WO2019131625A1 - Plaque polarisante - Google Patents

Plaque polarisante Download PDF

Info

Publication number
WO2019131625A1
WO2019131625A1 PCT/JP2018/047544 JP2018047544W WO2019131625A1 WO 2019131625 A1 WO2019131625 A1 WO 2019131625A1 JP 2018047544 W JP2018047544 W JP 2018047544W WO 2019131625 A1 WO2019131625 A1 WO 2019131625A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
pressure
sensitive adhesive
adhesive layer
thickness
Prior art date
Application number
PCT/JP2018/047544
Other languages
English (en)
Japanese (ja)
Inventor
白石　貴志
大地 中村
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020207019077A priority Critical patent/KR20200103698A/ko
Priority to CN201880084113.0A priority patent/CN111512197B/zh
Publication of WO2019131625A1 publication Critical patent/WO2019131625A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature

Definitions

  • the present invention relates to a polarizing plate.
  • image display devices represented by liquid crystal display devices and organic electroluminescent display devices (hereinafter, also referred to as organic EL) have rapidly spread.
  • a polarizing plate provided with a polarizer and a retardation layer is widely used in image display devices.
  • the durability of the polarizing plate becomes insufficient.
  • the polarizing plate may be wrinkled.
  • the wrinkles of the polarizing plate distort the image of the image display apparatus including the organic EL. Therefore, there is a problem that the wrinkles of the polarizing plate significantly impair the visibility of the image display device.
  • the present invention has been made in view of such circumstances, and an object thereof is to provide a polarizing plate which is durable even in a high temperature and high humidity environment and in which wrinkles are not easily generated.
  • a polarizing plate including a polarizer, a first pressure-sensitive adhesive layer, a retardation layer, and a second pressure-sensitive adhesive layer in this order, and a thickness T 1 of the first pressure-sensitive adhesive layer (Tamm), which is the sum of Tm ( ⁇ m) and the thickness T 2 ( ⁇ m) of the second pressure-sensitive adhesive layer, divided by the total thickness Tp ( ⁇ m) of the polarizing plate, Ta / Tp is 0.40 And a polarizer having a thickness of 15 ⁇ m or less.
  • the polarizing plate according to [1] further including an adhesive layer, and including a first retardation layer, an adhesive layer, and a second retardation layer in this order.
  • a polarizer a first pressure-sensitive adhesive layer, a first retardation layer, a third pressure-sensitive adhesive layer, a second retardation layer, and a second pressure-sensitive adhesive layer in this order And a thickness T 1 ( ⁇ m) of the first pressure-sensitive adhesive layer, a thickness T 2 ( ⁇ m) of the second pressure-sensitive adhesive layer, and a thickness T 3 ( ⁇ m) of the third pressure-sensitive adhesive layer.
  • Ta ′ / Tp ′ which is a value obtained by dividing Ta ′ ( ⁇ m), which is the sum of the above, and the total thickness Tp ′ ( ⁇ m) of the polarizing plate is 0.40 or less, and the thickness of the polarizer is 15 ⁇ m or less Is a polarizing plate.
  • a polarizing plate which is durable even in high temperature and high humidity environments and is less prone to wrinkles.
  • the “polarizing plate” is an optical film provided with a polarizer and a retardation layer.
  • the polarizing plate of the first embodiment includes a polarizer, a first pressure-sensitive adhesive layer, a retardation layer, and a second pressure-sensitive adhesive layer in this order.
  • FIG. 1 is an example of a schematic cross-sectional view showing the configuration of the polarizing plate according to the first embodiment. As shown in FIG. 1, in the polarizing plate 100, a polarizer 11, a first pressure-sensitive adhesive layer 12, a retardation layer 14, and a second pressure-sensitive adhesive layer 13 are laminated in this order.
  • the retardation layer 14 is, for example, a layer giving a retardation of ⁇ / 2, a layer giving a retardation of ⁇ / 4, and a positive C layer, and a layer obtained by laminating a combination of these layers. .
  • a laminate obtained by combining a laminate of a layer giving a retardation of ⁇ / 2 and a layer giving a retardation of ⁇ / 4, a laminate of a layer giving a retardation of ⁇ / 4 and a positive C layer Etc.
  • a layer giving a retardation of ⁇ / 2 is a retardation layer that converts the polarization orientation of linearly polarized light of a specific wavelength by 90 °.
  • a layer giving a retardation of ⁇ / 4 is a retardation layer that converts linearly polarized light of a specific wavelength into circularly polarized light (or circularly polarized light into linearly polarized light).
  • the retardation layer 14 is a layer giving a retardation of ⁇ / 4
  • the polarizing plate 100 including the polarizer 11 and the retardation layer 14 can function as a circularly polarizing plate.
  • “positive C layer” means Nx the refractive index in the in-plane slow axis direction, Ny the refractive index in the in-plane fast axis direction, and Nz the refractive index in the thickness direction
  • the layer satisfies the relation of Nz> Nx ⁇ Ny.
  • the polarizing plate configured as described above When the polarizing plate configured as described above is stored in a high temperature and high humidity environment, the polarizing plate may be wrinkled. As a result of investigations by the inventors, it was separately confirmed that in the polarizing plate in which a wrinkle occurred after storage in a high temperature and high humidity environment, the retardation layer was deformed. Such a phenomenon suggests that a stress that deforms the retardation layer works in a high temperature and high humidity environment. The stress that deforms the retardation layer is considered to be largely influenced by the adhesive in contact with the retardation layer.
  • the wrinkles after storing the polarizing plate in a high temperature and high humidity environment by controlling the structure of the pressure-sensitive adhesive layer in contact with the retardation layer.
  • the idea that the stress added to retardation layer can be controlled was obtained by controlling the composition of the adhesive in contact with retardation layer, and the invention was completed.
  • each layer which comprises the polarizing plate 100 of this embodiment is demonstrated in detail.
  • the polarizing plate 100 of the present embodiment has a polarizer 11.
  • the “polarizer” is an optical film having a property of transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis when non-polarized light is incident.
  • the resin film forming the polarizer may be a single layer resin film, or may be a laminated film of two or more layers.
  • the polarizer may be a cured film obtained by orienting a dichroic dye in a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound.
  • a polarizer composed of a single-layer resin film examples include polyvinyl alcohol (hereinafter sometimes abbreviated as PVA) -based film, partially formalized PVA-based film, ethylene / vinyl acetate copolymer-based portion A hydrophilic polymer film such as a saponified film, which has been subjected to a dyeing process with a dichroic substance such as iodine or a dichroic dye, and a drawing process, a dewatering product of PVA, a dehydrochlorination process of polyvinyl chloride And polyene-based oriented films, etc. From the viewpoint of excellent optical properties, it is preferable to use a polarizer obtained by dyeing a PVA-based film with iodine and uniaxially stretching it.
  • PVA polyvinyl alcohol
  • partially formalized PVA-based film partially formalized PVA-based film
  • ethylene / vinyl acetate copolymer-based portion A hydrophilic polymer film such as
  • the polyvinyl alcohol-type resin which is a raw material of a PVA-type film can be manufactured by saponifying polyvinyl acetate type resin.
  • the polyvinyl acetate resin may be a copolymer of vinyl acetate and other monomers copolymerizable with vinyl acetate, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate.
  • Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, acrylamides having an ammonium group, and the like.
  • the degree of saponification of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal modified with aldehydes, polyvinyl acetal and the like can also be used.
  • the polymerization degree of the polyvinyl alcohol resin is usually about 1,000 to 10,000, and preferably about 1,500 to 5,000.
  • What formed such polyvinyl alcohol-type resin into a film is used as a PVA-type film.
  • the method of forming the polyvinyl alcohol-based resin into a film is not particularly limited, and the film can be formed by a known method.
  • the film thickness of the PVA-based film is, for example, about 10 to 100 ⁇ m, preferably about 10 to 50 ⁇ m.
  • the thickness of the polarizer is preferably 2 ⁇ m or more, and more preferably 3 ⁇ m or more.
  • the thickness of the polarizer is 15 ⁇ m or less, and preferably 12 ⁇ m or less.
  • the upper limit and lower limit which were mentioned above can be combined arbitrarily.
  • the thickness of the polarizer is preferably 2 ⁇ m or more.
  • the thickness of a polarizer is thick, it becomes easy to generate
  • layer thickness means the dimension in the lamination direction of the layers in the polarizing plate.
  • a polarizer, an adhesive layer, an adhesive layer, a phase difference layer, a protective film etc. are mentioned, for example.
  • the thickness of the layer can be obtained by measuring an arbitrary point of the layer using, for example, a non-contact film thickness meter of white interference type or using a film thickness meter of contact type, and calculating the average value thereof. Can.
  • a noncontact film thickness meter precise measurement is possible without touching the object to be measured, and even if the object to be measured is a part of the layer of the laminate, the object is not peeled off The film thickness can be measured.
  • the protective film mentioned later is laminated
  • the protective film may be laminated on one side or both sides of the polarizer via an adhesive layer or an adhesive layer described later.
  • a protective film which can be laminated on one side or both sides of a polarizer for example, it is formed from a thermoplastic resin which is excellent in transparency, mechanical strength, heat stability, water blocking property, isotropy, etc.
  • a film is used.
  • thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, polyether sulfone resins, polysulfone resins, polycarbonate resins, and polyamides such as nylon and aromatic polyamides.
  • Resin polyimide resin, polyolefin resin such as polyethylene, polypropylene, ethylene / propylene copolymer, cyclic polyolefin resin having cyclo type and norbornene structure (also referred to as norbornene type resin), (meth) acrylic resin, polyarylate resin, polystyrene resin And polyvinyl alcohol resins, and mixtures thereof.
  • the resin compositions of the two protective films may be the same or different.
  • the film formed of a thermoplastic resin may be subjected to surface treatment (for example, corona treatment etc.) in order to improve the adhesion with a polarizer made of a PVA-based resin and a dichroic substance, and the primer layer A thin layer such as an undercoat layer may be formed.
  • surface treatment for example, corona treatment etc.
  • the protective film preferably has a moisture permeability of 1 to 1500 g / m 2 ⁇ 24 hours [hr] at a temperature of 40 ° C. and a humidity of 90% RH.
  • a moisture permeability of 1 to 1500 g / m 2 ⁇ 24 hours [hr] at a temperature of 40 ° C. and a humidity of 90% RH.
  • the moisture permeability of the protective film exceeds 1500 g / m 2 ⁇ 24 hr, wrinkles may easily occur in a polarizing plate including the protective film in a high temperature and high humidity environment.
  • the lower the moisture permeability of the protective film is, the more remarkable the wrinkle prevention effect of the polarizing plate including the protective film is, and the moisture permeability at a temperature of 40 ° C. and a humidity of 90% RH is 1000 g / m 2 ⁇ 24 hr or less. Is more preferable, and 100 g / m 2 ⁇ 24 hr or less is more preferable.
  • the thickness of the protective film is preferably 3 ⁇ m or more, and more preferably 5 ⁇ m or more.
  • the thickness of the protective film is preferably 50 ⁇ m or less, and more preferably 30 ⁇ m or less.
  • the upper limit value and the lower limit value described above can be arbitrarily combined.
  • the polarizer and the retardation layer are laminated via the first pressure-sensitive adhesive layer.
  • the “pressure-sensitive adhesive” is in the form of a flexible rubber, and exhibits adhesiveness by adhering itself to an adherend such as the polarizer and the protective film.
  • the active energy ray-curable pressure-sensitive adhesive described later can adjust the adhesive force by irradiating energy rays.
  • the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer conventionally known pressure-sensitive adhesives excellent in optical transparency can be used without particular limitation, and acrylic polymers, urethane polymers, silicone polymers, polyvinyl ether resins A pressure sensitive adhesive having a base polymer such as a polymer can be used. In addition, an active energy ray-curable pressure-sensitive adhesive, a heat-curable pressure-sensitive adhesive, or the like may be used. Among these, pressure-sensitive adhesives containing an acrylic resin as a base polymer which is excellent in transparency, adhesive strength, removability (hereinafter also referred to as reworkability), weather resistance, heat resistance and the like are preferable.
  • the first pressure-sensitive adhesive layer is composed of the reaction product of the pressure-sensitive adhesive composition containing the (meth) acrylic resin (1), the crosslinking agent (2) and the silane compound (3). preferable.
  • the (meth) acrylic resin (1) contained in the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer is derived from a (meth) acrylic acid alkyl ester represented by the following formula (I) Polymers containing structural units (hereinafter also referred to as “structural units (I)”) as main components (for example, containing 50% by mass or more) (hereinafter also referred to as “(meth) acrylic acid ester polymers”) Is preferred.
  • structural units (I) structural units
  • (meth) acrylic acid ester polymers for example, containing 50% by mass or more
  • R 10 represents a hydrogen atom or a methyl group
  • R 20 represents an alkyl group having 1 to 20 carbon atoms
  • the alkyl group has any of linear, branched or cyclic structure.
  • the hydrogen atom of the alkyl group may be replaced by an alkoxy group having 1 to 10 carbon atoms.
  • (meth) acrylic acid means that either acrylic acid or methacrylic acid may be used.
  • (Meth) such as (meth) acrylate has the same meaning.
  • (meth) acrylic acid ester represented by the formula (I) methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, n-butyl (meth) acrylate ) Acrylate, i-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, i-hexyl (meth) acrylate, n-heptyl (meth) acrylate, n-octyl (meth) ) Acrylate, i-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n- and i-nonyl (meth) acrylate, n-decyl (meth) acrylate, i-decyl (meth
  • alkoxy group-containing alkyl acrylate examples include 2-methoxyethyl (meth) acrylate and ethoxymethyl (meth) acrylate.
  • n-butyl (meth) acrylate or 2-ethylhexyl (meth) acrylate is preferable, and n-butyl (meth) acrylate is particularly preferable.
  • the (meth) acrylic acid ester polymer may contain a structural unit derived from another monomer other than the structural unit (I).
  • the structural units derived from other monomers may be of one type or of two or more types.
  • As another monomer which the (meth) acrylic acid ester polymer may contain there may be mentioned a monomer having a polar functional group, a monomer having an aromatic group, and an acrylamide type monomer.
  • the (meth) acrylate which has a polar functional group As a monomer which has a polar functional group, the (meth) acrylate which has a polar functional group is mentioned.
  • a polar functional group a hydroxy group, a carboxy group, a substituted amino group, an unsubstituted amino group etc. are mentioned.
  • the polar functional group also includes a heterocyclic group such as an epoxy group.
  • the content of the structural unit derived from the monomer having a polar functional group in the (meth) acrylic acid ester polymer is preferably 20 parts by mass with respect to 100 parts by mass of the total structural units of the (meth) acrylic acid ester polymer. It is the mass part or less, more preferably 0.1 mass part or more and 20 mass parts or less, further preferably 0.1 mass part or more and 10 mass parts or less, particularly preferably 0.5 mass part or more and 10 mass parts or less.
  • a monomer having an aromatic group it has one (meth) acryloyl group and one or more aromatic rings (for example, a benzene ring, a naphthalene ring, etc.) in the molecule, and a phenyl group, a phenoxyethyl group, Or (meth) acrylic acid ester having a benzyl group.
  • aromatic rings for example, a benzene ring, a naphthalene ring, etc.
  • the content of the structural unit derived from the monomer having an aromatic group in the (meth) acrylic acid ester polymer is preferably 50 parts by mass with respect to 100 parts by mass of the total structural units of the (meth) acrylic acid ester polymer. It is the mass part or less, more preferably 4 parts by mass or more and 50 parts by mass or less, still more preferably 4 parts by mass or more and 25 parts by mass or less.
  • N- (methoxymethyl) acrylamide N- (ethoxymethyl) acrylamide, N- (propoxymethyl) acrylamide, N- (butoxymethyl) acrylamide, N- (2-methylpropoxymethyl) acrylamide Etc.
  • bleed out of additives such as an antistatic agent described later can be suppressed.
  • a structural unit derived from another monomer other than the structural unit (I) As a structural unit derived from another monomer other than the structural unit (I), a structural unit derived from a styrenic monomer, a structural unit derived from a vinyl monomer, a plurality of (meth) acryloyl groups in a molecule The structural unit derived from the monomer which has group, etc. may be contained.
  • the weight average molecular weight (hereinafter, also simply referred to as “Mw”) of the (meth) acrylic resin (1) is preferably 500,000 to 2,500,000.
  • Mw weight average molecular weight
  • the operativity at the time of coating the coating liquid containing an adhesive composition as a weight average molecular weight is 2.5 million or less becomes favorable.
  • the molecular weight distribution (Mw / Mn) represented by the ratio of weight average molecular weight (Mw) to number average molecular weight (hereinafter simply referred to as "Mn”) is usually 2 to 10.
  • “weight average molecular weight” and “number average molecular weight” are polystyrene equivalent values measured by gel permeation chromatography (GPC).
  • the viscosity at 25 ° C. is preferably 20 Pa ⁇ s or less, and 0.1 to 15 Pa ⁇ s. It is more preferable that When the viscosity of the (meth) acrylic resin (1) at 25 ° C. is within the above range, it contributes to the improvement of the durability of the polarizing plate including the first pressure-sensitive adhesive layer formed of the resin and the reworkability.
  • the viscosity can be measured by a Brookfield viscometer.
  • the glass transition temperature of the (meth) acrylic resin (1) is preferably ⁇ 60 ° C. to ⁇ 10 ° C. from the viewpoint of achieving both adhesiveness and durability.
  • the glass transition temperature can be measured by a differential scanning calorimeter (DSC).
  • the (meth) acrylic resin (1) may contain two or more kinds of (meth) acrylic acid ester polymers.
  • (meth) acrylic acid ester polymers for example, those having a structural unit (I) as a main component and having a relatively low molecular weight such that the weight average molecular weight is in the range of 50,000 to 300,000 And (meth) acrylic acid ester polymers.
  • the pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer preferably contains a crosslinking agent (2).
  • the crosslinking agent (2) include conventional crosslinking agents (isocyanate compounds, epoxy compounds, aziridine compounds, metal chelate compounds, peroxides, etc.), and in particular the pot life of the pressure-sensitive adhesive composition, the crosslinking speed, and the polarizing plate It is preferable that it is an isocyanate type compound from a viewpoint of durability etc. of this.
  • the isocyanate compound a compound having at least two isocyanato groups (-NCO) in the molecule is preferable.
  • aliphatic isocyanate compounds for example, hexamethylene diisocyanate etc.
  • alicyclic isocyanate compounds for example isophorone diisocyanate
  • hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, aromatic isocyanate compounds eg, tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate
  • tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate and the like.
  • the crosslinking agent (2) is an adduct of the above-mentioned isocyanate compound with a polyhydric alcohol compound (adduct) [for example, an adduct with glycerol, trimethylolpropane etc.], isocyanurate, burette type compound, polyether polyol, polyester polyol It may be a derivative such as an isocyanate compound of urethane prepolymer type which is subjected to an addition reaction with an acrylic polyol, a polybutadiene polyol, a polyisoprene polyol or the like.
  • the crosslinking agents (2) can be used alone or in combination of two or more. Among these, tolylene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, these polyhydric alcohol compounds, or these isocyanurate compounds are preferable from the viewpoint of durability.
  • the proportion of the crosslinking agent (2) is, for example, 0.01 to 10 parts by mass, preferably 0.1 to 3 parts by mass, and more preferably 0.1 to 3 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin (1). It may be 1 to 1 part by mass. It is advantageous to the improvement of durability that it is below the above-mentioned upper limit, and it is advantageous to suppress the generation of gas and to improve the rework property that it is above the above-mentioned lower limit.
  • the pressure-sensitive adhesive composition can contain a silane compound (3).
  • silane compound (3) By containing the silane compound (3), the adhesion between the first pressure-sensitive adhesive layer and the layer laminated on the first pressure-sensitive adhesive layer can be enhanced. Two or more silane compounds (3) may be used.
  • silane compound (3) vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyltriethoxysilane Cidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydimethylsilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3- Methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane and the like can be mentioned.
  • the silane compound (3) can include an oligomer derived from the above-described exemplified compounds.
  • the content of the silane compound (3) in the pressure-sensitive adhesive composition is usually 0.01 to 10 parts by mass, preferably 0.03 to 5 parts by mass, per 100 parts by mass of the (meth) acrylic resin (1). Part, more preferably 0.05 to 2 parts by mass, and still more preferably 0.1 to 1 parts by mass.
  • the content of the silane compound (3) is 0.01 parts by mass or more, the adhesion between the first pressure-sensitive adhesive layer and the adherend can be easily improved. Bleed-out of the silane compound (3) from a 1st adhesive layer can be suppressed as content is 10 mass parts or less.
  • the pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer contains one or more additives such as an ultraviolet light absorber, an antistatic agent, a solvent, a crosslinking catalyst, a tackifier resin (tackifier), and a plasticizer. Can. Moreover, it is also useful to mix an ultraviolet ray curable compound to the pressure sensitive adhesive composition, form a first pressure sensitive adhesive layer, and then irradiate the ultraviolet ray to cure to form a harder pressure sensitive adhesive layer.
  • additives such as an ultraviolet light absorber, an antistatic agent, a solvent, a crosslinking catalyst, a tackifier resin (tackifier), and a plasticizer.
  • the thickness of the first pressure-sensitive adhesive layer is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more.
  • the thickness of the first pressure-sensitive adhesive layer is preferably 40 ⁇ m or less, more preferably 30 ⁇ m or less.
  • the upper limit and lower limit which were mentioned above can be combined arbitrarily. A polarizer and a phase difference layer can fully be bonded together as the thickness of a 1st adhesive layer is more than the said lower limit.
  • the thickness of the first pressure-sensitive adhesive layer is less than or equal to the upper limit, the retardation layer is unlikely to be displaced, and the effect of suppressing the generation of wrinkles in the polarizing plate due to the deformation of the retardation layer is enhanced.
  • the 1st pressure sensitive adhesive layer When manufacturing a layered product of this embodiment, when pasting a light polarizer and a phase contrast layer through the 1st adhesive with strong pressure, compared with the time of pasting with weak pressure, the 1st pressure sensitive adhesive layer May become thin. This occurs because the first pressure-sensitive adhesive layer has stretchability, but when the polarizer and the retardation layer are bonded and left for a while, the thickness of the first pressure-sensitive adhesive layer is restored. Therefore, when the polarizer and the retardation layer are bonded via the first adhesive under strong pressure, for example, after leaving for 5 minutes, the thickness of the first adhesive layer is measured to obtain a certain value. be able to.
  • the second pressure-sensitive adhesive layer is laminated on the surface of the retardation layer opposite to the surface in contact with the first pressure-sensitive adhesive layer.
  • the polarizing plate is stacked on a display panel or the like via the second pressure-sensitive adhesive layer.
  • the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer used for laminating the retardation layer and, for example, the display panel a conventionally known pressure-sensitive adhesive having excellent optical transparency can be used without particular limitation.
  • an adhesive which comprises a 2nd adhesive layer the thing similar to what was illustrated as an adhesive which comprises the 1st adhesive layer mentioned above can be used.
  • the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may have the same thickness or different thicknesses.
  • An active energy ray-curable pressure-sensitive adhesive can also be used as the pressure-sensitive adhesive of the second pressure-sensitive adhesive layer.
  • the "active energy ray-curable pressure-sensitive adhesive” has a property of being cured by being irradiated with energy rays such as ultraviolet rays and electron beams. Since the active energy ray-curable pressure-sensitive adhesive has adhesiveness even before energy beam irradiation, it adheres to an adherend such as a film, and can be cured by energy beam irradiation to adjust the adhesion. It is an adhesive having properties.
  • an active energy ray-curable pressure-sensitive adhesive is preferable, and among them, an ultraviolet-curable pressure-sensitive adhesive is more preferable.
  • the active energy ray-curable pressure-sensitive adhesive generally contains an acrylic pressure-sensitive adhesive and an energy ray-polymerizable compound as main components.
  • a crosslinking agent is further blended, and if necessary, a photopolymerization initiator, a photosensitizer, etc. can be blended.
  • the retardation layer is laminated on the display panel via the active energy ray-curable adhesive.
  • an active energy ray such as ultraviolet light, visible light, electron beam or X-ray is irradiated to cure the pressure-sensitive adhesive layer made of an active energy ray-curable pressure-sensitive adhesive.
  • the active energy ray ultraviolet rays are preferable, and as a light source in this case, low pressure mercury lamp, medium pressure mercury lamp, high pressure mercury lamp, super high pressure mercury lamp, chemical lamp, black light lamp, microwave excitation mercury lamp, metal halide lamp etc. it can.
  • the thickness of the second pressure-sensitive adhesive layer is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more.
  • the thickness of the second pressure-sensitive adhesive layer is preferably 40 ⁇ m or less, more preferably 30 ⁇ m or less, and may be 22 ⁇ m or less.
  • the upper limit and lower limit which were mentioned above can be combined arbitrarily. A retardation layer, a display panel, etc. can fully be bonded together as the thickness of a 2nd adhesive layer is more than the said lower limit.
  • the thickness of the second pressure-sensitive adhesive layer is equal to or less than the upper limit value, it is difficult to cause a deviation between the retardation layer laminated via the second pressure-sensitive adhesive layer and, for example, the display panel.
  • the thickness of the second pressure-sensitive adhesive layer may be larger than the thickness of the first pressure-sensitive adhesive layer.
  • the second is compared to the case of bonding with a weak pressure
  • the thickness of the pressure-sensitive adhesive layer may be reduced. This occurs because the second pressure-sensitive adhesive layer has stretchability.
  • the thickness of the second pressure-sensitive adhesive layer is restored. Therefore, when the retardation layer and the display panel or the like are bonded via the second adhesive under strong pressure, for example, after leaving for 5 minutes, the thickness of the second adhesive layer is measured, and then constant. You can get a value.
  • Ta ( ⁇ m) which is the sum of the thickness T 1 of the first pressure-sensitive adhesive layer and the thickness T 2 ( ⁇ m) of the second pressure-sensitive adhesive layer
  • It is a polarizing plate whose Ta / Tp which is a value divided by thickness Tp ( ⁇ m) is 0.40 or less.
  • the Ta / Tp is preferably 0.10 or more, more preferably 0.20 or more, and still more preferably 0.25 or more.
  • the Ta / Tp is preferably 0.38 or less.
  • the upper limit value and the lower limit value described above can be arbitrarily combined.
  • the retardation layer is less likely to shift, and the effect of suppressing the generation of wrinkles in the polarizing plate due to the deformation of the retardation layer is enhanced. This is considered to be because, by setting the ratio of the pressure-sensitive adhesive layer in the polarizing plate to a certain value or less, it is possible to make a layer configuration that is hard to allow water vapor to pass therethrough.
  • the value of Ta / Tp can be controlled by adjusting the thickness of the layer constituting the polarizing plate. It is effective to reduce the thickness of the first pressure-sensitive adhesive layer and the thickness of the second pressure-sensitive adhesive layer while securing the total thickness of the polarizing plate to some extent.
  • total thickness of polarizing plate means the dimension in the lamination direction of the polarizing plate. That is, “the total thickness of the polarizing plate in the first embodiment” means the thickness of the polarizer, the thickness of the first pressure-sensitive adhesive layer, the thickness of the retardation layer to be described later, the thickness of the second pressure-sensitive adhesive layer, and other polarized light It means the total thickness of all the optical film layers, the pressure-sensitive adhesive layer and the adhesive layer contained in the plate. The members not finally remaining in the display device are not included in the total thickness of the polarizing plate.
  • a surface protection film to be laminated on the surface of the polarizing plate on the side opposite to the display panel, and a separate film to be laminated on the second pressure sensitive adhesive layer. These layers are peeled off in the manufacturing process of the display device and do not finally remain in the display device.
  • the total thickness of the polarizing plate can be obtained, for example, by measuring at arbitrary five points of the polarizing plate with a micrometer and calculating the average value thereof.
  • the total thickness of the polarizing plate is the thickness of the polarizer, the thickness of the first pressure-sensitive adhesive layer, the thickness of the retardation layer to be described later, the thickness of the second pressure-sensitive adhesive layer, and all other optical film layers contained in the polarizing plate It can also be obtained by measuring the thicknesses of the pressure-sensitive adhesive layer and the adhesive layer and summing the values.
  • Thickness of polarizer thickness of first pressure-sensitive adhesive layer, thickness of retardation layer to be described later, thickness of second pressure-sensitive adhesive layer, all other optical film layers contained in polarizing plate, pressure-sensitive adhesive layer, adhesive layer
  • the thickness of can be measured by the method described herein.
  • the total thickness of the polarizing plate in the first embodiment is preferably 30 ⁇ m or more.
  • the total thickness of the polarizing plate is preferably 300 ⁇ m or less, more preferably 200 ⁇ m or less, and still more preferably 150 ⁇ m or less.
  • the upper limit and lower limit which were mentioned above can be combined arbitrarily. It can contribute to thinning of a polarizing plate as the total thickness of a polarizing plate is below the said upper limit.
  • strength of a polarizing plate improves that total thickness of a polarizing plate is more than the said lower limit.
  • the water vapor transmission rate of the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer at a temperature of 40 ° C. and a humidity of 90% RH is preferably 1,000 to 10,000 g / m 2 ⁇ 24 h, and 2,000 to 2000 It may be 9,000 g / m 2 ⁇ 24 h.
  • the water vapor transmission rate can be measured by a Lyssy water vapor transmission rate meter L80 series manufactured by Systech ILLINOIS.
  • the water vapor transmission rate of the pressure-sensitive adhesive layer is high, the pressure-sensitive adhesive is strongly affected by the high temperature and high humidity environment, so that the wrinkle of the polarizing plate is easily generated due to the deformation of the retardation layer. If it is difficult to measure the water vapor transmission rate with an adhesive alone, the water vapor transmission rate can be calculated from the ratio to the highly moisture-permeable substrate after the pressure-sensitive adhesive is pasted to the highly moisture-permeable substrate. Good.
  • the retardation layer 14 has a layer composed of a liquid crystal material (also referred to as a liquid crystal composition) containing a liquid crystal compound.
  • a layer composed of a liquid crystal material containing a liquid crystal compound means a layer in which the liquid crystal compound is cured.
  • a layer giving a retardation of ⁇ / 2 a layer giving a retardation of ⁇ / 4, a positive C layer and the like may be collectively referred to as a retardation layer.
  • the retardation layer may include a transparent substrate and an orientation layer described later.
  • the layer in which the liquid crystal compound is cured is formed, for example, on the alignment layer provided on the transparent substrate.
  • the "transparent substrate” is a substrate having transparency to such an extent that it can transmit light, particularly visible light.
  • “transparency” refers to a characteristic that the transmittance to light in the visible light region extending to a wavelength of 380 to 780 nm is 80% or more.
  • the transparent substrate may have a function of supporting the alignment layer, and may be a long substrate.
  • the transparent substrate functions as a releasable support and can support a phase difference layer for transfer. Further, it is preferable that the surface has a releasable adhesive strength.
  • the transparent substrate examples include a glass substrate and a plastic substrate, preferably a plastic substrate.
  • the plastic constituting the plastic substrate include polyolefins such as polyethylene, polypropylene and norbornene polymers, cyclic olefin resins, polyvinyl alcohol, polyethylene terephthalate, polymethacrylates, polyacrylates, triacetylcelluloses and diacetylcelluloses.
  • cellulose esters such as cellulose acetate propionate, polyethylene naphthalate, polycarbonates, polysulfones, polyether sulfones, polyether ketones, polyphenylene sulfides and polyphenylene oxides.
  • cellulose esters particularly preferred are cellulose esters, cyclic olefin resins, polyethylene terephthalates and polymethacrylic acid esters, from the viewpoint of easy availability from the market and excellent transparency.
  • a transparent base material although the single
  • thickness of a transparent base material it is preferable to set it as the range of 20 micrometers or more and 200 micrometers or less.
  • the thickness of the transparent substrate is 20 ⁇ m or more, strength is imparted.
  • the thickness is 200 ⁇ m or less, when a transparent base material is cut and processed into a sheet-like transparent base material, it is possible to suppress an increase in processing waste and wear of the cutting blade.
  • the transparent substrate may be subjected to various antiblocking treatments.
  • the anti-blocking treatment include an easy adhesion treatment, a treatment in which a filler or the like is kneaded, and an embossing (knurling treatment).
  • the layer in which the liquid crystal compound is cured is formed on the transparent substrate through the alignment layer. That is, the transparent base material and the alignment layer are laminated in this order, and the layer in which the liquid crystal compound is cured is laminated on the alignment layer.
  • the alignment layer is not limited to the vertical alignment layer, but may be an alignment layer in which the molecular axes of the liquid crystal compound are horizontally aligned, or may be an alignment layer in which the molecular axes of the liquid crystal compound are inclined.
  • the alignment film a film having solvent resistance which is not dissolved by coating of a coating liquid containing a liquid crystal compound described later, or a film having heat resistance in heat treatment for removing the solvent or aligning the liquid crystal compound is preferable.
  • the alignment film include an alignment film containing an alignment polymer, a photo alignment film, and a groove alignment film in which a concavo-convex pattern and a plurality of grooves are formed on the surface and aligned.
  • the thickness of the alignment film is usually in the range of 10 nm to 10000 nm, preferably in the range of 10 nm to 1000 nm, more preferably 500 nm or less, and still more preferably in the range of 10 nm to 200 nm.
  • the resin used for the alignment layer is not particularly limited as long as it is a resin used as a material of a known alignment film, and a conventionally known monofunctional or polyfunctional (meth) acrylate monomer is used under a polymerization initiator. A cured product or the like that has been cured can be used.
  • (meth) acrylate monomers for example, 2-ethylhexyl acrylate, cyclohexyl acrylate, diethylene glycol mono 2-ethylhexyl ether acrylate, diethylene glycol monophenyl ether acrylate, tetraethylene glycol monophenyl ether acrylate, trimethylolpropane triacrylate
  • resin 1 type of these
  • the type of liquid crystal compound used in the present embodiment is not particularly limited, but can be classified into a rod-shaped type (rod-shaped liquid crystal compound) and a disc-shaped type (disk-shaped liquid crystal compound, discotic liquid crystal compound). Furthermore, there are low molecular type and high molecular type, respectively.
  • the term “polymer” generally means one having a degree of polymerization of 100 or more (polymer physics / phase transition dynamics, Masao Doi, page 2, Iwanami Shoten, 1992).
  • any liquid crystal compound can also be used.
  • two or more types of rod-like liquid crystal compounds, two or more types of discotic liquid crystal compounds, or a mixture of a rod-like liquid crystal compound and a discotic liquid crystal compound may be used.
  • rod-like liquid crystal compound for example, compounds described in claim 1 of JP-A-11-513019 and paragraphs [0026] to [0098] of JP-A-2005-289980 can be suitably used.
  • discotic liquid crystal compound for example, compounds described in paragraphs [0020] to [0067] of JP-A-2007-108732 and paragraphs [0013] to [0108] of JP-A-2010-244038 are preferably used. It can be used.
  • the layer in which the liquid crystal compound is cured is more preferably formed using a rod-like liquid crystal compound having a polymerizable group or a discotic liquid crystal compound having a polymerizable group. Thereby, temperature change and humidity change of optical characteristics can be reduced.
  • the layer in which the liquid crystal compound is cured is preferably a layer formed by fixing a rod-like liquid crystal compound having a polymerizable group or a discotic liquid crystal compound having a polymerizable group by polymerization. In this case, after forming a layer, it is no longer necessary to exhibit liquid crystallinity.
  • the type of the polymerizable group is not particularly limited.
  • the polymerizable group is preferably a functional group capable of undergoing an addition polymerization reaction such as a polymerizable ethylenically unsaturated group or a ring polymerizable group. More specifically, as a polymeric group, a (meth) acryloyl group, a vinyl group, a styryl group, an allyl group etc. can be mentioned, for example. Among them, (meth) acryloyl group is preferable.
  • a (meth) acryloyl group is the concept including both a methacryloyl group and an acryloyl group.
  • the layer in which the liquid crystal compound is cured can be formed by, for example, applying a coating liquid containing the liquid crystal compound on the alignment layer, as described later.
  • the said coating liquid may contain components other than the liquid crystal compound mentioned above.
  • the coating solution may contain a polymerization initiator.
  • a polymerization initiator to be used a thermal polymerization initiator or a photopolymerization initiator is selected according to the type of polymerization reaction.
  • examples of the photopolymerization initiator include ⁇ -carbonyl compounds, acyloin ethers, ⁇ -hydrocarbon-substituted aromatic acyloin compounds, polynuclear quinone compounds, and combinations of triarylimidazole dimers and p-aminophenyl ketones.
  • the amount of the polymerization initiator used is preferably 0.01 to 20% by mass, and more preferably 0.5 to 5% by mass, with respect to the total solid content in the coating liquid.
  • the coating liquid may contain a polymerizable monomer from the viewpoint of the uniformity of the coating film and the strength of the film.
  • the polymerizable monomer include radically polymerizable or cationically polymerizable compounds. Among them, polyfunctional radically polymerizable monomers are preferred.
  • the polymerizable monomer a compound that can be copolymerized with the above-described liquid crystal compound having a polymerizable group (hereinafter, also referred to as a polymerizable liquid crystal compound) is preferable.
  • a polymerizable liquid crystal compound a compound that can be copolymerized with the above-described liquid crystal compound having a polymerizable group
  • Specific examples of the polymerizable monomer include those described in paragraphs [0018] to [0020] in JP-A-2002-296423.
  • the amount of the polymerizable monomer used is preferably 1 to 50% by mass, and more preferably 2 to 30% by mass, with respect to the total mass of the liquid crystal compound.
  • the coating liquid may contain a surfactant from the viewpoint of the uniformity of the coating film and the strength of the film.
  • a surfactant a conventionally well-known compound is mentioned. Among them, fluorine compounds are particularly preferable.
  • Specific examples of the surfactant include compounds described in paragraphs [0028] to [0056] in JP-A No. 2001-330725, and paragraphs [0069] to [0126] in Japanese Patent Application No. 2003-295212. The compound as described in can be mentioned.
  • the coating liquid may contain a solvent, and an organic solvent is preferably used.
  • the organic solvent include, for example, an amide (for example, N, N-dimethylformamide), a sulfoxide (for example, dimethyl sulfoxide), a heterocyclic compound (for example, pyridine), a hydrocarbon (for example, benzene, hexane), an alkyl halide (for example, Chloroform, dichloromethane), esters (eg, methyl acetate, ethyl acetate, butyl acetate), ketones (eg, acetone, methyl ethyl ketone), ethers (eg, tetrahydrofuran, 1,2-dimethoxyethane).
  • alkyl halides and ketones are preferable.
  • Two or more types of organic solvents may be used in combination as the coating solution.
  • a vertical alignment promoter such as a polarizer interface-side vertical alignment agent, an air interface-side vertical alignment agent, and a horizontal alignment promoter such as a polarizer interface-side horizontal alignment agent, an air interface-side horizontal alignment agent And the like may be contained. Further, in addition to the above components, the coating liquid may contain an adhesion improver, a plasticizer, a polymer and the like.
  • the thickness of the retardation layer is preferably 0.5 ⁇ m or more.
  • the thickness of the retardation layer is preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less.
  • the upper limit value and the lower limit value described above can be arbitrarily combined. When the thickness of the retardation layer is at least the lower limit value, sufficient durability can be obtained. It can contribute to thinning of a polarizing plate as the thickness of a phase difference layer is below the said upper limit.
  • the thickness of the retardation layer can be a layer giving a retardation of ⁇ / 4, a layer giving a retardation of ⁇ / 2, or a desired in-plane retardation value of the positive C layer and a retardation value in the thickness direction Can be adjusted.
  • the moisture permeability ratio at a temperature of 40 ° C. and a humidity of 90% RH of the retardation layer is preferably in the range of 0.5 to 1.0.
  • the moisture permeability ratio is a value calculated by the following method. Since the retardation layer alone has low thickness and mechanical properties, it is difficult to measure the moisture permeability. Therefore, the retardation layer is pasted to a substrate having high moisture permeability and an adhesive, and the moisture permeability is measured. The measurement of the moisture permeability can be performed in the same manner as the measurement of the moisture permeability of the protective film.
  • the moisture permeability ratio is calculated by the measured moisture permeability as a ratio to the moisture permeability of the substrate. The lower the moisture permeability ratio, the more effective the suppression of wrinkles in a high temperature, high humidity environment.
  • the polarizing plate of the second embodiment includes a polarizer, a first pressure-sensitive adhesive layer, a first retardation layer, an adhesive layer or a third pressure-sensitive adhesive layer, a second retardation layer, and a second retardation layer. And 2 pressure-sensitive adhesive layers in this order. That is, the polarizing plate of the second embodiment includes at least two retardation layers.
  • FIG. 2 is an example of a schematic cross-sectional view showing the configuration of the polarizing plate according to the second embodiment. As shown in FIG. 2, the polarizing plate 101 includes the polarizer 11, the first pressure-sensitive adhesive layer 12, the first retardation layer 15, the adhesive layer or the third pressure-sensitive adhesive layer 17, and the second The phase difference layer 16 and the second pressure-sensitive adhesive layer 13 are laminated in this order.
  • the first retardation layer 15 and the second retardation layer 16 are laminated via the adhesive layer or the third pressure-sensitive adhesive layer 17.
  • the first retardation layer 15 and the second retardation layer 16 can be a layer giving a phase difference of ⁇ / 2, a layer giving a phase difference of ⁇ / 4, or a positive C layer, respectively.
  • either one of the first retardation layer 15 and the second retardation layer 16 functions as a layer giving a retardation of ⁇ / 4, and the other has a wavelength of ⁇ / 2.
  • the thicknesses of the first retardation layer 15 and the second retardation layer 16 and the materials constituting these layers are a layer giving a retardation of ⁇ / 4, a layer giving a retardation of ⁇ / 2, or The desired in-plane retardation value of the positive C layer and the retardation value in the thickness direction can be adjusted to be obtained.
  • the first retardation layer 15 functions as a layer giving a retardation of ⁇ / 2 and the second retardation layer 16 functions as a layer giving a retardation of ⁇ / 4, the first retardation layer 15
  • the thickness of the second retardation layer 16 is, for example, 1 .mu.m to 10 .mu.m.
  • the thickness of the first retardation layer 15 is, for example, 1 ⁇ m.
  • the thickness of the second retardation layer 16 is, for example, not less than 1 ⁇ m and not more than 10 ⁇ m.
  • the alignment layer and the liquid crystal compound used to form the first retardation layer and the second retardation layer the same ones as those exemplified in the first embodiment can be used.
  • the compositions of the first retardation layer and the second retardation layer may be the same or different.
  • the thickness of the first retardation layer and the second retardation layer can be obtained by the method of measuring the thickness of the layer described in the first embodiment.
  • the first retardation layer and the second retardation layer are respectively similar to the description of the retardation layer in the first embodiment, and are laminated in the order of the transparent substrate, the orientation layer, and the retardation layer.
  • the transparent substrate and the alignment layer may be peeled off.
  • the first retardation layer and the second retardation layer are laminated via an adhesive layer or a third pressure-sensitive adhesive layer. That is, the polarizing plate of the second embodiment includes a laminate in which the first retardation layer, the adhesive layer and the third pressure-sensitive adhesive layer, and the second retardation layer are laminated in this order.
  • the polarizing plate of the second embodiment preferably includes a first retardation layer, an adhesive layer, and a second retardation layer in this order.
  • the “adhesive” constituting the adhesive layer can be applied to the substrate in a liquid state when applied to the substrate, and exhibits adhesiveness by curing (ie, until it cures) Does not develop adhesion). More specifically, the “adhesive” is one having a glass transition temperature (Tg) of 25 ° C. or higher when bonding adherent members. On the other hand, a “pressure-sensitive adhesive” is one having a glass transition temperature (Tg) of less than 25 ° C. when bonding adherent members.
  • a water-based adhesive and an active energy ray hardening adhesive are mentioned, for example.
  • water-based adhesives include adhesives in which a polyvinyl alcohol-based resin is dissolved and dispersed in water.
  • the active energy ray-curable adhesive includes, for example, an adhesive containing a curable compound which is cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays.
  • the storage modulus which is an index indicating the hardness of the active energy ray-curable adhesive after curing, is often higher than the storage modulus of the water-based adhesive. When the storage elastic modulus of the adhesive layer between the retardation layers is high, it is difficult to cause a shift between the retardation layers, so it is preferable to use an active energy ray curable adhesive.
  • the active energy ray-curable adhesive contains one or both of a cationically polymerizable curable compound and a radically polymerizable curable compound, because it exhibits good adhesion.
  • the active energy ray-curable adhesive can further contain one or both of a cationic polymerization initiator for initiating the curing reaction of the curable compound and a radical polymerization initiator.
  • a cationically polymerizable curable compound for example, an epoxy compound (a compound having one or more epoxy groups in the molecule) or an oxetane compound (one or more oxetane rings in the molecule) And compounds thereof, or combinations thereof.
  • a radically polymerizable curable compound for example, (meth) acrylic compounds (compounds having one or more (meth) acryloyloxy groups in the molecule), others having a radically polymerizable double bond And vinyl compounds, and combinations thereof.
  • the active energy ray-curable adhesive may, if necessary, be a cationic polymerization accelerator, an ion trap agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow control agent, a plasticizer, a plasticizer.
  • Additives such as a foaming agent, an antistatic agent, a leveling agent, and a solvent can be contained.
  • the adhesive is selected from any one of the first retardation layer and the second retardation layer. Apply to the bonding surface or both bonding surfaces.
  • the drying method in the case of using a water-based adhesive is not particularly limited, but, for example, a method of drying using a hot air dryer or an infrared dryer can be adopted.
  • the active energy ray-curable adhesive is cured by irradiating an active energy ray such as ultraviolet light, visible light, an electron beam, and an X-ray.
  • an active energy ray such as ultraviolet light, visible light, an electron beam, and an X-ray.
  • ultraviolet rays are preferable, and as a light source in this case, low pressure mercury lamp, medium pressure mercury lamp, high pressure mercury lamp, super high pressure mercury lamp, chemical lamp, black light lamp, microwave excitation mercury lamp, metal halide lamp etc. it can.
  • the thickness of the adhesive layer is preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less. When the thickness of the adhesive layer is equal to or less than the upper limit value, it is difficult to cause floating or peeling between the first retardation layer and the second retardation layer.
  • One side surface of the present embodiment in which the first retardation layer and the second retardation layer are laminated via the adhesive layer has a thickness T 1 ( ⁇ m) of the first pressure-sensitive adhesive layer.
  • Polarized light having a ratio Ta / Tp of 0.40 or less, which is a value obtained by dividing Ta ( ⁇ m) which is the sum of the thickness T 2 ( ⁇ m) of the second pressure-sensitive adhesive layer by the total thickness Tp ( ⁇ m) of the polarizing plate It is a board.
  • the Ta / Tp is preferably 0.10 or more, more preferably 0.20 or more, and still more preferably 0.25 or more. Moreover, it is preferable that said Ta / Tp is 0.38 or less.
  • the upper limit value and the lower limit value described above can be arbitrarily combined. When Ta / Tp is less than or equal to the above upper limit value, the retardation layer is less likely to shift, and the effect of suppressing the generation of wrinkles in the polarizing plate due to the deformation of the retardation layer is enhanced
  • the value of Ta / Tp can be reduced by increasing the value of Tp or decreasing the value of Ta.
  • it is preferable to reduce the value of Ta because it becomes difficult to produce a thin polarizing plate if the value of Tp becomes large. That is, it is effective to reduce the thickness of the first pressure-sensitive adhesive layer and the thickness of the second pressure-sensitive adhesive layer.
  • the total thickness of the polarizing plate in the present embodiment means the thickness of the polarizer, the thickness of the first pressure-sensitive adhesive layer, the thickness of the first retardation layer, the thickness of the adhesive layer, the thickness of the second retardation layer, The thickness of the second pressure-sensitive adhesive layer, and the total thickness of all the optical film layers, the pressure-sensitive adhesive layer, and the adhesive layer included in the other polarizing plates are meant. As described above, members not finally remaining in the display device are not included in the total thickness of the polarizing plate.
  • the total thickness of the polarizing plate in the present embodiment can be obtained, for example, by measuring at arbitrary five points of the polarizing plate with a micrometer and calculating the average value thereof.
  • the total thickness of the polarizing plate is, for example, the thickness of the polarizer, the thickness of the first pressure-sensitive adhesive layer, the thickness of the first retardation layer, the thickness of the adhesive layer, the thickness of the second retardation layer, the second The thickness of the pressure-sensitive adhesive layer, and the thicknesses of all the optical film layers, the pressure-sensitive adhesive layer, and the adhesive layer contained in the other polarizing plates can be obtained by measuring them and summing the values.
  • Thickness of polarizer thickness of first adhesive layer, thickness of first retardation layer, thickness of adhesive layer, thickness of second retardation layer, thickness of second adhesive layer, and others
  • the thicknesses of all the optical film layers, pressure-sensitive adhesive layers and adhesive layers contained in the polarizing plate of the invention can be measured by the method described herein.
  • the total thickness Tp of the polarizing plate is preferably 30 ⁇ m or more.
  • the total thickness Tp ( ⁇ m) of the polarizing plate is preferably 300 ⁇ m or less, more preferably 200 ⁇ m or less, and still more preferably 150 ⁇ m or less.
  • the upper limit value and the lower limit value described above can be arbitrarily combined. It can contribute to thinning of a polarizing plate as the total thickness of a polarizing plate is below the said upper limit.
  • strength of a polarizing plate improves that total thickness of a polarizing plate is more than the said lower limit.
  • Ta which is the sum of the thickness T 1 ( ⁇ m) of the first pressure-sensitive adhesive layer and the thickness T 2 ( ⁇ m) of the second pressure-sensitive adhesive layer in this embodiment, is preferably 50 ⁇ m or less More preferably, it is 45 ⁇ m or less. Ta is preferably 20 ⁇ m or more.
  • ⁇ Third adhesive layer> As the third pressure-sensitive adhesive via the first retardation layer and the second retardation layer according to this embodiment, a conventionally known pressure-sensitive adhesive having excellent optical transparency can be used without particular limitation.
  • an adhesive which comprises a 3rd adhesive layer the thing similar to the adhesive which comprises the 1st adhesive layer mentioned above can be used.
  • an active energy ray-curable pressure-sensitive adhesive may be used.
  • the thicknesses of the first pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer, and the third pressure-sensitive adhesive layer may be the same or different.
  • the thickness of the third pressure-sensitive adhesive layer is preferably 3 ⁇ m or more.
  • the thickness of the third pressure-sensitive adhesive layer is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, and still more preferably 10 ⁇ m or less.
  • the upper limit value and the lower limit value described above can be arbitrarily combined.
  • a 1st phase difference layer and a 2nd phase difference layer can fully be bonded as the thickness of a 3rd adhesive layer is more than the said lower limit.
  • the thickness of the third pressure-sensitive adhesive layer is equal to or less than the upper limit value, the first retardation layer and the second retardation layer are less likely to be displaced, and the generation of wrinkles in the polarizing plate due to the deformation of the retardation layer The suppressing effect is enhanced.
  • the thickness of the third pressure-sensitive adhesive layer may be thinner. This occurs because the third pressure-sensitive adhesive layer has stretchability, but when the first retardation layer and the second retardation layer are bonded and left for a while, the thickness of the third pressure-sensitive adhesive layer is originally reduced. It will be the street. Therefore, when the first retardation layer and the second retardation layer are bonded via the third pressure-sensitive adhesive under strong pressure, the thickness of the third pressure-sensitive adhesive layer is measured after being left for 5 minutes, for example. You can get a constant value by this.
  • One side surface of the present embodiment in which the first retardation layer and the second retardation layer are laminated via the third pressure-sensitive adhesive layer has a thickness T 1 of the first pressure-sensitive adhesive layer.
  • the total thickness Tp of the polarizing plate is Ta ′ ( ⁇ m) which is the sum of ( ⁇ m), the thickness T 2 ( ⁇ m) of the second pressure-sensitive adhesive layer and the thickness T 3 ( ⁇ m) of the third pressure-sensitive adhesive layer.
  • It is a polarizing plate whose Ta '/ Tp' which is a value divided by '( ⁇ m) is 0.40 or less.
  • the value of Ta ′ / Tp ′ is preferably 0.10 or more, more preferably 0.20 or more, and still more preferably 0.25 or more.
  • the value of Ta ′ / Tp ′ is preferably 0.40 or less, and more preferably 0.38 or less.
  • the upper limit value and the lower limit value described above can be arbitrarily combined. When Ta ′ / Tp ′ is less than or equal to the upper limit value, the retardation layer is less likely to shift, and the effect of suppressing the generation of wrinkles in the polarizing plate due to the deformation of the retardation layer is enhanced.
  • the value of Ta '/ Tp' can be controlled by adjusting the thickness of the layer constituting the polarizing plate. It is effective to reduce the thickness of the first pressure-sensitive adhesive layer, the thickness of the second pressure-sensitive adhesive layer, and the thickness of the third pressure-sensitive adhesive layer while securing the total thickness of the polarizing plate to some extent.
  • the total thickness Tp '( ⁇ m) of the polarizing plate means the thickness of the polarizer, the thickness of the first pressure-sensitive adhesive layer, the thickness of the first retardation layer, the thickness of the third pressure-sensitive adhesive layer, the second retardation
  • the thickness of the layer, the thickness of the second pressure-sensitive adhesive layer, and the total thickness of all the optical film layers, the pressure-sensitive adhesive layer, and the adhesive layer contained in the polarizing plate are meant.
  • the total thickness of the polarizing plate of the present invention can be obtained, for example, by measuring at arbitrary five points of the polarizing plate with a micrometer and calculating the average value thereof.
  • the total thickness of the polarizing plate of the present invention is, for example, the thickness of the polarizer, the thickness of the first pressure-sensitive adhesive layer, the thickness of the first retardation layer, the thickness of the third pressure-sensitive adhesive layer, the second retardation layer
  • the thickness of the second pressure-sensitive adhesive layer, and the thicknesses of all the optical film layers, the pressure-sensitive adhesive layer and the adhesive layer contained in the other polarizing plates are also measured, and the values are obtained by totaling the values. be able to.
  • Thickness of polarizer thickness of first pressure-sensitive adhesive layer, thickness of first retardation layer, thickness of third pressure-sensitive adhesive layer, thickness of second retardation layer, thickness of second pressure-sensitive adhesive layer, And, the thicknesses of all the optical film layers, pressure-sensitive adhesive layers and adhesive layers contained in the other polarizing plates can be measured by the method described in the present specification.
  • the total thickness Tp ′ ( ⁇ m) of the polarizing plate is preferably 30 ⁇ m or more, and more preferably 50 ⁇ m or more.
  • the total thickness of the polarizing plate is preferably 300 ⁇ m or less, more preferably 200 ⁇ m or less, and still more preferably 150 ⁇ m or less.
  • the upper limit and lower limit which were mentioned above can be combined arbitrarily. It can contribute to thinning of a polarizing plate as the total thickness of a polarizing plate is below the said upper limit.
  • strength of a polarizing plate improves that total thickness of a polarizing plate is more than the said lower limit.
  • Ta ′ ( ⁇ m) which is the sum of the thickness T 1 ( ⁇ m) of the first adhesive layer, the thickness T 2 ( ⁇ m) of the second adhesive layer, and the thickness T 3 ( ⁇ m) of the third adhesive layer Is preferably 50 ⁇ m or less, and more preferably 45 ⁇ m or less.
  • Ta ′ is preferably 20 ⁇ m or more.
  • a polarizer is a process of uniaxially stretching a PVA-based film, a process of allowing a dichroic dye to be adsorbed by dyeing a PVA-based film with a dichroic dye, a boro-based film having a dichroic dye adsorbed thereon. It is manufactured through a process of treating with an aqueous acid solution and crosslinking, and a process of washing with water after a crosslinking process with an aqueous solution of boric acid (hereinafter also referred to as boric acid treatment).
  • Uniaxial stretching of the PVA-based film can be performed before, simultaneously with, or after the dyeing with the dichroic dye.
  • this uniaxial stretching may be performed before or during the boric acid treatment.
  • uniaxial stretching can also be performed in a plurality of steps shown here.
  • a method of uniaxially stretching in the film transport direction between rolls having different peripheral speeds a method of uniaxially stretching in the film transport direction using a heat roll, a method of stretching in the width direction using a tenter, etc.
  • uniaxial stretching may be performed by dry stretching in which stretching is performed in the air, or may be performed by wet stretching in which a PVA-based film is swollen using a solvent such as water.
  • the stretching ratio is usually about 3 to 8 times.
  • Dyeing of a PVA-based film with a dichroic dye can be performed, for example, by immersing the PVA-based film in an aqueous solution containing a dichroic dye.
  • a dichroic dye iodine or a dichroic organic dye is used as the dichroic dye.
  • staining a PVA-type film the aqueous solution containing an iodine and potassium iodide is employ
  • the content of iodine in this aqueous solution is usually about 0.01 to 1 mass part per 100 mass parts of water, and the content of potassium iodide is usually about 0.5 to 20 mass parts per 100 mass parts of water It is.
  • the temperature of the aqueous solution used for dyeing is usually about 20 to 40.degree.
  • the immersion time (staining time) in the aqueous solution is usually about 20 to 1,800 seconds.
  • a method of dyeing by immersing a PVA-based film in an aqueous solution containing a water-soluble dichroic organic dye is employed.
  • the content of the dichroic organic dye in this aqueous solution is usually about 0.0001 to 10 parts by mass, preferably 0.001 to 1 parts by mass, per 100 parts by mass of water.
  • the aqueous dye solution may contain an inorganic salt such as sodium sulfate as a dyeing assistant.
  • the temperature of the aqueous solution of the dichroic organic dye used for dyeing is usually about 20 to 80.degree.
  • the immersion time (staining time) in the aqueous solution is usually about 10 to 1,800 seconds.
  • staining with a dichroic dye can be performed by the method of immersing the dyed PVA-type film in boric-acid containing aqueous solution.
  • the content of boric acid in the boric acid-containing aqueous solution is usually about 2 to 15 parts by mass, preferably 5 to 12 parts by mass, per 100 parts by mass of water.
  • this boric-acid containing aqueous solution contains potassium iodide.
  • the content of potassium iodide in the boric acid-containing aqueous solution is usually about 0.1 to 15 parts by mass, preferably 5 to 12 parts by mass, per 100 parts by mass of water.
  • the immersion time in the boric acid-containing aqueous solution is usually about 60 to 1,200 seconds, preferably 150 to 600 seconds, and more preferably 200 to 400 seconds.
  • the temperature of the boric acid-containing aqueous solution is usually 50 ° C. or higher, preferably 50 to 85 ° C., more preferably 60 to 80 ° C.
  • the PVA-based film after boric acid treatment is usually washed with water.
  • the water washing treatment can be performed, for example, by immersing the boric acid-treated PVA-based film in water.
  • the temperature of water in the water washing treatment is usually about 5 to 40.degree.
  • the immersion time is usually about 1 to 120 seconds.
  • drying treatment is performed to obtain a polarizer.
  • the drying process can be performed using a hot air dryer or a far infrared heater.
  • the temperature of the drying treatment is usually about 30 to 100 ° C., preferably 50 to 80 ° C.
  • the drying time is usually about 60 to 600 seconds, preferably 120 to 600 seconds.
  • the moisture content in the polarizer is reduced to a practical level.
  • the moisture content is usually about 5 to 20% by mass, preferably 8 to 15% by mass, with respect to the total mass of the polarizer.
  • the moisture content is 5% by mass or more, the polarizer has sufficient flexibility, so that damage or breakage after drying can be suppressed.
  • a polarizer has sufficient thermal stability as a moisture content is 20 mass% or less.
  • the polarizer 11 in which the dichroic dye is adsorbed and oriented on the PVA-based film can be manufactured.
  • a protective film may be further bonded to one side or both sides via the above-mentioned adhesive.
  • first pressure-sensitive adhesive layer As described above, the first pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer, and the third pressure-sensitive adhesive layer are preferably formed of a pressure-sensitive adhesive containing an acrylic resin as a base polymer.
  • the (meth) acrylic resin (1) described above can be usually produced by a known polymerization method such as a solution polymerization method, a bulk polymerization method, a suspension polymerization method or an emulsion polymerization method.
  • polymerization is usually carried out in the presence of a polymerization initiator.
  • the amount of the polymerization initiator used is usually 0.001 to 5 parts by mass with respect to 100 parts by mass in total of all the monomers constituting the (meth) acrylic resin (1).
  • the (meth) acrylic resin (1) can also be produced by a method of polymerizing with active energy rays such as ultraviolet rays.
  • the polymerization initiator includes a thermal polymerization initiator and a photopolymerization initiator.
  • Photopolymerization initiators include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone.
  • As a thermal polymerization initiator 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane-1-carbonitrile), 2 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2'-azobis (2-methylpropionate) Azo compounds such as 2,2'-azobis (2-hydroxymethylpropionitrile), lauryl peroxide, tert-butyl hydroperoxide, benzoyl peroxide, tert-butyl peroxybenzoate, cumene hydroperoxide, diisopropyl per
  • the (meth) acrylic resin (1) is preferably produced by a solution polymerization method. Specifically, a desired monomer and an organic solvent are mixed, and a thermal polymerization initiator is added to the obtained solution under a nitrogen atmosphere. By stirring the resulting mixture at about 40 ° C. to 90 ° C., preferably about 60 ° C. to 80 ° C., for about 3 to 10 hours, a (meth) acrylic acid ester polymer can be obtained.
  • a monomer, a thermal polymerization initiator or both of them may be continuously or intermittently added to the reaction system during the polymerization reaction or added in a state of being dissolved in an organic solvent. It is also good.
  • organic solvents examples include aromatic hydrocarbon solvents such as toluene and xylene, ester solvents such as ethyl acetate and butyl acetate, aliphatic alcohol solvents such as propyl alcohol and isopropyl alcohol, and ketone solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone It can be mentioned.
  • aromatic hydrocarbon solvents such as toluene and xylene
  • ester solvents such as ethyl acetate and butyl acetate
  • aliphatic alcohol solvents such as propyl alcohol and isopropyl alcohol
  • ketone solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone It can be mentioned.
  • a pressure-sensitive adhesive layer can be formed by, for example, applying the coating solution to an adherend and drying.
  • an adhesive layer can also be formed on a separate film by, for example, coating the said coating solution on a separate film and drying.
  • a die coater As a method for applying the coating solution of the pressure-sensitive adhesive composition onto an adherend or a separate film, a die coater, a comma coater, a reverse roll coater, a gravure coater, a rod coater, a wire bar coater, a doctor blade coater, A normal coating technique using an air doctor coater or the like may be employed.
  • the separate film is preferably composed of a plastic film and a release layer.
  • a plastic film polyester films, such as a polyethylene terephthalate film, a polybutylene terephthalate film, and a polyethylene naphthalate film, Polyolefin films, such as a polypropylene film, are mentioned.
  • the release layer can be formed, for example, from a composition for forming a release layer.
  • a main component (resin) which comprises the composition for peeling layer formation, A silicone resin, an alkyd resin, an acrylic resin, and a long chain alkyl resin etc. are mentioned.
  • each of the first pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer, and the third pressure-sensitive adhesive layer can be adjusted by the application conditions of the solution containing the pressure-sensitive adhesive composition. In order to reduce the thickness of the pressure-sensitive adhesive layer, it is effective to reduce the coating thickness.
  • the retardation layer may have a layer in which the liquid crystal compound is cured, and may further have a transparent substrate and an alignment layer.
  • An orientation layer is a layer which consists of resin which already mentioned above, applies the composition for orientation layers containing the monomer which forms the said resin on a transparent base material, makes it dry, and performs predetermined
  • the solvent (dilution solvent) used in the composition for alignment layer is not particularly limited as long as it can dissolve the alignment material to a desired concentration, and, for example, hydrocarbon solvents such as benzene and hexane, methyl ethyl ketone Ketone solvents such as (MEK), methyl isobutyl ketone (MIBK) and cyclohexanone (CHN); ether solvents such as tetrahydrofuran, 1,2-dimethoxyethane and propylene glycol monoethyl ether; halogenated alkyl such as chloroform and dichloromethane Solvents: Ester solvents such as methyl acetate, ethyl acetate, butyl acetate and propylene glycol monomethyl ether acetate; Amide solvents such as N, N-dimethylformamide; Sulfoxide solvents such as dimethyl sulfoxide; Anone solvents such as cyclohexane; Can be exe
  • a die coater As a method of coating the composition for alignment layer on a transparent substrate, a die coater, a comma coater, a reverse roll coater, a gravure coater, a rod coater, a wire bar coater, a doctor blade coater, an air doctor coater, etc. were used.
  • the usual coating technology may be adopted.
  • the layer in which the liquid crystal compound is cured is formed by applying a coating liquid containing a polymerizable liquid crystal compound to the alignment layer and drying it, and then performing a predetermined curing treatment.
  • the cured product formed in this manner constitutes a retardation layer.
  • the content of the polymerizable liquid crystal compound with respect to the total mass of the coating liquid containing the polymerizable liquid crystal compound is not particularly limited, but can be in the range of 5 to 40% by mass. When it is desired to adjust the viscosity and the like according to the coating method applied on the alignment layer, the content of the polymerizable liquid crystal compound may be adjusted.
  • the polymerizable liquid crystal compounds can be used singly or in combination of two or more.
  • the coating liquid containing the above-mentioned polymerizable liquid crystal compound is usually dissolved in the solvent (dilution solvent) as described above, and is preferably a solvent inactive to the polymerization reaction of the above-mentioned polymerizable liquid crystal compound.
  • the polymerization method may be selected according to the type of polymerizable group of the polymerizable liquid crystal compound. If the polymerizable group is a photopolymerizable group, it can be polymerized by a photopolymerization method. If the polymerization group is a thermally polymerizable group, it can be polymerized by a thermal polymerization method. In the method for producing a retardation layer of the present embodiment, a photopolymerization method is preferable. In the photopolymerization method, since it is not necessary to heat the transparent substrate to a high temperature, a transparent substrate with low heat resistance can be used. The photopolymerization method is performed by irradiating a film made of a liquid crystal composition containing a polymerizable liquid crystal compound with visible light or ultraviolet light. Ultraviolet light is preferred in terms of ease of handling.
  • the above-mentioned water-based adhesive or active energy ray curable adhesive is used as the first retardation layer and the second retardation layer. It coats to any one or both of a phase difference layer, and bonds a 1st phase difference layer and a 2nd phase difference layer together.
  • a laminate including two retardation layers can be obtained by subsequently curing the adhesive according to the above-described drying method.
  • an active energy ray-curable adhesive a laminate including two retardation layers can be obtained by irradiating the adhesive with energy rays including ultraviolet rays.
  • the laminate including the two retardation layers was laminated in the order of the transparent substrate, the alignment layer, the first retardation layer, the adhesive layer, the second retardation layer, the alignment layer, and the transparent substrate. It can be a laminate.
  • the transparent base material and the alignment layer can be peeled off before the retardation layer is attached to the polarizing plate.
  • the separation of the third pressure-sensitive adhesive layer formed on the separate film subjected to release treatment can be bonded to the surface opposite to the surface on which the film is laminated.
  • the separate film of the third pressure-sensitive adhesive layer can be peeled off, and the first retardation layer or the second retardation layer can be bonded to the exposed surface.
  • the adhesion can be adjusted by irradiating energy rays including ultraviolet rays.
  • a laminate including two retardation layers is, for example, a transparent substrate, an alignment layer, a first retardation layer, a third pressure-sensitive adhesive layer, a second retardation layer, an alignment layer and a transparent substrate in this order. It is a laminated body laminated by The transparent base material and the alignment layer can be peeled off before the retardation layer is attached to the polarizing plate.
  • a pressure-sensitive adhesive layer formed on the above-described pressure-sensitive adhesive composition or separate film can be used as the pressure-sensitive adhesive.
  • a pressure-sensitive adhesive formed on a separate film is used as the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer will be described.
  • the polarizer 11 and the first pressure-sensitive adhesive layer 12 are laminated. Specifically, by bonding the surface of the first pressure-sensitive adhesive layer 12 opposite to the surface on which the separate film of the first pressure-sensitive adhesive layer 12 is laminated to one side of the polarizer 11, a polarizer is obtained. 11 and the first pressure-sensitive adhesive layer 12 can be laminated.
  • the first pressure-sensitive adhesive layer 12 and the retardation layer 14 are laminated.
  • the first pressure-sensitive adhesive layer 12 and the phase difference layer 14 can be laminated by bonding the phase difference layer 14 to the exposed surface by peeling off the separate film of the first pressure-sensitive adhesive layer 12.
  • the surface of the retardation layer 14 in contact with the first pressure-sensitive adhesive layer 12 is the surface of the alignment layer exposed by peeling off the transparent substrate, or the surface of the retardation layer 14 located on the opposite side of the alignment layer.
  • the retardation layer 14 and the second pressure-sensitive adhesive layer 13 are laminated.
  • phase difference layer 14 and the second pressure-sensitive adhesive layer 13 are laminated by bonding the phase difference layer 14 to the surface of the second pressure-sensitive adhesive layer 13 opposite to the surface on which the separate film is laminated. be able to.
  • the surface of the retardation layer 14 in contact with the second pressure-sensitive adhesive layer 13 is a surface located on the opposite side of the surface of the retardation layer 14 in contact with the first pressure-sensitive adhesive layer 12.
  • the polarizing plate 100 according to the first embodiment may be laminated on a display panel or the like via the second pressure-sensitive adhesive layer 13.
  • the pressure-sensitive adhesive layer formed on the above-described pressure-sensitive adhesive composition or separate film can be used.
  • the adhesive layer formed on the separate film is used as a 1st adhesive layer and a 2nd adhesive layer as an example is demonstrated.
  • the polarizer 11 and the first pressure-sensitive adhesive layer 12 are laminated. Specifically, by bonding the surface of the first pressure-sensitive adhesive layer 12 opposite to the surface on which the separate film is laminated to one side of the polarizer 11, the polarizer 11 and the first pressure-sensitive adhesive layer are laminated. And 12 can be stacked.
  • the first pressure-sensitive adhesive layer 12 and a laminate including two retardation layers are laminated.
  • the first pressure-sensitive adhesive layer 12 and the above-mentioned laminate are laminated by bonding the separate film of the first pressure-sensitive adhesive layer 12 and the laminate including the two retardation layers on the exposed surface. be able to.
  • the surface of the laminate in contact with the first pressure-sensitive adhesive layer 12 is the surface of the alignment layer exposed by peeling off any one of the transparent substrates positioned at both ends of the laminate including the retardation layer, or the retardation layer It is the surface of the phase difference layer which peeled off and exposed any one of the transparent base material and the orientation layer which are located in the both ends of the laminated body containing.
  • the laminate including the two retardation layers and the second pressure-sensitive adhesive layer 13 are laminated.
  • the laminate and the second pressure-sensitive adhesive Layer 13 can be laminated.
  • the surface of the laminate in contact with the second pressure-sensitive adhesive layer 13 is a surface opposite to the surface on which the laminate is in contact with the first pressure-sensitive adhesive layer 12, and the transparent substrate is peeled off and exposed. It is the surface of the alignment layer, or the surface of the retardation layer exposed by peeling off the transparent substrate and the alignment layer.
  • the polarizing plate 101 according to the second embodiment may be laminated on a display panel or the like via the second pressure-sensitive adhesive layer 13.
  • the polarizing plate having the above-described configuration it is possible to suppress the generation of wrinkles of the polarizing plate due to the deformation of the retardation layer even in a high temperature and high humidity environment.
  • the polarizing plate of the present invention can be used in various display devices.
  • the display device is a device having a display element, and includes a light emitting element or a light emitting device as a light emitting source.
  • Examples of display devices include liquid crystal display devices, organic EL display devices, inorganic electroluminescence (hereinafter also referred to as inorganic EL) display devices, electron emission display devices (for example, field emission display devices (also referred to as FED), surface field emission display Device (also referred to as SED), electronic paper (display device using electronic ink or electrophoretic element, plasma display device, projection type display device (for example, grating light valve (also referred to as GLV) display device, digital micro mirror device (DMD) And the like), a piezoelectric ceramic display, and the like.
  • inorganic EL inorganic electroluminescence
  • FED field emission display devices
  • SED surface field emission display Device
  • electronic paper display device using electronic ink or electrophoretic element
  • plasma display device
  • the liquid crystal display device includes any of a transmissive liquid crystal display device, a semi-transmissive liquid crystal display device, and the like. These display devices may be display devices that display two-dimensional images, or may be stereoscopic display devices that display three-dimensional images.
  • the present polarizing plate can be used particularly effectively for an organic EL display device or an inorganic EL display device.
  • the weight average molecular weight (Mw) of the (meth) acrylic resin for pressure-sensitive adhesive layer formation is a weight average molecular weight in terms of polystyrene measured using gel permeation chromatography (GPC) under the following conditions.
  • GPC gel permeation chromatography
  • the moisture permeability ratio of the retardation layer was measured as follows. A pressure-sensitive adhesive composition F described later was applied onto a substrate using a bar coater to form a pressure-sensitive adhesive composition layer having a thickness of 2 to 3 ⁇ m, and a laminate for moisture permeability evaluation of the substrate was obtained. . As a substrate, a triacetyl cellulose film manufactured by Konica Minolta Co., Ltd. was used. A retardation layer was further laminated on the pressure-sensitive adhesive composition layer in the laminate for moisture permeability evaluation of the substrate to obtain a laminate for moisture permeability evaluation of the retardation layer. The moisture permeability of the obtained laminate for evaluation was measured at a temperature of 40 ° C.
  • the thickness of the triacetyl cellulose film used was 20 ⁇ m.
  • required in the same manner to the above was 1200 g / m 2 * 24 h.
  • the moisture permeability of the laminate for moisture permeability evaluation of the base material was 1000 g / m 2 ⁇ 24 h.
  • the moisture permeability of the laminate for moisture permeability evaluation of the retardation layer was measured, and the moisture permeability ratio was calculated by dividing by the moisture permeability of the laminate for moisture permeability evaluation of the base material.
  • the moisture permeability of the pressure-sensitive adhesive layer was measured using a water vapor transmission rate meter (manufactured by Lyssy, model name “Lyssy-L80-5000”) under the conditions of a temperature of 40 ° C. and a humidity of 90% RH.
  • the adhesive was manufactured by the following method.
  • Adhesives AE 97.0 parts by mass of n-butyl acrylate, 1.0 parts by mass of acrylic acid, 0.5% by weight of 2-hydroxyethyl acrylate in a reaction vessel equipped with a stirrer, a thermometer, a reflux condenser, a dropping device and a nitrogen introducing pipe
  • the parts by mass, 200 parts by mass of ethyl acetate, and 0.08 parts by mass of 2,2′-azobisisobutyronitrile were charged, and the air in the reaction vessel was replaced with nitrogen gas.
  • the reaction solution was heated to 60 ° C. with stirring under a nitrogen atmosphere, reacted for 6 hours, and cooled to room temperature. When the weight average molecular weight of a part of the obtained solution was measured, it was confirmed that 1.8 million (meth) acrylic acid ester polymers were formed.
  • the thickness after drying is 6 ⁇ m (pressure-sensitive adhesive A), 10 ⁇ m (pressure-sensitive adhesive B), 15 ⁇ m (pressure-sensitive adhesive C) on the release-treated surface (release layer surface) of a separator (Lintech Co., Ltd .: SP-PLR 382 190) ), 20 ⁇ m (pressure-sensitive adhesive D), 25 ⁇ m (pressure-sensitive adhesive E), the coating solution is coated, and then dried at 100 ° C. for 1 minute, and the surface of the pressure-sensitive adhesive layer to which the separator is attached Another separator (manufactured by Lintec Corporation: SP-PLR 381031) was bonded to the opposite side to obtain a double-sided separator-attached pressure-sensitive adhesive layer.
  • the moisture permeability (water vapor permeability) of adhesive A, adhesive B, adhesive C, adhesive D, and adhesive E is 8200 g / m 2 ⁇ 24 h, 6800 g / m 2 ⁇ 24 h, 6300 g / m 2 ⁇ 24 h, respectively. , 4700 g / m 2 ⁇ 24 h and 3600 g / m 2 ⁇ 24 h.
  • This adhesive layer is irradiated with ultraviolet light (irradiation intensity 500 mW / cm 2 , integrated light quantity 500 mJ / cm 2 ) through a peeling sheet using an ultraviolet irradiation device with a belt conveyor (using Fusion UV Systems, Inc., lamp uses D bulb) To obtain a double-sided separator-attached pressure-sensitive adhesive layer.
  • the water vapor transmission rate of the adhesive F was 7600 g / m 2 ⁇ 24 h.
  • a polyvinyl alcohol film with an average degree of polymerization of about 2400 and a degree of saponification of 99.9 mol% or more and a thickness of 30 ⁇ m was uniaxially stretched about 5 times by dry stretching, and further kept in tension, in pure water at 60 ° C 1 After soaking for a minute, it was immersed for 60 seconds in an aqueous solution of 28 ° C. having an iodine: potassium iodide: water mass ratio of 0.05: 5: 100. Thereafter, it was immersed for 300 seconds in an aqueous solution of 72 ° C. having a potassium iodide: boric acid: water mass ratio of 8.5: 8.5: 100.
  • the film was washed with pure water at 26 ° C. for 20 seconds, and then dried at 65 ° C. to obtain a 12 ⁇ m-thick polarizer in which iodine was adsorbed and oriented to a polyvinyl alcohol film.
  • 3 parts of carboxy group-modified polyvinyl alcohol [trade name "KL-318" obtained from Kuraray Co., Ltd.] was dissolved in 100 parts of water on one side of this polarizer, and water-soluble epoxy resin was dissolved in the aqueous solution.
  • An epoxy-based additive containing 1.5 parts of a polyamide epoxy-based additive (trade name “Sumiles resin (registered trademark) 650 (30)” obtained from Taoka Chemical Industry Co., Ltd., an aqueous solution with a solid content concentration of 30%).
  • An adhesive was applied, and a 30 ⁇ m-thick norbornene resin film was laminated as a transparent protective film. Surface treatment was given to one surface of this film, and it bonded so that the other side might become a bonding surface with a polarizer.
  • a 20 ⁇ m-thick triacetylcellulose-based resin film was bonded using the above-mentioned adhesive.
  • a 62 ⁇ m-thick polarizer (1) in which protective films were laminated on both sides of the polarizer was obtained.
  • the first retardation layer a layer having a cured nematic liquid crystal compound, an alignment film, and a layer giving a retardation of ⁇ / 4 comprising a transparent substrate were prepared.
  • the total thickness of the layer in which the nematic liquid crystal compound was cured and the alignment layer was 2 ⁇ m.
  • the moisture permeability ratio of the first retardation layer was 0.48.
  • the composition for vertical alignment layer was coated on one side to a film thickness of 3 ⁇ m, and 20 mJ / cm 2 of polarized ultraviolet light was irradiated to produce an alignment layer.
  • 2-phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, dipentaerythritol triacrylate, and bis (2-vinyloxyethyl) ether are 1: 1: 4: 5.
  • the mixture was mixed at a ratio of 4% and LUCIRIN.RTM. TPO was added as a polymerization initiator at a ratio of 4%.
  • a liquid crystal composition containing a photopolymerizable nematic liquid crystal (manufactured by Merck, RMM 28B) was applied onto the alignment layer by die coating on the formed alignment layer.
  • a photopolymerizable nematic liquid crystal manufactured by Merck, RMM 28B
  • MK methyl ethyl ketone
  • MIBK methyl isobutyl ketone
  • CHN cyclohexanone having a boiling point of 155 ° C. as a solvent in a mass ratio (MEK: MIBK: CHN) of 35:
  • a mixed solvent mixed at a ratio of 30:35 was used.
  • the liquid crystal composition prepared so as to have a solid content of 1 to 1.5 g was coated on the alignment layer so that the coating amount was 4 to 5 g (wet).
  • the drying temperature was set to 75 ° C., and the drying time was set to 120 seconds for drying treatment.
  • the liquid crystal compound was polymerized by ultraviolet (UV) irradiation to obtain a positive C layer comprising a layer in which the photopolymerizable nematic liquid crystal compound is cured, an alignment layer, and a transparent substrate.
  • UV ultraviolet
  • the total thickness of the layer in which the photopolymerizable nematic liquid crystal compound was cured and the alignment layer was 4 ⁇ m.
  • the moisture permeability ratio of the second retardation layer was 0.60.
  • the first retardation layer and the second retardation layer were pasted together with an ultraviolet curing adhesive so that the respective retardation layer surfaces (surfaces on the side opposite to the transparent substrate) became the bonding surfaces. . Then, it was irradiated with ultraviolet light to cure the ultraviolet curable adhesive. The thickness after curing of the ultraviolet curing adhesive was 2 ⁇ m. Thus, a laminate (1) including the first retardation layer and the second retardation layer was produced.
  • the first retardation layer and the second retardation layer were pasted from the pressure-sensitive adhesive F so that the respective retardation layer surfaces (surfaces on the side opposite to the transparent substrate) became a bonding surface.
  • a laminate (2) including the first retardation layer and the second retardation layer was produced.
  • Example 1 The adhesive A having a thickness of 6 ⁇ m was transferred to the side surface of the triacetylcellulose-based resin film of the polarizer (1) as a first adhesive layer.
  • the separate film laminated on the pressure-sensitive adhesive A was peeled off, and laminated on the surface from which the transparent substrate on the first retardation layer side of the laminate (1) was peeled off.
  • the transparent base opposite to the surface laminated on the polarizer (1) in the laminate (1) was peeled off.
  • a 25 ⁇ m-thick pressure-sensitive adhesive E was laminated as a second pressure-sensitive adhesive layer on the surface exposed by peeling off the transparent substrate.
  • the polarizing plate which consists of a positive C layer and the 2nd adhesive layer was produced.
  • the total thickness Tp of the obtained polarizing plate was 101 ⁇ m, and the thickness Ta of the pressure-sensitive adhesive layer was 31 ⁇ m.
  • Examples 2 to 6 Polarizing plates were produced in the same manner as in Example 1 except that the pressure-sensitive adhesives shown in Table 1 were used as the first pressure-sensitive adhesive and the second pressure-sensitive adhesive.
  • the total thickness Tp of the obtained polarizing plate and the thickness Ta of the pressure-sensitive adhesive layer are shown in Table 1.
  • Examples 7 to 8 The polarizing plate was produced similarly to Example 1 except having used what is shown in Table 1 as a 1st adhesive and 2nd adhesive, and using the laminated body (2) as a phase difference layer.
  • the thickness of the third pressure-sensitive adhesive layer was 5 ⁇ m.
  • the total thickness Tp of the obtained polarizing plate and the thickness Ta of the pressure-sensitive adhesive layer are shown in Table 1.
  • Comparative Example 1 The polarizing plate was produced similarly to Example 1 except having used what is shown in Table 1 as a 1st adhesive and 2nd adhesive, and using the laminated body (2) as a phase difference layer.
  • the thickness of the third pressure-sensitive adhesive layer was 5 ⁇ m. That is, the total thickness Tp ′ of the polarizing plate was 118 ⁇ m, and the thickness Ta ′ of the pressure-sensitive adhesive layer was 50 ⁇ m.
  • Comparative Example 2 Polarizing plates were produced in the same manner as in Example 1 except that the pressure-sensitive adhesives shown in Table 1 were used as the first pressure-sensitive adhesive and the second pressure-sensitive adhesive.
  • the total thickness Tp of the obtained polarizing plate and the thickness Ta of the pressure-sensitive adhesive layer are shown in Table 1.
  • the separate film of the second pressure-sensitive adhesive layer of the polarizing plate prepared as described above was peeled off and bonded to an alkali-free glass plate ("Eagle-XG" manufactured by Corning Inc.) to obtain an evaluation sample.
  • the evaluation sample was subjected to pressure treatment in an autoclave under conditions of a temperature of 50 ° C. and a pressure of 5 MPa for 20 minutes, and then left at a temperature of 23 ° C. under an atmosphere of relative humidity 60% for 1 day. Thereafter, it was left in an environment of 65 ° C. and 90% humidity. The appearance of the sample was visually confirmed after 168 hours and 336 hours after the evaluation sample was put in an environment of 65 ° C.
  • Ta / Tp is the thickness T 1 ( ⁇ m) of the first pressure-sensitive adhesive layer and the thickness T 2 ( ⁇ m) of the second pressure-sensitive adhesive layer when the polarizing plate does not contain the third pressure-sensitive adhesive layer Represents the value obtained by dividing Ta ( ⁇ m), which is the sum of the above, by the total thickness Tp ( ⁇ m) of the polarizing plate.
  • Ta ′ / Tp ′ is the thickness T 1 ( ⁇ m) of the first pressure-sensitive adhesive layer and the thickness T 2 ( ⁇ m) of the second pressure-sensitive adhesive layer in the case where the polarizing plate includes the third pressure-sensitive adhesive layer A value obtained by dividing Ta ′ ( ⁇ m), which is the sum of the thickness T 3 ( ⁇ m) of the pressure-sensitive adhesive layer, by the total thickness Tp ′ ( ⁇ m) of the polarizing plate.
  • the polarizing plates of Examples 1 to 8 have a Ta / Tp (Ta '/ Tp') of 0.40 or less, a high temperature of 65 ° C., a humidity of 90%, and a high humidity of 168 hours for 168 hours. Even after exposure, no wrinkles were observed on the polarizing plate.
  • Ta / Tp (Ta '/ Tp') was more than 0.40, and wrinkles were observed in the polarizing plate after 168 hours.
  • the polarizing plate of the present invention is applicable to an image display device which may be used in a high temperature and high humidity environment because wrinkles are not easily generated in the polarizing plate even in a high temperature and high humidity environment.

Abstract

L'invention concerne une plaque polarisante (100) qui comprend, séquentiellement dans cet ordre, un polariseur (11), une première couche adhésive (12), une couche de retard (14) et une deuxième couche adhésive (13), et qui est configurée de telle sorte que : la valeur obtenue en divisant la somme Ta (μm) de l'épaisseur T1 (µm) de la première couche adhésive (12) et de l'épaisseur T2 (µm) de la deuxième couche adhésive (13) par l'épaisseur totale Tp (µm) de la plaque polarisante (100), à savoir Ta/Tp, est inférieure ou égale à 0,40 ; et l'épaisseur du polariseur (11) est inférieure ou égale à 15 µm.
PCT/JP2018/047544 2017-12-28 2018-12-25 Plaque polarisante WO2019131625A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020207019077A KR20200103698A (ko) 2017-12-28 2018-12-25 편광판
CN201880084113.0A CN111512197B (zh) 2017-12-28 2018-12-25 偏振板

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-254273 2017-12-28
JP2017254273 2017-12-28

Publications (1)

Publication Number Publication Date
WO2019131625A1 true WO2019131625A1 (fr) 2019-07-04

Family

ID=67067390

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/047544 WO2019131625A1 (fr) 2017-12-28 2018-12-25 Plaque polarisante

Country Status (5)

Country Link
JP (1) JP2019120951A (fr)
KR (1) KR20200103698A (fr)
CN (1) CN111512197B (fr)
TW (1) TWI790337B (fr)
WO (1) WO2019131625A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021047229A (ja) * 2019-09-17 2021-03-25 住友化学株式会社 積層位相差膜
JP7181260B2 (ja) * 2019-09-17 2022-11-30 住友化学株式会社 円偏光板
JP7046127B6 (ja) * 2020-07-28 2023-12-18 日東電工株式会社 光学積層体および該光学積層体の位相差層付偏光板を含む画像表示装置
JP2022134862A (ja) * 2021-03-04 2022-09-15 日東電工株式会社 円偏光板およびそれを用いた画像表示装置

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009244486A (ja) * 2008-03-31 2009-10-22 Toagosei Co Ltd 位相差一体型複合偏光板及びそれを用いた画像表示装置
JP2011247967A (ja) * 2010-05-25 2011-12-08 Sumitomo Chemical Co Ltd 複合光学フィルム及びその製造方法
JP2012133308A (ja) * 2010-09-03 2012-07-12 Nitto Denko Corp 粘着型光学フィルム、その製造方法および画像表示装置
JP2013072951A (ja) * 2011-09-27 2013-04-22 Sumitomo Chemical Co Ltd 偏光板およびその製造方法
JP2015034851A (ja) * 2013-08-07 2015-02-19 大日本印刷株式会社 光学フィルム用転写体、光学フィルム、光学フィルム用転写体の製造方法、光学フィルムの製造方法
JP2015143848A (ja) * 2013-12-26 2015-08-06 日東電工株式会社 積層偏光フィルム、その製造方法、積層光学フィルムおよび画像表示装置
JP2017204007A (ja) * 2017-08-09 2017-11-16 住友化学株式会社 偏光板及びそれを用いた液晶表示パネル
WO2017195506A1 (fr) * 2016-05-10 2017-11-16 日東電工株式会社 Film optique pour dispositifs d'affichage électroluminescents organiques, film polarisant pour dispositifs d'affichage électroluminescents organiques, film polarisant pourvu de couche adhésive pour dispositifs d'affichage électroluminescents organiques, et dispositif d'affichage électroluminescent organique
WO2018135359A1 (fr) * 2017-01-19 2018-07-26 日東電工株式会社 Stratifié de film pour panneau tactile
JP2019008934A (ja) * 2017-06-22 2019-01-17 日東電工株式会社 有機ｅｌ表示装置用粘着剤組成物、有機ｅｌ表示装置用粘着剤層、有機ｅｌ表示装置用粘着剤層付き偏光フィルム、および有機ｅｌ表示装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6360821B2 (ja) 2015-07-22 2018-07-18 日東電工株式会社 位相差層付偏光板および画像表示装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009244486A (ja) * 2008-03-31 2009-10-22 Toagosei Co Ltd 位相差一体型複合偏光板及びそれを用いた画像表示装置
JP2011247967A (ja) * 2010-05-25 2011-12-08 Sumitomo Chemical Co Ltd 複合光学フィルム及びその製造方法
JP2012133308A (ja) * 2010-09-03 2012-07-12 Nitto Denko Corp 粘着型光学フィルム、その製造方法および画像表示装置
JP2013072951A (ja) * 2011-09-27 2013-04-22 Sumitomo Chemical Co Ltd 偏光板およびその製造方法
JP2015034851A (ja) * 2013-08-07 2015-02-19 大日本印刷株式会社 光学フィルム用転写体、光学フィルム、光学フィルム用転写体の製造方法、光学フィルムの製造方法
JP2015143848A (ja) * 2013-12-26 2015-08-06 日東電工株式会社 積層偏光フィルム、その製造方法、積層光学フィルムおよび画像表示装置
WO2017195506A1 (fr) * 2016-05-10 2017-11-16 日東電工株式会社 Film optique pour dispositifs d'affichage électroluminescents organiques, film polarisant pour dispositifs d'affichage électroluminescents organiques, film polarisant pourvu de couche adhésive pour dispositifs d'affichage électroluminescents organiques, et dispositif d'affichage électroluminescent organique
WO2018135359A1 (fr) * 2017-01-19 2018-07-26 日東電工株式会社 Stratifié de film pour panneau tactile
JP2019008934A (ja) * 2017-06-22 2019-01-17 日東電工株式会社 有機ｅｌ表示装置用粘着剤組成物、有機ｅｌ表示装置用粘着剤層、有機ｅｌ表示装置用粘着剤層付き偏光フィルム、および有機ｅｌ表示装置
JP2017204007A (ja) * 2017-08-09 2017-11-16 住友化学株式会社 偏光板及びそれを用いた液晶表示パネル

Also Published As

Publication number Publication date
JP2019120951A (ja) 2019-07-22
KR20200103698A (ko) 2020-09-02
CN111512197B (zh) 2022-05-13
TWI790337B (zh) 2023-01-21
CN111512197A (zh) 2020-08-07
TW201937213A (zh) 2019-09-16

Similar Documents

Publication Publication Date Title
WO2019131624A1 (fr) Plaque de polarisation
WO2019131625A1 (fr) Plaque polarisante
KR102362344B1 (ko) 점착제층 부착 광학 필름
KR102362343B1 (ko) 점착제층 부착 광학 필름
JP6043315B2 (ja) 偏光子保護フィルム、その製造方法、偏光板、光学フィルムおよび画像表示装置
KR102444987B1 (ko) 점착성 조성물, 점착제, 점착 시트 및 점착제층 부착 광학 필름
TWI690738B (zh) 複合偏光板及使用該偏光板之液晶面板
CN106003940B (zh) 附有粘着剂层的光学薄膜
KR20210008003A (ko) 편광판 및 표시 장치
JP2019159200A (ja) 光学積層体の製造方法及び粘着層付き光学積層体の製造方法
TWI706172B (zh) 偏光板組及液晶面板
TWI795573B (zh) 偏光板
TWI809198B (zh) 液晶層積層體
JP2019159199A (ja) 粘着層付き光学積層体の製造方法
JP6837282B2 (ja) 粘着剤層付き光学フィルム
JP2021131532A (ja) 光学積層体
JP7169159B2 (ja) 液晶層積層体
TW202132101A (zh) 光學積層體、附貼合層的光學積層體及其製造方法
JP2019159198A (ja) 光学積層体の製造方法及び粘着層付き光学積層体の製造方法
WO2021166578A1 (fr) Corps optique multicouche
TW202340770A (zh) 偏光板
TW202140711A (zh) 偏光板、附黏著劑層之偏光板及圖像顯示裝置
TW202346089A (zh) 光學積層體及顯示系統
JP2024019596A (ja) 光学積層体の製造方法及び光学積層体
CN114341682A (zh) 带粘合剂层的偏振膜层叠体、及使用该带粘合剂层的偏振膜层叠体的光学显示面板

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18894937

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18894937

Country of ref document: EP

Kind code of ref document: A1