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WO2010116830A1 - Film optique - Google Patents

Film optique Download PDF

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Publication number
WO2010116830A1
WO2010116830A1 PCT/JP2010/053641 JP2010053641W WO2010116830A1 WO 2010116830 A1 WO2010116830 A1 WO 2010116830A1 JP 2010053641 W JP2010053641 W JP 2010053641W WO 2010116830 A1 WO2010116830 A1 WO 2010116830A1
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WO
WIPO (PCT)
Prior art keywords
optical film
resin
cellulose ester
film
acrylic resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2010/053641
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English (en)
Japanese (ja)
Inventor
正高 瀧本
伸夫 久保
隆 建部
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Konica Minolta Opto Inc
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Konica Minolta Opto Inc
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Publication date
Application filed by Konica Minolta Opto Inc filed Critical Konica Minolta Opto Inc
Priority to JP2011508285A priority Critical patent/JPWO2010116830A1/ja
Publication of WO2010116830A1 publication Critical patent/WO2010116830A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • 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
    • G02B1/105—
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials

Definitions

  • the present invention relates to an optical film, and more particularly to an optical film having a low hygroscopic property, transparency, high heat resistance, and markedly improved brittleness by blending a specific acrylic resin and a cellulose ester resin.
  • a liquid crystal display device is composed of a liquid crystal cell in which a transparent electrode, a liquid crystal layer, a color filter, etc. are sandwiched between glass plates, and two polarizing plates provided on both sides thereof.
  • the optical element polarizing plate protective film
  • a child also referred to as a polarizing film or a polarizing film.
  • a cellulose triacetate film is usually used as this polarizing plate protective film.
  • liquid crystal display devices Due to recent technological advances, the enlargement of liquid crystal display devices has accelerated, and the applications of liquid crystal display devices have diversified. For example, it can be used as a large display installed on a street or in a store, or used as an advertising display in a public place using a display device called digital signage.
  • PMMA polymethyl methacrylate
  • liquid crystal display device As the liquid crystal display device is enlarged as described above, and the applications to the outdoors are expanded, it is necessary to increase the amount of light of the backlight so that the image can be fully recognized even outdoors. It was used under harsh conditions, and heat resistance at high temperatures and longer-term heat resistance were required.
  • the PMMA film has poor heat resistance and has a problem that its shape changes when used at high temperatures or for long-term use.
  • This problem was an important issue not only as a physical property of a single film but also in a polarizing plate and a display device using such a film. That is, in the liquid crystal display device, the polarizing plate curls as the film is deformed, causing a problem that the entire panel is warped.
  • the problem due to film deformation is also a problem on the backlight side, but when used at the position on the viewing side surface, the design phase difference changes due to deformation, so the viewing angle changes and the color changes. The problem arises.
  • the acrylic resin film is fragile and brittle when compared with a cellulose ester film and the like, and is difficult to handle. In particular, it is difficult to stably produce an optical film for a large liquid crystal display device. It was.
  • PMMA resin often contains methyl methacrylate monomer, but since methyl methacrylate monomer has sensitization, there is also a recent increase in environmental consciousness, and methyl methacrylate monomer is added to the film produced using PMMA resin. Is not preferable if it is contained in a large amount.
  • PC polycarbonate
  • Other methods for improving heat resistance include a method of introducing an alicyclic alkyl group as a copolymer component of an acrylic resin, a method of forming a cyclic structure in a molecular main chain by intramolecular cyclization reaction, etc. (For example, refer to Patent Documents 2 and 3).
  • the film is not sufficiently brittle, and it is difficult to produce an optical film used for a large-sized liquid crystal display device.
  • the brittleness is insufficient, the optical film promotes the deformation of the panel, and consequently the change in the phase difference cannot be suppressed, and the problem of the change in the viewing angle and the change in the color tone also occurs.
  • Patent Document 4 As a technique for improving moisture resistance and heat resistance, a resin in which an acrylic resin is combined with an impact-resistant acrylic rubber-methyl methacrylate copolymer or butyl-modified acetylcellulose has been proposed (see, for example, Patent Document 4).
  • an optical film using an acrylic resin may be manufactured by a melt film forming method, but in the melt film forming method, the methyl methacrylate monomer in the acrylic resin is contained as it is in the film.
  • the resin must be heated to a high temperature in order to melt the resin, and there is a concern that the resin is decomposed by this heat and the methyl methacrylate monomer is increased.
  • the acrylic resin is not added to such an extent that the moisture resistance can be sufficiently improved, so that sufficient moisture resistance cannot be obtained. Problems such as changes in optical values occurred. Conventionally, when a large amount of other resin is added to the cellulose ester resin in order to improve the moisture resistance, it is considered that the transparency is lowered, and the moisture resistance is such that the optical value does not change in a high humidity environment. A cellulose ester film having improved properties has not been obtained.
  • the present invention has been made in view of the above problems and situations, and a solution to that problem is to provide an optical film having low hygroscopicity, transparency, high heat resistance, and markedly improved brittleness. .
  • an optical film suitably used as a polarizing plate protective film in a large-sized liquid crystal display device or a liquid crystal display device for outdoor use.
  • An optical film produced by a solution casting method comprising (i) an acrylic resin (A) and a cellulose ester resin (B) in a mass ratio of 95: 5 to 30:70, and (ii) a methyl methacrylate monomer And (iii) the acrylic resin (A) has a weight average molecular weight of not less than 80000, and is contained in the acrylic resin (A).
  • the content of the methyl methacrylate monomer is 0.20 to 1.00% by mass with respect to the total mass of the acrylic resin (A), and (iv) the total acyl groups of the cellulose ester resin (B)
  • the degree of substitution is 2.0 to 3.0
  • the degree of substitution of acyl groups in the range of 3 to 7 carbon atoms is 1.2 to 3.0
  • the weight average molecular weight of the cellulose ester resin (B) is 75,000 or more
  • Item 4 The optical film according to any one of Items 1 to 3, wherein the cellulose ester resin (B) has a total substitution degree of acyl groups of 2.5 to 3.0.
  • Item 5 The optical film according to any one of Items 1 to 4, wherein the acrylic resin (A) has 50 to 99 mass% of methyl methacrylate units in the molecule.
  • the mass ratio between the acrylic resin (A) and the cellulose ester resin (B) is in the range of 95: 5 to 50:50, according to any one of the first to fifth items, The optical film as described.
  • the mass ratio of the acrylic resin (A) and the cellulose ester resin (B) is in the range of 80:20 to 60:40, according to any one of the first to sixth items, The optical film as described.
  • Item 8 The optical film according to any one of Items 1 to 7, wherein the acrylic resin (A) has a weight average molecular weight in the range of 80000 to 1000000.
  • Item 9 The optical film according to any one of Items 1 to 8, wherein the acrylic resin (A) has a weight average molecular weight in the range of 100,000 to 500,000.
  • Item 10 The optical film according to any one of Items 1 to 9, wherein the acrylic resin (A) has a weight average molecular weight in the range of 150,000 to 400,000.
  • Item 11 The optical film according to any one of Items 1 to 10, wherein the cellulose ester resin (B) has a weight average molecular weight in the range of 75,000 to 300,000.
  • Item 12 The optical film according to any one of Items 1 to 11, wherein the cellulose ester resin (B) has a weight average molecular weight in the range of 100,000 to 240,000.
  • the optical film contains 0.5 to 30% by mass of acrylic particles (C) based on the total mass of the resin constituting the optical film.
  • the optical film as described in any one.
  • an optical film that is suitably used as a polarizing plate protective film used in a large-sized liquid crystal display device or a digital signage liquid crystal display device.
  • the optical film of the present invention to at least one surface of a polarizing plate, a liquid crystal display device in which fluctuations in viewing angle and color shift are reduced can be obtained.
  • a cellulose ester film is generally used as a polarizing plate protective film.
  • the cellulose ester film has a drawback of higher hygroscopicity than an acrylic film.
  • an acrylic resin having a large molecular weight is considered to be incompatible with the cellulose ester resin, and it has been considered difficult to improve the hygroscopicity by mixing the resin.
  • Patent Document 5 describes that an acrylic resin having a relatively low molecular weight is added to the cellulose ester resin as a plasticizer.
  • the hygroscopicity cannot be improved because the addition amount is small, and an acrylic resin having a low molecular weight is used. By adding, the heat resistance is lowered, and characteristics suitable as an optical film used for a large-sized liquid crystal display device or a liquid crystal display device for outdoor use cannot be obtained.
  • the acrylic resin film has poor heat resistance, and has a property that its shape is easily changed and inferior in brittleness when used at high temperatures or for long-term use.
  • Patent Documents 1 to 3 although efforts have been made to improve the characteristics of acrylic resin, sufficient characteristics as an optical film have not been obtained.
  • Patent Document 3 a technique for improving heat resistance by mixing a cellulose ester resin with an acrylic resin has been devised, but it was thought that a cellulose ester resin having a high molecular weight was incompatible with an acrylic resin. The cellulose ester resin having a low molecular weight was added, and as a result, the brittleness was not sufficiently improved.
  • a cellulose ester resin having a specific substitution degree exhibits high compatibility with respect to an acrylic resin having a specific molecular weight, and surprisingly, a molecular weight comparison is made. It has been found that even higher cellulose ester resins can be compatible without increasing haze.
  • the methyl methacrylate monomer contained in the raw acrylic resin is brought into the finished film as it is, but in the solution film forming method, the content of the methyl methacrylate monomer in the film is less than the raw material. . This is presumably because the methyl methacrylate monomer is extracted in the solvent in which the resin is dissolved and removed in the film drying step.
  • the content of methyl methacrylate monomer in the film is further reduced by blending a cellulose ester resin having a specific substitution degree with respect to the acrylic resin. This is presumably because the blended cellulose ester resin having a specific degree of substitution has the effect of increasing the diffusion rate of the solvent and the like in the acrylic resin.
  • the sensitizing methyl methacrylate monomer By removing the sensitizing methyl methacrylate monomer from the film during the drying process, the safety and environmental friendliness of the film will be improved, but the methyl methacrylate monomer should be removed under specific drying process conditions. As a result, the physical properties of the film, particularly the brittleness, are greatly improved.
  • the optical film of the present invention is an optical film produced by a solution casting method, comprising (i) an acrylic resin (A) and a cellulose ester resin (B) in a mass ratio of 95: 5 to 30:70, (Ii) containing methyl methacrylate monomer in an amount of 0.02 to 0.15% by mass based on the total mass of the optical film, (iii) the acrylic resin (A) has a weight average molecular weight of 80000 or more, The content of the methyl methacrylate monomer in the acrylic resin (A) is 0.20 to 1.00% by mass with respect to the total mass of the acrylic resin (A), and (iv) the cellulose ester resin ( The total substitution degree of the acyl group of B) is 2.0 to 3.0, the substitution degree of the acyl group within the range of 3 to 7 carbon atoms is 1.2 to 3.0, and the cellulose ester resin ( B) Weight average The child quantity is 75000 or more.
  • This feature is a technical feature common to the inventions according to
  • the optical film of the present invention is an optical film produced by a solution casting method and is characterized by satisfying the following requirements (i) to (iv).
  • the acrylic resin (A) has a weight average molecular weight of 80000 or more, and the content of the methyl methacrylate monomer in the acrylic resin (A) is the acrylic resin ( A) 0.20 to 1.00% by mass based on the total mass (iv)
  • the total substitution degree of acyl groups of the cellulose ester resin (B) is 2.0 to 3.0, and the number of carbon atoms
  • the substitution degree of the acyl group within the range of 3 to 7 is 1.2 to 3.0, and the weight average molecular weight of the cellulose ester resin (B) is 75000 or more.
  • the sum of the substitution degrees of the acyl groups outside the range of 3-7 carbon atoms of the cellulose ester resin (B) is preferably 1.3 or less. Further, it is preferable that the total substitution degree of acyl groups having 3 to 7 carbon atoms in the cellulose ester resin (B) is 2.00 or more. Further, the total substitution degree of acyl groups of the cellulose ester resin (B) is preferably 2.5 to 3.0.
  • the acrylic resin (A) preferably has 50 to 99% by mass of methyl methacrylate units in the molecule.
  • the mass ratio of the acrylic resin (A) and the cellulose ester resin (B) is preferably in the range of 95: 5 to 50:50, more preferably in the range of 80:20 to 60:40. It is to be.
  • the acrylic resin (A) preferably has a weight average molecular weight in the range of 80,000 to 1,000,000, more preferably in the range of 100,000 to 500,000, and most preferably in the range of 150,000 to 400,000. It is within the range.
  • the weight average molecular weight of the cellulose ester resin (B) is preferably in the range of 75,000 to 300,000. More preferably, it is within the range of 100,000 to 240,000.
  • the optical film of the present invention preferably has an aspect containing 0.5 to 30% by mass of acrylic particles (C) with respect to the total mass of the resin constituting the optical film.
  • the optical film of the present invention can be suitably used as a polarizing plate protective film when the film thickness is in the range of 20 to 200 ⁇ m.
  • the acrylic resin used in the present invention includes a methacrylic resin.
  • the resin is not particularly limited, but a resin comprising 50 to 99% by mass of methyl methacrylate units and 1 to 50% by mass of other monomer units copolymerizable therewith is preferable.
  • alkyl methacrylates having 2 to 18 alkyl carbon atoms examples include alkyl methacrylates having 2 to 18 alkyl carbon atoms, alkyl acrylates having 1 to 18 carbon atoms, acrylic acid, methacrylic acid, and other ⁇ , ⁇ -insoluble monomers.
  • Unsaturated group-containing divalent carboxylic acids such as saturated acid, maleic acid, fumaric acid and itaconic acid, aromatic vinyl compounds such as styrene and ⁇ -methylstyrene, ⁇ , ⁇ -unsaturated nitriles such as acrylonitrile and methacrylonitrile, Examples thereof include maleic anhydride, maleimide, N-substituted maleimide, glutaric anhydride and the like, and these can be used alone or in combination of two or more monomers.
  • methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, s-butyl acrylate, 2-ethylhexyl acrylate, and the like are preferable from the viewpoint of thermal decomposition resistance and fluidity of the copolymer.
  • n-Butyl acrylate is particularly preferably used.
  • the acrylic resin (A) used in the optical film of the present invention has a weight average molecular weight (Mw) particularly from the viewpoint of improving brittleness as an optical film and improving transparency when it is compatible with the cellulose ester resin (B). Is 80000 or more.
  • Mw weight average molecular weight
  • the weight average molecular weight (Mw) of the acrylic resin (A) is more preferably in the range of 80,000 to 1,000,000, particularly preferably in the range of 100,000 to 600,000, and most preferably in the range of 150,000 to 400,000. preferable.
  • the upper limit of the weight average molecular weight (Mw) of an acrylic resin (A) is not specifically limited, It is a preferable form that it shall be 1 million or less from a viewpoint on manufacture.
  • the weight average molecular weight of the acrylic resin according to the present invention can be measured by gel permeation chromatography.
  • the measurement conditions are as follows.
  • the methyl methacrylate monomer content in the acrylic resin according to the present invention can be measured by a gas chromatograph mass spectrometer.
  • the measurement conditions are as follows.
  • Sample Acrylic resin is dissolved in acetonitrile to prepare a 0.1% sample solution
  • Sample volume 1 ⁇ l
  • Equipment HP 5890 Series II / HP 5971
  • MSD Column: InertCAP for amines (0.32 mmid ⁇ 30 m) manufactured by GL Sciences Inlet: 200 ° C
  • the amount of methyl methacrylate monomer in the produced optical film can also be measured by the same method.
  • the production method of the acrylic resin (A) in the present invention is not particularly limited, and any known method such as suspension polymerization, emulsion polymerization, bulk polymerization, or solution polymerization may be used.
  • a polymerization initiator a normal peroxide type and an azo type can be used, and a redox type can also be used.
  • the polymerization temperature may be 30 to 100 ° C. for suspension or emulsion polymerization, and 80 to 160 ° C. for bulk or solution polymerization.
  • polymerization can be carried out using alkyl mercaptan or the like as a chain transfer agent.
  • acrylic resins can be used as the acrylic resin according to the present invention.
  • Delpet 60N, 80N (Asahi Kasei Chemicals Co., Ltd.), Dianal BR52, BR80, BR83, BR85, BR88 (Mitsubishi Rayon Co., Ltd.), KT75 (Denki Kagaku Kogyo Co., Ltd.) and the like can be mentioned.
  • Two or more acrylic resins can be used in combination.
  • the cellulose ester resin (B) according to the present invention has a total acyl group substitution degree (T) of 2.0 to 3 from the viewpoint of transparency particularly when it is improved in brittleness and is compatible with the acrylic resin (A).
  • T total acyl group substitution degree
  • the substitution degree of the acyl group having 3 to 7 carbon atoms is 1.2 to 3.0
  • the substitution degree of the acyl group having 3 to 7 carbon atoms is 2.0 to 3.0.
  • the cellulose ester resin according to the present invention is a cellulose ester resin substituted with an acyl group having 3 to 7 carbon atoms.
  • propionyl, butyryl and the like are preferably used, and a propionyl group is particularly preferable. Used.
  • the total substitution degree of the acyl group of the cellulose ester resin (B) is less than 2.0, that is, when the residual degree of the hydroxyl groups at the 2, 3, and 6 positions of the cellulose ester molecule is more than 1.0, the acrylic ester When the resin (A) and the acrylic resin (B) are not sufficiently compatible and used as an optical film, haze becomes a problem.
  • the total substitution degree of the acyl group is 2.0 or more, if the substitution degree of the acyl group having 3 to 7 carbon atoms is less than 1.2, still sufficient compatibility cannot be obtained, Brittleness will decrease.
  • the substitution degree of the acyl group having 2 carbon atoms that is, the acetyl group is high
  • the substitution degree of the acyl group having 3 to 7 carbon atoms is 1.
  • the compatibility is lowered and the haze is increased.
  • the substitution degree of the acyl group having 8 or more carbon atoms is high
  • the substitution degree of the acyl group having 3 to 7 carbon atoms is less than 1.2. In such a case, the brittleness deteriorates and desired characteristics cannot be obtained.
  • the acyl substitution degree of the cellulose ester resin (B) according to the present invention is such that the total substitution degree (T) is 2.0 to 3.0, and the substitution degree of the acyl group having 3 to 7 carbon atoms is 1.2 to 3.0. If it is 3.0, there is no problem, but the total degree of substitution of acyl groups other than those having 3 to 7 carbon atoms, that is, acetyl groups or acyl groups having 8 or more carbon atoms, is preferably 1.3 or less. .
  • the total substitution degree (T) of the acyl group of the cellulose ester resin (B) is more preferably in the range of 2.5 to 3.0.
  • the acyl group may be an aliphatic acyl group or an aromatic acyl group. In the case of an aliphatic acyl group, it may be linear or branched and may further have a substituent.
  • the number of carbon atoms of the acyl group in the present invention includes an acyl group substituent.
  • the number of substituents X substituted on the aromatic ring is preferably 0 to 5. Also in this case, it is necessary to pay attention so that the degree of substitution of the acyl group having 3 to 7 carbon atoms including the substituent is 1.2 to 3.0. For example, since the benzoyl group has 7 carbon atoms, when it has a substituent containing carbon, the benzoyl group has 8 or more carbon atoms and is not included in the acyl group having 3 to 7 carbon atoms. Become.
  • substituents substituted on the aromatic ring when the number of substituents substituted on the aromatic ring is 2 or more, they may be the same or different from each other, but they may be linked together to form a condensed polycyclic compound (for example, naphthalene, indene, indane, phenanthrene, quinoline). , Isoquinoline, chromene, chroman, phthalazine, acridine, indole, indoline, etc.).
  • a condensed polycyclic compound for example, naphthalene, indene, indane, phenanthrene, quinoline.
  • Isoquinoline chromene, chroman, phthalazine, acridine, indole, indoline, etc.
  • a structure having at least one kind of an aliphatic acyl group having 3 to 7 carbon atoms is used as a structure used for the cellulose resin according to the present invention.
  • the substitution degree of the cellulose ester resin (B) according to the present invention is such that the total substitution degree (T) of acyl groups is 2.0 to 3.0, and the substitution degree of acyl groups having 3 to 7 carbon atoms is 1.2 to 3.0. 3.0.
  • the total substitution degree of acyl groups other than an acyl group having 3 to 7 carbon atoms, that is, an acetyl group and an acyl group having 8 or more carbon atoms is 1.3 or less.
  • the cellulose ester resin (B) according to the present invention is preferably at least one selected from cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate benzoate, cellulose propionate, and cellulose butyrate, Those having an acyl group having 3 or 4 carbon atoms as a substituent are preferred.
  • particularly preferable cellulose ester resins are cellulose acetate propionate and cellulose propionate.
  • the portion not substituted with an acyl group usually exists as a hydroxyl group. These can be synthesized by known methods.
  • substitution degree of the acetyl group and the substitution degree of other acyl groups were determined by the method prescribed in ASTM-D817-96.
  • the weight average molecular weight (Mw) of the cellulose ester resin according to the present invention is 75,000 or more, particularly from the viewpoint of improving compatibility with the acrylic resin (A) and brittleness, and is preferably in the range of 75,000 to 300,000. It is more preferable that it is in the range of ⁇ 24,000, particularly preferably in the range of 160000 to 20,000.
  • Mw weight average molecular weight
  • the important average molecular weight (Mw) of the cellulose ester resin is less than 75,000, the effect of improving heat resistance and brittleness is not sufficient, and the effect of the present invention cannot be obtained.
  • two or more kinds of cellulose resins can be mixed and used.
  • the acrylic resin (A) and the cellulose ester resin (B) are contained in a mass ratio of 95: 5 to 30:70, preferably 95: 5 to 50:50, Preferably, it is 90:10 to 60:40.
  • the mass ratio of the acrylic resin (A) and the cellulose ester resin (B) is more than 95: 5
  • the effect of the cellulose ester resin (B) cannot be sufficiently obtained, and the mass ratio is
  • the amount of acrylic resin is less than 30:70, the moisture resistance becomes insufficient.
  • the acrylic resin (A) and the cellulose ester resin (B) are preferably contained in a compatible state.
  • the physical properties and quality required for an optical film are achieved by supplementing each other by dissolving different resins.
  • Whether the acrylic resin (A) and the cellulose ester resin (B) are in a compatible state can be determined by, for example, the glass transition temperature Tg.
  • the two resins have different glass transition temperatures
  • there are two or more glass transition temperatures for each resin because there is a glass transition temperature for each resin.
  • the glass transition temperature specific to each resin disappears and becomes one glass transition temperature, which is the glass transition temperature of the compatible resin.
  • the glass transition temperature referred to here is an intermediate value determined according to JIS K7121 (1987) using a differential scanning calorimeter (DSC-7 model manufactured by Perkin Elmer) at a heating rate of 20 ° C./min.
  • the point glass transition temperature (Tmg) is an intermediate value determined according to JIS K7121 (1987) using a differential scanning calorimeter (DSC-7 model manufactured by Perkin Elmer) at a heating rate of 20 ° C./min.
  • the point glass transition temperature (Tmg) The point glass transition temperature (Tmg).
  • the acrylic resin (A) and the cellulose ester resin (B) are each preferably an amorphous resin, and either one may be a crystalline polymer or a partially crystalline polymer. In the present invention, the acrylic resin (A) and the cellulose ester resin (B) are preferably compatible with each other to become an amorphous resin.
  • the weight average molecular weight (Mw) of the acrylic resin (A), the weight average molecular weight (Mw) of the cellulose ester resin (B), and the degree of substitution are different in solubility in the solvent of both resins. It is obtained by measuring each after use.
  • fractionating the resin it is possible to extract and separate the soluble resin by adding a compatible resin in a solvent that is soluble only in either one. At this time, heating operation or reflux is performed. May be. A combination of these solvents may be combined in two or more steps to separate the resin. The dissolved resin and the resin remaining as an insoluble matter are filtered off, and the solution containing the extract can be separated by an operation of evaporating the solvent and drying.
  • These fractionated resins can be identified by general structural analysis of polymers.
  • the optical film of the present invention contains a resin other than the acrylic resin (A) and the cellulose ester resin (B), it can be separated by the same method.
  • the weight average molecular weights (Mw) of the compatible resins are different, the high molecular weight substances are eluted earlier by gel permeation chromatography (GPC), and the lower molecular weight substances are eluted after a longer time. Therefore, it can be easily fractionated and the molecular weight can be measured.
  • GPC gel permeation chromatography
  • the molecular weight of the compatible resin is measured by GPC, and at the same time, the resin solution eluted every time is separated, the solvent is distilled off, and the dried resin is different by quantitatively analyzing the structure.
  • the resin composition for each molecular weight fraction it is possible to identify each compatible resin.
  • the molecular weight distribution of each of the resins separated in advance based on the difference in solubility in a solvent by GPC, it is possible to detect each of the compatible resins.
  • containing acrylic resin (A) and cellulose ester resin (B) in a compatible state means mixing each resin (polymer), resulting in a compatible state. This means that a state in which a precursor of acrylic resin such as monomer, dimer or oligomer is mixed with cellulose ester resin (B) and then polymerized by polymerization is not included. .
  • the process of obtaining a mixed resin by mixing a precursor of an acrylic resin such as a monomer, dimer, or oligomer with the cellulose ester resin (B) and then polymerizing it involves a complicated polymerization reaction.
  • the resin is difficult to control the reaction, and it is difficult to adjust the molecular weight.
  • graft polymerization, cross-linking reaction or cyclization reaction often occurs.
  • the resin is soluble in a solvent or cannot be melted by heating. Since it is difficult to elute the resin and measure the weight average molecular weight (Mw), it is difficult to control the physical properties and it cannot be used as a resin for stably producing an optical film.
  • Mw weight average molecular weight
  • the optical film of the present invention may contain a resin and additives other than the acrylic resin (A) and the cellulose ester resin (B) as long as the function as the optical film is not impaired.
  • the resin to be added may be mixed without being dissolved even if it is in a compatible state.
  • the total mass of the acrylic resin (A) and the cellulose ester resin (B) in the optical film of the present invention is preferably 55% by mass or more of the optical film, more preferably 60% by mass or more, and particularly preferably 70% by mass or more.
  • the optical film of the present invention preferably contains acrylic particles.
  • the acrylic particles (C) according to the present invention are present in a state of particles (also referred to as an incompatible state) in an optical film containing the acrylic resin (A) and the cellulose ester resin (B) in a compatible state. Represents an acrylic component.
  • the acrylic particles (C) are obtained, for example, by collecting a predetermined amount of the produced optical film, dissolving it in a solvent, stirring, and sufficiently dissolving / dispersing it, so that the pore diameter is less than the average particle diameter of the acrylic particles (C). It is preferable that the weight of the insoluble matter filtered and collected using the PTFE membrane filter is 90% by mass or more of the acrylic particles (C) added to the optical film.
  • the acrylic particles (C) used in the present invention are not particularly limited, but are preferably acrylic particles (C) having a layer structure of two or more layers, particularly the following multilayer structure acrylic granular composite. It is preferable.
  • the multilayer structure acrylic granular composite is formed by laminating an innermost hard layer polymer, a cross-linked soft layer polymer exhibiting rubber elasticity, and an outermost hard layer polymer from the center to the outer periphery.
  • the multi-layer structure acrylic granular composite is a multi-layer structure acrylic granular composite composed of an innermost hard layer, a crosslinked soft layer, and an outermost hard layer from the center to the outer periphery.
  • This three-layer core-shell multilayer acrylic granular composite is preferably used.
  • Preferred embodiments of the multilayer structure acrylic granular composite used in the acrylic resin composition according to the present invention include the following.
  • Outermost obtained by polymerizing The layered polymer has a three-layer structure, and the obtained three-layered polymer is the innermost hard layer polymer (a) 5 to 40% by mass, the soft layer polymer (b) 30 to 60% by mass.
  • an outermost hard layer polymer (c) having an insoluble part when fractionated with acetone, and having a methyl ethyl ketone swelling degree of 1.5 to 4.0. Complex.
  • the innermost hard layer polymer (a) constituting the multilayer structure acrylic granular composite is 80 to 98.9% by mass of methyl methacrylate and 1 to 20 mass of alkyl acrylate having 1 to 8 carbon atoms in the alkyl group. % And a mixture of monomers consisting of 0.01 to 0.3% by weight of a polyfunctional grafting agent is preferred.
  • examples of the alkyl acrylate having 1 to 8 carbon atoms in the alkyl group include methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, s-butyl acrylate, 2-ethylhexyl acrylate, and the like. And n-butyl acrylate are preferably used.
  • the ratio of the alkyl acrylate unit in the innermost hard layer polymer (a) is preferably 1 to 20% by mass.
  • polyfunctional grafting agent examples include polyfunctional monomers having different polymerizable functional groups, such as allyl esters of acrylic acid, methacrylic acid, maleic acid, and fumaric acid, and allyl methacrylate is preferably used.
  • the polyfunctional grafting agent is used to chemically bond the innermost hard layer polymer and the soft layer polymer, and the ratio used during the innermost hard layer polymerization is 0.01 to 0.3% by mass. .
  • the crosslinked soft layer polymer (b) constituting the acrylic granular composite is an alkyl acrylate having from 9 to 8 carbon atoms having an alkyl group of 1 to 8 in the presence of the innermost hard layer polymer (a). What is obtained by polymerizing a mixture of monomers comprising, by mass, 0.01 to 5% by mass of a polyfunctional crosslinking agent and 0.5 to 5% by mass of a polyfunctional grafting agent is preferred.
  • n-butyl acrylate or 2-ethylhexyl acrylate is preferably used as the alkyl acrylate having 4 to 8 carbon atoms in the alkyl group.
  • Examples of other monofunctional monomers that can be copolymerized include styrene and substituted styrene derivatives.
  • styrene and substituted styrene derivatives Regarding the ratio of alkyl acrylate having 4 to 8 carbon atoms in the alkyl group and styrene, the more the former, the lower the glass transition temperature of the polymer (b), that is, the softer it is.
  • the refractive index of the soft layer polymer (b) at room temperature is set to the innermost hard layer polymer (a), the outermost hard layer polymer (c), and the hard heat. It is more advantageous to make it closer to the plastic acrylic resin, and the ratio between them is selected in consideration of these.
  • polyfunctional grafting agent those mentioned in the section of the innermost layer hard polymer (a) can be used.
  • the polyfunctional grafting agent used here is used to chemically bond the soft layer polymer (b) and the outermost hard layer polymer (c), and the proportion used during the innermost hard layer polymerization is impact resistance. From the viewpoint of the effect of imparting properties, 0.5 to 5% by mass is preferable.
  • polyfunctional crosslinking agent generally known crosslinking agents such as divinyl compounds, diallyl compounds, diacrylic compounds, dimethacrylic compounds and the like can be used, but polyethylene glycol diacrylate (molecular weight 200 to 600) is preferably used.
  • the polyfunctional cross-linking agent used here is used to generate a cross-linked structure during the polymerization of the soft layer (b) and to exhibit the effect of imparting impact resistance.
  • the polyfunctional crosslinking agent is not an essential component because the crosslinked structure of the soft layer (b) is generated to some extent. Is preferably 0.01 to 5% by weight from the viewpoint of imparting impact resistance.
  • the outermost hard layer polymer (c) constituting the multi-layer structure acrylic granular composite has a methyl methacrylate of 80 to 99 mass in the presence of the innermost hard layer polymer (a) and the soft layer polymer (b). % And a mixture of monomers consisting of 1 to 20% by mass of an alkyl acrylate having 1 to 8 carbon atoms in the alkyl group is preferred.
  • the acrylic alkylate those described above are used, but methyl acrylate and ethyl acrylate are preferably used.
  • the proportion of the alkyl acrylate unit in the outermost hard layer (c) is preferably 1 to 20% by mass.
  • an alkyl mercaptan or the like can be used as a chain transfer agent to adjust the molecular weight for the purpose of improving the compatibility with the acrylic resin (A).
  • the outermost hard layer with a gradient such that the molecular weight gradually decreases from the inside toward the outside in order to improve the balance between elongation and impact resistance.
  • the outermost hard layer is divided into two or more monomer mixtures for forming the outermost hard layer, and the amount of chain transfer agent to be added each time is increased sequentially. It is possible to decrease the molecular weight of the polymer forming the layer from the inside to the outside of the multilayer structure acrylic granular composite.
  • the molecular weight formed at this time can also be examined by polymerizing a mixture of monomers used each time under the same conditions, and measuring the molecular weight of the resulting polymer.
  • the particle diameter of the acrylic particles (C) preferably used in the present invention is not particularly limited, but is preferably 10 to 1000 nm, more preferably 20 to 500 nm, particularly 50 to Most preferably, it is 400 nm.
  • the mass ratio of the core and the shell is not particularly limited, but when the entire multilayer structure polymer is 100 parts by mass,
  • the core layer is preferably 50 to 90 parts by mass, and more preferably 60 to 80 parts by mass.
  • the core layer here is an innermost hard layer.
  • Examples of such commercially available multilayered acrylic granular composites include, for example, “Metablene” manufactured by Mitsubishi Rayon Co., “Kane Ace” manufactured by Kaneka Chemical Co., Ltd., “Paraloid” manufactured by Kureha Chemical Co., Ltd., Rohm and Haas “Acryloid” manufactured by KK, “Staffyroid” manufactured by Ganz Kasei Kogyo Co., Ltd., “Parapet SA” manufactured by Kuraray Co., Ltd., and the like can be used alone or in combination of two or more.
  • acrylic particles (C) that are graft copolymers preferably used as the acrylic particles (C) preferably used in the present invention include unsaturated carboxylic acid esters in the presence of a rubbery polymer. Copolymerization of a mixture of monomers, unsaturated carboxylic acid monomers, aromatic vinyl monomers, and other vinyl monomers copolymerizable with these if necessary Examples thereof include a graft copolymer.
  • the rubbery polymer used for the acrylic particle (C) which is a graft copolymer Diene type rubber, acrylic type rubber, ethylene type rubber, etc.
  • Specific examples include polybutadiene, styrene-butadiene copolymer, block copolymer of styrene-butadiene, acrylonitrile-butadiene copolymer, butyl acrylate-butadiene copolymer, polyisoprene, butadiene-methyl methacrylate copolymer, Butyl acrylate-methyl methacrylate copolymer, butadiene-ethyl acrylate copolymer, ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-isoprene copolymer, and ethylene-methyl acrylate copolymer A polymer etc. are mentioned. These rubbery polymers can be used alone or
  • the refractive index of the mixture of an acrylic resin (A) and a cellulose-ester resin (B) and the refractive index of an acrylic particle (C) must be near. From the viewpoint of obtaining a film with high transparency.
  • the refractive index difference between the acrylic particles (C) and the acrylic resin (A) is preferably 0.05 or less, more preferably 0.02 or less, and particularly preferably 0.01 or less.
  • a method of adjusting the monomer unit composition ratio of the acrylic resin (A) and / or a rubbery polymer or monomer used for the acrylic particles (C) The refractive index difference can be reduced by a method of adjusting the composition ratio, and an optical film excellent in transparency can be obtained.
  • the refractive index difference referred to here is a solution in which the optical film of the present invention is sufficiently dissolved in a solvent in which the acrylic resin (A) is soluble to obtain a cloudy solution, which is subjected to an operation such as centrifugation. After separating the solvent-soluble part and the insoluble part and purifying the soluble part (acrylic resin (A)) and insoluble part (acrylic particles (C)), the measured refractive index (23 ° C., measuring wavelength: 550 nm). ) Difference.
  • the method of blending the acrylic particles (C) with the acrylic resin (A) is not particularly limited. After the acrylic resin (A) and other optional components are previously blended, usually at 200 to 350 ° C. A method of uniformly kneading with a single screw or twin screw extruder while adding acrylic particles (C) is preferably used.
  • a solution in which acrylic particles (C) are dispersed in advance is added to and mixed with a solution (dope solution) in which acrylic resin (A) and cellulose ester resin (B) are dissolved, acrylic particles (C) and A method such as in-line addition of a solution obtained by dissolving or mixing other optional additives can be used.
  • acrylic particles can also be used as the acrylic particles according to the present invention.
  • metabrene W-341 (manufactured by Mitsubishi Rayon Co., Ltd.)
  • Chemisnow MR-2G (C3)
  • MS-300X (manufactured by Soken Chemical Co., Ltd.) and the like can be mentioned.
  • the optical film of the present invention preferably contains 0.5 to 30% by mass of acrylic particles (C) with respect to the total mass of the resin constituting the film, and is in the range of 1.0 to 15% by mass. It is more preferable to contain.
  • a plasticizer can be used in combination in order to improve the fluidity and flexibility of the composition.
  • the plasticizer include phthalate ester, fatty acid ester, trimellitic ester, phosphate ester, polyester, and epoxy.
  • polyester-based and phthalate-based plasticizers are preferably used.
  • Polyester plasticizers are superior in non-migration and extraction resistance compared to phthalate ester plasticizers such as dioctyl phthalate, but are slightly inferior in plasticizing effect and compatibility.
  • the polyester plasticizer is a reaction product of a monovalent or tetravalent carboxylic acid and a monovalent or hexavalent alcohol, and is mainly obtained by reacting a divalent carboxylic acid with a glycol.
  • Representative divalent carboxylic acids include glutaric acid, itaconic acid, adipic acid, phthalic acid, azelaic acid, sebacic acid and the like.
  • glycol examples include glycols such as ethylene, propylene, 1,3-butylene, 1,4-butylene, 1,6-hexamethylene, neopentylene, diethylene, triethylene, and dipropylene. These divalent carboxylic acids and glycols may be used alone or in combination.
  • the ester plasticizer may be any of ester, oligoester, and polyester types, and the molecular weight is preferably in the range of 100 to 10,000, and preferably in the range of 600 to 3000, which has a large plasticizing effect.
  • the viscosity of the plasticizer has a correlation with the molecular structure and molecular weight, but in the case of an adipic acid plasticizer, the range of 200 to 5000 MPa ⁇ s (25 ° C.) is preferable because of compatibility and plasticization efficiency. Furthermore, some polyester plasticizers may be used in combination.
  • the plasticizer is preferably added in an amount of 0.5 to 30 parts by mass with respect to 100 parts by mass of the optical film of the present invention. If the added amount of the plasticizer exceeds 30 parts by mass, the surface becomes sticky, which is not preferable for practical use.
  • the optical film of the present invention preferably contains an ultraviolet absorber, and examples of the ultraviolet absorber used include benzotriazole, 2-hydroxybenzophenone, and salicylic acid phenyl ester.
  • the ultraviolet absorber used include benzotriazole, 2-hydroxybenzophenone, and salicylic acid phenyl ester.
  • ultraviolet absorbers having a molecular weight of 400 or more are less likely to volatilize at a high boiling point and are difficult to disperse even during high-temperature molding, so that the weather resistance is effectively improved with a relatively small amount of addition. be able to.
  • Examples of the ultraviolet absorber having a molecular weight of 400 or more include 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole, 2,2-methylenebis [4- (1, 1,3,3-tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol], bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis ( Hindered amines such as 1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and 2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonic acid Bis (1,2,2,6,6-pentamethyl-4-piperidyl), 1- [2- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] Such as til] -4- [3- (3,5-di-tert-butyl
  • 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole and 2,2-methylenebis [4- (1,1,3,3- Tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol] is particularly preferred.
  • antioxidants can be added to the optical film of the present invention in order to improve the thermal decomposability and thermal colorability during molding. It is also possible to add an antistatic agent to give the optical film antistatic performance.
  • a flame retardant acrylic resin composition containing a phosphorus flame retardant may be used.
  • Phosphorus flame retardants used here include red phosphorus, triaryl phosphate ester, diaryl phosphate ester, monoaryl phosphate ester, aryl phosphonate compound, aryl phosphine oxide compound, condensed aryl phosphate ester, halogenated alkyl phosphorus. Examples thereof include one or a mixture of two or more selected from acid esters, halogen-containing condensed phosphates, halogen-containing condensed phosphonates, halogen-containing phosphites, and the like.
  • triphenyl phosphate 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, phenylphosphonic acid, tris ( ⁇ -chloroethyl) phosphate, tris (dichloropropyl) Examples thereof include phosphate and tris (tribromoneopentyl) phosphate.
  • optical film of the present invention improvement of low hygroscopicity, transparency, high heat resistance and brittleness which cannot be achieved by conventional resin films can be achieved at the same time.
  • the brittleness index is determined based on the criterion of whether or not it is “an optical film that does not cause ductile fracture”.
  • an optical film that does not cause ductile fracture By obtaining an optical film with improved brittleness that does not cause ductile fracture, even when manufacturing a polarizing plate for a large-sized liquid crystal display device, breakage and cracking during production do not occur, and the handling property is excellent. It can be an optical film.
  • the ductile fracture is a fracture caused by applying a stress larger than the strength of a certain material, and is defined as a fracture accompanied by significant elongation or drawing of the material until the final fracture.
  • the fracture surface is characterized by numerous indentations called dimples.
  • an optical film that does not cause ductile fracture is evaluated based on the fact that no breakage or the like is observed even when a large stress is applied such that the film is folded in two. . Even if it is used as a polarizing plate protective film for a large-sized liquid crystal display device, if it is an optical film that does not cause ductile fracture even when such a large stress is applied, problems such as breakage during production Furthermore, even when the optical film is used after being peeled off after being pasted once, no breakage occurs and the optical film can be sufficiently reduced in thickness.
  • the tension softening point is used as an index of heat resistance.
  • the tension softening point is 105 ° C. to 145 ° C., it can be judged that sufficient heat resistance is exhibited. In particular, it is more preferable to control at 110 ° C. to 130 ° C.
  • the optical film is cut out at 120 mm (length) ⁇ 10 mm (width).
  • the temperature can be raised at a rate of 30 ° C./min while pulling with a tension of 10 N, and the temperature at the time when the pressure reaches 9 N is measured three times, and the average value can be obtained.
  • the optical film preferably has a glass transition temperature (Tg) of 110 ° C. or higher. More preferably, it is 120 ° C. or higher. Especially preferably, it is 150 degreeC or more.
  • Tg glass transition temperature
  • the glass transition temperature referred to here is an intermediate value determined according to JIS K7121 (1987) using a differential scanning calorimeter (DSC-7 model manufactured by Perkin Elmer) at a heating rate of 20 ° C./min. Point glass transition temperature (Tmg).
  • Haze value is used as an index for judging the transparency of the optical film in the present invention.
  • liquid crystal display devices used outdoors are required to have sufficient brightness and high contrast even in a bright place. Therefore, the haze value is required to be 1.0% or less, and 0.5% or less. More preferably.
  • the optical film of the present invention containing the acrylic resin (A) and the cellulose ester resin (B), high transparency can be obtained, but when using acrylic particles for the purpose of improving another physical property.
  • acrylic particles for the purpose of improving another physical property.
  • the particle diameter and addition amount of acrylic particles (C) should be kept within the above range, and the surface roughness of the film contact portion during film formation should be reduced. Is also effective.
  • the hygroscopicity of the optical film in the present invention is evaluated by dimensional change with respect to humidity change.
  • the following method is used as an evaluation method of dimensional change with respect to humidity change.
  • the dimensional change rate (%) is expressed by the following formula.
  • Dimensional change rate (%) [(a1-a2) / a1] ⁇ 100 a1: Distance before heat treatment a2: Distance after heat treatment
  • a1 Distance before heat treatment
  • a2 Distance after heat treatment
  • the optical film of the present invention preferably has a defect with a diameter of 5 ⁇ m or more in the film plane of 1 piece / 10 cm square or less. More preferably, it is 0.5 piece / 10 cm square or less, more preferably 0.1 piece / 10 cm square or less.
  • the diameter of the defect indicates the diameter when the defect is circular, and when it is not circular, the range of the defect is determined by observing with a microscope according to the following method, and the maximum diameter (diameter of circumscribed circle) is determined.
  • the range of the defect is the size of the shadow when the defect is observed with the transmitted light of the differential interference microscope when the defect is a bubble or a foreign object.
  • the defect is a change in the surface shape, such as transfer of a roll flaw or an abrasion
  • the size is confirmed by observing the defect with the reflected light of a differential interference microscope.
  • the film When the number of defects is more than 1/10 cm square, for example, when a tension is applied to the film during processing in a later process, the film may be broken with the defect as a starting point and productivity may be reduced.
  • the diameter of the defect is 5 ⁇ m or more, it can be visually confirmed by polarizing plate observation or the like, and a bright spot may occur when used as an optical member.
  • the coating agent may not be formed uniformly, which may result in a defect (missing coating).
  • the defect is a void in the film (foaming defect) generated due to the rapid evaporation of the solvent in the drying process of the solution casting, a foreign matter in the film forming stock solution, or a foreign matter mixed in the film forming. This refers to the foreign matter (foreign matter defect) in the film.
  • the optical film of the present invention preferably has a breaking elongation in at least one direction of 10% or more, more preferably 20% or more in the measurement based on JIS-K7127-1999.
  • the upper limit of the elongation at break is not particularly limited, but is practically about 250%. In order to increase the elongation at break, it is effective to suppress defects in the film caused by foreign matter and foaming.
  • the thickness of the optical film of the present invention is preferably 20 ⁇ m or more. More preferably, it is 30 ⁇ m or more.
  • the upper limit of the thickness is not particularly limited, but in the case of forming a film by a solution casting method, the upper limit is about 250 ⁇ m from the viewpoint of applicability, foaming, solvent drying, and the like.
  • the thickness of a film can be suitably selected according to a use.
  • the optical film of the present invention preferably has a total light transmittance of 90% or more, more preferably 93% or more. Moreover, as a realistic upper limit, it is about 99%. In order to achieve excellent transparency expressed by such total light transmittance, it is necessary not to introduce additives and copolymerization components that absorb visible light, or to remove foreign substances in the polymer by high-precision filtration. It is effective to reduce the diffusion and absorption of light inside the film.
  • the optical film of the present invention can be particularly preferably used as a polarizing plate protective film for a large-sized liquid crystal display device or a liquid crystal display device for outdoor use as long as the above physical properties are satisfied.
  • Such physical properties include that the optical film contains the acrylic resin (A) and the cellulose ester resin (B) in a mass ratio of 95: 5 to 30:70, and the acrylic resin (A) has a weight average molecular weight Mw of 80000.
  • the total substitution degree (T) of the acyl group of the cellulose ester resin (B) is 2.00 to 3.00, and the substitution degree of the acyl group having 3 to 7 carbon atoms is 1.2 to 3.0. And having a weight average molecular weight (Mw) of 75,000 or more.
  • a production method such as an inflation method, a T-die method, a calendar method, a cutting method, a casting method, an emulsion method, or a hot press method can be used. From the standpoint of suppressing optical defects such as die lines and optical defects such as die lines, solution casting by casting is preferred.
  • Organic solvent useful for forming the dope when the optical film of the present invention is produced by the solution casting method is one that simultaneously dissolves the acrylic resin (A), the cellulose ester resin (B), and other additives. It can be used without any limitation.
  • methylene chloride as a non-chlorinated organic solvent, methyl acetate, ethyl acetate, amyl acetate, acetone, tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, cyclohexanone, ethyl formate, 2,2,2-trifluoroethanol, 2,2,3,3-hexafluoro-1-propanol, 1,3-difluoro-2-propanol, 1,1,1,3,3,3-hexafluoro- 2-methyl-2-propanol, 1,1,1,3,3,3-hexafluoro-2-propanol, 2,2,3,3,3-pentafluoro-1-propanol, nitroethane, etc.
  • Methylene chloride, methyl acetate, ethyl acetate and acetone can be preferably used.
  • the dope preferably contains 1 to 40% by mass of a linear or branched aliphatic alcohol having 1 to 4 carbon atoms.
  • a linear or branched aliphatic alcohol having 1 to 4 carbon atoms.
  • the ratio of alcohol in the dope increases, the web gels and peeling from the metal support becomes easy.
  • acrylic resin (A) and cellulose ester in non-chlorine organic solvent system There is also a role of promoting dissolution of the resin (B).
  • acrylic resin (A), cellulose ester resin (B), and acrylic particles (C) 3 A dope composition in which at least 15 to 45% by mass of the seed is dissolved is preferable.
  • linear or branched aliphatic alcohol having 1 to 4 carbon atoms examples include methanol, ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, and tert-butanol. Ethanol is preferred because of the stability of these dopes, the relatively low boiling point, and good drying properties.
  • Dissolution step In an organic solution mainly composed of a good solvent for the acrylic resin (A) and the cellulose ester resin (B), the acrylic resin (A), the cellulose ester resin (B), and, in some cases, acrylic particles ( C), the step of dissolving other additives while stirring to form a dope, or the acrylic resin (A) and cellulose ester resin (B) solutions, optionally with acrylic particle (C) solutions and other additive solutions Are mixed to form a dope which is a main solution.
  • a method carried out at normal pressure a method carried out below the boiling point of the main solvent, a method carried out under pressure above the boiling point of the main solvent, JP-A-9-95544
  • Various dissolution methods such as a method of performing a cooling dissolution method as described in JP-A-9-95557 or JP-A-9-95538, a method of performing at a high pressure as described in JP-A-11-21379, and the like.
  • a method in which pressure is applied at a temperature equal to or higher than the boiling point of the main solvent is particularly preferable.
  • the acrylic resin (A) and cellulose ester resin (B) in the dope are preferably in the range of 15 to 45% by mass in total.
  • An additive is added to the dope during or after dissolution to dissolve and disperse, then filtered through a filter medium, defoamed, and sent to the next step with a liquid feed pump.
  • a filter medium having a collected particle diameter of 0.5 to 5 ⁇ m and a drainage time of 10 to 25 sec / 100 ml.
  • the aggregate remaining at the time of particle dispersion and the aggregate generated when the main dope is added are aggregated by using a filter medium having a collected particle diameter of 0.5 to 5 ⁇ m and a drainage time of 10 to 25 sec / 100 ml. Can only be removed.
  • the concentration of particles is sufficiently thinner than that of the additive solution, so that the aggregates do not stick together during filtration and the filtration pressure does not increase suddenly.
  • FIG. 1 is a diagram schematically showing an example of a dope preparation step, a casting step, and a drying step of a solution casting film forming method preferable for the present invention.
  • the main dope solution is filtered by the main filter 3, and an ultraviolet absorbent additive solution is added in-line from 16 to this.
  • the main dope may contain about 10 to 50% by weight of recycled material.
  • the return material may contain acrylic particles. In that case, it is preferable to control the addition amount of the acrylic particle addition liquid in accordance with the addition amount of the return material.
  • the additive solution containing acrylic particles preferably contains 0.5 to 10% by mass of acrylic particles, more preferably 1 to 10% by mass, and more preferably 1 to 5% by mass. Most preferably.
  • the additive solution is preferable because it has a low viscosity and is easy to handle and can be easily added to the main dope.
  • the return material is a product obtained by finely pulverizing the optical film, which is generated when the optical film is formed, and is obtained by cutting off both sides of the film, or by using an optical film original that has been speculated out due to scratches, etc. .
  • an acrylic resin, a cellulose ester resin, and in some cases, acrylic particles kneaded into pellets can be preferably used.
  • An endless metal belt 31 such as a stainless steel belt or a rotating metal drum that feeds the dope to a pressure die 30 through a liquid feed pump (for example, a pressurized metering gear pump) and transfers it indefinitely.
  • a liquid feed pump for example, a pressurized metering gear pump
  • the pressure die includes a coat hanger die and a T die, and any of them is preferably used.
  • the surface of the metal support is a mirror surface.
  • two or more pressure dies may be provided on the metal support, and the dope amount may be divided and stacked. Or it is also preferable to obtain the film of a laminated structure by the co-casting method which casts several dope simultaneously.
  • Solvent evaporation step In this step, the web (the dope is cast on the casting support and the formed dope film is called a web) is heated on the casting support to evaporate the solvent.
  • the web on the support after casting is preferably dried on the support in an atmosphere of 40 to 100 ° C. In order to maintain the atmosphere at 40 to 100 ° C., it is preferable to apply hot air at this temperature to the upper surface of the web or heat by means such as infrared rays.
  • Peeling process It is the process of peeling the web which the solvent evaporated on the metal support body in a peeling position. The peeled web is sent to the next process.
  • the temperature at the peeling position on the metal support is preferably 10 to 40 ° C., more preferably 11 to 30 ° C.
  • the residual solvent amount at the time of peeling of the web on the metal support at the time of peeling is preferably peeled in the range of 50 to 120% by mass depending on the strength of drying conditions, the length of the metal support, and the like.
  • the amount of solvent is determined.
  • the amount of residual solvent in the web is defined by the following formula.
  • Residual solvent amount (%) (mass before web heat treatment ⁇ mass after web heat treatment) / (mass after web heat treatment) ⁇ 100
  • the heat treatment for measuring the residual solvent amount represents performing heat treatment at 140 ° C. for 2 hours.
  • the peeling tension at the time of peeling the metal support from the film is usually 196 to 245 N / m. However, if wrinkles easily occur at the time of peeling, it is preferable to peel with a tension of 190 N / m or less. It is preferable to peel at a minimum tension of ⁇ 166.6 N / m, and then peel at a minimum tension of ⁇ 137.2 N / m, and particularly preferable to peel at a minimum tension of ⁇ 100 N / m.
  • the temperature at the peeling position on the metal support is preferably ⁇ 50 to 40 ° C., more preferably 10 to 40 ° C., and most preferably 15 to 30 ° C.
  • a drying device 35 that transports the web alternately through rolls arranged in the drying device and / or a tenter stretching device 34 that clips and transports both ends of the web with clips. And dry the web.
  • the drying means is generally to blow hot air on both sides of the web, but there is also a means to heat by applying microwaves instead of wind. Too rapid drying tends to impair the flatness of the finished film. Drying at a high temperature is preferably performed from about 8% by mass or less of residual solvent. Throughout, drying is generally performed at 40-250 ° C. In particular, drying at 40 to 160 ° C. is preferable.
  • tenter stretching apparatus When using a tenter stretching apparatus, it is preferable to use an apparatus capable of independently controlling the film gripping length (distance from the start of gripping to the end of gripping) by the left and right gripping means of the tenter. In the tenter process, it is also preferable to intentionally create sections having different temperatures in order to improve planarity.
  • the stretching operation may be performed in multiple stages. For example, stretching may be performed mainly in the first half of the tenter process and the width may be maintained to relieve the stress of the film in the second half, or after sufficient preheating in the first half of the tenter process, the stretching operation may be performed in the second half. Also good. It is also preferable to perform biaxial stretching in the casting direction and the width direction. When biaxial stretching is performed, simultaneous biaxial stretching may be performed or may be performed stepwise.
  • stepwise means that, for example, stretching in different stretching directions can be sequentially performed, stretching in the same direction is divided into multiple stages, and stretching in different directions is added to any one of the stages. Is also possible. That is, for example, the following stretching steps are possible.
  • Simultaneous biaxial stretching includes stretching in one direction and contracting the other while relaxing the tension.
  • the preferred draw ratio for simultaneous biaxial stretching can be in the range of x1.01 to x1.5 in both the width direction and the longitudinal direction.
  • the amount of residual solvent in the web is preferably 20 to 100% by mass at the start of the tenter, and drying is preferably performed while the tenter is applied until the amount of residual solvent in the web is 10% by mass or less. More preferably, it is 5% by mass or less.
  • the drying temperature is preferably 30 to 160 ° C, more preferably 50 to 150 ° C, and most preferably 70 to 140 ° C.
  • the temperature distribution in the width direction of the atmosphere is small from the viewpoint of improving the uniformity of the film.
  • the temperature distribution in the width direction in the tenter process is preferably within ⁇ 5 ° C, and within ⁇ 2 ° C. Is more preferable, and within ⁇ 1 ° C. is most preferable.
  • the amount of residual solvent is preferably 5% or less, and more preferably 2% or less.
  • the drying temperature in the drying step after the tenter step is preferably 80 ° C. to 160 ° C., more preferably 90 to 140 ° C.
  • the drying temperature is preferably set lower in the first half of the drying step and higher in the second half.
  • This drying temperature can be adjusted by the residual solvent of the web and the conveyance tension. That is, when the residual solvent is large, the apparent Tg of the web is lowered. Therefore, it is preferable to suppress the elongation of the web by lowering the drying temperature.
  • the residual solvent can be further reduced while suppressing the elongation of the web by setting the drying temperature higher after lowering the transport tension using a tension cut roll or the like.
  • the methyl methacrylate monomer can be efficiently removed by the combination of the temperature, time and stretching ratio of the tenter process and the temperature and time of the drying process after the tenter process, and the film characteristics, particularly brittleness, can be improved.
  • the tenter process if the film is stretched in the first half, the thickness of the web becomes thin at an early stage, so that the effects of removing methyl methacrylate monomer and improving brittleness may be easily obtained.
  • the residence time in the tenter process it is necessary to appropriately select a combination of the temperature and the draw ratio.
  • the drying process it is preferable to perform the drying process at a temperature 20 ° C. or more higher than the Tg of the web in either the tenter process or the drying process after the tenter process.
  • brittleness can be greatly improved. Even if the methyl methacrylate monomer is removed by extending the time at a temperature lower than Tg + 20 ° C. of the web, the effect of improving brittleness is small.
  • Winding step This is a step of winding the optical film by the winder 37 after the residual solvent amount in the web is 2% by mass or less, and the dimensional stability is achieved by setting the residual solvent amount to 0.4% by mass or less. A film with good properties can be obtained. It is particularly preferable to wind up at 0.00 to 0.10% by mass.
  • a generally used one may be used, and there are a constant torque method, a constant tension method, a taper tension method, a program tension control method with a constant internal stress, etc., and these may be used properly.
  • the optical film of the present invention is preferably a long film, specifically a film having a thickness of about 100 to 10,000 m, and usually in a form provided in a roll form.
  • the film width is preferably 1.3 to 4 m, more preferably 1.4 to 2 m.
  • the film thickness of the optical film of the present invention is not particularly limited, but when used for a polarizing plate protective film described later, it is preferably 20 to 200 ⁇ m, more preferably 25 to 100 ⁇ m, and 30 to 80 ⁇ m. It is particularly preferred.
  • a polarizing plate When using the optical film of this invention as a protective film for polarizing plates, a polarizing plate can be produced by a general method. It is preferable that an adhesive layer is provided on the back side of the optical film of the present invention, and is bonded to at least one surface of a polarizer produced by immersion and stretching in an iodine solution.
  • the optical film of the present invention may be used, or another polarizing plate protective film may be used.
  • a commercially available cellulose ester film for example, Konica Minoltac KC8UX, KC4UX, KC5UX, KC8UY, KC4UY, KC6UA, KC4UA, KC12UR, KC8UCR-3, KC8UCR-4, KC8UCR-5, KC8UE, C4, R4 -4, KC4HR-1, KC8UY-HA, KC8UX-RHA, manufactured by Konica Minolta Opto Co., Ltd.) and the like are preferably used.
  • a polarizer which is a main component of a polarizing plate, is an element that transmits only light having a plane of polarization in a certain direction.
  • a typical polarizing film known at present is a polyvinyl alcohol polarizing film, which is a polyvinyl alcohol. There are one in which iodine is dyed on a system film and one in which dichroic dye is dyed.
  • the polarizer is formed by forming a polyvinyl alcohol aqueous solution into a film and dyeing the film by uniaxial stretching or dyeing or uniaxially stretching, and then performing a durability treatment with a boron compound.
  • a pressure-sensitive adhesive having a storage elastic modulus at 25 ° C. in the range of 1.0 ⁇ 10 4 Pa to 1.0 ⁇ 10 9 Pa in at least a part of the pressure-sensitive adhesive layer is used.
  • a curable pressure-sensitive adhesive that forms a high molecular weight body or a crosslinked structure by various chemical reactions after the pressure-sensitive adhesive is applied and bonded is suitably used.
  • urethane adhesives examples include, for example, urethane adhesives, epoxy adhesives, aqueous polymer-isocyanate adhesives, curable adhesives such as thermosetting acrylic adhesives, moisture-curing urethane adhesives, polyether methacrylate types
  • curable adhesives such as thermosetting acrylic adhesives, moisture-curing urethane adhesives, polyether methacrylate types
  • anaerobic pressure-sensitive adhesives such as ester-based methacrylate type and oxidized polyether methacrylate, cyanoacrylate-based instantaneous pressure-sensitive adhesives, and acrylate-peroxide-based two-component instantaneous pressure-sensitive adhesives.
  • the above-mentioned pressure-sensitive adhesive may be a one-component type or a type in which two or more components are mixed before use.
  • the above-mentioned pressure-sensitive adhesive may be a solvent system using an organic solvent as a medium, or an aqueous system such as an emulsion type, a colloidal dispersion type, or an aqueous solution type that is a medium containing water as a main component. It may be a solvent type.
  • concentration of the pressure-sensitive adhesive liquid may be appropriately determined depending on the film thickness after adhesion, the coating method, the coating conditions, and the like, and is usually 0.1 to 50% by mass.
  • polarizing plate By incorporating the polarizing plate bonded with the optical film of the present invention into a liquid crystal display device, it is possible to produce various liquid crystal display devices with excellent visibility, but particularly outdoors such as large liquid crystal display devices and digital signage. It is preferably used for a liquid crystal display device for use.
  • the polarizing plate according to the present invention is bonded to a liquid crystal cell via the adhesive layer or the like.
  • the polarizing plate according to the present invention is a reflective type, transmissive type, transflective LCD or TN type, STN type, OCB type, HAN type, VA type (PVA type, MVA type), IPS type (including FFS type), etc. It is preferably used in LCDs of various driving methods. In particular, in a large-screen display device having a screen of 30 or more, especially 30 to 54, there is no white spot at the periphery of the screen and the effect is maintained for a long time.
  • Example 1 [Preparation of acrylic resin] The following acrylic resins A1-A10 and MS1 and MS2 were prepared by known methods.
  • A1: Monomer mass ratio (MMA: MA 98: 2), Mw 70000 Methyl methacrylate monomer content 0.55%
  • A2: monomer mass ratio (MMA: MA 97: 3), Mw 160000 Methyl methacrylate monomer content 0.53%
  • A3: monomer mass ratio (MMA: MA 97: 3), Mw350,000 Methyl methacrylate monomer content 0.52%
  • A4: monomer mass ratio (MMA: MA 97: 3), Mw550,000 Methyl methacrylate monomer content 0.61%
  • A5: monomer mass ratio (MMA: MA 97: 3), Mw 800000 Methyl methacrylate monomer content 0.75%
  • A6: monomer mass ratio (MMA: MA 97: 3), Mw 930,000 Methyl methacrylate monomer content 0.80%
  • A7: monomer mass ratio (MMA: MA 94: 6), Mw1100000 Methyl methacrylate monomer content 0.99%
  • Methyl methacrylate monomer content 0.21% A9 The resin of A3 was dissolved in methyl ethyl ketone, reprecipitated with ethanol, washed and dried to remove the methyl methacrylate monomer.
  • MMA Methyl methacrylate MA: Methyl acrylate ST: Styrene
  • the produced dope liquid was uniformly cast on a stainless steel band support at a temperature of 22 ° C. and a width of 2 m using a belt casting apparatus. With the stainless steel band support, the solvent was evaporated until the residual solvent amount reached 100%, and the film was peeled off from the stainless steel band support with a peeling tension of 162 N / m.
  • the solvent was evaporated from the peeled acrylic resin web at 35 ° C. and slit to a width of 1.6 m. Thereafter, the film was stretched 1.3 times in the width direction at a stretching temperature of 140 ° C. in the first half of the tenter process, and the stress of the film was relaxed while maintaining the width in the second half of the tenter process.
  • the residence time in the tenter process was 20 seconds.
  • the residual solvent amount when starting stretching with a tenter was 10%.
  • drying was performed while the drying zone was conveyed by a number of rolls.
  • the web is dried at a tension of 160 N / cm 2 , a temperature of 100 ° C. and a residence time of 5 minutes, and in the latter half, a tension of 160 N / cm 2 , a temperature of 110 ° C. and a residence time of 5 minutes. did.
  • the optical film 1 which is an acrylic resin film was obtained.
  • the draw ratio in the MD direction calculated from the rotational speed of the stainless steel band support and the operating speed of the tenter was 1.1 times.
  • the residual solvent amount of the optical film 1 shown in Table 1 was 0.1%, the film thickness was 40 ⁇ m, and the winding length was 4000 m.
  • Tables 4 and 5 show the types and composition ratios of the acrylic resin (A) and cellulose ester resin (B) described in Tables 1 and 2, the tenter process conditions described in Table 3, and the subsequent drying process conditions as shown in Tables 4 and 5.
  • Optical films 2 to 50 and 101 to 123 were produced in the same manner as in the production of the optical film 1 except that they were combined.
  • acyl groups of the cellulose ester resins shown in Tables 1 and 2 are as follows: ac is an acetyl group, pr is a propionyl group, bu is a butyryl group, pen is a pentanoyl group, bz is a benzoyl group, hep is a heptanoyl group, and oct is Octanoyl group, ph represents a phthalyl group.
  • the optical film was cut out at 120 mm (length) ⁇ 10 mm (width) and continuously heated at a heating rate of 30 ° C./min while pulling with a tension of 10 N, and the temperature at 9 N was measured three times. Averaged.
  • ⁇ Cannot be folded 3 times
  • ⁇ Can be folded at least 1 out of 3 times (phase difference: measurement of retardation)
  • a 35 mm ⁇ 35 mm sample was cut from each optical film, conditioned at 25 ° C. and 55% RH for 2 hours, and measured with an automatic birefringence meter (KOBRA21DH, Oji Scientific Co., Ltd.) from the vertical direction at 590 nm and the film surface.
  • the following Ro and Rt were calculated from the extrapolated values of retardation values measured in the same manner while tilting.
  • Ro (590) (nx ⁇ ny) ⁇ d (nm)
  • Rt (590) ⁇ (nx + ny) / 2 ⁇ nz ⁇ ⁇ d (nm)
  • Ro (590) represents the in-plane retardation value in the film at a wavelength of 590 nm
  • Rt (590) represents the retardation value in the thickness direction in the film at 590 nm
  • D represents the thickness (nm) of the optical film
  • nx represents the maximum refractive index in the plane of the film at 590 nm, and is also referred to as the refractive index in the slow axis direction.
  • ny represents the refractive index in the direction perpendicular to the slow axis in the film plane at 590 nm
  • nz represents the refractive index of the film in the thickness direction at 590 nm.
  • ⁇ The tear surface is very smooth and is torn straight.
  • a 120- ⁇ m-thick long roll polyvinyl alcohol film was immersed in 100 parts by mass of an aqueous solution containing 1 part by mass of iodine and 4 parts by mass of boric acid, and stretched in the transport direction 5 times at 50 ° C. to produce a polarizing film.
  • the optical film 1 produced in Example 1 was subjected to a corona treatment using an acrylic adhesive on one side of the polarizing film, and then bonded.
  • KC8UCR-5 manufactured by Konica Minolta Opto Co., Ltd., which is an alkali saponified retardation film, was bonded to the other surface of the polarizing film and dried to prepare a polarizing plate P1.
  • polarizing plates P2 to P50 and P101 to P123 were produced using the optical films 2 to 50 and 101 to 123, respectively.
  • the polarizing plate using the optical film of the present invention was excellent in film cutting property and easy to process.
  • the viewing angle of the liquid crystal display device was measured using EZ-Contrast 160D manufactured by ELDIM in an environment of 23 ° C. and 55% RH. Subsequently, a sample obtained by treating the polarizing plate at 60 ° C. and 90% RH for 1000 hours was measured in the same manner, and evaluated according to the following criteria.
  • ⁇ No change in viewing angle ⁇ : A little change in viewing angle is observed ⁇ : Large viewing angle change (Color shift: Evaluation of heat and moisture resistance as a polarizing plate protective film)
  • the display was displayed in black in an environment of 23 ° C. and 55% RH, and observed from an oblique angle of 45 °. Subsequently, the polarizing plate treated at 60 ° C. and 90% RH for 1000 hours was observed in the same manner, and the color change was evaluated according to the following criteria.
  • the optical film of the present invention exhibited low hygroscopic properties, transparency, high heat resistance, and excellent brittleness improvement. Moreover, the polarizing plate and liquid crystal display device produced using the optical film of the present invention exhibited excellent properties in visibility and color shift.
  • Example 2 [Preparation of acrylic particles] ⁇ Preparation of acrylic particles (C1)> A reactor with a reflux condenser with an internal volume of 60 liters was charged with 38.2 liters of ion-exchanged water and 111.6 g of sodium dioctylsulfosuccinate, and the temperature was raised to 75 ° C. in a nitrogen atmosphere while stirring at 250 rpm. The effect of oxygen was virtually eliminated.
  • the polymer latex thus obtained was poured into a 3% by mass aqueous sodium sulfate solution, salted out and coagulated, then dehydrated and washed repeatedly and then dried to obtain a three-layer acrylic particle ( C1) was obtained.
  • the average particle size was determined by the absorbance method, it was 100 nm.
  • an optical film 38-1 was produced in the same manner as in the method for producing the optical film 38 described in Example 1.
  • the optical film 38- was prepared in the same manner as the optical film 38 except that the acrylic resin (A), the cellulose ester resin (B), the acrylic particles (C), and the composition ratio were changed as shown in Table 6. 2 to 38-6 were produced.
  • optical film 38-5 is metablene W-341 (manufactured by Mitsubishi Rayon Co., Ltd.) as C2 instead of the acrylic particles C1
  • optical film 38-6 is MR-2G (manufactured by Soken Chemical Co., Ltd.) having a single layer structure. Used as C3.
  • this insoluble material was dispersed again in a solvent, and the particle size distribution was measured using Malvern (manufactured by Malvern). As a result, a distribution was observed in the vicinity of 0.10 to 0.20 ⁇ m.
  • Example 3 Optical films 5-1 and 5-2 were prepared in the same manner as in Example 1 except that the following ultraviolet absorber was added when preparing the dope of the optical film 5, and a liquid crystal display device was prepared in the same manner as in Example 1. Produced.
  • the optical film of the present invention even when the optical film of the present invention is used, it is possible to appropriately add the additives used in the conventional polarizing plate protective film, and the polarizing plate produced thereby, the liquid crystal display device, Furthermore, it showed excellent properties in visibility and color shift.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polarising Elements (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Cette invention concerne un film optique démontrant une faible absorbance d'humidité, doué de transparence, d'une résistance élevée à la chaleur et d'une fragilité améliorée, en particulier, un film optique qui peut être utilisé comme un film de protection pour une plaque de polarisation. Le film optique selon l'invention est produit par un procédé de coulée en solution, et présente les caractéristiques (i) à (iv) suivantes : (i) une résine acrylique et une résine ester de cellulose sont contenues dans un rapport en poids spécifié, (ii) un monomère méthacrylate de méthyle est contenu en un pourcentage en poids spécifié, (iii) la résine acrylique a un poids moléculaire moyen en poids d'une valeur spécifiée ou plus et la teneur du monomère méthacrylate de méthyle dans la résine acrylique est un pourcentage en poids spécifié ; et (iv) le degré total de substitution des groupes acyle dans la résine ester de cellulose s'inscrit dans une plage spécifiée, le degré de substitution des groupes acyle ayant chacun le nombre d'atomes de carbone spécifié dans la résine ester de cellulose s'inscrit dans une plage spécifiée, et le poids moléculaire moyen en poids de la résine ester de cellulose est une valeur spécifiée ou plus.
PCT/JP2010/053641 2009-04-10 2010-03-05 Film optique Ceased WO2010116830A1 (fr)

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Cited By (3)

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WO2013028403A1 (fr) * 2011-08-23 2013-02-28 Dow Global Technologies Llc Composition de polymère à étages multiples et films et plaques de polariseur fabriqués à partir de celui-ci
WO2014203637A1 (fr) * 2013-06-17 2014-12-24 コニカミノルタ株式会社 Plaque de polarisation et dispositif d'affichage à cristaux liquides
JPWO2015064732A1 (ja) * 2013-11-01 2017-03-09 富士フイルム株式会社 偏光板保護フィルム、ドープ組成物、偏光板保護フィルムの製造方法、偏光板ならびに液晶表示装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6024662B2 (ja) * 2011-09-05 2016-11-16 コニカミノルタ株式会社 光学フィルムの製造方法

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JPH05119217A (ja) * 1991-10-23 1993-05-18 Kanegafuchi Chem Ind Co Ltd 偏光膜保護用フイルム
JP2002356658A (ja) * 2001-05-31 2002-12-13 Nippon Carbide Ind Co Inc アクリル系オーバーレイフィルム
JP2003012859A (ja) * 2001-06-29 2003-01-15 Konica Corp セルロースエステルフィルム、偏光板用保護フィルム及び偏光板
WO2008126528A1 (fr) * 2007-03-12 2008-10-23 Konica Minolta Opto, Inc. Procédé pour produire un film anti-reflet et anti-éblouissement, film anti-reflet et anti-éblouissement, polariseur et dispositif d'affichage

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Publication number Priority date Publication date Assignee Title
JPH05119217A (ja) * 1991-10-23 1993-05-18 Kanegafuchi Chem Ind Co Ltd 偏光膜保護用フイルム
JP2002356658A (ja) * 2001-05-31 2002-12-13 Nippon Carbide Ind Co Inc アクリル系オーバーレイフィルム
JP2003012859A (ja) * 2001-06-29 2003-01-15 Konica Corp セルロースエステルフィルム、偏光板用保護フィルム及び偏光板
WO2008126528A1 (fr) * 2007-03-12 2008-10-23 Konica Minolta Opto, Inc. Procédé pour produire un film anti-reflet et anti-éblouissement, film anti-reflet et anti-éblouissement, polariseur et dispositif d'affichage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013028403A1 (fr) * 2011-08-23 2013-02-28 Dow Global Technologies Llc Composition de polymère à étages multiples et films et plaques de polariseur fabriqués à partir de celui-ci
US9156976B2 (en) 2011-08-23 2015-10-13 Rohm And Haas Company Multi-stage polymer composition and films and polarizer plates made therefrom
WO2014203637A1 (fr) * 2013-06-17 2014-12-24 コニカミノルタ株式会社 Plaque de polarisation et dispositif d'affichage à cristaux liquides
JPWO2015064732A1 (ja) * 2013-11-01 2017-03-09 富士フイルム株式会社 偏光板保護フィルム、ドープ組成物、偏光板保護フィルムの製造方法、偏光板ならびに液晶表示装置
US9751999B2 (en) 2013-11-01 2017-09-05 Fujifilm Corporation Polarizing plate protective film, dope composition, method for manufacturing polarizing plate protective film, polarizing plate, and liquid crystal display device

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