WO2018190175A1 - 光学積層体、偏光板、および画像表示装置 - Google Patents

光学積層体、偏光板、および画像表示装置 Download PDF

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WO2018190175A1
WO2018190175A1 PCT/JP2018/014124 JP2018014124W WO2018190175A1 WO 2018190175 A1 WO2018190175 A1 WO 2018190175A1 JP 2018014124 W JP2018014124 W JP 2018014124W WO 2018190175 A1 WO2018190175 A1 WO 2018190175A1
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surface treatment
base film
layer
treatment layer
acrylic resin
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PCT/JP2018/014124
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English (en)
French (fr)
Japanese (ja)
Inventor
慎哉 平岡
岸　敦史
友徳 上野
佑輔 茂手木
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日東電工株式会社
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Priority to KR1020197029384A priority Critical patent/KR102510766B1/ko
Priority to JP2019512441A priority patent/JP7083814B2/ja
Priority to CN201880024181.8A priority patent/CN110520765B/zh
Publication of WO2018190175A1 publication Critical patent/WO2018190175A1/ja

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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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • 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
    • G02B1/11—Anti-reflection coatings
    • G02B1/111—Anti-reflection coatings using layers comprising organic materials
    • 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
    • G02B5/02—Diffusing elements; Afocal elements
    • 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
    • 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
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/418—Refractive
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays

Definitions

  • the present invention relates to an optical laminate, a polarizing plate, and an image display device.
  • an optical laminate in which a functional layer (surface treatment layer) such as a hard coat layer, an antiglare layer, or an antireflection layer is formed on one side of a base film made of an acrylic resin is known (Patent Document 1). ).
  • a functional layer such as a hard coat layer, an antiglare layer, or an antireflection layer
  • Such an optical laminate can be used, for example, as a protective film for a polarizer or a front plate of an image display device.
  • the conventional optical layered body as described above may not be sufficiently provided with the function of the surface treatment layer.
  • the present invention has been made in order to solve the above-described conventional problems, and the main purpose thereof is an optical laminate having a sufficient function of a surface treatment layer, a polarizing plate provided with such an optical laminate, And it is providing the image display apparatus provided with such a polarizing plate.
  • the optical layered body of the present invention includes a base film and a surface treatment layer formed on one side of the base film, and the base film is dispersed in the acrylic resin and the acrylic resin.
  • the proportion of the acrylic resin component eluted in the surface treatment layer is less than 20%.
  • the refractive index of the base film is R1
  • the refractive index at a depth of 3.0 ⁇ m in the direction of the surface treatment layer from the base film side is R3, R3> 0.2R1 + 0.8R2 (where R1 ⁇ R2) is satisfied.
  • the surface treatment layer has a thickness of 3 ⁇ m to 20 ⁇ m.
  • the base film contains 5 to 20 parts by weight of the core-shell type particles with respect to 100 parts by weight of the acrylic resin.
  • the acrylic resin has at least one selected from the group consisting of a glutarimide unit, a lactone ring unit, a maleic anhydride unit, a maleimide unit, and a glutaric anhydride unit.
  • the surface treatment layer is a cured layer of resin applied on the base film.
  • the surface treatment layer is at least one selected from the group consisting of a hard coat layer, an antiglare layer, and an antireflection layer.
  • a polarizing plate is provided.
  • the polarizing plate includes a polarizer and a protective layer disposed on one side of the polarizer, and the protective layer is the optical laminate.
  • an image display device is provided.
  • the image display device includes the polarizing plate.
  • the elastic modulus of the base film is 4.0 GPa or more, and among the components constituting the depth of 3.0 ⁇ m in the direction of the surface treatment layer from the base film side, the surface treatment layer An optical laminate in which the function of the surface treatment layer is sufficiently imparted by the eluted acrylic resin component being less than 20%, a polarizing plate provided with such an optical laminate, and such a polarizing plate Can be provided.
  • FIG. 1 is a schematic cross-sectional view of an optical laminate according to one embodiment of the present invention.
  • the optical laminate 100 includes a base film 10 and a surface treatment layer 20 formed on one side of the base film 10.
  • the base film 10 includes an acrylic resin and core-shell type particles dispersed in the acrylic resin.
  • the elastic modulus of the base film 10 is 4.0 GPa or more.
  • the ratio of the component of the acrylic resin eluted to the surface treatment layer among the components constituting the position of the depth of 3.0 ⁇ m in the direction of the surface treatment layer from the base film side is less than 20%.
  • the position at a depth of 3.0 ⁇ m in the direction of the surface treatment layer from the base film side is typically 3.0 ⁇ m away from the interface with the surface treatment layer of the base film in the direction of the surface treatment layer. It is the position.
  • the surface treatment layer thickness (hard coat thickness) is typically derived by the following procedure.
  • a PET base material (trade name: U48-3, refractive index: 1.60) manufactured by Toray Industries, Inc. was used as the base film, and the coating layer was heated at 70 ° C. and UV cured. Then, an optical laminate having a hard coat layer formed thereon is obtained. A black acrylic plate (Mitsubishi Rayon Co., Ltd., thickness 2 mm) was attached to the base layer side of the obtained optical laminate through an acrylic adhesive having a thickness of 20 ⁇ m. Next, the reflection spectrum of the hard coat layer is measured under the following conditions using an instantaneous multi-photometry system (trade name: MCPD3700, manufactured by Otsuka Electronics Co., Ltd.).
  • an instantaneous multi-photometry system (trade name: MCPD3700, manufactured by Otsuka Electronics Co., Ltd.).
  • the thickness of only the hard coat layer is measured from the peak position of the FFT spectrum obtained from the laminate.
  • Reflection spectrum measurement conditions Reference: Mirror Algorithm: FFT method Calculation wavelength: 450 nm to 850 nm ⁇ Detection conditions Exposure time: 20 ms Lamp gain: Normal Integration count: 10 times / FFT method Film thickness range: 2 to 15 ⁇ m Film thickness resolution: 24nm
  • the function of the surface treatment layer (typically scratch resistance when the surface treatment layer is a hard coat layer) may not be sufficiently provided, and the base film and the surface Adhesiveness with a processing layer may fall.
  • the proportion of the acrylic resin component eluted in the surface treatment layer out of the components constituting the depth of 3.0 ⁇ m in the direction of the surface treatment layer 20 from the base film 10 side is measured by, for example, the prism coupler method. be able to.
  • the refractive index of the base film is R1
  • the refractive index of the surface treatment layer is R2
  • a depth of 3.0 ⁇ m from the base film side measured by the prism coupler method to the surface treatment layer is measured by the prism coupler method to the surface treatment layer.
  • the optical laminate 100 has a refractive index R1 of the base film, a refractive index R2 of the surface treatment layer, and a refractive index R3 at a depth of 3.0 ⁇ m from the base film side to the surface treatment layer.
  • the following inequality is satisfied.
  • the thickness of the surface treatment layer is preferably 3 ⁇ m to 20 ⁇ m, more preferably 5 ⁇ m to 15 ⁇ m.
  • the base film 10 preferably contains 5 to 20 parts by weight of core-shell type particles with respect to 100 parts by weight of the acrylic resin.
  • the acrylic resin preferably has at least one selected from the group consisting of a glutarimide unit, a lactone ring unit, a maleic anhydride unit, a maleimide unit, and a glutaric anhydride unit.
  • the surface treatment layer 20 is typically a cured layer of a resin composition applied on the base film 10.
  • the surface treatment layer 20 is preferably at least one selected from the group consisting of a hard coat layer, an antiglare layer, and an antireflection layer.
  • the amount of the acrylic resin contained in the base film 10 to the surface treatment layer 20 is sufficiently small. Thereby, the fall of the functionality of a surface treatment layer by the acrylic resin eluting to the surface treatment layer 20 can be suppressed.
  • the surface treatment layer is a hard coat layer
  • a decrease in scratch resistance of the hard coat layer can be suppressed
  • the antiglare layer can be prevented.
  • a decrease in glare can be suppressed, and when the surface treatment layer is an antireflection layer, a decrease in antireflection properties of the antireflection layer can be suppressed. Further, the adhesion between the base film 10 and the surface treatment layer 20 can be improved.
  • the base film includes an acrylic resin and core-shell type particles dispersed in the acrylic resin as described above.
  • the thickness of the base film is preferably 5 ⁇ m to 150 ⁇ m, more preferably 10 ⁇ m to 100 ⁇ m.
  • the elastic modulus of the base film is 4.0 GPa or more.
  • the acrylic resin can be eluted into the surface treatment layer.
  • the ratio of the component of the acrylic resin is less than 20% among the components constituting the position having a depth of 3.0 ⁇ m in the direction of the surface treatment layer from the base film side.
  • the base film preferably has substantially optical isotropy.
  • substantially optically isotropic means that the in-plane retardation Re (550) is 0 nm to 10 nm and the thickness direction retardation Rth (550) is ⁇ 10 nm to +10 nm. Say something.
  • the in-plane retardation Re (550) is more preferably 0 nm to 5 nm, further preferably 0 nm to 3 nm, and particularly preferably 0 nm to 2 nm.
  • Thickness direction retardation Rth (550) is more preferably ⁇ 5 nm to +5 nm, further preferably ⁇ 3 nm to +3 nm, and particularly preferably ⁇ 2 nm to +2 nm.
  • Re (550) and Rth (550) of the base film are within such ranges, adverse effects on display characteristics can be prevented when the optical laminate is applied to an image display device.
  • Rth (550) is a retardation in the thickness direction of the film measured with light having a wavelength of 550 nm at 23 ° C.
  • nx is the refractive index in the direction in which the in-plane refractive index is maximum (that is, the slow axis direction)
  • ny is in the direction orthogonal to the slow axis in the plane (that is, the fast axis direction).
  • nz is the refractive index in the thickness direction
  • d is the thickness (nm) of the film.
  • the light transmittance at 380 nm when the thickness of the substrate film is 40 ⁇ m is preferably as high as possible. Specifically, the light transmittance is preferably 85% or more, more preferably 88% or more, and further preferably 90% or more. If the light transmittance is within such a range, desired transparency can be ensured.
  • the light transmittance can be measured, for example, by a method according to ASTM-D-1003.
  • the haze is preferably 5% or less, more preferably 3% or less, still more preferably 1.5% or less, and particularly preferably 1% or less.
  • the film can have a good clear feeling.
  • the optical layered body is used as a protective layer for the viewing-side polarizing plate of the image display device, the display content can be visually recognized well.
  • YI at a thickness of 40 ⁇ m of the base film is preferably 1.27 or less, more preferably 1.25 or less, further preferably 1.23 or less, and particularly preferably 1.20 or less. If YI exceeds 1.3, the optical transparency may be insufficient.
  • the b value (scale of hue according to Hunter's color system) at a thickness of 40 ⁇ m of the substrate film is preferably less than 1.5, more preferably 1.0 or less. If the b value is 1.5 or more, an undesired color may appear.
  • the b value is obtained by, for example, cutting a base film sample into a 3 cm square and measuring the hue using a high-speed integrating sphere type spectral transmittance measuring machine (trade name DOT-3C: manufactured by Murakami Color Research Laboratory). It can be obtained by evaluating the hue according to Hunter's color system.
  • the moisture permeability of the base film is preferably 300 g / m 2 ⁇ 24 hr or less, more preferably 250 g / m 2 ⁇ 24 hr or less, still more preferably 200 g / m 2 ⁇ 24 hr or less, particularly preferably 150 g / m 2 ⁇ 24 hr or less. And most preferably 100 g / m 2 ⁇ 24 hr or less.
  • a polarizing plate excellent in durability and moisture resistance can be obtained when used as a protective layer for a polarizer.
  • the tensile strength of the base film is preferably 10 MPa or more and less than 100 MPa, more preferably 30 MPa or more and less than 100 MPa. If it is less than 10 MPa, sufficient mechanical strength may not be exhibited. If it exceeds 100 MPa, the workability may be insufficient.
  • the tensile strength can be measured according to, for example, ASTM-D-882-61T.
  • the tensile elongation of the base film is preferably 1.0% or more, more preferably 3.0% or more, and further preferably 5.0% or more.
  • the upper limit of tensile elongation is, for example, 100%. If the tensile elongation is less than 1%, the toughness may be insufficient.
  • the tensile elongation can be measured according to, for example, ASTM-D-882-61T.
  • the tensile elastic modulus of the base film is 4 GPa or more, preferably 4.5 GPa or more.
  • the upper limit of the tensile modulus is, for example, 20 GPa.
  • the tensile elastic modulus can be measured, for example, according to ASTM-D-882-61T.
  • the base film may contain any appropriate additive depending on the purpose.
  • additives include ultraviolet absorbers; hindered phenol-based, phosphorus-based, sulfur-based and other antioxidants; light-resistant stabilizers, weather-resistant stabilizers, heat stabilizers and other stabilizers; glass fibers, carbon fibers, etc.
  • Near-infrared absorbers include flame retardants such as tris (dibromopropyl) phosphate, triallyl phosphate and antimony oxide; antistatic agents such as anionic, cationic and nonionic surfactants; inorganic pigments and organic pigments And coloring agents such as dyes; organic fillers or inorganic fillers; resin modifiers; organic fillers and inorganic fillers; plasticizers;
  • An additive may be added at the time of superposition
  • the type, number, combination, addition amount, and the like of the additive can be appropriately set according to the purpose.
  • the acrylic resin typically contains alkyl (meth) acrylate as a main component as a monomer unit.
  • (meth) acryl means acrylic and / or methacrylic.
  • alkyl (meth) acrylate constituting the main skeleton of the acrylic resin include linear or branched alkyl groups having 1 to 18 carbon atoms. These can be used alone or in combination.
  • any appropriate copolymerization monomer may be introduced into the acrylic resin by copolymerization. The type, number, copolymerization ratio, and the like of such copolymerization monomers can be appropriately set according to the purpose.
  • the constituent components (monomer units) of the main skeleton of the acrylic resin will be described later with reference to the general formula (2).
  • the acrylic resin preferably has at least one selected from a glutarimide unit, a lactone ring unit, a maleic anhydride unit, a maleimide unit and a glutaric anhydride unit.
  • An acrylic resin having a lactone ring unit is described in, for example, Japanese Patent Application Laid-Open No. 2008-181078, and the description of the publication is incorporated herein by reference.
  • the glutarimide unit is preferably represented by the following general formula (1):
  • R 1 and R 2 each independently represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms
  • R 3 represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, carbon
  • a cycloalkyl group having 3 to 12 carbon atoms or an aryl group having 6 to 10 carbon atoms is shown.
  • R 1 and R 2 are each independently a hydrogen atom or a methyl group
  • R 3 is a hydrogen atom, a methyl group, a butyl group, or a cyclohexyl group. More preferably, R 1 is a methyl group, R 2 is a hydrogen atom, and R 3 is a methyl group.
  • R 4 represents a hydrogen atom or a methyl group
  • R 5 represents a hydrogen atom or an optionally substituted aliphatic or alicyclic hydrocarbon group having 1 to 6 carbon atoms. Show.
  • the substituent include halogen and hydroxyl group.
  • Specific examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, and t- (meth) acrylate.
  • R 5 is preferably a hydrogen atom or a methyl group. Accordingly, particularly preferred alkyl (meth) acrylates are methyl acrylate or methyl methacrylate.
  • the acrylic resin may contain only a single glutarimide unit, or may contain a plurality of glutarimide units in which R 1 , R 2 and R 3 in the general formula (1) are different.
  • the content ratio of the glutarimide unit in the acrylic resin is preferably 2 mol% to 50 mol%, more preferably 2 mol% to 45 mol%, still more preferably 2 mol% to 40 mol%, and particularly preferably 2 mol%. % To 35 mol%, most preferably 3 mol% to 30 mol%.
  • the content ratio is less than 2 mol%, the effects expressed from the glutarimide unit (for example, high optical characteristics, high mechanical strength, excellent adhesiveness with a polarizer, thinning) are sufficiently exerted. There is a risk that it will not be.
  • the content ratio exceeds 50 mol%, for example, heat resistance and transparency may be insufficient.
  • the acrylic resin may include only a single alkyl (meth) acrylate unit, or may include a plurality of alkyl (meth) acrylate units in which R 4 and R 5 in the general formula (2) are different. Also good.
  • the content ratio of the alkyl (meth) acrylate unit in the acrylic resin is preferably 50 mol% to 98 mol%, more preferably 55 mol% to 98 mol%, still more preferably 60 mol% to 98 mol%, particularly preferably. Is from 65 mol% to 98 mol%, most preferably from 70 mol% to 97 mol%. If the content ratio is less than 50 mol%, the effects expressed from the alkyl (meth) acrylate unit (for example, high heat resistance and high transparency) may not be sufficiently exhibited. If the content is more than 98 mol%, the resin is brittle and easily cracked, and high mechanical strength cannot be exhibited sufficiently, which may result in poor productivity.
  • the acrylic resin may contain units other than glutarimide units and alkyl (meth) acrylate units.
  • the acrylic resin can contain, for example, 0 to 10% by weight of an unsaturated carboxylic acid unit that is not involved in the intramolecular imidation reaction described later.
  • the content ratio of the unsaturated carboxylic acid unit is preferably 0 to 5% by weight, more preferably 0 to 1% by weight. When the content is in such a range, transparency, retention stability and moisture resistance can be maintained.
  • the acrylic resin may contain copolymerizable vinyl monomer units (other vinyl monomer units) other than those described above.
  • vinyl monomers include acrylonitrile, methacrylonitrile, ethacrylonitrile, allyl glycidyl ether, maleic anhydride, itaconic anhydride, N-methylmaleimide, N-ethylmaleimide, N-cyclohexylmaleimide, acrylic Aminoethyl acid, propylaminoethyl acrylate, dimethylaminoethyl methacrylate, ethylaminopropyl methacrylate, cyclohexylaminoethyl methacrylate, N-vinyldiethylamine, N-acetylvinylamine, allylamine, methallylamine, N-methylallylamine, 2 -Isopropenyl-oxazoline, 2-vinyl-oxazoline, 2-acryloy
  • Styrene monomers such as styrene and ⁇ -methylstyrene are preferable.
  • the content of other vinyl monomer units is preferably 0 to 1% by weight, more preferably 0 to 0.1% by weight. If it is such a range, the expression of the phase difference and the fall of transparency which are not desired can be suppressed.
  • the imidization ratio in the acrylic resin is preferably 2.5% to 20.0%. If the imidation ratio is in such a range, a resin excellent in heat resistance, transparency and molding processability can be obtained, and the occurrence of kogation and a decrease in mechanical strength during film molding can be prevented.
  • the imidization rate is represented by a ratio of a glutarimide unit and an alkyl (meth) acrylate unit. This ratio can be obtained from, for example, the NMR spectrum, IR spectrum, etc. of the acrylic resin.
  • the imidization ratio can be determined by 1 H-NMR measurement of the resin using 1 H NMR BRUKER Avance III (400 MHz).
  • the peak area derived from the O—CH 3 proton of alkyl (meth) acrylate in the vicinity of 3.5 to 3.8 ppm is defined as A, and N—CH 3 of glutarimide in the vicinity of 3.0 to 3.3 ppm.
  • the acid value of the acrylic resin is preferably 0.10 mmol / g to 0.50 mmol / g. If the acid value is within such a range, a resin having a good balance of heat resistance, mechanical properties and molding processability can be obtained. If the acid value is too small, there may be problems such as an increase in cost due to the use of a modifier for adjusting to a desired acid value, and generation of a gel-like material due to the remaining modifier. When the acid value is too large, foaming at the time of film forming (for example, at the time of melt extrusion) tends to occur, and the productivity of the molded product tends to decrease.
  • the acid value is the content of carboxylic acid units and carboxylic anhydride units in the acrylic resin. In the present embodiment, the acid value can be calculated by, for example, a titration method described in WO2005 / 054311 or JP-A-2005-23272.
  • the weight average molecular weight of the acrylic resin is preferably 1,000 to 2,000,000, more preferably 5,000 to 1,000,000, still more preferably 10,000 to 500,000, particularly preferably 50,000 to 500,000, and most preferably 60000 to 150,000.
  • a weight average molecular weight can be calculated
  • the acrylic resin has a Tg (glass transition temperature) of preferably 110 ° C. or higher, more preferably 115 ° C. or higher, further preferably 120 ° C. or higher, particularly preferably 125 ° C. or higher, and most preferably 130 ° C. or higher. If Tg is 110 degreeC or more, the polarizing plate containing the base film obtained from such resin will become easily excellent in durability.
  • the upper limit value of Tg is preferably 300 ° C. or lower, more preferably 290 ° C. or lower, further preferably 285 ° C. or lower, particularly preferably 200 ° C. or lower, and most preferably 160 ° C. or lower. If Tg is in such a range, the moldability can be excellent.
  • the acrylic resin can be produced, for example, by the following method. This method comprises (I) an alkyl (meth) acrylate monomer corresponding to the alkyl (meth) acrylate unit represented by the general formula (2), an unsaturated carboxylic acid monomer and / or a precursor thereof To obtain a copolymer (a); and (II) treating the copolymer (a) with an imidizing agent to give a copolymer (a) in the copolymer (a).
  • An intramolecular imidation reaction of the alkyl (meth) acrylate monomer unit and the unsaturated carboxylic acid monomer and / or its precursor monomer unit is carried out to share the glutarimide unit represented by the general formula (1). Introducing into the polymer.
  • Examples of the unsaturated carboxylic acid monomer include acrylic acid, methacrylic acid, crotonic acid, ⁇ -substituted acrylic acid, and ⁇ -substituted methacrylic acid.
  • Examples of the precursor monomer include acrylamide and methacrylamide. These may be used alone or in combination.
  • a preferred unsaturated carboxylic acid monomer is acrylic acid or methacrylic acid, and a preferred precursor monomer is acrylamide.
  • Any appropriate method can be used as a method for treating the copolymer (a) with an imidizing agent.
  • Specific examples include a method using an extruder and a method using a batch type reaction vessel (pressure vessel).
  • the method using an extruder includes heating and melting the copolymer (a) using an extruder and treating it with an imidizing agent.
  • any appropriate extruder can be used as the extruder.
  • Specific examples include a single screw extruder, a twin screw extruder, and a multi-screw extruder.
  • any appropriate batch type reaction vessel pressure vessel can be used.
  • the imidizing agent any appropriate compound can be used as long as the glutarimide unit represented by the general formula (1) can be generated.
  • Specific examples of the imidizing agent include amines containing aliphatic hydrocarbon groups such as methylamine, ethylamine, n-propylamine, i-propylamine, n-butylamine, i-butylamine, tert-butylamine, n-hexylamine, Examples include aromatic hydrocarbon group-containing amines such as aniline, benzylamine, toluidine, and trichloroaniline, and alicyclic hydrocarbon group-containing amines such as cyclohexylamine.
  • a urea compound that generates such an amine by heating can be used.
  • the urea compound include urea, 1,3-dimethylurea, 1,3-diethylurea, and 1,3-dipropylurea.
  • the imidizing agent is preferably methylamine, ammonia, or cyclohexylamine, more preferably methylamine.
  • a ring closure accelerator may be added as necessary.
  • the amount of the imidizing agent used in the imidization is preferably 0.5 to 10 parts by weight, more preferably 0.5 to 6 parts by weight with respect to 100 parts by weight of the copolymer (a). It is. If the amount of the imidizing agent used is less than 0.5 parts by weight, the desired imidization rate is often not achieved. As a result, the heat resistance of the resulting resin becomes extremely insufficient, which may induce appearance defects such as burnt after molding. When the amount of the imidizing agent used exceeds 10 parts by weight, the imidizing agent remains in the resin, and the imidizing agent may induce appearance defects such as burnt after molding and foaming.
  • the production method of the present embodiment can include treatment with an esterifying agent in addition to the imidization as necessary.
  • esterifying agent examples include dimethyl carbonate, 2,2-dimethoxypropane, dimethyl sulfoxide, triethyl orthoformate, trimethyl orthoacetate, trimethyl orthoformate, diphenyl carbonate, dimethyl sulfate, methyl toluene sulfonate, methyl trifluoromethane sulfonate, Methyl acetate, methanol, ethanol, methyl isocyanate, p-chlorophenyl isocyanate, dimethylcarbodiimide, dimethyl-t-butylsilyl chloride, isopropenyl acetate, dimethylurea, tetramethylammonium hydroxide, dimethyldiethoxysilane, tetra-N-butoxysilane , Dimethyl (trimethylsilane) phosphite, trimethyl phosphite , Trimethyl phosphate, tricresyl phosphate, diazomethane, ethylene oxide
  • the addition amount of the esterifying agent can be set so that the acid value of the acrylic resin becomes a desired value.
  • the acrylic resin and other resins may be used in combination. That is, a monomer component constituting an acrylic resin and a monomer component constituting another resin may be copolymerized, and the copolymer may be used for film formation described later in Section B-4; A blend with the resin may be used for film formation.
  • resins include, for example, styrene resins, polyethylene, polypropylene, polyamide, polyphenylene sulfide, polyether ether ketone, polyester, polysulfone, polyphenylene oxide, polyacetal, polyimide, polyetherimide, and other thermoplastic resins, phenolic Examples thereof include thermosetting resins such as resins, melamine resins, polyester resins, silicone resins, and epoxy resins.
  • the type and blending amount of the resin to be used in combination can be appropriately set according to the purpose and the properties desired for the obtained film.
  • a styrene resin preferably, acrylonitrile-styrene copolymer
  • phase difference controlling agent preferably, acrylonitrile-styrene copolymer
  • the content of the acrylic resin in the blend of the acrylic resin and the other resin is preferably 50% by weight to 100% by weight, more preferably 60% by weight to 100%. % By weight, more preferably 70% by weight to 100% by weight, particularly preferably 80% by weight to 100% by weight. When the content is less than 50% by weight, the high heat resistance and high transparency inherent in the acrylic resin may not be sufficiently reflected.
  • the core-shell type particles are preferably blended in an amount of 5 to 20 parts by weight, more preferably 5 to 13 parts by weight with respect to 100 parts by weight of the acrylic resin.
  • the core-shell type particles typically have a core made of a rubber-like polymer and a coating layer made of a glassy polymer and covering the core.
  • the core-shell type particle may have one or more layers made of a glassy polymer as the innermost layer or the intermediate layer.
  • the Tg of the rubbery polymer constituting the core is preferably 20 ° C. or less, more preferably ⁇ 60 ° C. to 20 ° C., and further preferably ⁇ 60 ° C. to 10 ° C. If the Tg of the rubbery polymer constituting the core exceeds 20 ° C, the mechanical strength of the acrylic resin may not be sufficiently improved.
  • the Tg of the glassy polymer (hard polymer) constituting the coating layer is preferably 50 ° C. or higher, more preferably 50 ° C. to 140 ° C., and further preferably 60 ° C. to 130 ° C. When Tg of the glassy polymer constituting the coating layer is lower than 50 ° C., the heat resistance of the acrylic resin may be lowered.
  • the core content in the core-shell type particles is preferably 30% to 95% by weight, more preferably 50% to 90% by weight.
  • the ratio of the glassy polymer layer in the core is 0 to 60% by weight, preferably 0 to 45% by weight, and more preferably 10 to 40% by weight with respect to 100% by weight of the total amount of the core.
  • the content of the coating layer in the core-shell type particle is preferably 5% by weight to 70% by weight, more preferably 10% by weight to 50% by weight.
  • the core-shell particles dispersed in the acrylic resin may have a flat shape.
  • the core-shell type particles can be flattened by stretching described later in Section B-4.
  • the length / thickness ratio of the flattened core-shell type particles is 7.0 or less.
  • the length / thickness ratio is preferably 6.5 or less, and more preferably 6.3 or less.
  • the length / thickness ratio is preferably 4.0 or more, more preferably 4.5 or more, and further preferably 5.0 or more.
  • the “ratio of length / thickness” means the ratio of the representative length and thickness of the core-shell type particle in plan view.
  • the “representative length” means a diameter when the shape in plan view is circular, a long diameter when the shape is elliptical, and a diagonal length when the shape is rectangular or polygonal.
  • the ratio can be obtained, for example, by the following procedure. The cross section of the obtained film was photographed with a transmission electron microscope (for example, acceleration voltage 80 kV, RuO 4 dyeing ultrathin section method), and the long core-shell type particles present in the obtained photograph (cross section close to the representative length) The ratio can be obtained by extracting 30 pieces in order from the one obtained and calculating (average length) / (average thickness).
  • a base film according to an embodiment of the present invention typically includes the above acrylic resin (in the case of using another resin in combination, a blend with the other resin) and core-shell type particles. It can be formed by a method comprising filming the composition. Further, the method of forming the base film can include stretching the film.
  • the average particle diameter of the core-shell type particles used for film formation is preferably 1 nm to 500 nm.
  • the average particle diameter of the core is preferably 50 nm to 300 nm, more preferably 70 nm to 300 nm.
  • Arbitrary appropriate methods can be employ
  • Specific examples include cast coating methods (for example, casting methods), extrusion molding methods, injection molding methods, compression molding methods, transfer molding methods, blow molding methods, powder molding methods, FRP molding methods, calendar molding methods, and hot presses. Law.
  • the extrusion molding method or the cast coating method is preferable. This is because the smoothness of the resulting film can be improved and good optical uniformity can be obtained.
  • Particularly preferred is an extrusion method. This is because it is not necessary to consider the problem due to the residual solvent. Among these, an extrusion method using a T die is preferable from the viewpoint of film productivity and ease of subsequent stretching treatment.
  • the molding conditions can be appropriately set according to the composition and type of the resin used, the properties desired for the resulting film, and the like.
  • any appropriate stretching method and stretching conditions for example, stretching temperature, stretching ratio, stretching speed, stretching direction
  • the stretching method include free end stretching, fixed end stretching, free end contraction, and fixed end contraction. These may be used alone, may be used simultaneously, or may be used sequentially.
  • the stretching direction can be an appropriate direction depending on the purpose. Specifically, a length direction, a width direction, a thickness direction, and an oblique direction are mentioned.
  • the stretching direction may be one direction (uniaxial stretching), two directions (biaxial stretching), or three or more directions. In the embodiment of the present invention, typically, uniaxial stretching in the length direction, simultaneous biaxial stretching in the length direction and width direction, and sequential biaxial stretching in the length direction and width direction may be employed. Biaxial stretching (simultaneous or sequential) is preferable. This is because the in-plane phase difference can be easily controlled and optical isotropy can be easily realized.
  • Stretching temperature is the optical properties, mechanical properties and thickness desired for the base film, type of resin used, film thickness used, stretching method (uniaxial stretching or biaxial stretching), stretch ratio, stretch It can vary depending on speed and the like.
  • the stretching temperature is preferably Tg to Tg + 50 ° C., more preferably Tg + 15 ° C. to Tg + 50 ° C., and most preferably Tg + 35 ° C. to Tg + 50 ° C.
  • stretching at such temperature the base film which has a suitable characteristic may be obtained.
  • the specific stretching temperature is, for example, 110 ° C. to 200 ° C., preferably 120 ° C. to 190 ° C.
  • the stretching temperature is in such a range
  • a base film having a desired elastic modulus and suppressing elution of the acrylic resin into the surface treatment layer is obtained. Can be obtained.
  • a decrease in functionality of the surface treatment layer when the surface treatment layer is formed on the base film can be suppressed, and the adhesion between the base film and the surface treatment layer can be improved.
  • the stretching ratio is also the same as the stretching temperature: optical properties, mechanical properties and thickness, type of resin used, film thickness used, stretching method (uniaxial stretching or biaxial stretching), stretching temperature, stretching It can vary depending on speed and the like.
  • the ratio (TD / MD) of the stretching ratio in the width direction (TD) and the stretching ratio in the length direction (MD) is preferably 1.0 to 1.5, more preferably Is 1.0 to 1.4, more preferably 1.0 to 1.3.
  • the plane magnification (product of the draw ratio in the length direction and the draw ratio in the width direction) when employing biaxial stretching is preferably 2.0 to 6.0, more preferably 3.0 to 5.5, and more preferably 3.5 to 5.2.
  • Stretching speed is also the same as stretching temperature: optical properties, mechanical properties and thickness, type of resin used, film thickness used, stretching method (uniaxial stretching or biaxial stretching), stretching temperature, stretching It can change depending on the magnification or the like.
  • the stretching speed is preferably 3% / second to 20% / second, more preferably 3% / second to 15% / second, and further preferably 3% / second to 10% / second.
  • biaxial stretching is employed, the stretching speed in one direction and the stretching speed in the other direction may be the same or different. If the stretching speed is in such a range, by appropriately adjusting the stretching temperature and the stretching ratio, a base film having a desired elastic modulus and suppressing elution of the acrylic resin into the surface treatment layer is obtained. Can be obtained. As a result, a decrease in functionality of the surface treatment layer when the surface treatment layer is formed on the base film can be suppressed, and the adhesion between the base film and the surface treatment layer can be improved.
  • the base film can be formed.
  • the surface treatment layer is any suitable functional layer formed on one side of the base film according to the function required for the optical laminate.
  • Specific examples of the surface treatment layer include a hard coat layer, an antiglare layer, and an antireflection layer.
  • the thickness of the surface treatment layer is preferably 3 ⁇ m to 20 ⁇ m, more preferably 5 ⁇ m to 15 ⁇ m.
  • the surface treatment layer is typically a cured layer of the resin composition formed on the base film.
  • the step of forming the surface treatment layer includes forming a coating layer by applying a resin composition for forming the surface treatment layer on the base film, and drying and curing the coating layer to form a surface treatment layer. Can be included. Drying and curing the coating layer can include heating the coating layer.
  • the resin composition preferably contains a solvent for dilution.
  • the heating temperature of the coating layer can be set to any appropriate temperature according to the composition of the resin composition, and is preferably set to be equal to or lower than the glass transition temperature of the acrylic resin contained in the base film. If heating is performed at a temperature not higher than the glass transition temperature of the acrylic resin contained in the base film, an optical laminate in which deformation due to heating is suppressed can be obtained.
  • the heating temperature of the coating layer is, for example, 50 ° C. to 140 ° C., preferably 60 ° C. to 100 ° C. By heating at such a heating temperature, an optical laminate excellent in adhesion between the base film and the surface treatment layer can be obtained.
  • the hard coat layer is a layer that imparts scratch resistance, chemical resistance, and the like to the surface of the substrate film.
  • the hard coat layer preferably has a hardness of H or higher, more preferably 3H or higher, in a pencil hardness test.
  • the pencil hardness test can be measured according to JIS K 5400.
  • the resin composition for forming the hard coat layer may contain, for example, a curable compound that can be cured by heat, light (such as ultraviolet rays), or an electron beam. Details of the hard coat layer and the resin composition for forming the hard coat layer are described in, for example, JP-A-2014-240955. This publication is incorporated herein by reference in its entirety.
  • the antiglare layer is a layer for preventing reflection of external light by scattering and reflecting light.
  • the resin composition for forming an antiglare layer can contain, for example, a curable compound that can be cured by heat, light (such as ultraviolet rays), or an electron beam.
  • the antiglare layer typically has a fine uneven shape on the surface. Examples of a method for forming such a fine concavo-convex shape include a method in which fine particles are contained in the curable compound. Details of the antiglare layer and the resin composition for forming the antiglare layer are described in, for example, JP-A-2017-32711. This publication is incorporated herein by reference in its entirety.
  • the antireflection layer is a layer for preventing reflection of external light.
  • the resin composition for forming the antireflection layer can contain, for example, a curable compound that can be cured by heat, light (such as ultraviolet rays), or an electron beam.
  • the antireflection layer may be a single layer composed of only one layer or a plurality of layers composed of two or more layers. Details of the antireflection layer and the resin composition for forming the antireflection layer are described in, for example, JP-A-2012-155050. This publication is incorporated herein by reference in its entirety.
  • the present invention also includes a polarizing plate using such an optical laminate.
  • the polarizing plate has a polarizer and the optical laminate of the present invention disposed on one side of the polarizer.
  • the optical layered body can be bonded to the polarizer on the base film side and function as a protective layer for the polarizer.
  • the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
  • polarizers composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and ethylene / vinyl acetate copolymer partially saponified films.
  • PVA polyvinyl alcohol
  • polyene-based oriented films such as those subjected to dyeing treatment and stretching treatment with dichroic substances such as iodine and dichroic dyes, PVA dehydrated products and polyvinyl chloride dehydrochlorinated products.
  • a polarizer obtained by dyeing a PVA film with iodine and uniaxially stretching is used because of excellent optical properties.
  • the dyeing with iodine is performed, for example, by immersing a PVA film in an aqueous iodine solution.
  • the stretching ratio of the uniaxial stretching is preferably 3 to 7 times.
  • the stretching may be performed after the dyeing treatment or may be performed while dyeing. Moreover, you may dye
  • the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing the PVA film in water and washing it before dyeing, not only can the surface of the PVA film be cleaned of dirt and anti-blocking agents, but the PVA film can be swollen to cause uneven staining. Can be prevented.
  • a polarizer obtained by using a laminate a laminate of a resin substrate and a PVA resin layer (PVA resin film) laminated on the resin substrate, or a resin substrate and the resin
  • a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate examples thereof include a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate.
  • a polarizer obtained by using a laminate of a resin base material and a PVA resin layer applied and formed on the resin base material may be obtained by, for example, applying a PVA resin solution to a resin base material and drying it.
  • a PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; the laminate is stretched and dyed to make the PVA-based resin layer a polarizer; obtain.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching.
  • the stretching may further include, if necessary, stretching the laminate in the air at a high temperature (for example, 95 ° C. or higher) before stretching in the aqueous boric acid solution.
  • the obtained resin base material / polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), and the resin base material is peeled from the resin base material / polarizer laminate.
  • Any appropriate protective layer according to the purpose may be laminated on the release surface. Details of a method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. This publication is incorporated herein by reference in its entirety.
  • the thickness of the polarizer is, for example, 1 ⁇ m to 80 ⁇ m. In one embodiment, the thickness of the polarizer is preferably 2 ⁇ m to 30 ⁇ m, more preferably 3 ⁇ m to 25 ⁇ m.
  • the polarizing plate described in the above section D can be applied to an image display device. Therefore, the present invention also includes an image display device using such a polarizing plate.
  • Typical examples of the image display device include a liquid crystal display device and an organic electroluminescence (EL) display device. Since the image display apparatus employs a configuration well known in the industry, detailed description thereof is omitted.
  • Measurement condition light source 594 nm Mode: TE Scan: 300 to -300 (1-1) Refractive index R1 of base film Measurement type: Bulk / Substrate The mode (called Knee) was detected by measuring the substrate film. The refractive index obtained by the measurement was R1. (1-2) Refractive index R2 of the surface treatment layer Measurement type: Single Film (Prism Couple) Except that a PET substrate (trade name: U48-3, refractive index: 1.60) manufactured by Toray Industries, Inc. was used as the substrate film, and the heating temperature of the coating layer was set to 60 ° C. The laminated body of the same thickness as each Example was obtained. A plurality of modes were detected by measuring this laminate in a single film mode.
  • the refractive index obtained by the measurement was R2.
  • Measurement type Single Film (Prism Couple) Analysis method: Index gradient
  • the refractive index change in the depth direction can be quantitatively determined by the method using the prism coupler.
  • a plurality of modes were detected by measuring the optical laminate, and the refractive index change in the depth direction was calculated by Index gradient analysis. “Position of 3.0 ⁇ m depth” in the direction of the surface treatment layer from the base film side was determined based on the following formula, and the obtained refractive index was R3.
  • X (%) (R3-R2) ⁇ 100 / (R1-R2) (2) Elastic modulus of base film
  • TI900 TriboIndenter manufactured by Hystron
  • the base film was cut into a size of 10 mm ⁇ 10 mm, fixed to a support with TriboIndenter, and the compression elastic modulus was measured by the nanoindentation method. At that time, the position was adjusted so that the used indenter pushed in the vicinity of the center of the transparent layer. The measurement conditions are shown below.
  • the obtained imidized MS resin is represented by a general formula (1), a glutarimide unit (R 1 and R 3 are methyl groups, R 2 is a hydrogen atom), and a general formula (2) ( It had a (meth) acrylic acid ester unit (R 4 and R 5 are methyl groups), and a styrene unit.
  • a meshing type co-rotating twin screw extruder having a diameter of 15 mm was used.
  • the set temperature of each temperature control zone of the extruder is 230 ° C.
  • the screw rotation speed is 150 rpm
  • MS resin is supplied at 2.0 kg / hr
  • the supply amount of monomethylamine is 2 parts by weight with respect to 100 parts by weight of MS resin.
  • MS resin was introduced from the hopper, and the resin was melted and filled with a kneading block, and then monomethylamine was injected from the nozzle. A seal ring was placed at the end of the reaction zone to fill the resin.
  • the by-product after reaction and excess methylamine were devolatilized by reducing the pressure at the vent port to -0.08 MPa.
  • the resin that came out as a strand from a die provided at the exit of the extruder was cooled in a water tank and then pelletized with a pelletizer.
  • the imidization rate of the obtained imidized MS resin was 5.0%, and the acid value was 0.5 mmol / g. 100 parts by weight of the imidized MS resin obtained above and 5 parts by weight of core-shell type particles were put into a single-screw extruder, melt mixed, and a film was formed through a T die to obtain an extruded film.
  • the obtained extruded film was simultaneously biaxially stretched twice in the length direction and the width direction at a stretching temperature of 140 ° C.
  • the stretching speed was 10% / second in both the length direction and the width direction.
  • a substrate film A having a thickness of 30 ⁇ m was produced.
  • Example 2 Production of Base Film A base film B was produced in the same manner as in Example 1, except that the amount of the core-shell type particles was 10 parts by weight, and the stretching temperature of the extruded film was 150 ° C. 2. Production of Optical Laminate An optical laminate 2 having a hard coat layer formed on one side of the substrate film B was obtained in the same manner as in Example 1 except that the substrate film B was used. The said optical laminated body 2 was used for each evaluation. The results are shown in Table 1.
  • Example 3 Production of Base Film A base film C was produced in the same manner as in Example 1 except that the amount of the core-shell type particles was 10 parts by weight and the stretch temperature of the extruded film was 160 ° C. 2. Production of Optical Laminate An optical laminate 3 in which a hard coat layer was formed on one side of the substrate film C was obtained in the same manner as in Example 1 except that the substrate film C was used. The said optical laminated body 3 was used for each evaluation. The results are shown in Table 1.
  • Example 4> Production of Base Film A base film D was produced in the same manner as in Example 1, except that the amount of the core-shell type particles was 13 parts by weight and the stretch temperature of the extruded film was 152 ° C. 2. Production of Optical Laminate An optical laminate 4 in which a hard coat layer was formed on one side of the substrate film D was obtained in the same manner as in Example 1 except that the substrate film D was used. The said optical laminated body 4 was used for each evaluation. The results are shown in Table 1.
  • ⁇ Comparative Example 1> Preparation of base film 100 parts by weight of the imidized MS resin obtained above and 15 parts by weight of core-shell type particles are put into a single screw extruder, melt mixed, and a film is formed through a T die to obtain an extruded film. It was. The obtained extruded film was simultaneously biaxially stretched twice in the length direction and the width direction at a stretching temperature of 152 ° C. The stretching speed was 10% / second in both the length direction and the width direction. In this way, a base film E having a thickness of 40 ⁇ m was produced. 2.
  • ⁇ Comparative example 2> Production of base film 100 parts by weight of the imidized MS resin obtained above and 23 parts by weight of core-shell type particles are put into a single screw extruder, melt mixed, and a film is formed through a T die to obtain an extruded film. It was. The obtained extruded film was simultaneously biaxially stretched twice in the length direction and the width direction at a stretching temperature of 137 ° C. The stretching speed was 10% / second in both the length direction and the width direction. In this way, a base film F having a thickness of 40 ⁇ m was produced. 2.
  • the optical laminates of Examples 1 to 4 using a base film having a resin component ratio of less than 20% were excellent in scratch resistance and adhesion.
  • the optical layered body of the present invention is suitably used as a protective layer for a polarizer.
  • the polarizing plate having the optical laminate of the present invention as a protective layer is suitably used for an image display device.
  • image display devices include portable devices such as personal digital assistants (PDAs), smart phones, mobile phones, watches, digital cameras, and portable game machines; OA devices such as personal computer monitors, notebook computers, and copy machines; video cameras, Household electrical equipment such as TVs and microwave ovens; Back monitors, monitors for car navigation systems, car audio equipment such as car audios; display equipment such as digital signage and commercial store information monitors; security equipment such as monitoring monitors; It can be used for various applications such as nursing care / medical devices such as nursing monitors and medical monitors.
  • PDAs personal digital assistants
  • OA devices such as personal computer monitors, notebook computers, and copy machines
  • video cameras Household electrical equipment such as TVs and microwave ovens
  • Back monitors monitors for car navigation systems, car audio equipment such as car audios

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007026659A1 (ja) * 2005-08-30 2007-03-08 Nitto Denko Corporation 偏光子保護フィルム、偏光板、および画像表示装置
JP2010237648A (ja) * 2009-03-09 2010-10-21 Toppan Printing Co Ltd 反射防止フィルム及びその製造方法、偏光板、透過型液晶ディスプレイ
JP2012234165A (ja) * 2011-04-22 2012-11-29 Nitto Denko Corp 光学積層体
JP2014095731A (ja) * 2012-10-12 2014-05-22 Fujifilm Corp 光学フィルム、偏光板ならびに液晶表示装置
JP2015069015A (ja) * 2013-09-30 2015-04-13 日東電工株式会社 光学積層体
JP2015090467A (ja) * 2013-11-07 2015-05-11 日東電工株式会社 光学積層体
JP2016004242A (ja) * 2014-06-19 2016-01-12 株式会社カネカ 積層体および該積層体を用いた偏光板

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101532462B1 (ko) * 2008-01-31 2015-06-29 닛토덴코 가부시키가이샤 편광자 보호 필름, 편광판 및 화상 표시 장치
JP6128576B2 (ja) * 2011-04-22 2017-05-17 日東電工株式会社 光学積層体
JP6011527B2 (ja) * 2011-04-26 2016-10-19 大日本印刷株式会社 反射防止フィルム、偏光板及び画像表示装置
JP6235287B2 (ja) * 2013-09-30 2017-11-22 日東電工株式会社 光学積層体
JP6479362B2 (ja) * 2014-07-31 2019-03-06 株式会社カネカ 偏光子保護フィルムおよび偏光板
JP2016218478A (ja) 2016-09-13 2016-12-22 住友化学株式会社 アクリル系樹脂フィルム及び偏光板

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007026659A1 (ja) * 2005-08-30 2007-03-08 Nitto Denko Corporation 偏光子保護フィルム、偏光板、および画像表示装置
JP2010237648A (ja) * 2009-03-09 2010-10-21 Toppan Printing Co Ltd 反射防止フィルム及びその製造方法、偏光板、透過型液晶ディスプレイ
JP2012234165A (ja) * 2011-04-22 2012-11-29 Nitto Denko Corp 光学積層体
JP2014095731A (ja) * 2012-10-12 2014-05-22 Fujifilm Corp 光学フィルム、偏光板ならびに液晶表示装置
JP2015069015A (ja) * 2013-09-30 2015-04-13 日東電工株式会社 光学積層体
JP2015090467A (ja) * 2013-11-07 2015-05-11 日東電工株式会社 光学積層体
JP2016004242A (ja) * 2014-06-19 2016-01-12 株式会社カネカ 積層体および該積層体を用いた偏光板

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023042922A1 (ja) * 2021-09-17 2023-03-23 三菱ケミカル株式会社 多層フィルムの製造方法、メラミン化粧板の製造方法、多層フィルム、メラミン化粧板用保護フィルム、及びメラミン化粧板

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