WO2017082134A1 - Polarizing plate and liquid crystal display device - Google Patents

Polarizing plate and liquid crystal display device Download PDF

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Publication number
WO2017082134A1
WO2017082134A1 PCT/JP2016/082577 JP2016082577W WO2017082134A1 WO 2017082134 A1 WO2017082134 A1 WO 2017082134A1 JP 2016082577 W JP2016082577 W JP 2016082577W WO 2017082134 A1 WO2017082134 A1 WO 2017082134A1
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WIPO (PCT)
Prior art keywords
polarizing plate
polarizer
coating layer
resin
film
Prior art date
Application number
PCT/JP2016/082577
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French (fr)
Japanese (ja)
Inventor
光明 小川
Original Assignee
住友化学株式会社
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Filing date
Publication date
Priority claimed from JP2016174380A external-priority patent/JP6819156B2/en
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to CN201680065539.2A priority Critical patent/CN108351460B/en
Priority to KR1020187016173A priority patent/KR102685433B1/en
Publication of WO2017082134A1 publication Critical patent/WO2017082134A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • 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
    • 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

Definitions

  • the present invention relates to a polarizing plate and a liquid crystal display device.
  • a protective film (brightness enhancement film) is laminated on the backlight side of the rear polarizing plate, and as a result, the protective film is bonded to the backlight unit via a double-sided tape.
  • a protective film integrated polarizing plate in which a polarizing plate and a protective film are bonded is used as the polarizing plate.
  • the object of the present invention is to prevent the double-sided tape from peeling off due to impact such as transportation or dropping in the process after bonding the protective film integrated polarizing plate attached to the liquid crystal cell and the backlight unit. It is an object to provide a polarizing plate that can be used and a liquid crystal display device using the polarizing plate.
  • the present invention provides the following polarizing plate and a liquid crystal display device using the polarizing plate.
  • the silica particles are particles that are surface-modified with an organic compound having a polymerizable unsaturated group.
  • the protective film (A) contains at least one resin selected from the group consisting of a cellulose resin, a (meth) acrylic resin, a cyclic polyolefin resin, a polyester resin, and a polycarbonate resin [1].
  • a liquid crystal display device comprising the polarizing plate according to any one of [1] to [12].
  • the protective film which is the junction between the liquid crystal cell and the backlight unit, is provided with a coating layer having an average unevenness interval Sm of 10 ⁇ m or less, thereby protecting it by impacts such as transportation and dropping in the process. It is possible to provide a polarizing plate capable of effectively preventing peeling of the film and the double-sided tape, and a liquid crystal display device including the same.
  • the polarizing plate of the present invention includes a polarizer, a protective film (A), and a coating layer in this order.
  • a polarizer an optical film having a property of absorbing linearly polarized light having a vibration surface parallel to the optical axis and transmitting linearly polarized light having a vibration surface orthogonal to the optical axis is preferable.
  • a polarizer in which a dichroic dye (iodine or dichroic organic dye) is adsorbed and oriented on a resin film.
  • the polyvinyl alcohol resin that forms the polyvinyl alcohol resin film can be obtained by saponifying a polyvinyl acetate resin.
  • the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith.
  • examples of other monomers copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
  • the degree of saponification of the polyvinyl alcohol-based resin is usually about 85 to 100 mol%, preferably 98 mol% or more.
  • This polyvinyl alcohol-based resin may be further modified, and polyvinyl formal and polyvinyl acetal modified with aldehydes may be used.
  • the degree of polymerization of the polyvinyl alcohol resin is usually 1000 to 10000, preferably 1500 to 5000.
  • Specific examples of polyvinyl alcohol resins and dichroic dyes include compounds exemplified in JP 2012-159778 A.
  • the film formed from the polyvinyl alcohol resin is used as a polarizer raw film.
  • the method for forming a polyvinyl alcohol-based resin is not particularly limited, and can be formed by a known method.
  • the thickness of the raw film made of polyvinyl alcohol resin is not particularly limited, but is usually 1 to 150 ⁇ m. In consideration of easiness of stretching, the thickness is preferably 3 ⁇ m or more.
  • a polarizer is a step of uniaxially stretching a polyvinyl alcohol-based resin film; a step of dyeing a polyvinyl alcohol-based resin film with a dichroic dye and adsorbing the dichroic dye; a polyvinyl alcohol-based adsorbed dichroic dye
  • the resin film can be produced through a step of treating with a boric acid aqueous solution; a step of washing with water after the treatment with the boric acid aqueous solution; and a drying step.
  • the thickness of the polarizer is usually 2 to 40 ⁇ m, preferably 5 to 30 ⁇ m.
  • the polarizer may be manufactured by a method described in JP 2012-159778 A.
  • a polyvinyl alcohol resin layer is formed by coating a polyvinyl alcohol resin on a base film, A polarizer is obtained by dyeing.
  • the protective film (A) is preferably provided by being laminated on a polarizer.
  • the protective film (A) preferably contains a light-transmitting thermoplastic resin, and more preferably contains a thermoplastic resin having good mechanical strength and thermal stability.
  • polyolefin resins such as chain polyolefin resins (polyethylene resins, polypropylene resins, etc.), cyclic polyolefin resins (norbornene resins, etc.); cellulose resins (triesters such as cellulose ester resins) Acetylcellulose, diacetylcellulose); polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polybutylene terephthalate; (meth) acrylic resins such as copolymers of (meth) acrylic resins and (meth) acrylic ester resins Examples of the resin include polystyrene resin, polycarbonate resin, polysulfone resin, polyethersulfone resin, and polyimide resin.
  • the protective film preferably contains at least one resin selected from the group consisting of cellulose resins, (meth) acrylic resins, cyclic polyolefin resins, polyester resins, and polycarbonate resins.
  • the protective film (A) may be a protective film having both optical functions such as a retardation film (optical compensation film) and a brightness enhancement film.
  • the retardation film include a film obtained by uniaxially or biaxially stretching a cyclic polyolefin resin film or the like, or a film obtained by coating and orienting a liquid crystal compound on a cellulose resin film or the like.
  • the protective film (A) may be a birefringent film. Further, the protective film (A) may be a laminated film of a plurality of protective films.
  • N x is the in-plane slow axis direction of the refractive index in the above formulas
  • n y is a refractive index in the in-plane fast axis direction (perpendicular to the plane slow axis direction)
  • n z is the refractive index in the thickness direction
  • d is the thickness of the film.
  • the retardation film include a 1 / 4 ⁇ plate.
  • the brightness enhancement film is used for the purpose of improving brightness in a liquid crystal display device or the like.
  • a brightness enhancement film As a brightness enhancement film, a plurality of thin film films having different refractive index anisotropy are laminated to form a reflection type polarization separation sheet designed to produce anisotropy in reflectance, an alignment film of cholesteric liquid crystal polymer, and its orientation Examples thereof include a circularly polarized light separating sheet having a liquid crystal layer supported on a film substrate.
  • Commercially available products such as Advanced Polarized Film, Version 3 manufactured by 3M may also be used as the brightness enhancement film.
  • the thickness of the protective film (A) is usually 5 to 200 ⁇ m, preferably 10 to 80 ⁇ m, more preferably 10 to 40 ⁇ m.
  • the polarizing plate of this invention is a polarizing plate which contains a polarizer, a protective film (A), and a coating layer in this order, and also has a protective film (B) in the side far from the coating layer in a polarizer.
  • the polarizing plate has a configuration including a protective film (B), a polarizer, a protective film (A), and a coating layer in this order.
  • the protective film (B) is preferably laminated on the polarizer.
  • a protective film similar to the protective film (A) described above can be selected.
  • the polarizing plate of this invention contains a polarizer, a protective film (A), and a coating layer in this order, it is preferable that the coating layer is provided in contact with the protective film (A).
  • the coating layer refers to a layer obtained by applying a coating liquid containing a resin, and the coating layer is preferably formed from a (meth) acrylic resin, and may have a single layer structure, A multilayer structure may be used.
  • the coating layer include an antiglare layer, a hard coat layer, a low refractive index layer, an antireflection layer, an antistatic layer, an antifouling layer, or a layer having two or more functions (characteristics).
  • a hard coat layer is preferred.
  • the surface far from the polarizer in the coating layer of the polarizing plate of the present invention satisfies the surface characteristics represented by the following formula (1).
  • Sm is preferably 5 ⁇ m or less, and more preferably 4 ⁇ m or less.
  • the surface far from the polarizer in the normal coating layer is a surface to which a double-sided tape for bonding to the backlight unit is attached.
  • Sm ⁇ 10 In the formula (1), Sm represents an average interval of the unevenness of the light source side surface in the coating layer. The unit is ⁇ m.
  • the surface of the coating layer on the side far from the polarizer satisfies the above formula (1), the surface of the coating layer has fine surface irregularities, so that the step in the process after bonding the polarizing plate and the backlight unit is performed. Peeling between the coating layer and a member such as a double-sided tape due to an impact such as conveyance or dropping can be prevented.
  • the average interval Sm of the unevenness is a parameter defined by JIS B 0601: 1994 “average value of interval between the valley and the period obtained from the intersection where the roughness curve intersects the average line”, and is defined by the following equation: .
  • Sm can be measured by a commercially available three-dimensional shape measuring device, a roughness meter, or the like.
  • the arithmetic average roughness Ra is preferably 50 nm or more.
  • the arithmetic average roughness Ra is a parameter defined in 4.2.1 of JIS B 0601: 2013, and means an average value of absolute values of the height Z (x) in the reference length.
  • the Sm value can be adjusted by a known method applied in the field of an antiglare film used to prevent reflection of external light and glare due to surface irregularities, and the coating layer can be formed from a coating solution containing particles. And a method of transferring a surface uneven shape by pressing a mold (embossed mold) provided with surface unevenness onto a coating layer of a translucent resin.
  • the coating layer in which the Sm value of the polarizing plate of the present invention is adjusted is preferably a coating layer containing particles.
  • the method for forming the coating layer containing particles include a method of applying a coating liquid containing a translucent resin and particles.
  • the coating method for the coating liquid include a gravure coating method, a micro gravure coating method, a rod coating method, a knife coating method, an air knife coating method, a kiss coating method, and a die coating method.
  • the particles contained in the coating liquid are preferably translucent particles such as (meth) acrylic resins, melamine resins, polyethylene resins, polystyrene resins, organic silicone resins, (meth) acrylic acid ester-styrene copolymers, etc.
  • “(meth) acrylic acid” represents at least one selected from the group consisting of acrylic acid and methacrylic acid. Notations such as “(meth) acrylate” have the same meaning.
  • Examples of the particle shape include a spherical shape, a flat shape, a plate shape, a needle shape, and an indefinite shape.
  • silica particles are more preferable.
  • the silica particle surface-modified with the organic compound which has a polymerizable unsaturated group which can react with a translucent resin is especially preferable at the point of forming a strong bond with the below-mentioned translucent resin.
  • Silica particles surface-modified with an organic compound having a polymerizable unsaturated group are polymerizable unsaturated groups having a (meth) acryloyl group which is a functional group capable of reacting with the silanol group on the silanol group on the surface of the silica particle. It can be obtained by reacting the contained organic compound.
  • the organic compound having a polymerizable unsaturated group for modifying the surface of the silica particles may correspond to a translucent resin described later, but the compound for modifying the surface of the silica particles is And is included as a constituent element of silica particles, and is distinguished from a light-transmitting resin described later.
  • Examples of the polymerizable unsaturated group-containing organic compound having a functional group capable of reacting with the silanol group include compounds represented by the following formula (I). (In the formula, R 1 represents a hydrogen atom or a methyl group, and R 2 represents a halogen atom or a group represented by the following formula.)
  • Examples of the compound represented by the formula (I) include (meth) acrylic acid, (meth) acrylic acid chloride, 2-isocyanatoethyl (meth) acrylate, glycidyl (meth) acrylate, (meth) acrylic acid 2, Examples include (meth) acrylic acid derivatives such as 3-iminopropyl, 2-hydroxyethyl (meth) acrylate, and (meth) acryloyloxypropyltrimethoxysilane.
  • the organic compound having a polymerizable unsaturated group that modifies the surface of the silica particles may be used alone or in combination of two or more.
  • the content of the particles is usually 3 to 60 parts by weight, preferably 3 to 50 parts by weight with respect to 100 parts by weight of the light-transmitting resin described later.
  • the content of the particles exceeds 60 parts by weight, the transparency of the resulting coating layer may be impaired.
  • the polarizing plate is applied to the image display device, the light scattering intensity is too strong. For example, in the black display, light leaking obliquely with respect to the front direction of the image display device is directed to the front direction by the coating layer. It may be strongly scattered, reducing the contrast.
  • the weight average particle diameter of the particles is preferably 1 nm to 1 ⁇ m, more preferably 1 to 50 nm, and further preferably 1 to 20 nm. The weight average particle diameter can be measured with a scanning tunneling microscope.
  • Examples of the translucent resin contained in the coating liquid include an active energy ray curable resin such as an ultraviolet curable resin and an electron beam curable resin, a thermosetting resin, a thermoplastic resin, and a metal alkoxide.
  • An active energy ray-curable resin is preferable in that high hardness and scratch resistance can be imparted.
  • Active energy ray curable resins include polyfunctional (meth) acrylates such as (meth) acrylic acid esters of polyhydric alcohols; terminal isocyanato group urethane prepolymers obtained by reaction of diisocyanates with polyhydric alcohols (meth) Polyfunctional urethane (meth) acrylates such as those obtained by reacting hydroxyalkyl esters of acrylic acid are included.
  • polyether resins having a (meth) acrylate functional group polyester resins, epoxy resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, and the like can also be active energy ray curable resins.
  • thermosetting resin examples include a phenol resin, a urea melamine resin, an epoxy resin, an unsaturated polyester resin, and a silicone resin, in addition to a thermosetting urethane resin composed of an acrylic polyol and an isocyanate prepolymer.
  • Thermoplastic resins include cellulose derivatives such as acetylcellulose, nitrocellulose, acetylbutylcellulose, ethylcellulose, and methylcellulose; vinyl acetate homopolymers or copolymers, vinyl chloride homopolymers or copolymers, vinylidene chloride Vinyl resins such as homopolymers or copolymers; acetal resins such as polyvinyl formal and polyvinyl butyral; (meth) acrylic resins such as (meth) acrylic resins and (meth) acrylic acid ester copolymers Examples of resins include polystyrene resins, polyamide resins, polyester resins, and polycarbonate resins.
  • an alkoxysilane-based material can be used, and the metal alkoxide forms a silicon oxide-based matrix by hydrolysis or dehydration condensation.
  • Examples include tetramethoxysilane and tetraethoxysilane.
  • active energy ray curable resins and thermosetting resins are in a liquid state, and metal alkoxides are often liquid.
  • the liquid resin can be used as it is as a coating liquid for forming a coating layer, but if necessary, it may be diluted with a solvent or the like as a coating liquid.
  • a resin prepared as a solid such as a thermoplastic resin is preferably used as a coating solution in a state where it is usually dissolved in an appropriate solvent.
  • the coating liquid containing an active energy ray curable resin, a thermosetting resin, a metal alkoxide, or a thermoplastic resin may contain an appropriate additive such as a leveling agent or a dispersant.
  • the coating liquid contains an active energy ray-curable resin
  • the coating liquid contains a photopolymerization initiator.
  • photopolymerization initiators benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2, 2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2- Morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylamin
  • the coating liquid may contain an ultraviolet absorber.
  • the UV absorber include benzotriazole UV absorbers, hindered amine UV absorbers, benzophenone UV absorbers, and triazine UV absorbers.
  • An ultraviolet absorber may be used independently and may be used in combination of 2 or more type.
  • a radical polymerizable ultraviolet absorber having a radical polymerizable double bond in the molecule is preferred.
  • the coating liquid may contain a light stabilizer.
  • light stabilizers include hindered amine light stabilizers, benzophenone light stabilizers, and benzotriazole light stabilizers.
  • a light stabilizer may be used independently and may be used in combination of 2 or more type.
  • the coating layer is provided in contact with the protective film (A), for the purpose of improving the coating property of the coating liquid or improving the adhesion between the resulting coating layer and the protective film (A),
  • Various surface treatments may be applied to the surface on which the coating for forming the coating layer is applied. Examples of the surface treatment include corona discharge treatment, glow discharge treatment, acid surface treatment, alkali surface treatment, and ultraviolet irradiation treatment.
  • the transmittance of the coating layer is preferably 80% or more, and more preferably 95% or more.
  • the transmissivity here refers to the transmissivity with respect to light having a wavelength of 380 to 780 nm, and the transmissivity subjected to visibility correction. According to the present invention, both the translucency of the coating layer and the adhesion to the double-sided tape can be achieved.
  • the pencil hardness of the coating layer is preferably B or more, more preferably F or more, still more preferably 2H or more, and usually 9H or less.
  • the pencil hardness is measured in accordance with the pencil hardness test specified in JIS K5600-5-4: 1999 “General test method for paints—Part 5: Mechanical properties of coating film—Section 4: Scratch hardness (pencil method)”. be able to.
  • the backlight unit and the polarizing plate having the coating layer may be arranged very close to each other, and the backlight unit comes into contact with the coating layer by setting the pencil hardness of the coating layer to B or more. Can also prevent the surface of the polarizing plate from being scratched.
  • a polarizing plate 10 includes a polarizer 13 and a coating layer 16, a protective film (A) 14 is provided between the polarizer 13 and the coating layer 16, and a side of the polarizer far from the coating layer.
  • the protective film (B) 15 is provided on the surface.
  • the polarizing plate 10 is a polarizing plate with an adhesive layer in which an adhesive layer 17 is laminated on the surface of the protective film 15 far from the coating layer in order to bond the image display element 20 and the polarizing plate.
  • the adhesive examples include a water-based adhesive containing a polyvinyl alcohol-based resin or a urethane resin as a main component, and a photo-curable adhesive including a photo-curable resin such as an ultraviolet curable resin (such as an epoxy-based resin).
  • a photo-curable adhesive including a photo-curable resin such as an ultraviolet curable resin (such as an epoxy-based resin).
  • the pressure-sensitive adhesive include pressure-sensitive adhesives based on acrylic polymers, silicone polymers, polyesters, polyurethanes, polyethers, and the like.
  • the adhesive contains light scattering particles, glass fibers, glass beads, resin beads, fillers such as metal powder and other inorganic powders, pigments, colorants, antioxidants, ultraviolet absorbers, etc. It may be.
  • the bonding surface of the polarizer and / or the protective film may be subjected to easy adhesion treatment such as saponification treatment, corona treatment, primer treatment, anchor coating treatment and the like.
  • a polarizing plate 50 represents a polarizing plate using a brightness enhancement film 54 as the protective film (A) 14 in the polarizing plate shown in FIG.
  • a polarizing plate 60 has a polarizer 63 and a coating layer 69, and a protective film 68 and a brightness enhancement film 64 are provided between the polarizer 63 and the coating layer 69 from the side close to the polarizer.
  • a protective film (A) is formed.
  • a protective film (B) 65 is provided on the surface of the polarizer far from the coating layer.
  • the protective film 68 and the brightness enhancement film 64 are bonded via an adhesive layer 66.
  • the polarizing plate 60 is a polarizing plate with an adhesive layer in which an adhesive layer 67 is laminated on a surface far from the coating layer of the protective film (B) 65 in order to bond the image display element 20 and the polarizing plate. It is.
  • the adhesive agent layer which bonds a polarizer and protective film (A) and (B) is not illustrated.
  • a polarizing plate 70 has a polarizer 73 and a coating layer 77, and a protective film 74 and a brightness enhancement film 75 are provided between the polarizer 73 and the coating layer 77 from the side close to the polarizer.
  • a protective film (A) is formed.
  • the protective film 74 and the brightness enhancement film 75 are bonded via an adhesive layer 76.
  • the polarizing plate 70 is a polarizing plate with a pressure-sensitive adhesive layer in which a pressure-sensitive adhesive layer 72 is laminated on a surface far from the coating layer of the polarizer 73 in order to bond the image display element 20 and the polarizing plate.
  • the adhesive layer which bonds a polarizer and a protective film (A) is not illustrated.
  • the polarizing plate of the present invention can be preferably used for various devices such as a liquid crystal display device, and can be particularly preferably used for a transmissive or transflective liquid crystal display device.
  • image display elements forming a liquid crystal display device include VA mode, IPS mode, TN mode, FFS mode, AFFS mode, OCB mode, and liquid crystal driving mode using a liquid crystal of blue phase.
  • the liquid crystal display device is provided with known members used in liquid crystal display devices such as a prism array sheet, a lens array sheet, a light diffusion plate, and a backlight. Can do.
  • the polarizing plate of the present invention is preferably installed on the backlight side of the image display element, so that the coating layer in the polarizing plate is the layer closest to the backlight. It is more preferable to install in the.
  • the polarizing plate of the present invention may be installed on both sides of the image display element.
  • An example of the configuration of a liquid crystal display device having the polarizing plate of the present invention will be described with reference to FIG.
  • a polarizing plate 10 with an adhesive is bonded to the backlight side of the image display element 20 via an adhesive layer 17.
  • the coating layer 16 of the polarizing plate with an adhesive 10 and the backlight unit 40 are bonded together by a double-sided tape 41.
  • the backlight includes a light source (not shown), a light guide plate 42, and a prism array sheet 43.
  • a triacetyl cellulose film [trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.] having a thickness of 40 ⁇ m was used.
  • Shin-Nakamura Chemical Co., Ltd. produced silica particles (weight average particle diameter of 1 to 20 nm) surface-modified with an organic compound having a polymerizable unsaturated group described in JP-A-9-100111 on one side of a triacetyl cellulose film.
  • a mixture of two types of acrylic hard coat resins (product name: A-DCP, UA-1100H) obtained from Kogyo Co., Ltd. was applied by a bar coater and dried in a constant temperature bath at 80 ° C. for 1 minute.
  • the irradiation amount 350mJ / cm 2 from the coated surface side Ultraviolet rays were irradiated to form a hard coat layer as a coating layer, and a triacetyl cellulose film having a hard coat layer was obtained. It was F when the pencil hardness of the hard coat layer was measured.
  • a brightness enhancement film (Advanced Polarized Film, Version 3 manufactured by 3M) was used.
  • a hard coat layer was formed as a coating layer on the polycarbonate surface of the brightness enhancement film in the same manner as in Production Example 1 to obtain a brightness enhancement film having a hard coat layer. It was F when the pencil hardness of the hard coat layer was measured.
  • a brightness enhancement film (Advanced Polarized Film, Version 3 manufactured by 3M) was used.
  • a hard coat layer was formed as a coating layer on the polycarbonate surface of the brightness enhancement film by the same method except that the UV output was changed to 60% and the irradiation amount was 290 mJ / cm 2 from the conditions described in Production Example 1.
  • a brightness enhancement film having a coating layer was obtained. It was HB when the pencil hardness of the hard coat layer was measured.
  • a brightness enhancement film (Advanced Polarized Film, Version 3 manufactured by 3M) was used.
  • a hard coat layer was formed as a coating layer on the polycarbonate surface of the brightness enhancement film by the same method except that the UV output was changed to 55% and the irradiation amount was 230 mJ / cm 2 from the conditions described in Production Example 1.
  • a brightness enhancement film having a coating layer was obtained. It was B when the pencil hardness of the hard coat layer was measured.
  • Example 1 A 30 ⁇ m-thick polyvinyl alcohol film (average polymerization degree of about 2400, saponification degree of 99.9 mol% or more) was uniaxially stretched about 5 times by dry stretching, and further kept in a pure water at 60 ° C. while maintaining tension. After being immersed for 1 minute, it was immersed in an aqueous solution containing 0.05 part of iodine and 5 parts of potassium iodide for 60 seconds at 28 ° C. with respect to 100 parts of water. 100 parts of water was immersed in an aqueous solution containing 8.5 parts of potassium iodide and 8.5 parts of boric acid at 72 ° C. for 300 seconds.
  • the film was washed with pure water at 26 ° C. for 20 seconds and then dried at 65 ° C. to obtain a 11 ⁇ m thick polarizer in which iodine was adsorbed and oriented on a polyvinyl alcohol film.
  • 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof.
  • a water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 ⁇ m was bonded as a protective film (B).
  • An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 ⁇ m.
  • the triacetyl cellulose film having the hard coat layer obtained in Production Example 1 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Got.
  • Example 2 A polarizer was obtained in the same manner as in Example 1. Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • KL-318 carboxyl group-modified polyvinyl alcohol
  • a water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • an epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 ⁇ m was bonded as a protective film (B).
  • An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 ⁇ m.
  • the brightness enhancement film having the hard coat layer obtained in Production Example 2 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Obtained.
  • Example 3 A polarizer was obtained in the same manner as in Example 1. Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • KL-318 carboxyl group-modified polyvinyl alcohol
  • a water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 ⁇ m was bonded as a protective film (B).
  • An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 ⁇ m.
  • a 40 ⁇ m-thick triacetyl cellulose film (trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.) and a polarizer were bonded as a protective film through the pressure-sensitive adhesive layer.
  • the protective film (A) is a laminated film of a triacetyl cellulose film and a brightness enhancement film.
  • Example 4 A polarizer was obtained in the same manner as in Example 1. Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • KL-318 carboxyl group-modified polyvinyl alcohol
  • a water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • An epoxy adhesive was applied, and a 40 ⁇ m thick triacetyl cellulose film (trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.) was bonded as a protective film.
  • An adhesive (trade name “# L2” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the triacetyl cellulose film to form an adhesive layer having a thickness of 5 ⁇ m.
  • the brightness enhancement film having the hard coat layer obtained in Production Example 2 was bonded via the pressure-sensitive adhesive layer so that the hard coat layer became the outermost surface of the polarizing plate.
  • the protective film (A) is a laminated film of a triacetyl cellulose film and a brightness enhancement film.
  • Example 5 A polarizer was obtained in the same manner as in Example 1. Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • KL-318 carboxyl group-modified polyvinyl alcohol
  • a water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • an epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 ⁇ m was bonded as a protective film (B).
  • An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 ⁇ m.
  • the brightness enhancement film having a hard coat layer obtained in Production Example 3 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Obtained.
  • Example 6 A polarizer was obtained in the same manner as in Example 1. Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • KL-318 carboxyl group-modified polyvinyl alcohol
  • a water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • an epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 ⁇ m was bonded as a protective film (B).
  • An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 ⁇ m.
  • the brightness enhancement film having a hard coat layer obtained in Production Example 4 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Obtained.
  • a triacetyl cellulose film having a thickness of 40 ⁇ m (trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.) was used. Coated with two types of acrylic hard coat resin (Product name: A-DCP, UA-1100H) obtained from Shin-Nakamura Chemical Co., Ltd. that does not contain silica particles on one side of a triacetyl cellulose film. And dried in a constant temperature bath at 80 ° C. for 1 minute.
  • the irradiation amount 350mJ / cm 2 from the coated surface side Ultraviolet rays were irradiated to form a hard coat layer as a coating layer, and a triacetyl cellulose film having a hard coat layer was obtained.
  • the pencil hardness of the hard coat layer was measured, it was below HB.
  • a brightness enhancement film (Advanced Polarized Film, Version 3 manufactured by 3M) was used.
  • a hard coat layer was formed as a coating layer on the polycarbonate surface of the brightness enhancement film in the same manner as in Production Example 5 to obtain a brightness enhancement film having a hard coat layer.
  • the pencil hardness of the hard coat layer was measured, it was below HB.
  • Example 1 A polarizer was obtained in the same manner as in Example 1. Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • KL-318 carboxyl group-modified polyvinyl alcohol
  • a water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • an epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 ⁇ m was bonded as a protective film (B).
  • An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 ⁇ m.
  • the triacetyl cellulose film having the hard coat layer obtained in Production Example 5 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Got.
  • Example 2 A polarizer was obtained in the same manner as in Example 1. Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • KL-318 carboxyl group-modified polyvinyl alcohol
  • a water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • an epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 ⁇ m was bonded as a protective layer (B).
  • An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 ⁇ m.
  • the brightness enhancement film having the hard coat layer obtained in Production Example 6 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Obtained.
  • Example 3 A polarizer was obtained in the same manner as in Example 1. Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • KL-318 carboxyl group-modified polyvinyl alcohol
  • a water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 ⁇ m was bonded as a protective film (B).
  • An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 ⁇ m.
  • a 40 ⁇ m-thick triacetyl cellulose film (trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.) and a polarizer were bonded as a protective film through the pressure-sensitive adhesive layer.
  • the protective film (A) is a laminated film of a triacetyl cellulose film and a brightness enhancement film.
  • Example 4 A polarizer was obtained in the same manner as in Example 1. Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • KL-318 carboxyl group-modified polyvinyl alcohol
  • a water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%).
  • An epoxy adhesive was applied, and a 40 ⁇ m thick triacetyl cellulose film (trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.) was bonded as a protective film.
  • An adhesive (trade name “# L2” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the triacetyl cellulose film to form an adhesive layer having a thickness of 5 ⁇ m.
  • the brightness enhancement film having the hard coat layer obtained in Production Example 6 was bonded via the pressure-sensitive adhesive layer so that the hard coat layer became the outermost surface of the polarizing plate.
  • the protective film (A) is a laminated film of a triacetyl cellulose film and a brightness enhancement film.
  • the backlight tape that protruded 30 to 40 mm from the glass in the laminate was sandwiched between chucks of an autograph AGS-50NX type tensile tester manufactured by Shimadzu Corporation, and the atmosphere was 23 ° C./50%.
  • the backlight tape adhesion was measured when the tape was peeled 180 degrees at a tensile speed of 300 mm / min. The results are shown in Table 1.
  • the transmittance (A) of the protective film having the coating layer obtained in Production Examples 1 and 2 and Production Examples 5 and 6, and the protective film (brightness enhancement film) before applying the coating liquid for forming the coating layer And the transmittance (B) of the triacetyl cellulose film) was measured.
  • the transmittance (A) was a relative value when the transmittance (B) was 100%. It measured with the spectrophotometer with an integrating sphere (JASCO Corporation make, V7100).
  • MD transmittance and TD transmittance are obtained in the wavelength range of 380 to 780 nm, the single transmittance at each wavelength is calculated based on the formula (1), and the visibility is corrected by the two-degree field of view (C light source) of JIS Z 8701 And the visibility corrected single transmittance (Ty) was obtained.
  • C light source the two-degree field of view
  • Ty the visibility corrected single transmittance
  • the “TD transmittance” is a transmittance when the direction of polarized light emitted from the Glan-Thompson prism is orthogonal to the transmission axis of the polarizing plate, and is expressed as “TD” in the equation (1).
  • Single transmittance (%) (MD + TD) / 2 Formula (1)
  • the present invention it is possible to prevent the double-sided tape from being peeled off due to an impact such as transportation or dropping in the process after bonding the protective film integrated polarizing plate attached to the liquid crystal cell and the backlight unit. It is possible to provide a polarizing plate that can be used, and a liquid crystal display device using the polarizing plate.

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Abstract

[Problem] If there is poor adhesion between double-sided tape and a protection film in a polarizing plate, then when said plate is subjected to shock when transported, dropped, etc., during a step, forces will concentrate in the protection film, which is the portion where the polarizing plate and a backlight unit are joined, and the polarizing plate will come away from the backlight. Accordingly, there has been a need to provide: a polarizing plate with which it is possible to prevent peeling of the double-sided tape due to the shock resulting from transportation, dropping, etc., during the steps subsequent to the joining of the backlight and the polarizing plate in which the protection film has been integrated; and a liquid-crystal display device in which the polarizing plate is used. [Solution] A polarizing plate that has a polarizer, a protection film (A) and a coating layer, in the stated order, wherein the mean spacing Sm between protrusions and recesses on the surface of the coating layer on the far side from the polarizer is 10 μm or less.

Description

偏光板及び液晶表示装置Polarizing plate and liquid crystal display device
　本発明は、偏光板及び液晶表示装置に関する。 The present invention relates to a polarizing plate and a liquid crystal display device.
　近年、スマートフォンなどのモバイル端末はデザインの面や携帯性の面から、画面の狭額縁化が進みつつある。この画面の狭額縁化に対応すべく、幅数ｍｍの両面テープを介してリア側の偏光板とバックライトとを貼り合わせる方法が採用されている。そして通常は、かかる両面テープによる貼り合わせの前に、粘着剤を介して液晶セルと偏光板とを張り合わせることが多い。 In recent years, mobile terminals such as smartphones are becoming narrower on the screen in terms of design and portability. In order to cope with the narrowing of the picture frame, a method is adopted in which the polarizing plate on the rear side and the backlight are bonded via a double-sided tape having a width of several mm. In general, the liquid crystal cell and the polarizing plate are often bonded to each other through an adhesive before the bonding with the double-sided tape.
　また、リア側偏光板のバックライト側には、保護膜（輝度向上フィルム）が積層されており、帰するところ保護膜が、両面テープを介してバックライトユニットと接合している。このように偏光板としては、偏光板と保護膜とを貼り合せた保護膜一体型偏光板が使用される。 Also, a protective film (brightness enhancement film) is laminated on the backlight side of the rear polarizing plate, and as a result, the protective film is bonded to the backlight unit via a double-sided tape. As described above, a protective film integrated polarizing plate in which a polarizing plate and a protective film are bonded is used as the polarizing plate.
特開２００２－３６５４３０号公報JP 2002-365430 A
　しかしながら、前述したように、液晶セルに貼り付けられた保護膜一体型偏光板とバックライトユニットとを接合するために、偏光板のバックライト側の保護膜に直接両面テープを貼り付けたとき、保護膜と両面テープとの間の密着力が弱いと、工程内での搬送や落下等で衝撃を受けた際に偏光板とバックライトユニットとの接合部である保護膜に力が集中し、偏光板がバックライトユニットから脱落するという問題が発生する。 However, as described above, in order to join the protective film integrated polarizing plate attached to the liquid crystal cell and the backlight unit, when the double-sided tape is directly attached to the protective film on the backlight side of the polarizing plate, If the adhesion between the protective film and the double-sided tape is weak, the force concentrates on the protective film that is the junction between the polarizing plate and the backlight unit when impacted by transport or dropping in the process. There arises a problem that the polarizing plate falls off the backlight unit.
　本発明の目的は、液晶セルに貼り付けられた保護膜一体型偏光板とバックライトユニットとを接合した後の、工程内での搬送や落下等の衝撃による両面テープの剥がれを抑止することのできる偏光板、および該偏光板を用いた液晶表示装置を提供することを目的とする。 The object of the present invention is to prevent the double-sided tape from peeling off due to impact such as transportation or dropping in the process after bonding the protective film integrated polarizing plate attached to the liquid crystal cell and the backlight unit. It is an object to provide a polarizing plate that can be used and a liquid crystal display device using the polarizing plate.
本発明は、以下に示す偏光板、および該偏光板を用いた液晶表示装置を提供する。
［１］偏光子、保護膜（Ａ）及びコーティング層をこの順に有する偏光板であって、
前記コーティング層における前記偏光子から遠い側の面の凹凸平均間隔Ｓｍが１０μｍ以下である偏光板。
［２］前記コーティング層が、シリカ粒子を含む［１］に記載の偏光板。
［３］前記シリカ粒子が、重合性不飽和基を有する有機化合物で表面修飾された粒子である［２］に記載の偏光板。
［４］前記シリカ粒子の重量平均粒子径が、１～２０ｎｍである［２］または［３］に記載の偏光板。
［５］前記コーティング層が、ハードコート層である［１］～［４］のいずれかに記載の偏光板。
［６］前記コーティング層の鉛筆硬度が、ＨＢ以上である［１］～［５］のいずれかに記載の偏光板。
［７］前記コーティング層の視感度補正透過率が、８０％以上である［１］～［６］のいずれかに記載の偏光板。
［８］前記偏光子の厚みが、３０μｍ以下である［１］～［７］のいずれかに記載の偏光板。
［９］前記保護膜（Ａ）が、輝度向上フィルムを含む［１］～［８］のいずれかに記載の偏光板。
［１０］前記保護膜（Ａ）が、セルロース系樹脂、（メタ）アクリル系樹脂、環状ポリオレフィン系樹脂、ポリエステル系樹脂、及びポリカーボネート系樹脂からなる群から選ばれる少なくとも一種の樹脂を含む［１］～［９］のいずれかに記載の偏光板。
［１１］前記保護膜（Ａ）が、面内位相差を有する［１］～［１０］のいずれかに記載の偏光板。
［１２］前記偏光子における前記コーティング層から遠い側の面に保護膜（Ｂ）を有する［１］～［１１］のいずれかに記載の偏光板。
［１３］［１］～［１２］のいずれかに記載の偏光板を有する液晶表示装置。 The present invention provides the following polarizing plate and a liquid crystal display device using the polarizing plate.
[1] A polarizing plate having a polarizer, a protective film (A) and a coating layer in this order,
The polarizing plate whose uneven | corrugated average space | interval Sm of the surface on the side far from the said polarizer in the said coating layer is 10 micrometers or less.
[2] The polarizing plate according to [1], wherein the coating layer contains silica particles.
[3] The polarizing plate according to [2], wherein the silica particles are particles that are surface-modified with an organic compound having a polymerizable unsaturated group.
[4] The polarizing plate according to [2] or [3], wherein the silica particles have a weight average particle diameter of 1 to 20 nm.
[5] The polarizing plate according to any one of [1] to [4], wherein the coating layer is a hard coat layer.
[6] The polarizing plate according to any one of [1] to [5], wherein the coating layer has a pencil hardness of HB or higher.
[7] The polarizing plate according to any one of [1] to [6], wherein the visibility-corrected transmittance of the coating layer is 80% or more.
[8] The polarizing plate according to any one of [1] to [7], wherein the polarizer has a thickness of 30 μm or less.
[9] The polarizing plate according to any one of [1] to [8], wherein the protective film (A) includes a brightness enhancement film.
[10] The protective film (A) contains at least one resin selected from the group consisting of a cellulose resin, a (meth) acrylic resin, a cyclic polyolefin resin, a polyester resin, and a polycarbonate resin [1]. The polarizing plate according to any one of to [9].
[11] The polarizing plate according to any one of [1] to [10], wherein the protective film (A) has an in-plane retardation.
[12] The polarizing plate according to any one of [1] to [11], which has a protective film (B) on the surface of the polarizer far from the coating layer.
[13] A liquid crystal display device comprising the polarizing plate according to any one of [1] to [12].
　本発明によれば、液晶セルとバックライトユニットとの接合部である保護膜に凹凸の平均間隔Ｓｍが１０μｍ以下であるコーティング層を設けることで、工程内での搬送や落下等の衝撃による保護膜と両面テープの剥がれを効果的に防止できる偏光板、並びにそれを含む液晶表示装置を提供することができる。 According to the present invention, the protective film, which is the junction between the liquid crystal cell and the backlight unit, is provided with a coating layer having an average unevenness interval Sm of 10 μm or less, thereby protecting it by impacts such as transportation and dropping in the process. It is possible to provide a polarizing plate capable of effectively preventing peeling of the film and the double-sided tape, and a liquid crystal display device including the same.
本発明に係る偏光板、並びにそれを含む液晶表示装置の一例を示す概略断面図である。It is a schematic sectional drawing which shows an example of the polarizing plate which concerns on this invention, and a liquid crystal display device containing the same. 本発明に係る偏光板、並びにそれを含む液晶表示装置の一例を示す概略断面図である。It is a schematic sectional drawing which shows an example of the polarizing plate which concerns on this invention, and a liquid crystal display device containing the same. 本発明に係る偏光板、並びにそれを含む液晶表示装置の一例を示す概略断面図である。It is a schematic sectional drawing which shows an example of the polarizing plate which concerns on this invention, and a liquid crystal display device containing the same. 本発明に係る偏光板、並びにそれを含む液晶表示装置の一例を示す概略断面図である。It is a schematic sectional drawing which shows an example of the polarizing plate which concerns on this invention, and a liquid crystal display device containing the same. 本発明に係る偏光板、並びにそれを含む液晶表示装置の一例を示す概略断面図である。It is a schematic sectional drawing which shows an example of the polarizing plate which concerns on this invention, and a liquid crystal display device containing the same.
本発明の偏光板は、偏光子、保護膜（Ａ）、およびコーティング層をこの順に含む。以下、偏光板を構成する各部材について説明する。
［偏光子］
　偏光子としては、光学軸に平行な振動面をもつ直線偏光を吸収し、光学軸に直交する振動面をもつ直線偏光を透過する性質を有する光学フィルムが好ましく、具体的には、ポリビニルアルコール系樹脂フィルムに二色性色素（ヨウ素又は二色性有機染料）が吸着配向された偏光子が挙げられる。 The polarizing plate of the present invention includes a polarizer, a protective film (A), and a coating layer in this order. Hereinafter, each member which comprises a polarizing plate is demonstrated.
[Polarizer]
As the polarizer, an optical film having a property of absorbing linearly polarized light having a vibration surface parallel to the optical axis and transmitting linearly polarized light having a vibration surface orthogonal to the optical axis is preferable. Examples thereof include a polarizer in which a dichroic dye (iodine or dichroic organic dye) is adsorbed and oriented on a resin film.
　ポリビニルアルコール系樹脂フィルムを形成するポリビニルアルコール系樹脂は、ポリ酢酸ビニル系樹脂をケン化することにより得ることができる。ポリ酢酸ビニル系樹脂としては、酢酸ビニルの単独重合体であるポリ酢酸ビニルのほか、酢酸ビニル及びこれと共重合可能な他の単量体の共重合体等が挙げられる。酢酸ビニルに共重合される他の単量体としては、不飽和カルボン酸類、オレフィン類、ビニルエーテル類、不飽和スルホン酸類、アンモニウム基を有するアクリルアミド類等を挙げることができる。 The polyvinyl alcohol resin that forms the polyvinyl alcohol resin film can be obtained by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith. Examples of other monomers copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
　ポリビニルアルコール系樹脂のケン化度は、通常８５～１００モル％程度、好ましくは９８モル％以上である。このポリビニルアルコール系樹脂はさらに変性されていてもよく、アルデヒド類で変性されたポリビニルホルマールやポリビニルアセタール等も使用し得る。 The degree of saponification of the polyvinyl alcohol-based resin is usually about 85 to 100 mol%, preferably 98 mol% or more. This polyvinyl alcohol-based resin may be further modified, and polyvinyl formal and polyvinyl acetal modified with aldehydes may be used.
　ポリビニルアルコール系樹脂の重合度は、通常１０００～１００００、好ましくは１５００～５０００である。具体的なポリビニルアルコール系樹脂や二色性色素としては、特開２０１２－１５９７７８号公報等に例示されている化合物が挙げられる。 The degree of polymerization of the polyvinyl alcohol resin is usually 1000 to 10000, preferably 1500 to 5000. Specific examples of polyvinyl alcohol resins and dichroic dyes include compounds exemplified in JP 2012-159778 A.
　上記ポリビニルアルコール系樹脂を製膜したフィルムが、偏光子の原反フィルムとして使用される。ポリビニルアルコール系樹脂を製膜する方法は特に制限されるものでなく、公知の方法で製膜することができる。ポリビニルアルコール系樹脂からなる原反フィルムの厚みは、特に制限されないが、通常１～１５０μｍである。延伸のしやすさ等も考慮すれば、その厚みは３μｍ以上であることが好ましい。 The film formed from the polyvinyl alcohol resin is used as a polarizer raw film. The method for forming a polyvinyl alcohol-based resin is not particularly limited, and can be formed by a known method. The thickness of the raw film made of polyvinyl alcohol resin is not particularly limited, but is usually 1 to 150 μm. In consideration of easiness of stretching, the thickness is preferably 3 μm or more.
　偏光子は、ポリビニルアルコール系樹脂フィルムを一軸延伸する工程；ポリビニルアルコール系樹脂フィルムを二色性色素で染色してその二色性色素を吸着させる工程；二色性色素が吸着されたポリビニルアルコール系樹脂フィルムをホウ酸水溶液で処理する工程；このホウ酸水溶液による処理後に水洗する工程；及び、乾燥工程を経て、製造することができる。偏光子の厚みは、通常２～４０μｍであり、好ましくは５～３０μｍである。 A polarizer is a step of uniaxially stretching a polyvinyl alcohol-based resin film; a step of dyeing a polyvinyl alcohol-based resin film with a dichroic dye and adsorbing the dichroic dye; a polyvinyl alcohol-based adsorbed dichroic dye The resin film can be produced through a step of treating with a boric acid aqueous solution; a step of washing with water after the treatment with the boric acid aqueous solution; and a drying step. The thickness of the polarizer is usually 2 to 40 μm, preferably 5 to 30 μm.
　偏光子は、特開２０１２－１５９７７８号公報等に記載されている方法により製造してもよい。当該文献に記載の方法においては、上記ポリビニルアルコール系樹脂からなる原反フィルムを使用せず、基材フィルムへポリビニルアルコール系樹脂をコーティングすることによってポリビニルアルコール系樹脂層を形成し、これを延伸、染色して偏光子を得ている。 The polarizer may be manufactured by a method described in JP 2012-159778 A. In the method described in the document, without using a raw film made of the polyvinyl alcohol resin, a polyvinyl alcohol resin layer is formed by coating a polyvinyl alcohol resin on a base film, A polarizer is obtained by dyeing.
［保護膜（Ａ）］
　保護膜（Ａ）は、偏光子に積層されて設けられることが好ましい。保護膜（Ａ）は、透光性を有する熱可塑性樹脂を含むことが好ましく、機械強度や熱安定性も良好な熱可塑性樹脂を含むことがよりに好ましい。熱可塑性樹脂として、鎖状ポリオレフィン系樹脂（ポリエチレン系樹脂、ポリプロピレン系樹脂等）、環状ポリオレフィン系樹脂（ノルボルネン系樹脂等）のようなポリオレフィン系樹脂；セルロースエステル系樹脂のようなセルロース系樹脂（トリアセチルセルロース、ジアセチルセルロース）；ポリエチレンテレフタレート、ポリエチレンイソフタレート、ポリブチレンテレフタレートのようなポリエステル系樹脂；（メタ）アクリル樹脂、（メタ）アクリル酸エステル系樹脂の共重合体のような（メタ）アクリル系樹脂；ポリスチレン系樹脂；ポリカーボネート系樹脂；ポリスルホン系樹脂；ポリエーテルスルホン系樹脂；ポリイミド系樹脂等を挙げることができる。保護膜は、セルロース系樹脂、（メタ）アクリル系樹脂、環状ポリオレフィン系樹脂、ポリエステル系樹脂、およびポリカーボネート系樹脂からなる群から選ばれる少なくとも一種の樹脂を含むことが好ましい。 [Protective film (A)]
The protective film (A) is preferably provided by being laminated on a polarizer. The protective film (A) preferably contains a light-transmitting thermoplastic resin, and more preferably contains a thermoplastic resin having good mechanical strength and thermal stability. As thermoplastic resins, polyolefin resins such as chain polyolefin resins (polyethylene resins, polypropylene resins, etc.), cyclic polyolefin resins (norbornene resins, etc.); cellulose resins (triesters such as cellulose ester resins) Acetylcellulose, diacetylcellulose); polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polybutylene terephthalate; (meth) acrylic resins such as copolymers of (meth) acrylic resins and (meth) acrylic ester resins Examples of the resin include polystyrene resin, polycarbonate resin, polysulfone resin, polyethersulfone resin, and polyimide resin. The protective film preferably contains at least one resin selected from the group consisting of cellulose resins, (meth) acrylic resins, cyclic polyolefin resins, polyester resins, and polycarbonate resins.
　保護膜（Ａ）は、位相差フィルム（光学補償フィルム）、輝度向上フィルムのような光学機能を併せ持つ保護膜であってもよい。位相差フィルムとしては、環状ポリオレフィン系樹脂フィルム等を一軸又は二軸延伸したフィルム、セルロース系樹脂フィルム等の上に液晶化合物を塗工、配向させたフィルムが挙げられる。また保護膜（Ａ）は、複屈折性フィルムであってもよい。さらに保護膜（Ａ）は、複数の保護膜の積層膜であってもよい。 The protective film (A) may be a protective film having both optical functions such as a retardation film (optical compensation film) and a brightness enhancement film. Examples of the retardation film include a film obtained by uniaxially or biaxially stretching a cyclic polyolefin resin film or the like, or a film obtained by coating and orienting a liquid crystal compound on a cellulose resin film or the like. The protective film (A) may be a birefringent film. Further, the protective film (A) may be a laminated film of a plurality of protective films.
　位相差フィルムの面内位相差値Ｒ０、厚み方向位相差値Ｒｔｈは、
下記式：
　Ｒ0＝（ｎx－ｎy）×ｄ
　Ｒth＝［｛（ｎx＋ｎy）／２｝－ｎz］×ｄ
で定義される。位相差フィルムの面内位相差値Ｒ0、厚み方向位相差値Ｒthは、液晶表示装置に使用される画像表示素子の種類に合わせて適切に調整される。上記式においてｎxは面内遅相軸方向の屈折率、ｎyは面内進相軸方向（面内遅相軸方向と直交する方向）の屈折率、ｎzは厚み方向の屈折率、ｄはフィルムの厚みである。画像表示素子が有機ＥＬ表示素子である場合、位相差フィルムは例えば１／４λ板等が挙げられる。
　輝度向上フィルムは、液晶表示装置等における輝度の向上を目的として使用される。輝度向上フィルムとしては、屈折率異方性が互いに異なる薄膜フィルムを複数枚積層して反射率に異方性が生じるように設計された反射型偏光分離シート、コレステリック液晶ポリマーの配向フィルムやその配向液晶層をフィルム基材上に支持した円偏光分離シート等が挙げられる。また輝度向上フィルムとしては、３Ｍ社製のＡｄｖａｎｃｅｄ　Ｐｏｌａｒｉｚｅｄ　Ｆｉｌｍ，Ｖｅｒｓｉｏｎ　３等の市販品を適用することもできる。 The in-plane retardation value R 0 of the retardation film and the thickness direction retardation value R th are:
Following formula:
R 0 = (n x −n y ) × d
R th = [{(n x + ny ) / 2} −n z ] × d
Defined by The in-plane retardation value R 0 and the thickness direction retardation value R th of the retardation film are appropriately adjusted according to the type of the image display element used in the liquid crystal display device. N x is the in-plane slow axis direction of the refractive index in the above formulas, n y is a refractive index in the in-plane fast axis direction (perpendicular to the plane slow axis direction), n z is the refractive index in the thickness direction, d is the thickness of the film. When the image display element is an organic EL display element, examples of the retardation film include a 1 / 4λ plate.
The brightness enhancement film is used for the purpose of improving brightness in a liquid crystal display device or the like. As a brightness enhancement film, a plurality of thin film films having different refractive index anisotropy are laminated to form a reflection type polarization separation sheet designed to produce anisotropy in reflectance, an alignment film of cholesteric liquid crystal polymer, and its orientation Examples thereof include a circularly polarized light separating sheet having a liquid crystal layer supported on a film substrate. Commercially available products such as Advanced Polarized Film, Version 3 manufactured by 3M may also be used as the brightness enhancement film.
　保護膜（Ａ）の厚みは、通常５～２００μｍであり、好ましくは１０～８０μｍであり、より好ましくは１０～４０μｍである。 The thickness of the protective film (A) is usually 5 to 200 μm, preferably 10 to 80 μm, more preferably 10 to 40 μm.
［保護膜（Ｂ）］
　本発明の偏光板は、偏光子、保護膜（Ａ）、およびコーティング層をこの順に含む偏光板であり、さらに偏光子におけるコーティング層から遠い側には保護膜（Ｂ）を有することが好ましい。この場合、偏光板は、保護膜（Ｂ）、偏光子、保護膜（Ａ）、およびコーティング層をこの順に有する構成である。さらに保護膜（Ｂ）は、偏光子に積層されることが好ましい。保護膜（Ｂ）としては、上記説明した保護膜（Ａ）と同様の保護膜を選択することができる。
［コーティング層］
　本発明の偏光板は、偏光子、保護膜（Ａ）、コーティング層をこの順に含むが、コーティング層は、保護膜（Ａ）に接して設けられていることが好ましい。コーティング層とは、樹脂を含む塗工液を塗布して得られる層のことをいい、コーティング層は（メタ）アクリル系樹脂から形成されることが好ましく、単層構造であってもよいし、多層構造であってもよい。コーティング層としては、防眩層、ハードコート層、低屈折率層、反射防止層、帯電防止層、防汚層、またはこれらのうち２以上の機能（特性）を兼ね備えた層が挙げられ、中でもハードコート層が好ましい。本発明の偏光板が有するコーティング層における偏光子から遠い側の面は、以下の式（１）で表される表面特性を満たす。Ｓｍは５μｍ以下であることが好ましく、４μｍ以下であることがより好ましい。通常コーティング層における偏光子から遠い側の面は、バックライトユニットと貼り合わせるための両面テープを貼り付ける面である。
（１）Ｓｍ≦１０
　式（１）において、Ｓｍはコーティング層における光源側の面の凹凸の平均間隔を表す。単位はμｍである。
　コーティング層における偏光子から遠い側の面が、上記式（１）を満たすことで、コーティング層表面が微細な表面凹凸を有するので、偏光板とバックライトユニットとを接合した後の工程内での搬送や落下等の衝撃によるコーティング層と両面テープ等の部材との間の剥がれを防止することができる。 [Protective film (B)]
The polarizing plate of this invention is a polarizing plate which contains a polarizer, a protective film (A), and a coating layer in this order, and also has a protective film (B) in the side far from the coating layer in a polarizer. In this case, the polarizing plate has a configuration including a protective film (B), a polarizer, a protective film (A), and a coating layer in this order. Furthermore, the protective film (B) is preferably laminated on the polarizer. As the protective film (B), a protective film similar to the protective film (A) described above can be selected.
[Coating layer]
Although the polarizing plate of this invention contains a polarizer, a protective film (A), and a coating layer in this order, it is preferable that the coating layer is provided in contact with the protective film (A). The coating layer refers to a layer obtained by applying a coating liquid containing a resin, and the coating layer is preferably formed from a (meth) acrylic resin, and may have a single layer structure, A multilayer structure may be used. Examples of the coating layer include an antiglare layer, a hard coat layer, a low refractive index layer, an antireflection layer, an antistatic layer, an antifouling layer, or a layer having two or more functions (characteristics). A hard coat layer is preferred. The surface far from the polarizer in the coating layer of the polarizing plate of the present invention satisfies the surface characteristics represented by the following formula (1). Sm is preferably 5 μm or less, and more preferably 4 μm or less. The surface far from the polarizer in the normal coating layer is a surface to which a double-sided tape for bonding to the backlight unit is attached.
(1) Sm ≦ 10
In the formula (1), Sm represents an average interval of the unevenness of the light source side surface in the coating layer. The unit is μm.
Since the surface of the coating layer on the side far from the polarizer satisfies the above formula (1), the surface of the coating layer has fine surface irregularities, so that the step in the process after bonding the polarizing plate and the backlight unit is performed. Peeling between the coating layer and a member such as a double-sided tape due to an impact such as conveyance or dropping can be prevented.
　凹凸の平均間隔Ｓｍは、ＪＩＳ　Ｂ　０６０１：１９９４「粗さ曲線が平均線と交差する交点から求めた山谷－周期の間隔の平均値」に規定されるパラメータであって、下記式で定義される。
Figure JPOXMLDOC01-appb-I000001
The average interval Sm of the unevenness is a parameter defined by JIS B 0601: 1994 “average value of interval between the valley and the period obtained from the intersection where the roughness curve intersects the average line”, and is defined by the following equation: .
Figure JPOXMLDOC01-appb-I000001
　Ｓｍは、市販の三次元形状測定装置や粗さ計等により測定することができる。 Sm can be measured by a commercially available three-dimensional shape measuring device, a roughness meter, or the like.
　偏光板とバックライトユニットとを接合した後の、工程内での搬送や落下等の衝撃によるコーティング層と両面テープとの間の剥れ防止効果をより高めることができるという点で、コーティング層の偏光子から遠い側の面においては、算術平均粗さＲａが５０ｎｍ以上であることが好ましい。算術平均粗さＲａは、ＪＩＳ　Ｂ　０６０１：２０１３の４．２．１に規定されるパラメータであり、基準長さにおける高さＺ（ｘ）の絶対値の平均値を意味する。 After joining the polarizing plate and the backlight unit, it is possible to further improve the peeling prevention effect between the coating layer and the double-sided tape due to impacts such as transportation in the process and dropping, etc. On the surface far from the polarizer, the arithmetic average roughness Ra is preferably 50 nm or more. The arithmetic average roughness Ra is a parameter defined in 4.2.1 of JIS B 0601: 2013, and means an average value of absolute values of the height Z (x) in the reference length.
　Ｓｍ値は、表面凹凸によって外光の写り込みやギラツキを防止するために使用される防眩フィルムの分野において適用される公知の方法により調整することができ、粒子を含む塗工液からコーティング層を形成する方法、表面凹凸が付与された型（エンボス型）を透光性樹脂の塗工層に押し当ててその表面凹凸形状を転写する方法等が挙げられる。 The Sm value can be adjusted by a known method applied in the field of an antiglare film used to prevent reflection of external light and glare due to surface irregularities, and the coating layer can be formed from a coating solution containing particles. And a method of transferring a surface uneven shape by pressing a mold (embossed mold) provided with surface unevenness onto a coating layer of a translucent resin.
　本発明の偏光板が有するＳｍの値が調節されたコーティング層としては、粒子を含むコーティング層であることが好ましい。粒子を含むコーティング層を形成する方法としては、透光性樹脂および粒子を含む塗工液を塗布する方法が挙げられる。塗工液の塗工方法は、グラビアコート法、マイクログラビアコート法、ロッドコート法、ナイフコート法、エアーナイフコート法、キスコート法、ダイコート法等が挙げられる。 The coating layer in which the Sm value of the polarizing plate of the present invention is adjusted is preferably a coating layer containing particles. Examples of the method for forming the coating layer containing particles include a method of applying a coating liquid containing a translucent resin and particles. Examples of the coating method for the coating liquid include a gravure coating method, a micro gravure coating method, a rod coating method, a knife coating method, an air knife coating method, a kiss coating method, and a die coating method.
　塗工液が含む粒子としては透光性の粒子が好ましく、（メタ）アクリル系樹脂、メラミン樹脂、ポリエチレン系樹脂、ポリスチレン系樹脂、有機シリコーン樹脂、（メタ）アクリル酸エステル－スチレン共重合体等からなる有機粒子；炭酸カルシウム、シリカ、酸化アルミニウム、炭酸バリウム、硫酸バリウム、酸化チタン、ガラス等からなる無機粒子；有機重合体のバルーン；ガラス中空ビーズが挙げられる。粒子は、１種のみを単独で使用してもよいし、２種以上を併用してもよい。なお、本明細書において、「（メタ）アクリル酸」とは、アクリル酸及びメタクリル酸よりなる群から選ばれる少なくとも１種を表す。「（メタ）アクリレート」等の表記も、同様の意味を有する。粒子の形状としては、球状、扁平状、板状、針状、不定形状等が挙げられる。 The particles contained in the coating liquid are preferably translucent particles such as (meth) acrylic resins, melamine resins, polyethylene resins, polystyrene resins, organic silicone resins, (meth) acrylic acid ester-styrene copolymers, etc. Organic particles composed of: inorganic particles composed of calcium carbonate, silica, aluminum oxide, barium carbonate, barium sulfate, titanium oxide, glass, etc .; organic polymer balloons; glass hollow beads. Only one type of particles may be used alone, or two or more types may be used in combination. In the present specification, “(meth) acrylic acid” represents at least one selected from the group consisting of acrylic acid and methacrylic acid. Notations such as “(meth) acrylate” have the same meaning. Examples of the particle shape include a spherical shape, a flat shape, a plate shape, a needle shape, and an indefinite shape.
　粒子としてはシリカ粒子がより好ましい。中でも、後述の透光性樹脂と強固な結合を形成するという点で、透光性樹脂と反応することができる重合性不飽和基を有する有機化合物で表面修飾されたシリカ粒子が特に好ましい。重合性不飽和基を有する有機化合物で表面修飾されたシリカ粒子は、シリカ粒子の表面のシラノール基に、該シラノール基と反応し得る官能基である（メタ）アクリロイル基を有する重合性不飽和基含有有機化合物を反応させることにより得ることができる。なお、本発明において、シリカ粒子の表面を修飾する重合性不飽和基を有する有機化合物は、後述の透光性樹脂に該当するものであってもよいが、シリカ粒子の表面を修飾する化合物は、シリカ粒子の構成要素として含まれるものであり、後述の透光性樹脂とは区別される。 As the particles, silica particles are more preferable. Especially, the silica particle surface-modified with the organic compound which has a polymerizable unsaturated group which can react with a translucent resin is especially preferable at the point of forming a strong bond with the below-mentioned translucent resin. Silica particles surface-modified with an organic compound having a polymerizable unsaturated group are polymerizable unsaturated groups having a (meth) acryloyl group which is a functional group capable of reacting with the silanol group on the silanol group on the surface of the silica particle. It can be obtained by reacting the contained organic compound. In the present invention, the organic compound having a polymerizable unsaturated group for modifying the surface of the silica particles may correspond to a translucent resin described later, but the compound for modifying the surface of the silica particles is And is included as a constituent element of silica particles, and is distinguished from a light-transmitting resin described later.
　前記シラノール基と反応し得る官能基を有する重合性不飽和基含有有機化合物としては、下記式（Ｉ）で表される化合物が挙げられる。
Figure JPOXMLDOC01-appb-I000002
（式中、Ｒ１は水素原子又はメチル基を表し、Ｒ２はハロゲン原子又は下記式で表される基を表す。） Examples of the polymerizable unsaturated group-containing organic compound having a functional group capable of reacting with the silanol group include compounds represented by the following formula (I).
Figure JPOXMLDOC01-appb-I000002
(In the formula, R 1 represents a hydrogen atom or a methyl group, and R 2 represents a halogen atom or a group represented by the following formula.)
Figure JPOXMLDOC01-appb-I000003
Figure JPOXMLDOC01-appb-I000003
　式（Ｉ）で表される化合物としては、（メタ）アクリル酸、（メタ）アクリル酸クロリド、（メタ）アクリル酸２－イソシアナートエチル、（メタ）アクリル酸グリシジル、（メタ）アクリル酸２，３－イミノプロピル、（メタ）アクリル酸２－ヒドロキシエチル、（メタ）アクリロイルオキシプロピルトリメトキシシラン等の（メタ）アクリル酸誘導体が挙げられる。シリカ粒子の表面を修飾する重合性不飽和基を有する有機化合物は、単独で使用してもよいし、２種以上を組み合わせて使用してもよい。 Examples of the compound represented by the formula (I) include (meth) acrylic acid, (meth) acrylic acid chloride, 2-isocyanatoethyl (meth) acrylate, glycidyl (meth) acrylate, (meth) acrylic acid 2, Examples include (meth) acrylic acid derivatives such as 3-iminopropyl, 2-hydroxyethyl (meth) acrylate, and (meth) acryloyloxypropyltrimethoxysilane. The organic compound having a polymerizable unsaturated group that modifies the surface of the silica particles may be used alone or in combination of two or more.
　粒子の含有量としては、後述の透光性樹脂１００重量部に対して、通常３～６０重量部であり、好ましくは３～５０重量部である。粒子の含有量が６０重量部を超えると、得られるコーティング層の透明性が損なわれることがある。また、偏光板を画像表示装置に適用した場合に、光散乱強度が強すぎるため、例えば、黒表示において画像表示装置の正面方向に対して斜めに漏れ出してくる光がコーティング層によって正面方向へ強く散乱されてしまい、コントラストを低下させることもある。また、粒子の重量平均粒子径は、１ｎｍ～１μｍであることが好ましく、１～５０ｎｍであることがより好ましく、１～２０ｎｍであることがさらに好ましい。重量平均粒子径は、走査型トンネル顕微鏡により測定することができる。 The content of the particles is usually 3 to 60 parts by weight, preferably 3 to 50 parts by weight with respect to 100 parts by weight of the light-transmitting resin described later. When the content of the particles exceeds 60 parts by weight, the transparency of the resulting coating layer may be impaired. Further, when the polarizing plate is applied to the image display device, the light scattering intensity is too strong. For example, in the black display, light leaking obliquely with respect to the front direction of the image display device is directed to the front direction by the coating layer. It may be strongly scattered, reducing the contrast. Further, the weight average particle diameter of the particles is preferably 1 nm to 1 μm, more preferably 1 to 50 nm, and further preferably 1 to 20 nm. The weight average particle diameter can be measured with a scanning tunneling microscope.
　塗工液が含む透光性樹脂としては、紫外線硬化性樹脂や電子線硬化性樹脂のような活性エネルギー線硬化性樹脂、熱硬化性樹脂、熱可塑性樹脂、金属アルコキシドが挙げられる。高い硬度及び耐擦傷性を付与できるという点で、活性エネルギー線硬化性樹脂が好ましい。 Examples of the translucent resin contained in the coating liquid include an active energy ray curable resin such as an ultraviolet curable resin and an electron beam curable resin, a thermosetting resin, a thermoplastic resin, and a metal alkoxide. An active energy ray-curable resin is preferable in that high hardness and scratch resistance can be imparted.
　活性エネルギー線硬化性樹脂としては、多価アルコールの（メタ）アクリル酸エステルのような多官能（メタ）アクリレート；ジイソシアネートと多価アルコールとの反応によって得られる末端イソシアナト基ウレタンプレポリマーに（メタ）アクリル酸のヒドロキシアルキルエステルを反応させることにより得られるもののような多官能のウレタン（メタ）アクリレートを含む。これらの他、（メタ）アクリレート系の官能基を有するポリエーテル樹脂、ポリエステル樹脂、エポキシ樹脂、アルキッド樹脂、スピロアセタール樹脂、ポリブタジエン樹脂、ポリチオールポリエン樹脂等も活性エネルギー線硬化性樹脂となり得る。 Active energy ray curable resins include polyfunctional (meth) acrylates such as (meth) acrylic acid esters of polyhydric alcohols; terminal isocyanato group urethane prepolymers obtained by reaction of diisocyanates with polyhydric alcohols (meth) Polyfunctional urethane (meth) acrylates such as those obtained by reacting hydroxyalkyl esters of acrylic acid are included. Besides these, polyether resins having a (meth) acrylate functional group, polyester resins, epoxy resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, and the like can also be active energy ray curable resins.
　熱硬化性樹脂としては、アクリルポリオールとイソシアネートプレポリマーとからなる熱硬化型ウレタン樹脂の他、フェノール樹脂、尿素メラミン樹脂、エポキシ樹脂、不飽和ポリエステル樹脂、シリコーン樹脂等が挙げられる。 Examples of the thermosetting resin include a phenol resin, a urea melamine resin, an epoxy resin, an unsaturated polyester resin, and a silicone resin, in addition to a thermosetting urethane resin composed of an acrylic polyol and an isocyanate prepolymer.
　熱可塑性樹脂としては、アセチルセルロース、ニトロセルロース、アセチルブチルセルロース、エチルセルロース、メチルセルロースのようなセルロース誘導体；酢酸ビニルの単独重合体又は共重合体、塩化ビニルの単独重合体又は共重合体、塩化ビニリデンの単独重合体又は共重合体のようなビニル系樹脂；ポリビニルホルマール、ポリビニルブチラールのようなアセタール系樹脂；（メタ）アクリル樹脂、（メタ）アクリル酸エステル系共重合体のような（メタ）アクリル系樹脂；ポリスチレン系樹脂；ポリアミド系樹脂；ポリエステル系樹脂；ポリカーボネート系樹脂等が挙げられる。 Thermoplastic resins include cellulose derivatives such as acetylcellulose, nitrocellulose, acetylbutylcellulose, ethylcellulose, and methylcellulose; vinyl acetate homopolymers or copolymers, vinyl chloride homopolymers or copolymers, vinylidene chloride Vinyl resins such as homopolymers or copolymers; acetal resins such as polyvinyl formal and polyvinyl butyral; (meth) acrylic resins such as (meth) acrylic resins and (meth) acrylic acid ester copolymers Examples of resins include polystyrene resins, polyamide resins, polyester resins, and polycarbonate resins.
　金属アルコキシドとしては、アルコキシシラン系の材料を使用することができ、金属アルコキシドは加水分解や脱水縮合により酸化珪素系等のマトリックスを形成する。テトラメトキシシラン、テトラエトキシシラン等が挙げられる。 As the metal alkoxide, an alkoxysilane-based material can be used, and the metal alkoxide forms a silicon oxide-based matrix by hydrolysis or dehydration condensation. Examples include tetramethoxysilane and tetraethoxysilane.
　上記透光性樹脂のうち、活性エネルギー線硬化性樹脂や熱硬化性樹脂（いずれも硬化前のもの）は液体状態であり、また金属アルコキシドは多くの場合液体である。液体状態の樹脂は、そのままコーティング層を形成するための塗工液として使用することができるが、必要により、溶媒等により希釈した状態で塗工液としてもよい。一方、熱可塑性樹脂のような固体で用意される樹脂は、通常適当な溶媒に溶かした状態で塗工液とすることが好ましい。活性エネルギー線硬化性樹脂、熱硬化性樹脂、金属アルコキシド又は熱可塑性樹脂を含む塗工液は、レベリング剤や分散剤のような適宜の添加剤を含んでいてもよい。 Of the translucent resins, active energy ray curable resins and thermosetting resins (both before curing) are in a liquid state, and metal alkoxides are often liquid. The liquid resin can be used as it is as a coating liquid for forming a coating layer, but if necessary, it may be diluted with a solvent or the like as a coating liquid. On the other hand, a resin prepared as a solid such as a thermoplastic resin is preferably used as a coating solution in a state where it is usually dissolved in an appropriate solvent. The coating liquid containing an active energy ray curable resin, a thermosetting resin, a metal alkoxide, or a thermoplastic resin may contain an appropriate additive such as a leveling agent or a dispersant.
　塗工液が活性エネルギー線硬化性樹脂を含む場合、塗工液は光重合開始剤を含有する。
光重合開始剤としては、ベンゾイン、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインイソプロピルエーテル、ベンゾイン－ｎ－ブチルエーテル、ベンゾインイソブチルエーテル、アセトフェノン、ジメチルアミノアセトフェノン、２，２－ジメトキシ－２－フェニルアセトフェノン、２，２－ジエトキシ－２－フェニルアセトフェノン、２－ヒドロキシ－２－メチル－１－フェニルプロパン－１－オン、１－ヒドロキシシクロヘキシルフェニルケトン、２－メチル－１－［４－（メチルチオ）フェニル］－２－モルフォリノ－プロパン－１－オン、４－（２－ヒドロキシエトキシ）フェニル－２（ヒドロキシ－２－プロピル）ケトン、ベンゾフェノン、ｐ－フェニルベンゾフェノン、４，４’－ジエチルアミノベンゾフェノン、ジクロロベンゾフェノン、２－メチルアントラキノン、２－エチルアントラキノン、２－ターシャリ－ブチルアントラキノン、２－アミノアントラキノン、２－メチルチオキサントン、２－エチルチオキサントン、２－クロロチオキサントン、２，４－ジメチルチオキサントン、２，４－ジエチルチオキサントン、ベンジルジメチルケタール、アセトフェノンジメチルケタール、ｐ－ジメチルアミノ安息香酸エステル等が挙げられる。なお、これらの光重合開始剤は、単独で使用してもよいし、２種以上を組み合わせて使用してもよい。 When the coating liquid contains an active energy ray-curable resin, the coating liquid contains a photopolymerization initiator.
As photopolymerization initiators, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2, 2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2- Morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzofe Non, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2 , 4-diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoate, and the like. In addition, these photoinitiators may be used independently and may be used in combination of 2 or more type.
　塗工液が活性エネルギー線硬化性樹脂を含む場合、塗工液は、紫外線吸収剤を含有してもよい。紫外線吸収剤としては、ベンゾトリアゾール系紫外線吸収剤、ヒンダードアミン系紫外線吸収剤、ベンゾフェノン系紫外線吸収剤、トリアジン系紫外線吸収剤等が挙げられる。紫外線吸収剤は、単独で使用してもよいし、２種以上を組み合わせて使用してもよい。分子内にラジカル重合性の二重結合を有するラジカル重合性紫外線吸収剤が好ましい。 When the coating liquid contains an active energy ray-curable resin, the coating liquid may contain an ultraviolet absorber. Examples of the UV absorber include benzotriazole UV absorbers, hindered amine UV absorbers, benzophenone UV absorbers, and triazine UV absorbers. An ultraviolet absorber may be used independently and may be used in combination of 2 or more type. A radical polymerizable ultraviolet absorber having a radical polymerizable double bond in the molecule is preferred.
　塗工液が活性エネルギー線硬化性樹脂を含む場合、塗工液は、光安定剤を含有してもよい。光安定剤としては、ヒンダードアミン系光安定剤、ベンゾフェノン系光安定剤、ベンゾトリアゾール系光安定剤等が挙げられる。光安定剤は、単独で使用してもよいし、２種以上を組み合わせて使用してもよい。 When the coating liquid contains an active energy ray-curable resin, the coating liquid may contain a light stabilizer. Examples of light stabilizers include hindered amine light stabilizers, benzophenone light stabilizers, and benzotriazole light stabilizers. A light stabilizer may be used independently and may be used in combination of 2 or more type.
　コーティング層が保護膜（Ａ）に接して設けられている場合、塗工液の塗工性の改良または得られる塗工層と保護膜（Ａ）の接着性の改良を目的として、保護膜におけるコーティング層を形成するための塗工が塗工される面には各種表面処理を施してもよい。表面処理は、コロナ放電処理、グロー放電処理、酸表面処理、アルカリ表面処理、紫外線照射処理等が挙げられる。 In the case where the coating layer is provided in contact with the protective film (A), for the purpose of improving the coating property of the coating liquid or improving the adhesion between the resulting coating layer and the protective film (A), Various surface treatments may be applied to the surface on which the coating for forming the coating layer is applied. Examples of the surface treatment include corona discharge treatment, glow discharge treatment, acid surface treatment, alkali surface treatment, and ultraviolet irradiation treatment.
　またコーティング層の透過率は、８０％以上であることが好ましく、９５％以上であることがより好ましい。ここでいう透過率とは、３８０～７８０ｎｍの波長の光に対する透過率であって、視感度補正を施した透過率をいう。本発明によれば、コーティング層の透光性と両面テープへの密着性とを両立することができる。 Further, the transmittance of the coating layer is preferably 80% or more, and more preferably 95% or more. The transmissivity here refers to the transmissivity with respect to light having a wavelength of 380 to 780 nm, and the transmissivity subjected to visibility correction. According to the present invention, both the translucency of the coating layer and the adhesion to the double-sided tape can be achieved.
　コーティング層の鉛筆硬度は、好ましくはＢ以上であり、より好ましくはＦ以上であり、さらに好ましくは２Ｈ以上であり、通常９Ｈ以下である。鉛筆硬度は、ＪＩＳ　Ｋ５６００－５－４：１９９９「塗料一般試験方法－第５部：塗膜の機械的性質－第４節：引っかき硬度（鉛筆法）」に規定される鉛筆硬度試験に従って測定することができる。液晶表示装置においてバックライトユニットとコーティング層を有する偏光板とは非常に近接して配置されることがあり、コーティング層の鉛筆硬度をＢ以上とすることでバックライトユニットがコーティング層に接触しても偏光板の表面に傷が付くのを防ぐことができる。 The pencil hardness of the coating layer is preferably B or more, more preferably F or more, still more preferably 2H or more, and usually 9H or less. The pencil hardness is measured in accordance with the pencil hardness test specified in JIS K5600-5-4: 1999 “General test method for paints—Part 5: Mechanical properties of coating film—Section 4: Scratch hardness (pencil method)”. be able to. In the liquid crystal display device, the backlight unit and the polarizing plate having the coating layer may be arranged very close to each other, and the backlight unit comes into contact with the coating layer by setting the pencil hardness of the coating layer to B or more. Can also prevent the surface of the polarizing plate from being scratched.
［偏光板］
　本発明の偏光板の構成例を図１および３～５を参照して説明する。
　図１において偏光板１０は、偏光子１３とコーティング層１６とを有し、偏光子１３とコーティング層１６との間には保護膜（Ａ）１４を有し、偏光子におけるコーティング層から遠い側の面に保護膜（Ｂ）１５を有している。また偏光板１０は、画像表示素子２０と偏光板とを貼合するために、保護膜１５のコーティング層から遠い側の面に粘着剤層１７が積層された粘着剤層付き偏光板である。 [Polarizer]
A configuration example of the polarizing plate of the present invention will be described with reference to FIGS. 1 and 3 to 5.
In FIG. 1, a polarizing plate 10 includes a polarizer 13 and a coating layer 16, a protective film (A) 14 is provided between the polarizer 13 and the coating layer 16, and a side of the polarizer far from the coating layer. The protective film (B) 15 is provided on the surface. The polarizing plate 10 is a polarizing plate with an adhesive layer in which an adhesive layer 17 is laminated on the surface of the protective film 15 far from the coating layer in order to bond the image display element 20 and the polarizing plate.
　保護膜（Ａ）、または保護膜（Ｂ）と偏光子とを貼合させるには、図１には図示していない粘接着剤層を介して保護膜と偏光子とを貼合させる方法が挙げられる。 In order to bond the protective film (A) or the protective film (B) and the polarizer, a method of bonding the protective film and the polarizer through an adhesive layer not shown in FIG. Is mentioned.
　接着剤としては、ポリビニルアルコール系樹脂やウレタン樹脂を主成分として含む水系接着剤、紫外線硬化性樹脂（エポキシ系樹脂等）のような光硬化性樹脂を含む光硬化性接着剤が挙げられる。粘着剤としては、アクリル系重合体、シリコーン系ポリマー、ポリエステル、ポリウレタン、ポリエーテル等をベースポリマーとする粘着剤が挙げられる。粘着剤には、光散乱性を示す粒子、ガラス繊維、ガラスビーズ、樹脂ビーズ、金属粉やその他の無機粉末のような充填剤、顔料、着色剤、酸化防止剤、紫外線吸収剤等を含有していてもよい。貼合に先立って、偏光子および／または保護膜の貼合面に、ケン化処理、コロナ処理、プライマー処理、アンカーコーティング処理等の易接着処理を施してもよい。 Examples of the adhesive include a water-based adhesive containing a polyvinyl alcohol-based resin or a urethane resin as a main component, and a photo-curable adhesive including a photo-curable resin such as an ultraviolet curable resin (such as an epoxy-based resin). Examples of the pressure-sensitive adhesive include pressure-sensitive adhesives based on acrylic polymers, silicone polymers, polyesters, polyurethanes, polyethers, and the like. The adhesive contains light scattering particles, glass fibers, glass beads, resin beads, fillers such as metal powder and other inorganic powders, pigments, colorants, antioxidants, ultraviolet absorbers, etc. It may be. Prior to the bonding, the bonding surface of the polarizer and / or the protective film may be subjected to easy adhesion treatment such as saponification treatment, corona treatment, primer treatment, anchor coating treatment and the like.
　図３において偏光板５０は、図１に示す偏光板における保護膜（Ａ）１４として輝度向上フィルム５４を使用した偏光板を表す。 3, a polarizing plate 50 represents a polarizing plate using a brightness enhancement film 54 as the protective film (A) 14 in the polarizing plate shown in FIG.
　図４において偏光板６０は、偏光子６３とコーティング層６９とを有し、偏光子６３とコーティング層６９との間には、偏光子に近い側から、保護膜６８および輝度向上フィルム６４を有し、合わせて保護膜（Ａ）を形成している。さらに偏光子におけるコーティング層から遠い側の面に保護膜（Ｂ）６５を有している。保護膜６８と輝度向上フィルム６４とは、粘接着剤層６６を介して貼合されている。また偏光板６０は、画像表示素子２０と偏光板とを貼合するために、保護膜（Ｂ）６５のコーティング層から遠い側の面に粘着剤層６７が積層された粘着剤層付き偏光板である。なお、偏光子と保護膜（Ａ）、（Ｂ）とを貼合する粘接着剤層は図示していない。 In FIG. 4, a polarizing plate 60 has a polarizer 63 and a coating layer 69, and a protective film 68 and a brightness enhancement film 64 are provided between the polarizer 63 and the coating layer 69 from the side close to the polarizer. In combination, a protective film (A) is formed. Further, a protective film (B) 65 is provided on the surface of the polarizer far from the coating layer. The protective film 68 and the brightness enhancement film 64 are bonded via an adhesive layer 66. Further, the polarizing plate 60 is a polarizing plate with an adhesive layer in which an adhesive layer 67 is laminated on a surface far from the coating layer of the protective film (B) 65 in order to bond the image display element 20 and the polarizing plate. It is. In addition, the adhesive agent layer which bonds a polarizer and protective film (A) and (B) is not illustrated.
　図５において偏光板７０は、偏光子７３とコーティング層７７とを有し、偏光子７３とコーティング層７７との間には、偏光子に近い側から、保護膜７４および輝度向上フィルム７５を有し、合わせて保護膜（Ａ）を形成している。保護膜７４と輝度向上フィルム７５とは、粘接着剤層７６を介して貼合されている。また偏光板７０は、画像表示素子２０と偏光板とを貼合するために、偏光子７３のコーティング層から遠い側の面に粘着剤層７２が積層された粘着剤層付き偏光板である。なお、偏光子と保護膜（Ａ）とを貼合する粘接着剤層は図示していない。 In FIG. 5, a polarizing plate 70 has a polarizer 73 and a coating layer 77, and a protective film 74 and a brightness enhancement film 75 are provided between the polarizer 73 and the coating layer 77 from the side close to the polarizer. In combination, a protective film (A) is formed. The protective film 74 and the brightness enhancement film 75 are bonded via an adhesive layer 76. The polarizing plate 70 is a polarizing plate with a pressure-sensitive adhesive layer in which a pressure-sensitive adhesive layer 72 is laminated on a surface far from the coating layer of the polarizer 73 in order to bond the image display element 20 and the polarizing plate. In addition, the adhesive layer which bonds a polarizer and a protective film (A) is not illustrated.
［液晶表示装置］
　本発明の偏光板は、液晶表示装置等の各種装置に好ましく使用することができ、透過型や半透過型の液晶表示装置に特に好ましく使用することができる。液晶表示装置等を形成する画像表示素子としては、VAモード、IPSモード、TNモード、FFSモード、AFFSモード、OCBモード、ブルー相の液晶使用した液晶駆動モードなどの画像表示素子が挙げられる。
さらに、液晶表示装置には、画像表示素子、本発明の偏光板の以外に、プリズムアレイシート、レンズアレイシート、光拡散板、バックライト等の液晶表示装置で使用される公知の部材を設けることができる。
本発明の偏光板を液晶表示装置に使用する場合、本発明の偏光板を画像表示素子のバックライト側に設置することが好ましく、偏光板中のコーティング層がバックライトに最も近い層となるように設置することがより好ましい。また、本発明の偏光版を画像表示素子の両側に設置してもよい。
　図２を参照して本発明の偏光板を有する液晶表示装置の構成の一例を説明する。
画像表示素子２０のバックライト側には、粘着剤付き偏光板１０が粘着剤層１７を介して貼合されている。さらに粘着剤付き偏光板１０のコーティング層１６とバックライトユニット４０とが、両面テープ４１により貼り合わされている。バックライトは、光源（図示していない）、導光板４２、およびプリズムアレイシート４３を備えている。 [Liquid Crystal Display]
The polarizing plate of the present invention can be preferably used for various devices such as a liquid crystal display device, and can be particularly preferably used for a transmissive or transflective liquid crystal display device. Examples of image display elements forming a liquid crystal display device include VA mode, IPS mode, TN mode, FFS mode, AFFS mode, OCB mode, and liquid crystal driving mode using a liquid crystal of blue phase.
Furthermore, in addition to the image display element and the polarizing plate of the present invention, the liquid crystal display device is provided with known members used in liquid crystal display devices such as a prism array sheet, a lens array sheet, a light diffusion plate, and a backlight. Can do.
When the polarizing plate of the present invention is used in a liquid crystal display device, the polarizing plate of the present invention is preferably installed on the backlight side of the image display element, so that the coating layer in the polarizing plate is the layer closest to the backlight. It is more preferable to install in the. The polarizing plate of the present invention may be installed on both sides of the image display element.
An example of the configuration of a liquid crystal display device having the polarizing plate of the present invention will be described with reference to FIG.
A polarizing plate 10 with an adhesive is bonded to the backlight side of the image display element 20 via an adhesive layer 17. Furthermore, the coating layer 16 of the polarizing plate with an adhesive 10 and the backlight unit 40 are bonded together by a double-sided tape 41. The backlight includes a light source (not shown), a light guide plate 42, and a prism array sheet 43.
　以下に実施例を示して、本発明をさらに具体的に説明するが、本発明はこれらの例によって限定されるものではない。例中、含有量ないし使用量を表す％及び部は、特記ない限り重量基準である。 Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. In the examples, “%” and “part” representing the content or amount used are based on weight unless otherwise specified.
［製造例１］
　厚み４０μｍのトリアセチルセルロースフィルム〔コニカミノルタオプト（株）製の商品名「ＫＣ４ＵＹ」〕を使用した。トリアセチルセルロースフィルムの片面に特開平9-100111に記載の重合性不飽和基を有する有機化合物で表面修飾されたシリカ粒子（重量平均粒子径は、１～２０ｎｍであった。）を新中村化学工業（株）より入手したアクリル系ハードコート樹脂2種類（品名；A-DCP、UA-1100H）と混合したものをバーコーターにより塗工し、80℃の恒温槽で1分間乾燥させた。Ｆｕｓｉｏｎ　ＵＶ　Ｓｙｓｔｅｍｓ社製の紫外線照射システム及び専用のＤバルブにより、ラインスピード９．６、バルブ高さ４５ｍｍ、ＵＶ出力を６５％に設定した後、塗工面側から照射量３５０ｍＪ／ｃｍ２の条件で紫外線を照射して、コーティング層としてハードコート層を形成し、ハードコート層を有するトリアセチルセルロースフィルムを得た。ハードコート層の鉛筆硬度を測定したところ、Ｆであった。 [Production Example 1]
A triacetyl cellulose film [trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.] having a thickness of 40 μm was used. Shin-Nakamura Chemical Co., Ltd. produced silica particles (weight average particle diameter of 1 to 20 nm) surface-modified with an organic compound having a polymerizable unsaturated group described in JP-A-9-100111 on one side of a triacetyl cellulose film. A mixture of two types of acrylic hard coat resins (product name: A-DCP, UA-1100H) obtained from Kogyo Co., Ltd. was applied by a bar coater and dried in a constant temperature bath at 80 ° C. for 1 minute. After setting the line speed 9.6, the valve height 45mm, and the UV output 65% by the UV irradiation system made by Fusion UV Systems and the dedicated D bulb, the irradiation amount 350mJ / cm 2 from the coated surface side Ultraviolet rays were irradiated to form a hard coat layer as a coating layer, and a triacetyl cellulose film having a hard coat layer was obtained. It was F when the pencil hardness of the hard coat layer was measured.
［製造例２］
　輝度向上フィルム（３Ｍ社製のＡｄｖａｎｃｅｄ　Ｐｏｌａｒｉｚｅｄ　Ｆｉｌｍ，Ｖｅｒｓｉｏｎ　３）を使用した。前記輝度向上フィルムのポリカーボネート面に製造例１と同様の手法により、コーティング層としてハードコート層を形成し、ハードコート層を有する輝度向上フィルムを得た。ハードコート層の鉛筆硬度を測定したところ、Ｆであった。 [Production Example 2]
A brightness enhancement film (Advanced Polarized Film, Version 3 manufactured by 3M) was used. A hard coat layer was formed as a coating layer on the polycarbonate surface of the brightness enhancement film in the same manner as in Production Example 1 to obtain a brightness enhancement film having a hard coat layer. It was F when the pencil hardness of the hard coat layer was measured.
［製造例３］
　輝度向上フィルム（３Ｍ社製のＡｄｖａｎｃｅｄ　Ｐｏｌａｒｉｚｅｄ　Ｆｉｌｍ，Ｖｅｒｓｉｏｎ　３）を使用した。前記輝度向上フィルムのポリカーボネート面に製造例１に記載の条件からＵＶ出力を６０％、照射量２９０ｍＪ／ｃｍ２に変更したこと以外は同様の手法により、コーティング層としてハードコート層を形成し、ハードコート層を有する輝度向上フィルムを得た。ハードコート層の鉛筆硬度を測定したところ、ＨＢであった。 [Production Example 3]
A brightness enhancement film (Advanced Polarized Film, Version 3 manufactured by 3M) was used. A hard coat layer was formed as a coating layer on the polycarbonate surface of the brightness enhancement film by the same method except that the UV output was changed to 60% and the irradiation amount was 290 mJ / cm 2 from the conditions described in Production Example 1. A brightness enhancement film having a coating layer was obtained. It was HB when the pencil hardness of the hard coat layer was measured.
［製造例４］
　輝度向上フィルム（３Ｍ社製のＡｄｖａｎｃｅｄ　Ｐｏｌａｒｉｚｅｄ　Ｆｉｌｍ，Ｖｅｒｓｉｏｎ　３）を使用した。前記輝度向上フィルムのポリカーボネート面に製造例１に記載の条件からＵＶ出力を５５％、照射量２３０ｍＪ／ｃｍ２に変更したこと以外は同様の手法により、コーティング層としてハードコート層を形成し、ハードコート層を有する輝度向上フィルムを得た。ハードコート層の鉛筆硬度を測定したところ、Ｂであった。 [Production Example 4]
A brightness enhancement film (Advanced Polarized Film, Version 3 manufactured by 3M) was used. A hard coat layer was formed as a coating layer on the polycarbonate surface of the brightness enhancement film by the same method except that the UV output was changed to 55% and the irradiation amount was 230 mJ / cm 2 from the conditions described in Production Example 1. A brightness enhancement film having a coating layer was obtained. It was B when the pencil hardness of the hard coat layer was measured.
［実施例１］
　厚み３０μｍのポリビニルアルコールフィルム（平均重合度約２４００、ケン化度９９．９モル％以上）を、乾式延伸により約５倍に一軸延伸し、さらに緊張状態を保ったまま、６０℃の純水に１分間浸漬した後、水１００部に対して、ヨウ素０．０５部、およびヨウ化カリウム５部を含有する水溶液に２８℃で６０秒間浸漬した。水１００部に対して、ヨウ化カリウム８．５部およびホウ酸８．５部を含有する水溶液に７２℃で３００秒間浸漬した。引き続き２６℃の純水で２０秒間洗浄した後、６５℃で乾燥し、ポリビニルアルコールフィルムにヨウ素が吸着配向された厚み１１μｍの偏光子を得た。
　次に、得られた偏光子の一方の面に、水１００部に対して、カルボキシル基変性ポリビニルアルコール（（株）クラレから入手した商品名「ＫＬ－３１８」）を３部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤（田岡化学工業（株）製の商品名「スミレーズレジン　６５０（３０）」、固形分濃度３０％の水溶液）を１．５部添加した水系のエポキシ系接着剤を塗布し、保護膜（Ｂ）として厚み２３μｍのシクロオレフィン系樹脂からなる延伸されていないフィルム（日本ゼオン（株）製の商品名「ＺＥＯＮＯＲ」）を貼合した。偏光子のもう一方の面には、粘着剤（リンテック（株）製の商品名「♯ＫＺ」、アクリル系粘着剤）を塗布して、厚み２０μｍの粘着剤層を形成した。前記粘着剤層を介して、製造例１で得られたハードコート層を有するトリアセチルセルロースフィルムと偏光子とを、ハードコート層が偏光板の最表面になるように貼合して、偏光板を得た。 [Example 1]
A 30 μm-thick polyvinyl alcohol film (average polymerization degree of about 2400, saponification degree of 99.9 mol% or more) was uniaxially stretched about 5 times by dry stretching, and further kept in a pure water at 60 ° C. while maintaining tension. After being immersed for 1 minute, it was immersed in an aqueous solution containing 0.05 part of iodine and 5 parts of potassium iodide for 60 seconds at 28 ° C. with respect to 100 parts of water. 100 parts of water was immersed in an aqueous solution containing 8.5 parts of potassium iodide and 8.5 parts of boric acid at 72 ° C. for 300 seconds. Subsequently, the film was washed with pure water at 26 ° C. for 20 seconds and then dried at 65 ° C. to obtain a 11 μm thick polarizer in which iodine was adsorbed and oriented on a polyvinyl alcohol film.
Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%). An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 μm was bonded as a protective film (B). An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 μm. Through the pressure-sensitive adhesive layer, the triacetyl cellulose film having the hard coat layer obtained in Production Example 1 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Got.
［実施例２］
　実施例１と同様にして、偏光子を得た。
　次に、得られた偏光子の一方の面に、水１００部に対して、カルボキシル基変性ポリビニルアルコール（（株）クラレから入手した商品名「ＫＬ－３１８」）を３部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤（田岡化学工業（株）製の商品名「スミレーズレジン　６５０（３０）」、固形分濃度３０％の水溶液）を１．５部添加した水系のエポキシ系接着剤を塗布し、保護膜（Ｂ）として厚み２３μｍのシクロオレフィン系樹脂からなる延伸されていないフィルム（日本ゼオン（株）製の商品名「ＺＥＯＮＯＲ」）を貼合した。偏光子のもう一方の面には、粘着剤（リンテック（株）製の商品名「♯ＫＺ」、アクリル系粘着剤）を塗布して、厚み２０μｍの粘着剤層を形成した。前記粘着剤層を介して、製造例２で得られたハードコート層を有する輝度向上フィルムと偏光子とを、ハードコート層が偏光板の最表面になるように貼合して、偏光板を得た。 [Example 2]
A polarizer was obtained in the same manner as in Example 1.
Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%). An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 μm was bonded as a protective film (B). An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 μm. Through the pressure-sensitive adhesive layer, the brightness enhancement film having the hard coat layer obtained in Production Example 2 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Obtained.
［実施例３］
　実施例１と同様にして、偏光子を得た。
　次に、得られた偏光子の一方の面に、水１００部に対して、カルボキシル基変性ポリビニルアルコール（（株）クラレから入手した商品名「ＫＬ－３１８」）を３部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤（田岡化学工業（株）製の商品名「スミレーズレジン　６５０（３０）」、固形分濃度３０％の水溶液）を１．５部添加した水系のエポキシ系接着剤を塗布し、保護膜（Ｂ）として厚み２３μｍのシクロオレフィン系樹脂からなる延伸されていないフィルム（日本ゼオン（株）製の商品名「ＺＥＯＮＯＲ」）を貼合した。偏光子のもう一方の面には、粘着剤（リンテック（株）製の商品名「♯ＫＺ」、アクリル系粘着剤）を塗布して、厚み２０μｍの粘着剤層を形成した。前記粘着剤層を介して、保護膜として厚み４０μｍのトリアセチルセルロースフィルム（コニカミノルタオプト（株）製の商品名「ＫＣ４ＵＹ」）と偏光子とを貼合した。該トリアセチルセルロースフィルムに、粘着剤（リンテック（株）製の商品名「♯L2」、アクリル系粘着剤）を塗布し、厚み５μｍの粘着剤層を形成した。前記粘着剤層を介して、製造例２で得られたハードコート層を有する輝度向上フィルムを、ハードコート層が偏光板の最表面になるように貼合して、偏光板を得た。この場合、保護膜（Ａ）は、トリアセチルセルロースフィルムと輝度向上フィルムとの積層膜である。 [Example 3]
A polarizer was obtained in the same manner as in Example 1.
Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%). An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 μm was bonded as a protective film (B). An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 μm. A 40 μm-thick triacetyl cellulose film (trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.) and a polarizer were bonded as a protective film through the pressure-sensitive adhesive layer. An adhesive (trade name “# L2” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the triacetyl cellulose film to form an adhesive layer having a thickness of 5 μm. Through the pressure-sensitive adhesive layer, the brightness enhancement film having the hard coat layer obtained in Production Example 2 was bonded so that the hard coat layer was the outermost surface of the polarizing plate to obtain a polarizing plate. In this case, the protective film (A) is a laminated film of a triacetyl cellulose film and a brightness enhancement film.
［実施例４］
　実施例１と同様にして、偏光子を得た。
　次に、得られた偏光子の一方の面に、水１００部に対して、カルボキシル基変性ポリビニルアルコール（（株）クラレから入手した商品名「ＫＬ－３１８」）を３部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤（田岡化学工業（株）製の商品名「スミレーズレジン　６５０（３０）」、固形分濃度３０％の水溶液）を１．５部添加した水系のエポキシ系接着剤を塗布し、保護膜として厚み４０μｍのトリアセチルセルロースフィルム（コニカミノルタオプト（株）製の商品名「ＫＣ４ＵＹ」）を貼合した。該トリアセチルセルロースフィルムに、粘着剤（リンテック（株）製の商品名「♯L2」、アクリル系粘着剤）を塗布し、厚み５μｍの粘着剤層を形成した。前記粘着剤層を介して、製造例２で得られたハードコート層を有する輝度向上フィルムを、ハードコート層が偏光板の最表面になるように貼合した。さらに、偏光子のもう一方の面には、粘着剤（リンテック（株）製の商品名「♯ＫＺ」、アクリル系粘着剤）を塗布し、厚み２０μｍの粘着剤層を形成して、偏光板を得た。この場合、保護膜（Ａ）は、トリアセチルセルロースフィルムと輝度向上フィルムとの積層膜である。 [Example 4]
A polarizer was obtained in the same manner as in Example 1.
Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%). An epoxy adhesive was applied, and a 40 μm thick triacetyl cellulose film (trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.) was bonded as a protective film. An adhesive (trade name “# L2” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the triacetyl cellulose film to form an adhesive layer having a thickness of 5 μm. The brightness enhancement film having the hard coat layer obtained in Production Example 2 was bonded via the pressure-sensitive adhesive layer so that the hard coat layer became the outermost surface of the polarizing plate. Further, a pressure-sensitive adhesive (trade name “#KZ” manufactured by Lintec Corporation, acrylic pressure-sensitive adhesive) was applied to the other surface of the polarizer to form a pressure-sensitive adhesive layer having a thickness of 20 μm. Got. In this case, the protective film (A) is a laminated film of a triacetyl cellulose film and a brightness enhancement film.
［実施例５］
　実施例１と同様にして、偏光子を得た。
　次に、得られた偏光子の一方の面に、水１００部に対して、カルボキシル基変性ポリビニルアルコール（（株）クラレから入手した商品名「ＫＬ－３１８」）を３部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤（田岡化学工業（株）製の商品名「スミレーズレジン　６５０（３０）」、固形分濃度３０％の水溶液）を１．５部添加した水系のエポキシ系接着剤を塗布し、保護膜（Ｂ）として厚み２３μｍのシクロオレフィン系樹脂からなる延伸されていないフィルム（日本ゼオン（株）製の商品名「ＺＥＯＮＯＲ」）を貼合した。偏光子のもう一方の面には、粘着剤（リンテック（株）製の商品名「♯ＫＺ」、アクリル系粘着剤）を塗布して、厚み２０μｍの粘着剤層を形成した。前記粘着剤層を介して、製造例３で得られたハードコート層を有する輝度向上フィルムと偏光子とを、ハードコート層が偏光板の最表面になるように貼合して、偏光板を得た。 [Example 5]
A polarizer was obtained in the same manner as in Example 1.
Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%). An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 μm was bonded as a protective film (B). An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 μm. Through the pressure-sensitive adhesive layer, the brightness enhancement film having a hard coat layer obtained in Production Example 3 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Obtained.
［実施例６］
　実施例１と同様にして、偏光子を得た。
　次に、得られた偏光子の一方の面に、水１００部に対して、カルボキシル基変性ポリビニルアルコール（（株）クラレから入手した商品名「ＫＬ－３１８」）を３部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤（田岡化学工業（株）製の商品名「スミレーズレジン　６５０（３０）」、固形分濃度３０％の水溶液）を１．５部添加した水系のエポキシ系接着剤を塗布し、保護膜（Ｂ）として厚み２３μｍのシクロオレフィン系樹脂からなる延伸されていないフィルム（日本ゼオン（株）製の商品名「ＺＥＯＮＯＲ」）を貼合した。偏光子のもう一方の面には、粘着剤（リンテック（株）製の商品名「♯ＫＺ」、アクリル系粘着剤）を塗布して、厚み２０μｍの粘着剤層を形成した。前記粘着剤層を介して、製造例４で得られたハードコート層を有する輝度向上フィルムと偏光子とを、ハードコート層が偏光板の最表面になるように貼合して、偏光板を得た。 [Example 6]
A polarizer was obtained in the same manner as in Example 1.
Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%). An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 μm was bonded as a protective film (B). An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 μm. Through the pressure-sensitive adhesive layer, the brightness enhancement film having a hard coat layer obtained in Production Example 4 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Obtained.
［製造例５］
　厚み４０μｍのトリアセチルセルロースフィルム（コニカミノルタオプト（株）製の商品名「ＫＣ４ＵＹ」）を使用した。トリアセチルセルロースフィルムの片面にシリカ粒子を含有しない新中村化学工業（株）より入手したアクリル系ハードコート樹脂2種類（品名；A-DCP、UA-1100H）を混合したものをバーコーターにより塗工し、80℃の恒温槽で1分間乾燥させた。Ｆｕｓｉｏｎ　ＵＶ　Ｓｙｓｔｅｍｓ社製の紫外線照射システム及び専用のＤバルブにより、ラインスピード９．６、バルブ高さ４５ｍｍ、ＵＶ出力を６５％に設定した後、塗工面側から照射量３５０ｍＪ／ｃｍ２の条件で紫外線を照射して、コーティング層としてハードコート層を形成し、ハードコート層を有するトリアセチルセルロースフィルムを得た。ハードコート層の鉛筆硬度を測定したところ、ＨＢ以下であった。 [Production Example 5]
A triacetyl cellulose film having a thickness of 40 μm (trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.) was used. Coated with two types of acrylic hard coat resin (Product name: A-DCP, UA-1100H) obtained from Shin-Nakamura Chemical Co., Ltd. that does not contain silica particles on one side of a triacetyl cellulose film. And dried in a constant temperature bath at 80 ° C. for 1 minute. After setting the line speed 9.6, the valve height 45mm, and the UV output 65% by the UV irradiation system made by Fusion UV Systems and the dedicated D bulb, the irradiation amount 350mJ / cm 2 from the coated surface side Ultraviolet rays were irradiated to form a hard coat layer as a coating layer, and a triacetyl cellulose film having a hard coat layer was obtained. When the pencil hardness of the hard coat layer was measured, it was below HB.
［製造例６］
　輝度向上フィルム（３Ｍ社製のＡｄｖａｎｃｅｄ　Ｐｏｌａｒｉｚｅｄ　Ｆｉｌｍ，Ｖｅｒｓｉｏｎ　３）を使用した。前記輝度向上フィルムのポリカーボネート面に製造例５同様の手法により、コーティング層としてハードコート層を形成し、ハードコート層を有する輝度向上フィルムを得た。ハードコート層の鉛筆硬度を測定したところ、ＨＢ以下であった。 [Production Example 6]
A brightness enhancement film (Advanced Polarized Film, Version 3 manufactured by 3M) was used. A hard coat layer was formed as a coating layer on the polycarbonate surface of the brightness enhancement film in the same manner as in Production Example 5 to obtain a brightness enhancement film having a hard coat layer. When the pencil hardness of the hard coat layer was measured, it was below HB.
［比較例１］
　実施例１と同様にして、偏光子を得た。
　次に、得られた偏光子の一方の面に、水１００部に対して、カルボキシル基変性ポリビニルアルコール（（株）クラレから入手した商品名「ＫＬ－３１８」）を３部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤（田岡化学工業（株）製の商品名「スミレーズレジン　６５０（３０）」、固形分濃度３０％の水溶液）を１．５部添加した水系のエポキシ系接着剤を塗布し、保護膜（Ｂ）として厚み２３μｍのシクロオレフィン系樹脂からなる延伸されていないフィルム（日本ゼオン（株）製の商品名「ＺＥＯＮＯＲ」）を貼合した。偏光子のもう一方の面には、粘着剤（リンテック（株）製の商品名「♯ＫＺ」、アクリル系粘着剤）を塗布して、厚み２０μｍの粘着剤層を形成した。前記粘着剤層を介して、製造例５で得られたハードコート層を有するトリアセチルセルロースフィルムと偏光子とを、ハードコート層が偏光板の最表面になるように貼合して、偏光板を得た。 [Comparative Example 1]
A polarizer was obtained in the same manner as in Example 1.
Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%). An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 μm was bonded as a protective film (B). An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 μm. Via the pressure-sensitive adhesive layer, the triacetyl cellulose film having the hard coat layer obtained in Production Example 5 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Got.
［比較例２］
　実施例１と同様にして、偏光子を得た。
　次に、得られた偏光子の一方の面に、水１００部に対して、カルボキシル基変性ポリビニルアルコール（（株）クラレから入手した商品名「ＫＬ－３１８」）を３部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤（田岡化学工業（株）製の商品名「スミレーズレジン　６５０（３０）」、固形分濃度３０％の水溶液）を１．５部添加した水系のエポキシ系接着剤を塗布し、保護層（Ｂ）として厚み２３μｍのシクロオレフィン系樹脂からなる延伸されていないフィルム（日本ゼオン（株）製の商品名「ＺＥＯＮＯＲ」）を貼合した。偏光子のもう一方の面には、粘着剤（リンテック（株）製の商品名「♯ＫＺ」、アクリル系粘着剤）を塗布して、厚み２０μｍの粘着剤層を形成した。前記粘着剤層を介して、製造例６で得られたハードコート層を有する輝度向上フィルムと偏光子とを、ハードコート層が偏光板の最表面になるように貼合して、偏光板を得た。 [Comparative Example 2]
A polarizer was obtained in the same manner as in Example 1.
Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%). An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 μm was bonded as a protective layer (B). An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 μm. Through the pressure-sensitive adhesive layer, the brightness enhancement film having the hard coat layer obtained in Production Example 6 and a polarizer are bonded so that the hard coat layer becomes the outermost surface of the polarizing plate, Obtained.
［比較例３］
　実施例１と同様にして、偏光子を得た。
　次に、得られた偏光子の一方の面に、水１００部に対して、カルボキシル基変性ポリビニルアルコール（（株）クラレから入手した商品名「ＫＬ－３１８」）を３部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤（田岡化学工業（株）製の商品名「スミレーズレジン　６５０（３０）」、固形分濃度３０％の水溶液）を１．５部添加した水系のエポキシ系接着剤を塗布し、保護膜（Ｂ）として厚み２３μｍのシクロオレフィン系樹脂からなる延伸されていないフィルム（日本ゼオン（株）製の商品名「ＺＥＯＮＯＲ」）を貼合した。偏光子のもう一方の面には、粘着剤（リンテック（株）製の商品名「♯ＫＺ」、アクリル系粘着剤）を塗布して、厚み２０μｍの粘着剤層を形成した。前記粘着剤層を介して、保護膜として厚み４０μｍのトリアセチルセルロースフィルム（コニカミノルタオプト（株）製の商品名「ＫＣ４ＵＹ」）と偏光子とを貼合した。該トリアセチルセルロースフィルムに、粘着剤（リンテック（株）製の商品名「♯L2」、アクリル系粘着剤）を塗布し、厚み５μｍの粘着剤層を形成した。前記粘着剤層を介して、製造例６で得られたハードコート層を有する輝度向上フィルムを、ハードコート層が偏光板の最表面になるように貼合して、偏光板を得た。この場合、保護膜（Ａ）は、トリアセチルセルロースフィルムと輝度向上フィルムとの積層膜である。 [Comparative Example 3]
A polarizer was obtained in the same manner as in Example 1.
Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%). An epoxy adhesive was applied, and an unstretched film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) made of a cycloolefin resin having a thickness of 23 μm was bonded as a protective film (B). An adhesive (trade name “#KZ” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the other surface of the polarizer to form an adhesive layer having a thickness of 20 μm. A 40 μm-thick triacetyl cellulose film (trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.) and a polarizer were bonded as a protective film through the pressure-sensitive adhesive layer. An adhesive (trade name “# L2” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the triacetyl cellulose film to form an adhesive layer having a thickness of 5 μm. Through the pressure-sensitive adhesive layer, the brightness enhancement film having the hard coat layer obtained in Production Example 6 was bonded so that the hard coat layer was the outermost surface of the polarizing plate to obtain a polarizing plate. In this case, the protective film (A) is a laminated film of a triacetyl cellulose film and a brightness enhancement film.
［比較例４］
　実施例１と同様にして、偏光子を得た。
　次に、得られた偏光子の一方の面に、水１００部に対して、カルボキシル基変性ポリビニルアルコール（（株）クラレから入手した商品名「ＫＬ－３１８」）を３部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤（田岡化学工業（株）製の商品名「スミレーズレジン　６５０（３０）」、固形分濃度３０％の水溶液）を１．５部添加した水系のエポキシ系接着剤を塗布し、保護膜として厚み４０μｍのトリアセチルセルロースフィルム（コニカミノルタオプト（株）製の商品名「ＫＣ４ＵＹ」）を貼合した。該トリアセチルセルロースフィルムに、粘着剤（リンテック（株）製の商品名「♯L2」、アクリル系粘着剤）を塗布し、厚み５μｍの粘着剤層を形成した。前記粘着剤層を介して、製造例６で得られたハードコート層を有する輝度向上フィルムを、ハードコート層が偏光板の最表面になるように貼合した。さらに、偏光子のもう一方の面には、粘着剤（リンテック（株）製の商品名「♯ＫＺ」、アクリル系粘着剤）を塗布し、厚み２０μｍの粘着剤層を形成して、偏光板を得た。この場合、保護膜（Ａ）は、トリアセチルセルロースフィルムと輝度向上フィルムとの積層膜である。 [Comparative Example 4]
A polarizer was obtained in the same manner as in Example 1.
Next, on one surface of the obtained polarizer, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) was dissolved in 100 parts of water, and an aqueous solution thereof. A water-based epoxy resin added with 1.5 parts of a polyamide epoxy-based additive (trade name “Smiles Resin 650 (30)” manufactured by Taoka Chemical Industry Co., Ltd., aqueous solution with a solid content of 30%). An epoxy adhesive was applied, and a 40 μm thick triacetyl cellulose film (trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd.) was bonded as a protective film. An adhesive (trade name “# L2” manufactured by Lintec Co., Ltd., acrylic adhesive) was applied to the triacetyl cellulose film to form an adhesive layer having a thickness of 5 μm. The brightness enhancement film having the hard coat layer obtained in Production Example 6 was bonded via the pressure-sensitive adhesive layer so that the hard coat layer became the outermost surface of the polarizing plate. Further, a pressure-sensitive adhesive (trade name “#KZ” manufactured by Lintec Corporation, acrylic pressure-sensitive adhesive) was applied to the other surface of the polarizer to form a pressure-sensitive adhesive layer having a thickness of 20 μm. Got. In this case, the protective film (A) is a laminated film of a triacetyl cellulose film and a brightness enhancement film.
［表面特性の測定］
　実施例１～６、比較例１～４で得られた偏光板をＳＥＮＳＯＦＡＲ社製の三次元顕微鏡“ＰＬμ　２３００”により、対物レンズの倍率を５０倍とし、共焦点モードにて、コーティング層の表面特性（凹凸平均間隔；Ｓｍ）を求めた。測定面積は２５５μｍ×１８５μｍとした。また、サンプルの反りを防止するため、光学的に透明な粘着剤により、偏光板をガラス基板に貼合した状態（コーティング層の凹凸面が表面となる）で測定した。その結果を表１に示す。 [Measurement of surface properties]
The polarizing plate obtained in Examples 1 to 6 and Comparative Examples 1 to 4 was subjected to the surface of the coating layer in a confocal mode with a magnification of the objective lens by 50 times using a three-dimensional microscope “PLμ 2300” manufactured by SENSOFAR. Characteristics (average unevenness interval; Sm) were determined. The measurement area was 255 μm × 185 μm. Moreover, in order to prevent the curvature of a sample, it measured in the state which bonded the polarizing plate to the glass substrate with the optically transparent adhesive (The uneven surface of a coating layer becomes a surface). The results are shown in Table 1.
［バックライトテープ剥離試験］
　実施例１～６、比較例１～４で得られた偏光板におけるコーティング層から遠い側の面を、１２０ｍｍ×２００ｍｍのソーダガラスの一面に粘着剤を使用し、各偏光板とソーダガラスとを貼合する。次に日東電工（株）製バックライトテープＮｏ．５６０３ＢＮを幅２５ｍｍ、長さ１００ｍｍにカットし、偏光板のコーティング層に前記バックライトテープの粘着面を貼合する。このとき、バックライトテープをガラスから３０～４０ｍｍはみ出させた。得られたバックライトテープ、偏光板、ソーダガラスをこの順に有する積層体を２３℃/５０％の雰囲気下にて２４ｈｒ養生させた。
上記積層体における前述のガラスから３０～４０ｍｍはみ出させておいたバックライトテープを、（株）島津製作所のオートグラフＡＧＳ－５０ＮＸ型引張試験機のチャックに挟み、２３℃/５０％の雰囲気下、３００ｍｍ／分の引張速度で１８０度剥離させたときのバックライトテープ密着力を測定した。その結果を表１に示す。 [Backlight tape peel test]
In the polarizing plates obtained in Examples 1 to 6 and Comparative Examples 1 to 4, the surface far from the coating layer was used on one surface of 120 mm × 200 mm soda glass, and each polarizing plate and soda glass were bonded to each other. Paste. Next, backlight tape No. 1 manufactured by Nitto Denko Corporation. 5603BN is cut into a width of 25 mm and a length of 100 mm, and the adhesive surface of the backlight tape is bonded to the coating layer of the polarizing plate. At this time, the backlight tape protruded 30 to 40 mm from the glass. The obtained laminate having the backlight tape, the polarizing plate and the soda glass in this order was cured for 24 hours in an atmosphere of 23 ° C./50%.
The backlight tape that protruded 30 to 40 mm from the glass in the laminate was sandwiched between chucks of an autograph AGS-50NX type tensile tester manufactured by Shimadzu Corporation, and the atmosphere was 23 ° C./50%. The backlight tape adhesion was measured when the tape was peeled 180 degrees at a tensile speed of 300 mm / min. The results are shown in Table 1.
［衝撃試験］
　液晶セルに実施例１～６、比較例１～４で得られた偏光板を貼り付けた。さらに偏光板中のコーティング層とバックライトユニットとを日東電工（株）製バックライトテープＮｏ．５６０３ＢＮを介して接合した液晶モジュールを、１５０ｃｍの高さから、大理石の台の平面と液晶モジュールの面（計６面）とが重なり合うように落下させた。液晶モジュールの各面について合計６回落下させ、バックライトテープとコーティング層の界面の密着度合いを試験した。バックライトテープの端部がコーティング層から剥がれたときは、界面変化ありとみなし、剥がれが認められないときは界面変化なしとみなした。その結果を表１に示す [Shock test]
The polarizing plates obtained in Examples 1 to 6 and Comparative Examples 1 to 4 were attached to the liquid crystal cell. Further, the coating layer in the polarizing plate and the backlight unit were combined with a backlight tape No. 1 manufactured by Nitto Denko Corporation. The liquid crystal module joined via 5603BN was dropped from a height of 150 cm so that the plane of the marble base and the surface of the liquid crystal module (total of 6 surfaces) overlapped. Each surface of the liquid crystal module was dropped a total of 6 times, and the adhesion degree of the interface between the backlight tape and the coating layer was tested. When the edge of the backlight tape peeled off from the coating layer, it was considered that there was an interface change, and when no peeling was observed, it was considered that there was no interface change. The results are shown in Table 1.
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-I000005
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-I000005
［透過率］
　製造例１および２、並びに製造例５および６で得られたコーティング層を有する保護膜の透過率（A）と、コーティング層を形成する塗工液を塗工する前の保護膜（輝度向上フィルム及び、トリアセチルセルロースフィルム）の透過率（B）を測定した。透過率（A）は透過率（B）を１００％とした場合の相対的値とした。積分球付き分光光度計（日本分光株式会社製、Ｖ７１００）により測定した。波長３８０～７８０ｎｍの範囲においてＭＤ透過率とＴＤ透過率を求め、式（１）に基づいて各波長における単体透過率を算出し、さらにＪＩＳ　Ｚ　８７０１の２度視野(Ｃ光源)により視感度補正を行い、視感度補正単体透過率（Ｔｙ）を求めた。その結果を表２に示す。
　上記において、「ＭＤ透過率」とは、グラントムソンプリズムから出る偏光の向きと偏光板の透過軸を平行にしたときの透過率であり、式（１）においては「ＭＤ」と表す。また、「ＴＤ透過率」とは、グラントムソンプリズムから出る偏光の向きと偏光板の透過軸を直交にしたときの透過率であり、式（１）においては「ＴＤ」と表す。  
　単体透過率（％）=（ＭＤ＋ＴＤ）／２　　　　式（１）  [Transmissivity]
The transmittance (A) of the protective film having the coating layer obtained in Production Examples 1 and 2 and Production Examples 5 and 6, and the protective film (brightness enhancement film) before applying the coating liquid for forming the coating layer And the transmittance (B) of the triacetyl cellulose film) was measured. The transmittance (A) was a relative value when the transmittance (B) was 100%. It measured with the spectrophotometer with an integrating sphere (JASCO Corporation make, V7100). MD transmittance and TD transmittance are obtained in the wavelength range of 380 to 780 nm, the single transmittance at each wavelength is calculated based on the formula (1), and the visibility is corrected by the two-degree field of view (C light source) of JIS Z 8701 And the visibility corrected single transmittance (Ty) was obtained. The results are shown in Table 2.
In the above, “MD transmittance” is the transmittance when the direction of polarized light emitted from the Glan-Thompson prism is parallel to the transmission axis of the polarizing plate, and is represented by “MD” in Equation (1). The “TD transmittance” is a transmittance when the direction of polarized light emitted from the Glan-Thompson prism is orthogonal to the transmission axis of the polarizing plate, and is expressed as “TD” in the equation (1).
Single transmittance (%) = (MD + TD) / 2 Formula (1)
Figure JPOXMLDOC01-appb-T000006
Figure JPOXMLDOC01-appb-T000006
　本発明によれば、液晶セルに貼り付けられた保護膜一体型偏光板とバックライトユニットとを接合した後の、工程内での搬送や落下等の衝撃による両面テープの剥がれを防止することのできる偏光板、および該偏光板を用いた液晶表示装置を提供することができ有用である。 According to the present invention, it is possible to prevent the double-sided tape from being peeled off due to an impact such as transportation or dropping in the process after bonding the protective film integrated polarizing plate attached to the liquid crystal cell and the backlight unit. It is possible to provide a polarizing plate that can be used, and a liquid crystal display device using the polarizing plate.
１０,５０,６０,７０；偏光板
１３,５３,６３,７３；偏光子
１４,１５,５５,６５,６８,７４；保護膜
１６,５８,６９,７７；コーティング層
１７,５６,５７,６６,６７,７２,７６；粘着層
２０；画像表示素子
３０；液晶表示装置
４０；バックライトユニット
４１；両面テープ
４２；導光板
４３；プリズムアレイシート
５４,６４,７５；輝度向上フィルム 10, 50, 60, 70; Polarizing plates 13, 53, 63, 73; Polarizers 14, 15, 55, 65, 68, 74; Protective films 16, 58, 69, 77; Coating layers 17, 56, 57, 66, 67, 72, 76; adhesive layer 20; image display element 30; liquid crystal display device 40; backlight unit 41; double-sided tape 42; light guide plate 43; prism array sheets 54, 64, 75;

Claims (13)

  1. 偏光子、保護膜（Ａ）及びコーティング層をこの順に有する偏光板であって、
    前記コーティング層における前記偏光子から遠い側の面の凹凸平均間隔Ｓｍが１０μｍ以下である偏光板。     A polarizing plate having a polarizer, a protective film (A) and a coating layer in this order,
    The polarizing plate whose uneven | corrugated average space | interval Sm of the surface on the side far from the said polarizer in the said coating layer is 10 micrometers or less.
  2. 前記コーティング層が、シリカ粒子を含む請求項１に記載の偏光板。 The polarizing plate according to claim 1, wherein the coating layer contains silica particles.
  3. 前記シリカ粒子が、重合性不飽和基を有する有機化合物で表面修飾された粒子である請求項２に記載の偏光板。 The polarizing plate according to claim 2, wherein the silica particles are particles that are surface-modified with an organic compound having a polymerizable unsaturated group.
  4. 前記シリカ粒子の重量平均粒子径が、１～２０ｎｍである請求項２または３に記載の偏光板。 The polarizing plate according to claim 2 or 3, wherein the silica particles have a weight average particle diameter of 1 to 20 nm.
  5. 前記コーティング層が、ハードコート層である請求項１～４のいずれかに記載の偏光板。 The polarizing plate according to any one of claims 1 to 4, wherein the coating layer is a hard coat layer.
  6. 前記コーティング層の鉛筆硬度が、ＨＢ以上である請求項１～５のいずれかに記載の偏光板。 The polarizing plate according to any one of claims 1 to 5, wherein the coating layer has a pencil hardness of HB or more.
  7. 前記コーティング層の視感度補正透過率が、８０％以上である請求項１～６のいずれかに記載の偏光板。 The polarizing plate according to any one of claims 1 to 6, wherein the visibility-corrected transmittance of the coating layer is 80% or more.
  8. 前記偏光子の厚みが、３０μｍ以下である請求項１～７のいずれかに記載の偏光板。 The polarizing plate according to any one of claims 1 to 7, wherein the polarizer has a thickness of 30 袖 m or less.
  9. 前記保護膜（Ａ）が、輝度向上フィルムを含む請求項１～８のいずれかに記載の偏光板。 The polarizing plate according to claim 1, wherein the protective film (A) includes a brightness enhancement film.
  10. 前記保護膜（Ａ）が、セルロース系樹脂、（メタ）アクリル系樹脂、環状ポリオレフィン系樹脂、ポリエステル系樹脂、及びポリカーボネート系樹脂からなる群から選ばれる少なくとも一種の樹脂を含む請求項１～９のいずれかに記載の偏光板。 The protective film (A) comprises at least one resin selected from the group consisting of a cellulose resin, a (meth) acrylic resin, a cyclic polyolefin resin, a polyester resin, and a polycarbonate resin. The polarizing plate in any one.
  11. 前記保護膜（Ａ）が、面内位相差を有する請求項１～１０のいずれかに記載の偏光板。 The polarizing plate according to any one of claims 1 to 10, wherein the protective film (A) has an in-plane retardation.
  12. 前記偏光子における前記コーティング層から遠い側の面に保護膜（Ｂ）を有する請求項１～１１のいずれかに記載の偏光板。 The polarizing plate according to any one of claims 1 to 11, further comprising a protective film (B) on a surface of the polarizer far from the coating layer.
  13. 請求項１～１２のいずれかに記載の偏光板を有する液晶表示装置。 A liquid crystal display device comprising the polarizing plate according to any one of claims 1 to 12.
PCT/JP2016/082577 2015-11-11 2016-11-02 Polarizing plate and liquid crystal display device WO2017082134A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006106427A (en) * 2004-10-06 2006-04-20 Nitto Denko Corp Hard coat film, anti-reflection hard coat film, optical element, and image display device
JP2008224758A (en) * 2007-03-08 2008-09-25 Fujifilm Corp Liquid crystal display
JP2012128215A (en) * 2010-12-16 2012-07-05 Konica Minolta Advanced Layers Inc Hard coat film
JP2012173626A (en) * 2011-02-23 2012-09-10 Konica Minolta Advanced Layers Inc Method for manufacturing hard coat film, hard coat film, polarizing plate, and display device
JP2012173627A (en) * 2011-02-23 2012-09-10 Konica Minolta Advanced Layers Inc Hard coat film, polarizing plate, and display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006106427A (en) * 2004-10-06 2006-04-20 Nitto Denko Corp Hard coat film, anti-reflection hard coat film, optical element, and image display device
JP2008224758A (en) * 2007-03-08 2008-09-25 Fujifilm Corp Liquid crystal display
JP2012128215A (en) * 2010-12-16 2012-07-05 Konica Minolta Advanced Layers Inc Hard coat film
JP2012173626A (en) * 2011-02-23 2012-09-10 Konica Minolta Advanced Layers Inc Method for manufacturing hard coat film, hard coat film, polarizing plate, and display device
JP2012173627A (en) * 2011-02-23 2012-09-10 Konica Minolta Advanced Layers Inc Hard coat film, polarizing plate, and display device

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