WO2020137577A1 - 光学材料用樹脂組成物、光学フィルム及び表示装置 - Google Patents
光学材料用樹脂組成物、光学フィルム及び表示装置 Download PDFInfo
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- WO2020137577A1 WO2020137577A1 PCT/JP2019/048659 JP2019048659W WO2020137577A1 WO 2020137577 A1 WO2020137577 A1 WO 2020137577A1 JP 2019048659 W JP2019048659 W JP 2019048659W WO 2020137577 A1 WO2020137577 A1 WO 2020137577A1
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- acrylic acid
- styrene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
- C08L25/14—Copolymers of styrene with unsaturated esters
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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
- G02B5/3083—Birefringent or phase retarding elements
Definitions
- the present invention relates to a resin composition for optical materials, an optical film and a display device.
- the polymer material used for the optical film has positive or negative birefringence.
- the positive or negative birefringence is a material exhibiting positive birefringence in which the refractive index in the molecular chain axis direction increases by stretching and negative birefringence in which the refractive index in the direction orthogonal to the molecular chain axis increases. Is defined as
- Polymer materials having negative birefringence include acrylic resins such as polymethylmethacrylate (PMMA) and styrene resins.
- acrylic resin films have been applied to various optical members due to their excellent transparency and design. There is.
- the acrylic film represented by PMMA is insufficient in the negative retardation developing property during stretching.
- Patent Documents 1-3 disclose a resin composition for optical materials in which a styrene resin is added to an acrylic resin. Usually, acrylic resins and styrene resins have poor compatibility with each other and do not become transparent. However, in Patent Documents 1-3, in order to improve compatibility, at least one of the resins contains a monomer having a specific functional group such as carboxylic acid. Compatibility is obtained by copolymerization.
- the resin compositions for optical materials disclosed in Patent Documents 1 to 3 also provide certain optical characteristics including a negative retardation, but further improvement in optical characteristics has been demanded.
- the problem to be solved by the present invention is to provide a resin composition for an optical material, which has high transparency, expression of negative retardation, and storage stability.
- the problem to be solved by the present invention is to provide an optical film having high transparency, negative retardation and performance stability.
- the present inventors have found that a (meth)acrylic resin (A) and a styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) are used.
- the resin composition for optical materials containing has high transparency and expression of negative retardation and storage stability, the film obtained from the composition has high transparency and negative retardation,
- the present invention has been completed by finding that it has performance stability that prevents deterioration over time.
- the present invention provides a resin composition for an optical material containing a (meth)acrylic resin (A) and a styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B). ..
- the present invention also provides an optical film containing the resin composition for an optical material.
- the present invention also provides a display device including the optical film.
- the present invention it is possible to provide a resin composition for an optical material, which has high transparency, expression of negative retardation and storage stability.
- the present invention can provide an optical film having high transparency, negative retardation and performance stability.
- the resin composition for an optical material of the present invention contains a (meth)acrylic resin (A) and a styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B).
- the (meth)acrylic resin and the styrene resin have poor compatibility and the mixture thereof is not transparent.
- the carboxyl of the (meth)acrylic acid is The group reduces the difference in polarity between the (meth)acrylic resin and the styrene resin, and the (meth)acrylic resin and the styrene resin are compatible with each other, whereby a transparent composition can be obtained.
- the introduction of the carboxyl group into the styrene resin causes a problem that the carboxyl group deteriorates the (meth)acrylic resin over time.
- the (meth)acrylic resin (A) is a polymer using a derivative of (meth)acrylic acid and/or a derivative of (meth)acrylic acid as a reaction raw material, and a derivative of (meth)acrylic acid and/or a (meth)acrylic acid. It is a polymer having a monomer unit derived from.
- the "reaction raw material” means a raw material that constitutes the (meth)acrylic resin (A), and does not include a solvent or a catalyst that does not constitute the (meth)acrylic resin (A).
- the monomer unit means a constitutional unit of a polymer compound.
- “(meth)acrylic acid” means one or both of acrylic acid and methacrylic acid.
- the (meth)acrylic acid derivative is preferably a (meth)acrylic acid ester.
- the (meth)acrylic resin (A) is preferably a polymer using a (meth)acrylic acid ester as a reaction raw material. Specifically, a polymer obtained by polymerizing a (meth)acrylic acid ester monomer in combination with another polymerizable monomer as necessary is preferable.
- Examples of the (meth)acrylic acid ester include (meth)acrylic acid alkyl ester, and specific examples thereof include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, and (meth ) Butyl acrylate, cyclohexyl (meth)acrylate, t-butylcyclohexyl (meth)acrylate and the like can be mentioned.
- the (meth)acrylic acid alkyl ester may be used alone or in combination of two or more.
- Examples of the other polymerizable monomer include aromatic vinyl compounds such as styrene, vinyltoluene and ⁇ -methylstyrene; vinyl cyanides such as acrylonitrile and methacrylonitrile; N-phenylmaleimide and N-cyclohexylmaleimide. Maleimides and the like.
- aromatic vinyl compounds are heat-resistant as the other monomer. It is preferable because an optical film having excellent economical efficiency can be obtained, and among them, styrene and ⁇ -methylstyrene are more preferable.
- the amount of the aromatic vinyl compound 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 (meth)acrylic acid ester.
- the (meth)acrylic resin (A) When a polymer using a (meth)acrylic acid ester monomer as a reaction raw material is used as the (meth)acrylic resin (A), one type of the (meth)acrylic acid ester monomer may be used alone, or two or more types may be used. You may use together. Further, when a polymer using a (meth)acrylic acid ester monomer and another polymerizable monomer as a reaction raw material is used as the (meth)acrylic resin (A), the (meth)acrylic acid ester monomer is used. May be used alone or in combination of two or more. The other polymerizable monomer may be used alone or in combination of two or more.
- the (meth)acrylic resin (A) is preferably a polymer composed of only monomer units derived from (meth)acrylic acid or a derivative of (meth)acrylic acid.
- the (meth)acrylic resin (A) include a methyl methacrylate polymer, an ethyl methacrylate polymer, a propyl methacrylate polymer, a butyl methacrylate polymer, a methyl acrylate polymer, an ethyl acrylate polymer, Methyl methacrylate-methyl acrylate copolymer, methyl methacrylate-ethyl methacrylate copolymer, methyl methacrylate-butyl methacrylate copolymer, methyl methacrylate-ethyl acrylate copolymer and the like can be mentioned.
- (Meth)acrylic acid methyl polymers are preferable because a film having excellent optical properties can be obtained and the cost efficiency is excellent.
- the weight average molecular weight of the (meth)acrylic resin (A) is 50,000 to 200,000, and a molded product such as a strong optical film can be obtained, the fluidity is sufficient, and the molding processability is excellent. This is preferable because a resin composition can be obtained, and 70,000 to 150,000 is more preferable.
- the number average molecular weight of the (meth)acrylic resin (A) is preferably 15,000 to 100,000, more preferably 20,000 to 50,000.
- the weight average molecular weight (Mw) and the number average molecular weight (Mn) are polystyrene-converted values based on gel permeation chromatography (GPC) measurement.
- GPC gel permeation chromatography
- the (meth)acrylic resin (A) may be a commercially available product as it is, or may be produced from the commercially available product by a known method.
- various production methods such as cast polymerization, bulk polymerization, suspension polymerization, solution polymerization, emulsion polymerization and anionic polymerization can be used as the production method. ..
- bulk polymerization and solution polymerization are preferable because a polymer in which minute foreign matter is less mixed can be obtained.
- solution polymerization a solution prepared by dissolving a mixture of raw materials in a solvent of aromatic hydrocarbon such as toluene or ethylbenzene can be used.
- the polymerization is carried out by bulk polymerization, the polymerization can be initiated by irradiation of free radicals generated by heating or irradiation with ionizing radiation as is usually done.
- any initiator that is generally used in radical polymerization can be used.
- an azo compound such as azobisisobutylnitrile
- an organic peroxide such as benzoyl peroxide, lauroyl peroxide, t-butylperoxy-2-ethylhexanoate, or the like is used.
- 1,1-bis(t-butylperoxy)3,3,5-trimethylcyclohexane, cyclohexane peroxide, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane examples thereof include 1,1-azobis(1-cyclohexanecarbonitrile) and 2-(carbamoylazo)isobutyronitrile. These initiators are used in the range of 0.005 to 5% by mass.
- a molecular weight modifier When polymerizing the (meth)acrylic resin (A), a molecular weight modifier may be used if necessary.
- the molecular weight regulator any one used in general radical polymerization is used, and preferable examples thereof include mercaptan compounds such as butyl mercaptan, octyl mercaptan, dodecyl mercaptan, and 2-ethylhexyl thioglycolate. These molecular weight regulators are added in a concentration range such that the molecular weight is controlled within the above range.
- the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is a copolymer using styrene, a (meth)acrylic acid ester, and (meth)acrylic acid as reaction raw materials.
- the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is a monomer unit derived from styrene, a monomer unit derived from (meth)acrylic acid ester and (meth)acrylic acid. It is a copolymer having a monomer unit derived from, and the polymerization form of the copolymer may be random or block.
- a monomer unit is a constitutional unit of a polymer compound.
- the styrene is meant to include styrene derivatives.
- the styrene derivative include ⁇ -methylstyrene, p-methylstyrene, o-methylstyrene, m-methylstyrene, ethylstyrene, pt-butylstyrene, hydroxystyrene, carboxystyrene, methoxystyrene and 4-methoxy-styrene. Examples thereof include 3-methylstyrene, dimethoxystyrene, vinyltoluene and the like.
- the styrene derivatives may be used alone or in combination of two or more.
- the (meth)acrylic acid ester is preferably a (meth)acrylic acid alkyl ester.
- the (meth)acrylic acid alkyl ester include cyclohexyl (meth)acrylate, t-butylcyclohexyl (meth)acrylate, cyclohexyl (meth)acrylate, methyl (meth)acrylate, ethyl (meth)acrylate, ( Butyl (meth)acrylate, isopropyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, adamantyl (meth)acrylate, dicyclopentanyl (meth)acrylate, isobornyl (meth)acrylate, (meth)acrylic Examples thereof include cyclopropyl acid, cyclobutyl (meth)acrylate, and cyclopentyl (meth)acrylate.
- the (meth)acrylic acid ester may be used alone or in combination of two
- the content of (meth)acrylic acid in the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is preferably 7.0 mol% or less, more preferably 6.0 mol. % Or less.
- the lower limit of the content of the (meth)acrylic acid is not particularly limited, but is, for example, 0.1 mol% or more.
- the content of the (meth)acrylic acid in the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is confirmed by the method described in Examples.
- the content of styrene in the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is preferably 10 to 80 mol%, more preferably 35 to 80 mol%.
- the content of the styrene in the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is confirmed by the method described in Examples.
- the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) can be used as a monomer other than styrene, (meth)acrylic acid ester and (meth)acrylic acid as long as the effects of the present invention are not impaired. It may have a monomer unit derived from it.
- Monomers other than styrene, (meth)acrylic acid ester and (meth)acrylic acid include vinyl cyanides such as acrylonitrile and methacrylonitrile; maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide; maleic anhydride and the like.
- the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is preferably a monomer unit derived from styrene, a monomer unit derived from (meth)acrylic acid ester and (meth) It is a copolymer consisting only of monomer units derived from acrylic acid.
- the number average molecular weight of the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is preferably 5,000 to 50,000, more preferably 10,000 to 50,000. , And more preferably 10,000 to 35,000.
- the (meth)acrylic resin (A) has a lower glass transition temperature than other resins used as an optical resin composition, and when an additive is added to the (meth)acrylic resin (A), the composition as a whole is obtained. The glass transition temperature is further lowered, and it becomes difficult to obtain sufficient heat resistance.
- the method for measuring the number average molecular weight of the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is the same as that for the (meth)acrylic resin (A).
- the mass ratio of the (meth)acrylic resin (A) and the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is the above (meth).
- the amount of the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) is preferably 5 to 100 parts by mass, and preferably 10 to 100 parts by mass, based on 100 parts by mass of the acrylic resin (A). It is more preferable to be present, and it is further preferable to be 20 to 100 parts by mass.
- the resin composition for an optical material of the present invention may contain the (meth)acrylic resin (A) and the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B), and other than these components Ingredients (optional resin ingredients and optional additives) may be included.
- the arbitrary resin component examples include polyolefin such as polyethylene and polypropylene; polystyrene, styrene resin such as styrene-acrylonitrile copolymer; polyamide, polyphenylene sulfide resin, polyether ether ketone resin, polyester resin, polysulfone, polyphenylene oxide, Examples thereof include thermoplastic resins such as polyimide, polyetherimide and polyacetal; and thermosetting resins such as phenol resin, melamine resin, silicone resin and epoxy resin. These resin components may be contained alone or in combination of two or more.
- the optional additives include inorganic fillers, pigments such as iron oxides, lubricants such as stearic acid, behenic acid, zinc stearate, calcium stearate, magnesium stearate, and ethylene bis-stearamide; release agents; Paraffin-based process oil, naphthene-based process oil, aromatic-based process oil, paraffin, organic polysiloxane, mineral oil and other softeners/plasticizers; hindered phenolic antioxidants, phosphorus-based heat stabilizers, lactone-based heat stabilizers Agents, antioxidants such as vitamin E heat stabilizers; hindered amine light stabilizers, light stabilizers such as benzoate light stabilizers; benzophenone UV absorbers, triazine UV absorbers, benzotriazole UV absorbers, etc. UV absorbers; flame retardants; antistatic agents; reinforcing agents for organic fibers, glass fibers, carbon fibers, metal whiskers, etc.; coloring agents, other additives, and mixtures thereof.
- the resin composition for an optical material of the present invention for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, 99% by mass or more, or 99.9% by mass or more is (meth). It may be an acrylic resin (A), a styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) and a solvent.
- the resin composition for optical materials of the present invention may essentially consist of (meth)acrylic resin (A), styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) and a solvent. .. In this case, unavoidable impurities may be included.
- the resin composition for an optical material of the present invention may be composed only of (meth)acrylic resin (A), styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) and a solvent. ..
- the optical film of the present invention contains the resin composition for an optical material of the present invention.
- the optical film of the present invention can exhibit both high transparency and negative retardation, and is excellent in performance stability. For example, it is possible to maintain high transparency even under a severe environment of high temperature and high humidity.
- the optical film of the present invention can exhibit a negative in-plane retardation (Re) and a negative thickness direction retardation (Rth).
- the in-plane retardation (Re) and the thickness direction retardation (Rth) are defined by the following equations.
- Re (nx-ny) ⁇ d
- Rth ((nx+ny)/2)-nz) ⁇ d
- nx is the main refractive index in the x direction, where x is the direction in which the refractive index is maximum in the optical film plane.
- ny is the main refractive index in the y direction when y is the direction perpendicular to the x direction in the optical film plane.
- nz is the main refractive index in the thickness direction of the optical film.
- d is the thickness (nm) of the optical film.
- the in-plane retardation (Re) in the optical film of the present invention is preferably ⁇ 15 nm or less, more preferably ⁇ 35 nm or less, further preferably ⁇ 50 nm or less.
- the retardation (Rth) in the thickness direction of the optical film of the present invention is preferably ⁇ 5 nm or less, more preferably ⁇ 15 nm or less, further preferably ⁇ 35 nm or less.
- the values of Re and Rth are determined by the draw ratio in the MD and TD directions, the film thickness, the mass ratio of the acrylic resin (A) and the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B). Can be adjusted.
- optical film of the present invention for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, 99% by mass or more, or 99.9% by mass or more is (meth)acrylic resin (A ), and styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B).
- the optical film of the present invention may consist essentially of (meth)acrylic resin (A) and styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B). In this case, unavoidable impurities may be included. Further, the optical film of the present invention may be composed only of the (meth)acrylic resin (A) and the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B).
- the optical film of the present invention is a polarizing plate protective film used for displays such as liquid crystal display devices, plasma displays, organic EL displays, field emission displays, and rear projection televisions, 1 ⁇ 4 wavelength plate, 1 ⁇ 2 wavelength. It can be suitably used for a plate, a viewing angle control film, a retardation film such as a liquid crystal optical compensation film, a display front plate, a light reflection preventing member and the like.
- 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 optical film of the present invention can be produced by using the resin composition for an optical material of the present invention.
- the optical film of the present invention is obtained, for example, by using the resin composition for an optical material of the present invention to produce an unstretched film by a method such as extrusion molding or cast molding, and stretching the unstretched film.
- Examples of the method for producing an unstretched film include a solution casting method (solvent casting method) that is cast molding.
- solvent casting method solvent casting method
- the unstretched film obtained by the solution casting method exhibits substantially optical isotropy.
- the film having optical isotropy can be used as an optical material such as a liquid crystal display, and is particularly useful as a protective film for a polarizing plate. Further, the film obtained by the above method is less likely to have irregularities formed on its surface and has excellent surface smoothness.
- the (meth)acrylic resin (A) and the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) are dissolved in a solvent,
- a first step of casting the resulting resin solution on a metal support, and a second step of distilling off and drying the organic solvent contained in the cast resin solution, followed by It comprises a third step of peeling the film formed on the metal support from the metal support and heating and drying.
- an endless belt-shaped or drum-shaped metal support can be exemplified.
- a stainless support whose surface is mirror-finished can be used. ..
- the resin solution When the resin solution is cast on the metal support, it is preferable to use a resin solution filtered with a filter in order to prevent foreign matter from being mixed in the obtained film.
- the drying method in the second step is not particularly limited, but is included in the resin solution cast by, for example, applying wind in the temperature range of 30 to 50° C. to the upper surface and/or the lower surface of the metal support.
- Examples include a method of 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 the film under a temperature condition higher than in the second step.
- the heating and drying method for example, a method of gradually increasing the temperature under a temperature condition of 100 to 160° C. is preferable because good dimensional stability can be obtained. By heating and drying under the temperature condition, the organic solvent remaining in the film after the second step can be almost completely removed.
- the organic solvent that can be used when the (meth)acrylic resin (A) and the styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer (B) are mixed and dissolved in an organic solvent
- the solvent is not particularly limited as long as it can dissolve, but examples thereof include solvents such as chloroform, methylene dichloride, and methylene chloride.
- the concentration of the (meth)acrylic resin (A) in the resin solution is preferably 10 to 50% by mass, more preferably 15 to 35% by mass.
- the optical film of the present invention can be obtained by stretching the obtained unstretched film.
- the optical film of the present invention can be obtained by longitudinal uniaxial stretching in the mechanical flow direction or transverse uniaxial stretching in the direction orthogonal to the mechanical flow direction.
- the present invention may also be carried out by biaxially stretching the obtained unstretched film 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.
- Optical film can be obtained.
- the stretching ratio in stretching is preferably 0.1% or more and 1000% or less in at least one direction, more preferably 0.2% or more and 600% or less, and 0.3% or more and 300% or less. Is more preferable.
- a stretched optical film that is preferable from the viewpoint of birefringence, heat resistance, and strength can be obtained.
- 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.
- Molded articles obtained from the optical material resin composition of the present invention are not limited to optical films, and in the fields of optical communication systems, optical switching systems, and optical measurement systems, waveguides, lenses, optical fibers, optical fiber substrates, and coatings. It can also be used as a material, an LED lens, a lens cover, and the like.
- Synthesis example 1 To a four-necked flask with an internal capacity of 0.5 L equipped with a thermometer, a stirrer, and a reflux condenser, 180 g of propylene glycol monomethyl ether (PGME) was added as a solvent, and nitrogen bubbling was performed while replacing the inside of the flask with nitrogen. The temperature was raised to °C. After the temperature was raised, a solution obtained by mixing 117 g of styrene, 54 g of methyl methacrylate, 9 g of acrylic acid and 1.8 g of perbutyl O (manufactured by NOF CORPORATION) as a polymerization initiator was added dropwise over 4 hours. After the dropping, the reaction was continued at 95° C.
- PGME propylene glycol monomethyl ether
- styrene resin B-1 which was a styrene-methyl methacrylate-acrylic acid copolymer which was a white solid at room temperature.
- Mn number average molecular weight of the styrene resin B-1 was evaluated by the following method and was 20,300.
- the content of acrylic acid in styrene resin B-1 was evaluated by the following method, the content of acrylic acid was 5.0 mol%.
- Synthesis example 2 To a four-necked flask with an internal capacity of 0.5 L equipped with a thermometer, a stirrer, and a reflux condenser, 180 g of propylene glycol monomethyl ether (PGME) was added as a solvent, and nitrogen bubbling was performed while replacing the inside of the flask with nitrogen. The temperature was raised to °C. After the temperature was raised, a solution prepared by mixing 117 g of styrene, 54 g of methyl methacrylate, 9 g of acrylic acid and 0.9 g of perbutyl O as a polymerization initiator was added dropwise over 4 hours. After the dropping, the reaction was continued at 95° C. for about 4 hours.
- PGME propylene glycol monomethyl ether
- styrene resin B-2 which was a styrene-methyl methacrylate-acrylic acid copolymer as a white solid at room temperature.
- the styrene resin B-2 was evaluated in the same manner as in Synthesis Example 1.
- the number average molecular weight (Mn) of the styrene resin B-2 was 30,000.
- the content of acrylic acid in styrene resin B-2 was 5.0 mol%.
- Synthesis example 3 To a four-necked flask with an internal capacity of 0.5 L equipped with a thermometer, a stirrer, and a reflux condenser, 180 g of propylene glycol monomethyl ether (PGME) was added as a solvent, and nitrogen bubbling was performed while replacing the inside of the flask with nitrogen. The temperature was raised to °C. After the temperature was raised, a solution prepared by mixing 167 g of styrene, 13 g of methacrylic acid and 0.9 g of perbutyl O as a polymerization initiator was added dropwise over 4 hours. After the dropping, the reaction was continued at 95° C. for about 4 hours.
- PGME propylene glycol monomethyl ether
- PGME was removed by applying a reduced pressure treatment to obtain a styrene resin C-1 which was a styrene-methacrylic acid copolymer as a white solid at room temperature.
- the styrene resin C-1 was evaluated in the same manner as in Synthesis Example 1.
- the number average molecular weight (Mn) of the styrene resin C-1 was 40,000.
- the content of methacrylic acid in styrene resin C-1 was 9.0 mol %.
- Synthesis example 4 To a four-necked flask with an internal capacity of 0.5 L equipped with a thermometer, a stirrer, and a reflux condenser, 180 g of propylene glycol monomethyl ether (PGME) was added as a solvent, and nitrogen bubbling was performed while replacing the inside of the flask with nitrogen. The temperature was raised to °C. After the temperature was raised, a solution prepared by mixing 158 g of styrene, 22 g of methacrylic acid and 0.9 g of perbutyl O as a polymerization initiator was added dropwise over 4 hours. After the dropping, the reaction was continued at 95° C. for about 4 hours.
- PGME propylene glycol monomethyl ether
- styrene resin C-2 which was a styrene-methacrylic acid copolymer which was a white solid at room temperature.
- the styrene resin C-2 was evaluated in the same manner as in Synthesis Example 1.
- the number average molecular weight (Mn) of the styrene resin C-2 was 37,000.
- the content of methacrylic acid in styrene resin C-2 was 11 mol%.
- Synthesis example 5 79 g of butyl acetate was added as a solvent to a four-necked flask having an internal capacity of 0.3 L equipped with a thermometer, a stirrer, and a reflux condenser, and nitrogen bubbling was performed to raise the temperature to 110° C. while substituting nitrogen in the flask. .. After the temperature was raised, a solution prepared by mixing 4 g of styrene, 5 g of 2-phenylpropene ( ⁇ -methylstyrene), 27 g of 1-adamantyl methacrylate, 1 g of methacrylic acid and 0.9 g of perbutyl O as a polymerization initiator was added dropwise over 4 hours.
- styrene resin B-3 which was a styrene- ⁇ -methylstyrene-adamantyl methacrylate-methacrylic acid copolymer which was a white solid at room temperature.
- Mn number average molecular weight
- the content of methacrylic acid in styrene resin B-3 was 5.0 mol%.
- Synthesis example 6 To a four-necked flask with an internal volume of 0.5 L equipped with a thermometer, a stirrer, and a reflux condenser, 134 g of propylene glycol monomethyl ether (PGME) was added as a solvent, and nitrogen bubbling was performed while replacing the inside of the flask with nitrogen. The temperature was raised to °C. After the temperature was raised, a solution prepared by mixing 78 g of styrene, 55 g of dicyclopentanyl methacrylate (DCPMA, manufactured by Hitachi Chemical Co., Ltd.), 3 g of methacrylic acid, and 2.5 g of perbutyl O as a polymerization initiator was added dropwise over 4 hours.
- DCPMA dicyclopentanyl methacrylate
- Example 1 80 parts by weight of a commercially available (meth)acrylic resin (meth)acrylic resin A (PMMA acrylic resin made by Mitsubishi Chemical Co.; Acrypet V) and 20 parts by weight of styrene resin B-1 produced in Synthesis Example 1 , 270 parts by mass of methylene chloride and 30 parts by mass of methanol were added and dissolved to obtain a dope solution. The obtained dope solution was cast on a glass plate and the solvent was distilled off (dried) to obtain a film having a thickness of about 60 ⁇ m. The transparency and heat resistance of the obtained unstretched film were evaluated according to the following methods. The results are shown in Table 1.
- the stretched film was allowed to stand at 23° C. and 55% relative humidity for 2 hours or more, and a birefringence measuring device (KOBRA-WR, manufactured by Oji Scientific Instruments) was used to measure the in-plane retardation (Re value) at a wavelength of 590 nm.
- the out-of-plane retardation (Rth value) was measured.
- Example 2-10 and Comparative Example 1-3 (Meth)acrylic resin A and styrene resins B-1, B-2, B-3, B-4, C-1 and C-2 were mixed in the mixing ratios shown in Tables 1 and 2, and the same as in Example 1. Then, an unstretched film and a stretched film were produced and evaluated. The results are shown in Tables 1 and 2.
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Abstract
Description
特許文献1-3では、アクリル樹脂にスチレン樹脂を加えた光学材料用樹脂組成物を開示する。通常、アクリル樹脂とスチレン樹脂は互いに相溶性が悪く透明にはならないが、特許文献1-3では、相溶性を高めるために、少なくとも一方の樹脂にカルボン酸等の特定の官能基を有するモノマーを共重合させることで相溶性を得ている。
特許文献1-3が開示する光学材料用樹脂組成物によっても、負の位相差を含む一定の光学特性が得られるものの、さらなる光学特性の向上が求められていた。
本発明が解決しようとする課題は、高い透明性と負の位相差と性能安定性を有する光学フィルムを提供することである。
本発明により、高い透明性と負の位相差と性能安定性を有する光学フィルムが提供できる。
本発明の光学材料用樹脂組成物は、(メタ)アクリル樹脂(A)と、スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)を含む。
本発明では、スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)を用いることで、(メタ)アクリル樹脂(A)との相溶性を確保しつつも、高い負の位相差の発現性と高い保存安定性が得られる。
((メタ)アクリル樹脂(A))
(メタ)アクリル樹脂(A)は、(メタ)アクリル酸及び/又は(メタ)アクリル酸の誘導体を反応原料とする重合体であり、(メタ)アクリル酸及び/又は(メタ)アクリル酸の誘導体に由来する単量体単位を有する重合体である。
尚、「反応原料」とは、(メタ)アクリル樹脂(A)を構成する原料という意味であり、(メタ)アクリル樹脂(A)を構成しない溶媒や触媒を含まない意味である。また、単量体単位とは、高分子化合物の構成単位を意味する。
本発明において、「(メタ)アクリル酸」とは、アクリル酸とメタクリル酸の一方又は両方をいう。
(メタ)アクリル樹脂(A)は、(メタ)アクリル酸エステルを反応原料とする重合体が好ましい。具体的には、(メタ)アクリル酸エステル単量体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重合体が好ましい。
前記(メタ)アクリル酸エステルとしては、例えば、(メタ)アクリル酸アルキルエステルが挙げられ、具体例としては(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸プロピル、(メタ)アクリル酸ブチル、(メタ)アクリル酸シクロヘキシル、(メタ)アクリル酸t-ブチルシクロヘキシル等が挙げられる。
前記(メタ)アクリル酸アルキルエステルは、1種単独でもよく、2種以上を併用してもよい。
尚、(メタ)アクリル樹脂(A)が(メタ)アクリル酸エステル単量体と他の重合性単量体を反応原料とする共重合体の場合、その重合形態はランダムでもブロックでもよい。
また、(メタ)アクリル樹脂(A)として、(メタ)アクリル酸エステル単量体と他の重合性単量体を反応原料とする重合体を用いる場合、前記(メタ)アクリル酸エステル単量体は1種単独でもよく、2種以上を併用してもよく、前記他の重合性単量体も1種単独でもよく、2種以上を併用してもよい。
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」
(メタ)アクリル樹脂(A)を製造する場合、その製造方法としては、例えば、キャスト重合、塊状重合、懸濁重合、溶液重合、乳化重合、アニオン重合等の種々の重合方法を用いることができる。製造方法の中でも、塊状重合や溶液重合が、微小な異物の混入が少ない重合体が得られることから好ましい。溶液重合を行う場合には、原料の混合物をトルエン、エチルベンゼン等の芳香族炭化水素の溶媒に溶解して調製した溶液を用いることができる。塊状重合により重合させる場合には、通常行われるように加熱により生じる遊離ラジカルや電離性放射線照射により重合を開始させることができる。
前記開始剤としては、例えば、アゾビスイソブチルニトリル等のアゾ化合物;ベンゾイルパーオキサイド、ラウロイルパーオキサイド、t-ブチルパーオキシ-2-エチルヘキサノエート等の有機過酸化物等が用いられる。90℃以上の高温下で重合をする場合には、溶液重合が一般的であるので、10時間半減期温度が80℃以上でかつ用いる有機溶媒に可溶である過酸化物、アゾビス開始剤などが好ましく、具体的には1,1-ビス(t-ブチルパーオキシ)3,3,5-トリメチルシクロヘキサン、シクロヘキサンパーオキシド、2,5-ジメチル-2,5-ジ(ベンゾイルパーオキシ)ヘキサン、1,1-アゾビス(1-シクロヘキサンカルボニトリル)、2-(カルバモイルアゾ)イソブチロニトリル等を挙げることができる。これらの開始剤は0.005~5質量%の範囲で用いられる。
前記分子量調節剤は、一般的なラジカル重合において用いる任意のものが使用され、例えば、ブチルメルカプタン、オクチルメルカプタン、ドデシルメルカプタン、チオグリコール酸2-エチルヘキシル等のメルカプタン化合物が好ましいものとして挙げられる。これらの分子量調節剤は、分子量が上記の範囲内に制御されるような濃度範囲で添加される。
スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)は、スチレンと(メタ)アクリル酸エステルと(メタ)アクリル酸を反応原料とする共重合体である。
スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)は、スチレンに由来する単量体単位、(メタ)アクリル酸エステルに由来する単量体単位及び(メタ)アクリル酸に由来する単量体単位を有する共重合体であり、当該共重合体の重合形態はランダムでもブロックでもよい。
尚、本明細書において、単量体単位とは、高分子化合物の構成単位である。
前記スチレンの誘導体としては、α-メチルスチレン、p-メチルスチレン、o-メチルスチレン、m-メチルスチレン、エチルスチレン、p-t-ブチルスチレン、ヒドロキシスチレン、カルボキシスチレン、メトキシスチレン、4-メトキシ-3-メチルスチレン、ジメトキシスチレン、ビニルトルエン等が挙げられる。
前記スチレンの誘導体は1種単独でもよく2種以上を併用してもよい。
前記(メタ)アクリル酸エステルは1種単独でもよく2種以上を併用してもよい。
前記(メタ)アクリル酸の含有量を7.0モル%以下とすることで、前記(メタ)アクリル酸のカルボキシル基が(メタ)アクリル樹脂(A)を劣化させてしまうことを防ぐことができる。
前記(メタ)アクリル酸の含有量の下限は特に限定されないが、例えば0.1モル%以上である。
スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)中の前記(メタ)アクリル酸の含有量は、実施例に記載の方法で確認する。
前記スチレンの含有量を上記範囲とすることで、得られるフィルムの透明性と負の位相差の発現性のバランスを良くすることができる。
スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)中の前記スチレンの含有量は、実施例に記載の方法で確認する。
前記スチレン、(メタ)アクリル酸エステル及び(メタ)アクリル酸以外のモノマーとしては、アクリロニトリル、メタクリルニトリル等のシアン化ビニル類;N-フェニルマレイミド、N-シクロヘキシルマレイミド等のマレイミド類;無水マレイン酸等の不飽和カルボン酸無水物類;マレイン酸等の不飽和酸類等が挙げられる。
スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)は、好ましくはスチレンに由来する単量体単位、(メタ)アクリル酸エステルに由来する単量体単位及び(メタ)アクリル酸に由来する単量体単位のみからなる共重合体である。
(メタ)アクリル樹脂(A)は光学樹脂組成物として用いられる他の樹脂と比較してガラス転移温度が低く、当該(メタ)アクリル樹脂(A)に添加剤を加えると、組成物全体としてのガラス転移温度が更に低下して、十分な耐熱性を得ることが難しくなる。スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)の数平均分子量を上記範囲とすることで、十分な耐熱性と十分な透明性を保持することができる。
本発明の光学材料用樹脂組成物は、(メタ)アクリル樹脂(A)とスチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)を含めばよく、これら成分以外のその他成分(任意の樹脂成分及び任意の添加剤)を含んでもよい。
本発明の光学材料用樹脂組成物は、本質的に(メタ)アクリル樹脂(A)、スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)及び溶剤からなってもよい。この場合、不可避不純物を含んでもよい。
また、本発明の光学材料用樹脂組成物は、(メタ)アクリル樹脂(A)、スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)及び溶剤のみからなってもよい。
本発明の光学フィルムは、本発明の光学材料用樹脂組成物を含む。
本発明の光学フィルムは、高い透明性と負の位相差の両方を示すことができ、性能安定性にも優れる。例えば、高温高湿下という過酷な環境下であっても高い透明性を維持することができる。
Re =(nx-ny)×d
Rth=((nx+ny)/2)-nz)×d
(式中、nxは、光学フィルム面内において屈折率が最大となる方向をxとした場合のx方向の主屈折率である。
nyは、光学フィルム面内においてx方向に垂直な方向をyとした場合のy方向の主屈折率である。
nzは、光学フィルムの厚み方向の主屈折率である。
dは、光学フィルムの厚み(nm)である。)
本発明の光学フィルムにおける、厚み方向レタデーション(Rth)は、好ましくは-5nm以下、より好ましくは-15nm以下、さらに好ましくは-35nm以下である。
前記Re及びRthの値は、MD及びTD方向の延伸倍率、フィルム厚さ、アクリル樹脂(A)及びスチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)の質量比により調整することができる。
本発明の光学フィルムは、本質的に(メタ)アクリル樹脂(A)、及びスチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)からなってもよい。この場合、不可避不純物を含んでもよい。
また、本発明の光学フィルムは、(メタ)アクリル樹脂(A)及びスチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)のみからなってもよい。
本発明の光学フィルムは、例えば、本発明の光学材料用樹脂組成物を用いて、押し出し成形、キャスト成形等の方法により未延伸フィルムを製造し、当該未延伸フィルムを延伸することにより得られる。
溶液流延法で得られる未延伸フィルムは、実質的に光学等方性を示す。前記光学等方性を示すフィルムは、例えば液晶ディスプレイなどの光学材料に使用することができ、中でも偏光板用保護フィルムに有用である。また、前記方法によって得られたフィルムは、その表面に凹凸が形成されにくく、表面平滑性に優れる。
温度計、攪拌機、及び還流冷却器を付した内容量0.5Lの四つ口フラスコに、溶媒としてプロピレングリコールモノメチルエーテル(PGME)を180g加え、窒素バブリングを行ってフラスコ内を窒素置換しながら95℃まで昇温した。昇温後、スチレン117g、メタクリル酸メチル54g、アクリル酸9g、重合開始剤としてパーブチルO(日油株式会社製)を1.8gとを混合した溶液を4時間かけて滴下した。滴下後、95℃で4時間ほど反応を継続した。反応終了後、減圧処理を施すことでPGMEを除去し、常温白色固体のスチレン-メタクリル酸メチル-アクリル酸共重合体であるスチレン樹脂B-1を得た。
下記方法によりスチレン樹脂B-1の数平均分子量(Mn)を評価したところ20,300であった。また、下記方法によりスチレン樹脂B-1中のアクリル酸の含有量を評価したところ、アクリル酸の含有量は5.0モル%であった。
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)により数平均分子量を測定した。
試料となるスチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)を重クロロホルムに溶解し、周波数500MHz、室温にて下記条件で13C-NMR測定を行なった。測定結果より、スチレン単位中のベンゼン環の炭素ピーク(130~140ppm付近)と(メタ)アクリル酸メチルのカルボニル炭素ピーク(170ppm付近)と(メタ)アクリル酸のカルボニル炭素ピーク(160ppm付近)の面積比から、試料中のスチレン単位と(メタ)アクリル酸メチル単位と(メタ)アクリル酸単位のモル比を求めた。
[13C-NMR測定条件]
測定装置 :日本電子株式会社製「JNM-ECA500」
溶媒 :重水素化クロロホルム
温度計、攪拌機、及び還流冷却器を付した内容量0.5Lの四つ口フラスコに、溶媒としてプロピレングリコールモノメチルエーテル(PGME)を180g加え、窒素バブリングを行ってフラスコ内を窒素置換しながら95℃まで昇温した。昇温後、スチレン117g、メタクリル酸メチル54g、アクリル酸9g、重合開始剤としてパーブチルOを0.9gとを混合した溶液を4時間かけて滴下した。滴下後、95℃で4時間ほど反応を継続した。反応終了後、減圧処理を施すことでPGMEを除去し、常温白色固体のスチレン-メタクリル酸メチル-アクリル酸共重合体であるスチレン樹脂B-2を得た。スチレン樹脂B-2について、合成例1と同じ方法で評価した。
スチレン樹脂B-2の数平均分子量(Mn)は30,000であった。
また、スチレン樹脂B-2中のアクリル酸の含有量は5.0モル%であった。
温度計、攪拌機、及び還流冷却器を付した内容量0.5Lの四つ口フラスコに、溶媒としてプロピレングリコールモノメチルエーテル(PGME)を180g加え、窒素バブリングを行ってフラスコ内を窒素置換しながら95℃まで昇温した。昇温後、スチレン167g、メタクリル酸13g、重合開始剤としてパーブチルOを0.9gとを混合した溶液を4時間かけて滴下した。滴下後、95℃で4時間ほど反応を継続した。反応終了後、減圧処理を施すことでPGMEを除去し、常温白色固体のスチレン-メタクリル酸共重合体であるスチレン樹脂C-1を得た。スチレン樹脂C-1について、合成例1と同じ方法で評価した。
スチレン樹脂C-1の数平均分子量(Mn)は40,000であった。
また、スチレン樹脂C-1中のメタクリル酸の含有量は9.0モル%であった。
温度計、攪拌機、及び還流冷却器を付した内容量0.5Lの四つ口フラスコに、溶媒としてプロピレングリコールモノメチルエーテル(PGME)を180g加え、窒素バブリングを行ってフラスコ内を窒素置換しながら95℃まで昇温した。昇温後、スチレン158g、メタクリル酸22g、重合開始剤としてパーブチルOを0.9gとを混合した溶液を4時間かけて滴下した。滴下後、95℃で4時間ほど反応を継続した。反応終了後、減圧処理を施すことでPGMEを除去し、常温白色固体のスチレン-メタクリル酸共重合体であるスチレン樹脂C-2を得た。スチレン樹脂C-2について、合成例1と同じ方法で評価した。
スチレン樹脂C-2の数平均分子量(Mn)は37,000であった。
また、スチレン樹脂C-2中のメタクリル酸の含有量は11モル%であった。
温度計、攪拌機、及び還流冷却器を付した内容量0.3Lの四つ口フラスコに、溶媒として酢酸ブチルを79g加え、窒素バブリングを行ってフラスコ内を窒素置換しながら110℃まで昇温した。昇温後、スチレン4g、2-フェニルプロペン(αメチルスチレン)5g、1-アダマンチルメタクリレート27g、メタクリル酸1g、重合開始剤としてパーブチルO 0.9gとを混合した溶液を4時間かけて滴下した。滴下後、110℃で4時間ほど反応を継続した。反応終了後、減圧処理を施すことで酢酸ブチルを除去し、常温白色固体であるスチレン-αメチルスチレン-アダマンチルメタクリレート-メタクリル酸共重合体であるスチレン樹脂B-3を得た。
得られたスチレン樹脂B-3について合成例1と同様にして評価したところ、数平均分子量(Mn)は6,500であった。
また、スチレン樹脂B-3中のメタクリル酸の含有量は5.0モル%であった。
温度計、攪拌機、及び還流冷却器を付した内容量0.5Lの四つ口フラスコに、溶媒としてプロピレングリコールモノメチルエーテル(PGME)を134g加え、窒素バブリングを行ってフラスコ内を窒素置換しながら95℃まで昇温した。昇温後、スチレン78g、ジシクロペンタニルメタクリレート(DCPMA、日立化成社製)55g、メタクリル酸3g、重合開始剤としてパーブチルO 2.5gとを混合した溶液を4時間かけて滴下した。滴下後、95℃で4時間ほど反応を継続した。反応終了後、減圧処理を施すことでプロピレングリコールモノメチルエーテルを除去し、常温白色固体であるスチレン-ジシクロペンタニルメタクリレート-メタクリル酸共重合体であるスチレン樹脂B-4を得た。
得られたスチレン-アクリル樹脂B-4について合成例1と同様にして評価したところ、数平均分子量(Mn)は9,300であった。
また、スチレン樹脂B-4中のメタクリル酸の含有量は3.0モル%であった。
80質量部の市販の(メタ)アクリル樹脂である(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)と20質量部の合成例1で製造したスチレン樹脂B-1に、メチレンクロライド270質量部及びメタノール30質量部を加えて溶解し、ドープ液を得た。
得られ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。得られた未延伸フィルムの透明性及び耐熱性を下記の方法に従って評価した。結果を表1に示す。
得られたフィルムを打ち抜き機で打ち抜いて40mm角の試験片とし、この試験片について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。
尚、HAZE値は小さいほど、透明性に優れることを示す。
(未延伸フィルムの耐熱性)
得られたフィルムについて、動的粘弾性測定(DMA)装置を用いてtanδを測定し、tanδのピークトップ値における温度をTgと定義し、その値を評価した。
未延伸フィルムを超音波カッターで切り抜いて5.5cm角の試験片とし、二軸延伸機(株式会社井元製作所製)を用いて、下記条件にて自由一軸延伸を行った。
倍率:2.0倍
速度:100%/min
温度:(DMA測定のtanδピークトップを与える温度)-12℃
延伸フィルムを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)および面外位相差(Rth値)を測定した。
フィルムを金属クリップに挟み、吊るした状態で温度70℃、相対湿度90%RHの恒温恒湿中に5日間放置した。その後、濁度計(日本電色工業株式会社製「NDH 5000」)を用いて、JIS K 7105に準じて、延伸フィルムのHAZE値を測定すると共に目視による延伸フィルム全体の透明度の評価を行った。
HAZEが1.0以下で、かつ、フィルム全体が透明である延伸フィルムを「○」と評価し、HAZEが1.0を超えるもの、および、HAZEが1.0以下であっても一部白濁が目視で確認された延伸フィルムは「×」と評価した。
(メタ)アクリル樹脂Aとスチレン樹脂B-1、B-2、B-3、B-4、C-1及びC-2を表1及び2に示す配合割合で配合し、実施例1と同様にして未延伸フィルム及び延伸フィルムを製造し評価した。結果を表1及び2に示す。
Claims (8)
- (メタ)アクリル樹脂(A)と、
スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)とを含む光学材料用樹脂組成物。 - 前記スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)中の(メタ)アクリル酸の含有量が7.0モル%以下である請求項1に記載の光学材料用樹脂組成物。
- 前記スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)中のスチレンの含有量が10~80モル%である請求項1又は2に記載の光学材料用樹脂組成物。
- 前記スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)の数平均分子量が5,000~50,000である請求項1~3のいずれか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)100質量部に対して、前記スチレン-(メタ)アクリル酸エステル-(メタ)アクリル酸共重合体(B)を10~100質量部含む請求項1~4のいずれかに記載の光学材料用樹脂組成物。
- 請求項1~5のいずれかに記載の光学材料用樹脂組成物を含む光学フィルム。
- 請求項6に記載の光学フィルムを備える表示装置。
- 有機ELディスプレイ又は液晶ディスプレイである請求項7に記載の表示装置。
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03217446A (ja) * | 1990-01-22 | 1991-09-25 | Dainippon Ink & Chem Inc | 熱可塑性樹脂組成物 |
JPH0784122A (ja) * | 1993-07-23 | 1995-03-31 | Toray Ind Inc | カラーフィルタの製造方法 |
JP2006134872A (ja) * | 2004-10-06 | 2006-05-25 | Toray Ind Inc | 透明導電性フィルム及びタッチパネル |
WO2014112452A1 (ja) * | 2013-01-15 | 2014-07-24 | 日産化学工業株式会社 | 硬化膜形成用樹脂組成物 |
WO2014163100A1 (ja) * | 2013-04-03 | 2014-10-09 | 日産化学工業株式会社 | 無溶剤型光硬化性樹脂組成物 |
JP2017179354A (ja) * | 2016-03-29 | 2017-10-05 | 旭化成株式会社 | メタクリル系樹脂組成物、及び成形体 |
WO2018105532A1 (ja) * | 2016-12-05 | 2018-06-14 | 旭化成株式会社 | 感光性樹脂組成物、感光性樹脂積層体、樹脂パターンの製造方法及び硬化膜パターン製造方法 |
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DE4443557A1 (de) * | 1994-12-07 | 1996-06-13 | Roehm Gmbh | Hochwärmeformbeständige, spannungsrißbeständige Polymethacrylat-Formmassen |
JP5057807B2 (ja) | 2006-09-14 | 2012-10-24 | 旭化成イーマテリアルズ株式会社 | アクリル系樹脂およびスチレン系樹脂を含む位相差フィルム |
JP5484678B2 (ja) | 2007-02-14 | 2014-05-07 | 旭化成イーマテリアルズ株式会社 | 光学素子用成形体 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03217446A (ja) * | 1990-01-22 | 1991-09-25 | Dainippon Ink & Chem Inc | 熱可塑性樹脂組成物 |
JPH0784122A (ja) * | 1993-07-23 | 1995-03-31 | Toray Ind Inc | カラーフィルタの製造方法 |
JP2006134872A (ja) * | 2004-10-06 | 2006-05-25 | Toray Ind Inc | 透明導電性フィルム及びタッチパネル |
WO2014112452A1 (ja) * | 2013-01-15 | 2014-07-24 | 日産化学工業株式会社 | 硬化膜形成用樹脂組成物 |
WO2014163100A1 (ja) * | 2013-04-03 | 2014-10-09 | 日産化学工業株式会社 | 無溶剤型光硬化性樹脂組成物 |
JP2017179354A (ja) * | 2016-03-29 | 2017-10-05 | 旭化成株式会社 | メタクリル系樹脂組成物、及び成形体 |
WO2018105532A1 (ja) * | 2016-12-05 | 2018-06-14 | 旭化成株式会社 | 感光性樹脂組成物、感光性樹脂積層体、樹脂パターンの製造方法及び硬化膜パターン製造方法 |
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