mass of a cellulose resin (cellulose acetate propionate; CAP) were added and dissolved to obtain a dope solution.
- the dope solution was cast on a glass plate and the solvent was distilled off (dried) to obtain a film having a film thickness of about 60 ⁇ m.
- the transparency and heat resistance of the obtained film were evaluated according to the above-mentioned method. The evaluation results are shown in Table 1. Moreover, the heat
- Examples 2 to 32 The number and type of retardation control agents and the number of cellulose resin additions were blended as described in the table to obtain a film in the same manner as in Example 1. Evaluation was performed in the same manner as in Example 1. The results are shown in Tables 1 to 8.
- Examples 33 to 64 A film was obtained and evaluated in the same manner as in Example 1 except that CAB (cellulose acetate butyrate) was used in place of CAP in Example 1. The results are shown in Tables 9-16.
- Comparative Examples 2 to 23 The number and type of retardation control agents and the number of cellulose resin additions were blended as described in the table to obtain a film in the same manner as in Comparative Example 1. Evaluation was performed in the same manner as Comparative Example 1. The results are shown in Tables 17-22.
- the improvement of retardation by the ternary combination system of (meth) acrylic resin / retardation control agent / cellulose resin is because the degree of orientation of the retardation control agent in the film composition is high. It is presumed that it plays a role as an "orientation aid" promoting the orientation of
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Abstract
Description
(1)(メタ)アクリル樹脂(A)と、セルロース樹脂(B)と、位相差制御剤(C)とを含有することを特徴とする、光学材料用樹脂組成物。
(2)(メタ)アクリル樹脂(A)100質量部に対して、セルロース樹脂(B)を0.5~20質量部含有する、(1)に記載の光学材料用樹脂組成物。
(3)(メタ)アクリル樹脂(A)100質量部に対して、位相差制御剤(C)を0.5~20質量部含有する、(1)または(2)に記載の光学材料用樹脂組成物。
(4)(メタ)アクリル樹脂(A)が、メタクリル酸エステル単位を重合単位として含む、(1)から(3)のいずれか一項に記載の光学材料用樹脂組成物。
(5)セルロース樹脂(B)が、セルロースエステルを含有する、(1)から(4)のいずれか一項に記載の光学材料用樹脂組成物。
(6)セルロースエステルが、セルロースアセテートプロピオネートである、(5)に記載の光学材料用樹脂組成物。
(7)位相差制御剤(C)が、エステル系位相差制御剤である、(1)から(6)のいずれか一項に記載の光学材料用樹脂組成物。
(8)位相差制御剤(C)が、下記一般式(1)
で表される化合物、下記一般式(2)~(4)、
で表される化合物である、(1)から(6)のいずれか一項に記載の光学材料用樹脂組成物。
(9)位相差制御剤(C)が、下記一般式(1-1-1)
で表される化合物(C-1)、又は下記一般式(2)~(4)
で表される化合物(C-2)である、(1)から(6)のいずれか一項に記載の光学材料用樹脂組成物。
(10)芳香族基(a1)と脂肪族基(a2)の平均の存在比〔(a1)/(a2)〕は、モル比で99.9/0.1~80/20である、(9)に記載の光学材料用樹脂組成物。
(11)前記Aが炭素数6~18のアリールジカルボン酸残基である、(8)から(10)のいずれか一項に記載の光学材料用樹脂組成物。
(12)前記R1~R4がそれぞれメチル基である、(8)から(11)のいずれか一項に記載の光学材料用樹脂組成物。
(13)前記(メタ)アクリル樹脂(A)がメタクリル酸メチルを用いて得られたものである、(1)から(12)のいずれか一項に記載の光学材料用樹脂組成物。
(14)(1)から(13)のいずれか一項に記載の光学材料用樹脂組成物を含有することを特徴とする光学フィルム。
(15)偏光板保護用である(14)に記載の光学フィルム。
(16)(14)または(15)に記載の光学フィルムを有することを特徴とする液晶表示装置。
[(メタ)アクリル樹脂(A)]
本発明で用いられる(メタ)アクリル樹脂(A)は、メタクリル酸エステル単位を用いて得られることが好ましい。具体的には、メタクリル酸エステル単位と必要に応じて他の重合性単量体を併用して重合させて得られることが好ましい。前記メタクリル酸エステルとしては、例えば、メタクリル酸シクロヘキシル、メタクリル酸t-ブチルシクロヘキシル、メタクリル酸メチル等が挙げられる。
測定装置:東ソー株式会社製高速GPC装置「HLC-8320GPC」
カラム:東ソー株式会社製「TSK GURDCOLUMN SuperHZ-L」+東ソー株式会社製「TSK gel SuperHZM-M」+東ソー株式会社製「TSK gel SuperHZM-M」+東ソー株式会社製「TSK gel SuperHZ-2000」+東ソー株式会社製「TSK gel SuperHZ-2000」
検出器:RI(示差屈折計)
データ処理:東ソー株式会社製「EcoSEC Data Analysis バージョン1.07」
カラム温度:40℃
展開溶媒:テトラヒドロフラン
流速:0.35mL/分
測定試料:試料7.5mgを10mlのテトラヒドロフランに溶解し、得られた溶液をマイクロフィルターでろ過したものを測定試料とした。
試料注入量:20μl
標準試料:前記「HLC-8320GPC」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-300」
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」
本発明で用いられるセルロース樹脂(B)は、セルロースエステルを含有していることが好ましい。
本発明で用いられる位相差制御剤は、下記一般式(1)
で表される化合物、下記一般式(2)~(4)
で表される化合物、または欧州特許911,6556A2号明細書に記載されているような、2以上の芳香族環を有する芳香族化合物、特開2006-2025号公報に記載の棒状化合物、特開2017-72775号公報に記載のピラゾール系化合物であることが好ましい。すなわち、上記の一般式(1)~(4)で表される化合物の他、以下の式
で表される化合物、Ar1-L1-Ar2で表される化合物、
(式中、Ar1及びAr2は、それぞれ独立に、芳香族基であり、L1は、アルキレン基、アルケニレン基、アルキニレン基、-O-、-CO-及びそれらの組み合わせからなる群より選ばれる2価の連結基である)または以下の式で表される化合物
L-1:-O-CO-アルキレン基-CO-O-
L-2:-CO-O-アルキレン基-O-CO-
L-3:-O-CO-アルケニレン基-CO-O-
L-4:-CO-O-アルケニレン基-O-CO-
L-5:-O-CO-アルキニレン基-CO-O-
L-6:-CO-O-アルキニレン基-O-CO-
で表される化合物、下記一般式(2)~(4)
で表される化合物が好ましい。
で表される化合物(C-1)であることがより好ましい。この化合物は、上記の式(1-1-1)で示されるように、ビフェノール骨格を含む。ビフェニル骨格を有することにより(メタ)アクリル樹脂の位相差を正の方向へ大きくするという効果が期待できる。また、末端が前記Zで封止されていることにより、保存安定性等の安定性に優れた樹脂組成物となる。また、芳香族基(a1)と脂肪族基(a2)の平均の存在比〔(a1)/(a2)〕は、モル比で99.9/0.1~80/20であることが好ましい。
本発明の光学フィルムは、前記本発明の光学材料用樹脂組成物を含有することを特徴とする。本発明の光学フィルムは、フィルムの耐熱性が良好であり、フィルムの位相差を任意の大きさに調整が可能である特徴を有する。本発明の光学フィルムは熱に対する安定性に優れるため、熱に対する寸法変化が小さく、それゆえに複屈折の変化率が小さい。また、位相差を任意の値に調整することができるため、種々の液晶表示装置を提供することができる。
分子量は、テトラヒドロフラン(THF)溶媒を用い、示差屈折検出によるゲルパーミエージョンクロマトグラフィー(GPC)により行った。
23℃かつ相対湿度55%で2時間以上静置し,複屈折測定装置(KOBRA-WR,王子計測器(株)製)を用いて波長590nmにおける面内位相差(Re値),面外位相差(Rth値)を測定した。
40mm角の試験片をHAZEメーターNDH-5000(日本電色工業製)にて、HAZE値の測定を行った。得られたHAZE値が小さいほど、透明性に優れることを示す。
動的粘弾性測定装置により、測定したtanδのピークトップ値における温度をTgと定義し、その大きさを評価した。
55mm角の試験片を井元製作所(製)の二軸延伸機を用いて、下記条件にて熱延伸を行った。
・倍率:1.5倍、速度:50%/min、温度:(DMA測定のtanδピークトップを与える温度)-12 ℃
<フィルム中の添加剤の配向度の算出方法>
円二色性赤外偏光分光測定装置(Nicolet iS10;サーモフィッシャー製)を用いて、フィルム組成物中の位相差制御剤の特定ピークについて、延伸方向に対して平行方向(0°)と垂直方向(90°)の吸光度を測定し、以下の定義式を用いて位相差制御剤の配向度を算出した。
本発明の光学フィルムの一例として溶液キャスト法で得られた未延伸光学フィルムを用い、この光学フィルムを延伸方向に幅20mmで切り抜き、測定サンプルを得る。この測定サンプルを光弾性係数測定機器(ユニオプト社製)に固定し、0~10Nまで測定サンプルを引っ張る際の加重を変化させる。各々の加重をかけた際の面内位相差をそれぞれ測定する。測定条件は23℃、相対湿度55%雰囲気下で行う。かけた加重に対して測定された位相差をプロットし、得られたグラフの傾き(Δ)から、下記の換算式を用いることで光弾性係数(CG)が得られる。
CG[×10-12Pa-1]=Δ×L/9.8×10-9
(L:試片の幅[mm]、Δ:直線の傾き)
温度計、攪拌機、及び還流冷却器を付した内容量3Lの四つ口フラスコに、テレフタル酸メチルを463gと、安息香酸を648gと、プロピレングリコールを410gと、テトライソプロポキシチタンを0.091gとを仕込んだ後、窒素気流下で攪拌しながら、220℃になるまで段階的に昇温し、合計17時間縮合反応させた。反応後に未反応のプロピレングリコールを減圧除去することで、常温高粘度液体であるエステル化合物(C-2-1)を得た。この化合物の酸価は0.1、水酸基価は8、数平均分子量(Mn)は430であった。
温度計、攪拌器、及び還流冷却器を付した内容積3リットルの四つ口フラスコに、テレフタル酸ジメチルを554g、プロピレングリコールを476g、パラトルイル酸を817g、エステル化触媒としてテトライソプロピルチタネートを0.13gを仕込み、窒素気流下で攪拌しながら、220℃になるまで段階的に昇温し、計19時間縮合反応させた。反応後に未反応のプロピレングリコールを減圧除去することで、常温高粘度液体であるエステル化合物(C-2-2)を得た。この化合物の酸価は0.2、水酸基価は11、数平均分子量(Mn)は500であった。
温度計、攪拌器、及び還流冷却器を付した内容積2リットルの四つ口フラスコに、2,6-ナフタレンジカルボン酸ジメチルを733g、プロピレングリコールを685g、エステル化触媒として酢酸亜鉛を0.09g仕込み、窒素気流下で攪拌しながら、210℃になるまで段階的に昇温し、合計20時間縮合反応させた。反応後に未反応のプロピレングリコールを減圧除去することで、常温高粘度液体であるエステル化合物(C-2-3)を得た。この化合物の酸価は0.3、水酸基価は184、数平均分子量(Mn)は640であった。
温度計、攪拌器、及び還流冷却器を付した内容積1リットルの四つ口フラスコに、2,6-ナフタレンジカルボン酸を973g、テレフタル酸を83g、プロピレングリコールを496g、トリエチレングリコールを109g、エステル化触媒として酢酸亜鉛を0.10g仕込み、窒素気流下で攪拌しながら、210℃になるまで段階的に昇温し、合計20時間縮合反応させた。反応後に未反応のグリコール成分を減圧除去することで、常温高粘度液体であるエステル化合物(C-2-4)を得た。この化合物の酸価は0.2、水酸基価は65、数平均分子量(Mn)は910であった。
温度計、攪拌機、及び還流冷却器を付した内容量2Lの四つ口フラスコに、テレフタル酸ジメチルを699gと、安息香酸を293gと、プロピレングリコールを416gと、テトライソプロポキシチタンを0.09gとを仕込んだ後、窒素気流下で攪拌しながら、220℃になるまで段階的に昇温し、合計17時間縮合反応させた。反応後に未反応のプロピレングリコールを減圧除去することで、常温高粘度液体であるエステル化合物(C-2-5)を得た。この化合物の酸価は0.1、水酸基価は12、数平均分子量(Mn)は790であった。
温度計、攪拌器、及び還流冷却器を付した内容積3リットルの四つ口フラスコに、テレフタル酸ジメチルを971g、プロピレングリコールを1141g、エステル化触媒としてテトライソプロピルチタネートを0.13gを仕込み、窒素気流下で攪拌しながら、190℃になるまで段階的に昇温し、計15時間縮合反応させた。反応後に未反応のプロピレングリコールを減圧除去することで、常温高粘度液体であるエステル化合物(C-2-6)を得た。この化合物の酸価は0.1、水酸基価は270、数平均分子量(Mn)は500であった。
温度計、攪拌器、及び還流冷却器を付した内容積0.5リットルの四つ口フラスコに、テレフタル酸ジメチルを87g、4,4’-ビフェニルジカルボン酸ジメチルを122gプロピレングリコールを205g、エステル化触媒としてテトライソプロピルチタネートを0.03gを仕込み、窒素気流下で攪拌しながら、200℃になるまで段階的に昇温し、計18時間縮合反応させた。反応後に未反応のプロピレングリコールを減圧除去することで、常温高粘度液体であるエステル化合物(C-2-7)を得た。この化合物の酸価は0.2、水酸基価は240、数平均分子量(Mn)は550であった。
温度計、撹拌器及び還流冷却器を付した内容量3Lの四つ口フラスコに、テトラメチルビフェノール型エポキシ樹脂(エポキシ当量191g/eq.)を1337g、パラトルイル酸を905g、溶媒としてメチルイソブチルケトンを449g、触媒としてトリフェニルホスフィンを2gを加えて、115℃で9時間反応させた。続いて、酢酸を56g加え、140℃まで昇温し4時間反応させた。未反応原料および溶媒を140℃にて除去して、エステル化合物(C-1-1)を得た。この化合物の酸価は0.4、水酸基価は172、エポキシ当量は35万g/eq.数平均分子量(Mn)は690であった。
(メタ)アクリル樹脂A(三菱ケミカル社製PMMA系アクリル樹脂;アクリペットV)100質量部に対し、メチレンクロライド270質量部、メタノール30質量部および本発明の位相差制御剤(C-2-1)を5質量部、ならびにセルロース樹脂(セルロースアセテートプロピオネート;CAP)を10質量部加えて溶解し、ドープ液を得た。ドープ液をガラス板上に流延し、溶媒を留去する(乾燥する)ことで膜厚約60μmのフィルムを得た。得られたフィルムの透明性、耐熱性を上述の方法に従って評価した。評価結果を第1表に示す。また、各フィルムの熱延伸を上述の方法・条件にて行い、得られた延伸フィルムの光学特性を評価した。結果を同様に第1表に示す。
位相差制御剤の添加部数および種類、またセルロース樹脂の添加部数を表に記載の通りに配合し、実施例1と同様にしてフィルムを得た。実施例1と同様にして評価を行った。その結果を第1~8表に示す。
実施例1において、CAPの代わりにCAB(セルロースアセテートブチレート)を用いる以外は、実施例1と同様にして、第4~6表に示す配合割合でフィルムを得、それを評価した。結果を第9~16表に示す。
(メタ)アクリル樹脂A100質量部に対し、メチレンクロライド270質量部、メタノール30質量部加えて溶解し、ドープ液を得た。ドープ液をガラス板上に流延し、溶媒を留去する(乾燥する)ことで膜厚約60μmのフィルムを得た。得られたフィルムの透明性、耐熱性を上述の方法に従って評価した。評価結果を第2表に示す。また、熱延伸を上述の方法・条件にて行い、得られた延伸フィルムの光学特性を評価した。結果を同様に第17表に示す。
位相差制御剤の添加部数および種類、またセルロース樹脂の添加部数を表に記載の通りに配合し、比較例1と同様にしてフィルムを得た。比較例1と同様にして評価を行った。その結果を第17~22表に示す。
Claims (16)
- (メタ)アクリル樹脂(A)と、
セルロース樹脂(B)と、
位相差制御剤(C)と、を含有することを特徴とする、光学材料用樹脂組成物。 - (メタ)アクリル樹脂(A)100質量部に対して、セルロース樹脂(B)を0.5~20質量部含有する、請求項1に記載の光学材料用樹脂組成物。
- (メタ)アクリル樹脂(A)100質量部に対して、位相差制御剤(C)を0.5~20質量部含有する、請求項1または2に記載の光学材料用樹脂組成物。
- (メタ)アクリル樹脂(A)が、メタクリル酸エステル単位を重合単位として含む、請求項1から3のいずれか一項に記載の光学材料用樹脂組成物。
- セルロース樹脂(B)が、セルロースエステルを含有する、請求項1から4のいずれか一項に記載の光学材料用樹脂組成物。
- セルロースエステルが、セルロースアセテートプロピオネートである、請求項5に記載の光学材料用樹脂組成物。
- 位相差制御剤(C)が、エステル系位相差制御剤である、請求項1から6のいずれか一項に記載の光学材料用樹脂組成物。
- 位相差制御剤(C)が、下記一般式(1)
で表される化合物、下記一般式(2)~(4)、
で表される化合物である、請求項1から6のいずれか一項に記載の光学材料用樹脂組成物。 - 位相差制御剤(C)が、下記一般式(1-1-1)
で表される化合物(C-1)、又は下記一般式(2)~(4)
で表される化合物(C-2)である、請求項1から6のいずれか一項に記載の光学材料用樹脂組成物。 - 芳香族基(a1)と脂肪族基(a2)の平均の存在比〔(a1)/(a2)〕は、モル比で99.9/0.1~80/20である、請求項9に記載の光学材料用樹脂組成物。
- 前記Aが炭素数6~18のアリールジカルボン酸残基である、請求項8から10のいずれか一項に記載の光学材料用樹脂組成物。
- 前記R1~R4がそれぞれメチル基である、請求項8から11のいずれか一項に記載の光学材料用樹脂組成物。
- 前記(メタ)アクリル樹脂(A)がメタクリル酸メチルを用いて得られたものである、請求項1から12のいずれか一項に記載の光学材料用樹脂組成物。
- 請求項1から13のいずれか一項に記載の光学材料用樹脂組成物を含有することを特徴とする光学フィルム。
- 偏光板保護用である請求項14に記載の光学フィルム。
- 請求項14または15に記載の光学フィルムを有することを特徴とする液晶表示装置。
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