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WO2015137367A1 - Corps de rouleau de film optique et son procédé de fabrication, plaque polarisante, et dispositif d'affichage à cristaux liquides - Google Patents

Corps de rouleau de film optique et son procédé de fabrication, plaque polarisante, et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2015137367A1
WO2015137367A1 PCT/JP2015/057078 JP2015057078W WO2015137367A1 WO 2015137367 A1 WO2015137367 A1 WO 2015137367A1 JP 2015057078 W JP2015057078 W JP 2015057078W WO 2015137367 A1 WO2015137367 A1 WO 2015137367A1
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WIPO (PCT)
Prior art keywords
optical film
film
group
liquid crystal
roll body
Prior art date
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Ceased
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PCT/JP2015/057078
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English (en)
Japanese (ja)
Inventor
真一郎 鈴木
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Konica Minolta Inc
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Konica Minolta Inc
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Priority to JP2016507771A priority Critical patent/JPWO2015137367A1/ja
Priority to KR1020167024448A priority patent/KR20160119159A/ko
Priority to CN201580013103.4A priority patent/CN106068299A/zh
Publication of WO2015137367A1 publication Critical patent/WO2015137367A1/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
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/06—Ethers; Acetals; Ketals; Ortho-esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/07—Aldehydes; Ketones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C08K5/098—Metal salts of carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C08K5/101—Esters; Ether-esters of monocarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/20—Carboxylic acid amides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/37—Thiols
    • C08K5/372—Sulfides, e.g. R-(S)x-R'
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/08—Cellulose derivatives
    • C08L1/10—Esters of organic acids, i.e. acylates
    • C08L1/12—Cellulose acetate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/414—Winding
    • B65H2301/4143—Performing winding process
    • B65H2301/41432—Performing winding process special features of winding process
    • B65H2301/414322—Performing winding process special features of winding process oscillated winding, i.e. oscillating the axis of the winding roller or material
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements

Definitions

  • the present invention relates to a roll body of an optical film, a manufacturing method thereof, a polarizing plate and a liquid crystal display device.
  • liquid crystal display devices as liquid crystal displays for mobile devices such as smartphones and tablet terminals.
  • Such a liquid crystal display device is required to be thin, and an optical film such as a polarizing plate protective film constituting the liquid crystal display device is also required to be thin.
  • a cellulose ester film is used as the polarizing plate protective film.
  • Such a film is generally stored as a roll obtained by winding a long film into a roll around a core after producing a long film by a solution casting method or the like. And in order to suppress the shift
  • the present inventors have found that the roll body is easily deformed particularly when a thin film is wound by a normal method.
  • the deformation of the roll body in the present invention means that the winding diameter at both ends in the width direction of the film where the embossed portions overlap each other is significantly larger than the winding diameter at the central portion in the width direction of the film and bends in the vertical direction. It means that such a big wrinkle occurs.
  • Such deformation of the roll body can be improved by performing a winding method (oscillate winding) while applying vibration as described above.
  • the films are periodically vibrated in the width direction, so that the films easily rub against each other; in particular, the embossed part and the film surface on which the embossed part is not provided.
  • the film surface on which the embossed portion was not provided was likely to be finely scratched and haze was likely to increase.
  • a film having increased haze tends to deteriorate display performance such as contrast of a liquid crystal display device.
  • This invention is made
  • L is an ester bond, an amide bond, a carbonyl group, or one or more selected from the group consisting of an ester bond, an amide bond or a carbonyl group and an alkylene group, a nitrogen atom, an oxygen atom, a sulfur atom, a zinc atom, a calcium atom, and a magnesium atom.
  • R 1 represents an alkyl group having 8 to 26 carbon atoms, or an alkenyl group having 8 to 26 carbon atoms
  • R 2 represents a hydrogen atom, an alkyl group having 8 to 26 carbon atoms, or an alkenyl group having 8 to 26 carbon atoms
  • R 1 and R 2 in the general formula (1) are each independently a linear alkyl group having 8 to 26 carbon atoms, or a straight chain alkenyl having 8 to 26 carbon atoms.
  • Formula (I) Ro (nx ⁇ ny) ⁇ t (nm)
  • Formula (II) Rth ⁇ (nx + ny) / 2 ⁇ nz ⁇ ⁇ t (nm)
  • nx represents the refractive index in the slow axis direction x where the refractive index is maximum in the in-plane direction of the film
  • ny represents the refractive index in the direction y perpendicular to the slow axis direction x in the in-plane direction of the film.
  • Nz represents the refractive index in the thickness direction z of the film;
  • t (nm) represents the thickness of the film)
  • a cellulose ester and 0.05 to 5 parts by mass of a compound represented by the following general formula (1) with respect to 100 parts by mass of the cellulose ester, and embossed portions are provided at both ends in the width direction Preparing a long optical film having a thickness of 15 to 45 ⁇ m;
  • L is an ester bond, an amide bond, a carbonyl group, or one or more selected from the group consisting of an ester bond, an amide bond or a carbonyl group and an alkylene group, a nitrogen atom, an oxygen atom, a sulfur atom, a zinc atom, a calcium atom, and a magnesium atom.
  • R 1 represents an alkyl group having 8 to 26 carbon atoms or an alkenyl group having 8 to 26 carbon atoms;
  • R 2 represents a hydrogen atom, an alkyl group having 8 to 26 carbon atoms, or an alkenyl group having 8 to 26 carbon atoms)
  • Winding the optical film into a roll around a core The winding step includes a step of winding the optical film around the core while periodically vibrating at least one of the optical film and the core in the width direction of the optical film.
  • Body manufacturing method includes a step of winding the optical film around the core while periodically vibrating at least one of the optical film and the core in the width direction of the optical film.
  • a polarizing plate comprising an optical film obtained from the roll according to any one of [1] to [6].
  • a liquid crystal display device comprising an optical film obtained from the roll body according to any one of [1] to [6].
  • a first polarizing plate, a liquid crystal cell, a second polarizing plate, and a backlight are included in this order, and the first polarizing plate includes the first polarizer and the first polarizer.
  • the liquid crystal display device including a protective film F1 disposed on the surface opposite to the liquid crystal cell and a protective film F2 disposed on the liquid crystal cell side surface of the first polarizer, The second polarizer, the protective film F3 disposed on the surface of the second polarizer on the liquid crystal cell side, and the surface of the second polarizer on the surface opposite to the liquid crystal cell.
  • the liquid crystal display device including a protective film F4, wherein at least one of the protective films F2 and F3 includes the optical film.
  • the liquid crystal display device is an IPS mode or FFS mode liquid crystal cell.
  • the liquid crystal display device according to any one of [9] to [11], wherein the diagonal length of the display area is 10 inches or less.
  • the liquid crystal display device further including a rechargeable battery.
  • the present invention it is possible to provide a roll body of an optical film in which deformation of the roll body is suppressed and an increase in haze is suppressed.
  • the deformation of the roll of the optical film can be improved by winding the optical film while periodically vibrating the film or the core in the width direction of the film (oscillate winding).
  • the optical film is periodically vibrated in the width direction, so that the films are rubbed with each other and fine scratches are easily formed on the film surface on which the embossed portion is not formed, and haze is likely to increase.
  • the present inventors can impart good slipperiness to the film while allowing the optical film to contain the compound represented by the general formula (1), while being well compatible with the cellulose ester. I found it. Thereby, it discovered that the increase in the haze of an optical film can be suppressed, suppressing a deformation
  • the optical film of the present invention preferably contains a cellulose ester and a compound represented by the general formula (1).
  • optical film of this invention contains a cellulose ester and the compound represented by General formula (1) as above-mentioned.
  • the cellulose ester is a compound obtained by esterifying cellulose and at least one of an aliphatic carboxylic acid having 2 to 22 carbon atoms and an aromatic carboxylic acid.
  • cellulose ester examples include cellulose triacetate, cellulose diacetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, cellulose acetate butyrate, cellulose benzoate, and cellulose acetate benzoate. Among them, those having low retardation are preferable, and cellulose triacetate is preferable.
  • the total degree of substitution of acyl groups in the cellulose ester is about 2.0 to 3.0, preferably 2.5 to 3.0, more preferably 2.7 to 3.0, and even more preferably 2.8 to 3.0. 2.95. In order to reduce the retardation development property, it is preferable to increase the total substitution degree of the acyl group.
  • the number of carbon atoms of the acyl group contained in the cellulose ester is preferably 2 to 7, and more preferably 2 to 4.
  • the acyl group contained in the cellulose ester preferably contains an acetyl group.
  • the substitution degree of the acyl group having 3 or more carbon atoms is preferably 0.9 or less, and more preferably 0.
  • the degree of substitution of the acyl group of the cellulose ester can be measured by the method prescribed in ASTM-D817-96.
  • the weight average molecular weight of the cellulose ester is preferably 5.0 ⁇ 10 4 to 5.0 ⁇ 10 5 in order to obtain a certain level of mechanical strength, and 1.0 ⁇ 10 5 to 3.0 ⁇ . 10 5 is more preferable, and 1.5 ⁇ 10 5 to 2.9 ⁇ 10 5 is even more preferable.
  • the molecular weight distribution (weight average molecular weight Mw / number average molecular weight Mn) of the cellulose ester is preferably 1.0 to 4.5.
  • the weight average molecular weight and molecular weight distribution of the cellulose ester can be measured by gel permeation chromatography (GPC).
  • the measurement conditions are as follows. Solvent: Methylene chloride Column: Three Shodex K806, K805, K803G (manufactured by Showa Denko KK) are connected and used.
  • the compound represented by the general formula (1) may have a function of increasing the slipperiness of the film.
  • L in the general formula (1) includes at least an ester bond (—C ( ⁇ O) O—), an amide bond (—C ( ⁇ O) NH—) or a carbonyl group (—C ( ⁇ O) —).
  • These carbonyl groups can impart good affinity with the cellulose ester to the compound represented by the general formula (1).
  • L is an ester bond, an amide bond, a carbonyl group, or “from an ester bond, an amide bond or a carbonyl group, an alkylene group, a nitrogen atom, an oxygen atom, a sulfur atom, a zinc atom, a calcium atom, and a magnesium atom.
  • R 1 in the general formula (1) represents an alkyl group having 8 to 26 carbon atoms or an alkenyl group having 8 to 26 carbon atoms.
  • the number of carbon atoms in the alkyl group and alkenyl group is more preferably 10 or more and 26 or less because good slipperiness is easily obtained.
  • the alkyl group and alkenyl group may be linear or branched, and are preferably linear because good slipperiness is easily obtained.
  • R 2 in the general formula (1) represents a hydrogen atom, an alkyl group having 8 to 26 carbon atoms, or an alkenyl group having 8 to 26 carbon atoms; An alkyl group having 8 to 26 carbon atoms or an alkenyl group having 8 to 26 carbon atoms.
  • the number of carbon atoms in the alkyl group and alkenyl group is more preferably 10 or more and 26 or less because good slipperiness is easily obtained.
  • the alkyl group and alkenyl group may be linear or branched, and are preferably linear because good slipperiness is easily obtained.
  • —LR 2 can be —C ( ⁇ O) OH, —C ( ⁇ O) NH 2 or the like.
  • R 1 and R 2 may further have a substituent such as an OH group, if necessary.
  • R 1 and R 2 may be the same as or different from each other.
  • Examples of the compound represented by the general formula (1) include the following.
  • the content of the compound represented by the general formula (1) is preferably 0.05 to 5 parts by mass, more preferably 0.1 to 3 parts by mass with respect to 100 parts by mass of the cellulose ester.
  • the content of the compound represented by the general formula (1) is a certain level or more, sufficient slipperiness can be imparted to the film. Thereby, even if the vibration winding process mentioned later is performed, the increase in the external haze of the film obtained can be suppressed.
  • the content of the compound represented by the general formula (1) is below a certain level, it is possible to suppress the roll shape from being lowered due to the optical film becoming excessively slippery.
  • the optical film of the present invention may further contain a polyester compound in order to adjust the plasticity and retardation of the film.
  • the polyester compound is a compound obtained by polycondensation of a dicarboxylic acid and a diol.
  • the dicarboxylic acid may be one or more selected from the group consisting of aliphatic dicarboxylic acids, alicyclic dicarboxylic acids, and aromatic dicarboxylic acids.
  • the diol may be one or more selected from the group consisting of aliphatic diols, alkyl ether diols, alicyclic diols, and aromatic diols.
  • a group consisting of a dicarboxylic acid selected from the group consisting of an aliphatic dicarboxylic acid and an alicyclic dicarboxylic acid, an aliphatic diol, an alkyl ether diol, and an alicyclic diol because the retardation can be made difficult to develop.
  • a polyester compound obtained by polycondensation with a more selected diol is preferred; a polyester compound (aliphatic polyester compound) obtained by polycondensation of an aliphatic dicarboxylic acid and an aliphatic diol is more preferred.
  • the polyester compound is preferably represented by the general formula (2) or (3).
  • G in the general formula (2) represents a group derived from an aliphatic diol or an alkyl ether diol.
  • the aliphatic diol preferably has 2 to 12 carbon atoms.
  • Examples of aliphatic diols include ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1, 5-pentanediol, 1,6-hexanediol, 1,5-pentylene glycol and the like, preferably ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, and 1,6-hexanediol.
  • the alkyl ether diol preferably has 4 to 12 carbon atoms.
  • Examples of the alkyl ether diol include diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol and the like.
  • One type of aliphatic diol or alkyl ether diol may be used, or two or more types may be combined.
  • a in the general formula (2) represents a group derived from an aliphatic dicarboxylic acid or an alicyclic dicarboxylic acid.
  • the aliphatic dicarboxylic acid preferably has 4 to 12 carbon atoms.
  • Examples of the aliphatic dicarboxylic acid include malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid and the like.
  • One type of aliphatic dicarboxylic acid or alicyclic dicarboxylic acid may be used, or two or more types may be combined.
  • B 1 in the general formula (2) represents a group derived from an aliphatic monocarboxylic acid or an alicyclic monocarboxylic acid.
  • the aliphatic monocarboxylic acid preferably has 1 to 12 carbon atoms.
  • Examples of aliphatic monocarboxylic acids include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, 2-ethyl-hexanecarboxylic acid, undecylic acid, lauric acid , Saturated fatty acids such as tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, heptadecylic acid, stearic acid, nonadecanoic acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, heptacosanoic acid, montanic acid, melicic
  • B 1 , G and A in the general formula (2) do not contain an aromatic ring in order to make it difficult to develop a phase difference.
  • m represents the number of repetitions, and is preferably 1 or more and 170 or less.
  • polyester compound represented by the general formula (2) examples include those shown in Table 1.
  • G and A in the general formula (3) are defined similarly to G and A in the general formula (2), respectively.
  • B 2 in the general formula (3) represents a group derived from an aliphatic monoalcohol or an alicyclic monoalcohol.
  • the aliphatic monoalcohol preferably has 1 to 12 carbon atoms. Examples of aliphatic monoalcohol include methanol, ethanol, propanol, isopropanol, etc .; examples of alicyclic monoalcohol include cyclohexyl alcohol and the like.
  • n represents the number of repetitions and is preferably 1 or more and 170 or less.
  • polyester compound represented by the general formula (3) examples include those shown in Table 2.
  • the weight average molecular weight Mw of the polyester compound is preferably 20000 or less, more preferably 5000 or less, and still more preferably 3000 or less from the viewpoint of improving the compatibility with the cellulose ester.
  • the weight average molecular weight Mw of the polyester compound may be 400 or more, preferably 700 or more, more preferably 1000 or more.
  • the content of the polyester compound is preferably 1 to 45% by mass, more preferably 2 to 30% by mass with respect to the cellulose ester, from the viewpoint of easy adjustment of the plasticity and retardation of the film. More preferably, it is ⁇ 25% by mass, and most preferably 10 ⁇ 20% by mass.
  • the optical film of the present invention may further contain various additives such as an ultraviolet absorber, a plasticizer, a peeling aid, a matting agent (fine particles), and an impact reinforcement as necessary.
  • various additives such as an ultraviolet absorber, a plasticizer, a peeling aid, a matting agent (fine particles), and an impact reinforcement as necessary.
  • the ultraviolet absorber may be a benzotriazole compound, a 2-hydroxybenzophenone compound, a salicylic acid phenyl ester compound, or the like.
  • 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2H-benzotriazole, 2- Triazoles such as (3,5-di-t-butyl-2-hydroxyphenyl) benzotriazole, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2,2'-dihydroxy-4 -Benzophenones such as methoxybenzophenone.
  • the UV absorber may be a commercially available product.
  • examples thereof include Tinuvin 109, Tinuvin 171, Tinuvin 234, Tinuvin 326, Tinuvin 327, Tinuvin 328, and Tinuvin 928 manufactured by BASF Japan, or 2, 2'-methylenebis [6- (2H-benzotriazol-2-yl) -4- (1,1,3,3-tetramethylbutyl) phenol] (molecular weight 659; examples of commercially available products are manufactured by ADEKA Corporation LA31) and the like.
  • an ultraviolet inhibitor is not essential.
  • the content of the absorbent can be about 0 to 0.5% by mass with respect to the cellulose ester.
  • the content of the ultraviolet light inhibitor is cellulose.
  • the mass ratio can be about 1 ppm to 5.0%, preferably about 0.5 to 3.0% with respect to the ester.
  • the matting agent can impart further slipperiness to the optical film.
  • the matting agent may be fine particles made of an inorganic compound or an organic compound having heat resistance in the film forming process without impairing the transparency of the resulting film.
  • inorganic compounds constituting the matting agent include silicon dioxide (silica), titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, and hydrated calcium silicate. , Aluminum silicate, magnesium silicate and calcium phosphate. Of these, silicon dioxide and zirconium oxide are preferable, and silicon dioxide is more preferable in order to reduce an increase in haze of the obtained film.
  • silicon dioxide examples include Aerosil 200V, Aerosil R972V, Aerosil R972, R974, R812, 200, 300, R202, OX50, TT600, NAX50 (above, Nippon Aerosil Co., Ltd.), Sea Hoster KEP-10, Sea Hoster KEP -30, Seahoster KEP-50 (manufactured by Nippon Shokubai Co., Ltd.), Silo Hovic 100 (manufactured by Fuji Silysia), nip seal E220A (manufactured by Nippon Silica Kogyo), Admafine SO (manufactured by Admatechs) and the like.
  • the particle shape of the matting agent is indefinite, needle-like, flat or spherical, and may preferably be spherical in view of easy transparency of the resulting film.
  • the matting agent may be used alone or in combination of two or more. Further, by using particles having different particle diameters and shapes (for example, needle shape and spherical shape, for example), both transparency and slipperiness may be made highly compatible.
  • the size of the particles of the matting agent is preferably smaller than the wavelength of visible light. / 2 or less is preferable. However, if the size of the particles is too small, the effect of improving slipperiness may not be manifested. Therefore, the size of the particles is preferably in the range of 80 to 180 nm.
  • the particle size means the size of an aggregate when the particle is an aggregate of primary particles. When the particles are not spherical, the size of the particles means the diameter of a circle corresponding to the projected area.
  • the content of the matting agent can be about 0.05 to 1.0% by mass, preferably 0.1 to 0.8% by mass with respect to the cellulose ester.
  • the optical film of the present invention includes a compound represented by the general formula (1).
  • the slipperiness of the film when winding the optical film by oscillating winding can be enhanced.
  • increase in haze due to fine scratches on the film surface by rubbing the films can be suppressed.
  • the haze of the optical film is preferably 0.5% or less, and more preferably 0.3% or less.
  • the haze of the optical film means the total haze that combines the external haze and the internal haze. When the haze of the optical film is in the above range, good contrast can be easily obtained in the display device.
  • the haze of the optical film can be measured by the following procedure. That is, the film is drawn out from the roll body of the optical film, cut into 10 points and 4 cm ⁇ 4 cm at equal intervals in the width direction, and conditioned at 23 ° C. and 55% RH, respectively.
  • the haze of the obtained film is measured with a haze meter (turbidimeter) (model: NDH 2000, manufactured by Nippon Denshoku Co., Ltd.) in accordance with JIS K-7136.
  • the average value of the ten measured values obtained is defined as “haze”.
  • the haze of the optical film can be adjusted by the type and content of the compound represented by the general formula (1).
  • the number of carbon atoms of the alkyl group or alkenyl group represented by R 1 and R 2 in the general formula (1) be a certain value or linear.
  • the retardation R 0 in the in-plane direction measured under the conditions of a measurement wavelength of 590 nm and 23 ° C. and 55% RH of the optical film is preferably ⁇ 10 nm to 10 nm, and preferably ⁇ 5 nm to 5 nm. More preferred.
  • the retardation Rth in the thickness direction measured under conditions of a measurement wavelength of 590 nm and 23 ° C. and 55% RH of the optical film is preferably from ⁇ 10 nm to 10 nm, and more preferably from ⁇ 5 nm to 5 nm. .
  • An optical film having such a retardation value is suitable as, for example, a retardation film (F2 or F3) of an IPS mode liquid crystal display device.
  • a retardation film F2 or F3
  • F2 or F3 retardation film
  • the contrast and viewing angle of the IPS mode liquid crystal display device can be improved.
  • Retardations R0 and Rth are defined by the following equations, respectively.
  • Formula (I): R 0 (nx ⁇ ny) ⁇ d (nm)
  • Formula (II): Rth ⁇ (nx + ny) / 2 ⁇ nz ⁇ ⁇ d (nm)
  • nx represents the refractive index in the slow axis direction x where the refractive index is maximum in the in-plane direction of the film
  • ny represents the refractive index in the direction y perpendicular to the slow axis direction x in the in-plane direction of the film
  • nz represents the refractive index in the thickness direction z of the film
  • d (nm) represents the thickness of the film)
  • the retardations R0 and Rth can be determined by the following method, for example. 1) The optical film is conditioned at 23 ° C. and 55% RH. The average refractive index of the optical film after humidity adjustment is measured with an Abbe refractometer or the like. The optical film after 2) humidity, measuring the R 0 when the light is incident in parallel to the measurement wavelength 590nm to normal of the film surface, KOBRA21ADH, in Oji Scientific Corporation.
  • the slow axis in the plane of the optical film is set as the tilt axis (rotation axis), and light having a measurement wavelength of 590 nm from the angle normal to the surface of the film (incident angle ( ⁇ ))
  • the retardation value R ( ⁇ ) when incident is measured.
  • the retardation value R ( ⁇ ) can be measured at 6 points every 10 °, with ⁇ ranging from 0 ° to 50 °.
  • the in-plane slow axis is an axis having the maximum refractive index in the film plane, and can be confirmed by KOBRA21ADH.
  • nx, ny, and nz are calculated by KOBRA21ADH from the measured R 0 and R ( ⁇ ) and the above-described average refractive index and film thickness, and Rth at a measurement wavelength of 590 nm is calculated.
  • the measurement of retardation can be performed under conditions of 23 ° C. and 55% RH.
  • the thickness of the optical film is from 15 to 45 ⁇ m, preferably from 15 to 28 ⁇ m, from the viewpoint of thinning the polarizing plate, roll shape, and haze of the film.
  • Roll body of optical film The roll body of the optical film of the present invention is obtained by winding a long optical film in the longitudinal direction of the film.
  • FIG. 1 is a schematic view showing an example of a roll body of the optical film of the present invention.
  • FIG. 1A is a view showing an example of the appearance of a roll body;
  • FIG. 1B is a partial cross-sectional view (cross-sectional view taken along the line AA) along the axial direction of FIG.
  • an optical film roll 10 includes a core 11, and a long optical film 13 wound around the core 11 and having embossed portions 13A at both ends in the width direction. including.
  • the optical film is wound while vibrating at least one of the film or the core in the width direction of the film. Therefore, the roll body 10 obtained includes portions that are laminated so that the embossed portions 13A after winding do not completely overlap each other.
  • the side surface shape of the axial direction both ends of the roll body 10 is wavy. Specifically, the side surface shape of both end portions in the axial direction of the roll body 10 is wavy, as shown in FIG. 1B, the shape of both end portions in the axial direction of the cross section along the axial direction of the roll body. Says that it is wavy.
  • the embossed portion 13A is provided at both ends of the optical film 13 in the width direction.
  • the width of the embossed portion 13A can be, for example, 0.2 to 6%, preferably 0.3 to 2% with respect to the entire width of the optical film 13. Specifically, it may be about 0.5 to 30 mm, preferably 5 to 30 mm, more preferably 6 to 20 mm. If the width of the embossed portion 13A is too small, the transportability of the optical film 13 may not be sufficiently improved, or winding deviation may not be sufficiently suppressed. On the other hand, if the width of the embossed portion 13A is too large, the ratio that can be used as an optical film tends to decrease.
  • the height of the convex portion constituting the embossed portion 13A can be about 5 to 60% of the film thickness of the optical film 13. Specifically, the height of the convex portion constituting the embossed portion 13A is preferably 1.0 to 10.0 ⁇ m, more preferably 1.0 to 6.0 ⁇ m.
  • the height of a convex part means the height from the film surface in which embossing is not formed to the vertex of a convex part. If the height of the embossed portion 13A is too low, there is a possibility that winding deviation in the roll body cannot be sufficiently suppressed. If the embossed portion 13A is too high, the region where the embossed portions overlap in the roll body tends to be thicker than the other regions. Therefore, even if the above-described vibration winding process is performed, deformation of the roll body may not be sufficiently suppressed.
  • FIG. 2 is a schematic diagram showing an example of a cross-sectional shape of the embossed portion 13A.
  • the cross-sectional shape of the embossed portion 13A include a rectangular shape (FIG. 2 (a)); a shape in which a concave portion a is formed in the central portion in the width direction of the embossed portion 13A lower than both end portions in the width direction (FIG. )); Includes a plurality of convex portions b and c, and the convex portion b in the central portion in the width direction of the embossed portion is lower than the convex portions c at both end portions in the width direction (FIG. 2C). .
  • the overlap of the width direction center part of an embossed part can be made small by making the width direction center part of an embossed part low. Thereby, it is thought that the increase in the thickness of the embossed portion of the roll body can be reduced, and the deformation of the roll body can be further suppressed.
  • the width of the optical film 13 can be, for example, 1000 to 6000 mm, preferably 1400 to 4000 mm.
  • the winding length of the optical film 13 can be set to 100 to 10,000 m, for example.
  • the roll body of the optical film of the present invention includes: 1) a step of preparing a long optical film having embossed portions at both ends in the width direction; and 2) a step of winding up the optical film. including. And 2) the step of winding up the optical film includes the step of winding the optical film around the core (vibrating winding step) while periodically vibrating at least one of the optical film and the core in the width direction of the film. It is preferable to include.
  • the long optical film is manufactured by a solution casting method (cast) or a melt casting method (melt); preferably, by a solution casting method (cast) in order to reduce streak failure. sell.
  • a method for producing a long optical film by a solution casting method includes: 1-1) a step of obtaining a dope containing a cellulose ester; and 1-2) drying the dope after casting the dope on a support.
  • a step of obtaining a film-like material 1-3) a step of peeling the film-like material from the support, and 1-5) a step of forming embossed portions at both ends in the width direction of the peeled film-like material.
  • the organic solvent used for the preparation of the dope solution can be used without limitation as long as it can sufficiently dissolve the above components such as cellulose ester.
  • the chlorinated organic solvent include methylene chloride.
  • the non-chlorine organic solvent include methyl acetate, ethyl acetate, amyl acetate, acetone, tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, cyclohexanone, ethyl formate and the like. Of these, methylene chloride is preferred.
  • the dope preferably further contains 1 to 40% by mass of a linear or branched aliphatic alcohol having 1 to 4 carbon atoms in addition to the organic solvent.
  • a linear or branched aliphatic alcohol having 1 to 4 carbon atoms include methanol, ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, tert-butanol and the like. Of these, methanol and ethanol are preferable because the stability of the dope, the boiling point is relatively low, and the drying property is good.
  • Dissolution of cellulose ester and the like includes a method performed at normal pressure, a method performed below the boiling point of the main solvent, a method performed under pressure above the boiling point of the main solvent, and a method performed under pressure above the boiling point of the main solvent. Is preferred.
  • the dope solution is fed to a pressure die through a liquid feed pump (for example, a pressurized metering gear pump). Then, the dope solution is cast from the slit of the pressure die to a casting position on an endless metal support (for example, a stainless belt or a rotating metal drum) that is transferred infinitely.
  • a liquid feed pump for example, a pressurized metering gear pump
  • the dope solution on the metal support is preferably dried in an atmosphere within a range of 40 to 100 ° C.
  • the surface temperature of the metal drum is set to ⁇ 20 to 10 ° C. and the film is peeled off without being dried on the metal drum.
  • the film-like material obtained on the metal support is peeled off at the peeling position.
  • the temperature of the metal support at the peeling position is preferably in the range of 10 to 40 ° C, more preferably in the range of 11 to 30 ° C.
  • the temperature of the metal support at the peeling position is preferably in the range of ⁇ 20 to 10 ° C.
  • the residual solvent amount of the film-like material on the metal support at the time of peeling can be, for example, in the range of 50 to 120% by mass.
  • the heat treatment for measuring the residual solvent amount represents performing a heat treatment at 140 ° C. for 1 hour.
  • the peeling tension when peeling the metal support from the film is usually in the range of 196 to 245 N / m. However, if wrinkles easily occur during peeling, peeling with a tension of 190 N / m or less is preferable. Further, it is more preferable to peel with a tension of 80 N / m or less.
  • the peeled film-like material is dried while being conveyed in the tenter stretching apparatus, or is dried while being conveyed by a plurality of rollers disposed in the drying apparatus.
  • the drying method is not particularly limited, but a method of blowing hot air on both surfaces of the film-like material is common.
  • drying at a high temperature is preferably performed under conditions where the residual solvent is 8% by mass or less.
  • the drying temperature is preferably in the range of 40-190 ° C, more preferably in the range of 40-170 ° C.
  • the film obtained after drying may be further stretched as necessary.
  • the stretching of the film is preferably performed in at least one of the width direction (TD direction), the transport direction (MD direction) or the oblique direction of the film; more preferably in the width direction (TD direction).
  • stretching in both the width direction (TD direction) and the transport direction (MD direction) of the film stretching in the width direction (TD direction) of the film and stretching in the transport direction (MD direction) may be performed sequentially. You may do it simultaneously.
  • the draw ratio may be about 1.01 to 1.5 times, preferably about 1.01 to 1.3 times in each direction.
  • the residual solvent amount of the film-like material at the start of tenter stretching is preferably 2 to 30% by mass. Furthermore, it is preferable to dry until the amount of residual solvent in the film-like material is 10% by mass or less, preferably 5% by mass or less.
  • the drying temperature is preferably in the range of 30 to 160 ° C, more preferably in the range of 50 to 150 ° C.
  • the tenter method includes a clip tenter and a pin tenter. In the present invention, a pin tenter is preferable from the viewpoint of productivity.
  • Emboss formation step In order to facilitate winding of the obtained film, it is preferable to form embossed portions at both ends in the width direction of the film.
  • the method for forming the embossed part is not particularly limited, and examples thereof include a method for forming an embossed part by pressing a roller such as an embossing ring on the film, and a method for forming the embossed part in a non-contact manner.
  • Examples of the method of forming the embossed portion by a non-contact method include a method of forming an embossed portion by irradiating a film with a laser beam; a method of forming an embossed portion by applying a liquid material by an ink jet method, and the like. .
  • the winding step preferably includes a step (vibrating winding step) of winding the optical film around the core while periodically vibrating at least one of the optical film and the core in the width direction of the film.
  • FIG. 3 is a schematic view showing an example of a winding device 20 used in the winding process of the optical film.
  • FIG. 3A is a side view seen from the axial direction of the core 11 of the winding device 20, and
  • FIG. 3B is a plan view seen from above the optical film 13.
  • the winding device 20 presses the vibration control device 21 for controlling the vibration of the winding core 11, the guide roller 23 for guiding the optical film 13 to the winding core 11, and the optical film 13 wound on the winding core 11. Touch roller 25.
  • the winding core 11 is rotatably installed by a rotating device (not shown).
  • the vibration control device 21 is configured to apply vibration that changes the relative position between the optical film 13 and the core 11 and to control the vibration state.
  • the guide roller 23 is a member that rotates following the traveling of the optical film 13. Thereby, the traveling optical film 13 is guided to the core 11, the travel of the optical film 13 is reduced by the guide roller 23, and the optical film 13 can be smoothly supplied to the core 11. .
  • the touch roller 25 is a member that rotates following the rotation of the core 11. Accordingly, the optical film 13 wound around the core 11 can be pressed to prevent the wound optical film 13 from being separated from the core 11.
  • the optical film 13 is guided to the surface of the core 11 by the guide roller 23. Then, the core 11 is rotated by a rotating device (not shown), and the guided optical film 13 is wound around the core 11.
  • the winding process of winding the optical film 13 around the core 11 preferably includes a vibration winding process.
  • vibration is applied to change the relative positions of the optical film 13 and the core 11 in the width direction of the optical film 13.
  • the vibration condition can be controlled by the vibration control device 21.
  • FIG. 3B shows an example in which the core 11 is vibrated.
  • the optical film 13 and the core 11 may be vibrated so that the relative position in the width direction of the film changes. 13 may be vibrated; both the optical film 13 and the core 11 may be vibrated.
  • FIG. 4 is a graph for explaining the vibration in the vibration winding process.
  • the x-axis of the graph of FIG. 4 indicates the integrated thickness (mm) of the optical film being wound at the position of the optical film that is starting to be wound around the core. That is, the distance between the outermost surface of the wound optical film 13 and the surface of the core 11 is shown, and corresponds to the integrated thickness x of the optical film 13 in FIG.
  • the y-axis of the graph of FIG. 4 indicates the distance between the center position in the width direction of the optical film 13 and the center position in the width direction of the core 11 (the distance between the centers of the optical film 13 and the core 11) (mm). Corresponding to the center-to-center distance y in FIG.
  • the vibration in the vibration winding process may be a sinusoidal vibration as shown by a curve 52 in FIG. 4; may be a square wave vibration as shown by a curve 53; Such vibration may be used.
  • the vibration as shown by the curve 51 is preferable in order to make the side surface of the roll body difficult to be damaged.
  • a function indicating a sinusoidal vibration with an amplitude A and a period T as indicated by a curve 52 is a (x); a function indicating a rectangular wave vibration with an amplitude A and a period T as indicated by a curve 53 b (x);
  • f (x) is a function showing the vibration of amplitude A and period T as shown by the curve 51
  • the area surrounded by the function f (x) and the x axis is the function a (x )
  • the vibration represented by the function f (x) that is smaller than the area surrounded by the function b (x) and the x-axis is preferable.
  • the function is represented by a straight line 54 on the x-axis in FIG.
  • FIG. 5 is a schematic diagram showing an example of a simulation result of the integrated emboss height in the width direction of the roll body of the optical film.
  • the x-axis in FIG. 5 indicates the position in the width direction of the roll body of the optical film; the y-axis indicates the integrated emboss height.
  • the graph is shown by a line 57; when the vibration is made so as to have a function a (x) (however, the amplitude A is equal to or less than the width of the embossed portion). Becomes a graph shown by a line 56; when it is vibrated so as to be a function f (x), it becomes a graph shown by a line 55.
  • the embossed portion When vibration is not applied, the embossed portion is laminated at the same position in the width direction of the film as indicated by a line 57. Therefore, the accumulated embossed height is accumulated by the number of windings to the height of the embossed portion. Value.
  • the vibration when the vibration is applied so as to be the function a (x), as shown by the line 56, although the embossed portion overlaps near the center position of the amplitude A of the vibration, the vibration is not applied. Accumulated emboss height can be reduced. Further, when the vibration is applied so as to become the function f (x), the stay time when the absolute value of the y displacement of the vibration is large becomes relatively long.
  • the embossing on the roll body The overlapping of the parts can be effectively reduced.
  • the roll body of the optical film wound up through the vibration winding process is stored for a long period of time, the occurrence of deformation can be sufficiently suppressed.
  • the function f (x) may be a function in which the vibration period T and the amplitude A periodically change.
  • the function may be a function that gradually decreases as x increases; the function f (x) may be such that the vibration amplitude A increases gradually as the integrated thickness x of the optical film increases. It may be a function.
  • the amplitude A of vibration As the integrated thickness of the optical film 13 increases.
  • the amplitude of vibration is large, it is considered that the overlapping of the embossed portions can be further suppressed and the occurrence of deformation can be further suppressed.
  • the integrated thickness of the optical film is small and deformation of the roll body is difficult to occur, deformation of the roll body can be sufficiently suppressed even when vibration having a small amplitude is applied.
  • the integrated thickness of the wound optical film increases as the optical film is wound on the core, the roll body is likely to be deformed.
  • the vibration period T it is preferable to gradually reduce the vibration period T as the integrated thickness of the optical film increases. If the period of vibration is small, it is considered that the load on the optical film can be reduced. And as an optical film is wound up, if the integrated thickness of the wound up optical film increases, the roll body is likely to be deformed. Thus, when the integrated thickness of the wound optical film is large and deformation of the roll body is likely to occur, the load on the optical film can be effectively reduced by applying vibration with a small period, and the roll It is considered that the occurrence of body deformation can be further suppressed.
  • the vibration amplitude A is preferably 0.1 to 1.0% of the film width, and more preferably 0.35 to 0.70%. Specifically, it can be about 2 to 15 mm, preferably about 4 to 10 mm.
  • the amplitude A is greater than or equal to a certain value, it is easy to reduce the overlap between the embosses and to easily suppress the deformation of the roll body.
  • the amplitude A is less than a certain value, the side surfaces of both ends in the axial direction of the roll body do not wavy greatly, and the moving distance of the film per unit time does not increase excessively, so that an excessive increase in haze can be suppressed.
  • the period T of vibration is preferably 0.2 to 10% of the film width, and more preferably 0.3 to 6%. Specifically, it can be about 3 to 120 mm.
  • the period T is equal to or greater than a certain value, the side surfaces at both ends in the axial direction of the roll body do not wavy greatly, and the moving distance of the film per unit time does not increase excessively, so that an excessive increase in haze can be suppressed.
  • the period T is equal to or less than a certain value, it is easy to satisfactorily suppress the deformation of the roll body.
  • the winding process only needs to include the above-described vibration winding process, and all of the winding processes may be the vibration winding process; and may further include another winding process.
  • Examples of other winding processes include a process of winding without changing the center distance y (non-vibrating winding process).
  • the non-vibrating winding process and the vibrating winding process can be arbitrarily combined.
  • the start of winding is a non-vibration winding process
  • the middle is a vibration winding process
  • the end of winding is a non-vibration winding process. That is, at the beginning of winding, the integrated thickness of the optical film is small, and the roll body is hardly deformed, so that the non-vibrating winding process can be performed.
  • the wound roll body is likely to be deformed. In such a case, the roll shape deterioration can be effectively reduced by performing the vibration winding process.
  • the optical film can be smoothly fed out when the optical film is fed out from the roll body.
  • the end of winding is the vibration winding process
  • the optical film starts to be unwound from the obtained roll body, it may not be smoothly unwound due to meandering of the optical film.
  • the optical film can be smoothly fed out immediately after the optical film starts to be unwound from the roll body.
  • the roll body of the optical film of the present invention is a step of winding the optical film around the core while periodically vibrating at least one of the optical film and the core in the width direction of the film (vibration winding step). It is obtained through Thereby, it is possible to reduce the overlap of the embossed portion than the roll body obtained only by the non-vibration winding process of winding without vibrating, and the winding diameter of the width direction both ends and the width direction center portion of the roll body The difference can be reduced. As a result, the optical film of the present invention can suppress the deformation of the roll body even though the film thickness is very thin. By suppressing the deformation of the roll body, it is possible to suppress the deterioration of the optical characteristics due to the non-uniform tension applied to the optical film or the film thickness becoming non-uniform.
  • the optical film contains an aliphatic polyester compound
  • the strength of the optical film is likely to decrease, and the roll body is likely to be deformed. Even in such a case, the deformation of the roll body can be preferably suppressed by performing the above-described vibration winding process.
  • the optical films particularly, the embossed part and the optical film surface not provided with the embossed part tend to rub against each other, whereby the optical film surface not provided with the embossed part is easily damaged.
  • the optical film of this invention contains the compound represented by General formula (1), it can have favorable slipperiness. Thereby, even if the embossed portion and the optical film surface not provided with the embossed portion rub against each other, the optical film surface not provided with the embossed portion is hardly damaged and the increase in haze (external haze) is suppressed. Can do. As a result, the yield of the optical film or polarizing plate can be increased.
  • Polarizing plate The polarizing plate of the present invention includes a polarizer and two protective films sandwiching the polarizer.
  • a polarizer is an element that passes only light having a plane of polarization in a certain direction
  • a typical polarizer known at present is a polyvinyl alcohol polarizing film.
  • the polyvinyl alcohol polarizing film includes those obtained by dyeing iodine on a polyvinyl alcohol film and those obtained by dyeing a dichroic dye.
  • the polyvinyl alcohol polarizing film may be a film (preferably a film further subjected to durability treatment with a boron compound) dyed with iodine or a dichroic dye after uniaxially stretching the polyvinyl alcohol film; A film obtained by dying an alcohol film with iodine or a dichroic dye and then uniaxially stretching (preferably a film further subjected to a durability treatment with a boron compound) may be used.
  • the thickness of the polarizer is preferably 2 to 30 ⁇ m, and more preferably 5 to 15 ⁇ m in order to reduce the thickness of the polarizing plate.
  • At least one of the two protective films sandwiching the polarizer is preferably an optical film obtained from the roll body of the optical film of the present invention.
  • the other of the two protective films may be another protective film.
  • Examples of other protective films include (meth) acrylic resin films, polyester films, cellulose ester films, and the like, preferably cellulose ester films.
  • the cellulose ester contained in the cellulose ester film is defined in the same manner as the cellulose ester contained in the optical film described above, and may preferably be cellulose triacetate.
  • the in-plane retardation R 0 measured under the conditions of a measurement wavelength of 590 nm and 23 ° C. and 55% RH is preferably 0 to 20 nm, and more preferably 0 to 10 nm.
  • the retardation Rt in the thickness direction measured under the conditions of a measurement wavelength of 590 nm and 23 ° C. and 55% RH of the protective film is preferably from 0 to 80 nm, and more preferably from 0 to 50 nm.
  • the thickness of the other protective film can be about 10 to 100 ⁇ m, preferably 10 to 80 ⁇ m.
  • the polarizing plate of the present invention can be obtained, for example, through a process of bonding the optical film of the present invention to at least one surface of a polarizer with an adhesive.
  • the adhesive used for the bonding may be a completely saponified polyvinyl alcohol aqueous solution (water glue) or an active energy ray-curable adhesive. It is preferable to use an active energy ray-curable adhesive because the resulting adhesive layer has a high elastic modulus and can easily suppress dimensional changes of the polarizing plate.
  • the active energy ray-curable adhesive composition is a photo radical polymerization composition using photo radical polymerization, a photo cation polymerization composition using photo cation polymerization, or a hybrid type using both photo radical polymerization and photo cation polymerization. It can be a composition or the like.
  • a radical photopolymerizable composition is a composition comprising a radically polymerizable compound containing a polar group such as a hydroxy group or a carboxy group and a radically polymerizable compound not containing a polar group described in JP-A-2008-009329 in a specific ratio. It can be a thing.
  • the radical polymerizable compound is preferably a compound having an ethylenically unsaturated bond capable of radical polymerization.
  • Preferable examples of the compound having an ethylenically unsaturated bond capable of radical polymerization include a compound having a (meth) acryloyl group.
  • Examples of the compound having a (meth) acryloyl group include an N-substituted (meth) acrylamide compound and a (meth) acrylate compound.
  • (Meth) acrylamide means acrylamide or methacrylamide.
  • the cationic photopolymerization type composition comprises ( ⁇ ) a cationic polymerizable compound, ( ⁇ ) a cationic photopolymerization initiator, and ( ⁇ ) light having a wavelength longer than 380 nm, as disclosed in Japanese Patent Application Laid-Open No. 2011-028234. It may be a composition containing each component of a photosensitizer exhibiting maximum absorption and ( ⁇ ) naphthalene photosensitizer.
  • Such a polarizing plate is, for example, a step of subjecting the surface of the optical film to easy adhesion (corona treatment, plasma treatment, etc.); a step of applying an active energy ray-curable adhesive to at least one of the polarizer and the optical film; It can be manufactured through a step of bonding the polarizer and the optical film through the obtained adhesive layer; a step of curing the adhesive layer in a state where the polarizer and the optical film are bonded.
  • the liquid crystal display device of the present invention includes a first polarizing plate, a liquid crystal cell, a second polarizing plate, and a backlight in this order. At least one of the first and second polarizing plates may be the polarizing plate of the present invention.
  • the polarizing plate of the present invention is preferably arranged so that the optical film of the present invention is on the liquid crystal cell side.
  • the first polarizing plate includes a first polarizer, a protective film F1 disposed on a surface opposite to the liquid crystal cell of the first polarizer, and a liquid crystal cell of the first polarizer. And a protective film F2 disposed on the side surface.
  • the second polarizing plate is disposed on the surface opposite to the liquid crystal cell of the second polarizer, the protective film F3 disposed on the liquid crystal cell side of the second polarizer, and the second polarizer.
  • At least one of the protective films F1, F2, F3 and F4; preferably at least one of F2 and F3 is an optical film obtained from the roll body of the optical film of the present invention.
  • the liquid crystal display device of the present invention may be a medium or large-sized liquid crystal display device such as a television or a notebook computer; it may be a small liquid crystal display device such as a smartphone. Especially, since the effect of the present invention is easily obtained, the liquid crystal display device is a small-sized liquid crystal display device having a display area (not shown) having a diagonal length of 10 inches or less, preferably 5 inches or less. Is preferred.
  • FIG. 6 is a schematic diagram showing an example of a small liquid crystal display device.
  • the small liquid crystal display device 100 includes a liquid crystal cell 110, a first polarizing plate 130 and a second polarizing plate 150 sandwiching the liquid crystal cell 110, and a backlight 170; Cover glass 190 disposed on the viewing side surface of plate 130, touch panel unit 210 disposed between first polarizing plate 130 and liquid crystal cell 110, and rechargeable battery disposed on the back side of backlight 170 230.
  • the display mode of the liquid crystal cell 110 may be various display modes such as STN, TN, OCB, HAN, VA (MVA, PVA), IPS, FFS (Fringe Field Switching), and has a wide viewing angle.
  • the IPS mode or the FFS mode is preferable.
  • the first polarizing plate 130 is disposed on the viewing side surface of the liquid crystal cell 110; the first polarizer 131 and the protective film disposed on the surface of the first polarizer 131 opposite to the liquid crystal cell 110.
  • 133 (F1) and a protective film 135 (F2) disposed on the surface of the first polarizer 131 on the liquid crystal cell 110 side.
  • the second polarizing plate 150 is disposed on the surface of the liquid crystal cell 110 on the backlight side; the second polarizer 151 and the protective film disposed on the surface of the second polarizer 151 on the liquid crystal cell 110 side.
  • 153 (F3) and a protective film 155 (F4) disposed on the surface of the second polarizer 151 opposite to the liquid crystal cell 110.
  • both of the protective films 135 (F2) and 153 (F3) can include an optical film obtained from the roll body of the present invention.
  • the touch panel unit 210 is disposed between the liquid crystal cell 110 and the first polarizing plate 130 (on-cell type).
  • the arrangement of the touch panel unit 210 is not limited to the mode shown in FIG. 6, and the touch panel unit 210 may be provided integrally with the cover glass 190 (cover glass integrated type); (In-cell type).
  • the rechargeable battery 230 may be, for example, a lithium ion secondary battery.
  • both of the protective films 135 (F2) and 153 (F3) can include an optical film obtained from the roll body of the present invention.
  • the deformation of the roll body is suppressed even though the film thickness of the optical film is very thin. Therefore, by applying non-uniform tension to the optical film due to the deformation of the roll body, it is possible to suppress a decrease in display performance due to non-uniform retardation or non-uniform film thickness on the optical film. .
  • a liquid crystal display device tends to become hot due to the heat of the backlight.
  • a small liquid crystal display device as shown in FIG. 6 includes a rechargeable battery 230 that generates heat during charging and discharging, and the device volume is small.
  • the thermal durability of a film can be improved because the compound represented by General formula (1) further contains a sulfur atom.
  • the protective films 135 (F2) and 153 (F3) have good durability and can maintain good display performance.
  • the compound represented by the general formula (1) contains a sulfur atom when used in a high temperature environment, thereby improving the durability of the film. It is preferable from a viewpoint which can be obtained.
  • Example 1 Production of Optical Film ⁇ Example 1> (Preparation of fine particle additive solution) 11 parts by mass of fine particles (Aerosil R972V manufactured by Nippon Aerosil Co., Ltd.) and 89 parts by mass of ethanol were stirred and mixed with a dissolver for 50 minutes, and then dispersed with Manton Gorin to obtain a fine particle dispersion. Next, 99 parts by mass of methylene chloride was charged into the dissolution tank, and 5 parts by mass of the prepared fine particle dispersion was slowly added while stirring sufficiently. The obtained solution was dispersed with an attritor so that the secondary particles had a predetermined particle size, and then filtered with Finemet NF manufactured by Nippon Seisen Co., Ltd. to obtain a fine particle additive solution. It was.
  • Finemet NF manufactured by Nippon Seisen Co., Ltd.
  • a dope liquid having the composition shown below was prepared. First, the following components were put into a sealed container, heated to 70 ° C., and the cellulose ester was completely dissolved while stirring. The obtained solution was used as Azumi filter paper No. manufactured by Azumi Filter Paper Co., Ltd. Filtration using 244 gave a dope solution.
  • the obtained dope solution was uniformly cast on a stainless band support having a dope temperature of 35 ° C. and a temperature of 22 ° C. using a belt casting apparatus. Then, after drying the dope liquid on a support body to the range which can be peeled, it peeled from the stainless steel band support body, and obtained the film-form thing.
  • the residual solvent amount of the dope at the time of peeling was 25%.
  • the obtained film-like material was dried at 120 ° C. while being stretched in the width direction (TD direction) at a stretch ratio of 1.01 with a tenter.
  • the width is released and dried at 120 ° C. while being conveyed by a number of rolls, and then subjected to a knurling process with a width of 10 mm and a height of 5 ⁇ m at both ends of the film to produce a film with a width of 1400 mm and a thickness of 20 ⁇ m. did.
  • the obtained knurled film was wound into a roll using a winding device as shown in FIG. 3 while vibrating the core in the film width direction to obtain a roll body.
  • the roll 101 was obtained by winding the film 101 at 2900 m with a speed of 80 m / min, a winding initial tension of 140 N, a winding end tension of 90 N, and a nip force of a touch roller of 20 N.
  • the shape of the side surface of both end portions in the axial direction of the obtained roll body was wavy.
  • the curve 62 of FIG. 7 shows the sine wave vibration whose period T and A are the same as the above.
  • Example 1 A roll body 103 of the film was obtained in the same manner as in Example 1 except that the produced film was wound (straight) without vibrating the core.
  • Example 2 A film was produced in the same manner as in Example 1 except that the compound represented by the general formula (1) was not added. And the roll body 104 of the film was obtained like Example 1 except having wound up the obtained film by the straight winding which does not vibrate a core.
  • Examples 3 to 6 Comparative Example 5> A film was produced in the same manner as in Example 1 except that the film thickness of the obtained film was changed as shown in Table 4, and rolls 107 to 111 were obtained.
  • Example 7 A roll was produced in the same manner as in Example 1 except that the content of the polyester compound K1 was changed to 5 parts by mass.
  • Examples 8 to 12 Comparative Example 6> Rolls 113 to 118 were obtained in the same manner as in Example 4 except that the content of the compound represented by the general formula (1) was changed as shown in Table 4.
  • the shape of the obtained roll body, the haze of the film, the phase difference and the thermal durability were evaluated by the following methods.
  • Roll body shape The surface shape of the obtained roll body was visually observed and evaluated according to the following criteria. ⁇ : No wrinkles are observed on the roll surface. ⁇ : Weak wrinkles are observed on a part of the roll surface. ⁇ : Wrinkles or dents are observed on the entire roll surface. Yes, wrinkles and dents are observed on the entire surface. XX: The roll surface has significant shape deterioration, wrinkles and dents are recognized on the entire surface, and the shape has deteriorated to the inside of the roll. It was judged that there was no problem.
  • Haze value is 0.3% or less ⁇ : Haze value is more than 0.3% and less than 0.4% ⁇ : Haze value is more than 0.4% and 0.5% or less ⁇ : Haze value is more than 0.5% ⁇ or more was judged to be a practically no problem level.
  • nx, ny, and nz were calculated by KOBRA21ADH from the measured R 0 and R ( ⁇ ) and the above-described average refractive index and film thickness, and Rth at a measurement wavelength of 590 nm was calculated. The retardation was measured under the conditions of 23 ° C. and 55% RH.
  • a film was drawn out from the obtained roll body, cut out at 10 points and a size of 4 cm ⁇ 4 cm at equal intervals in the width direction, and the obtained film was stored in a thermostat at 50 ° C. for 2000 hours.
  • the film after storage was conditioned at 23 ° C. and 55% RH, and then the haze was measured in the same manner as described above, and the average value of these 10 points was determined.
  • save were applied to the following formula, and the change rate of haze was computed.
  • Haze change ratio (Haze after storage ⁇ Haze before storage) / (Haze before storage) ⁇ 100 (%) ⁇ : Haze change rate is less than 3% ⁇ : Haze change rate is 3% or more and less than 5% ⁇ : Haze change rate is 5% or more and less than 15% ⁇ : Haze change rate is 15% or more
  • a polarizing plate was produced by the following method using the film obtained from the produced roll body, and the yield of the polarizing plate was evaluated.
  • ultraviolet light gallium-filled metal halide lamp
  • an ultraviolet irradiation device with a belt conveyor
  • Light HAMMER10 bulb V bulb
  • peak illuminance 1600 mW / cm 2
  • the active energy ray-curable adhesive layer was cured by irradiating with ultraviolet rays so that the integrated irradiation amount was 1000 / mJ / cm 2 (wavelength 380 to 440 nm) to obtain a polarizing plate.
  • the yield of the obtained polarizing plate was evaluated by the following method.
  • the surface of the polarizing plate was visually observed, and the transparency due to the flatness failure and haze was evaluated.
  • the permeability due to the haze of the polarizing plate was confirmed by sensory evaluation for the presence or absence of fine scratches when the polarizing plate was placed on a white lamp. And the thing which does not have any problem in the transparency resulting from the flatness failure and the haze was defined as a non-defective product.
  • the ratio of non-defective products and defective products when 50 polarizing plates were produced was calculated.
  • Non-defective polarizing plate is 95% or more ⁇ : Non-defective polarizing plate is 80% or more and less than 95% ⁇ : Non-defective polarizing plate is 60% or more and less than 80% ⁇ : Non-defective polarizing plate is less than 60%
  • the roll body of Comparative Example 1 the roll body was deformed and the roll shape was poor. This is considered to be caused by wrinkles generated on the entire roll body because the roll diameter was increased at both ends in the width direction of the roll body because it was wound by the non-vibration winding method (straight winding).
  • the roll bodies of Comparative Examples 3 and 4 were able to suppress deformation of the roll body, but the haze increased. This is presumably because the film slipping property is low, the films rub against each other, and the film surface is finely scratched. Since the film of Comparative Example 5 is very thin, it is considered that the deformation of the roll body could not be sufficiently suppressed.
  • the film of Comparative Example 6 could not suppress the deformation of the roll body. This is presumably because the content of the compound represented by the general formula (1) is too large, so that the film becomes excessively slippery and winding deviation occurs. In addition, an increase in haze due to the crying out (precipitation) of the additive due to the large amount of additive added was observed.
  • the film obtained from the roll body of the comparative example 2 containing an aliphatic polyester compound from the contrast of the comparative example 2 and the comparative example 7 is from the film obtained from the roll body of the comparative example 7 which does not contain an aliphatic polyester compound. It is also shown that the roll body is significantly deformed when straight winding is performed. From this, it is suggested by applying this invention that even if it is a film containing an aliphatic polyester compound, the deformation
  • the present invention it is possible to provide a roll body of an optical film in which deformation of the roll body is suppressed and an increase in haze is suppressed.

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

Abstract

La présente invention vise à fournir un corps de rouleau de film optique pour lequel la déformation du corps de rouleau est atténuée et une augmentation du trouble est atténuée. Ce corps de rouleau de film optique est obtenu par l'enroulement d'un film optique dans le sens de sa longueur, le film optique ayant 15 à 45 µm d'épaisseur et présentant des parties en relief sur ses deux extrémités dans le sens de la largeur. Le film optique contient un ester de cellulose et un composé représentant de 0,05 à 5 % en masse, exprimé par la formule générale (1). Les surfaces latérales du corps de rouleau aux deux extrémités, dans la direction axiale, ont une forme d'onde.
PCT/JP2015/057078 2014-03-11 2015-03-11 Corps de rouleau de film optique et son procédé de fabrication, plaque polarisante, et dispositif d'affichage à cristaux liquides Ceased WO2015137367A1 (fr)

Priority Applications (3)

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JP2016507771A JPWO2015137367A1 (ja) 2014-03-11 2015-03-11 光学フィルムのロール体とその製造方法、偏光板および液晶表示装置
KR1020167024448A KR20160119159A (ko) 2014-03-11 2015-03-11 광학 필름의 롤체와 그 제조 방법, 편광판 및 액정 표시 장치
CN201580013103.4A CN106068299A (zh) 2014-03-11 2015-03-11 光学膜的卷体及其制造方法、偏振片和液晶显示装置

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JP2014-047539 2014-03-11

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JP2017122857A (ja) * 2016-01-08 2017-07-13 コニカミノルタ株式会社 光学フィルム、光学フィルムの製造方法、ロールフィルム、偏光板及び画像表示装置
JP2018016453A (ja) * 2016-07-28 2018-02-01 株式会社クラレ フィルムロールの製造方法
WO2018216590A1 (fr) * 2017-05-23 2018-11-29 日本ゼオン株式会社 Rouleau de film et son procédé de fabrication

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CN109230728A (zh) * 2018-09-27 2019-01-18 明尼苏达矿业制造特殊材料（上海）有限公司 防跑偏装置

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WO2011001700A1 (fr) * 2009-06-30 2011-01-06 コニカミノルタオプト株式会社 Film d'ester de cellulose, plaque polarisante l'utilisant et dispositif d'affichage à cristaux liquides
JP2012128430A (ja) * 2004-08-09 2012-07-05 Fujifilm Corp 高分子フィルム、それを用いた光学補償フィルム、偏光板、および液晶表示装置
WO2014188993A1 (fr) * 2013-05-24 2014-11-27 コニカミノルタ株式会社 Procédé de production d'un film optique

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JP2012128430A (ja) * 2004-08-09 2012-07-05 Fujifilm Corp 高分子フィルム、それを用いた光学補償フィルム、偏光板、および液晶表示装置
JP2010150041A (ja) * 2008-11-19 2010-07-08 Fujifilm Corp フィルムの巻取方法及び装置、並びにフィルムロールの製造方法
WO2011001700A1 (fr) * 2009-06-30 2011-01-06 コニカミノルタオプト株式会社 Film d'ester de cellulose, plaque polarisante l'utilisant et dispositif d'affichage à cristaux liquides
WO2014188993A1 (fr) * 2013-05-24 2014-11-27 コニカミノルタ株式会社 Procédé de production d'un film optique

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JP2017122857A (ja) * 2016-01-08 2017-07-13 コニカミノルタ株式会社 光学フィルム、光学フィルムの製造方法、ロールフィルム、偏光板及び画像表示装置
JP2018016453A (ja) * 2016-07-28 2018-02-01 株式会社クラレ フィルムロールの製造方法
WO2018216590A1 (fr) * 2017-05-23 2018-11-29 日本ゼオン株式会社 Rouleau de film et son procédé de fabrication
KR20200011418A (ko) * 2017-05-23 2020-02-03 니폰 제온 가부시키가이샤 필름 롤 및 그 제조 방법
JPWO2018216590A1 (ja) * 2017-05-23 2020-03-26 日本ゼオン株式会社 フィルムロール及びその製造方法
JP7020483B2 (ja) 2017-05-23 2022-02-16 日本ゼオン株式会社 フィルムロール及びその製造方法
KR102366213B1 (ko) 2017-05-23 2022-02-21 니폰 제온 가부시키가이샤 필름 롤 및 그 제조 방법

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