WO2020175580A1 - 光学フィルム用のドープおよびその製造方法、光学フィルム、偏光板、ならびに光学フィルムの製造方法 - Google Patents
光学フィルム用のドープおよびその製造方法、光学フィルム、偏光板、ならびに光学フィルムの製造方法 Download PDFInfo
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- WO2020175580A1 WO2020175580A1 PCT/JP2020/007859 JP2020007859W WO2020175580A1 WO 2020175580 A1 WO2020175580 A1 WO 2020175580A1 JP 2020007859 W JP2020007859 W JP 2020007859W WO 2020175580 A1 WO2020175580 A1 WO 2020175580A1
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- optical film
- fine particles
- dope
- matrix resin
- copolymer
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- 0 CC(C)(C)*C(C1)C(C2)C(C3C(C4)C(*)(*5CC5)C(C)(*)C4C4C3)C4C2C1C(C)(C)C Chemical compound CC(C)(C)*C(C1)C(C2)C(C3C(C4)C(*)(*5CC5)C(C)(*)C4C4C3)C4C2C1C(C)(C)C 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/126—Polymer particles coated by polymer, e.g. core shell structures
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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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
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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
- 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
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
Definitions
- the present invention relates to a dope for an optical film and a method for producing the same, an optical film, a polarizing plate, and a method for producing an optical film.
- a display device such as a liquid crystal display device or an organic liquid crystal display device has an optical film such as a polarizing plate protective film.
- an optical film a film containing a cycloolefin resin or a (meth)acrylic resin as a main component may be used because it has excellent transparency, dimensional stability, and low hygroscopicity. ..
- These films usually contain fine particles (matting agent) such as silica particles in order to impart lubricity.
- fine particles such as silica particles
- a film containing fine particles is liable to increase internal haze and impair transparency. Therefore, various films have been proposed as a film that imparts slipperiness without increasing the internal haze of the film.
- Patent Document 1 contains a cyclic olefin resin and fine particles, the absolute value of the refractive index difference between the cyclic olefin resin and the fine particles is ⁇ n, and the average particle diameter of the fine particles is " At that time, a cyclic olefin-based resin film in which ⁇ n “is adjusted to be not more than 0.05 is disclosed.
- Patent Document 2 has a multilayer structure including a base layer and a surface layer, and only the surface layer is Hachimen "A cyclic olefin resin film containing fine particles satisfying "0.05 or less” is disclosed. By thus adjusting the "triangle" to a predetermined range, the internal haze can be increased without increasing. It is said that it can give good slipperiness.
- Patent Document 1 Japanese Unexamined Patent Publication No. 20 07 _ 1 1 2 9 6 7
- Patent Document 2 Japanese Patent Laid-Open No. 20 07-2 61 05 2
- Patent Document 1 was not able to sufficiently reduce the internal haze. Further, although the film of Patent Document 2 can reduce the internal haze, it cannot sufficiently enhance the slipperiness and cannot suppress the sticking.
- cycloolefin-based resins and (meth)acrylic-based resins have lower elastic moduli than cellulose ester-based resins used for conventional optical films, and therefore, are stuck in a mouth-like state. It is easy to get stuck. As a result, uneven thickness in the width direction of the optical film occurs, and sticking failures such as black bands (striped stripes formed in the longitudinal direction) are likely to occur.
- the present invention has been made in view of the above circumstances, has sufficient slipperiness without increasing internal haze, and has a sticking failure, for example, when wound in a mouth shape. It is an object of the present invention to provide a dope for an optical film, a method for producing the same, an optical film, a polarizing plate, and a method for producing the optical film, which are capable of imparting an optical film capable of suppressing the above.
- the dope for the optical film of the present invention contains a matrix resin, coated fine particles, and a solvent, and the coated fine particles have a difference in refractive index from the matrix resin of 0.01 or less, and an average value.
- the copolymer has a particle size [3 ⁇ 4 1 of 0.01 to 0.4 and fine particles and a coating layer that covers at least a part of the surface of the copolymer resin and contains the matrix resin.
- the difference in refractive index between a part of the matrix resin and the matrix resin is 0.01 or less, and the average particle diameter [3 ⁇ 4 1 is 0.01.
- At least one of the following requirements ( ⁇ ) to ( ⁇ ) is satisfied.
- the content of the matrix resin in the fine particle dispersion is 1 65 parts by mass or more based on 100 parts by mass of the copolymer fine particles.
- the temperature at the time of preparing the fine particle dispersion is 40 ° ⁇ or higher.
- the method for producing a dope of the present invention is 1) having a difference in refractive index from the matrix resin of ⁇ .
- the dispersion compound is a sugar ester compound, a cellulose diacetate having a number average molecular weight of 1,000 to 60,000, and a methyl acrylate-based compound. It is one or more selected from the group consisting of oligomers, and the content of the dispersion compound is 100 to 1500 parts by mass with respect to 100 parts by mass of the copolymer fine particles.
- the optical film of the present invention is an optical film containing a matrix resin and copolymer fine particles having a refractive index difference of not more than 0.01 with the matrix resin.
- the average particle diameter of the copolymer fine particles [3 ⁇ 4 1'is 0.011 to 0.4] measured by observing the surface on the same day as IV!, and the optical film is attached to the film: methylene chloride.
- the polarizing plate of the present invention includes a polarizer and the optical film of the present invention disposed on at least one surface of the polarizer.
- the method for producing an optical film of the present invention includes the steps of casting a dope for an optical film of the present invention on a support, followed by drying and peeling to obtain a film. Effect of the invention
- an optical film having sufficient slipperiness without increasing internal haze and capable of suppressing sticking failure and the like when wound in a mouth shape.
- a dope for a film and a method for producing the same, an optical film, a polarizing plate, and a method for producing an optical film can be provided.
- FIG. 1 And a graph showing an example of the relationship between the internal haze and the internal haze.
- the agglomeration of fine particles not only increases the internal haze of the film, but also the amount of fine particles remaining on the film is reduced due to the fine particles falling off, so that it is not possible to form a sufficient number of irregularities. Can not get a good slipperiness
- the inventors of the present invention by coating each of the fine particles with a resin at the stage of dope, suppress the aggregation of the fine particles and increase the intermolecular bond between the resin and the fine particles. Then, it was found that it is possible to suppress the falling of fine particles at the time of peeling. That is, it is preferable that the resin is adsorbed or protected on the surface of the fine particles in the dope, that is, the average particle size measured by the dynamic light scattering method is large. The resin-coated fine particles are less likely to aggregate and can be well dispersed.
- the present inventors examined the amount of coating on the surface of the fine particles.
- FIG. And the internal haze of the film.
- the copolymer fine particles are ⁇ 0 2020/175 580 6 ⁇ (: 171? 2020 /007859
- the surface can be well covered with resin. Therefore, the internal haze of the obtained film can be sufficiently reduced.
- the amount of resin covering the surface of the copolymer fine particles becomes too large, and the mechanical strength (elastic modulus) of the film is likely to decrease. If the mechanical strength (elastic modulus) of the film is lowered, as described above, the films are likely to stick to each other, which causes a sticking failure such as a black band.
- the present inventors have found that the surface of the copolymer fine particles is covered with a resin so that the internal haze is sufficiently reduced and the mechanical strength (elastic modulus) of the film is not lowered.
- the dope of the present invention contains a matrix resin, coated fine particles in which at least a part of the surface of the copolymer fine particles is coated with a resin, and a solvent. Then, when the average particle diameter of the copolymer fine particles is 1, and the average particle diameter of the coated fine particles measured by the dynamic light scattering method in the dope is 2, 2/1 is 2
- the dope of the present invention contains a matrix resin, coated fine particles, and a solvent.
- the matrix resin can usually be a thermoplastic resin.
- a (meth)acrylic resin, a cycloolefin resin having a polar group, or Cellulose acetate probionate is preferred.
- the (meth)acrylic resin is a homopolymer of (meth)acrylic acid ester or a copolymer of (meth)acrylic acid ester and a copolymerizable monomer.
- (meth)acrylic means acrylic or methacrylic.
- (Meth)acrylic acid ester is methyl methacrylate ⁇ 0 2020/175 580 7 ⁇ (: 171? 2020 /007859
- the (meth)acrylic resin contains a structural unit derived from methyl methacrylate, and is a copolymerizable monomer other than methyl methacrylate copolymerizable therewith (hereinafter, simply referred to as "copolymerized monomer"). May further include a structural unit derived from.
- the copolymerization monomer is not particularly limited, but it is preferable that the copolymerization monomer contains a copolymerization monomer having a ring structure from the viewpoint of easily improving the drying property during solution film formation.
- the ring structure include an alicyclic ring, an aromatic ring and an imide ring. Since the copolymerized monomer having such a ring structure has a large free volume of molecules, there is a space (space) for moving solvent molecules in the resin matrix of the film-shaped material during the solution film-forming process. Easy to form. Thereby, the solvent removability, that is, the drying property can be improved.
- Examples of the copolymerizable monomer having a ring structure include:
- Vinyls having an alicyclic ring such as vinylcyclohexane
- Vinyls having aromatic rings such as styrene, ⁇ -methylstyrene, 01-methylstyrene, _methylstyrene, ⁇ -methylstyrene; and
- Maleids such as 1 ⁇ 1—phenylmaleamide, 1 ⁇ 1—ethylmaleamide, 1 ⁇ 1—propylmaleamide, 1 ⁇ 1—cyclohexylmaleamide, 1 ⁇ 1— ⁇ —chlorophenylmaleamide.
- Compound having a ring Compound having a ring.
- the copolymerizable monomer having a ring structure is a copolymerized monomer having an aromatic ring (for example, vinyls having an aromatic ring) or a copolymerized monomer having an imide ring (for example, maleimides). It is preferable. These monomers easily increase the glass transition temperature of the (meth)acrylic resin.
- the structural unit derived from the copolymerization monomer is a copolymerization monomer having a ring structure. ⁇ 0 2020/175580 8 ⁇ (: 171? 2020 /007859
- It may further contain a structural unit derived from a copolymerization monomer other than the derived structural unit.
- Examples of other copolymerizable monomers include copolymerizable monomers having no ring structure, that is,
- Unsaturated carboxylic acids such as (meth)acrylic acid, crotonic acid, (meth)acrylic acid;
- Olefins such as vinyl acetate, ethylene and propylene
- Vinyl halides such as vinyl chloride, vinylidene chloride, vinylidene fluoride
- (meth)acrylic amides such as (meth)acrylic amide, methyl (meth)acrylic amide, ethyl (meth)acrylic amide, and propyl (meth)acrylic amide. These may be used alone or in combination of two or more.
- the content of the (meth)acrylic resin contains structural units derived from a copolymerized monomer having a ring structure
- the content is 1 based on all structural units constituting the (meth)acrylic resin. It is preferably ⁇ to 40% by mass, more preferably 10 to 30% by mass.
- the content of the structural unit derived from the copolymerized monomer having a ring structure is 10% by mass or more, the glass transition temperature of the (meth)acrylic resin is easily increased, and thus the drying temperature during solution film formation is easily increased. Not only that, because of the ring structure in the film, it is easy to form a space in which the solvent can move, so that the drying property is easily improved.
- the content of the structural unit derived from the copolymerized monomer having a ring structure is 40% by mass or less, a (meth)acrylic resin is contained. The film is not too brittle.
- the type and composition of the (meth)acrylic resin monomer can be specified by 1 H_NMR.
- the glass transition temperature (T g) of the (meth)acrylic resin is preferably 90 ° C. or higher.
- T g of the (meth)acrylic resin is 90 ° C or higher, not only the heat resistance of the optical film can be increased, but also the drying temperature during solution film formation can be increased, so that the drying property is easily improved. ..
- the Tg of the (meth)acrylic resin is more preferably 100 to 150°C.
- the glass transition temperature (T g) of the (meth)acrylic resin is determined by JISC 7 1 2 1 -201 2 or AS using DSC (Differential Scanning Color Metry: Differential Scanning Calorimetry). It can be measured according to TM D 34 1 8-82.
- the glass transition temperature (T g) of the (meth)acrylic resin can be adjusted by the monomer composition.
- the weight average molecular weight (Mw) of the (meth)acrylic resin is preferably 400,000 to 3,000,000.
- the weight-average molecular weight of the methacrylic resin is within the above range, the film-forming property and the drying property are less likely to be impaired while imparting sufficient mechanical strength (toughness) to the film.
- the weight average molecular weight of the (meth)acrylic resin is more preferably 500,000 to 2,000,000.
- the weight average molecular weight (Mw) of the (meth)acrylic resin can be measured in terms of polystyrene by gel permeation chromatography (GPC). Specifically, using Tosoh HLC 8220 G PC) and column (Tosoh TS K-GE LG 6000 HXL-G 5000 HXL-G 500 0 HXL— G 4000 HXL— G 3000 HXL series) It can be measured. The measurement conditions may be the same as in the examples described below. ⁇ 0 2020/175 580 10 ⁇ (: 171? 2020 /007859
- the cycloolefin resin having a polar group is not particularly limited, but is preferably a polymer containing a structural unit derived from a norbornene skeleton-containing monomer having a polar group.
- the norbornene skeleton-containing monomer having a polar group is preferably a monomer represented by the formula (8_1) or (8-12), which facilitates localization of the polar group of the resin on the film surface. From this viewpoint, the monomer represented by the formula (81) is more preferable.
- 30 represents a hydrocarbon group or a polar group. However, At least one of the is a polar group. Also, And are hydrogen atoms, and Except when and 4 is a group other than a hydrogen atom.
- the polar group refers to a functional group in which polarization is caused by a high electronegativity atom such as an oxygen atom, a sulfur atom and a nitrogen atom.
- a polar group include a forceoxy group, a hydroxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an amino group, an amide group, a cyano group, and these groups via a linking group such as an alkylene group. And groups bonded together are included.
- a carboxy group, a hydroxy group, an alkoxycarbonyl group or an aryloxycarbonyl group is preferable, and an alkoxycarbonyl group and an aryloxycarbonyl group are more preferable from the viewpoint of ensuring solubility during solution film formation.
- [0045] represents an integer of 0 to 2.
- [0048] represents a polar group.
- the polar group include those similar to the above. Of these, a carboxy group, a hydroxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an amino group, an amide group, or a cyano group is preferable, and a carboxy group, a hydroxy group, an alkoxycarbonyl group, and an aryloxycarbonyl group are more preferable. From the viewpoint of ensuring solubility during solution film formation, an alkoxyoxy group or an aryloxycarbonyl group is more preferable.
- [0049] represents an integer of 0 to 2.
- Examples of the monomer represented by the formula (81-1) or (81-1) include the following.
- the cycloolefin-based resin having a polar group is a structural unit derived from a copolymerization monomer (hereinafter, referred to as "copolymerization monomer”) copolymerizable with the norbornene skeleton-containing monomer having a polar group as necessary. May be further included.
- copolymerization monomer a copolymerization monomer copolymerizable with the norbornene skeleton-containing monomer having a polar group as necessary. May be further included.
- Examples of the copolymerizable monomer include a norbornene skeleton-containing monomer having no polar group. ⁇ 0 2020/175 580 13 ⁇ (: 171? 2020 /007859
- a norbornene skeleton-containing monomer having a polar group and a ring-opening copolymerizable copolymerization monomer and a norbornene skeleton-containing monomer having a polar group and an addition copolymerizable copolymerization monomer are included.
- Examples of the copolymerizable monomer capable of ring-opening copolymerization include cycloolefins having no norbornene skeleton, such as cyclobutene, cyclopentene, cycloheptene, cyclooctene, and dicyclopentadiene.
- Examples of the copolymerizable monomer capable of addition copolymerization include unsaturated double bond-containing compounds, vinyl cyclic hydrocarbon monomers, and (meth)acrylic acid ester.
- Examples of the unsaturated double bond-containing compound are olefinic compounds having 2 to 12 (preferably 2 to 8) carbon atoms, and examples thereof include ethylene, propylene and butene.
- Examples of vinyl-based cyclic hydrocarbon monomers include vinyl-cyclopentene-based monomers such as 4-vinylcyclopentene and 2-methyl-4-isopropenylcyclopentene.
- Examples of (meth)acrylate esters include (meth)methyl acrylate, (meth)2-ethylhexyl acrylate, (meth)cyclohexyl acrylate, and other (meth)acrylic acid having 1 to 20 carbon atoms. Includes alkylester.
- the cycloolefin-based resin having a polar group is preferably a homopolymer or copolymer of a monomer represented by the formula (81-1) or (8_2). The following are listed.
- the cycloolefin-based resin is preferably a polymer containing the structural unit represented by the formula (Minichi 1) or the structural unit represented by the formula (Min-2).
- the structural unit represented by the formula (Mi — _ 1) is derived from the monomer represented by the above formula (8 — 1); the structural unit represented by the formula (Mi — _ 2) is _ 2) derived from the monomer.
- Such a cycloolefin resin is a polymer containing the structural unit represented by the formula (Minichi 2), or the structural unit represented by the formula (Min_1) and the formula (6-2)
- a polymer containing both structural units is preferred. This is because the cycloolefin resin has a high glass transition temperature and is excellent in transparency.
- Containing structural units derived from a norbornene skeleton-containing monomer having a polar group (preferably the total amount of the structural units represented by the formula (Min _ 1) and the structural unit represented by the formula (Min _ 2)) May be 50 to 100% by mass based on all structural units constituting the cycloolefin resin.
- Weight average molecular weight of cycloolefin resin having polar group Is preferably 20,000 to 300,000.
- the weight average molecular weight (IV! ⁇ «) of the cycloolefin resin having a polar group is within the above range, the film-forming property is less likely to be impaired while imparting sufficient mechanical strength to the film.
- the weight average molecular weight (1 ⁇ /1) of the cycloolefin resin having a polar group is more preferably 40,000 to 200,000.
- the weight average molecular weight (1 ⁇ /1) can be measured by the same method as described above.
- the glass transition temperature (Choose 9) of the cycloolefin resin having a polar group is usually 110°C or higher, preferably 1100 to 350°C, and 120°C. ⁇ 250° ⁇ is more preferable, and 120 to 220° ⁇ is particularly preferable.
- the glass transition temperature (C9) is 110 ° or higher, deformation due to use under high temperature conditions and secondary processing such as coating and printing is suppressed, which is preferable.
- the glass transition temperature (Choose 9) is 350 ° C. or less because the resin deterioration due to the molding process and heat during the molding process is suppressed. ⁇ 0 2020/175 580 16 ⁇ (: 171? 2020 /007859
- Cellulose acetate probionate is a compound obtained by esterifying cellulose with acetic acid and propionic acid.
- the total degree of substitution of acyl groups (the total of the degree of substitution of acetyl groups and the degree of substitution of propionyl groups) of cellulose acetate probionate is preferably 2 to 3, and 2 to 2 More preferably.
- the substitution degree of the acetyl group is preferably 1.2 to 2.95, and the substitution degree of the probionate group is It is preferably from 0.1 to 2.0.
- the substitution degree of the acyl group of cellulose ester can be measured by the method specified in 8 3 1//1 _ 0 8 1 7 -96.
- the glass transition temperature (Choose 9) of cellulose acetate probionate is preferably 140 to 200°C, and more preferably 160 to 190°C.
- the glass transition temperature can be measured by the same method as described above.
- the weight average molecular weight of cellulose acetate probionate is preferably 100,000 to 500,000, and preferably 150,000 to 300,000 in order to obtain a mechanical strength of a certain level or more. More preferable.
- the weight average molecular weight (1 ⁇ /1) can be measured by the same method as described above.
- a (meth)acrylic resin or a cycloolefin resin having a polar group is preferable because it has low hygroscopicity.
- the resin concentration of the dope (content of the matrix resin with respect to the dope) is preferably 25 mass% or more. When the resin concentration of the dope is 25% by mass or more, the concentration of the matrix resin is moderately high, so that the matrix resin is likely to stably exist in a state where the matrix resin is attached to the surface of the copolymer fine particles.
- the resin concentration of the dope is more preferably 30 to 40% by mass from the above viewpoint and from the viewpoint of easily obtaining a film having a uniform film thickness.
- the coated fine particles are particles in which at least a part of the surface of the copolymer fine particles is covered with resin (particles adsorbed by resin). That is, the coated fine particles have copolymer fine particles and a coating layer that covers at least a part of the surface thereof.
- the copolymer fine particles are fine particles made of a copolymer having a refractive index difference with the matrix resin of 0.01 or less. Such copolymer fine particles are less likely to impair the transparency of the obtained optical film, and can impart good slipperiness.
- the refractive index of the matrix resin and the copolymer fine particles may be the refractive index of light having a wavelength of 550 nm.
- the refractive index of light having a wavelength of 550 n is determined, for example, by preparing a sample film containing each component alone and
- the copolymer fine particles are not particularly limited as long as the difference in refractive index satisfies the above range, and examples thereof include (meth)acrylic acid ester, itaconic acid ester, maleic acid ester. , Vinyl esters, olefins, styrenes, (meth)acrylic amides, allyl compounds, vinyl ethers, vinyl ketones, vinyl heterocyclic compounds, unsaturated nitriles, unsaturated monomers, unsaturated carboxylic acids and It may be a copolymer containing structural units derived from two or more selected from the group consisting of polyfunctional monomers.
- Examples of (meth)acrylic acid esters include (meth)methyl acrylate, (meth)ethyl acrylate, (meth)propyl acrylate, (meth)acrylate butyl, and the like.
- Examples of gestate itaconates include dimethyl itaconate, jessyl itaconate, dipropyl itaconate and the like.
- Examples of maleates of gestate include dimethyl maleate, jessyl maleate, dipropyl maleate and the like.
- Biniruesuteru vinyl Asete _ Bok, Binirupuropione _ Bok, Binirubuchire _ Bok, Biniruisobuchire - Bok, vinyl caprolate E over preparative, vinyl chloroacetate, Binirume Tokishiase ⁇ 0 2020/175 580 18 ⁇ (: 171? 2020 /007859
- olefins include dicyclopentadiene, ethylene, propylene, 1-butene, 1-pentene, vinyl chloride, vinylidene chloride, isoprene, chloroprene, butadiene, 2,3-dimethyl butadiene and the like.
- styrenes examples include styrene, methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, isopropylstyrene, chloromethylstyrene, methoxystyrene, acetoxystyrene, chlorostyrene, dichlorostyrene, bromostyrene, trifluoromethylstyrene, Includes methyl ester of vinyl benzoate and divinylbenzene.
- Examples of (meth)acrylic amides are (meth)acrylic amide, methyl (meth)acryl amide, ethyl (meth)acrylic amide, propyl (meth)acrylic amide, butyl (meth)acrylic amide. , 6" 1:-Putyl (meth)acrylic amide, phenyl (meth)acrylic amide, dimethyl (meth)acrylic amide, methylenebisacrylic amide, etc.
- Examples of allyl compounds include allyl acetate, Examples include allyl caproate, allyl laurate, allyl benzoate, etc.
- Examples of vinyl ethers are methyl vinyl ether, butyl vinyl ether, hexyl vinyl ether, methoxetyl vinyl ether, dimethylamino. Ethyl vinyl ether, etc.
- Examples of vinyl ketones include methyl vinyl ketone, phenyl vinyl ketone, methoxetyl vinyl ketone, etc.
- Examples of vinyl heterocyclic compounds include vinyl pyridine. , 1 ⁇ 1_ vinylimidazole, 1 ⁇ 1_ vinyloxazolidone, 1 ⁇ 1_ vinyltriazole, 1 ⁇ !— vinylpyrrolidone, etc.
- Examples of unsaturated nitriles are acrylonitrile, methacrylonitrile, etc.
- unsaturated carboxylic acids include (meth)acrylic acid, itaconic acid, itaconic acid monoester, maleic acid, maleic acid monoester, etc.
- Polyfunctional compounds (crosslinkable compounds) are A compound having two or more ethylenic unsaturated bonds, examples of which include allyl (meth)acrylate, ethylenglycol di(meth)acrylate, ethyleneglycol (meth)acrylate, and triethyleneglycol. ⁇ 0 2020/175 580 19 ⁇ (: 171? 2020 /007859
- the group consisting of (meth)acrylic acid esters, vinyl esters, styrenes, and olefins is preferable.
- a copolymer containing a selected structural unit is preferable, a copolymer containing a (meth)acrylic acid ester and a structural unit derived from styrene is more preferable, and a structural unit derived from a (meth)acrylic acid ester is preferable.
- a copolymer containing a structural unit derived from styrenes and a structural unit derived from a polyfunctional monomer are more preferable.
- the glass transition temperature (c 9) of the copolymer fine particles is preferably at least 80°.
- the glass transition temperature of the copolymer fine particles (Cho 9) is the same as the above.” According to 3 ⁇ 7 1 2 1-2 0 1 2 or 8 3 1 ⁇ /1 0 3 4 1 8-8 2 Can be measured.
- the average particle diameter of the copolymer fine particles [3 ⁇ 4 1 is 0.01 to 0.4.
- the average particle size [3 ⁇ 4 1 is 0.01 or more, unevenness of an appropriate size can be formed on the surface of the obtained film, so that slipperiness is easily imparted, and when it is 0.4 or less, the film has It is easy to suppress the increase in internal haze.
- the average particle diameter 81 of the copolymer fine particles is more preferably 0.07 to 0.28.
- the average particle diameter of the copolymer fine particles [3 ⁇ 4 can be measured by the following procedure.
- the particle size is specified as the equivalent circle diameter of 100 particles obtained by 3M IV! photography. ⁇ 0 2020/175 580 20 ⁇ (: 171? 2020 /007859
- the equivalent circle diameter is calculated by converting the projected area of particles obtained by photography into the diameter of a circle with the same area. At this time, the particles observed by 3 times 1 ⁇ /1 observation with a magnification of 500 times are used to calculate the average particle size. Then, the average value of the obtained particle diameters is defined as “average particle diameter [3 ⁇ 4”].
- the coating layer is a layer containing a matrix resin formed on at least a part of the surface of the copolymer fine particles.
- the copolymer fine particles (coated fine particles) having such a coating layer are hard to aggregate in a solvent and can be highly dispersed. That is, the coating layer can function as a protective colloid.
- the coating layer further contains a crosslinked polymer containing a structural unit derived from a crosslinkable compound having two or more ethylenically unsaturated bonds (hereinafter referred to as "crosslinkable compound").
- crosslinkable compound a crosslinked polymer containing a structural unit derived from a crosslinkable compound having two or more ethylenically unsaturated bonds
- crosslinkable compound a crosslinked polymer containing a structural unit derived from a crosslinkable compound having two or more ethylenically unsaturated bonds
- the crosslinkable compound is preferably a polyfunctional (meth)acrylate compound. This is because the crosslinked polymer obtained has good affinity with the fine particles of the copolymer, has appropriate hydrophilicity derived from the oxyalkylene structure, and has good affinity with the solvent. As a result, coated fine particles in which the surfaces of the copolymer fine particles are covered with the crosslinked polymer of the crosslinkable compound are formed.
- the polyfunctional (meth)acrylate compound has an oxyalkylene structure in the molecule.
- polyfunctional (meth)acrylate compounds include ethylene glycol dimethacrylate, diethylene glycol (meth)acrylate, triethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, polyethylene glycol di(meth)acrylate. Includes acrylates and the like. Above all, from the viewpoint of making it easy to obtain an affinity with the copolymer particles, ⁇ 0 2020/175 580 21 ⁇ (: 17 2020 /007859
- the polyfunctional (meth)acrylate compound as the crosslinkable compound is preferably the same as the polyfunctional (meth)acrylate compound constituting the copolymer particles.
- the crosslinked polymer may further include a structural unit derived from another copolymerizable monomer, if necessary.
- examples of other copolymerizable monomers include monofunctional (meth)acrylate compounds such as (meth)acrylic acid methyl.
- the content of the crosslinked polymer is preferably 15 to 60 parts by mass with respect to 100 parts by mass of the copolymer fine particles.
- the content of the cross-linked polymer is 15 parts by mass or more, the affinity between the matrix resin and the fine particles of the copolymer is likely to be increased, so that the matrix resin is easily adsorbed on the surface of the fine particles of the copolymer. Thereby, the dispersibility of the copolymer fine particles is easily enhanced, and a sufficient amount of unevenness is easily formed on the surface of the obtained film.
- the content of the crosslinked polymer is 60 parts by mass or less, increase in the internal haze of the film is easily suppressed.
- the content of the crosslinked polymer is more preferably 25 to 55 parts by mass with respect to 100 parts by mass of the copolymer fine particles.
- the surface of the copolymer fine particles is covered with a coating layer of at least a certain amount. .. Specifically, when the average particle size of the coated fine particles measured by the dynamic light scattering method in the dope is 2, 2/1 is 2 ⁇
- the coating layer is not too thick, it is possible to prevent the mechanical strength (elastic modulus) of the obtained film from decreasing. Is more preferably 3 to 10 from the above viewpoint.
- R 2 /R 1 can be adjusted by the coating amount of the resin.
- the coating amount of the resin can be adjusted by, for example, In order to keep R 2 /R 1 above a certain level, in 1) the matrix resin is added to the fine particle dispersion liquid, and the dispersion solvent is selected so that the SP value satisfies the specified relationship.
- the content of the coated fine particles is preferably set such that the content of the copolymer fine particles in the matrix resin is 0.7 to 8 mass%.
- the content of the copolymer fine particles in the matrix resin is 0.7% by mass or more, a sufficient amount of unevenness is likely to be formed on the surface of the obtained film, so that the slipperiness can be sufficiently enhanced.
- the content of the copolymer fine particles with respect to the matrix resin is 8% by mass or less, it is easy to suppress an increase in the internal haze of the film.
- the content of the coated fine particles is more preferably such that the content of the copolymer fine particles in the matrix resin is 1 to 6% by mass.
- the solvent contains at least an organic solvent (good solvent) capable of dissolving the matrix resin.
- good solvents include chlorine-based organic solvents such as methylene chloride; non-chlorine-based organic solvents such as methyl acetate, ethyl acetate, acetone and tetrahydrofuran. ⁇ 0 2020/175 580 23 ⁇ (: 171? 2020 /007859
- a medium is included. Of these, methylene chloride is preferable.
- the solvent may further contain a poor solvent.
- poor solvents include the number of carbon atoms
- 1 to 4 linear or branched aliphatic alcohols are included.
- the film-like material is likely to gel and peel off from the metal support easily.
- Linear or branched aliphatic alcohols having 1 to 4 carbon atoms include methanol, ethanol, _Propanol, ⁇ 30-Propanol, Examples thereof include butanol, 360-butanol, and 6 "1: _-butanol. Of these, ethanol is preferred because of stability of the dope, relatively low boiling point, and good drying property.
- the dope may further contain a dispersion compound from the viewpoint of facilitating the dispersion of the copolymer fine particles.
- a dispersion compound examples include sugar ester compounds, cellulose diacetate, and methyl acrylate-based oligomers.
- the sugar ester compound is a compound obtained by esterifying all or part of the 0 to 1 group of a monosaccharide, a disaccharide or a trisaccharide.
- a sugar ester compound is preferably a compound represented by the following formula (8).
- Expression () Represents a substituted or unsubstituted alkylcarbonyl group or a substituted or unsubstituted arylcarbonyl group. May be the same as or different from each other. ⁇ 0 2020/175 580 24 ⁇ (: 171? 2020 /007859
- the substituted or unsubstituted alkylcarbonyl group is preferably a substituted or unsubstituted alkylcarbonyl group having 2 or more carbon atoms.
- Examples of the substituted or unsubstituted alkylcarbonyl group include methylcarbonyl group (acetyl group), ethylcarbonyl group and the like.
- Examples of the substituent which the alkyl group has include an aryl group such as a phenyl group.
- the substituted or unsubstituted arylcarbonyl group is preferably a substituted or unsubstituted arylcarbonyl group having 7 or more carbon atoms.
- the arylcarbonyl group include a phenylcarbonyl group.
- the substituent that the aryl group has include an alkyl group such as a methyl group.
- the average substitution degree of the sugar ester compound is preferably 3-6.
- the average degree of substitution of the sugar ester compound indicates the average proportion of esterified sugars out of the total number of 0 to 1 groups of the sugar as a raw material.
- the low-molecular-weight cellulose diacetate may be a compound obtained by esterifying cellulose, having a degree of acetyl group substitution equal to the total degree of acyl group substitution, and a degree of acetyl group substitution in the range of 2.0 to 2.5.
- the number average molecular weight (Mn) of low molecular weight cellulose diacetate is 100- It is preferably about 60,000.
- Mn number average molecular weight of the low molecular weight cellulose diacetate
- the number average molecular weight (Mn) of low molecular weight cellulose diacetate can be measured by high performance liquid chromatography.
- the measurement conditions are as follows.
- the methyl acrylate-based oligomer is a low molecular weight polymer containing a structural unit derived from methyl acrylate (MA).
- the content of the structural unit derived from methyl acrylate is preferably 80% by mass or more, and may be 100% by mass, based on the total structural units constituting the low molecular weight polymer.
- the methyl acrylate-based oligomer may further include a structural unit derived from another copolymerization monomer, if necessary.
- examples of such comonomers include alkyl acrylate esters other than methyl acrylate, such as methyl methacrylate (MMA) and hydroxyethyl methacrylate (HEM A). ⁇ 0 2020/175 580 26 ⁇ (: 171? 2020 /007859
- the molecular weight of the methyl acrylate-based oligomer is preferably from 200 to 100000.
- the molecular weight of the methyl acrylate-based oligomer is 200 or more, it is easy to make the compound function well as a dispersion compound, and when it is 100 or less, the dispersibility in a fine particle dispersion or dope is not easily impaired, Internal haze is also difficult to increase.
- acrylic acid oligomers such as 1001 and Daicarac 800 can be used.
- the content of the dispersion compound is 100 to 1 with respect to 100 parts by mass of the copolymer fine particles.
- the content of the dispersion compound is 100 parts by mass or more, the affinity between the matrix resin and the fine particles of the copolymer can be easily increased, so that the matrix resin can be easily adsorbed on the surface of the fine particles of the copolymer. Thereby, the dispersibility of the copolymer fine particles is easily enhanced, and a sufficient amount of unevenness is easily formed on the surface of the obtained film.
- the content of the dispersion compound is 150 parts by mass or less, it is easy to suppress the increase of the internal haze of the film. From the above viewpoint, the content of the dispersion compound is more preferably 150 to 140 parts by mass with respect to 100 parts by mass of the copolymer fine particles.
- the dope may further contain other components than the above if necessary.
- examples of other ingredients include rubber particles, UV absorbers, antioxidants and the like.
- the dope preferably further contains rubber particles in order to impart flexibility to the obtained film.
- the rubber particles are a graft copolymer containing a rubber-like polymer (crosslinked polymer)
- Examples of the rubber-like polymer include a butadiene-based cross-linked polymer and a (meth)acrylic bridge. ⁇ 0 2020/175 580 27 ⁇ (: 171? 2020 /007859
- Bridge polymers and organosiloxane cross-linked polymers are included.
- the (meth)acrylic crosslinked polymer is preferable, and the acrylic crosslinked polymer (acrylic rubbery polymer is preferable, from the viewpoint that the difference in the refractive index from the methacrylic resin is small and the transparency of the optical film is not easily impaired. ) Is more preferable.
- the rubber particles are preferably an acrylic graft copolymer containing the acrylic rubber-like polymer (3).
- the acrylic graft copolymer containing the acrylic rubber-like polymer (8) is a core-shell type particle having a core portion containing the acrylic rubber-like polymer (3) and a shell portion covering the core portion.
- the core-shell type particles are multi-stage polymers obtained by polymerizing at least one step of a monomer mixture (13) containing methacrylic acid ester as a main component in the presence of an acrylic rubber-like polymer (3). The polymerization can be carried out by an emulsion polymerization method.
- Acrylic rubber-like polymer (3) is a cross-linked polymer whose main component is acrylic acid ester.
- the acrylic rubber-like polymer (3) is a monomer mixture (3') containing an acrylate ester and an arbitrary monomer copolymerizable therewith, and one or more non-conjugated monomers per molecule. It is a cross-linked polymer obtained by polymerizing a polyfunctional monomer having a reactive double bond (radical polymerizable group).
- the acrylic rubber-like polymer (3) may be obtained by mixing and polymerizing all of these monomers, or by changing the monomer composition and performing the polymerization twice or more.
- the acrylate ester is preferably an acrylate alkyl ester having an alkyl group having 1 to 12 carbon atoms such as methyl acrylate and butyl acrylate.
- One type of acrylate ester may be used, or two or more types may be used.
- the acrylate ester preferably contains at least an alkyl acrylate having 4 to 10 carbon atoms.
- the content of the acrylic ester was 100% by mass of the monomer mixture (3'). ⁇ 0 2020/175 580 28 ⁇ (: 171? 2020 /007859
- the acrylate content is 50% by weight or more, it is easy to impart sufficient toughness to the film.
- copolymerizable monomers examples include methacrylic acid esters such as methyl methacrylate; styrenes such as styrene and methylstyrene; unsaturated nitriles such as acrylonitrile and methacrylonitrile.
- polyfunctional monomers examples include allyl (meth)acrylate, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, diallyl malate, divinyl adipate, divinylbenzene, ethylene glycol di(meth)acrylate, diethylene glycol.
- the content of the polyfunctional monomer is preferably 0.005 to 10% by mass, and 0.1 to 5% by mass based on 100% by mass of the total of the monomer mixture (3'). % Is more preferable.
- the content of the polyfunctional monomer is 0.05% by mass or more, the degree of crosslinking of the obtained acrylic rubber-like polymer (3) is likely to be increased, so that the hardness and rigidity of the obtained film are excessively impaired. If it is 10% by mass or less, the toughness of the film is not easily impaired.
- the polymer of the monomer mixture (10) is a graft component for the acrylic rubber-like polymer (3).
- the monomer mixture (well) contains methacrylic acid ester as a main component.
- Methacrylic acid ester is the number of carbon atoms of an alkyl group such as methyl methacrylate.
- methacrylic acid alkyl ester It is preferably 1 to 12 methacrylic acid alkyl ester.
- the methacrylic acid ester may be one kind or two or more kinds. ⁇ 0 2020/175 580 29 ⁇ (: 171? 2020 /007859
- the content of the methacrylic acid ester is preferably 50% by mass or more based on 100% by mass of the monomer mixture (13).
- the content of the methacrylic acid ester is 50% by mass or more, it is difficult to reduce the hardness and rigidity of the obtained film.
- the content of the methacrylic acid ester is more preferably 70% by mass or more based on 100% by mass of the monomer mixture (slave). , 80% by mass or more is more preferable.
- the monomer mixture (well) may further contain other monomers, if necessary.
- examples of other monomers include acrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, and the like; benzyl (meth)acrylate, dicyclopentanyl acrylate (meth)phenoxyene acrylate
- examples include (meth)acryl-based monomers (ring structure-containing (meth)acrylic-based monomers) having an alicyclic structure such as chill, a heterocyclic structure, or an aromatic group.
- the graft ratio (mass ratio of the graft component to the acrylic rubber-like polymer (3)) in the acrylic graft copolymer is preferably 10 to 250%, and 25 to 200%. Is more preferable, 40 to 200% is more preferable, and 60 to 150% is further preferable.
- the graft ratio is 10% or more, the ratio of the shell portion does not decrease too much, so that the hardness and rigidity of the film are not easily impaired.
- the graft ratio of the acrylic graft copolymer is 250% or less, the ratio of the acrylic rubber-like polymer (3) does not become too small, and the effect of improving the toughness and brittleness of the film is not easily impaired.
- the graft ratio of the acrylic graft copolymer is measured by the following method.
- the average particle size of the rubber particles is preferably 100 to 400 nm, 1 Is more preferable.
- the average particle size is 100 n or more, it is easy to impart sufficient toughness to the film, and When it is below, the transparency of the film is less likely to decrease.
- the glass transition temperature (9) of the rubber particles is 10°C or less.
- the glass transition temperature (Choose 9) of the rubber particles is more preferably not more than 115° and not more than 120°.
- the glass transition temperature of rubber particles (9) is measured by the same method as described above.
- the glass transition temperature of the rubber particles (9) can be adjusted by, for example, the monomer composition of the core or shell, the mass ratio of the core and shell (graft ratio), and the like.
- the carbon of the alkyl group in the monomer mixture (3') that constitutes the acrylic rubber-like polymer (3) of the core part It is preferable to increase the total mass ratio of acrylic acid ester having 4 or more atoms/copolymerizable monomer (for example, 3 or more, preferably 4 or more and 10 or less).
- the content of the rubber particles is preferably 0 to 30 mass% with respect to the matrix resin, and more preferably 2 to 20 mass%.
- the content of the rubber particles is 2% by mass or more, it is easy to impart sufficient toughness to the obtained film,
- the dope of the present invention can be produced by any method.
- the method for producing a dope of the present invention comprises, for example, 1) a step of obtaining a fine particle dispersion containing copolymer fine particles and a solvent, 2) mixing the obtained fine particle dispersion, a matrix resin and a solvent. To obtain a dope. Then, from the viewpoint of facilitating the production of coated fine particles in which the surfaces of the copolymer fine particles are coated with a resin, it is preferable to perform any one of the following methods 8 to 0.
- Method Add a matrix resin to the fine particle dispersion of step 1), Select a dispersion solvent whose values satisfy the specified relationship, and adjust the three values of the dispersion solvent, the amount of matrix resin added, or the dispersion temperature.
- the dope of the present invention comprises: 1) a step of preparing a fine particle dispersion containing a part of the matrix resin, copolymer fine particles and a first solvent, 2) the obtained fine particle dispersion, and a matrix resin And the second solvent may be mixed with the rest of the mixture to obtain a dope.
- a fine particle dispersion liquid containing a part of the matrix resin, the copolymer fine particles, and the first solvent is prepared.
- this fine particle dispersion the surface of the copolymer fine particles is covered with a part of the matrix resin.
- Such a fine particle dispersion can be obtained, for example, by mixing a part of the matrix resin, the fine particles of the copolymer, and the first solvent.
- Mixing and dispersion can be performed by any method.
- the components may be mixed by stirring with a dissolver and then dispersed with a milder disperser.
- the matrix resin is the above matrix resin.
- the copolymer fine particles are the above-mentioned copolymer fine particles.
- the first solvent may be the same as the solvent contained in the above dope. ⁇ 0 2020/175 580 32 ⁇ (: 17 2020 /007859
- Formula (1) is obtained by combining the first solvent and the matrix resin or copolymer fine particles Means small. Thereby, the affinity between the copolymer particles and the first solvent and the affinity between the matrix resin and the first solvent can be increased.
- the ternary value of each component can be calculated from its chemical structure by using a commercially available image analysis software, for example, 30 I 9 "63 33.
- the dispersion solvent contains two or more kinds of solvents. In this case, it can be calculated as the sum of the squares of the three values of each solvent multiplied by the content ratio (mass %) (that is, the root mean square).
- the fine particle dispersion liquid preferably satisfies at least one of the following requirements ( ⁇ ) to ( ⁇ ).
- the content of matrix resin in the fine particle dispersion is 165 parts by mass or more based on 100 parts by mass of the copolymer fine particles.
- the temperature when preparing the fine particle dispersion is 40 ° ⁇ or more
- the requirement () indicates that the first solvent has high hydrophobicity.
- the affinity between the copolymer fine particles or the matrix resin and the first solvent becomes higher, so that the copolymer fine particles are likely to be stably dispersed in the first solvent in which the matrix resin is dissolved. This makes it easier for the matrix resin to adhere to the surface of the copolymer particles.
- the first solvent such that 31 is 16.5 or less includes at least a solvent in which 31 is 16.5 or less, or a highly polar solvent having a relatively high 3 value (preferably And a low-polarity solvent having a relatively low 3 value (preferably a solvent having a 3 value of 18 or less).
- a highly polar solvent having a relatively high 3 value preferably ethanol having a 3 value of 18 or less
- a low-polarity solvent having a relatively low 3 value preferably a solvent having a 3 value of 18 or less.
- highly polar solvents include ethanol (3 value: 25.2) and methylene chloride (3 value: 19.4).
- low-polarity solvents include diethyl ether (3 values: 1 5 1), carbon tetrachloride (3 values: 17.6), cyclohexane (3 values: 16.8).
- the requirement ( ⁇ ) is that the content of the matrix resin in the fine particle dispersion is moderately large, so that the matrix resin can be easily attached to the surface of the copolymer particles.
- the content of the matrix resin in the fine particle dispersion is more preferably 150 to 500 parts by mass, and even more preferably 165 to 400 parts by mass with respect to 100 parts by mass of the copolymer particles.
- the requirement ( ⁇ ) is that the particles are heated when they are prepared. Specifically, it is heated to 40° or more, preferably 40 to 80°. This can promote the adhesion of the matrix resin to the surface of the copolymer particles.
- Two or more of I) may be combined.
- Step 2) ⁇ 0 2020/175 580 34 ⁇ (: 171? 2020 /007859
- the fine particle dispersion obtained in 1) above, the rest of the matrix resin, and the second solvent are mixed to obtain a dope.
- the same solvent as the solvent contained in the dope can be used.
- the compositions of the second solvent and the first solvent may be the same or different.
- Mixing can be performed in, for example, a melting pot.
- the matrix resin can be further attached to the surface of the copolymer particles.
- the dope of the present invention comprises: 1) a step of preparing a fine particle dispersion liquid containing copolymer fine particles, a dispersion compound, and a solvent, and 2) mixing the fine particle dispersion liquid, a matrix resin, and a solvent. And may be manufactured through a step of obtaining a dope.
- a fine particle dispersion containing copolymer fine particles, a dispersion compound, and a solvent is prepared. Specifically, the copolymer fine particles, the dispersion compound, and the solvent can be mixed to obtain a fine particle dispersion liquid.
- the dispersion compound is the above dispersion compound.
- the content of the dispersion compound is as described above.
- the obtained fine particle dispersion, the matrix resin, and the solvent are mixed to obtain a dope.
- the matrix resin can be further adhered to the surface of the copolymer fine particles also in this step.
- the surface of the copolymer fine particles can be sufficiently covered (or protected) with the coating layer, so that the dispersion stability can be highly enhanced.
- the dope of the present invention comprises: 1) preparing a fine particle dispersion containing copolymer fine particles and a solvent; and 0 2) mixing the fine particle dispersion, a matrix resin, and a solvent to form a dope.
- the fine particle dispersion liquid in the step of 0 1) contains a crosslinking compound, or that the crosslinking compound is further mixed in the step of 0 2). This facilitates formation of a crosslinked polymer of a crosslinkable compound on the surface of the copolymer fine particles and also facilitates localization of affinity with the matrix resin.
- the crosslinkable compound is the above-mentioned crosslinkable compound.
- the mixing and dispersion in the step 0 1) or the mixing and dispersion in the step 0 2) is, for example, 40°C or more, preferably Is preferably heated to 50 to 800°.
- the amount of the crosslinkable compound added is 50 to 1 with respect to 100 parts by mass of the copolymer fine particles.
- the amount of the crosslinkable compound added is more preferably 150 to 140 parts by mass with respect to 100 parts by mass of the copolymer fine particles.
- the method for producing an optical film of the present invention is preferably a solution casting method (casting method) from the viewpoint that a resin having a relatively high molecular weight can be used and there are few restrictions on the materials that can be used.
- the optical film of the present invention comprises: 1) a step of preparing the above-mentioned dope for the optical film; and 2) casting the obtained dope on a support, drying and peeling the film to obtain a film-like material. Can be manufactured through the process of obtaining.
- the method for producing an optical film of the present invention further comprises the steps of 3) further drying the obtained film-like product, and 4) winding the obtained film-like product to obtain a mouth-shaped optical film.
- the dope for the above-mentioned optical film is prepared. Specifically, the dope can be obtained by the method for producing the dope, that is, any one of the methods 8 to 0.
- the obtained dope is cast on a support.
- the casting of the dope can be performed by discharging from the casting die.
- the residual solvent amount of the dope when peeled from the support is, for example, preferably 25% by mass or more, and 30 to 37% by mass. It is more preferable that the amount is 30 to 35% by mass.
- the amount of residual solvent at the time of peeling is 25% by mass or more, the solvent is likely to be volatilized at once from the film-form material after peeling. Further, when the residual solvent amount at the time of peeling is 37% by mass or less, it is possible to prevent the film-like material from peeling too much due to peeling.
- the residual solvent amount of the dope at the time of peeling is defined by the following formula. The same applies below.
- Residual amount of dope (mass before heat treatment of dope-mass after heat treatment of dope) / mass after heat treatment of dope X 1 ⁇ ⁇
- the heat treatment during determination of the residual solvent amount refers to heating treatment of 1 4 0 ° ⁇ 1 5 minutes.
- the amount of residual solvent at the time of peeling can be adjusted by the drying temperature and drying time of the dope on the support, the temperature of the support, and the like.
- the obtained film-like material is dried.
- the drying may be performed in one step or in multiple steps.
- the drying may be performed while stretching if necessary. ⁇ 0 2020/175 580 37 ⁇ (: 171? 2020 /007859
- Stretching may be performed depending on the required optical characteristics, and stretching in at least one direction is preferable, and stretching is performed in two directions orthogonal to each other (for example, the width direction of the film (the direction 0)). , And may be biaxially stretched in the conveying direction (IV! 0 direction) orthogonal thereto.
- the stretching ratio can be 1.01-2 times from the viewpoint of using the optical film as a retardation film for I3, for example.
- the stretching ratio is defined as (the size of the film after stretching in the stretching direction)/(the size of the film before stretching in the stretching direction).
- the in-plane slow axis direction of the optical film (the direction in which the refractive index is maximum in the plane) is usually the direction in which the draw ratio is maximum.
- the drying temperature (stretching temperature) during stretching is (Cing 9-65) ° ⁇ to (Cing 9 + 60) ° ⁇ when the glass transition temperature of the thermoplastic resin is C9. is ° ⁇ - (Ding 9 + 5 0) ° ⁇ preferably, (Ding 9 - - 5 0) ° ⁇ ⁇ more preferably (Ding 9 + 5 0) ° is ⁇ , (3 0 Ding 9) Is more preferable.
- the stretching temperature is (Cho 9-65) ° ⁇ or more, the solvent is easily volatilized appropriately, so that the stretching tension can be easily adjusted to an appropriate range, and it is (Cho 9 + 60) ° ⁇ or less. Since the solvent does not volatilize too much, stretchability is not easily impaired.
- the thermoplastic resin is a (meth)acrylic resin
- the stretching temperature can be, for example, 90 ° or more.
- the stretching temperature is (3) when drying with a non-contact heating type such as a tenter stretching machine, ambient temperature such as the temperature inside the stretching machine or hot air temperature, (13) contact with a hot mouth
- a non-contact heating type such as a tenter stretching machine
- ambient temperature such as the temperature inside the stretching machine or hot air temperature
- it can be measured as either the temperature of the contact heating part or the surface temperature of the ( ⁇ ) film material (surface to be dried).
- the ambient temperature such as the temperature inside the stretching machine or the hot air temperature.
- the amount of residual solvent in the film at the start of stretching is preferably approximately the same as the amount of residual solvent in the film at the time of peeling, for example, 20 to 30 mass% is preferable. More preferably, it is more preferably from 25 to 30 mass %. ⁇ 0 2020/175 580 38 ⁇ (: 171? 2020 /007859
- Stretching of the film-like material in the zero direction (width direction) is performed by, for example, fixing both ends of the film-like material with clips or pins and widening the interval between the clips or pins in the traveling direction (tenter method).
- the stretching in the direction can be performed by, for example, a method of making a peripheral speed difference between a plurality of rolls and utilizing the peripheral speed difference between them (a roll method).
- the film-like material obtained after stretching is further dried while being transported (in a state in which a constant tension is applied) by a mouth or the like.
- the drying temperature at this time (the drying temperature when not stretching or the drying temperature after stretching) is (Cing 9 — 30) to (Cing 9 + It is preferably 30) ° ⁇ , and more preferably (Cho 9-20) to 9 ⁇ ° . If the drying temperature is (Ding 9 _ 30) ° ⁇ or higher, preferably (Ding 9 — 20) ° ⁇ or higher, the rate of volatilization of the solvent from the stretched film can be easily increased, so that the drying efficiency is improved. Easy to raise.
- the drying temperature is (Cho 9 + 30) ° or less, preferably 9 ° or less, galvanic deformation due to stretching of the film can be highly suppressed.
- the ambient temperature such as (3) the temperature inside the stretching machine or the hot air temperature, as described above.
- the obtained optical film is wound in a lengthwise direction of the film (direction perpendicular to the width direction) using a winding machine.
- a winding machine As a result, an optical film wound around the winding core in a mouth shape, that is, a mouth ring of the optical film can be obtained.
- the winding method is not particularly limited and may be a constant torque method, a constant tension method, a taper-tension method, or the like.
- the winding tension when the optical film is wound may be about 50 to 1701 ⁇ 1.
- the winding length is not particularly limited, and may be 300 or more, preferably 350 to 800. In this way, the longer the winding length, ⁇ 0 2020/175 580 39 ⁇ (: 17 2020 /007859
- the obtained optical film has good slipperiness. Therefore, for example, even if surface treatment such as anti-blocking coating layer is not applied, co-casting to form a laminated structure to localize fine particles on the surface layer, or protect film is not placed between films, Adhesion between them can be suppressed well.
- the optical film thus obtained is used as an optical member in a display device such as a liquid crystal display device or an organic semiconductor display device.
- the optical member include a polarizing plate protective film (including a retardation film and a brightness enhancement film), a transparent substrate, and a light diffusion film.
- the optical film of the present invention is preferably used as a polarizing plate protective film.
- the optical film of the present invention is obtained by the above method for producing an optical film, and contains a matrix resin and copolymer fine particles.
- the matrix resin is the above matrix resin.
- the copolymer fine particles are the above-mentioned copolymer fine particles. That is, the average particle diameter 81' of the copolymer fine particles in the optical film is preferably 0.01 to 0.4, and more preferably 0.07 to 0.28.
- the average particle diameter [[1'] of the copolymer fine particles in the optical film can be measured by the following method. First, the optical film is cut, and the cut surface obtained is observed IV. Then, the particle diameter of 100 particles of arbitrary particles is measured. The particle size is measured as the equivalent circle diameter of 100 particles obtained by photographing 1//1 as described above. Then, the average value of the obtained particle diameters is defined as “average particle diameter [3 ⁇ 4 1, ”. It should be noted that, in the image of Tingmi IV!, the part where the brightness is more than the average brightness X 150% of the visual field is judged as a particle.
- the copolymer fine particles are ⁇ 0 2020/175 580 40 ⁇ (: 171? 2020 /007859
- the average particle diameter [3 ⁇ 4 1'of the copolymer fine particles in the optical film corresponds to the average particle diameter [3 ⁇ 4 1 of the copolymer fine particles measured from the dope (almost the same).
- the average particle diameter [3 ⁇ 4 2'of the coated fine particles measured by dissolving the optical film in a solvent corresponds to the average particle diameter [3 ⁇ 4 2 of the coated fine particles in the dope (almost the same)]. That is, 2'/[3 ⁇ 41' of the optical film corresponds to that of the dope (almost the same).
- the content of the matrix resin is preferably 60% by mass or more, more preferably 70% by mass or more, and 80% by mass or more with respect to the optical film. More preferable.
- the composition of the optical film is the same as the solid content composition of the above dope. Therefore, the content of the copolymer fine particles is preferably 0.7 to 8 mass% with respect to the matrix resin.
- the content of the copolymer fine particles is 0.7% by mass or more, it is easy to form a sufficient amount of irregularities on the surface of the optical film, and thus the slipperiness can be sufficiently enhanced, and when the content is 8% by mass or less. If so, it is easy to suppress an increase in internal haze of the optical film.
- the content of the copolymer fine particles is more preferably 1 to 6 mass% with respect to the matrix resin.
- the optical film may further contain the above dispersion compound or the above crosslinked polymer.
- the optical film may further contain other components such as the above rubber particles. Further, the optical film may further contain a residual solvent and the like.
- the optical film is produced by the solution casting method as described below, it may contain a residual solvent derived from the solvent of the dope used in the solution casting method.
- the residual solvent amount with respect to the optical film is preferably 700 or less, and more preferably 30 to 700.
- the content of the residual solvent can be adjusted by the drying conditions of the dope cast on the support in the optical film production process described later.
- the residual solvent amount of the optical film can be measured by a headspace gas chromatography.
- the sample is sealed in a container, heated, and the gas in the container is quickly injected into the gas chromatograph while the container is filled with volatile components, and mass spectrometry is performed. Volatile components are quantified while performing identification.
- the headspace method makes it possible to observe all peaks of volatile components by gas chromatography, and by using an analysis method that utilizes electromagnetic interactions, it is possible to detect volatile substances with high accuracy. Quantification of monomers and the like can also be performed together.
- the optical film preferably has high transparency.
- the haze of the optical film is preferably 0.03% or less, more preferably 0.02% or less, and particularly preferably 0.01% or less. Internal haze is the sample
- the internal haze of the optical film depends on the content of the copolymer particles or 2'/[3 ⁇ 4 1'(or Can be adjusted by.
- the content of the copolymer particles is preferably below a certain level, / [3 ⁇ 4 1'is preferably a certain value or more (2 or more, preferably 3 or more).
- the tensile elastic modulus of the optical film is preferably 1 8001 ⁇ /1 3 or more.
- the tensile elastic modulus of the optical film is 1 8001 ⁇ /13 or more, it is easy to suppress the sticking of the optical films to each other, and thus it is easy to suppress the sticking failure.
- the tensile elastic modulus of the optical film is more preferably 1 800 to 50001 ⁇ /13.
- the tensile modulus of the optical film is /[3 ⁇ 4 1'(or Can be adjusted according to To keep the tensile modulus of the optical film above a certain level, for example, It is preferable that /[3 ⁇ 4 1'is less than a certain value (less than 10).
- the tensile modulus of the optical film can be measured in accordance with "3 ⁇ 71 27,” using Tensilon 001 1225 8 manufactured by Orient Tech. Measurement conditions are 23°C, 50%RH, chuck distance 5 Can be
- the retardation in the in-plane direction 80 measured under the environment of measurement wavelength 550 nm and 23 ° C 55%RH is ⁇ to 101. ⁇ ! is preferable, and ⁇ to 50,000! is more preferable.
- the phase difference in the thickness direction of the optical film is 1: 20 to 20 n Is preferred, and 10 to 10 n Is more preferred.
- the father expresses the refractive index in the in-plane slow axis direction (direction in which the refractive index is maximum) of the film,
- V represents the refractive index in the direction orthogonal to the in-plane slow axis of the film
- ⁇ represents the refractive index in the thickness direction of the film
- d represents the film thickness (nm).
- the in-plane slow axis of the optical film is an axis having the maximum refractive index on the film surface.
- the in-plane slow axis of the optical film can be confirmed by an automatic birefringence meter AXOSCAN (AXO Sca n Mu e l l e r Ma t r i x P o l a r i m i t e r: manufactured by Axometrics).
- R ⁇ and Rt can be measured by the following method.
- the retardations RO and Rt of the optical film can be adjusted by, for example, the type of matrix resin and the stretching conditions.
- a matrix resin that does not easily give a retardation by stretching is selected (for example, a structural unit derived from a monomer having negative birefringence and a positive birefringence are selected). It is preferable to select a resin having a monomer ratio capable of canceling the retardation with the structural unit derived from the monomer).
- the thickness of the optical film is, for example, 5 to 1OO ⁇ m, preferably
- the polarizing plate of the present invention has a polarizer, the optical film of the present invention, and an adhesive layer arranged between them.
- a polarizer is a polyvinyl alcohol-based polarizing film, which is an element that allows only light with a plane of polarization in a certain direction to pass through.
- Polyvinyl alcohol type polarizing film ⁇ 02020/175580 44 ⁇ (: 171? 2020 /007859
- a polyvinyl alcohol-based polarizing film is a film obtained by uniaxially stretching a polyvinyl alcohol-based film and then dyeing it with iodine or a dichroic dye (preferably a film further subjected to a durability treatment with a boron compound). It may be a film obtained by dying a polyvinyl alcohol film with iodine or a dichroic dye and then uniaxially stretching it (preferably a film further subjected to a durability treatment with a boron compound).
- the absorption axis of the polarizer is usually parallel to the maximum stretching direction.
- JP 2003-248123 A JP 2003-34232
- An ethylene-modified polyvinyl alcohol having an ethylene unit content of 1 to 4 mol%, a degree of polymerization of 2000 to 4000, and a degree of saponification of 99.0 to 99.99 mol% as described in JP-A No. 2-9 is used.
- the thickness of the polarizer is preferably 5 to 30 and more preferably 5 to 20 in order to make the polarizing plate thin.
- the optical film of the present invention is arranged on at least one surface of the polarizer (at least the surface facing the liquid crystal cell).
- the optical film can function as a polarizing plate protective film.
- optical film of the present invention When the optical film of the present invention is arranged on only one surface of the polarizer, another optical film may be arranged on the other surface of the polarizer.
- other optical films include commercially available cellulose ester films (for example, Konica Minolta Tack ⁇ 811 ⁇ , ⁇ 511 ⁇ , [ ⁇ ⁇ 411 ⁇ ,
- the thickness of the other optical film is, for example, 5 to 100 Mm, preferably 40 to 8
- the adhesive layer is arranged between the optical film (or another optical film) and the polarizer.
- the thickness of the adhesive layer may be, for example, about 0.01 to 1 O ⁇ m, preferably about 0.03 to 5 Mm.
- the polarizing plate of the present invention can be obtained by laminating the polarizer and the optical film of the present invention via an adhesive.
- the adhesive may be a completely saponified aqueous solution of polyvinyl alcohol (water glue) or an active energy ray-curable adhesive.
- the active energy ray-curable adhesive may be a photoradical polymerization type composition utilizing photoradical polymerization, a photocationic polymerization type composition utilizing photocationic polymerization, or a combination thereof.
- the liquid crystal display device of the present invention includes: a liquid crystal cell, a first polarizing plate disposed on one surface of the liquid crystal cell, and a second polarizing plate disposed on the other surface of the liquid crystal cell.
- the display mode of the liquid crystal cell is, for example, STN (Super-Twisted Nematic), T N
- VA Very AUgnment
- MVA Memt i-domai n Vertical Alignment
- PVA Pulned Vertical Alignment
- IPS In-Plane -Switching
- One or both of the first and second polarizing plates is the polarizing plate of the present invention.
- the polarizing plate of the present invention is preferably arranged such that the optical film of the present invention is on the liquid crystal cell side.
- Resin A G 781 0 manufactured by JSR (cycloolefin resin containing a structural unit represented by the formula (B-2), refractive index 1.51, weight average molecular weight 14,000, glass transition temperature 1 70° ⁇
- Resin C Cellulose acetate probionate (acetyl group substitution degree 1.5 / propionyl group substitution degree 0.9 / total substitution degree 2.4 cellulose acylate, refractive index 1.48, weight average molecular weight 200,000, glass transition temperature 1 80 °C)
- a film made of the above resin was prepared, and the refractive index of the film at a wavelength of 550 nm was measured using a Horiba spectroscopic ellipsometer _U VS EL.
- the glass transition temperature of the resin was measured according to JI S K 7 1 2 1 -201 2 using DSC (Diff er e n t i a l S c a n n i n g Co l o r i m t r y: differential scanning calorimetry).
- the weight average molecular weight (Mw) of the resin was measured by gel permeation chromatography (Tosoh HLC 8220 G PC), column (Tosoh TS K-GE LG 6 000 HXL-G 5000 HXL-G 5000 HXL-G 4000 HXL). -G 3000 HXL in series). 20 ⁇ 0.5 mg of the sample was dissolved in 10 ml of tetrahydrofuran and filtered through a 0.45 mm filter. ⁇ 02020/175580 47 ⁇ (: 171? 2020 /007859
- This solution was injected into a column (temperature of 40 ° ) at 100 ° C, measured at a detector temperature of 40, and converted into styrene to obtain a weight average molecular weight.
- Fine particles 1 Methyl methacrylate (1 ⁇ /11 ⁇ /1/8)/Styrene (31:)/Ethylene glycol dimethacrylate (Mix 001 ⁇ /1/8) Copolymer particles (refractive index 1.5 1, Average particle size ⁇ 0.14)
- Fine particles 2 Petroleum acrylate (Minhachi) / Styrene (31) / Ethylene glycol dimethacrylate (Min*01 ⁇ /18) Copolymer particles (refractive index 1.48, average particle size ⁇ .18)
- Fine particles 8 Silica particles (refractive index 1.45, average particle diameter 0.15) The refractive index of the fine particles was measured by the same method as described above.
- Dispersion compound Methyl acrylate oligomer represented by the following formula ⁇ 02020/175 580 48 ⁇ (: 17 2020 /007859
- Dispersion compound 0 low molecular weight diacetyl cellulose (number average molecular weight M n : 2000, degree of acetyl substitution (total degree of acyl group substitution): 2.4)
- Fine particles 8 1:1 parts by mass
- Resin eight (matrix resin): 3 parts by mass
- a dope having the following composition was prepared. First, methylene chloride was added to the pressure dissolution tank, and then resin 8 (matrix resin) was added while stirring. Then, the above-prepared fine particle dispersion was further added thereto, heated to 60 ° and completely dissolved with stirring. The heating temperature was raised from room temperature to 5 ° ⁇ /111I, dissolved in 30 minutes, and then lowered to 3°0/
- Resin eight 100 parts by mass
- Fine particle dispersion 1:1 50 parts by mass
- the obtained dope was uniformly cast on a stainless belt support of an endless belt casting device.
- the temperature of the stainless belt is 28 ° ⁇
- the transport speed of the stainless belt is 20 ⁇ !/ ⁇ ! ⁇
- the solvent was evaporated on the stainless belt support until the residual solvent amount in the cast film material became 25% by mass, and then the solvent was removed from the stainless belt support to remove the film material.
- Fine particles were prepared in the same manner as Fine Particle Dispersion 1 except that the composition was changed to ⁇ 0 2020/175 580 50 ⁇ (: 171? 2020 /007859
- Dispersion liquid 2 was obtained.
- Dope 2 was obtained in the same manner as dope 1 except that the obtained fine particle dispersion 2 was used.
- An optical film 102 was obtained in the same manner as the optical film 101 except that the obtained dope 2 was used.
- Fine Particle Dispersion Liquid 3 was obtained in the same manner as Fine Particle Dispersion Liquid 2 except that the following composition was changed.
- a dope 3 was obtained in the same manner as the dope 2 except that the composition was changed to the following: Resin: 100 parts by mass
- Fine particle dispersion 3 50 parts by mass
- An optical film 103 was obtained in the same manner as the optical film 102 except that the obtained dope 3 was used.
- Fine Particle Dispersion Liquid 4 was obtained in the same manner as Fine Particle Dispersion Liquid 1 except that the following composition was changed. ⁇ 0 2020/175 580 51 ⁇ (: 171? 2020 /007859
- a dope 4 was obtained in the same manner as the dope 3 except that the obtained fine particle dispersion liquid 4 was used.
- An optical film 104 was obtained in the same manner as the optical film 103 except that the obtained dope 4 was used.
- An optical film 120 was obtained in the same manner as in the optical film 104 except that the resin was changed to 4.5 parts by mass in the preparation of the fine particle dispersion liquid 4.
- An optical film was obtained in the same manner as the optical film 104, except that the composition of the dispersion solvent of the fine particle dispersion and the resin concentration of the dope were changed as shown in Table 1.
- An optical film was obtained in the same manner as the optical film 104, except that the resin content of the fine particle dispersion was changed as shown in Table 1.
- An optical film was obtained in the same manner as the optical film 11 1 except that the content of the fine particles in the fine particle dispersion was changed as shown in Table 1.
- optical film was obtained in the same manner as the optical film 1 1 1 except that the type of matrix resin was changed as shown in Table 1 and the amount of rubber particles shown in Table 1 was further added.
- An optical film was obtained in the same manner as the optical film 11 1 except that the composition of the dispersion solvent of the fine particle dispersion was changed as shown in Table 1.
- Optical films 1 17 and 1 18 were obtained in the same manner as optical film 104, except that the temperature (dispersion temperature) for preparing the fine particle dispersion was changed as shown in Table 1. Further, an optical film 1 19 was obtained in the same manner as the optical film 1 14 except that the temperature for preparing the fine particle dispersion was changed as shown in Table 1.
- the average particle size of the (1-1) fine particles 1, the average particle size 2 of the (1-2) coated fine particles, and the average particle size 3 of the (1 -3) dispersion solvent were measured by the following method.
- the average particle size [1] of the fine particles was measured by the following procedure.
- the obtained dope was diluted about 5 times with the main solvent (the solvent with the highest content) of each dope so that the resin concentration was 20% by mass.
- the average particle size [3 ⁇ 4 2 of the coated fine particles is measured by the dynamic light scattering method, specifically, using the zeta potential-particle size ⁇ Molecular weight measurement system, !_32_200023, from the scattered light caused by the Brownian motion of the particles. did.
- each component was calculated from the chemical structure using commercially available image analysis software 3 0 9 "633.
- each solvent is as described above. It was calculated as the sum (that is, the root mean square) of the squares of the three values of x multiplied by the content ratio (% by mass).
- the average particle diameter of the (2-1) fine particles [3 ⁇ 4 1', (2-2) the average particle diameter of the coated fine particles [3 ⁇ 4 2', and (2-3) The elastic modulus was measured by the following method. ⁇ 02020/175580 53 ⁇ (: 171? 2020 /007859
- the obtained optical film was cut, and the cut surface was observed with a cross section IV!. Then, the circle-equivalent diameters of the particle diameters of 100 arbitrary particles were measured, and the average value thereof was defined as "average particle diameter [3 ⁇ 4'".
- the average particle diameter [3 ⁇ 4'] of the fine particles in the obtained solution was measured in the same manner as in the above (1-2).
- the tensile modulus of elasticity of the obtained optical film was measured in accordance with "3 ⁇ 71 27" using Tensilon 001 1225 8 manufactured by Orientec. Measurement conditions: 23°C, 50%RH, chuck distance did.
- the optical film was cut into a predetermined size to obtain two films.
- One surface (eight surfaces) of one film was brought into contact with the other surface (middle surface) of the other film, and a load of 6 IV! 8 was applied for 30 minutes. After that, the load was removed, and the ratio of the area of the stuck portion to the total area of the portion to which the load was applied (sticking area ratio) was measured by image analysis software.
- the length of the part of the optical film where sticking occurred (IV! 0 direction length) was defined as the “sticking failure length”.
- the length of the optical film that was formed from the start of film formation to the time when cleaning of the belt was required due to the removal of fine particles was defined as the “production length”.
- Table 1 shows the doping configuration, the film configuration, and the evaluation results used for the optical films 1 0 to 1 2 0.
- dopes 5 to 19 obtained by using a fine particle dispersion liquid containing a resin and having a composition of a dispersion solvent satisfying the above-mentioned formula (1) have 2/1. ⁇ 0 2020/175 580 56 ⁇ (: 171? 2020 /007859
- Dope 4 and 36 using liquid are both
- optical films 101 to 104 and 120 all have a high internal haze and a sticking failure occurs.
- a fine particle dispersion liquid was prepared in the same manner as the fine particle dispersion liquid 3, except that the composition of the fine particle dispersion liquid was changed as follows.
- Dispersion compound 10 parts by mass
- An optical film 201 was obtained in the same manner as the optical film 103, except that the obtained fine particle dispersion liquid was used.
- An optical film was obtained in the same manner as the optical film 201 except that the content of the dispersion compound was changed as shown in Table 2.
- An optical film was obtained in the same manner as the optical film 201 except that the content of the fine particles was changed as shown in Table 2.
- the optical fiber was changed except that the type of matrix resin was changed as shown in Table 2. ⁇ 0 2020/175 580 57 ⁇ (: 171? 2020 /007859
- An optical film was obtained in the same manner as the optical film 202 except that the kind and content of the dispersion compound were changed as shown in Table 2.
- the average particle diameter of the (1-1) fine particles [3 ⁇ 4 1 and the average particle diameter of the (1_2) coated fine particles 82 was It measured similarly to the above.
- the average particle diameter of the (2-1) fine particles [3 ⁇ 4 1'and the average particle diameter of the (2-2) coated fine particles [3 ⁇ 4 2' It measured similarly to.
- the internal haze, sticking failure (sticking area, length of failed part), and production length of the obtained optical films 201 to 210 were evaluated in the same manner as described above.
- Table 2 shows the dope structure, film structure and evaluation results used for the optical films 201 to 210. For comparison, Table 2 also shows the dope structure, film structure and evaluation results of the optical film 103.
- the fine particles were well dispersed. It can be seen that the obtained optical films 201 to 203 and 205 to 210 all have a low internal haze and a sticking failure is suppressed.
- the obtained optical film 103 has a high internal haze and causes a sticking failure.
- the dope 23 using the fine particle dispersion liquid in which the content of the dispersion compound is too large is
- the obtained optical film 204 has a low internal haze, but has a low tensile elastic modulus and a marked decrease in the film strength. It can be seen that this causes a sticking failure.
- a fine particle dispersion liquid was prepared in the same manner as the fine particle dispersion liquid 3, except that the composition of the fine particle dispersion liquid was changed as follows.
- the optical fiber was changed except that the type of matrix resin was changed as shown in Table 3. ⁇ 0 2020/175 580 60 ⁇ (: 171? 2020 /007859
- the average particle diameter of the (2-1) fine particles [3 ⁇ 4 1', and the average particle diameter of the (2-2) coated fine particles [3 ⁇ 4 2' It measured similarly to.
- the internal haze, sticking failure (sticking area, length of failed part), and production length of the obtained optical films 301 to 306 were evaluated by the same method as described above.
- Table 3 shows the dope constitution, film constitution and evaluation results used for the optical films 301 to 306. For comparison, Table 3 also shows the dope structure, film structure and evaluation results of the optical film 103.
- Dope 30-32, 34 and 35 are Is adjusted within a predetermined range, and it can be seen that the fine particles are well dispersed. It can be seen that the obtained optical films 301 to 303, 305 and 306 all have a low internal haze and the sticking failure is suppressed.
- the obtained optical film 103 has a high internal haze and causes a sticking failure.
- the dope 33 using the fine particle dispersion having an excessively large content of the crosslinkable compound is The obtained optical film 304 has a low internal haze, but the bow I tensile elastic modulus is low, and the strength of the film is remarkably reduced. As a result, it can be seen that sticking failure occurs.
- a dope capable of imparting an optical film having sufficient slipperiness that can suppress sticking failure when wound in a roll shape, for example, without increasing internal haze. It is possible to provide an optical film obtained by using the above, a method for producing the optical film, and a polarizing plate.
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- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
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