WO2021054272A1 - Polarizing plate with adhesive layer and image display device - Google Patents

Polarizing plate with adhesive layer and image display device Download PDF

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Publication number
WO2021054272A1
WO2021054272A1 PCT/JP2020/034634 JP2020034634W WO2021054272A1 WO 2021054272 A1 WO2021054272 A1 WO 2021054272A1 JP 2020034634 W JP2020034634 W JP 2020034634W WO 2021054272 A1 WO2021054272 A1 WO 2021054272A1
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film
cured product
polarizing plate
layer
resin
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PCT/JP2020/034634
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French (fr)
Japanese (ja)
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智 永安
純▲セン▼ 許
岩田　智
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住友化学株式会社
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Priority to CN202080065065.8A priority Critical patent/CN114402238A/en
Priority to KR1020227009838A priority patent/KR20220063183A/en
Publication of WO2021054272A1 publication Critical patent/WO2021054272A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • 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
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • 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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • 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
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
    • 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
    • C09J2301/302—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 the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C

Definitions

  • the polarizing plate with an adhesive layer of the present invention even when the display device is viewed from an angle of ⁇ of 30 ° to 90 ° (especially 40 ° to 90 °, particularly 80 ° to 90 °). , Light leakage of the polarizing plate can be suppressed.
  • the epoxy compound is a compound having one or more (preferably two or more) epoxy groups in the molecule.
  • examples of the epoxy compound include an alicyclic epoxy compound, an aromatic epoxy compound, and an aliphatic epoxy compound.
  • novolac-type epoxy resins such as phenol novolac epoxy resin, cresol novolac epoxy resin, hydroxybenzaldehyde phenol novolac epoxy resin; glycidyl ether of 2,2', 4,4'-tetrahydroxydiphenylmethane, 2,2', 4 , 4'-Polyfunctional epoxy compounds such as tetrahydroxybenzophenone glycidyl ether; polyfunctional epoxy resins such as epoxidized polyvinylphenol.
  • the aliphatic epoxy compound is a compound having at least one oxylan ring (three-membered cyclic ether) bonded to an aliphatic carbon atom in the molecule.
  • monofunctional epoxy compounds such as butyl glycidyl ether and 2-ethylhexyl glycidyl ether; bifunctional such as 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether and neopentyl glycol diglycidyl ether.
  • An oxetane compound is a compound containing one or more oxetane rings (oxetanyl groups) in the molecule. Specifically, for example, 3-ethyl-3-hydroxymethyloxetane (also called oxetane alcohol), 2-ethylhexyloxetane, 1,4-bis [ ⁇ (3-ethyloxetane-3-yl) methoxy ⁇ methyl].
  • the first cured product layer 2 is, for example, an active energy ray-curable adhesive composition coated on a polarizing film 1 or a first resin film 3 and irradiated with active energy rays. It can be obtained by curing the adhesive composition.
  • a known coating method such as a doctor blade, a wire bar, a die coater, a comma coater, and a gravure coater can be used for coating the active energy ray-curable adhesive composition.
  • the integrated light intensity is too small, the generation of active species derived from the polymerization initiator may not be sufficient, and the resulting curing may be insufficient. Further, if the integrated light amount is too large, the irradiation time becomes very long, which is disadvantageous for improving productivity.
  • the thickness of the first cured product layer 2 is not particularly limited, but is preferably 0.1 ⁇ m or more, more preferably 0.5 ⁇ m or more, further preferably 1 ⁇ m or more, and 2.1 ⁇ m or more. It is particularly preferable to have. Further, it is preferably 20 ⁇ m or less, more preferably 10 ⁇ m or less, and further preferably 5 ⁇ m or less.
  • the resin-cured layer is not particularly limited as long as the average refractive index difference is within a predetermined range, but is usually a layer formed from a resin composition and is a resin. It is a cured product layer of the composition. Specific examples thereof include a layer formed from an aqueous resin composition, a layer formed from an active energy ray-curable composition, and the like.
  • the adhesive layer surface is attached to the center of a glass substrate [“Eagle XG” manufactured by Corning Inc.] having a thickness of 0.7 mm to form a laminate. Obtained.
  • the obtained laminate was placed on the backlight so that the polarizing plate portion of 10 mm (MD) ⁇ 50 mm (TD) out of 50 mm ⁇ 50 mm protruded from the bright part of the backlight.
  • the polarizing plate (40 mm ⁇ 50 mm) in the bright part of the backlight and the entire bright part of the backlight were covered with a black acrylic plate.
  • the polarizing plate with an adhesive layer of the present invention suppresses light leakage even when viewed from substantially sideways at 85 ° from the surface of the polarizing plate. Therefore, when the polarizing plate with the adhesive layer of the present invention is incorporated into a display device in which the height of the bezel provided in the display device is lowered or the bezel is omitted, light leakage occurs even if the end portion of the polarizing plate is exposed. It is suppressed.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Engineering & Computer Science (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)

Abstract

[Problem] To provide a polarizing plate that can limit light leakage from an end section thereof, even if incorporated into a display device in which the width of a bezel has been narrowed or a display device in which the height of a bezel has been lowered. [Solution] This polarizing plate with an adhesive layer comprises, in the following order: a polarizing film; a first cured product layer; a first resin film; and an adhesive layer. The polarizing film and the first cured product layer are in direct contact with each other, the first cured product layer and the first resin film are in direct contact with each other, and the first resin film and the adhesive layer are in direct contact with each other. The absolute value of the difference between the average refractive index of the first cured product layer and the average refractive index of the first resin film is 0.03 or less.

Description

粘着剤層付き偏光板及び画像表示装置Polarizing plate with adhesive layer and image display device
　本発明は、粘着剤層付き偏光板及び該偏光板を含む画像表示装置に関する。 The present invention relates to a polarizing plate with an adhesive layer and an image display device including the polarizing plate.
　偏光板は、偏光フィルムの少なくとも一方の面に接着剤層を介して保護フィルムが積層された構成を有している。偏光板は一般的には粘着剤層を介して表示装置に組み込まれる（例えば、特許文献１）。このような表示装置は、一般的に、外部からの衝撃を抑制するために、ベゼルと称される金属枠を設けて表示装置の外周を保護している。 The polarizing plate has a structure in which a protective film is laminated on at least one surface of the polarizing film via an adhesive layer. The polarizing plate is generally incorporated into a display device via an adhesive layer (for example, Patent Document 1). In such a display device, generally, in order to suppress an impact from the outside, a metal frame called a bezel is provided to protect the outer periphery of the display device.
特開２００９－４２３８３号公報Japanese Unexamined Patent Publication No. 2009-42383
　近年、表示装置は一層のスリム化及び大画面化を求められる傾向にある。このような傾向に伴い、ベゼルの幅を狭くしたり、ベゼルの高さを低くしたり、ベゼルを省略することで同じサイズの表示装置であったとしてもディスプレイ画面を大きくすることが提案されている。しかしながら、ベゼルの幅を狭めた場合、ベゼルの高さを低くした場合又はベゼルを省略した場合の表示装置に偏光板を組み込むと、表示装置に組み込まれた偏光板の端部が露出することになり、表示装置の電源を入れた際にバックライトや有機発光素子から出た光が偏光板の端部より漏れる場合があることがわかった。 In recent years, display devices have tended to be required to be slimmer and have a larger screen. Along with this tendency, it has been proposed to narrow the width of the bezel, reduce the height of the bezel, or omit the bezel to enlarge the display screen even if the display device is the same size. There is. However, when the polarizing plate is incorporated in the display device when the width of the bezel is narrowed, the height of the bezel is lowered, or the bezel is omitted, the end portion of the polarizing plate incorporated in the display device is exposed. Therefore, it was found that the light emitted from the backlight or the organic light emitting element may leak from the end of the polarizing plate when the power of the display device is turned on.
　本発明は以下の発明を含む。
［１］偏光フィルム、第１硬化物層、第１樹脂フィルム、粘着剤層をこの順に備える粘着剤層付き偏光板であって、
　偏光フィルムと第１硬化物層とは直接接しており、
　第一硬化物層と第１樹脂フィルムとは直接接しており、
　第一樹脂フィルムと粘着剤層とは直接接しており、
　第１硬化物層の平均屈折率と第１樹脂フィルムの平均屈折率との差の絶対値が０．０３以下である、粘着剤層付き偏光板。
［２］第１硬化物層が、活性エネルギー線硬化性組成物の硬化物である［１］に記載の偏光板。
［３］第１硬化物層の屈折率が１．５５以下である［１］又は［２］に記載の偏光板。
［４］第１樹脂フィルムが、熱可塑性樹脂から形成されるフィルムを含む［１］～［３］のいずれかに記載の偏光板。
［５］第１樹脂フィルムの厚みが６μｍ以上である［１］～［４］のいずれかに記載の偏光板。
［６］偏光フィルムの第１硬化物層とは他方の面に、第２硬化物層を介して第２樹脂フィルムを備える［１］～［５］のいずれかに記載の偏光板。
［７］画像表示パネルと、前記画像表示パネルの視認側に配置された［１］～［６］のいずれかに記載の粘着剤層付き偏光板とを含む画像表示装置。 The present invention includes the following inventions.
[1] A polarizing plate with an adhesive layer comprising a polarizing film, a first cured product layer, a first resin film, and an adhesive layer in this order.
The polarizing film and the first cured product layer are in direct contact with each other.
The first cured product layer and the first resin film are in direct contact with each other.
The first resin film and the adhesive layer are in direct contact with each other.
A polarizing plate with an adhesive layer, wherein the absolute value of the difference between the average refractive index of the first cured product layer and the average refractive index of the first resin film is 0.03 or less.
[2] The polarizing plate according to [1], wherein the first cured product layer is a cured product of an active energy ray-curable composition.
[3] The polarizing plate according to [1] or [2], wherein the refractive index of the first cured product layer is 1.55 or less.
[4] The polarizing plate according to any one of [1] to [3], wherein the first resin film contains a film formed of a thermoplastic resin.
[5] The polarizing plate according to any one of [1] to [4], wherein the thickness of the first resin film is 6 μm or more.
[6] The polarizing plate according to any one of [1] to [5], wherein a second resin film is provided on a surface of the polarizing film opposite to the first cured product layer via a second cured product layer.
[7] An image display device including an image display panel and a polarizing plate with an adhesive layer according to any one of [1] to [6], which is arranged on the visual side of the image display panel.
　本発明の偏光板は、ベゼルの幅を狭くした表示装置、ベゼルの高さを低くした表示装置、又はベゼルを省略した表示装置に組み込んだとしても、偏光板の端部からの光漏れを抑制することができる。 The polarizing plate of the present invention suppresses light leakage from the end of the polarizing plate even if it is incorporated in a display device having a narrow bezel width, a display device having a low bezel height, or a display device in which the bezel is omitted. can do.
本発明の偏光板の一様態である構成を示す断面図を表す。A cross-sectional view showing a uniform structure of the polarizing plate of the present invention is shown. 本発明の画像表示装置の一様態である構成を示す断面図を表す。A cross-sectional view showing a uniform configuration of the image display device of the present invention is shown. 本発明の画像表示装置における光漏れの確認方法を示す断面図を表す。A cross-sectional view showing a method for confirming light leakage in the image display device of the present invention is shown.
　以下、本発明の実施の形態について、詳細に説明する。なお、本発明の範囲はここで説明する実施の形態に限定されるものではなく、本発明の趣旨を損なわない範囲で種々の変更をすることができる。 Hereinafter, embodiments of the present invention will be described in detail. The scope of the present invention is not limited to the embodiments described here, and various modifications can be made without impairing the gist of the present invention.
　本発明の偏光板の一実施態様における構成を図１に基づいて説明すると、本発明の偏光板１０は、偏光フィルム１の一方の面に、第１硬化物層２と第１樹脂フィルム３とがこの順に積層される。また、本発明の偏光板は、図２に示すように、偏光フィルム１の第１硬化物層２とは反対側の面に、第２硬化物層４を介して第２樹脂フィルム５が備えられた構成を有していてもよい。また、粘着剤層６を介してパネル７と積層させて表示装置３０としてもよい。
　以下、本発明の偏光板の各構成成分について詳細に説明する。 The configuration of the polarizing plate of the present invention in one embodiment will be described with reference to FIG. 1. The polarizing plate 10 of the present invention has a first cured product layer 2 and a first resin film 3 on one surface of the polarizing film 1. Are stacked in this order. Further, as shown in FIG. 2, the polarizing plate of the present invention includes a second resin film 5 via a second cured product layer 4 on a surface of the polarizing film 1 opposite to the first cured product layer 2. It may have the above-mentioned configuration. Further, the display device 30 may be laminated with the panel 7 via the adhesive layer 6.
Hereinafter, each component of the polarizing plate of the present invention will be described in detail.
［粘着剤層付き偏光板］
　本発明の粘着剤層付き偏光板は、偏光フィルム１、第１硬化物層２、第１樹脂フィルム３、粘着剤６をこの順に備える。本発明の粘着剤層付き偏光板は、第１硬化物層２の平均屈折率と第１樹脂フィルム３の平均屈折率との差の絶対値が０．０３以下である。また偏光フィルム１と第１硬化物層２とは直接接しており、第１硬化物層２と第１樹脂フィルム３とは直接接しており、第１樹脂フィルム３と粘着剤層６とは直接接している。
　なお、本発明における平均屈折率は第長５８９ｎｍでの平均屈折率を表す。 [Polarizing plate with adhesive layer]
The polarizing plate with an adhesive layer of the present invention includes a polarizing film 1, a first cured product layer 2, a first resin film 3, and an adhesive 6 in this order. In the polarizing plate with an adhesive layer of the present invention, the absolute value of the difference between the average refractive index of the first cured product layer 2 and the average refractive index of the first resin film 3 is 0.03 or less. Further, the polarizing film 1 and the first cured product layer 2 are in direct contact with each other, the first cured product layer 2 and the first resin film 3 are in direct contact with each other, and the first resin film 3 and the pressure-sensitive adhesive layer 6 are in direct contact with each other. I'm in contact.
The average refractive index in the present invention represents the average refractive index at a length of 589 nm.
　本発明の粘着剤層付き偏光板は、第１硬化物層２の平均屈折率ｎ２と第１樹脂フィルム３の平均屈折率の差の絶対値が、０．０３以下、好ましくは０．０２５以下、より好ましくは０．０２以下、さらに好ましくは０．０１以下である。第１硬化物層２の平均屈折率と第１樹脂フィルム３の屈折率との差がこの範囲を満たすことにより、偏光板を表示装置に適用した際に、偏光板端部からの光漏れを効果的に抑制することができる。
　本発明における偏光板端部からの光漏れとは、図３に基づいて説明すると、表示装置３０の電源を入れ、表示装置の正面から断面方向にθ（°）傾いた角度から表示装置を見た時に、表示装置から出た光が偏光板の断面から漏れ出て、偏光板の断面が光って見えることをいう。θが大きいほど（例えば１５°～９０°）光漏れは強く視認される傾向にあり、θが４０°を超えた場合（特に８０°を超えた場合）に、光漏れは顕著に視認される。本発明の粘着剤層付偏光板によれば、θが３０°～９０°（なかでも４０°～９０°、特に８０°～９０°）の角度から表示装置を見た場合であったとしても、偏光板の光漏れを抑制できる。 In the polarizing plate with an adhesive layer of the present invention, the absolute value of the difference between the average refractive index n2 of the first cured product layer 2 and the average refractive index of the first resin film 3 is 0.03 or less, preferably 0.025 or less. , More preferably 0.02 or less, still more preferably 0.01 or less. When the difference between the average refractive index of the first cured product layer 2 and the refractive index of the first resin film 3 satisfies this range, light leakage from the end of the polarizing plate is prevented when the polarizing plate is applied to the display device. It can be effectively suppressed.
The light leakage from the end of the polarizing plate in the present invention will be described with reference to FIG. 3. When the power of the display device 30 is turned on, the display device is viewed from an angle of θ (°) tilted in the cross-sectional direction from the front of the display device. At that time, the light emitted from the display device leaks from the cross section of the polarizing plate, and the cross section of the polarizing plate appears to shine. The larger θ (for example, 15 ° to 90 °), the stronger the light leakage tends to be visible, and when θ exceeds 40 ° (especially when it exceeds 80 °), the light leakage is noticeably visible. .. According to the polarizing plate with an adhesive layer of the present invention, even when the display device is viewed from an angle of θ of 30 ° to 90 ° (especially 40 ° to 90 °, particularly 80 ° to 90 °). , Light leakage of the polarizing plate can be suppressed.
＜第１硬化物層＞
　第１硬化物層２は、第１樹脂フィルムとの平均屈折率差が所定の範囲となれば、特に制限はないが、通常、樹脂組成物から形成される層であり、樹脂組成物の硬化物層である。具体的には、第１硬化物層２としては粘着剤組成物から形成される層（粘着剤層）、水系接着剤組成物から形成される層、活性エネルギー線硬化型接着剤組成物から形成された層等が挙げられる。中でも、平均屈折率の調整が容易に可能であることから、活性エネルギー線硬化型接着剤組成物から形成される層（活性エネルギー線硬化型接着剤組成物の硬化物層）であることが好ましい。 <First cured product layer>
The first cured product layer 2 is not particularly limited as long as the average refractive index difference from the first resin film is within a predetermined range, but is usually a layer formed from the resin composition, and the cured resin composition is cured. It is a physical layer. Specifically, the first cured product layer 2 is formed from a layer formed from the pressure-sensitive adhesive composition (sticking material layer), a layer formed from the water-based adhesive composition, and an active energy ray-curable adhesive composition. Examples include the layers that have been formed. Among them, a layer formed from the active energy ray-curable adhesive composition (cured product layer of the active energy ray-curable adhesive composition) is preferable because the average refractive index can be easily adjusted. ..
　活性エネルギー線硬化型接着剤組成物は、活性エネルギー線の照射を受けて硬化する組成物である。例えば、カチオン重合性化合物とカチオン重合開始剤を含有するカチオン重合性の活性エネルギー線硬化型接着剤組成物（以下、光カチオン重合性硬化型接着剤組成物という場合がある。）、ラジカル重合性化合物とラジカル重合開始剤を含有するラジカル重合性の活性エネルギー線硬化型接着剤組成物（以下、光ラジカル重合性硬化型接着剤組成物という場合がある。）、カチオン重合性化合物及びラジカル重合性化合物の両者を含有し、そこにカチオン重合開始剤及びラジカル重合開始剤を配合した活性エネルギー線硬化型接着剤組成物、及び開始剤を含まない活性エネルギー線硬化型接着剤に電子ビームを照射することで硬化させる電子線硬化型接着剤組成物等が挙げられる。 The active energy ray-curable adhesive composition is a composition that cures by being irradiated with active energy rays. For example, a cationically polymerizable active energy ray-curable adhesive composition containing a cationically polymerizable compound and a cationically polymerizable initiator (hereinafter, may be referred to as a photocationically polymerizable curable adhesive composition), radically polymerizable. A radically polymerizable active energy ray-curable adhesive composition containing a compound and a radical polymerization initiator (hereinafter, may be referred to as a photoradical polymerizable curable adhesive composition), a cationically polymerizable compound and a radically polymerizable adhesive. An electron beam is applied to an active energy ray-curable adhesive composition containing both of the compounds and containing a cationic polymerization initiator and a radical polymerization initiator, and an active energy ray-curable adhesive containing no initiator. Examples thereof include an electron beam-curable adhesive composition that is cured by this.
　カチオン重合性化合物は、紫外線、可視光、電子線、Ｘ線等の活性エネルギー線の照射や加熱によりカチオン重合反応が進行し、硬化する化合物又はオリゴマーをいい、具体的には、エポキシ化合物、オキセタン化合物、ビニル化合物等が挙げられる。活性エネルギー線硬化型接着剤組成物は２種以上のカチオン重合性化合物を使用してもよい。 The cationically polymerizable compound refers to a compound or oligomer in which the cationic polymerization reaction proceeds by irradiation or heating with active energy rays such as ultraviolet rays, visible light, electron beams, and X rays, and is cured. Specifically, an epoxy compound and oxetane. Examples include compounds and vinyl compounds. Two or more kinds of cationically polymerizable compounds may be used in the active energy ray-curable adhesive composition.
　エポキシ化合物とは、分子内に１個以上（好ましくは２個以上）のエポキシ基を有する化合物である。エポキシ化合物としては、脂環式エポキシ化合物、芳香族エポキシ化合物、脂肪族エポキシ化合物等を挙げることができる。 The epoxy compound is a compound having one or more (preferably two or more) epoxy groups in the molecule. Examples of the epoxy compound include an alicyclic epoxy compound, an aromatic epoxy compound, and an aliphatic epoxy compound.
　脂環式エポキシ化合物は、脂環式環に結合したエポキシ基を分子内に１個以上有する化合物であり、例えば、３，４－エポキシシクロヘキシルメチル　３，４－エポキシシクロヘキサンカルボキシレート、３，４－エポキシ－６－メチルシクロヘキシルメチル　３，４－エポキシ－６－メチルシクロヘキサンカルボキシレート、エチレンビス（３，４－エポキシシクロヘキサンカルボキシレート）、ビス（３，４－エポキシシクロヘキシルメチル）　アジペート、ビス（３，４－エポキシ－６－メチルシクロヘキシルメチル）　アジペート、ジエチレングリコールビス（３，４－エポキシシクロヘキシルメチルエーテル）、エチレングリコールビス（３，４－エポキシシクロヘキシルメチルエーテル）、２，３，１４，１５－ジエポキシ－７，１１，１８，２１－テトラオキサトリスピロ［５.２.２.５.２.２］ヘンイコサン、３－（３，４－エポキシシクロヘキシル）－８，９－エポキシ－１，５－ジオキサスピロ［５.５］ウンデカン、４－ビニルシクロヘキセンジオキサイド、リモネンジオキサイド、ビス（２，３－エポキシシクロペンチル）エーテル、ジシクロペンタジエンジオキサイドが挙げられる。 The alicyclic epoxy compound is a compound having at least one epoxy group bonded to the alicyclic ring in the molecule. For example, 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate, 3,4- Epoxy-6-methylcyclohexylmethyl 3,4-epoxy-6-methylcyclohexanecarboxylate, ethylenebis (3,4-epoxycyclohexanecarboxylate), bis (3,4-epoxycyclohexylmethyl) adipate, bis (3,4) -Epoxy-6-methylcyclohexylmethyl) adipate, diethylene glycol bis (3,4-epoxycyclohexylmethyl ether), ethylene glycol bis (3,4-epoxycyclohexylmethyl ether), 2,3,14,15-diepoxy-7, 11,18,21-Tetraoxatrispyro [5.2.2.5.2.2] Henikosan, 3- (3,4-epoxycyclohexyl) -8,9-epoxy-1,5-dioxaspiro [5. 5] Undecane, 4-vinylcyclohexendioxide, limonendioxide, bis (2,3-epoxycyclopentyl) ether, dicyclopentadiendioxide.
　芳香族エポキシ化合物は、分子内に芳香族環とエポキシ基とを有する化合物であり、ビスフェノールＡのジグリシジルエーテル、ビスフェールＦのジグリシジルエーテル、ビスフェノールＳのジグリシジルエーテル等のビスフェノール型エポキシ化合物またはそのオリゴマー；フェノールノボラックエポキシ樹脂、クレゾールノボラックエポキシ樹脂、ヒドロキシベンズアルデヒドフェノールノボラックエポキシ樹脂等のノボラック型のエポキシ樹脂；２，２’，４，４’－テトラヒドロキシジフェニルメタンのグリシジルエーテル、２，２’，４，４’－テトラヒドロキシベンゾフェノンのグリシジルエーテル等の多官能型のエポキシ化合物；エポキシ化ポリビニルフェノール等の多官能型のエポキシ樹脂が挙げられる。 The aromatic epoxy compound is a compound having an aromatic ring and an epoxy group in the molecule, and is a bisphenol type epoxy compound such as bisphenol A diglycidyl ether, bisfer F diglycidyl ether, bisphenol S diglycidyl ether, or the like. Its oligomers; novolac-type epoxy resins such as phenol novolac epoxy resin, cresol novolac epoxy resin, hydroxybenzaldehyde phenol novolac epoxy resin; glycidyl ether of 2,2', 4,4'-tetrahydroxydiphenylmethane, 2,2', 4 , 4'-Polyfunctional epoxy compounds such as tetrahydroxybenzophenone glycidyl ether; polyfunctional epoxy resins such as epoxidized polyvinylphenol.
　脂肪族エポキシ化合物は、脂肪族炭素原子に結合するオキシラン環（３員の環状エーテル）を分子内に少なくとも１個有する化合物である。例えば、ブチルグリシジルエーテル、２－エチルヘキシルグリシジルエーテル等の単官能のエポキシ化合物；１，４－ブタンジオールジグリシジルエーテル、１，６－ヘキサンジオールジグリシジルエーテル、ネオペンチルグリコールジグリシジルエーテル等の２官能のエポキシ化合物；トリメチロールプロパントリグリシジルエーテル、ペンタエリスリトールテトラグリシジルエーテル等の３官能以上のエポキシ化合物；４－ビニルシクロヘキセンジオキサイド、リモネンジオキサイド等の、脂環式環に直接結合するエポキシ基１個と、脂肪族炭素原子に結合するオキシラン環とを有するエポキシ化合物等が挙げられる。 The aliphatic epoxy compound is a compound having at least one oxylan ring (three-membered cyclic ether) bonded to an aliphatic carbon atom in the molecule. For example, monofunctional epoxy compounds such as butyl glycidyl ether and 2-ethylhexyl glycidyl ether; bifunctional such as 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether and neopentyl glycol diglycidyl ether. Epoxy compounds; Trifunctional or higher functional epoxy compounds such as trimethylolpropan triglycidyl ether and pentaerythritol tetraglycidyl ether; with one epoxy group directly bonded to the alicyclic ring such as 4-vinylcyclohexendioxide and limonendioxide. , An epoxy compound having an oxylane ring bonded to an aliphatic carbon atom and the like.
　オキセタン化合物は、分子内に１個以上のオキセタン環（オキセタニル基）を含有する化合物である。具体的には、例えば、３－エチル－３－ヒドロキシメチルオキセタン（オキセタンアルコールとも呼ばれる。）、２－エチルヘキシルオキセタン、１，４－ビス〔｛（３－エチルオキセタン－３－イル）メトキシ｝メチル〕ベンゼン（キシリレンビスオキセタンとも呼ばれる。）、３－エチル－３〔｛（３－エチルオキセタン－３－イル）メトキシ｝メチル〕オキセタン、３－エチル－３－（フェノキシメチル）オキセタン、３－（シクロヘキシルオキシ）メチル－３－エチルオキセタンが挙げられる。オキセタン化合物は、カチオン重合性化合物の主成分として用いてもよいし、エポキシ化合物と併用してもよい。 An oxetane compound is a compound containing one or more oxetane rings (oxetanyl groups) in the molecule. Specifically, for example, 3-ethyl-3-hydroxymethyloxetane (also called oxetane alcohol), 2-ethylhexyloxetane, 1,4-bis [{(3-ethyloxetane-3-yl) methoxy} methyl]. Benzene (also called xylylenebis oxetane), 3-ethyl-3 [{(3-ethyloxetane-3-yl) methoxy} methyl] oxetane, 3-ethyl-3- (phenoxymethyl) oxetane, 3- (cyclohexyl) Oxy) Methyl-3-ethyloxetane can be mentioned. The oxetane compound may be used as the main component of the cationically polymerizable compound, or may be used in combination with the epoxy compound.
　ビニル化合物としては、脂肪族または脂環式のビニルエーテル化合物が挙げられる。例えば、ｎ－アミルビニルエーテル、ｉ－アミルビニルエーテル、ｎ－ヘキシルビニルエーテル、ｎ－オクチルビニルエーテル、２－エチルヘキシルビニルエーテル、ｎ－ドデシルビニルエーテル、ステアリルビニルエーテル、オレイルビニルエーテル等の炭素数５～２０のアルキルまたはアルケニルアルコールのビニルエーテル；２－ヒドロキシエチルビニルエーテル、３－ヒドロキシプロピルビニルエーテル、４－ヒドロキシブチルビニルエーテル等の水酸基含有ビニルエーテル；シクロヘキシルビニルエーテル、２－メチルシクロヘキシルビニルエーテル、シクロヘキシルメチルビニルエーテル、ベンジルビニルエーテル等の脂肪族環または芳香族環を有するモノアルコールのビニルエーテル；グリセロールモノビニルエーテル、１，４－ブタンジオールモノビニルエーテル、１，４－ブタンジオールジビニルエーテル、１，６－ヘキサンジオールジビニルエーテル、ネオペンチルグリコールジビニルエーテル、ペンタエリトリトールジビニルエーテル、ペンタエリトリトールテトラビニルエーテル、トリメチロールプロパンジビニルエーテル、トリメチロールプロパントリビニルエーテル、１，４－ジヒドロキシシクロヘキサンモノビニルエーテル、１，４－ジヒドロキシシクロヘキサンジビニルエーテル、１，４－ジヒドロキシメチルシクロヘキサンモノビニルエーテル、１，４－ジヒドロキシメチルシクロヘキサンジビニルエーテル等の多価アルコールのモノ～ポリビニルエーテル；ジエチレングリコールジビニルエーテル、トリエチレングリコールジビニルエーテル、ジエチレングリコールモノブチルモノビニルエーテル等のポリアルキレングリコールモノ～ジビニルエーテル；グリシジルビニルエーテル、エチレングリコールビニルエーテルメタクリレート等のその他のビニルエーテルを含む。 Examples of the vinyl compound include an aliphatic or alicyclic vinyl ether compound. For example, an alkyl or alkenyl alcohol having 5 to 20 carbon atoms such as n-amyl vinyl ether, i-amyl vinyl ether, n-hexyl vinyl ether, n-octyl vinyl ether, 2-ethylhexyl vinyl ether, n-dodecyl vinyl ether, stearyl vinyl ether, and oleyl vinyl ether. Vinyl ether; hydroxyl group-containing vinyl ether such as 2-hydroxyethyl vinyl ether, 3-hydroxypropyl vinyl ether, 4-hydroxybutyl vinyl ether; aliphatic ring or aromatic ring such as cyclohexyl vinyl ether, 2-methylcyclohexylvinyl ether, cyclohexylmethylvinyl ether, benzylvinyl ether Monoalcohol vinyl ether; glycerol monovinyl ether, 1,4-butanediol monovinyl ether, 1,4-butanediol divinyl ether, 1,6-hexanediol divinyl ether, neopentyl glycol divinyl ether, pentaerythritol divinyl ether, pentaerythritol Tetravinyl ether, trimethylolpropane divinyl ether, trimethylolpropane trivinyl ether, 1,4-dihydroxycyclohexane monovinyl ether, 1,4-dihydroxycyclohexanedivinyl ether, 1,4-dihydroxymethylcyclohexane monovinyl ether, 1,4-dihydroxymethylcyclohexane Mono-polyvinyl ethers of polyhydric alcohols such as divinyl ethers; polyalkylene glycol mono-divinyl ethers such as diethylene glycol divinyl ethers, triethylene glycol divinyl ethers and diethylene glycol monobutyl monovinyl ethers; other vinyl ethers such as glycidyl vinyl ethers and ethylene glycol vinyl ether methacrylates. including.
　カチオン重合開始剤は、光カチオン重合開始剤であることが好ましい。光カチオン重合開始剤は、活性エネルギー線の照射によって、カチオン種またはルイス酸を発生し、カチオン硬化性化合物の重合反応を開始させるものである。光カチオン重合開始剤は、光で触媒的に作用するため、光カチオン重合性化合物に混合しても保存安定性や作業性に優れる。光カチオン重合開始剤としては、例えば、芳香族ヨードニウム塩や芳香族スルホニウム塩等のオニウム塩、芳香族ジアゾニウム塩、鉄－アレーン錯体等を挙げることができる。活性エネルギー線硬化型接着剤組成物は２種以上のカチオン重合開始剤を使用してもよい。カチオン重合開始剤の含有量は、カチオン重合性化合物１００質量部に対して、通常、０．５～１０質量部である。 The cationic polymerization initiator is preferably a photocationic polymerization initiator. The photocationic polymerization initiator generates a cationic species or Lewis acid by irradiation with active energy rays to initiate a polymerization reaction of a cationically curable compound. Since the photocationic polymerization initiator acts catalytically with light, it is excellent in storage stability and workability even when mixed with a photocationic polymerizable compound. Examples of the photocationic polymerization initiator include onium salts such as aromatic iodonium salts and aromatic sulfonium salts, aromatic diazonium salts, iron-allene complexes and the like. Two or more kinds of cationic polymerization initiators may be used in the active energy ray-curable adhesive composition. The content of the cationic polymerization initiator is usually 0.5 to 10 parts by mass with respect to 100 parts by mass of the cationically polymerizable compound.
　ラジカル重合性化合物は、活性エネルギー線の照射や加熱によりラジカル重合反応が進行し、硬化する化合物またはオリゴマーをいい、具体的にはエチレン性不飽和結合を有する化合物等が挙げられる。エチレン性不飽和結合を有する化合物としては、分子内に１個以上の（メタ）アクリロイル基を有する（メタ）アクリル系化合物；スチレン、スチレンスルホン酸、酢酸ビニル、プロピオン酸ビニル、Ｎ－ビニル－２－ピロリドン等のビニル化合物等が挙げられる。ここで、（メタ）アクリロイル基とは、アクリロイル基又はメタアクリロイル基のいずれでもよいことを意味し、他に（メタ）アクリレートなどというときの「（メタ）」も同様の趣旨である。
　活性エネルギー線硬化型接着剤組成物は２種以上のラジカル重合性化合物を使用してもよい。 The radically polymerizable compound refers to a compound or an oligomer in which a radical polymerization reaction proceeds by irradiation or heating with active energy rays and is cured, and specific examples thereof include a compound having an ethylenically unsaturated bond. Compounds having an ethylenically unsaturated bond include (meth) acrylic compounds having one or more (meth) acryloyl groups in the molecule; styrene, styrene sulfonic acid, vinyl acetate, vinyl propionate, N-vinyl-2. -Vinyl compounds such as pyrrolidone can be mentioned. Here, the (meth) acryloyl group means that it may be either an acryloyl group or a meta-acryloyl group, and "(meth)" in the case of (meth) acrylate or the like has the same meaning.
Two or more radically polymerizable compounds may be used in the active energy ray-curable adhesive composition.
　ラジカル重合開始剤は、光ラジカル重合開始剤であることが好ましい。光ラジカル重合開始剤は、活性エネルギー線の照射によってラジカル重合性化合物の重合反応を開始させるものである。光ラジカル重合開始剤としては、アセトフェノン、３－メチルアセトフェノン等のアセトフェノン系開始剤；ベンゾフェノン、４－クロロベンゾフェノン等のベンゾフェノン系開始剤；ベンゾインプロピルエーテル、ベンゾインエチルエーテル等のベンゾインエーテル系開始剤；４－イソプロピルチオキサントン等のチオキサントン系開始剤等を挙げることができる。活性エネルギー線硬化型接着剤組成物は２種以上の光ラジカル重合開始剤を使用してもよい。 The radical polymerization initiator is preferably a photoradical polymerization initiator. The photoradical polymerization initiator initiates the polymerization reaction of a radically polymerizable compound by irradiation with active energy rays. Examples of the photoradical polymerization initiator include acetophenone-based initiators such as acetophenone and 3-methylacetophenone; benzophenone-based initiators such as benzophenone and 4-chlorobenzophenone; benzoin ether-based initiators such as benzoin propyl ether and benzoin ethyl ether; 4 -A thioxanthone-based initiator such as isopropylthioxanthone can be mentioned. Two or more kinds of photoradical polymerization initiators may be used in the active energy ray-curable adhesive composition.
　活性エネルギー線硬化型組成物は、必要に応じて、各種の添加材を含んでいてもよい。添加剤としては、増感剤、イオントラップ剤、酸化防止剤、連鎖移動剤、粘着付与剤、熱可塑性樹脂、充填剤、流動調整剤、可塑剤、消泡剤等が挙げられる。 The active energy ray-curable composition may contain various additives, if necessary. Examples of the additive include a sensitizer, an ion trapping agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow conditioner, a plasticizer, an antifoaming agent and the like.
　第１硬化物層２は、例えば、活性エネルギー線硬化型接着剤組成物を偏光フィルム１又は第１樹脂フィルム３の上に塗布し、活性エネルギー線を照射することにより塗布した活性エネルギー線硬化型接着剤組成物を硬化させることで得ることができる。
　活性エネルギー線硬化型接着剤組成物の塗工には、ドクターブレード、ワイヤーバー、ダイコーター、カンマコーター、グラビアコーター等の公知の塗工方式が利用できる。 The first cured product layer 2 is, for example, an active energy ray-curable adhesive composition coated on a polarizing film 1 or a first resin film 3 and irradiated with active energy rays. It can be obtained by curing the adhesive composition.
A known coating method such as a doctor blade, a wire bar, a die coater, a comma coater, and a gravure coater can be used for coating the active energy ray-curable adhesive composition.
　活性エネルギー線硬化型接着剤組成物を硬化させる際の光源は、波長４００ｎｍ以下に発光分布を有する光源であることが好ましく、低圧水銀灯、中圧水銀灯、高圧水銀灯、超高圧水銀灯、ケミカルランプ、ブラックライトランプ、マイクロウェーブ励起水銀灯、メタルハライドランプなどを挙げることができる。
　活性エネルギー線硬化型接着剤組成物を硬化させる際の光照射強度は、活性エネルギー線硬化型接着剤組成物によって適宜設定できるが、重合開始剤の活性化に有効な波長領域の光照射強度が０．１～１０００ｍＷ／ｃｍ２であることが好ましい。活性エネルギー線硬化型接着剤組成物の硬化の際の光照射強度が小さすぎると、反応が十分に進行するまでに要する時間が長くなり、逆に光照射強度が大きすぎると、ランプから輻射される熱及び活性エネルギー線硬化型接着剤組成物の重合時の発熱によって、貼着されるフィルムの劣化を生じる可能性がある。活性エネルギー線硬化型接着剤組成物の硬化の際の光照射時間は、特に限定されないが、光照射強度と光照射時間の積として表される積算光量が１０～５０００ｍＪ／ｃｍ２となるように設定することが好ましい。積算光量が小さすぎると、重合開始剤由来の活性種の発生が十分でなく、得られる硬化が不十分になる可能性がある。また、積算光量が大きすぎると、照射時間が非常に長くなり、生産性向上には不利なものとなる。 The light source for curing the active energy ray-curable adhesive composition is preferably a light source having a light emission distribution having a wavelength of 400 nm or less, and is a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a chemical lamp, or black. Examples include light lamps, microwave-excited mercury lamps, and metal halide lamps.
The light irradiation intensity when curing the active energy ray-curable adhesive composition can be appropriately set depending on the active energy ray-curable adhesive composition, but the light irradiation intensity in the wavelength range effective for activating the polymerization initiator is high. It is preferably 0.1 to 1000 mW / cm 2. If the light irradiation intensity at the time of curing the active energy ray-curable adhesive composition is too small, the time required for the reaction to proceed sufficiently becomes long, and conversely, if the light irradiation intensity is too large, radiation is emitted from the lamp. The heat generated during the polymerization of the active energy ray-curable adhesive composition may cause deterioration of the film to be adhered. The light irradiation time at the time of curing the active energy ray-curable adhesive composition is not particularly limited, but the integrated light amount expressed as the product of the light irradiation intensity and the light irradiation time is 10 to 5000 mJ / cm 2. It is preferable to set it. If the integrated light intensity is too small, the generation of active species derived from the polymerization initiator may not be sufficient, and the resulting curing may be insufficient. Further, if the integrated light amount is too large, the irradiation time becomes very long, which is disadvantageous for improving productivity.
　第１硬化物層２の平均屈折率は、光学特性の観点から、１．５９以下であることが好ましく、１．５５以下であることがより好ましく、１．５４以下であることがさらに好ましく、１．５１以下であることが特に好ましい。また、１．４９以上であることが好ましく、１．５０以上であることがより好ましい。
　第１硬化物層２の平均屈折率は、活性エネルギー線硬化型接着剤組成物が有する重合性化合物の種類、それらの含有量等を適宜選択することにより調整することが可能である。例えば、活性エネルギー線硬化型接着剤組成物が光カチオン重合性硬化型接着剤組成物である場合、脂環式エポキシ化合物又は芳香族エポキシ化合物等の化合物自体の屈折率が高いものを含むことで、第１硬化物層２の平均屈折率は高くなる傾向にある。
　第１硬化物層２を形成する活性エネルギー線硬化型接着剤組成物としては、光カチオン重合性硬化型接着剤組成物又は光ラジカル重合性硬化型接着剤組成物であることが好ましい。 The average refractive index of the first cured product layer 2 is preferably 1.59 or less, more preferably 1.55 or less, still more preferably 1.54 or less, from the viewpoint of optical characteristics. It is particularly preferably 1.51 or less. Further, it is preferably 1.49 or more, and more preferably 1.50 or more.
The average refractive index of the first cured product layer 2 can be adjusted by appropriately selecting the types of polymerizable compounds contained in the active energy ray-curable adhesive composition, their contents, and the like. For example, when the active energy ray-curable adhesive composition is a photocationically polymerizable curable adhesive composition, it may contain a compound having a high refractive index such as an alicyclic epoxy compound or an aromatic epoxy compound. , The average refractive index of the first cured product layer 2 tends to be high.
The active energy ray-curable adhesive composition forming the first cured product layer 2 is preferably a photocationic polymerizable curable adhesive composition or a photoradical polymerizable curable adhesive composition.
　第１硬化物層２の厚みは、特に制限はないが、０．１μｍ以上であることが好ましく、０．５μｍ以上であることがより好ましく、１μｍ以上であることさらに好ましく、２．１μｍ以上であることが特に好ましい。また、２０μｍ以下が好ましく、１０μｍ以下であることがより好ましく、５μｍ以下であることがさらに好ましい。 The thickness of the first cured product layer 2 is not particularly limited, but is preferably 0.1 μm or more, more preferably 0.5 μm or more, further preferably 1 μm or more, and 2.1 μm or more. It is particularly preferable to have. Further, it is preferably 20 μm or less, more preferably 10 μm or less, and further preferably 5 μm or less.
＜第１樹脂フィルム＞
　第１樹脂フィルム３は、少なくとも熱可塑性樹脂から形成されたフィルムを含む。第１樹脂フィルム３は、１つの層から形成されていてもよいし、２つ以上の層から形成されていてもよい。第１樹脂フィルム３は、例えば、熱可塑性樹脂から形成された樹脂フィルム単独であってもよいし、熱可塑性樹脂から形成された樹脂フィルムが複数積層された積層フィルムであってもよいし、熱可塑性樹脂から形成された樹脂フィルムの少なくとも一方の面に樹脂硬化層が形成されたフィルムであってもよい。
　第１樹脂フィルム３が複数の層から形成されている場合、第１樹脂フィルムにおける複数の層のうち第１硬化物層と直接接している層の平均屈折率と、第１硬化物層の平均屈折率との差が０．０３以下であればよい。例えば、第１樹脂フィルム３が樹脂硬化層と熱可塑性樹脂から形成された樹脂フィルムとの２層からなるフィルムである場合、第１硬化物層と直接接する層が樹脂硬化層であるのならば樹脂硬化層と第１硬化物層との屈折率差が０．０３以下であればよく、第１硬化物層と熱可塑性樹脂から形成された樹脂フィルムとが直接接するのであれば熱可塑性樹脂から形成された層と第１硬化物層との屈折率差が、０．０３以下となればよい。 <1st resin film>
The first resin film 3 includes at least a film formed of a thermoplastic resin. The first resin film 3 may be formed from one layer or may be formed from two or more layers. The first resin film 3 may be, for example, a resin film formed of a thermoplastic resin alone, a laminated film in which a plurality of resin films formed of a thermoplastic resin are laminated, or heat. A film in which a resin cured layer is formed on at least one surface of a resin film formed of a plastic resin may be used.
When the first resin film 3 is formed of a plurality of layers, the average refractive index of the layer in direct contact with the first cured product layer among the plurality of layers in the first resin film and the average of the first cured product layer. The difference from the refractive index may be 0.03 or less. For example, when the first resin film 3 is a film composed of two layers of a resin cured layer and a resin film formed of a thermoplastic resin, if the layer in direct contact with the first cured product layer is the resin cured layer. The difference in refractive index between the cured resin layer and the first cured product layer may be 0.03 or less, and if the first cured product layer and the resin film formed from the thermoplastic resin are in direct contact with each other, the thermoplastic resin is used. The difference in refractive index between the formed layer and the first cured product layer may be 0.03 or less.
　熱可塑性樹脂樹脂から形成されたフィルムは、具体的には、ポリエチレン、ポリプロピレン、ポリメチルペンテン等のポリオレフィン系樹脂；シクロオレフィン又はノルボルネン構造を有する環状ポリオレフィン系樹脂：ポリフッ化ビニル、ポリフッ化ビニリデン、ポリフッ化エチレン等のフッ素化ポリオレフィン系樹脂；ポリエチレンナフタート、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンテレフタレート／イソフタレート共重合体等のポリエステル系樹脂；ナイロン６、ナイロン６，６等のポリアミド；ポリ塩化ビニル、塩化ビニル－酢酸ビニル共重合体、エチレン－酢酸ビニル共重合体、エチレン－ビニルアルコール共重合体、ポリビニルアルコール、ビニロンのようなビニル重合体；トリアセチルセルロース、ジアセチルセルロース、セロハンのようなセルロース系樹脂；ポリメタクリル酸メチル、ポリメタクリル酸エチル、ポリアクリル酸エチル、ポリアクリル酸ブチル等の（メタ）アクリル系樹脂；その他、ポリスチレン、ポリカーボネート、ポリアリレート、ポリイミドなどから構成される樹脂フィルムが挙げられる。 Specifically, the film formed from the thermoplastic resin resin is a polyolefin resin such as polyethylene, polypropylene, or polymethylpentene; a cyclic polyolefin resin having a cycloolefin or norbornene structure: polyvinyl acetate, vinylidene fluoride, polyfluoride, or the like. Fluorinated polyolefin resins such as ethylene oxide; polyester resins such as polyethylene naphthate, polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate / isophthalate copolymer; polyamides such as nylon 6, nylon 6, 6; polyvinyl chloride, Vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, vinyl polymers such as vinylon; cellulose-based resins such as triacetyl cellulose, diacetyl cellulose, cellophane (Meta) acrylic resins such as polymethyl methacrylate, ethyl polymethacrylate, ethyl polyacrylate, butyl polyacrylate; In addition, resin films composed of polystyrene, polycarbonate, polyarylate, polyimide and the like can be mentioned.
　熱可塑性樹脂から形成された樹脂フィルムは、上記樹脂と添加剤とを含有する組成物から形成されたフィルムであってもよい。前記添加剤としては、紫外線吸収剤、酸化防止剤、界面活性剤、可塑剤、滑剤、アンチブロッキング剤等が挙げられる。 The resin film formed from the thermoplastic resin may be a film formed from a composition containing the above resin and additives. Examples of the additive include an ultraviolet absorber, an antioxidant, a surfactant, a plasticizer, a lubricant, an antiblocking agent and the like.
　熱可塑性樹脂から形成された樹脂フィルムの平均屈折率は、樹脂の種類、樹脂の重合度等で調整することができる。また、樹脂に添加剤を配合することで調整してもよい。 The average refractive index of the resin film formed from the thermoplastic resin can be adjusted by the type of resin, the degree of polymerization of the resin, and the like. Further, it may be adjusted by adding an additive to the resin.
　熱可塑性樹脂から形成される樹脂フィルムは、セルロース系樹脂フィルム、（メタ）アクリル系樹脂フィルム又はシクロオレフィン系樹脂フィルムであることが好ましく、シクロオレフィン系樹脂フィルムであることがより好ましい。 The resin film formed from the thermoplastic resin is preferably a cellulose-based resin film, a (meth) acrylic-based resin film, or a cycloolefin-based resin film, and more preferably a cycloolefin-based resin film.
　第１樹脂フィルム３が樹脂硬化層を含む場合、樹脂硬化層は、平均屈折率差が所定の範囲となれば、特に制限はないが、通常、樹脂組成物から形成される層であり、樹脂組成物の硬化物層である。具体的には、水系樹脂組成物から形成される層、活性エネルギー線硬化型組成物から形成された層等が挙げられる。 When the first resin film 3 contains a resin-cured layer, the resin-cured layer is not particularly limited as long as the average refractive index difference is within a predetermined range, but is usually a layer formed from a resin composition and is a resin. It is a cured product layer of the composition. Specific examples thereof include a layer formed from an aqueous resin composition, a layer formed from an active energy ray-curable composition, and the like.
　水系樹脂組成物は、特に制限はないが、少なくとも樹脂成分を含み、樹脂成分が水に溶解または分散したものである。水系樹脂組成物を形成する樹脂としては、例えば、ポリビニルアルコール系樹脂、ポリウレタン系樹脂、ポリエステル系樹脂、オキサゾリン基等の架橋性官能基を有するアクリル樹脂などが挙げられる。熱可塑性樹脂から形成されたフィルムがシクロオレフィン系樹脂フィルムの場合、フィルムへの密着性の観点から、樹脂硬化層はポリウレタン系樹脂から形成されることが好ましい。 The water-based resin composition is not particularly limited, but contains at least a resin component, and the resin component is dissolved or dispersed in water. Examples of the resin forming the aqueous resin composition include polyvinyl alcohol-based resins, polyurethane-based resins, polyester-based resins, acrylic resins having crosslinkable functional groups such as oxazoline groups, and the like. When the film formed from the thermoplastic resin is a cycloolefin-based resin film, the resin cured layer is preferably formed from a polyurethane-based resin from the viewpoint of adhesion to the film.
　ポリウレタン系樹脂は、代表的には、ポリオールとポリイソシアネートの反応生成物である。ポリオール成分としては、（メタ）アクリル酸エステルと水酸基含有モノマーとの重合により得られるポリアクリルポリオール、多塩基酸とポリオールとの反応により得られるポリエステルポリオール、多塩基酸とポリオールとの反応により得られるポリエーテルポリオール等の高分子ポリオールが好ましく用いられる。 Polyurethane-based resin is typically a reaction product of polyol and polyisocyanate. As the polyol component, a polyacrylic polyol obtained by polymerization of a (meth) acrylic acid ester and a hydroxyl group-containing monomer, a polyester polyol obtained by a reaction of a polybasic acid and a polyol, and a reaction of a polybasic acid and a polyol are obtained. High molecular weight polyols such as polyether polyols are preferably used.
　また、ポリウレタン系樹脂は、酸構造を有していてもよい。酸構造としては、例えば、カルボキシル基（－ＣＯＯＨ）、スルホン酸基（－ＳＯ３Ｈ）等の酸基などを挙げることができる。また、酸構造は、ポリウレタン系樹脂において側鎖に存在していてもよく、末端に存在していてもよい。なお、酸構造は、１種類を用いてもよく、２種類以上を任意の比率で組み合わせて用いてもよい。酸構造の含有量としては、ポリウレタン中の酸価として、１０ｍｇＫＯＨ／ｇ～２５０ｍｇＫＯＨ／ｇ以下であることが好ましい。 Further, the polyurethane resin may have an acid structure. Examples of the acid structure include acid groups such as a carboxyl group (-COOH) and a sulfonic acid group (-SO3H). Further, the acid structure may be present in the side chain or the terminal of the polyurethane resin. As the acid structure, one type may be used, or two or more types may be used in combination at an arbitrary ratio. The content of the acid structure is preferably 10 mgKOH / g to 250 mgKOH / g or less as the acid value in the polyurethane.
　ポリウレタン系樹脂は、市販されているものを用いてもよい、市販品としては、例えば、ＡＤＥＫＡ社製の「アデカボンタイター」シリーズ、三井化学社製の「オレスター」シリーズ、大日本インキ化学工業社製の「ボンディック」シリーズ、「ハイドラン」シリーズ、バイエル社製の「インプラニール」シリーズ、花王社製の「ポイズ」シリーズ、三洋化成工業社製の「サンプレン」シリーズ、保土谷化学工業社製の「アイゼラックス」シリーズ、第一工業製薬社製の「スーパーフレックス」シリーズ、ゼネカ社製の「ネオレッツ」シリーズ、ルブリゾール社性の「Ｓａｎｃｕｒｅ」シリーズなどを用いることができる。
　なお、ポリウレタンは、１種類を単独で用いてもよく、２種類以上を任意の比率で組み合わせて用いてもよい。 As the polyurethane resin, commercially available ones may be used. Examples of commercially available products include "ADEKA Bontiter" series manufactured by ADEKA, "Orestar" series manufactured by Mitsui Chemicals, and Dainippon Ink and Chemicals Co., Ltd. "Bondic" series, "Hydran" series, Bayer "Implanil" series, Kao "Poise" series, Sanyo Kasei Kogyo "Samplen" series, Hodoya Chemical Industry Co., Ltd. "Izelax" series, "Superflex" series manufactured by Daiichi Kogyo Seiyaku Co., Ltd., "Neolets" series manufactured by Zeneka Corporation, "Sancure" series manufactured by Lubrizol, etc. can be used.
As for polyurethane, one type may be used alone, or two or more types may be used in combination at an arbitrary ratio.
　水系樹脂組成物は、架橋剤を含んでいてもよい。架橋剤としては、ポリウレタン樹脂の架橋性官能基と反応可能なものを特に制限なく使用できる。ポリウレタン樹脂がカルボキシ基を有する場合は、アミノ基、オキサゾリン基、エポキシ基、カルボジイミド基等を含む架橋剤が用いられる。 The water-based resin composition may contain a cross-linking agent. As the cross-linking agent, one capable of reacting with the cross-linking functional group of the polyurethane resin can be used without particular limitation. When the polyurethane resin has a carboxy group, a cross-linking agent containing an amino group, an oxazoline group, an epoxy group, a carbodiimide group and the like is used.
　水系樹脂組成物は、塩基成分を含んでいてもよい。塩基成分としては、水酸化ナトリウムや水酸化カリウムなどの無機塩基；１級アミン化合物、２級アミン化合物、３級アミン化合物、ヒドラジド化合物、イミダゾリン化合物、等が挙げられる。なかでも、ヒドラジド化合物のようにヒドラジノ基（－ＮＨＮＨ２基）を有する化合物は、ポリウレタン樹脂層の機械的強度を適切に向上させることができるため好ましい。ヒドラジド化合物としては、例えば、カルボジヒドラジド、シュウ酸ジヒドラジド、イソフタル酸ジヒドラジド、テレフタル酸ジヒドラジド、グリコリック酸ジヒドラジド、ポリアクリル酸ジヒドラジド等が挙げられる。 The water-based resin composition may contain a base component. Examples of the base component include inorganic bases such as sodium hydroxide and potassium hydroxide; primary amine compounds, secondary amine compounds, tertiary amine compounds, hydrazide compounds, imidazoline compounds, and the like. Among them, a compound having a hydrazino group (-NHNH2 group) such as a hydrazide compound is preferable because it can appropriately improve the mechanical strength of the polyurethane resin layer. Examples of the hydrazide compound include carbodihydrazide, oxalic acid dihydrazide, isophthalic acid dihydrazide, terephthalic acid dihydrazide, glycolic acid dihydrazide, polyacrylic acid dihydrazide and the like.
　樹脂硬化層は、上記樹脂と添加剤とを含有する組成物から形成されたフィルムであってもよい。前記添加剤としては、紫外線吸収剤、酸化防止剤、界面活性剤、可塑剤、滑剤、アンチブロッキング、無機粒子剤、有機微粒子等が挙げられる。 The resin cured layer may be a film formed from a composition containing the above resin and additives. Examples of the additive include an ultraviolet absorber, an antioxidant, a surfactant, a plasticizer, a lubricant, an antiblocking agent, an inorganic particle agent, and organic fine particles.
　硬化樹脂層の平均屈折率は、樹脂の種類、樹脂の重合度、架橋剤の種類等で調整することができる。また、樹脂に添加剤を配合することで調整してもよい。
　樹脂硬化層の厚みは、通常、０．０１～５μｍであり、好ましくは０．０３～２μｍ、より好ましくは０．０５～０．５μｍであることが好ましい。 The average refractive index of the cured resin layer can be adjusted by adjusting the type of resin, the degree of polymerization of the resin, the type of cross-linking agent, and the like. Further, it may be adjusted by adding an additive to the resin.
The thickness of the cured resin layer is usually 0.01 to 5 μm, preferably 0.03 to 2 μm, and more preferably 0.05 to 0.5 μm.
　第１樹脂フィルム３は、位相差値を有していてもよいし、位相差値を有していなくてもよい。また、第１樹脂フィルム３は、面内に位相差を有していてもよいし、厚み方向に位相差を有していてもよい。面内レタデーションＲｅ及び厚み方向のレタデーションＲｔｈ
は下式（１）及び（２）で定義される。
　　　Ｒth＝〔(ｎx＋ｎy)／２－ｎz〕×ｄ 　　　（１）
　　　Ｒe ＝（ｎx－ｎy）×ｄ　　　　　　　　　（２）
（式中、ｎxは波長５８６ｎｍにおけるフィルム面内の遅相軸方向（ｘ軸方向）の屈折率であり、ｎyは波長５８６ｎｍにおけるフィルム面内の進相軸方向（面内でｘ軸に直交するｙ軸方向）の屈折率であり、ｎzは波長５８６ｎｍにおけるフィルムの厚み方向（フィルム面に垂直なｚ軸方向）の屈折率であり、そしてｄはフィルムの厚みである。） The first resin film 3 may or may not have a retardation value. Further, the first resin film 3 may have a phase difference in the plane or may have a phase difference in the thickness direction. Retardation R th in-plane retardation R e and the thickness direction
Is defined by the following equations (1) and (2).
R th = [(n x + n y ) / 2-n z ] × d (1)
R e = (n x -n y ) × d (2)
(In the equation, n x is the refractive index in the slow axial direction (x-axis direction) in the film plane at a wavelength of 586 nm, and n y is the phase-advancing axial direction in the film plane at a wavelength of 586 nm (in the x-axis in the plane). The refractive index in the orthogonal y-axis direction), n z is the refractive index in the film thickness direction (z-axis direction perpendicular to the film surface) at a wavelength of 586 nm, and d is the film thickness.)
　第１樹脂フィルム３（２層以上含む場合は第１硬化物層と直接接する層）の平均屈折率は、光学特性の観点から、１．４４～１．５７であることが好ましく、１．４５～１．５５であることがより好ましく、１．４８～１．５４であることがさらに好ましく、１．５２～１．５３であることが特に好ましい。 The average refractive index of the first resin film 3 (a layer that is in direct contact with the first cured product layer when two or more layers are contained) is preferably 1.44 to 1.57, preferably 1.45. It is more preferably ~ 1.55, further preferably 1.48 to 1.54, and particularly preferably 1.52 to 1.53.
　第１樹脂フィルム３の厚みは、偏光フィルムに積層させる際における取り扱いの容易さから、好ましくは６μｍ以上、より好ましくは１２μｍ以上、さらに好ましくは２０μｍ以上、特に好ましくは４０μｍ以上であり、好ましくは２００μｍ以下、より好ましくは１８０μｍ以下、さらに好ましくは１５０μｍ以下、特に好ましくは１００μｍ以下である。第１樹脂フィルム３が複数層から形成される場合は、その合計が上記範囲であればよい。 The thickness of the first resin film 3 is preferably 6 μm or more, more preferably 12 μm or more, still more preferably 20 μm or more, particularly preferably 40 μm or more, and preferably 200 μm, from the viewpoint of ease of handling when laminated on the polarizing film. Hereinafter, it is more preferably 180 μm or less, further preferably 150 μm or less, and particularly preferably 100 μm or less. When the first resin film 3 is formed from a plurality of layers, the total may be within the above range.
＜偏光フィルム＞
　偏光フィルム１は、入射する自然光から直線偏光を取り出す機能を有するフィルムである。偏光フィルム１としては、ポリビニルアルコール系樹脂フィルムに二色性色素（好ましくはヨウ素）を含有させ、吸着配向させたフィルムが挙げられる。ポリビニルアルコール系樹脂フィルムに二色性色素を吸着配向させたフィルムは、公知の方法で製造することができ、通常、ポリビニルアルコール系樹脂フィルムを一軸延伸する工程、ポリビニルアルコール系樹脂フィルムを二色性色素で染色することによりその二色性色素を吸着させる工程、及び二色性色素が吸着されたポリビニルアルコール系樹脂フィルムをホウ酸水溶液で処理する工程を経て製造される。また、例えば、特開２０１２－１５９７７８号公報に記載の方法でもポリビニルアルコール系樹脂フィルムに二色性色素を吸着配向させたフィルムを得ることができる。 <Polarizing film>
The polarizing film 1 is a film having a function of extracting linearly polarized light from incident natural light. Examples of the polarizing film 1 include a polyvinyl alcohol-based resin film containing a dichroic dye (preferably iodine) and adsorbed and oriented. A film in which a bicolor dye is adsorbed and oriented on a polyvinyl alcohol-based resin film can be produced by a known method, and is usually a step of uniaxially stretching the polyvinyl alcohol-based resin film, or bicoloring the polyvinyl alcohol-based resin film. It is produced through a step of adsorbing the bicolor dye by dyeing with a dye and a step of treating a polyvinyl alcohol-based resin film on which the bicolor dye is adsorbed with an aqueous boric acid solution. Further, for example, a film in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol-based resin film can also be obtained by the method described in JP2012-159778.
　偏光フィルム１の厚みは、３～３０μｍであることが好ましく、１０～２５μｍであることがより好ましい。 The thickness of the polarizing film 1 is preferably 3 to 30 μm, more preferably 10 to 25 μm.
　偏光フィルム１の平均屈折率の値は、第１硬化物層２の平均屈折率と同じか第１硬化物層２の平均屈折率の値よりも大きい方が好ましい。
　偏光フィルム１の平均屈折率の値は、第１樹脂フィルム３の平均屈折率の値よりも大きい方が好ましい。 The value of the average refractive index of the polarizing film 1 is preferably the same as the average refractive index of the first cured product layer 2 or larger than the value of the average refractive index of the first cured product layer 2.
The value of the average refractive index of the polarizing film 1 is preferably larger than the value of the average refractive index of the first resin film 3.
＜第２硬化物層＞
　本発明の粘着剤層付き偏光板は、偏光フィルム１の第１硬化物層２とは反対側の面に第２硬化物層４を備えていてもよい。第２硬化物層４と偏光フィルム１との間にはその他の層があってもよいが、第２硬化物層４と偏光フィルム１とは直接接していることが好ましい。
　第２硬化物層４は、通常、樹脂組成物から形成される層であり、樹脂組成物の硬化物層である。具体的には、粘着剤組成物から形成される層（粘着剤層）、水系接着剤組成物から形成される層、活性エネルギー線硬化性組成物から形成された層等が挙げられる。
　第２硬化物層４を形成する樹脂組成物は、第１硬化物層２を形成する樹脂組成物と同じものであってもよいし、異なるものであってもよい。
　第２硬化物層４は、活性エネルギー線硬化性組成物から形成される層であることが好ましい。 <Second cured product layer>
The polarizing plate with an adhesive layer of the present invention may include a second cured product layer 4 on a surface of the polarizing film 1 opposite to the first cured product layer 2. There may be other layers between the second cured product layer 4 and the polarizing film 1, but it is preferable that the second cured product layer 4 and the polarizing film 1 are in direct contact with each other.
The second cured product layer 4 is usually a layer formed from the resin composition, and is a cured product layer of the resin composition. Specific examples thereof include a layer formed from an adhesive composition (adhesive layer), a layer formed from an aqueous adhesive composition, a layer formed from an active energy ray-curable composition, and the like.
The resin composition forming the second cured product layer 4 may be the same as or different from the resin composition forming the first cured product layer 2.
The second cured product layer 4 is preferably a layer formed from the active energy ray-curable composition.
＜第２樹脂フィルム＞
　第２樹脂フィルム５は、透明性、機械的強度、熱安定性、水分遮蔽性、等方性等に優れるフィルムであることが好ましい。例えば、ポリエチレンテレフタレートやポリエチレンナフタレート等のポリエステル系ポリマー；ジアセチルセルロースやトリアセチルセルロース等のセルロース系ポリマー；ポリメチルメタクリレート等のアクリル系ポリマー；ポリスチレンやアクリロニトリル・スチレン共重合体（ＡＳ樹脂）等のスチレン系ポリマー；ポリカーボネート系ポリマーがあげられる。また、ポリエチレン、ポリプロピレン、シクロ系又はノルボルネン構造を有するポリオレフィン；エチレン・プロピレン共重合体のようなポリオレフィン系ポリマー；塩化ビニル系ポリマー、ナイロンや芳香族ポリアミド等のアミド系ポリマー；イミド系ポリマー、スルホン系ポリマー、ポリエーテルスルホン系ポリマー、ポリエーテルエーテルケトン系ポリマー、ポリフェニレンスルフィド系ポリマー、ビニルアルコール系ポリマー、塩化ビニリデン系ポリマー、ビニルブチラール系ポリマー、アリレート系ポリマー、ポリオキシメチレン系ポリマー、エポキシ系ポリマー、又は前記ポリマーのブレンド物等が挙げられる。
　第２樹脂フィルム５と第１樹脂フィルム３とは同じ樹脂フィルムであってもよいし、異なる樹脂フィルムであってもよい。 <Second resin film>
The second resin film 5 is preferably a film having excellent transparency, mechanical strength, thermal stability, moisture shielding property, isotropic property, and the like. For example, polyester polymers such as polyethylene terephthalate and polyethylene naphthalate; cellulose polymers such as diacetyl cellulose and triacetyl cellulose; acrylic polymers such as polymethyl methacrylate; styrene such as polystyrene and acrylonitrile-styrene copolymer (AS resin). Based polymer; Polystyrene based polymer can be mentioned. Further, a polyolefin having a polyethylene, polypropylene, cyclo-based or norbornene structure; a polyolefin-based polymer such as an ethylene-propylene copolymer; a vinyl chloride-based polymer, an amide-based polymer such as nylon or aromatic polyamide; an imide-based polymer, a sulfone-based polymer. Polymers, polyether sulfone-based polymers, polyether ether ketone-based polymers, polyphenylene sulfide-based polymers, vinyl alcohol-based polymers, vinylidene chloride-based polymers, vinyl butyral-based polymers, allylate-based polymers, polyoxymethylene-based polymers, epoxy-based polymers, or Examples thereof include blends of the polymers.
The second resin film 5 and the first resin film 3 may be the same resin film or may be different resin films.
　第２樹脂フィルム５は透湿度が低いフィルムであることが好ましい。第２樹脂フィルム５の透湿度は、温度４０℃、相対湿度９０％において、好ましくは８００ｇ／（ｍ２・２４時間）以下であり、より好ましくは６００ｇ／（ｍ２・２４時間）以下、さらに好ましくは４００ｇ／（ｍ２・２４時間）以下、特に好ましくは２００ｇ／（ｍ２・２４時間）以下であり、特に好ましくは１００ｇ／（ｍ２・２４時間）以下である。第２樹脂フィルム５の透湿度が上記値以下であると、高温高湿下において外部からの水分の浸入を防ぎ、偏光フィルム１に含まれる二色性色素（ヨウ素）の移動が加速されるのを防ぐことができるため、光学特性の劣化をより効果的に防止することができる。 The second resin film 5 is preferably a film having low moisture permeability. Moisture permeability of the second resin film 5, a temperature 40 ° C., at a relative humidity of 90%, preferably 800g / (m 2 · 24 hr) or less, more preferably 600g / (m 2 · 24 hr) or less, further preferably 400g / (m 2 · 24 hr) or less, particularly preferably 200g / (m 2 · 24 hr) or less, particularly preferably 100g / (m 2 · 24 hours) or less. When the moisture permeability of the second resin film 5 is not more than the above value, the infiltration of moisture from the outside is prevented under high temperature and high humidity, and the movement of the dichroic dye (iodine) contained in the polarizing film 1 is accelerated. Therefore, deterioration of optical characteristics can be prevented more effectively.
　第２樹脂フィルム５の厚みは、特に制限されないが、通常５～５００μｍであり、好ましくは１～３００μｍ、より好ましくは５～２００μｍ、さらに好ましくは１０～１００μｍである。 The thickness of the second resin film 5 is not particularly limited, but is usually 5 to 500 μm, preferably 1 to 300 μm, more preferably 5 to 200 μm, and even more preferably 10 to 100 μm.
＜粘着剤層＞　
　粘着剤層６は、公知の粘着剤組成物から形成される層であってもよい。粘着剤組成物としては、例えば、アクリル系樹脂、ゴム系樹脂、ウレタン系樹脂、シリコーン系樹脂、ポリビニルエーテル系樹脂などをベースポリマーとして有する粘着剤組成物を挙げられる。
　また、粘着剤組成物は、エネルギー線硬化型粘着剤組成物、熱硬化型粘着剤組成物であってもよい。
　粘着剤層６を形成する粘着剤組成物は、透明性、粘着力、リワーク性、耐候性、耐熱性などに優れるアクリル系樹脂をベースポリマーとしたアクリル系粘着剤組成物であることが好ましい。 <Adhesive layer>
The pressure-sensitive adhesive layer 6 may be a layer formed from a known pressure-sensitive adhesive composition. Examples of the pressure-sensitive adhesive composition include a pressure-sensitive adhesive composition containing an acrylic resin, a rubber-based resin, a urethane-based resin, a silicone-based resin, a polyvinyl ether-based resin, or the like as a base polymer.
Further, the pressure-sensitive adhesive composition may be an energy ray-curable pressure-sensitive adhesive composition or a thermosetting type pressure-sensitive adhesive composition.
The pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer 6 is preferably an acrylic pressure-sensitive adhesive composition using an acrylic resin having excellent transparency, adhesive strength, reworkability, weather resistance, heat resistance, and the like as a base polymer.
　粘着層６は、粘着剤組成物を有機溶剤溶液とし、第１樹脂フィルム４にダイコータやグラビアコータなどによって塗布し、乾燥させる方法によって設けることができる。また、離型処理が施されたプラスチックフィルム（セパレートフィルムと呼ばれる）上に形成されたシート状粘着剤組成物を、第１樹脂フィルム４に転写する方法によっても設けることができる。 The pressure-sensitive adhesive layer 6 can be provided by a method in which the pressure-sensitive adhesive composition is used as an organic solvent solution, applied to the first resin film 4 with a die coater, a gravure coater, or the like, and dried. Further, the sheet-like pressure-sensitive adhesive composition formed on the plastic film (called a separate film) that has been subjected to the mold release treatment can also be provided by a method of transferring to the first resin film 4.
　粘着剤層６の厚みは、特に制限はないが、２～４０μｍの範囲内であることが好ましく、５～３５μｍの範囲内であることがより好ましく、１０～３０μｍの範囲内であることがさらに好ましい。 The thickness of the pressure-sensitive adhesive layer 6 is not particularly limited, but is preferably in the range of 2 to 40 μm, more preferably in the range of 5 to 35 μm, and further preferably in the range of 10 to 30 μm. preferable.
　粘着剤層６は、その貯蔵弾性率が２３～８０℃において０．１０～５．０ＭＰａであることが好ましく、０．１５～１．０ＭＰａであることがより好ましい。２３～８０℃における貯蔵弾性率が０．１０ＭＰａ以上であると、粘着剤層付き偏光板を含む液晶表示パネルが高温などにさられた際の粘着剤層付き偏光板の収縮による白ヌケを抑制できるため好ましい。また、５ＭＰａ以下であると粘着力の低下による耐久性の低下が起こりにくいため好ましい。ここで、「２３～８０℃において０．１０～５．０ＭＰａの貯蔵弾性率を示す」とは、この範囲のいずれの温度においても、貯蔵弾性率が上記範囲の値をとることを意味する。貯蔵弾性率は通常、温度上昇に伴って漸減するので、２３℃及び８０℃における貯蔵弾性率がいずれも上記範囲に入っていれば、この範囲の温度において、粘着層が上記範囲の貯蔵弾性率を示すとみることができる。なお、粘着層の貯蔵弾性率は、市販の粘弾性測定装置、例えば、ＲＥＯＭＥＴＲＩＣ社製の粘弾性測定装置「ＤＹＮＡＭＩＣ　ＡＮＡＬＹＺＥＲ　ＲＤＡ　ＩＩ」により測定することができる。 The storage elastic modulus of the pressure-sensitive adhesive layer 6 is preferably 0.10 to 5.0 MPa, more preferably 0.15 to 1.0 MPa at 23 to 80 ° C. When the storage elastic modulus at 23 to 80 ° C. is 0.10 MPa or more, whitening due to shrinkage of the polarizing plate with the adhesive layer when the liquid crystal display panel containing the polarizing plate with the adhesive layer is exposed to a high temperature or the like is suppressed. It is preferable because it can be done. Further, when it is 5 MPa or less, the durability is less likely to be lowered due to the decrease in the adhesive strength, which is preferable. Here, "showing a storage elastic modulus of 0.10 to 5.0 MPa at 23 to 80 ° C." means that the storage elastic modulus takes a value in the above range at any temperature in this range. Since the storage elastic modulus usually gradually decreases as the temperature rises, if the storage elastic modulus at 23 ° C. and 80 ° C. is both within the above range, the adhesive layer has the storage elastic modulus within the above range at the temperature in this range. Can be seen as showing. The storage elastic modulus of the adhesive layer can be measured by a commercially available viscoelasticity measuring device, for example, a viscoelasticity measuring device "DYNAMIC ANALYZER RDA II" manufactured by REOMETRIC.
　粘着剤層６の平均屈折率は、１．４５～１．４９であることが好ましく、１．４６～１．４７であることがより好ましい。
　粘着剤層６の平均屈折率の値は、第１樹脂フィルム３の平均屈折率の値と同じか、第１樹脂フィルム３の平均屈折率の値より小さいことが好ましい。粘着剤層６の平均屈折率と第１樹脂フィルム３の平均屈折率との差は、０．１２以下であることが好ましく、０．１０以下であることがより好ましく、０．０８以下であることがさらに好ましい。
　粘着剤層６の平均屈折率は、ベースポリマーの種類や架橋剤の種類を変更することで調整することが可能である。 The average refractive index of the pressure-sensitive adhesive layer 6 is preferably 1.45 to 1.49, and more preferably 1.46 to 1.47.
The value of the average refractive index of the pressure-sensitive adhesive layer 6 is preferably the same as the value of the average refractive index of the first resin film 3 or smaller than the value of the average refractive index of the first resin film 3. The difference between the average refractive index of the pressure-sensitive adhesive layer 6 and the average refractive index of the first resin film 3 is preferably 0.12 or less, more preferably 0.10 or less, and 0.08 or less. Is even more preferable.
The average refractive index of the pressure-sensitive adhesive layer 6 can be adjusted by changing the type of the base polymer and the type of the cross-linking agent.
　本発明は、本発明の粘着剤層付き偏光板と画像表示パネルとを積層させた画像表示装置も含む。本発明の粘着剤層付き偏光板は、画像表示パネルの視認側（液晶表示パネルの場合はバックライトの反対側）に積層させることが好ましい。画像表示パネルは、液晶表示パネルであってもよいし、有機ＥＬ表示パネルであってもよい。 The present invention also includes an image display device in which the polarizing plate with an adhesive layer of the present invention and an image display panel are laminated. The polarizing plate with an adhesive layer of the present invention is preferably laminated on the visible side of the image display panel (in the case of a liquid crystal display panel, the opposite side of the backlight). The image display panel may be a liquid crystal display panel or an organic EL display panel.
　以下、実施例により本発明をより詳細に説明するが、本発明はこれらの実施例により何ら限定されるものではない。なお、実施例、比較例中の「％」及び「部」は特に断りのない限り、それぞれ「質量％」及び「質量部」を表す。 Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. Unless otherwise specified, "%" and "parts" in Examples and Comparative Examples represent "mass%" and "parts by mass", respectively.
　＜活性エネルギー線硬化型接着剤の屈折率測定方法＞
　活性エネルギー線硬化型接着剤を、延伸ノルボルネン系樹脂フィルム〔日本ゼオン（株）製 “ゼオノアフィルム”〕の片面に、バーコーター〔第一理化（株）製〕を用いて塗工し、紫外線照射装置〔フュージョンＵＶシステムズ（株）製〕で積算光量６００ｍＪ／ｃｍ2 （ＵＶ－Ｂ）で紫外線を照射し硬化物を得た。得られた硬化物の膜厚は約３０μｍであった。
　得られた硬化物からノルボルネン系樹脂フィルムを剥離し、硬化物層の屈折率（波長５８９ｎｍ）を２５℃環境下で多波長アッベ屈折計〔（株）アタゴ製“ＤＲ－Ｍ２”〕を用いて測定した。
　活性エネルギー線硬化型接着剤ａの硬化物の屈折率は１．５４であり、活性エネルギー線硬化型接着剤ｂの硬化物の屈折率は１．５１であった。 <Method of measuring the refractive index of active energy ray-curable adhesive>
An active energy ray-curable adhesive is applied to one side of a stretched norbornene-based resin film [“Zeonoa film” manufactured by Nippon Zeon Co., Ltd.] using a bar coater [manufactured by Daiichi Rika Co., Ltd.] and irradiated with ultraviolet rays. A cured product was obtained by irradiating ultraviolet rays with an apparatus [manufactured by Fusion UV Systems Co., Ltd.] with an integrated light amount of 600 mJ / cm 2 (UV-B). The film thickness of the obtained cured product was about 30 μm.
The norbornene-based resin film is peeled off from the obtained cured product, and the refractive index (wavelength 589 nm) of the cured product layer is measured in an environment of 25 ° C. using a multi-wavelength Abbe refractometer [“DR-M2” manufactured by Atago Co., Ltd.]. It was measured.
The refractive index of the cured product of the active energy ray-curable adhesive a was 1.54, and the refractive index of the cured product of the active energy ray-curable adhesive b was 1.51.
＜製造例１：偏光フィルムの製造＞
　平均重合度約２，４００、ケン化度９９．９モル％以上で厚さ７５μｍのポリビニルアルコールフィルムを、３０℃の純水に浸漬した後、ヨウ素／ヨウ化カリウム／水の質量比が０．０２／２／１００の水溶液に３０℃で浸漬してヨウ素染色を行った（ヨウ素染色工程）。ヨウ素染色工程を経たポリビニルアルコールフィルムを、ヨウ化カリウム／ホウ酸／水の質量比が１２／５／１００の水溶液に、５６．５℃で浸漬してホウ酸処理を行った（ホウ酸処理工程）。
　ホウ酸処理工程を経たポリビニルアルコールフィルムを８℃の純水で洗浄した後、６５℃で乾燥して、ポリビニルアルコールにヨウ素が吸着配向している偏光子を得た。この際、ヨウ素染色工程とホウ酸処理工程において延伸を行った。かかる延伸におけるトータル延伸倍率は５．３倍で、得られた偏光子の厚みは２７μｍであった。 <Manufacturing example 1: Production of polarizing film>
A polyvinyl alcohol film having an average degree of polymerization of about 2,400, a saponification degree of 99.9 mol% or more and a thickness of 75 μm was immersed in pure water at 30 ° C., and then the mass ratio of iodine / potassium iodide / water was 0. It was immersed in an aqueous solution of 02/2/100 at 30 ° C. for iodine staining (iodine staining step). The polyvinyl alcohol film that had undergone the iodine dyeing step was immersed in an aqueous solution having a mass ratio of potassium iodide / boric acid / water of 12/5/100 at 56.5 ° C. to perform boric acid treatment (boric acid treatment step). ).
The polyvinyl alcohol film that had undergone the boric acid treatment step was washed with pure water at 8 ° C. and then dried at 65 ° C. to obtain a polarizer in which iodine was adsorbed and oriented on the polyvinyl alcohol. At this time, stretching was performed in the iodine dyeing step and the boric acid treatment step. The total draw ratio in such stretching was 5.3 times, and the thickness of the obtained polarizer was 27 μm.
＜作製例１：偏光板の作製＞
　偏光板の作製に用いた樹脂フィルムは以下の通りである。
　フィルムＡ：８０μｍ（メタ）アクリル系樹脂からなるフィルム
　フィルムＢ：５０μｍの平均屈折率が１．５３のシクロオレフィン系樹脂からなるフィルム（面内リタデーションＲｅ＝５０ｎｍ、厚み方向のリタデーションＲｔｈ＝１３５ｎｍ）
　フィルムＣ：シクロオレフィン系樹脂フィルム（フィルムＢ）の一方の面に、厚み５０ｎｍ、平均屈折率が１．５７の樹脂硬化層Ｘが形成されたもの。 <Production example 1: Preparation of polarizing plate>
The resin film used for producing the polarizing plate is as follows.
Film A: Film made of 80 μm (meth) acrylic resin Film B: Film made of cycloolefin resin with an average refractive index of 1.53 at 50 μm (in-plane retardation Re = 50 nm, thickness direction retardation Rth = 135 nm)
Film C: A resin cured layer X having a thickness of 50 nm and an average refractive index of 1.57 is formed on one surface of a cycloolefin resin film (film B).
　フィルムＡの片面にコロナ放電処理を施し、そのコロナ放電処理面に、活性エネルギー線硬化型硬化性組成物ｂを硬化後の厚みが約３．５μｍとなるように塗工した。次いで、その塗工面に製造例１で作製した偏光子を貼合した。次に、フィルムＢの片面にコロナ放電処理を施し、そのコロナ放電処理面に、活性エネルギー線硬化型硬化性組成物ａを硬化後の厚みが約２．５μｍとなるように塗工した。その塗工面に、前記で作製したフィルムＡ付きの偏光子を偏光子側で重ね、貼合ロールを用いて押圧、貼合して積層体を得た。得られた積層体に対して、フィルムＢ側から、ベルトコンベア付の紫外線照射装置〔ランプはフュージョンＵＶシステムズ社製の「Ｄバルブ」使用〕を用いて積算光量が４００ｍＪ／ｃｍ2（ＵＶＢ）となるように紫外線を照射し、両面の接着剤層を硬化させて偏光板を作製した。得られた偏光板の構成は、フィルムＡ（第２樹脂フィルム）／硬化性組成物ｂの硬化物層（第２硬化物層）／偏光フィルム／硬化性組成物ａの硬化物層（第１硬化物層）／フィルムＢ（第１樹脂フィルム）であり、第１の硬化物層と第１の樹脂フィルムの屈折率差の絶対値は０．０１であった。 One side of the film A was subjected to a corona discharge treatment, and the corona discharge treated surface was coated with an active energy ray-curable curable composition b so that the thickness after curing was about 3.5 μm. Next, the polarizer prepared in Production Example 1 was attached to the coated surface. Next, one side of the film B was subjected to a corona discharge treatment, and the corona discharge treated surface was coated with the active energy ray-curable curable composition a so that the thickness after curing was about 2.5 μm. The polarizer with the film A produced above was laminated on the coated surface on the polarizer side, and pressed and bonded using a bonding roll to obtain a laminated body. With respect to the obtained laminate, the integrated light amount was 400 mJ / cm 2 (UVB) from the film B side using an ultraviolet irradiation device with a belt conveyor [the lamp uses a "D valve" manufactured by Fusion UV Systems). A polarizing plate was prepared by irradiating ultraviolet rays so as to be such that the adhesive layers on both sides were cured. The structure of the obtained polarizing plate is as follows: film A (second resin film) / cured product layer of curable composition b (second cured product layer) / polarizing film / cured product layer of curable composition a (first). The cured product layer) / film B (first resin film), and the absolute value of the difference in refractive index between the first cured product layer and the first resin film was 0.01.
　実施例１：粘着剤層付偏光板の作製
　アクリル系粘着剤の有機溶剤溶液を、離型処理が施された厚さ３８μｍのポリエチレンテレフタレートフィルムの離型処理面に、ダイコーターにて塗工し、乾燥させて、剥離フィルム付きシート状粘着剤層を作製した。なお、粘着剤層の厚みは２０μｍであった。
　作製したシート状粘着剤層から剥離フィルムを剥離し、粘着剤層の屈折率（波長５８９ｎｍ）を２５℃環境下で多波長アッベ屈折計〔（株）アタゴ製“ＤＲ－Ｍ２”〕を用いて測定した。粘着剤層の屈折率は、１．４７であった。 Example 1: Preparation of a polarizing plate with a pressure-sensitive adhesive layer An organic solvent solution of an acrylic pressure-sensitive adhesive is applied to the mold-release-treated surface of a 38 μm-thick polyethylene terephthalate film that has been mold-released with a die coater. , Dried to prepare a sheet-like pressure-sensitive adhesive layer with a release film. The thickness of the pressure-sensitive adhesive layer was 20 μm.
The release film is peeled off from the prepared sheet-shaped pressure-sensitive adhesive layer, and the refractive index (wavelength 589 nm) of the pressure-sensitive adhesive layer is measured in an environment of 25 ° C. using a multi-wavelength Abbe refractometer [“DR-M2” manufactured by Atago Co., Ltd.]. It was measured. The refractive index of the pressure-sensitive adhesive layer was 1.47.
＜粘着剤層付き偏光板の作製＞
　上記偏光板のフィルムＢ（第１樹脂フィルム）表面にコロナ処理を施し、作製例２で作製したシート状粘着剤の剥離フィルムと反対側の面（粘着剤面）をラミネーターにより貼り合わせたのち、温度２３℃、相対湿度６５％の条件で７日間養生して、粘着剤層を設けた粘着剤層付き偏光板を得た。この積層体は粘着剤層の上に、剥離フィルムが貼合された構成なっている。 <Preparation of polarizing plate with adhesive layer>
The surface of the film B (first resin film) of the above polarizing plate is subjected to corona treatment, and the surface (adhesive surface) opposite to the sheet-like adhesive release film produced in Production Example 2 is bonded with a laminator. After curing for 7 days under the conditions of a temperature of 23 ° C. and a relative humidity of 65%, a polarizing plate with an adhesive layer provided with an adhesive layer was obtained. This laminate has a structure in which a release film is bonded on the pressure-sensitive adhesive layer.
＜枚葉体の作成＞
　裁断装置（荻野精機製作所製、スーパーカッター「ＰＮ１－６００」）を用いて、上記粘着剤層付き偏光板を、粘着剤付偏光板をフィルムＡ側から、偏光子の延伸方向（ＭＤ）の長さ５０ｍｍ、偏光子の延伸方向と交差する方向（ＴＤ）の長さ５０ｍｍとなるように裁断した。 <Creation of a single frond>
Using a cutting device (manufactured by Ogino Seiki Seisakusho, Super Cutter "PN1-600"), the above-mentioned polarizing plate with an adhesive layer is attached to the polarizing plate with an adhesive from the film A side, and the length of the polarizing element in the stretching direction (MD). It was cut so as to have a length of 50 mm and a length of 50 mm in a direction (TD) intersecting the stretching direction of the polarizer.
＜端部光漏れ評価＞
　得られた粘着剤層付き偏光板から剥離フィルムを剥がした後、その粘着剤層面を厚さ０．７ｍｍのガラス基板〔コーニング社製の「Ｅａｇｌｅ　ＸＧ」〕の中央に貼着し、積層体を得た。得られた積層体を、バックライトの上に、５０ｍｍ×５０ｍｍのうち１０ｍｍ（ＭＤ）×５０ｍｍ（ＴＤ）の偏光板部分がバックライトの明部からはみ出すように置いた。次いで、バックライトの明部にある偏光板（４０ｍｍ×５０ｍｍ）及びバックライトの明部全体を、黒色のアクリル板で覆った。バックライトの電源を入れ、偏光板正面から８５°（図３におけるθ＝８５°）横の角度から、偏光板の端部を目視で確認した。結果を、以下の基準で判定した。結果を表１に示す。
＜光漏れの判定基準＞
○：光漏れがほとんど視認できない。
△：光漏れが弱く視認できる。
×：光漏れが強く視認できる。 <Evaluation of light leakage at the edge>
After peeling the release film from the obtained polarizing plate with an adhesive layer, the adhesive layer surface is attached to the center of a glass substrate [“Eagle XG” manufactured by Corning Inc.] having a thickness of 0.7 mm to form a laminate. Obtained. The obtained laminate was placed on the backlight so that the polarizing plate portion of 10 mm (MD) × 50 mm (TD) out of 50 mm × 50 mm protruded from the bright part of the backlight. Next, the polarizing plate (40 mm × 50 mm) in the bright part of the backlight and the entire bright part of the backlight were covered with a black acrylic plate. The power of the backlight was turned on, and the end portion of the polarizing plate was visually confirmed from an angle 85 ° (θ = 85 ° in FIG. 3) laterally from the front surface of the polarizing plate. The results were judged according to the following criteria. The results are shown in Table 1.
<Criteria for light leakage>
◯: Light leakage is almost invisible.
Δ: Light leakage is weak and can be visually recognized.
X: Light leakage is strong and can be visually recognized.
　実施例２：偏光板の製造
　第１硬化物層を形成する組成物として、硬化性組成物ｂを使用したこと以外は、実施例１と同様にして粘着剤層付き偏光板を作製し、同様の評価を行った。結果を表１に示す。 Example 2: Production of Polarizing Plate A polarizing plate with an adhesive layer is produced in the same manner as in Example 1 except that the curable composition b is used as the composition for forming the first cured product layer. Was evaluated. The results are shown in Table 1.
　実施例３：偏光板の製造
　フィルムＡの片面にコロナ放電処理を施し、そのコロナ放電処理面に、活性エネルギー線硬化型硬化性組成物ｂを硬化後の厚みが約３．５μｍとなるように塗工した。次いで、その塗工面に製造例１で作製した偏光子を貼合した。次に、フィルムＣのシクロオレフィン系樹脂フィルム面にコロナ放電処理を施し、そのコロナ放電処理面に、活性エネルギー線硬化型硬化性組成物ｂを硬化後の厚みが約２．５μｍとなるように塗工した。その塗工面に、前記で作製したフィルムＡ付きの偏光子を偏光子側で重ね、貼合ロールを用いて押圧、貼合して積層体を得た。得られた積層体に対して、フィルムＣ側からベルトコンベア付の紫外線照射装置〔ランプはフュージョンＵＶシステムズ社製の「Ｄバルブ」使用〕を用いて積算光量が４００ｍＪ／ｃｍ2（ＵＶＢ）となるように紫外線を照射し、両面の接着剤層を硬化させて偏光板を作製した。得られた偏光板の構成は、フィルムＡ（第２樹脂フィルム）／硬化性組成物ｂの硬化物層（第２硬化物層）／偏光フィルム／硬化性組成物ｂの硬化物層（第１硬化物層）／フィルムＣ（シクロオレフィン系樹脂フィルム／樹脂硬化層Ｘ）であり、第１の硬化物層とシクロオレフィン系樹脂フィルムの屈折率差の絶対値は０．０２であった。
　硬化樹脂層Ｘの表面に実施例１と同様にして粘着剤層を形成し、評価を行った。結果を表１に示す。 Example 3: Production of Polarizing Plate A corona discharge treatment is applied to one side of the film A, and the active energy ray-curable curable composition b is applied to the corona discharge treatment surface so that the thickness after curing is about 3.5 μm. I painted it. Next, the polarizer prepared in Production Example 1 was attached to the coated surface. Next, the surface of the cycloolefin-based resin film of the film C is subjected to a corona discharge treatment, and the active energy ray-curable curable composition b is applied to the corona discharge-treated surface so that the thickness after curing is about 2.5 μm. I painted it. The polarizer with the film A produced above was laminated on the coated surface on the polarizer side, and pressed and bonded using a bonding roll to obtain a laminated body. With respect to the obtained laminate, the integrated light amount becomes 400 mJ / cm 2 (UVB) from the film C side using an ultraviolet irradiation device with a belt conveyor [the lamp uses a "D bulb" manufactured by Fusion UV Systems). As described above, ultraviolet rays were irradiated to cure the adhesive layers on both sides to prepare a polarizing plate. The structure of the obtained polarizing plate is as follows: film A (second resin film) / cured product layer of curable composition b (second cured product layer) / polarizing film / cured product layer of curable composition b (first). The cured product layer) / film C (cycloolefin resin film / resin cured layer X), and the absolute value of the refractive index difference between the first cured product layer and the cycloolefin resin film was 0.02.
An adhesive layer was formed on the surface of the cured resin layer X in the same manner as in Example 1, and evaluation was performed. The results are shown in Table 1.
　実施例４：偏光板の製造
　フィルムＣの樹脂硬化層Ｘ面にコロナ放電処理を施し、そのコロナ放電処理面に、活性エネルギー線硬化型硬化性組成物ａを硬化後の厚みが約２．５μｍとなるように塗工したこと以外は、実施例３と同様にして偏光板を作製した。
　得られた偏光板の構成は、フィルムＡ（第２樹脂フィルム）／硬化性組成物ｂの硬化物層（第２硬化物層）／偏光フィルム／硬化性組成物ａの硬化物層（第１硬化物層）／フィルムＣ（樹脂硬化層Ｘ／シクロオレフィン系樹脂フィルム）であり、第１の硬化物層と樹脂硬化層Ｘとの屈折率差の絶対値は０．０３であった。
　シクロオレフィン系樹脂フィルムの表面に実施例１と同様にして粘着剤層を形成し、評価を行った。結果を表１に示す。 Example 4: Production of Polarizing Plate A corona discharge treatment is applied to the resin cured layer X surface of the film C, and the active energy ray-curable curable composition a is cured on the corona discharge treated surface to have a thickness of about 2.5 μm. A polarizing plate was produced in the same manner as in Example 3 except that the coating was applied so as to be.
The structure of the obtained polarizing plate is as follows: film A (second resin film) / cured product layer of curable composition b (second cured product layer) / polarizing film / cured product layer of curable composition a (first). The cured product layer) / film C (resin cured product layer X / cycloolefin-based resin film), and the absolute value of the difference in refractive index between the first cured product layer and the resin cured layer X was 0.03.
An adhesive layer was formed on the surface of the cycloolefin resin film in the same manner as in Example 1, and evaluation was performed. The results are shown in Table 1.
　比較例１：偏光板の製造
　活性エネルギー線硬化性組成物ａを活性エネルギー線硬化性組成物ｂに替えた以外は、実施例４と同様にして粘着剤層付き偏光板を作製し、同様の評価を行った。得られた粘着剤層付き偏光板の構成は、フィルムＡ（第２樹脂フィルム）／硬化性組成物ｂの硬化物層（第２硬化物層）／偏光フィルム／硬化性組成物ｂの硬化物層（第１硬化物層）／フィルムＣ（樹脂硬化層Ｘ／シクロオレフィン系樹脂フィルム）／粘着層であり、第１の硬化物層と樹脂硬化層の屈折率差の絶対値は０．０６であった。結果を表１に示す。 Comparative Example 1: Production of Polarizing Plate A polarizing plate with an adhesive layer was produced in the same manner as in Example 4 except that the active energy ray-curable composition a was replaced with the active energy ray-curable composition b. Evaluation was performed. The structure of the obtained polarizing plate with an adhesive layer is as follows: film A (second resin film) / cured product layer of curable composition b (second cured product layer) / polarizing film / cured product of curable composition b. It is a layer (first cured product layer) / film C (resin cured product layer X / cycloolefin resin film) / adhesive layer, and the absolute value of the refractive index difference between the first cured product layer and the resin cured product layer is 0.06. Met. The results are shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　本発明の粘着剤層付き偏光板は、偏光板の表面から８５°と略横から見た時にも光漏れが抑制される。そのため、表示装置に設けられたベゼルの高さが低下又はベゼルが省略された表示装置に本発明の粘着剤層付き偏光板を組み込んだ場合、偏光板の端部が露出したとしても光漏れが抑制される。 The polarizing plate with an adhesive layer of the present invention suppresses light leakage even when viewed from substantially sideways at 85 ° from the surface of the polarizing plate. Therefore, when the polarizing plate with the adhesive layer of the present invention is incorporated into a display device in which the height of the bezel provided in the display device is lowered or the bezel is omitted, light leakage occurs even if the end portion of the polarizing plate is exposed. It is suppressed.
　本発明の粘着剤層付き偏光板は、ベゼルの幅を狭くした表示装置、ベゼルの高さを低くした表示装置又はベゼルを省略した表示装置に組み込んだとしても、偏光板の端部からの光漏れが小さく有用である。 Even if the polarizing plate with an adhesive layer of the present invention is incorporated into a display device having a narrow bezel width, a display device having a low bezel height, or a display device having an omitted bezel, light from the end of the polarizing plate Leakage is small and useful.
　１　　　　　偏光フィルム
　２　　　　　第１硬化物層
　３　　　　　第１樹脂フィルム
　４　　　　　第２硬化物層
　５　　　　　第２樹脂フィルム
　６　　　　　粘着剤層
　７　　　　　画像表示パネル
　１０　　　　偏光板
　２０　　　　粘着剤層付き偏光板
　３０　　　　画像表示装置
　θ　　　　　偏光板正面からの角度 1 Polarizing film 2 1st cured product layer 3 1st resin film 4 2nd cured product layer 5 2nd resin film 6 Adhesive layer 7 Image display panel 10 Polarizing plate 20 Polarizing plate with adhesive layer 30 Image display device θ Polarizing plate Angle from the front

Claims (7)

  1. 　偏光フィルム、第１硬化物層、第１樹脂フィルム、粘着剤層をこの順に備える粘着剤層付き偏光板であって、
    　偏光フィルムと第１硬化物層とは直接接しており、
    　第一硬化物層と第１樹脂フィルムとは直接接しており、
    　第一樹脂フィルムと粘着剤層とは直接接しており、
    　第１硬化物層の平均屈折率と第１樹脂フィルムの平均屈折率との差の絶対値が０．０３以下である、粘着剤層付き偏光板。     A polarizing plate with an adhesive layer including a polarizing film, a first cured product layer, a first resin film, and an adhesive layer in this order.
    The polarizing film and the first cured product layer are in direct contact with each other.
    The first cured product layer and the first resin film are in direct contact with each other.
    The first resin film and the adhesive layer are in direct contact with each other.
    A polarizing plate with an adhesive layer, wherein the absolute value of the difference between the average refractive index of the first cured product layer and the average refractive index of the first resin film is 0.03 or less.
  2. 　第１硬化物層が、活性エネルギー線硬化型接着剤組成物の硬化物である請求項１に記載の偏光板。 The polarizing plate according to claim 1, wherein the first cured product layer is a cured product of an active energy ray-curable adhesive composition.
  3. 　第１硬化物層の屈折率が１．５５以下である請求項１又は２に記載の偏光板。 The polarizing plate according to claim 1 or 2, wherein the refractive index of the first cured product layer is 1.55 or less.
  4. 　第１樹脂フィルムが、熱可塑性樹脂から形成されるフィルムを含む請求項１～３のいずれかに記載の偏光板。 The polarizing plate according to any one of claims 1 to 3, wherein the first resin film includes a film formed of a thermoplastic resin.
  5. 　第１樹脂フィルムの厚みが６μｍ以上である請求項１～４のいずれかに記載の偏光板。 The polarizing plate according to any one of claims 1 to 4, wherein the thickness of the first resin film is 6 μm or more.
  6. 　偏光フィルムの第１硬化物層とは他方の面に、第２硬化物層を介して第２樹脂フィルムを備える請求項１～５のいずれかに記載の偏光板。 The polarizing plate according to any one of claims 1 to 5, wherein a second resin film is provided on a surface opposite to the first cured product layer of the polarizing film via a second cured product layer.
  7. 　画像表示パネルと、前記画像表示パネルの視認側に配置された請求項１～６のいずれかに記載の粘着剤層付き偏光板とを含む画像表示装置。 An image display device including an image display panel and a polarizing plate with an adhesive layer according to any one of claims 1 to 6, which is arranged on the visual side of the image display panel.
PCT/JP2020/034634 2019-09-20 2020-09-14 Polarizing plate with adhesive layer and image display device WO2021054272A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005521100A (en) * 2002-03-26 2005-07-14 富士写真フイルム株式会社 Polarizing plate and liquid crystal display device
JP2013033237A (en) * 2011-07-01 2013-02-14 Asahi Kasei Chemicals Corp Optical isotropic protective film for polarizing film, and polarizing plate
US20180173049A1 (en) * 2016-06-08 2018-06-21 Wuhan China Star Optoelectronics Techology Co., Ltd Metal wire grid polarizer and liquid crystal display device

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JP4849563B2 (en) 2007-08-07 2012-01-11 住友化学株式会社 Polarizing plate and manufacturing method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005521100A (en) * 2002-03-26 2005-07-14 富士写真フイルム株式会社 Polarizing plate and liquid crystal display device
JP2013033237A (en) * 2011-07-01 2013-02-14 Asahi Kasei Chemicals Corp Optical isotropic protective film for polarizing film, and polarizing plate
US20180173049A1 (en) * 2016-06-08 2018-06-21 Wuhan China Star Optoelectronics Techology Co., Ltd Metal wire grid polarizer and liquid crystal display device

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