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WO2016035404A1 - 光学フィルム、偏光板および画像表示装置 - Google Patents

光学フィルム、偏光板および画像表示装置 Download PDF

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Publication number
WO2016035404A1
WO2016035404A1 PCT/JP2015/066393 JP2015066393W WO2016035404A1 WO 2016035404 A1 WO2016035404 A1 WO 2016035404A1 JP 2015066393 W JP2015066393 W JP 2015066393W WO 2016035404 A1 WO2016035404 A1 WO 2016035404A1
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Prior art keywords
film
optical film
acid
resin
organic compound
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PCT/JP2015/066393
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English (en)
French (fr)
Japanese (ja)
Inventor
知世 安達
岡野　賢
絢子 稲垣
佐々木　謙一
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Konica Minolta Inc
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Konica Minolta Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/46—Polymerisation initiated by wave energy or particle radiation
    • C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
    • C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
    • 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
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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

Definitions

  • the present invention relates to an optical film having a cured layer on at least one surface of a substrate, a polarizing plate having the optical film, and an image display device having the polarizing plate.
  • an optical film such as a polarizing plate protective film is disposed on the surface of a polarizing plate used in an image display device such as a liquid crystal display device (LCD).
  • the polarizing plate protective film is formed by forming a cured layer on a base material made of, for example, a cellulose ester film.
  • the cured layer is formed by applying a hard coat material on a substrate and curing it by irradiation with active energy rays.
  • Patent Documents 1 and 2 attempt to improve the durability of the film by forming a cured layer of the optical film with a resin having a specific structure and reducing moisture permeability.
  • JP 2006-83225 A see claim 1, paragraphs [0005], [0007], [0013], etc.
  • JP 2014-95890 A see claim 1, paragraphs [0006], [0007], [0031], etc.
  • Patent Documents 1 and 2 are demanded in recent years under severer conditions of higher temperature and humidity (for example, in an environment at 80 ° C. and 85% relative humidity (hereinafter referred to as RH)). Then, it does not have low moisture permeability sufficiently, the protection performance of the polarizer is insufficient, and further improvement of the optical film has been demanded.
  • RH relative humidity
  • an optical film that can reduce moisture permeability in a higher temperature and high humidity environment, and can suppress unevenness in application of the cured layer and suppress deterioration in visibility in an image display device.
  • the present invention has been made in order to solve the above-described problems, and the object thereof is to sufficiently have low moisture permeability even under a severe environment of higher temperature and higher humidity, and to prevent coating unevenness of the cured layer.
  • An object of the present invention is to provide an optical film that can suppress visibility deterioration in an image display device, a polarizing plate having the optical film, and an image display device having the polarizing plate.
  • the inventors of the present application have found that the above problem can be solved by forming a cured layer having the following constitution on at least one surface of the base material, and have reached the present invention. That is, the above object of the present invention is achieved by the following configuration.
  • An optical film according to one aspect of the present invention is an optical film having a cured layer on at least one surface of a substrate,
  • the cured layer is An active energy ray-curable resin having an alicyclic structure;
  • the SP value which is a solubility parameter, is in the range of 17.0 to 21.0 [(J / cm 3 ) 1/2 ], has an aromatic ring structure, or has a polar substituent in the alicyclic structure.
  • a kind of cyclic organic compound, The cyclic organic compound is a polymer of an ethylenically unsaturated monomer.
  • an optical film having sufficiently low moisture permeability can be realized even in a severe environment of higher temperature and humidity. Moreover, since the coating unevenness of the cured layer can be suppressed in the optical film, visibility deterioration in the image display device can be suppressed when the optical film is applied to the polarizing plate of the image display device.
  • FIG. 1 is a cross-sectional view illustrating a schematic configuration of an image display device according to an embodiment of the present invention. It is sectional drawing which shows the structure of the optical film applied to the polarizing plate of the said image display apparatus.
  • the films of Patent Documents 1 and 2 do not have low moisture permeability sufficiently under severe durability conditions (for example, 80 ° C. and 85% RH) that are required in recent years.
  • severe durability conditions for example, 80 ° C. and 85% RH
  • an optical film having the following configuration was examined. That is, it is an optical film having a cured layer obtained by adding a low molecular weight cyclic organic compound to an active energy ray-curable resin having an alicyclic structure on a substrate.
  • the cyclic organic compound has an aromatic ring structure or a polar substituent in the alicyclic structure.
  • the present inventors have reduced the optical film by adding a polymer cyclic organic compound having a specific structure to an active energy ray-curable resin having an alicyclic structure. It was found that the visibility deterioration of the image display device can be suppressed while achieving moisture permeation.
  • the high molecular cyclic organic compound having the above specific structure has an SP value as a solubility parameter in the range of 17.0 to 21.0 [(J / cm 3 ) 1/2 ], and an aromatic ring. It is a polymer of an ethylenically unsaturated monomer having a structure or having a polar substituent in an alicyclic structure. The reason why visibility deterioration can be suppressed by adding the cyclic organic compound to the resin is considered as follows.
  • the deterioration of visibility in the image display device is considered to be caused by the occurrence of minute coating unevenness due to uneven distribution of the low molecular weight compound in the coating layer (cured layer) caused by charging of the base material of the optical film. It is done. That is, when the compound added to the coating layer has a low molecular weight, the compound easily moves in the coating layer due to charging of the base material, resulting in uneven distribution of the compound, which causes coating unevenness. By adding a polymer compound (polymer of ethylenically unsaturated monomer) to the coating layer, the compound is difficult to move through the coating layer even if the substrate is charged because the compound is a polymer.
  • a polymer compound polymer of ethylenically unsaturated monomer
  • compatibility of curable resin and the said compound increases because SP value of a high molecular compound exists in said range. Furthermore, since the aromatic ring structure has a high polarity and the structure having a polar substituent in the alicyclic structure also has a high polarity, the compatibility of both is further increased by adding the above compound to the curable resin. For this reason, it is considered that the uneven distribution of the compound in the coating layer is further suppressed, thereby further suppressing the occurrence of uneven coating and further suppressing the deterioration of the visibility of the image display device.
  • a preferable range of the SP value of the polymer compound is 18.0 to 20.0 [(J / cm 3 ) 1/2 ].
  • the aromatic ring structure is more preferable than the structure having a polar substituent in the alicyclic structure in that the compatibility with the curable resin is further improved and coating unevenness can be effectively suppressed.
  • the cellulose ester film has high hygroscopicity and easily allows moisture to pass through in a high temperature and high humidity environment, so that the polarizing performance of the polarizer is likely to deteriorate due to the influence of the moisture. Therefore, the configuration of the present embodiment in which the effect of low moisture permeability is obtained in a higher temperature and high humidity environment is very effective when the substrate is a cellulose ester film.
  • FIG. 1 is a cross-sectional view illustrating a schematic configuration of an image display device 1 according to the present embodiment.
  • the image display device 1 is, for example, a liquid crystal display device, and is configured by bonding a protective portion 3 to a polarizing plate 5 (particularly on an optical film 15 described later) of the liquid crystal display panel 2 via a filling layer 31.
  • the filling layer 31 is an adhesive layer (void filler) made of a photocurable resin such as acrylic, and is formed on the entire surface of the polarizing plate 5 of the liquid crystal display panel 2.
  • the protection unit 3 protects the surface of the liquid crystal display panel 2 and is formed of a front plate made of acrylic resin or glass, for example. Note that a touch panel (such as a capacitance method or a resistance film method) may be used as the protection unit 3 instead of the front plate.
  • the liquid crystal display panel 2 is configured by disposing polarizing plates 5 and 6 on both sides of a liquid crystal cell 4 (display cell) in which a liquid crystal layer is sandwiched between a pair of substrates.
  • the polarizing plate 5 is attached to one surface side (for example, the viewing side) of the liquid crystal cell 4 via the adhesive layer 7.
  • the polarizing plate 6 is attached to the other surface side (for example, the backlight 9 side) of the liquid crystal cell 4 through the adhesive layer 8.
  • the driving method of the liquid crystal display panel 2 is not particularly limited, and various driving methods such as an IPS (In Plane Switching) type and a TN (Twisted Nematic) method can be employed.
  • the polarizing plate 5 includes a polarizer 11 that transmits predetermined linearly polarized light, a film substrate 12 and a cured layer 13 that are sequentially stacked on the protective portion 3 side of the polarizer 11, and a liquid crystal cell 4 side of the polarizer 11.
  • the optical film 14 is made up of.
  • the film base 12 and the cured layer 13 constitute an optical film 15 as a protective film formed on the surface on the viewing side of the polarizer 11.
  • the film substrate 12 is composed of a cellulose ester film. Therefore, the film substrate 12 is also referred to as a cellulose ester film substrate.
  • the film thickness of the film substrate 12 is in the range of 5 to 34 ⁇ m.
  • the optical film 15 and the polarizing plate 5 can be made thinner, which can contribute to the thinning of the entire image display device 1.
  • the cured layer 13 may be composed of a single layer as shown in FIG. 1, but two or more layers may be laminated on the film substrate 12.
  • the cured layer 13 may be configured by laminating a first cured layer 13a and a second cured layer 13b from the film base 12 side.
  • the optical film 14 is provided to protect the back surface of the polarizing plate 5.
  • the optical film 14 may be made of the same material as the film substrate 12 (for example, cellulose ester) or may be made of other materials.
  • the film substrate 12 may be composed of a ⁇ / 4 film.
  • the ⁇ / 4 film is a layer that imparts in-plane retardation of about 1 ⁇ 4 of the wavelength to transmitted light, and in the present embodiment, the ⁇ / 4 film is composed of a film that is obliquely stretched.
  • the angle (crossing angle) formed between the slow axis of the ⁇ / 4 film and the absorption axis of the polarizer 11 is 30 ° to 60 °, whereby the linearly polarized light from the polarizer 11 is converted into the ⁇ / 4 film ( It is converted into circularly polarized light or elliptically polarized light by the film substrate 12).
  • the polarizing plate can be used regardless of how the transmission axis of the polarizer 11 (perpendicular to the absorption axis) and the transmission axis of the polarized sunglasses are misaligned.
  • the light component parallel to the transmission axis of the polarized sunglasses contained in the light emitted from 5 (circularly polarized light or elliptically polarized light) can be guided to the eyes of the observer. Thereby, it can suppress that it becomes difficult to see a display image with the angle to observe.
  • the polarizing plate 6 includes a polarizer 21 that transmits predetermined linearly polarized light, an optical film 22 that is disposed on the liquid crystal cell 4 side of the polarizer 21, and an optical that is disposed on the opposite side of the polarizer 21 from the liquid crystal cell 4.
  • the film 23 is laminated.
  • the polarizer 21 is disposed so that the transmission axis is perpendicular to the polarizer 11 (crossed Nicol state).
  • the optical films 22 and 23 are provided to protect the front and back surfaces of the polarizing plate 6, but they may be made of the same material (for example, cellulose ester) as the film substrate 12 of the polarizing plate 5. However, it may be composed of other materials.
  • the above-described optical film 15 can be used for purposes other than the polarizing plate.
  • the cured layer 13 may be provided on both surfaces of the film substrate 12. Therefore, in the optical film 15, it can be said that the cured layer 13 may be formed on at least one surface of the film substrate 12.
  • the cured layer of this embodiment contains an active energy ray-curable resin having an alicyclic structure (hereinafter also simply referred to as a curable resin).
  • alicyclic structure include norbornyl, tricyclodecanyl, tetracyclododecanyl, pentacyclopentadecanyl, adamantyl, diamantanyl and the like.
  • the active energy ray curable resin preferably has an ethylenically unsaturated double bond.
  • the ethylenically unsaturated double bond group include polymerizable functional groups such as (meth) acryloyl group, vinyl group, styryl group and allyl group. Among them, (meth) acryloyl group and —C (O) OCH ⁇ CH 2 is preferred.
  • the active energy ray-curable resin having an alicyclic structure is preferably composed of a hydrocarbon group having an alicyclic structure and a group having an ethylenically unsaturated double bond bonded via a linking group.
  • the linking group include a single bond, an alkylene group, an amide group, a carbamoyl group, an ester group, an oxycarbonyl group, an ether group, or a group obtained by combining these.
  • polyols such as diols and triols having an alicyclic structure, carboxylic acids having (meth) acryloyl groups, vinyl groups, styryl groups, allyl groups, carboxylic acid derivatives, epoxy derivatives, isocyanate derivative compounds, etc.
  • polyols such as diols and triols having an alicyclic structure, carboxylic acids having (meth) acryloyl groups, vinyl groups, styryl groups, allyl groups, carboxylic acid derivatives, epoxy derivatives, isocyanate derivative compounds, etc.
  • R1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms
  • R2 is an alkylene group or alkylene oxide group having 1 to 5 carbon atoms
  • R3 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms
  • n is 1) Or an integer of 2.
  • R1 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, preferably a hydrogen atom, a methyl group, or an ethyl group.
  • R2 represents an alkylene group having 1 to 5 carbon atoms or an alkylene oxide group, and preferably represents a methylene group, an ethylene group, a methylene oxide group, or an ethylene oxide group.
  • R3 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and preferably represents a hydrogen atom, a methyl group, or an ethyl group.
  • Examples of commercially available compounds represented by the above general formulas (I) and (II) include NK ester A-DCP (tricyclodecane dimethanol diacrylate, manufactured by Shin-Nakamura Chemical Co., Ltd.). However, it is not limited to these.
  • L and L ′ each independently represent a divalent or higher valent linking group and are not divalent simultaneously.
  • n represents an integer of 1 to 3.
  • L and L ′ each independently represent a divalent or higher valent linking group and are not divalent simultaneously.
  • n represents an integer of 1 to 2.
  • L and L ′ each independently represent a divalent or higher valent linking group and are not divalent simultaneously.
  • n represents an integer of 1 to 2.
  • L, L ′, and L ′′ each independently represent a divalent or higher linking group.
  • L and L ′ each independently represent a divalent or higher linking group and are not divalent simultaneously.
  • the cured layer preferably contains 30% by mass or more of active energy ray-curable resin having an alicyclic structure, and more preferably 50% by mass or more.
  • the cured layer is excellent in mechanical film strength (abrasion resistance, pencil hardness), and in the range not impairing the effects of the present invention, the following ultraviolet curing is performed.
  • a functional resin may be contained.
  • the ultraviolet curable resin include an ultraviolet curable acrylate resin, an ultraviolet curable urethane acrylate resin, an ultraviolet curable polyester acrylate resin, an ultraviolet curable epoxy acrylate resin, an ultraviolet curable polyol acrylate resin, and an ultraviolet curable resin.
  • a curable epoxy resin or the like is preferably used, and an ultraviolet curable acrylate resin is particularly preferable.
  • polyfunctional acrylate is preferable.
  • the polyfunctional acrylate is preferably selected from the group consisting of pentaerythritol polyfunctional acrylate, dipentaerythritol polyfunctional acrylate, pentaerythritol polyfunctional methacrylate, and dipentaerythritol polyfunctional methacrylate.
  • the polyfunctional acrylate is a compound having two or more acryloyloxy groups or methacryloyloxy groups in the molecule.
  • the polyfunctional acrylate monomer include ethylene glycol diacrylate, diethylene glycol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, trimethylolethane triacrylate, and tetramethylolmethane triacrylate.
  • a monofunctional acrylate may also be used.
  • Monofunctional acrylates include isobornyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, isostearyl acrylate, benzyl acrylate, ethyl carbitol acrylate, phenoxyethyl acrylate, lauryl acrylate, isooctyl acrylate, tetrahydrofurfuryl acrylate, behenyl Examples thereof include acrylate, 4-hydroxybutyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and cyclohexyl acrylate. Such acrylates can be obtained from Nippon Kasei Kogyo Co., Ltd., Shin-Nakamura Chemical Co., Ltd., Osaka Organic Chemical Co., Ltd., etc.
  • the cured layer has an SP value in the range of 17.0 to 21.0 [(J / cm 3 ) 1/2 ], and has an aromatic ring structure or a polar substituent in the alicyclic structure, It has one kind of cyclic organic compound.
  • the SP value is represented by the square root of the sum of the molar cohesive energy of each atomic group divided by the volume, and indicates the polarity per unit volume.
  • This SP value is also called a solubility parameter (Solubility Parameter).
  • Solubility Parameter When the force acting between the solvent and the solute is assumed to be an intermolecular force (regular solution theory), it is used as a measure for expressing the intermolecular force. Is done. From experience, it is known that the smaller the difference between the SP values of the two components, the greater the solubility (the two components are likely to be mixed).
  • the SP value can be calculated by, for example, FUJITSU Technical Computing Solution SCIGRESS (manufactured by Fujitsu Limited).
  • the preferred range of the SP value of the cyclic organic compound is 18.0 to 20.0 [(J / cm 3 ). 1/2 ].
  • the aromatic ring structure of the cyclic organic compound may be a structure containing at least one monocyclic or polycyclic ring exhibiting aromaticity.
  • Examples thereof include a benzene-based aromatic ring having an aromatic ring in which one or a plurality of benzene rings are condensed or connected, a heteroaromatic ring having an element other than carbon in the ring structure, and the like.
  • a benzene aromatic ring is preferred, and the number of aromatic rings to which the benzene ring is condensed or linked is usually 1 to 5, preferably 1 to 3.
  • the alicyclic structure of the cyclic organic compound may be a structure containing at least one cycloalkane or cycloalkene.
  • a structure containing at least one cycloalkane or cycloalkene may be a structure containing at least one cycloalkane or cycloalkene.
  • Examples of the monocyclic cycloalkane include cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, cyclononane, cyclodecane, cycloundecane, and cyclododecane.
  • Examples of the monocyclic cycloalkene include cyclopropene, cyclobutene, cyclopropene, cyclohexene, cycloheptene, cyclooctene and the like.
  • the cycloaliphatic structure is preferably cyclohexane or cyclohexene.
  • the alicyclic structure is not limited to a single ring and may be polycyclic. Examples of the polycyclic structure include bicyclodecane, norbornene, norbornadiene and the like.
  • Examples of the polar substituent include, but are not limited to, a hydroxyl group, a carbonyl group, a carboxy group, an amino group, a nitro group, and a nitrile group. Preferably, they are a hydroxyl group and a carboxy group.
  • the cyclic organic compound is a polymer of an ethylenically unsaturated monomer.
  • ethylenically unsaturated monomers include (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, (meth) acrylic acid-n-propyl, (meth) acrylic acid isopropyl, (meth) -n -Butyl, isobutyl (meth) acrylate, (meth) acrylic acid-n-hexyl, (meth) acrylic acid cyclohexyl, (meth) acrylic acid-n-heptyl, (meth) acrylic acid-n-octyl, (meth) 2-ethylhexyl acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, phenyl (meth)
  • the above-mentioned ethylenically unsaturated monomer preferably contains at least one of the structures of coumarone, indene, styrene, vinyltoluene, isoprene, piperylene and terpene.
  • the terpene structure include a ⁇ -pinene structure, an ⁇ -pinene structure, a ⁇ -limonene structure, and an ⁇ -limonene structure.
  • a hydrogenated terpene structure obtained by hydrogen reduction of these structures may be used.
  • cyclic organic compound that can be used in the present embodiment will be shown, but the cyclic organic compound is not limited thereto.
  • Examples of commercially available cyclic organic compounds include YS Resin TO125, YS Resin TO115, YS Resin TO105, YS Resin TO85, YS Resin TR105, Clearon K4100, Clearon K100, YS Polystar T80, and YS Polystar manufactured by Yashara Chemical Co., Ltd. UH115, YS Polyster NH, YS Resin SX100, YS Resin SX185, Knit Resin Coumarone V-120S manufactured by Nikkaku Chemical Co., Ltd., Knit Resin PH-25, Knit Resin PH-30-90T, Petcoal manufactured by Tosoh Corporation Examples include, but are not limited to, petrotac.
  • the cured layer preferably contains a photopolymerization initiator to accelerate the curing of the actinic radiation curable resin.
  • Specific examples of the photopolymerization initiator include alkylphenone series, acetophenone, benzophenone, hydroxybenzophenone, Michler's ketone, ⁇ -amyloxime ester, thioxanthone and the like, and derivatives thereof. It is not something.
  • Commercially available products may be used as the photopolymerization initiator, and preferred examples include Irgacure 184, Irgacure 907, and Irgacure 651 manufactured by BASF Japan.
  • the hardened layer may contain fine particles. Although it does not restrict
  • the silica fine particles may be hollow particles having cavities inside. Fine particles coated with a polymer silane coupling agent are particularly preferred because they exhibit good mechanical properties.
  • the polymer silane coupling agent refers to a reaction product of a polymerizable monomer and a silane coupling agent (reactive silane compound).
  • a polymer silane coupling agent can be obtained, for example, according to the method for producing a reaction product of a polymerizable monomer and a reactive silane compound disclosed in JP-A-11-116240.
  • polymerizable monomer examples include (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, (meth) acrylic acid-n-propyl, (meth) acrylic acid isopropyl, (meth) -N-butyl, isobutyl (meth) acrylate, (meth) acrylic acid-n-hexyl, (meth) acrylic acid cyclohexyl, (meth) acrylic acid-n-heptyl, (meth) acrylic acid-n-octyl, ( 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, phenyl (meth) acrylate, toluyl (meth) acrylate, benzyl (meth) acrylate , 2-methoxyethyl (meth) acrylate
  • an organosilicon compound represented by the following formula (1) is preferably used as the reactive silane compound.
  • XR-Si (OR) 3 (1) (In the formula, R represents an organic group having 1 to 10 carbon atoms selected from a substituted or unsubstituted hydrocarbon group.
  • X represents a (meth) acryloyl group, an epoxy group (glycid group), a urethane group, an amino group, One or more functional groups selected from fluoro groups.)
  • organosilicon compound represented by the formula (1) examples include 3,3,3-trifluoropropyltrimethoxysilane, methyl-3,3,3-trifluoropropyldimethoxysilane, ⁇ - (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, ⁇ -glycidoxymethyltrimethoxysilane, ⁇ -glycidoxymethyltriethoxysilane, ⁇ -glycidoxyethyltrimethoxysilane, ⁇ -glycidoxyethyltriethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropyltriethoxysilane, ⁇ -glycidoxypropyltriethoxysilane, ⁇ -glycidoxypropyltrie
  • Polymeric silane coupling agent is prepared by reacting a polymerizable monomer with a reactive silane compound. Specifically, an organic solvent solution in which a reactive silane compound is mixed in an amount of 0.5 to 20 parts by weight, further 1 to 10 parts by weight with respect to 100 parts by weight of the polymerizable monomer is prepared, and polymerization is started. It can be obtained by adding an agent and heating.
  • the polymer silane coupling agent-coated fine particles can be prepared by adding a polymer silane coupling agent to a fine particle organic solvent dispersion and coating the fine particles with the polymer silane coupling agent in the presence of an alkali.
  • the average particle diameter of the resulting polymer silane coupling agent-coated fine particles is preferably 5 to 500 nm, more preferably 10 to 200 nm, from the viewpoint of securing optical properties when used in an optical film.
  • the content of the polymer silane coupling agent-coated fine particles in the cured layer is preferably 0.5 to 80 parts by mass, more preferably 1 to 60 parts by mass as the solid content, from the viewpoint of securing the film strength of the cured layer. .
  • the hardened layer may contain a conductive agent in order to impart antistatic properties.
  • Preferred conductive agents include metal oxide particles or ⁇ -conjugated conductive polymers.
  • An ionic liquid is also preferably used as the conductive compound.
  • the cured layer may contain a fluorine-siloxane graft compound, a fluorine compound, a silicone compound, or a compound having an HLB value of 3 to 18 from the viewpoint of improving the coating property.
  • the hydrophilicity can be easily controlled by adjusting the types and amounts of these additives.
  • the HLB value is Hydrophile-Lipophile-Balance, that is, a hydrophilic-lipophilic balance, and is a value indicating the hydrophilicity or lipophilicity of a compound. The smaller the HLB value, the higher the lipophilicity, and the higher the value, the higher the hydrophilicity.
  • the HLB value can be obtained by the following calculation formula.
  • HLB 7 + 11.7Log (Mw / Mo)
  • Mw represents the molecular weight of the hydrophilic group
  • Mo represents the molecular weight of the lipophilic group
  • Mw + Mo M (molecular weight of the compound).
  • HLB value 20 ⁇ total formula weight of hydrophilic part / molecular weight (J. Soc. Cosmetic Chem., 5 (1954), 294) and the like.
  • Emulgen 109P (13.6), Emulgen 120 (15.3), Emulgen 123P (16.9), Emulgen 147 (16.3), Emulgen 210P (10.7), Emulgen 220 (14.2) , Emulgen 306P (9.4), Emulgen 320P (13.9), Emulgen 404 (8.8), Emulgen 408 (10.0), Emulgen 409PV (12.0), Emulgen 420 (13.6), Emulgen 430 (16.2), Emulgen 705 (10.5), Emulgen 707 (12.1), Emulgen 7 9 (13.3), Emulgen 1108 (13.5), Emulgen 1118S-70 (16.4), Emulgen 1135S-70 (17.9), Emulgen 2020G-HA (13.0), Emulgen 2025G (15.
  • Emulgen LS-106 (12.5), Emulgen LS-110 (13.4), Emulgen LS-114 (14.0), manufactured by Nissin Chemical Industry Co., Ltd .: Surfynol 104E (4), Surfynol 104H (4), Surfinol 104A (4), Surfinol 104BC (4), Surfinol 104DPM (4), Surfinol 104PA (4), Surfinol 104PG-50 (4), Surfinol 104S (4), Surfi Knoll 420 (4), Surfynol 440 (8), Surfynol 46 (13), Surfynol 485 (17), Surfynol SE (6), Shin-Etsu Chemical Co., Ltd.: X-22-4272 (7), X-22-6266 (8).
  • the fluorine-siloxane graft compound refers to a copolymer compound obtained by grafting polysiloxane and / or organopolysiloxane containing siloxane and / or organosiloxane alone on at least a fluorine resin.
  • a fluorine-siloxane graft compound can be prepared by a method as described in Examples described later.
  • examples of commercially available products include ZX-022H, ZX-007C, ZX-049, and ZX-047-D manufactured by Fuji Chemical Industry Co., Ltd.
  • fluorine-based compound examples include Megafac series (F-477, F-487, F-569, etc.) manufactured by DIC Corporation, OPTOOL DSX, OPTOOL DAC, etc. manufactured by Daikin Industries, Ltd.
  • silicone compounds are Shin-Etsu Chemical Co., Ltd .: KF-351, KF-352, KF-353, KF-354L, KF-355A, KF-615A, KF-945, KF-618, KF-6011, KF. -6015, KF-6004, manufactured by Big Chemie Japan KK: BYK-UV3576, BYK-UV3535, BYK-UV3510, BYK-UV3505, BYK-UV3500, BYK-UV3510, and the like. These components are preferably added in a range of 0.005 parts by mass or more and 10 parts by mass or less with respect to the solid component in the cured layer composition. Two or more kinds of these components may be added as long as the total additive amount is in the range of 0.005 parts by mass or more and 10 parts by mass or less.
  • the hardened layer may contain an ultraviolet absorber described in the cellulose ester film described later.
  • an ultraviolet absorber described in the cellulose ester film described later.
  • the cured layer in contact with the film substrate preferably contains the ultraviolet absorber.
  • the cured layer is a component that forms the cured layer described above, diluted with a solvent that swells or partially dissolves the film substrate, and is applied as a cured layer composition on the film substrate in the following manner, dried. It is preferable to provide it by curing.
  • Solvents include ketones (methyl ethyl ketone, acetone, etc.) and / or acetate esters (methyl acetate, ethyl acetate, butyl acetate, etc.), alcohols (ethanol, methanol, normal propanol, isopropanol), propylene glycol monomethyl ether, cyclohexanone, methyl isobutyl ketone. Etc. are preferable.
  • the coating amount of the cured layer composition is suitably an amount that results in a wet film thickness of 0.1 to 80 ⁇ m, and preferably an amount that results in a wet film thickness of 0.5 to 30 ⁇ m.
  • the dry film thickness is in the range of an average film thickness of 0.01 to 20 ⁇ m, preferably in the range of 1 to 15 ⁇ m. More preferably, it is in the range of 2 to 12 ⁇ m.
  • a known method such as a gravure coater, a dip coater, a reverse coater, a wire bar coater, a die coater, or an ink jet method can be used.
  • the cured layer is preferably composed of two or more layers from the viewpoint of surface hardness (abrasion resistance).
  • the outermost surface layer contains the above-described polymer silane coupling agent-coated fine particles.
  • the thickness of the cured layer in contact with the cellulose ester film substrate is preferably in the range of 0.01 to 50 ⁇ m, and the thickness of the second cured layer is 0.01 to 25 ⁇ m. It is preferable that it is the range of these.
  • Two or more layers may be formed by simultaneous multilayers.
  • the simultaneous multi-layer is to form a hardened layer by applying two or more hardened layers on a base material without going through a drying step.
  • the layers are stacked one after another with an extrusion coater or simultaneously with a slot die having a plurality of slits. Can be done.
  • the cured layer composition After applying the cured layer composition, it may be dried and cured (irradiated with actinic radiation (also referred to as UV curing treatment)), and if necessary, may be heat treated after UV curing.
  • the heat treatment temperature after UV curing is preferably 80 ° C. or higher, more preferably 100 ° C. or higher, and particularly preferably 120 ° C. or higher.
  • Drying is preferably performed at a temperature of 30% or more in the rate of drying section. More preferably, the temperature of the decreasing rate drying section is 50 ° C. or higher.
  • drying process changes from a constant state to a gradually decreasing state when drying starts.
  • a section in which the drying speed is constant is called a constant rate drying section, and a section in which the drying speed decreases is called a decreasing rate drying section.
  • any light source that generates ultraviolet rays can be used without limitation.
  • a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, or the like can be used.
  • Irradiation conditions vary depending on each lamp, but the irradiation amount of active rays is usually in the range of 50 to 1000 mJ / cm 2 , preferably in the range of 50 to 300 mJ / cm 2 .
  • oxygen removal for example, replacement with an inert gas such as nitrogen purge
  • the cured state of the surface can be controlled by adjusting the removal amount of the oxygen concentration.
  • the tension to be applied is preferably 30 to 300 N / m.
  • the method for applying tension is not particularly limited, and tension may be applied in the conveying direction on the back roller, or tension may be applied in the width direction or biaxial direction by a tenter. Thereby, a film having further excellent flatness can be obtained.
  • the back coat layer may provide a backcoat layer in the surface on the opposite side to the side which provided the hardened layer of the optical film.
  • the back coat layer is provided to correct curling caused by providing a hardened layer or other layers by coating or CVD. That is, the degree of curling can be balanced by imparting the property of being rounded with the surface on which the backcoat layer is provided facing inward.
  • the back coat layer is preferably applied also as an anti-blocking layer. In that case, fine particles may be added to the back coat layer coating composition to provide an anti-blocking function. preferable.
  • examples of inorganic compounds include silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, tin oxide, and oxide. Mention may be made of indium, zinc oxide, ITO, hydrated calcium silicate, aluminum silicate, magnesium silicate and calcium phosphate. Fine particles containing silicon are preferable in terms of low haze, and silicon dioxide is particularly preferable.
  • These fine particles are commercially available under the trade names of, for example, Aerosil R972, R972V, R974, R812, 200, 200V, 300, R202, OX50, and TT600 (manufactured by Nippon Aerosil Co., Ltd.). .
  • Zirconium oxide fine particles are commercially available, for example, under the trade names Aerosil R976 and R811 (manufactured by Nippon Aerosil Co., Ltd.) and can be used.
  • the polymer fine particles include a silicone resin, a fluororesin, and an acrylic resin. Silicone resins are preferable, and those having a three-dimensional network structure are particularly preferable. For example, Tospearl 103, 105, 108, 120, 145, 3120, and 240 (manufactured by Toshiba Silicone Co., Ltd.) It is marketed by name and can be used.
  • Aerosil 200V and Aerosil R972V are particularly preferably used because they have a large anti-blocking effect while keeping haze low.
  • the dynamic friction coefficient on the back side of the optical film used in this embodiment is preferably 0.9 or less, particularly preferably 0.1 to 0.9.
  • the fine particles contained in the backcoat layer are preferably contained in an amount of 0.1 to 50% by weight, more preferably 0.1 to 10% by weight, based on the binder.
  • the increase in haze when the backcoat layer is provided is preferably 1% or less, more preferably 0.5% or less, and particularly preferably 0.0 to 0.1%.
  • the backcoat layer is preferably formed by applying a composition containing a solvent that dissolves or swells the transparent resin film (film substrate).
  • the solvent to be used may include a solvent to be dissolved and / or a solvent to be swollen in addition to a solvent to be swelled, a composition in which these are mixed at an appropriate ratio depending on the degree of curl of the transparent resin film and the type of resin What is necessary is just to form by the application quantity.
  • Examples of the solvent for dissolving or swelling the transparent resin film contained in such a mixed composition include dioxane, acetone, methyl ethyl ketone, N, N-dimethylformamide, methyl acetate, ethyl acetate, cyclohexane, diacetone alcohol, 1 , 3-dioxolane, N-methylpyrrolidone, propylene glycol monomethyl ether acetate, propylene carbonate, cyclopentanone, 3-pentanone, 1,2-dimethoxyethane, tetrahydrofuran, ethyl lactate, bis (2-methoxyethyl) ether, acetic acid 2 -Methoxyethyl, propylene glycol dimethyl ether, trichloroethylene, methylene chloride, ethylene chloride, tetrachloroethane, trichloroethane, chloroform and the like.
  • solvent that does not dissolve examples include methanol, ethanol, n-propyl alcohol, i-propyl alcohol, n-butanol, propylene glycol monomethyl ether, and hydrocarbons (toluene, xylene, cyclohexanol).
  • the back coat layer may contain a resin as a binder.
  • the resin used as the binder for the backcoat layer include vinyl chloride-vinyl acetate copolymer, vinyl chloride resin, vinyl acetate resin, vinyl acetate-vinyl alcohol copolymer, partially hydrolyzed vinyl chloride-vinyl acetate copolymer.
  • Vinyl polymer or copolymer nitrocellulose, cellulose acetate propionate (preferably acetyl group substitution degree 1.8-2.3, propionyl group substitution degree 0.1-1.0), diacetylcellulose, cellulose Cellulose derivatives such as acetate butyrate resin, maleic acid and / or Or acrylic acid copolymer, acrylic ester copolymer, acrylonitrile-styrene copolymer, chlorinated polyethylene, acrylonitrile-chlorinated polyethylene-styrene copolymer, methyl methacrylate-butadiene-styrene copolymer, acrylic resin Rubber resins such as polyvinyl acetal resin, polyvinyl butyral resin, polyester polyurethane resin, polyether polyurethane resin, polycarbonate polyurethane resin, polyester resin, polyether resin, polyamide resin, amino resin, styrene-butadiene resin, butadiene-acrylonitrile resin, Examples thereof include, but are
  • acrylic resins Acrypet MD, VH, MF, V (manufactured by Mitsubishi Rayon Co., Ltd.), Hyperl M-4003, M-4005, M-4006, M-4202, M-5000, M-5001, M-4501 (manufactured by Negami Kogyo Co., Ltd.), Dialnal BR-50, BR-52, BR-53, BR-60, BR-64, BR-73, BR-75, BR-77, BR-79, BR -80, BR-82, BR-83, BR-85, BR-87, BR-88, BR-90, BR-93, BR-95, BR-100, BR-101, BR-102, BR-105 BR-106, BR-107, BR-108, BR-112, BR-113, BR-115, BR-116, BR-117, BR-118, etc.
  • the methacrylic monomers such as various homopolymers and copolymers were prepared as raw materials are commercially available and can also be selected as appropriate preferred from among these.
  • a cellulose resin layer such as diacetyl cellulose or cellulose acetate propionate is preferable.
  • the order of coating the backcoat layer may be before or after coating the cured layer on the side opposite to the backcoat layer of the optical film, but if the backcoat layer also serves as an anti-blocking layer, coat it first. It is desirable to do.
  • the back coat layer can be applied twice or more before and after the coating of the hardened layer.
  • the arithmetic average roughness Ra (JIS B0601: 2001) of the hardened layer is preferably in the range of 2 to 100 nm, particularly preferably in the range of 2 to 20 nm. By setting the arithmetic average roughness Ra within the above range, the visibility and the clearness are excellent.
  • the arithmetic average roughness Ra is a value measured with an optical interference surface roughness meter (manufactured by ZYGO, NewView) according to JIS B0601: 2001.
  • Haze The haze of the optical film is preferably in the range of 0.05% to 10% in view of visibility when used in an image display device. Haze can be measured according to JIS K7105 and JIS K7136.
  • index of hardness is HB or more. If the pencil hardness is equal to or higher than HB, it is difficult to be damaged in the polarizing plate forming step.
  • the cured optical layer was conditioned at a temperature of 23 ° C. and a relative humidity of 55% for 2 hours or more, and then the cured layer was JIS K5400 using a test pencil specified by JIS S 6006 under a load of 500 g. Is a value measured in accordance with the pencil hardness evaluation method defined by.
  • a film base material has a cellulose ester as a main component.
  • a cellulose ester as a main component. Examples thereof include a cellulose diacetate film, a cellulose triacetate film, a cellulose acetate propionate film, and a cellulose acetate butyrate film.
  • cellulose ester films examples include Konica Minoltack KC8UX, KC4UX, KC8UY, KC4UAY, KC6UA, KC4UA, KC2UA, KC4UE and KC4UZ (manufactured by Konica Minolta, Inc.).
  • the refractive index of the cellulose ester film is preferably 1.45 to 1.55.
  • the refractive index can be measured according to JIS K7142-2008.
  • the cellulose ester resin (hereinafter also referred to as cellulose ester or cellulose resin) is preferably a lower fatty acid ester of cellulose.
  • Lower fatty acid means a fatty acid having 6 or less carbon atoms.
  • the lower fatty acid ester of cellulose include, for example, cellulose acetate, cellulose diacetate, cellulose triacetate, cellulose propionate, cellulose butyrate and the like, and mixed fatty acid esters such as cellulose acetate propionate and cellulose acetate butyrate. it can.
  • Particularly preferably used lower fatty acid esters of cellulose are cellulose diacetate, cellulose triacetate, and cellulose acetate propionate. These cellulose esters can be used alone or in combination.
  • Cellulose diacetate preferably has an average degree of acetylation (bound acetic acid amount) of 51.0% to 56.0%.
  • Commercially available products include L20, L30, L40, and L50 manufactured by Daicel Corporation, and Ca398-3, Ca398-6, Ca398-10, Ca398-30, and Ca394-60S manufactured by Eastman Chemical Japan Co., Ltd. .
  • the cellulose triacetate preferably has an average degree of acetylation (bound acetic acid amount) of 54.0 to 62.5%, and more preferably cellulose triacetate having an average degree of acetylation of 58.0 to 62.5%. is there.
  • the cellulose triacetate preferably contains cellulose triacetate A and cellulose triacetate B.
  • Cellulose triacetate A is a cellulose triacetate having a number average molecular weight (Mn) of 125,000 or more and less than 155000, a weight average molecular weight (Mw) of 265,000 or more and less than 310,000, and Mw / Mn of 1.9 to 2.1.
  • Cellulose triacetate B has an acetyl group substitution degree of 2.75 to 2.90, Mn of 155,000 or more and less than 180,000, Mw of 290000 or more and less than 360,000, and Mw / Mn of 1.8 to 2.0.
  • Cellulose acetate propionate has an acyl group having 2 to 4 carbon atoms as a substituent, and when the substitution degree of acetyl group is X and the substitution degree of propionyl group or butyryl group is Y, the following formula (I ) And (II) are preferably satisfied at the same time.
  • the method for measuring the substitution degree of the acyl group can be measured according to ASTM-D817-96.
  • the number average molecular weight (Mn) and molecular weight distribution (Mw) of the cellulose ester can be measured using high performance liquid chromatography.
  • the measurement conditions are as follows.
  • the film substrate may be configured by using a thermoplastic acrylic resin in combination with a cellulose ester resin.
  • Acrylic resin also includes methacrylic resin.
  • the acrylic resin is not particularly limited but is preferably composed of 50 to 99% by mass of methyl methacrylate units and 1 to 50% by mass of other monomer units copolymerizable therewith.
  • Examples of other copolymerizable monomers include alkyl methacrylates having 2 to 18 alkyl carbon atoms, alkyl acrylates having 1 to 18 carbon atoms, alkyl acrylates such as acrylic acid and methacrylic acid.
  • 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. These may be used alone or in combination of two or more.
  • 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.
  • -Butyl acrylate is particularly preferably used.
  • the weight average molecular weight (Mw) is preferably 80,000 to 500,000, more preferably 110,000 to 500,000.
  • the weight average molecular weight of the acrylic resin can be measured by gel permeation chromatography.
  • Commercially available acrylic resins include, for example, Delpet 60N, 80N (Asahi Kasei Chemicals Corporation), Dianal BR52, BR80, BR83, BR85, BR88 (Mitsubishi Rayon Co., Ltd.), KT75 (Electrochemical Industry Co., Ltd.) )) And the like. Two or more acrylic resins can be used in combination.
  • a ⁇ / 4 film may be used as the cellulose ester film substrate.
  • the ⁇ / 4 film when the optical film of the present embodiment is incorporated in an image display device, it is preferable from the viewpoint of excellent visibility and crosstalk.
  • a ⁇ / 4 film refers to a film having an in-plane retardation of the film of about 1 ⁇ 4 with respect to a predetermined light wavelength (usually in the visible light region).
  • the ⁇ / 4 film is preferably a broadband ⁇ / 4 film having a phase difference of approximately 1 ⁇ 4 of the wavelength in the visible light wavelength range in order to obtain almost perfect circularly polarized light in the visible light wavelength range. .
  • the ⁇ / 4 film has an in-plane retardation value Ro (550) measured at a wavelength of 550 nm, preferably in the range of 60 nm to 220 nm, more preferably in the range of 80 nm to 200 nm, and more preferably in the range of 90 nm to 190 nm. More preferably, it is the range.
  • nx and ny are the maximum refractive index in the plane of the film (also referred to as the refractive index in the slow axis direction) out of the refractive index at 23 ° C.
  • Ro can be calculated by measuring the birefringence at each wavelength in an environment of 23 ° C. and 55% RH using an automatic birefringence meter KOBRA-21ADH (manufactured by Oji Scientific Instruments).
  • Ro (A) indicates an in-plane retardation value measured at a wavelength of Anm.
  • a circularly polarizing plate is obtained by laminating so that the angle between the slow axis of the ⁇ / 4 film and the transmission axis of the polarizer described later is substantially 45 °.
  • Substantially 45 ° means in the range of 30 ° to 60 °, more preferably in the range of 40 ° to 50 °.
  • the angle between the in-plane slow axis of the ⁇ / 4 film and the transmission axis of the polarizer is preferably 41 to 49 °, more preferably 42 to 48 °, and 43 to 47 °. Is more preferably 44 to 46 °.
  • the ⁇ / 4 film is not particularly limited as long as it is an optically transparent resin.
  • the cellulose-based resin described above can be used.
  • the ⁇ / 4 film is preferably a cellulose resin or a polycarbonate resin.
  • the ⁇ / 4 film is preferably a cellulose resin.
  • the retardation adjustment of ⁇ / 4 can be performed by adding the following retardation adjusting agent to the above-described film base material.
  • the retardation adjusting agent an aromatic compound having two or more aromatic rings as described in the specification of European Patent 911,656A2 can be used.
  • the aromatic ring of the aromatic compound includes an aromatic heterocycle in addition to an aromatic hydrocarbon ring. Particularly preferred is an aromatic heterocycle, and the aromatic heterocycle is generally an unsaturated heterocycle. Of these, a 1,3,5-triazine ring is particularly preferred.
  • Cellulose ester film base materials have, for example, acrylic particles, silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, kaolin, talc, calcined calcium silicate, hydrated calcium silicate, It is preferable to contain matting agents such as inorganic fine particles such as aluminum oxide, magnesium silicate, and calcium phosphate, and a crosslinked polymer.
  • the acrylic particles are not particularly limited, but are preferably multi-layered acrylic granular composites.
  • silicon dioxide is preferable in that the haze of the film substrate can be reduced.
  • the primary average particle diameter of the fine particles is preferably 20 nm or less, more preferably in the range of 5 to 16 nm, and particularly preferably in the range of 5 to 12 nm.
  • a cellulose-ester film base material contains the ester compound or sugar ester represented by the following general formula (X) from a viewpoint of the dimensional stability by an environmental change.
  • the ester compound represented by the general formula (X) will be described.
  • B is a hydroxy group or carboxylic acid residue
  • G is an alkylene glycol residue having 2 to 12 carbon atoms, an aryl glycol residue having 6 to 12 carbon atoms, or an oxyalkylene glycol residue having 4 to 12 carbon atoms.
  • A represents an alkylene dicarboxylic acid residue having 4 to 12 carbon atoms or an aryl dicarboxylic acid residue having 6 to 12 carbon atoms
  • n represents an integer of 1 or more.
  • the alkylene glycol component having 2 to 12 carbon atoms includes ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butanediol, 1,3-butanediol, 1,2-propanediol, 2-methyl 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 2,2-dimethyl-1,3-propanediol (neopentyl glycol), 2 , 2-diethyl-1,3-propanediol (3,3-dimethylolpentane), 2-n-butyl-2-ethyl-1,3-propanediol (3,3-dimethylolheptane), 3-methyl- 1,5-pentanediol 1,6-hexanediol, 2,2,4-trimethyl 1,3-pentanediol, 2-ethyl
  • alkylene glycols having 2 to 12 carbon atoms are particularly preferable because of excellent compatibility with cellulose acetate.
  • aryl glycol component having 6 to 12 carbon atoms include hydroquinone, resorcin, bisphenol A, bisphenol F, bisphenol and the like, and these glycols can be used as one kind or a mixture of two or more kinds.
  • Examples of the oxyalkylene glycol component having 4 to 12 carbon atoms include diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, and tripropylene glycol. These glycols may be used alone or in combination of two or more. Can be used as a mixture.
  • Examples of the alkylene dicarboxylic acid component having 4 to 12 carbon atoms include succinic acid, maleic acid, fumaric acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, and the like. Used as a mixture of two or more.
  • arylene dicarboxylic acid component having 6 to 12 carbon atoms examples include phthalic acid, terephthalic acid, isophthalic acid, 1,5 naphthalene dicarboxylic acid, and 1,4 naphthalene dicarboxylic acid.
  • Specific examples of the compound represented by formula (X) (compound X-1 to compound X-17) are shown below, but are not limited thereto.
  • the sugar ester compound is an ester other than cellulose ester, and is a compound obtained by esterifying all or part of the OH group of a sugar such as the following monosaccharide, disaccharide, trisaccharide or oligosaccharide.
  • sugar examples include glucose, galactose, mannose, fructose, xylose, arabinose, lactose, sucrose, nystose, 1F-fructosyl nystose, stachyose, maltitol, lactitol, lactulose, cellobiose, maltose, cellotriose, maltotriose, raffinose And kestose.
  • gentiobiose, gentiotriose, gentiotetraose, xylotriose, galactosyl sucrose, and the like are also included.
  • compounds having a furanose structure and / or a pyranose structure are particularly preferable.
  • sucrose, kestose, nystose, 1F-fructosyl nystose, stachyose and the like are preferable, and sucrose is more preferable.
  • oligosaccharides maltooligosaccharides, isomaltooligosaccharides, fructooligosaccharides, galactooligosaccharides, and xylo-oligosaccharides can also be preferably used.
  • the monocarboxylic acid used for esterifying the sugar is not particularly limited, and known aliphatic monocarboxylic acid, alicyclic monocarboxylic acid, aromatic monocarboxylic acid and the like can be used.
  • the carboxylic acid to be used may be one kind or a mixture of two or more kinds.
  • Preferred aliphatic monocarboxylic acids include acetic acid, propionic acid, butyric acid, isobutyric 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 acid, and laxelic acid And unsaturated fatty acids such as undecylenic acid, oleic acid, sorbic acid, linoleic acid, linolenic acid, arachidonic acid and octen
  • Examples of preferred alicyclic monocarboxylic acids include cyclopentane carboxylic acid, cyclohexane carboxylic acid, cyclooctane carboxylic acid, or derivatives thereof.
  • Examples of preferred aromatic monocarboxylic acids include benzoic acid, aromatic monocarboxylic acids having an alkyl group or alkoxy group introduced into the benzene ring of benzoic acid, cinnamic acid, benzylic acid, biphenylcarboxylic acid, naphthalenecarboxylic acid, tetralin
  • An aromatic monocarboxylic acid having two or more benzene rings such as carboxylic acid, or a derivative thereof can be mentioned, and more specifically, xylic acid, hemelic acid, mesitylene acid, planicylic acid, ⁇ -isojurylic acid, Julylic acid, mesitic acid, ⁇ -isoduric acid, cumic acid, ⁇ -toluic acid, hydroatropic acid
  • the ester compound or sugar ester compound represented by the general formula (X) is preferably contained in the cellulose acetate film in an amount of 1 to 30% by mass, more preferably 5 to 25% by mass. It is particularly preferred that
  • the cellulose ester film substrate may contain a plasticizer as necessary.
  • the plasticizer is not particularly limited, but is a polycarboxylic acid ester plasticizer, glycolate plasticizer, phthalate ester plasticizer, phosphate ester plasticizer, polyhydric alcohol ester plasticizer, acrylic plasticizer. Agents and the like. In these, an acrylic plasticizer is preferable from the viewpoint of easily controlling the cellulose ester film to the retardation value described later.
  • the polyhydric alcohol ester plasticizer is a plasticizer composed of an ester of a divalent or higher aliphatic polyhydric alcohol and a monocarboxylic acid, and preferably has an aromatic ring or a cycloalkyl ring in the molecule.
  • a divalent to 20-valent aliphatic polyhydric alcohol ester is preferred.
  • the above-described plasticizer is contained in the cellulose ester film substrate of the present embodiment, it is preferably contained in an amount of 1 to 50% by mass, more preferably 5 to 35% by mass, based on cellulose acetate. The content of 5 to 25% by mass is particularly preferable.
  • the cellulose ester film substrate of this embodiment may contain an ultraviolet absorber. Since the ultraviolet absorber absorbs ultraviolet rays of 400 nm or less, durability can be improved. In particular, the ultraviolet absorber preferably has a transmittance of 10% or less at a wavelength of 370 nm, more preferably 5% or less, and still more preferably 2% or less. Specific examples of the ultraviolet absorber are not particularly limited. For example, oxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, benzophenone compounds, cyanoacrylate compounds, triazine compounds, nickel complex salts, inorganic powders. Examples include the body.
  • 5-chloro-2- (3,5-di-sec-butyl-2-hydroxylphenyl) -2H-benzotriazole, (2-2H-benzotriazol-2-yl) -6 -(Linear and side chain dodecyl) -4-methylphenol, 2-hydroxy-4-benzyloxybenzophenone, 2,4-benzyloxybenzophenone, and the like can be used.
  • Commercially available products may be used.
  • TINUVIN such as TINUVIN 109, TINUVIN 171, TINUVIN 234, TINUVIN 326, TINUVIN 327, and TINUVIN 328 manufactured by BASF Japan Ltd. can be preferably used.
  • UV absorbers are benzotriazole ultraviolet absorbers, benzophenone ultraviolet absorbers, and triazine ultraviolet absorbers, and particularly preferably benzotriazole ultraviolet absorbers and benzophenone ultraviolet absorbers.
  • a discotic compound such as a compound having a 1,3,5 triazine ring is also preferably used as the ultraviolet absorber.
  • a polymer UV absorber can be preferably used, and a polymer type UV absorber is particularly preferably used.
  • TINUVIN 109 octyl-3- [3-tert-butyl-4-hydroxy-5- (5-chloro-2H-benzotriazole-2-) manufactured by BASF Japan Ltd., which is a commercial product, is available.
  • TINUVIN 400 (4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl) -manufactured by BASF Japan Ltd.- Reaction product of 5-hydroxyphenyl and oxirane
  • TINUVIN 460 (2,4-bis [2-hydroxy-4-butoxyphenyl] -6- (2,4-dibutoxyphenyl) -1,3-5 Triazine)
  • TINUVIN 405 (2- (2,4-dihydroxyphenyl) -4,6-bis- (2,4-dimethylphenyl) -1,3,5-triazine and (2-ethylhexyl) -glycidic acid ester Reaction products) and the like.
  • the ultraviolet absorber is added by dissolving the ultraviolet absorber in an alcohol, such as methanol, ethanol, butanol or the like, an organic solvent such as methylene chloride, methyl acetate, acetone, dioxolane, or a mixed solvent thereof, and then becomes a film substrate. It may be added to the resin solution (dope) or directly during the dope composition.
  • an organic solvent such as methylene chloride, methyl acetate, acetone, dioxolane, or a mixed solvent thereof.
  • a dissolver or a sand mill is used in the organic solvent and cellulose acetate to disperse and then added to the dope.
  • the amount of the ultraviolet absorber used is preferably 0.5 to 10% by mass, more preferably 0.6 to 4% by mass with respect to the cellulose acetate film.
  • the cellulose ester film substrate of the present embodiment may further contain an antioxidant (deterioration inhibitor).
  • the antioxidant has a role of delaying or preventing the cellulose acetate film from being decomposed by a residual solvent amount of halogen in the cellulose acetate film, phosphoric acid of a phosphoric acid plasticizer, or the like.
  • hindered phenol compounds are preferably used.
  • 2,6-di-t-butyl-p-cresol, pentaerythrityl-tetrakis [3- (3,5-di-t-butyl) are used.
  • the cellulose ester film substrate preferably has a defect of 5 ⁇ m or more in diameter 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 the defect is not circular, the range of the defect is determined by observing with a microscope by 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 roller scratch or an abrasion
  • the size can be 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. Moreover, when the diameter of a defect becomes 5 micrometers or more, it can confirm visually by polarizing plate observation etc., and when used as an optical member, a bright spot may arise.
  • the coating film may not be formed uniformly, resulting 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 cellulose ester film base material preferably has a breaking elongation in at least one direction of 10% or more, more preferably 20% or more, as measured in accordance with 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 cellulose ester film base material preferably has a total light transmittance of 90% or more, more preferably 92% or more. Moreover, as a realistic upper limit, it is about 99%.
  • the haze value is preferably 2% or less, more preferably 1.5% or less.
  • the total light transmittance and haze value can be measured according to JIS K7361 and JIS K7136.
  • the in-plane retardation value Ro of the cellulose ester film substrate is preferably in the range of 0 to 5 nm, and the retardation value Rth in the thickness direction is preferably in the range of ⁇ 10 to 10 nm. Further, Rth is preferably in the range of -5 to 5 nm. Alternatively, the retardation Ro is preferably in the range of 30 to 200 nm, and more preferably in the range of 30 to 90 nm. The retardation Rth in the thickness direction is preferably in the range of 70 to 300 nm.
  • the in-plane retardation Ro value is defined by the following formula (I), and the retardation value Rth in the thickness direction is defined by the following formula (II).
  • Formula (I) Ro (nx ⁇ ny) ⁇ d
  • Formula (II) Rth ⁇ (nx + ny) / 2 ⁇ nz ⁇ ⁇ d (Where nx is the refractive index in the slow axis direction in the plane of the film base, ny is the refractive index in the direction perpendicular to the slow axis in the plane of the film base, and nz is the thickness direction of the film base) (Refractive index, d represents the thickness (nm) of the film substrate, respectively)
  • the retardation can be obtained at a wavelength of 590 nm under an environment of 23 ° C. and 55% RH (relative humidity) using, for example, KOBRA-21ADH (manufactured by Oji Scientific Instruments).
  • the film forming method is not limited to this.
  • a production method such as an inflation method, a T-die method, a calendar method, a cutting method, a casting method, an emulsion method, a hot press method, or the like can be used.
  • Organic solvent An organic solvent useful for forming a resin solution (dope composition) in the case of producing a cellulose ester film by a solution casting film forming method described later is one that can simultaneously dissolve a cellulose ester resin and other additives. Can be used without limitation.
  • a chlorinated organic solvent methylene chloride
  • 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, methanol, ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, tert-butan
  • Can, methylene chloride, methyl acetate, ethyl acetate, may be used preferably acetone.
  • the solvent is preferably a dope composition in which a total of 15 to 45 mass% of cellulose ester resin and other additives are dissolved.
  • solution casting film forming method a step of preparing a dope by dissolving a resin and an additive in a solvent, a step of casting the dope on a belt-shaped or drum-shaped metal support, and drying the cast dope as a web It is carried out by a step of peeling off from the metal support, a step of stretching or maintaining the width, a step of further drying, and a step of winding up the finished cellulose ester film.
  • a stainless steel belt or a drum whose surface is plated with a casting is preferably used.
  • the width of the cast (casting) can be 1 to 4 m.
  • the surface temperature of the metal support in the casting process is set to ⁇ 50 ° C. to a temperature at which the solvent boils and does not foam. A higher temperature is preferred because the web can be dried faster, but if it is too high, the web may foam or the flatness may deteriorate.
  • a preferable support temperature is appropriately determined at 0 to 100 ° C., and more preferably 5 to 30 ° C.
  • the method for controlling the temperature of the metal support is not particularly limited, and there are a method of blowing warm air or cold air, and a method of contacting hot water with the back side of the metal support. It is preferable to use warm water because heat transfer is performed efficiently, so that the time until the temperature of the metal support becomes constant is short.
  • the residual solvent amount when peeling the web from the metal support is preferably 10 to 150% by mass, more preferably 20 to 40% by mass or 60 to 60%. It is 130% by mass, particularly preferably 20 to 30% by mass or 70 to 120% by mass.
  • M is the mass of the sample collected at any time during or after the production of the web or film
  • N is the mass after heating at 115 ° C. for 1 hour.
  • the web is peeled off from the metal support and dried to make the residual solvent amount 1% by mass or less, more preferably 0.1% by mass or less, and particularly preferably 0. -0.01 mass% or less.
  • a roller drying method (a method in which webs are alternately passed through a plurality of rollers arranged above and below) and a method in which the web is dried while being conveyed by a tenter method are employed.
  • the film in the stretching step, can be sequentially or simultaneously stretched in the longitudinal direction (MD direction) and the lateral direction (TD direction).
  • the draw ratios in the biaxial directions perpendicular to each other are preferably in the range of 1.0 to 2.0 times in the MD direction and 1.05 to 2.0 times in the TD direction, respectively. More preferably, it is carried out in the range of 1.0 to 1.5 times and 1.05 to 2.0 times in the TD direction.
  • a method of making a difference in peripheral speed between a plurality of rollers and stretching in the MD direction using the difference in peripheral speed of the roller between them, fixing both ends of the web with clips and pins, and widening the interval between the clips and pins in the traveling direction And a method of stretching in the MD direction, a method of stretching in the lateral direction and stretching in the TD direction, a method of stretching the MD direction and the TD direction simultaneously, and stretching in both directions.
  • a tenter it may be a pin tenter or a clip tenter.
  • the film transport tension in the film forming process such as a tenter is preferably 120 to 200 N / m, more preferably 140 to 200 N / m, and most preferably 140 to 160 N / m, although it depends on the temperature.
  • the stretching temperature is (Tg-30) to (Tg + 100) ° C., more preferably (Tg-20) to (Tg + 80) ° C., more preferably (Tg-5), where Tg is the glass transition temperature of the cellulose ester film. ⁇ (Tg + 20) ° C.
  • the Tg of the cellulose ester film can be controlled by the material type constituting the film and the ratio of the constituting materials.
  • the Tg when the cellulose ester film is dried is preferably 110 ° C. or higher, more preferably 120 ° C. or higher. Especially preferably, it is 150 degreeC or more.
  • the glass transition temperature is preferably 190 ° C. or lower, more preferably 170 ° C. or lower.
  • the Tg of the cellulose ester film can be determined by the method described in JIS K7121.
  • the stretching temperature is preferably 150 ° C. or more and the stretching ratio is 1.15 times or more because the surface is appropriately roughened. Roughening the surface of the cellulose ester film is preferable because it improves slipperiness and improves surface processability.
  • the cellulose ester film substrate may be formed by a melt casting method.
  • a composition containing other additives such as a cellulose ester resin and a plasticizer is heated and melted to a temperature showing fluidity, and then a melt containing the fluid cellulose ester is cast. To do.
  • the melt extrusion method is preferable from the viewpoint of mechanical strength and surface accuracy. It is preferable that a plurality of raw materials used for melt extrusion are usually kneaded in advance and pelletized.
  • Pelletization may be performed by a known method, for example, dry cellulose ester, plasticizer, and other additives are fed to an extruder with a feeder, kneaded using a single or twin screw extruder, and formed into a strand from a die. Can be extruded, water-cooled or air-cooled, and then cut.
  • Additives may be mixed before being supplied to the extruder, or may be supplied by individual feeders.
  • a small amount of additives such as particles and antioxidants are preferably mixed in advance in order to mix uniformly.
  • the extruder is preferably processed at a temperature as low as possible so that it can be pelletized so that the shearing force is suppressed and the resin does not deteriorate (molecular weight reduction, coloring, gel formation, etc.).
  • a temperature as low as possible so that it can be pelletized so that the shearing force is suppressed and the resin does not deteriorate (molecular weight reduction, coloring, gel formation, etc.).
  • the resin does not deteriorate (molecular weight reduction, coloring, gel formation, etc.).
  • a twin screw extruder it is preferable to rotate in the same direction using a deep groove type screw. From the uniformity of kneading, the meshing type is preferable.
  • Film formation is performed using the pellets obtained as described above.
  • the raw material powder can be directly fed to the extruder by a feeder without being pelletized to form a film as it is.
  • the pellets are melted at a temperature of about 200 to 300 ° C, filtered through a leaf disk filter, etc. to remove foreign matter, and then formed into a film from the T die.
  • the cellulose ester film is formed by niping the film with a cooling roller and an elastic touch roller and solidifying the film on the cooling roller.
  • the extrusion flow rate is preferably adjusted stably by introducing a gear pump or the like.
  • a stainless fiber sintered filter is preferably used as a filter used for removing foreign substances.
  • the stainless steel fiber sintered filter is a united stainless steel fiber body that is intricately intertwined and compressed, and the contact points are sintered and integrated. The density of the fiber is changed depending on the thickness of the fiber and the amount of compression, and the filtration accuracy is improved. Can be adjusted.
  • Additives such as plasticizers and particles may be mixed with the resin in advance, or may be kneaded in the middle of the extruder. In order to add uniformly, it is preferable to use a mixing apparatus such as a static mixer.
  • the cellulose ester film temperature on the touch roller side when the cellulose ester film is nipped by the cooling roller and the elastic touch roller is preferably Tg or more (Tg + 110 ° C.) or less of the film.
  • a known roller can be used as the roller having an elastic surface used for such a purpose.
  • the elastic touch roller is also called a pinching rotator.
  • a commercially available elastic touch roller can also be used.
  • the cellulose ester film obtained as described above is stretched by the stretching operation after passing through the step of contacting the cooling roller.
  • the stretching method a known roller stretching machine or tenter can be preferably used.
  • the stretching temperature is usually preferably in the temperature range of Tg to (Tg + 60) ° C. of the resin constituting the film.
  • the end Before winding, the end may be slit and trimmed to the width of the product, and knurled (embossed) may be applied to both ends to prevent sticking and scratching during winding.
  • the knurling method can be performed by heating or pressurizing using a metal ring having an uneven pattern on the side surface.
  • the grip portion of the clip at both ends of the film is usually cut out and reused because the cellulose ester film is deformed and cannot be used as a product.
  • the ⁇ / 4 film can be produced by a method for producing an obliquely stretched film.
  • the method for producing an obliquely stretched film is a method for producing a stretched film having a slow axis at an angle of more than 0 ° and less than 90 ° with respect to the extending direction of the film.
  • the unstretched film before oblique stretching the cellulose ester film described above can be used.
  • the angle with respect to the extending direction of the film is an angle in the film plane. Since the slow axis is usually expressed in the stretching direction or a direction perpendicular to the stretching direction, stretching having such a slow axis is performed by stretching at an angle of more than 0 ° and less than 90 ° with respect to the extending direction of the film.
  • a film can be manufactured.
  • the angle between the film extension direction and the slow axis can be arbitrarily set to a desired angle in the range of more than 0 ° and less than 90 °, more preferably 10 ° to 80 °. °, more preferably 40 ° to 50 °.
  • the obliquely stretched film can be produced using an obliquely stretching apparatus (obliquely stretched tenter).
  • obliquely stretched tenter As an obliquely stretched tenter, the orientation angle of the film can be set freely by changing the rail pattern in various ways, and furthermore, the orientation axis of the film can be oriented with high precision evenly on the left and right across the width direction of the film.
  • An apparatus capable of controlling the film thickness and retardation with high accuracy can be preferably used.
  • the film thickness of the cellulose ester film substrate is preferably 5 to 200 ⁇ m, more preferably 5 to 80 ⁇ m, and particularly preferably 5 to 34 ⁇ m. By forming the cured layer of this embodiment on a thin cellulose ester film substrate, the effect of this embodiment is more easily exhibited.
  • the length of the cellulose ester film substrate is preferably 500 to 10,000 m, more preferably 1000 to 8000 m. By setting it as the range of the said length, it is excellent in the processability in application
  • the arithmetic average roughness Ra of the cellulose ester film substrate is preferably 2 to 10 nm, more preferably 2 to 5 nm.
  • the arithmetic average roughness Ra can be measured according to JIS B0601: 1994.
  • optical film of this embodiment can be provided with other layers such as an antireflection layer and a conductive layer.
  • the optical film of this embodiment can be used as an antireflection film having an external light antireflection function by coating an antireflection layer on a cured layer.
  • the antireflection layer is preferably laminated in consideration of the refractive index, the film thickness, the number of layers, the layer order, and the like so that the reflectance is reduced by optical interference.
  • the antireflection layer is composed of a low refractive index layer having a lower refractive index than the protective film as the support, or a combination of a high refractive index layer and a low refractive index layer having a higher refractive index than the protective film as the support. Preferably it is.
  • the low refractive index layer preferably contains silica-based fine particles, and the refractive index is preferably in the range of 1.30 to 1.45 when measured at 23 ° C. and wavelength of 550 nm.
  • the film thickness of the low refractive index layer is preferably in the range of 5 nm to 0.5 ⁇ m, more preferably in the range of 10 nm to 0.3 ⁇ m, and in the range of 30 nm to 0.2 ⁇ m. Most preferred.
  • the composition for forming a low refractive index layer preferably contains at least one kind of particles having an outer shell layer and porous or hollow inside as silica-based fine particles.
  • the particles having the outer shell layer and porous or hollow inside are preferably hollow silica-based fine particles.
  • the composition for forming a low refractive index layer may contain an organosilicon compound represented by the following general formula (OSi-1) or a hydrolyzate thereof, or a polycondensate thereof.
  • OSi-1) Si (OR) 4
  • R represents an alkyl group having 1 to 4 carbon atoms.
  • tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane and the like are preferably used as the organosilicon compound represented by the general formula.
  • a compound having a thermosetting property and / or a photocurable property which mainly contains a fluorine-containing compound containing a fluorine atom in a range of 35 to 80% by mass and containing a crosslinkable or polymerizable functional group, has a low refractive index. You may make it contain in the composition for layer formation. Specifically, a fluorine-containing polymer or a fluorine-containing sol-gel compound is used.
  • fluorine-containing polymer examples include hydrolysates and dehydration condensates of perfluoroalkyl group-containing silane compounds [eg (heptadecafluoro-1,1,2,2-tetrahydrodecyl) triethoxysilane], and fluorine-containing monomers. Examples thereof include fluorine-containing copolymers having units and cross-linking reactive units as constituent units.
  • ⁇ High refractive index layer> In the high refractive index layer, it is preferable to adjust the refractive index to a range of 1.4 to 2.2 by measuring at 23 ° C. and a wavelength of 550 nm.
  • the thickness of the high refractive index layer is preferably 5 nm to 1 ⁇ m, more preferably 10 nm to 0.2 ⁇ m, and most preferably 30 nm to 0.1 ⁇ m. Adjustment of the refractive index can be achieved by adding metal oxide fine particles and the like.
  • the metal oxide fine particles used preferably have a refractive index of 1.80 to 2.60, more preferably 1.85 to 2.50.
  • the kind of metal oxide fine particles is not particularly limited, and Ti, Zr, Sn, Sb, Cu, Fe, Mn, Pb, Cd, As, Cr, Hg, Zn, Al, Mg, Si, P and S A metal oxide having at least one element selected from can be used.
  • a conductive layer may be formed on the cured layer.
  • a generally well-known conductive material can be used.
  • metal oxides such as indium oxide, tin oxide, indium tin oxide, gold, silver, and palladium can be used. These can be formed as a thin film on an optical film by a vacuum deposition method, a sputtering method, an ion plating method, a solution coating method, or the like.
  • a conductive material that is excellent in transparency and conductivity, and that has a main component of any one of indium oxide, tin oxide, and indium tin oxide obtained at a relatively low cost can be suitably used.
  • the thickness of the conductive layer varies depending on the material to be applied, it cannot be said unconditionally.
  • the surface resistivity is 1000 ⁇ or less, preferably 500 ⁇ or less, and considering the economy, A range of 10 nm or more, preferably 20 nm or more and 80 nm or less, preferably 70 nm or less is suitable. In such a thin film, visible light interference fringes due to uneven thickness of the conductive layer are unlikely to occur.
  • the polarizing plate can be produced by a general method. For example, an optical film is subjected to alkali saponification treatment, and the treated optical film is bonded to one surface of a polarizing film (polarizer) produced by immersing and stretching in an iodine solution using a completely saponified polyvinyl alcohol aqueous solution. Is preferred.
  • polarizer polarizing film
  • the optical film may be bonded to the other surface of the polarizer, or the cellulose ester film substrate described above may be bonded.
  • the film thickness of the film substrate to be bonded to the other surface is preferably in the range of 5 to 100 ⁇ m, more preferably in the range of 5 to 34 ⁇ m, from the viewpoint of adjusting smoothness and curl balance and further improving the effect of preventing winding deviation.
  • the polarizing film which is the main component of the polarizing plate, is an element that transmits only light having a polarization plane in a certain direction, and a typical polarizing film that is known at present is a polyvinyl alcohol polarizing film.
  • the polarizing film includes a polyvinyl alcohol film dyed with iodine and a dichroic dye dyed, but is not limited thereto.
  • polarizing film a polyvinyl alcohol aqueous solution is formed and dyed by uniaxial stretching or dyeing, or after uniaxial stretching after dyeing, a film subjected to durability treatment with a boron compound is preferably used.
  • the thickness of the polarizing film is 5 to 30 ⁇ m, preferably 8 to 15 ⁇ m.
  • a polarizing plate is formed by bonding one side of the optical film of the present embodiment on the surface of the polarizing film. It is preferably bonded with an aqueous adhesive mainly composed of completely saponified polyvinyl alcohol or the like.
  • a circularly polarizing plate can also be constituted using an optical film. That is, a circularly polarizing plate can be formed by laminating a polarizing plate protective film, a polarizer, and a ⁇ / 4 film in this order. In this case, the angle formed between the slow axis of the ⁇ / 4 film and the absorption axis (or transmission axis) of the polarizing film is 45 °.
  • a long polarizing plate protective film, a long polarizer, and a long ⁇ / 4 film (long diagonally stretched film) are preferably laminated in this order.
  • the circularly polarizing plate can be produced by using a stretched polyvinyl alcohol doped with iodine or a dichroic dye as a polarizer, and laminating with a configuration of ⁇ / 4 film / polarizer.
  • the thickness of the polarizer is 5 to 40 ⁇ m, preferably 5 to 30 ⁇ m, particularly preferably 5 to 20 ⁇ m.
  • the circularly polarizing plate can be produced by a general method. In other words, it is preferable to attach an alkali saponified ⁇ / 4 film to one surface of a polarizer produced by immersing and stretching a polyvinyl alcohol film in an iodine solution, using a completely saponified polyvinyl alcohol aqueous solution.
  • the pressure-sensitive adhesive layer used on one side of the film of the polarizing plate is preferably optically transparent and exhibits moderate viscoelasticity and pressure-sensitive adhesive properties.
  • the adhesive layer include adhesives or adhesives such as acrylic copolymers, epoxy resins, polyurethane, silicone polymers, polyethers, butyral resins, polyamide resins, polyvinyl alcohol resins, and synthetic rubbers.
  • a film such as a drying method, a chemical curing method, a thermal curing method, a thermal melting method, a photocuring method, or the like can be formed and cured using a polymer such as the above.
  • the acrylic copolymer can be preferably used because it is most easy to control the physical properties of the adhesive and is excellent in transparency, weather resistance, durability and the like.
  • the optical film of this embodiment is preferable in that the performance excellent in visibility is exhibited by using it for an image display apparatus.
  • an image display device a reflection type, a transmission type, a transflective type liquid crystal display device, a liquid crystal display device of various driving methods such as a TN type, an STN type, an OCB type, a VA type, an IPS type, and an ECB type, an organic EL display Examples thereof include a device and a plasma display.
  • a liquid crystal display device is preferable because of its high visibility.
  • Protective part may be arranged on the further viewing side of the cured layer of the optical film of the viewing side polarizing plate.
  • This protection part can be constituted by a front plate or a touch panel.
  • the said protection part is bonded together by the said hardened layer via the filler (photocurable resin) for filling the space
  • the front plate in particular of a protection part is not restrict
  • a solvent-free filler is preferable, and as commercially available products, for example, SVR1120, SVR1150, SVR1320 (above, manufactured by Dexerials Corporation), or HRJ-60, HRJ-302, HRJ-53 (above, Kyoritsu Chemical Industry) And the like).
  • SVR1120, SVR1150, SVR1320 above, manufactured by Dexerials Corporation
  • HRJ-60, HRJ-302, HRJ-53 above, Kyoritsu Chemical Industry
  • Bonding of the optical film and the front plate can be performed as follows, for example. First, a filler is prepared. Then, a filler is applied to the surface of the cured layer of the optical film, and the front plate is overlaid on the coating film of the filler. In this state, the filler is cured by light irradiation or the like, and the optical film and the front plate are bonded together. When the filler is applied to the surface of the cured layer, the surface free energy of the cured layer is set to 30 mN / m or more so that the filler is uniformly spread without being repelled at the end of the cured layer. An image display device that is maintained and has excellent visibility can be obtained.
  • Example 1 [Production of Cellulose Ester Film 1] ⁇ Preparation of silicon dioxide dispersion> Aerosil R812 (Nippon Aerosil Co., Ltd., average primary particle diameter of 7 nm) 10 parts by mass Ethanol 90 parts by mass The above was stirred and mixed with a dissolver for 30 minutes, and then dispersed with Manton Gorin. 88 parts by mass of methylene chloride was added to the silicon dioxide dispersion while stirring, and the mixture was stirred and mixed for 30 minutes with a dissolver to prepare a silicon dioxide dispersion dilution. The mixture was filtered with a fine particle dispersion dilution filter (Advantech Toyo Co., Ltd .: polypropylene wind cartridge filter TCW-PPS-1N).
  • a fine particle dispersion dilution filter Advancedtech Toyo Co., Ltd .: polypropylene wind cartridge filter TCW-PPS-1N).
  • the belt was cast evenly on a stainless steel band support using a belt casting apparatus.
  • the solvent was evaporated until the residual solvent amount reached 100% by mass, and the stainless steel band support was peeled off.
  • the cellulose ester film web was evaporated at 35 ° C., slit to 1.15 m width, and dried at a drying temperature of 140 ° C. while being stretched 1.15 times in the TD direction (film width direction) with a tenter. I let you. Then, it was dried for 15 minutes while being transported in a drying device at 120 ° C.
  • the cellulose ester film 1 was obtained.
  • the cellulose ester film 1 had a film thickness of 15 ⁇ m and a winding length of 3900 m.
  • the following cured layer composition 1 is applied onto the A side (the surface not in contact with the casting belt) of the produced cellulose ester film 1 using an extrusion coater, and the constant rate drying zone temperature is 50 ° C., the rate of decrease.
  • the irradiance of the irradiated part is 100 mW / cm 2 using an ultraviolet lamp, and the irradiation amount is set to 0.
  • the coating layer was cured at 25 J / cm 2 to form a cured layer 1 having a dry film thickness of 5 ⁇ m, and wound into a roll to produce an optical film 1.
  • Hardened layer composition 1 >> ⁇ Composition of cured layer composition 1> (Actinic radiation curable resin) NK Ester A-DCP (Tricyclodecane dimethanol diacrylate, manufactured by Shin-Nakamura Chemical Co., Ltd.) 92 parts by mass (photopolymerization initiator) Irgacure 184 (manufactured by BASF Japan) 5 parts by mass (additive) Silicone compound (BYK-UV3510, manufactured by BYK Japan) 1 part by mass (cyclic organic compound) B-1 (YS Polystar NH, manufactured by Yasuhara Chemical Co., Ltd.) 8 parts by mass (solvent) Propylene glycol monomethyl ether 10 parts by weight Methyl ethyl ketone 90 parts by weight
  • Optical film 2 was produced in the same manner as optical film 1 except that cyclic organic compound B-1 was changed to cyclic organic compound B-2.
  • the method for synthesizing cyclic organic compound B-2 is as follows.
  • step (B) suspension polymerization was carried out for 5 hours while maintaining the temperature in the autoclave at 120 ° C. to obtain a polymer (organic cyclic compound B-2).
  • optical film 3 An optical film 3 was produced in the same manner as the optical film 1 except that the cyclic organic compound B-1 was changed to the cyclic organic compound B-3.
  • the method for synthesizing cyclic organic compound B-3 is as follows.
  • a mixed solution is prepared under the same conditions as in the method for synthesizing cyclic organic compound B-2, and suspension polymerization is further performed in steps (A) and (B) to obtain a polymer (cyclic organic compound B). -3) was obtained.
  • optical film 4 was prepared in the same manner as optical film 1 except that cyclic organic compound B-1 was changed to cyclic organic compound B-4 (YS Resin TO105, manufactured by Yasuhara Chemical Co., Ltd.).
  • optical film 5 was prepared in the same manner as the optical film 1 except that the cyclic organic compound B-1 was changed to a cyclic organic compound B-5 (Knit Resin Coumarone V-120S, manufactured by Nikko Chemical Co., Ltd.). Produced.
  • optical film 6 An optical film 6 was produced in the same manner as the optical film 1 except that the cyclic organic compound B-1 was changed to the cyclic organic compound C-1.
  • the method for synthesizing cyclic organic compound C-1 is as follows.
  • a raw material solution was supplied at a rate of 5.0 L / hour and an ethylbenzene solution of an initiator was supplied at a rate of 0.1 L / hour to a complete mixing tank having an internal volume of 20 L equipped with a double helical ribbon blade inside.
  • Polymerization was conducted at a temperature of 120 ° C. under a stirring speed of 120 rpm.
  • the polymerization reaction liquid that passed through the complete mixing tank was continuously introduced into a tubular reactor having an internal volume of 30 L, which was connected to the complete mixing tank, and was equipped with a static mixer inside. The polymerization reaction was performed under conditions such that the reaction solution temperature was 150 ° C.
  • the obtained polymerization reaction liquid is continuously supplied to a devolatilization apparatus composed of a flash drum having a heater, and volatile components such as unreacted monomers and solvents are separated under conditions of a temperature of 220 ° C. and a pressure of 665 Pa.
  • a polymer (cyclic organic compound C-1) was obtained.
  • the content rate of the styrene structural unit in a polymer was 50 mass%, and the content rate of the methyl acrylate structural unit was 50 mass%.
  • the structural formula of the cyclic organic compound C-1 is shown below.
  • optical film 7 was produced in the same manner as the optical film 1 except that the cyclic organic compound B-1 was changed to the cyclic organic compound C-2.
  • the method for synthesizing cyclic organic compound C-2 is as follows.
  • the mixed solution is washed with water to remove the catalyst, and then toluene, unreacted monomers and low molecular weight compounds are distilled off by distillation under a reduced pressure condition of 10 mmHg at a maximum temperature of 200 ° C. to obtain a polymer (cyclic organic compound).
  • C-2 was obtained.
  • the content rate of the terpene structural unit in a polymer was 90 mass%, and the content rate of the styrene structural unit was 10 mass%.
  • the structural formula of the cyclic organic compound C-2 is shown below.
  • optical film 8 An optical film 8 was prepared in the same manner as the optical film 1 except that the cyclic organic compound B-1 was changed to an organic compound C-3 (Dianal BR88, manufactured by Mitsubishi Rayon Co., Ltd.).
  • the organic compound C-3 does not have an aromatic ring structure and does not have a structure having a polar substituent in the alicyclic structure.
  • the structural formula of the organic compound C-3 is shown below.
  • optical film 9 An optical film 9 was produced in the same manner as the optical film 1 except that the cyclic organic compound B-1 was changed to a cyclic organic compound C-4 (biphenyl, manufactured by Tokyo Chemical Industry Co., Ltd.).
  • a cyclic organic compound C-4 (biphenyl, manufactured by Tokyo Chemical Industry Co., Ltd.).
  • the structural formula of the cyclic organic compound C-4 is shown below.
  • the optical film 1 was attached to one surface of the polarizing film, and a commercially available optical film KC4UZ (manufactured by Konica Minolta) was attached to the other surface of the polarizing film to produce a polarizing plate 101. More details are as follows.
  • the obtained PVA film was continuously processed in the order of pre-swelling, dyeing, uniaxial stretching by a wet method, fixing treatment, drying, and heat treatment to produce a polarizing film. That is, the PVA film was preliminarily swollen in water at a temperature of 30 ° C. for 30 seconds, and immersed in an aqueous solution having an iodine concentration of 0.4 g / liter and a potassium iodide concentration of 40 g / liter at a temperature of 35 ° C. for 3 minutes.
  • the film was uniaxially stretched 6 times in a 50% aqueous solution with a boric acid concentration of 4% under the condition that the tension applied to the film was 700 N / m, and the potassium iodide concentration was 40 g / liter and the boric acid concentration was 40 g / liter. Then, it was immersed in an aqueous solution having a zinc chloride concentration of 10 g / liter and a temperature of 30 ° C. for 5 minutes for fixing. Thereafter, the PVA film was taken out, dried with hot air at a temperature of 40 ° C., and further heat-treated at a temperature of 100 ° C. for 5 minutes. The obtained polarizing film had an average thickness of 5 ⁇ m, polarization performance of transmittance of 43.0%, polarization degree of 99.5%, and dichroic ratio of 40.1.
  • Step 1 The polarizing film described above was immersed in a storage tank of a polyvinyl alcohol adhesive solution having a solid content of 2% by mass for 1 to 2 seconds.
  • Process 2 The alkali saponification process was implemented on the following conditions with respect to the optical film 1 and KC4UZ. Next, excess adhesive adhered to the polarizing film immersed in the polyvinyl alcohol adhesive solution in Step 1 was lightly removed, and this polarizing film was sandwiched between the opposite surface of the optical film 1 from the cured layer and KC4UZ, and laminated.
  • Step 3 The above laminate was sandwiched between two rotating rollers and bonded at a pressure of 20 to 30 N / cm 2 at a speed of about 2 m / min. At this time, it was carried out with care to prevent bubbles from entering.
  • Step 4 The sample prepared in Step 3 was dried in a dryer at a temperature of 100 ° C. for 5 minutes to prepare a polarizing plate.
  • Step 5 Apply a commercially available acrylic pressure-sensitive adhesive to the protective film side of the polarizing plate prepared in Step 4 so that the thickness after drying is 5 ⁇ m, and dry in an oven at 110 ° C. for 5 minutes to form an adhesive layer. A peelable protective film was attached to the adhesive layer. This polarizing plate was cut (punched) to produce a polarizing plate 101.
  • the upper polarizing plate of the IPS mode liquid crystal display device (LGLS 42LS5600) was peeled off, and the polarizing plate 101 was attached to the liquid crystal cell as the upper polarizing plate. That is, the pressure-sensitive adhesive layer of the polarizing plate 101 and the glass of the liquid crystal cell were bonded so that KC4UZ of the polarizing plate 101 was on the liquid crystal cell side. At this time, the crossed Nicols were arranged so that the transmission axis of the upper polarizing plate (polarizing plate 101) was in the vertical direction and the transmission axis of the lower polarizing plate was in the horizontal direction.
  • Polarizing plates 102 to 109 were prepared in the same manner as the polarizing plate 101 except that the optical film 1 of the polarizing plate 101 was changed to the optical films 2 to 9, respectively.
  • Liquid crystal display devices 202 to 209 were manufactured in the same manner as the liquid crystal display device 101 except that the polarizing plate 101 was changed to the polarizing plates 102 to 109.
  • SP value measurement The SP value of the additive (cyclic organic compound) contained in the curable resin of each of the optical films 1 to 9 was calculated using FUJITSU Technical Computing Solution SCIGRESS (manufactured by Fujitsu Limited). Here, the value obtained by rounding off the second decimal place of the calculated value was defined as the SP value.
  • the single plate orthogonal transmittance measurement was performed as follows. Create two samples (approx. 5cm x 5cm) with a polarizing plate on the glass so that the KC4UZ is on the glass side, set the sample with the film side facing the light source, and measure each of the two samples And the average value was made into the single plate orthogonal transmittance
  • the measurement results were obtained by measuring the orthogonal transmittance CT at a wavelength of 410 nm and a wavelength of 510 nm ten times using UV3100PC manufactured by Shimadzu Corporation, and using the average value.
  • Table 1 shows characteristics such as SP values of additives (compounds) contained in the curable resins of the optical films 1 to 9 and the results of each evaluation.
  • the cured layer on the base material has an active energy ray-curable resin having an alicyclic structure and an SP value of 17.0 to 21.0 [(J / cm 3 ) 1/2 And a cyclic organic compound having an aromatic ring structure or a polar substituent in the alicyclic structure, wherein the cyclic organic compound is a polymer of an ethylenically unsaturated monomer. It can be seen that ⁇ 5 are excellent in the durability of the polarizer when applied to a polarizing plate, and are excellent in suppressing deterioration in visibility during black display of a liquid crystal display device.
  • the number average molecular weight of the polymer was measured by gel permeation chromatography with a light scattering detector (GPC-LALLS) at a concentration of 0.001 g / cm 3 using tetrohydrofuran (THF) as a solvent.
  • GPC-LALLS light scattering detector
  • Table 2 shows the evaluation results for the characteristics such as SP values of each optical film 4, 5, 10 and the bleed out.
  • the number average molecular weight of the cyclic organic compound contained in the cured layer is preferably 500 or more between 208 and 700, and more preferably 700 or more, from the viewpoint of suppressing bleed out. I can say that.
  • a 50/50 weight ratio mixture of styrene (manufactured by Tokyo Chemical Industry Co., Ltd.) and cyclohexane as a polymerization solvent was fed at a flow rate of 30 parts by mass / min.
  • a hexane solution of n-butyllithium was fed as an organolithium initiator to the reaction vessel in an amount corresponding to 0.8 mmol per 100 parts by mass of styrene.
  • the pressure was normal pressure, and the heat of reaction during polymerization was removed while refluxing cyclohexane in a reflux condenser.
  • the temperature of the reaction solution was almost stabilized at 81 ° C.
  • the 2nd reaction tank was passed by the plug flow continuously.
  • the anion active terminal was deactivated by adding 10 times the amount of lithium methanol to the obtained polymer solution. Thereafter, 0.05 parts by mass of an antioxidant per 100 parts by mass of the polymer was added to the polymer solution, followed by heat treatment at 215 ° C. in a reduced pressure flushing tank to remove volatile components. Further, the remaining volatile components were removed through an extruder with a vacuum vent at 215 ° C. to obtain a polymer (cyclic organic compound B-7).
  • the number average molecular weight of the polymer was measured by gel permeation chromatography with a light scattering detector (GPC-LALLS) at a concentration of 0.001 g / cm 3 using tetrohydrofuran (THF) as a solvent.
  • GPC-LALLS light scattering detector
  • ⁇ Evaluation ⁇ Evaluation of turbidity of coating solution
  • a turbidimeter (NHD2000 type, manufactured by Nippon Denshoku Industries Co., Ltd.), an optical path length of 10 mm
  • the turbidity was measured using a quartz cell and evaluated based on the following criteria.
  • Table 3 shows the evaluation results for the characteristics and turbidity of each optical film 4, 5, 11 such as SP value.
  • the number average molecular weight of the cyclic organic compound contained in the cured layer is preferably 240000 or less and more preferably 200000 or less from the viewpoint of suppressing the turbidity of the coating solution. If the number average molecular weight is less than 20000, which is a value close to 950 between 242000 and 950, the turbidity of the coating solution can be sufficiently suppressed. It is considered that the degree can be sufficiently and reliably suppressed.
  • Example 4> (Preparation of cured layer composition 2) ⁇ Preparation of polymer silane coupling agent coated fine particles>
  • a container 30 ml of methyl methacrylate (manufactured by Kyoeisha Chemical Co., Ltd .: Light Ester M), 1 ml of 3-mercaptopropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd .: KBM-803), 100 ml of tetrahydrofuran as a solvent, polymerization initiator Was added 50 mg of azoisobutyronitrile (manufactured by Kanto Chemical Co., Inc .: AIBN) and substituted with N 2 gas, followed by heating at 80 ° C. for 3 hours to prepare a polymer silane coupling agent.
  • the obtained polymer silane coupling agent had a molecular weight of 16,000. The molecular weight was measured with a gel permeation chromatography apparatus.
  • silica sol manufactured by JGC Catalysts & Chemicals Co., Ltd .: Si-45P, SiO 2 concentration 30% by weight, average particle size 45 nm, dispersion medium: water
  • silica sol manufactured by JGC Catalysts & Chemicals Co., Ltd .: Si-45P, SiO 2 concentration 30% by weight, average particle size 45 nm, dispersion medium: water
  • an ultrafiltration membrane method is used.
  • water was replaced with ethanol to prepare 100 g of an ethanol dispersion of silica fine particles (SiO 2 concentration 30 wt%).
  • silica fine particle ethanol dispersion and 1.5 g of the polymer silane coupling agent are dispersed in 20 g (25 ml) of acetone, and 20 mg of aqueous ammonia having a concentration of 29.8% by weight is added thereto, followed by stirring at room temperature for 30 hours.
  • the polymer silane coupling agent was adsorbed on the silica fine particles.
  • silica particles having an average particle diameter of 5 ⁇ m are added and stirred for 2 hours to adsorb the unadsorbed polymer silane coupling agent in the solution to the silica particles, and then the polymer silane coupling that has not been adsorbed by centrifugation.
  • Silica particles having an average particle diameter of 5 ⁇ m adsorbing the agent were removed. 1000 g of ethanol is added to the silica fine particle dispersion adsorbing the polymer silane coupling agent, and the silica fine particles are precipitated, separated, dried under reduced pressure, and then dried at 25 ° C.
  • the obtained polymer silane coupling agent-coated silica (1) had an average particle size of 57 nm. The average particle size was measured with a laser particle size measuring device.
  • the cured silane composition 2 was prepared by stirring and mixing the polymer silane coupling agent-coated silica (1) prepared above and the following compound.
  • (Fine particles) Polymer silane coupling agent-coated silica (1) 60 parts by mass (active ray curable resin) NK Ester A-DCP (Tricyclodecane dimethanol diacrylate, manufactured by Shin-Nakamura Chemical Co., Ltd.) 35 parts by mass (photopolymerization initiator) Irgacure 184 (manufactured by BASF Japan) 5 parts by mass (additive) Silicone compound (BYK-UV3510, manufactured by BYK Japan) 1 part by mass (cyclic organic compound) B-4 (YS Resin TO105, manufactured by Yasuhara Chemical Co., Ltd.) 8 parts by mass (solvent) Propylene glycol monomethyl ether 80 parts by weight Methyl acetate 20 parts by weight
  • the cured layer composition 2 prepared above is applied onto the cured layer 1 of the optical film 5 of Example 1 using a micro gravure coater, and the constant rate drying zone temperature is 50 ° C. and the reduced rate drying zone temperature is 50 ° C. After drying, while purging with nitrogen so that the oxygen concentration is 1.0% by volume or less, using an ultraviolet lamp, the illuminance of the irradiated part is 100 mW / cm 2 and the irradiation amount is 0.3 J / cm 2. The layer was cured to form a cured layer 2 having a dry film thickness of 2 ⁇ m and wound into a roll to produce an optical film 12.
  • Table 4 shows the evaluation results of the optical films 4, 5, 12, and 13 such as SP value and scratch resistance.
  • optical film, polarizing plate, and image display device of the present embodiment described above can be expressed as follows.
  • the SP value which is a solubility parameter, is in the range of 17.0 to 21.0 [(J / cm 3 ) 1/2 ], has an aromatic ring structure, or has a polar substituent in the alicyclic structure.
  • a kind of cyclic organic compound, The optical film, wherein the cyclic organic compound is a polymer of an ethylenically unsaturated monomer.
  • a polarizing plate wherein the optical film according to any one of 1 to 7 is bonded to one surface of a polarizer.
  • the optical film of the present invention can be used for image display devices such as polarizing plates and liquid crystal display devices.
  • Image display device Liquid crystal cell (display cell) 5 Polarizing plate 11 Polarizer 12 Film base material (base material) 13 Hardened layer 15 Optical film

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