JP2014118485A - Adhesive layer and adhesive film - Google Patents

Adhesive layer and adhesive film Download PDF

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JP2014118485A
JP2014118485A JP2012274796A JP2012274796A JP2014118485A JP 2014118485 A JP2014118485 A JP 2014118485A JP 2012274796 A JP2012274796 A JP 2012274796A JP 2012274796 A JP2012274796 A JP 2012274796A JP 2014118485 A JP2014118485 A JP 2014118485A
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pressure
sensitive adhesive
adhesive layer
meth
film
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JP6013898B2 (en
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Takeshi Nagakura
毅 長倉
Ryusuke Shimaguchi
龍介 島口
Makoto Hasegawa
良 長谷川
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Fujimori Kogyo Co Ltd
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Fujimori Kogyo Co Ltd
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Priority to JP2012274796A priority Critical patent/JP6013898B2/en
Priority to KR1020130139689A priority patent/KR101622945B1/en
Priority to TW102142715A priority patent/TWI496860B/en
Priority to TW104122869A priority patent/TWI568814B/en
Priority to CN201310610818.0A priority patent/CN103865445B/en
Publication of JP2014118485A publication Critical patent/JP2014118485A/en
Priority to KR1020150120906A priority patent/KR101701891B1/en
Publication of JP6013898B2 publication Critical patent/JP6013898B2/en
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Priority to KR1020170011789A priority patent/KR101799801B1/en
Priority to KR1020170151985A priority patent/KR101908291B1/en
Priority to KR1020180076826A priority patent/KR102088171B1/en
Priority to KR1020190148179A priority patent/KR102270910B1/en
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    • 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
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • 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
    • 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]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive layer having performances of high adhesive force and high adhesiveness despite a thin film state having a thickness of 1 μm to 20 μm, and to provide an adhesive film using the adhesive layer.SOLUTION: The adhesive layer is formed by crosslinking an adhesive composition comprising an acrylic polymer, wherein the adhesive composition comprises: as a (meth)acrylate monomer as a main component, at least one kind of alkyl (meth)acrylate monomer having 1 to 14 carbon atoms in an alkyl group; and as other copolymerizable monomers, at least one kind of nitrogen-containing vinyl monomer and at least one kind of copolymerizable vinyl monomer containing a carboxyl group and/or copolymerizable vinyl monomer containing a hydroxyl group. The adhesive layer has a thickness of 1 μm to 20 μm, and shows an adhesive force of 4.0 (N/25 mm) or more when the layer is 5-μm thick.

Description

本発明は、光学部材の層間の貼合などに用いられる厚さ１μｍ〜２０μｍの薄膜にも拘わらず、高粘着力、高密着性の性能を有する粘着剤層、及びそれを用いた粘着フィルムに関する。   The present invention relates to a pressure-sensitive adhesive layer having high adhesive strength and high adhesion performance, and a pressure-sensitive adhesive film using the same, despite a thin film having a thickness of 1 μm to 20 μm used for bonding between layers of optical members. .

粘着剤層を介して偏光板、位相差板などの光学部材を液晶セルなどの被着体に貼合するため、種々の粘着フィルムが提案されている（例えば特許文献１〜２参照）。
特許文献１には、ブチルアクリレートなどを主成分のモノマーとし、アクリルアミド化合物などを含有する光学用粘着剤組成物が記載されている。
特許文献２には、炭素数４〜８のアルキル基を有する（メタ）アクリレートを主成分のモノマーとし、カルボキシル基含有モノマー、及び窒素含有ビニルモノマーを含有する光学用粘着剤組成物が記載されている。
また、粘着剤層の屈折率を高めるために、種々の工夫をした粘着フィルムが提案されている（例えば特許文献３〜８参照）。
特許文献３には、芳香族環を有し、屈折率１．５１〜１．７５のタッキファイヤーを含有する光学用粘着剤組成物が記載されている。
特許文献４には、芳香族環を含有するアクリル酸変性モノマーの共重合性ポリマーを含む粘着剤組成物を含有する粘着シートが記載されている。
特許文献５には、芳香族環を有する粘着付与樹脂と、芳香族リン酸エステル系可塑剤を含有する光学用粘着剤組成物が記載されている。
特許文献６には、アクリル系樹脂と、エチレン性不飽和基を１つ含有する芳香族化合物を含有する粘着剤組成物が硬化されてなる粘着剤が記載されている。
特許文献７には、芳香族モノマーを含有するアクリル系の粘着剤を介して、位相差フィルム及び複屈折板を互いに固着してなる光学部品が記載されている。
特許文献８には、芳香族ジイソシアネートと、芳香族ポリエステルジオールを反応させてなるウレタン樹脂を含む粘着剤組成物が記載されている。 Various adhesive films have been proposed for bonding optical members such as a polarizing plate and a retardation plate to an adherend such as a liquid crystal cell via an adhesive layer (see, for example, Patent Documents 1 and 2).
Patent Document 1 describes an optical pressure-sensitive adhesive composition containing acrylamide compound or the like, using butyl acrylate or the like as a main monomer.
Patent Document 2 describes an optical pressure-sensitive adhesive composition containing a (meth) acrylate having a C 4-8 alkyl group as a main component monomer, a carboxyl group-containing monomer, and a nitrogen-containing vinyl monomer. Yes.
Moreover, in order to raise the refractive index of an adhesive layer, the adhesive film which carried out various devices is proposed (for example, refer patent documents 3-8).
Patent Document 3 describes an optical pressure-sensitive adhesive composition having an aromatic ring and containing a tackifier having a refractive index of 1.51 to 1.75.
Patent Document 4 describes a pressure-sensitive adhesive sheet containing a pressure-sensitive adhesive composition containing a copolymerizable polymer of an acrylic acid-modified monomer containing an aromatic ring.
Patent Document 5 describes an optical pressure-sensitive adhesive composition containing a tackifier resin having an aromatic ring and an aromatic phosphate ester plasticizer.
Patent Document 6 describes a pressure-sensitive adhesive obtained by curing a pressure-sensitive adhesive composition containing an acrylic resin and an aromatic compound containing one ethylenically unsaturated group.
Patent Document 7 describes an optical component in which a retardation film and a birefringent plate are fixed to each other via an acrylic pressure-sensitive adhesive containing an aromatic monomer.
Patent Document 8 describes a pressure-sensitive adhesive composition containing a urethane resin obtained by reacting an aromatic diisocyanate and an aromatic polyester diol.

特開２０１２−１７７０２２号公報JP 2012-177022 A 特開２０１２−２０１７３４号公報JP 2012-201734 A 特開２００７−０８４７６２号公報JP 2007-084762 A 特開２０１１−１５３１６９号公報JP 2011-153169 A 特開２０１２−１６７１８８号公報JP 2012-167188 A 特開２０１２−０２１１４８号公報JP 2012-021148 A 特開２００６−２９３２８１号公報JP 2006-293281 A 特開２００９−０９１５２２号公報JP 2009-091522 A

近年において、光学部材の層間を貼合するのに用いる粘着フィルムに対して要求されている事項は、光学部材の薄膜化を図るために、粘着剤層の厚さを２０μｍ以下に薄くした粘着フィルムとすることである。
一般に、粘着剤層の粘着力は、粘着剤層の厚さに略比例していることから、粘着剤層の厚さを薄くすると、それに伴って粘着力が低下してしまう。 In recent years, what is required for an adhesive film used for laminating the layers of optical members is an adhesive film in which the thickness of the adhesive layer is reduced to 20 μm or less in order to reduce the thickness of the optical member. It is to do.
In general, since the adhesive strength of the pressure-sensitive adhesive layer is substantially proportional to the thickness of the pressure-sensitive adhesive layer, when the thickness of the pressure-sensitive adhesive layer is reduced, the adhesive strength is reduced accordingly.

しかし、近年求められている粘着フィルムは、粘着剤層の厚さを薄くしても、従来の粘着フィルム（粘着剤層の厚さが約３０μｍと厚い）と同等の粘着力を有しており、且つ、高温・高湿度の雰囲気下に長時間放置した後の耐久性についても、従来の粘着フィルムと同等以上の性能を有することが求められている。
また、粘着剤層の厚さを薄くできること、及び、エージング処理（恒温で養生を行うこと）を施す必要がない粘着剤層を形成できることから、粘着フィルムの基材を省いた粘着剤層のみからなる、「離型フィルム／粘着剤層／離型フィルム」の部材構成をした、ＮＣＦ（Ｎｏｎ Ｃａｒｒｉｅｒ Ｆｉｌｍ）の形態とすることが求められている。 However, the pressure-sensitive adhesive film required in recent years has the same adhesive strength as the conventional pressure-sensitive adhesive film (thickness of the pressure-sensitive adhesive layer is about 30 μm) even if the thickness of the pressure-sensitive adhesive layer is reduced. In addition, the durability after being left for a long time in an atmosphere of high temperature and high humidity is also required to have performance equal to or higher than that of a conventional adhesive film.
In addition, since the thickness of the pressure-sensitive adhesive layer can be reduced and a pressure-sensitive adhesive layer that does not need to be subjected to aging treatment (curing at constant temperature) can be formed, only from the pressure-sensitive adhesive layer without the base material of the pressure-sensitive adhesive film Therefore, it is required to be in the form of NCF (Non Carrier Film) having a member configuration of “release film / adhesive layer / release film”.

また、従来の粘着フィルムでは、被着体に粘着フィルムを貼り合せた後に、エージング処理が施されるために、被着体と粘着剤層との密着性の向上を図ることができた。
しかしながら、ＮＣＦの形態をした粘着フィルムは、すでに粘着剤層のエージングを終了させていることから、被着体と粘着剤層との密着力が不足する。そのため、被着体の表面に対して、コロナ処理などの表面処理をする必要があるという問題があった。
これらの要求事項および問題を克服した粘着フィルムが、必要とされている。 Moreover, in the conventional adhesive film, since an aging process is performed after bonding an adhesive film to an adherend, the adhesiveness of an adherend and an adhesive layer was able to be improved.
However, since the adhesive film in the form of NCF has already finished the aging of the adhesive layer, the adhesion between the adherend and the adhesive layer is insufficient. Therefore, there has been a problem that the surface of the adherend needs to be subjected to a surface treatment such as a corona treatment.
There is a need for an adhesive film that overcomes these requirements and problems.

本発明は、上記事情に鑑みてなされたものであり、厚さ１μｍ〜２０μｍの薄膜にも拘わらず、高粘着力、高密着性の性能を有する粘着剤層、及びそれを用いた粘着フィルムを提供することを課題とする。   This invention is made | formed in view of the said situation, Despite the thin film of thickness 1 micrometer-20 micrometers, the adhesive layer which has the performance of high adhesive force and high adhesiveness, and an adhesive film using the same The issue is to provide.

上記の課題を解決するため、本発明は、アクリル系ポリマーからなる粘着剤組成物を架橋してなる粘着剤層において、アルキル基の炭素数がＣ１〜Ｃ１４のアルキル（メタ）アクリレートモノマーの少なくとも１種を主成分のモノマーとし、他の共重合性モノマーとして、共重合可能な窒素含有ビニルモノマーの少なくとも１種以上を含有させて、共重合及び架橋させることにより、強靭な粘着力と高密着性の性能を有する粘着剤層とすることを技術思想としている。
また、上記の課題を解決するため、本発明は、アクリル系ポリマーからなる粘着剤組成物を架橋してなる粘着剤層において、前記粘着剤組成物が、主成分の（メタ）アクリレートモノマーとして、アルキル基の炭素数がＣ１〜Ｃ１４のアルキル（メタ）アクリレートモノマーの少なくとも１種以上を含有し、他の共重合性モノマーとして、窒素含有ビニルモノマーの少なくとも１種以上と、カルボキシル基を含有する共重合性ビニルモノマー及び／又はヒドロキシル基を含有する共重合性ビニルモノマーの少なくとも１種以上と、を含有し、前記粘着剤層の厚さが１μｍ〜２０μｍであり、厚さが５μｍの時の粘着力が４．０（Ｎ／２５ｍｍ）以上であることを特徴とする粘着剤層を提供する。 In order to solve the above problems, the present invention provides at least one alkyl (meth) acrylate monomer having a C1-C14 alkyl group in a pressure-sensitive adhesive layer obtained by crosslinking a pressure-sensitive adhesive composition comprising an acrylic polymer. By having at least one kind of copolymerizable nitrogen-containing vinyl monomer as the main monomer and other copolymerizable monomers, copolymerization and cross-linking, tough adhesion and high adhesion The technical idea is to provide a pressure-sensitive adhesive layer having the above performance.
In order to solve the above problems, the present invention provides a pressure-sensitive adhesive layer obtained by crosslinking a pressure-sensitive adhesive composition comprising an acrylic polymer, wherein the pressure-sensitive adhesive composition is a main component (meth) acrylate monomer, The alkyl group contains at least one alkyl (meth) acrylate monomer having C1 to C14 carbon atoms, and as another copolymerizable monomer, at least one nitrogen-containing vinyl monomer and a carboxyl group-containing copolymer. At least one kind of a polymerizable vinyl monomer and / or a copolymerizable vinyl monomer containing a hydroxyl group, the pressure-sensitive adhesive layer having a thickness of 1 μm to 20 μm and a thickness of 5 μm The pressure-sensitive adhesive layer is characterized by having a force of 4.0 (N / 25 mm) or more.

また、前記粘着剤組成物が、（Ａ）アルキル基の炭素数がＣ１〜Ｃ１４のアルキル（メタ）アクリレートモノマーの少なくとも１種以上を合せた主成分の（メタ）アクリレートモノマー１００重量部に対して、（Ｂ）窒素含有ビニルモノマーの１種以上を５〜５０重量部と、（Ｃ）カルボキシル基を含有する共重合性ビニルモノマー及び／又はヒドロキシル基を含有する共重合性ビニルモノマーの少なくとも１種以上を０．１〜５重量部と、を含有する重量平均分子量２０万〜２００万の共重合体、及び（Ｄ）架橋剤を０．０１〜５重量部を、含有することが好ましい。   In addition, the pressure-sensitive adhesive composition is based on 100 parts by weight of the main component (meth) acrylate monomer in which (A) at least one alkyl (meth) acrylate monomer having an alkyl group of C1 to C14 is combined. , (B) 5 to 50 parts by weight of at least one nitrogen-containing vinyl monomer, and (C) at least one copolymerizable vinyl monomer containing a carboxyl group and / or a copolymerizable vinyl monomer containing a hydroxyl group It is preferable to contain 0.1-5 parts by weight of a copolymer having a weight average molecular weight of 200,000 to 2,000,000 and (D) a crosslinking agent in an amount of 0.01 to 5 parts by weight.

また、前記粘着剤組成物が、前記主成分の（メタ）アクリレートモノマー１００重量部の内、メチルアクリレートのモノマーを２０重量部以上の割合で含有することが好ましい。   Moreover, it is preferable that the said adhesive composition contains the monomer of methyl acrylate in the ratio of 20 weight part or more in 100 weight part of the (meth) acrylate monomers of the said main component.

また、前記粘着剤組成物が、前記主成分の（メタ）アクリレートモノマー１００重量部に対して、カルボキシル基を含有する共重合性ビニルモノマーの１種以上を２．０重量部以下、及び／又は、ヒドロキシル基を含有する共重合性ビニルモノマーの１種以上を５．０重量部以下の割合で含有することが好ましい。   In addition, the pressure-sensitive adhesive composition may contain 2.0 parts by weight or less of one or more copolymerizable vinyl monomers containing a carboxyl group with respect to 100 parts by weight of the main component (meth) acrylate monomer, and / or It is preferable to contain at least 5.0 parts by weight of at least one copolymerizable vinyl monomer containing a hydroxyl group.

また、前記粘着剤層の屈折率が１．４７〜１．５０であることが好ましい。   Moreover, it is preferable that the refractive index of the said adhesive layer is 1.47-1.50.

また、本発明は、前記粘着剤層が、離型フィルムの片面に形成されてなり、離型フィルム／粘着剤層／離型フィルムの構成であることを特徴とする粘着フィルムを提供する。   Moreover, this invention provides the adhesive film characterized by the said adhesive layer being formed in the single side | surface of a release film, and being the structure of a release film / adhesive layer / release film.

また、本発明は、基材の片面上に、前記粘着剤層が積層されてなることを特徴とする粘着フィルムを提供する。   The present invention also provides a pressure-sensitive adhesive film, wherein the pressure-sensitive adhesive layer is laminated on one side of a substrate.

また、本発明は、前記粘着フィルムが用いられた、偏光板の周辺部材用フィルムを提供する。   Moreover, this invention provides the film for peripheral members of a polarizing plate using the said adhesive film.

また、本発明は、前記粘着フィルムが用いられた、タッチパネル用フィルムを提供する。   Moreover, this invention provides the film for touchscreens in which the said adhesive film was used.

また、本発明は、前記粘着フィルムが用いられた、電子ペーパー用フィルムを提供する。   Moreover, this invention provides the film for electronic papers using the said adhesive film.

また、本発明は、前記粘着フィルムが用いられた、有機ＥＬ用フィルムを提供する。   Moreover, this invention provides the film for organic EL in which the said adhesive film was used.

また、本発明は、光学フィルムの少なくとも一方の面に、前記粘着剤層が積層されてなる粘着剤層付き光学フィルムを提供する。   Moreover, this invention provides the optical film with an adhesive layer formed by laminating | stacking the said adhesive layer on the at least one surface of an optical film.

本発明によれば、従来の要求事項および問題を克服して、厚さ１μｍ〜２０μｍの薄膜にも拘わらず、高粘着力、高密着性の性能を有する粘着剤層、及びそれを用いた粘着フィルムを提供することができる。   According to the present invention, a pressure-sensitive adhesive layer having high adhesive strength and high adhesion performance in spite of a thin film having a thickness of 1 μm to 20 μm overcoming conventional requirements and problems, and an adhesive using the same A film can be provided.

以下、好適な実施の形態に基づいて本発明を説明する。
本発明の粘着剤層は、アクリル系ポリマーからなる粘着剤組成物を架橋してなる粘着剤層において、前記粘着剤組成物が、主成分の（メタ）アクリレートモノマーとして、アルキル基の炭素数がＣ１〜Ｃ１４のアルキル（メタ）アクリレートモノマーの少なくとも１種以上を含有し、他の共重合性モノマーとして、窒素含有ビニルモノマーの少なくとも１種以上と、カルボキシル基を含有する共重合性ビニルモノマー及び／又はヒドロキシル基を含有する共重合性ビニルモノマーの少なくとも１種以上と、を含有し、前記粘着剤層の厚さが１μｍ〜２０μｍであり、厚さが５μｍの時の粘着力が４．０（Ｎ／２５ｍｍ）以上であることを特徴とする。 Hereinafter, the present invention will be described based on preferred embodiments.
The pressure-sensitive adhesive layer of the present invention is a pressure-sensitive adhesive layer formed by crosslinking a pressure-sensitive adhesive composition made of an acrylic polymer. The pressure-sensitive adhesive composition has a carbon number of an alkyl group as a main component (meth) acrylate monomer. It contains at least one or more C1-C14 alkyl (meth) acrylate monomers, and as another copolymerizable monomer, at least one nitrogen-containing vinyl monomer, a copolymerizable vinyl monomer containing a carboxyl group, and / or Or at least one copolymerizable vinyl monomer containing a hydroxyl group, and the pressure-sensitive adhesive layer has a thickness of 1 μm to 20 μm and an adhesive force of 4.0 μm when the thickness is 5 μm. N / 25 mm) or more.

アルキル基の炭素数がＣ１〜Ｃ１４のアルキル（メタ）アクリレートモノマーとしては、メチル（メタ）アクリレート、エチル（メタ）アクリレート、プロピル（メタ）アクリレート、イソプロピル（メタ）アクリレート、ブチル（メタ）アクリレート、イソブチル（メタ）アクリレート、ペンチル（メタ）アクリレート、ヘキシル（メタ）アクリレート、ヘプチル（メタ）アクリレート、オクチル（メタ）アクリレート、イソオクチル（メタ）アクリレート、２−エチルヘキシル（メタ）アクリレート、ノニル（メタ）アクリレート、イソノニル（メタ）アクリレート、デシル（メタ）アクリレート、ウンデシル（メタ）アクリレート、ドデシル（メタ）アクリレート、トリデシル（メタ）アクリレート、テトラデシル（メタ）アクリレート、シクロペンチル（メタ）アクリレート、シクロヘキシル（メタ）アクリレートなどの少なくとも１種以上が挙げられる。アルキル（メタ）アクリレートモノマーのアルキル基は、直鎖、分枝状、環状のいずれでもよい。アルキル基の炭素数がＣ１〜Ｃ１４の（メタ）アクリル酸エステルモノマーは、粘着剤組成物のアクリル系ポリマー（共重合体）１００重量部に対する割合が、５０〜９５重量部であることが好ましい。
また、本願発明に係わる粘着剤層においては、粘着剤組成物が、アルキル基の炭素数がＣ１〜Ｃ１４のアルキル（メタ）アクリレートモノマーの１種以上からなる主成分の（メタ）アクリレートモノマー１００重量部の内、メチルアクリレートのモノマーを２０重量部以上の割合で含有することにより、粘着剤層の屈折率を、１．４７以上に高めることができる。 Examples of the alkyl (meth) acrylate monomer having a C1-C14 alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, and isobutyl. (Meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, isononyl (Meth) acrylate, decyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate , Cyclopentyl (meth) acrylate, and at least one kind such as cyclohexyl (meth) acrylate. The alkyl group of the alkyl (meth) acrylate monomer may be linear, branched or cyclic. The (meth) acrylic acid ester monomer having an alkyl group with C1 to C14 preferably has a ratio of 50 to 95 parts by weight based on 100 parts by weight of the acrylic polymer (copolymer) in the pressure-sensitive adhesive composition.
Further, in the pressure-sensitive adhesive layer according to the present invention, the pressure-sensitive adhesive composition has a main component (meth) acrylate monomer consisting of at least one alkyl (meth) acrylate monomer having an alkyl group with C1 to C14 carbon atoms of 100 weight. The refractive index of the pressure-sensitive adhesive layer can be increased to 1.47 or more by containing methyl acrylate monomer in a proportion of 20 parts by weight or more.

本発明に係わる粘着剤組成物には、さらに、主成分の（メタ）アクリレートモノマーとして、芳香族基を含有する（メタ）アクリレートモノマーの１種以上を含有させることができる。芳香族基を含有する（メタ）アクリレートモノマーとしては、べンジル（メタ）アクリレート、ナフチル（メタ）アクリレート、フェノキシエチル（メタ）アクリレート、フェノキシブチル（メタ）アクリレート、２−（１−ナフチルオキシ）エチル（メタ）アクリレート、２−（２−ナフチルオキシ）エチル（メタ）アクリレート、６−（１−ナフチルオキシ）ヘキシル（メタ）アクリレート、６−（２−ナフチルオキシ）ヘキシル（メタ）アクリレート、８−（１−ナフチルオキシ）オクチル（メタ）アクリレート、８−（２−ナフチルオキシ）オクチル（メタ）アクリレートなどが挙げられる。屈折率が高い粘着剤層を得るためには、芳香族基を含有する（メタ）アクリレートモノマーの少なくとも１種以上を配合することが好ましい。   The pressure-sensitive adhesive composition according to the present invention may further contain one or more (meth) acrylate monomers containing an aromatic group as the main component (meth) acrylate monomer. As the (meth) acrylate monomer containing an aromatic group, benzyl (meth) acrylate, naphthyl (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxybutyl (meth) acrylate, 2- (1-naphthyloxy) ethyl (Meth) acrylate, 2- (2-naphthyloxy) ethyl (meth) acrylate, 6- (1-naphthyloxy) hexyl (meth) acrylate, 6- (2-naphthyloxy) hexyl (meth) acrylate, 8- ( 1-naphthyloxy) octyl (meth) acrylate, 8- (2-naphthyloxy) octyl (meth) acrylate, and the like. In order to obtain a pressure-sensitive adhesive layer having a high refractive index, it is preferable to blend at least one of (meth) acrylate monomers containing an aromatic group.

これらの芳香族基を含有する（メタ）アクリレートモノマーを、主成分のモノマーであるアルキル基の炭素数がＣ１〜Ｃ１４のアルキル（メタ）アクリレートモノマーと混合することにより、得られる粘着剤層の屈折率を上昇させて調整でき、光学部材間の屈折率差を少なくして、全反射を低減させることにより全光線透過率を向上させることができる。本発明に係わる粘着剤層において、粘着剤組成物に芳香族基を含有する（メタ）アクリレートモノマーを含有させる場合は、主成分の（メタ）アクリレートモノマー１００重量部に対して、５〜３０重量部の割合で含有させるのが好ましい。
また、芳香族基を含有する（メタ）アクリレートモノマーを共重合させることにより、上記の主成分の（メタ）アクリレートモノマー１００重量部の内、メチルアクリレートのモノマーを２０重量部以上の割合で含有させて粘着剤層の屈折率を高める効果よりも、さらに粘着剤層の屈折率を高めることができる。
また、上記のとおり、粘着剤層の屈折率を高める方法として、主成分の（メタ）アクリレートモノマー１００重量部の内、メチルアクリレートのモノマーを２０重量部以上の割合で含有させる方法と、芳香族基を含有する（メタ）アクリレートモノマーを共重合させる方法との２つの方法があり、それぞれの方法を単独で採用できるが、その２つの方法を併用することがより好ましい。 The refraction of the pressure-sensitive adhesive layer obtained by mixing these aromatic group-containing (meth) acrylate monomers with an alkyl (meth) acrylate monomer having a C1 to C14 alkyl group as the main component monomer. The total light transmittance can be improved by decreasing the refractive index difference between the optical members and reducing the total reflection. In the pressure-sensitive adhesive layer according to the present invention, when the pressure-sensitive adhesive composition contains a (meth) acrylate monomer containing an aromatic group, 5 to 30 weights with respect to 100 parts by weight of the main component (meth) acrylate monomer. It is preferable to make it contain in the ratio of a part.
In addition, by copolymerizing an aromatic group-containing (meth) acrylate monomer, out of 100 parts by weight of the main component (meth) acrylate monomer, the methyl acrylate monomer is contained in a proportion of 20 parts by weight or more. Thus, the refractive index of the pressure-sensitive adhesive layer can be further increased than the effect of increasing the refractive index of the pressure-sensitive adhesive layer.
In addition, as described above, as a method for increasing the refractive index of the pressure-sensitive adhesive layer, a method of containing a methyl acrylate monomer in a proportion of 20 parts by weight or more out of 100 parts by weight of the main component (meth) acrylate monomer, and aromatic There are two methods, that is, a method of copolymerizing a (meth) acrylate monomer containing a group, and each method can be employed alone, but it is more preferable to use the two methods in combination.

窒素含有ビニルモノマーとしては、例えばＮ−ビニルピロリドン、Ｎ−ビニルカプロラクタム、（メタ）アクリロイルモルホリンなどの環状窒素ビニル化合物、Ｎ−エチル−Ｎ−メチル（メタ）アクリルアミド、Ｎ−メチル−Ｎ−プロピル（メタ）アクリルアミド、Ｎ−メチル−Ｎ−イソプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジメチル（メタ）アクリルアミド、Ｎ，Ｎ−ジエチル（メタ）アクリルアミド、Ｎ，Ｎ−ジプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジイソプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジブチル（メタ）アクリルアミドなどのジアルキル置換（メタ）アクリルアミド、Ｎ−エチル−Ｎ−メチルアミノエチル（メタ）アクリレート、Ｎ−メチル−Ｎ−プロピルアミノエチル（メタ）アクリレート、Ｎ−メチル−Ｎ−イソプロピルアミノエチル（メタ）アクリレート、Ｎ，Ｎ−ジメチルアミノメチル（メタ）アクリレート、Ｎ，Ｎ−ジメチルアミノエチル（メタ）アクリレート、Ｎ，Ｎ−ジメチルアミノプロピル（メタ）アクリレート、Ｎ，Ｎ−ジメチルアミノブチル（メタ）アクリレート、Ｎ，Ｎ−ジプロピルアミノエチル（メタ）アクリレート、Ｎ，Ｎ−ジブチルアミノエチル（メタ）アクリレートなどのジアルキルアミノ（メタ）アクリレート、Ｎ−エチル−Ｎ−メチルアミノプロピル（メタ）アクリルアミド、Ｎ−メチル−Ｎ−プロピルアミノプロピル（メタ）アクリルアミド、Ｎ−メチル−Ｎ−イソプロピルアミノプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジメチルアミノプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジエチルアミノプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジプロピルアミノプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジメチルアミノエチル（メタ）アクリルアミド、Ｎ，Ｎ−ジエチルアミノエチル（メタ）アクリルアミドなどのジアルキル置換アミノアルキル（メタ）アクリルアミドなどの少なくとも１種以上が挙げられる。   Examples of the nitrogen-containing vinyl monomer include cyclic nitrogen vinyl compounds such as N-vinylpyrrolidone, N-vinylcaprolactam, (meth) acryloylmorpholine, N-ethyl-N-methyl (meth) acrylamide, N-methyl-N-propyl ( (Meth) acrylamide, N-methyl-N-isopropyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N, N-dipropyl (meth) acrylamide, N, N- Dialkyl-substituted (meth) acrylamides such as diisopropyl (meth) acrylamide, N, N-dibutyl (meth) acrylamide, N-ethyl-N-methylaminoethyl (meth) acrylate, N-methyl-N-propylaminoethyl (meth) Acrylate, N-methyl- -Isopropylaminoethyl (meth) acrylate, N, N-dimethylaminomethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, N, N-dimethyl Dialkylamino (meth) acrylates such as aminobutyl (meth) acrylate, N, N-dipropylaminoethyl (meth) acrylate, N, N-dibutylaminoethyl (meth) acrylate, N-ethyl-N-methylaminopropyl ( (Meth) acrylamide, N-methyl-N-propylaminopropyl (meth) acrylamide, N-methyl-N-isopropylaminopropyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, N, N-diethylaminopropylene Dialkyl-substituted aminoalkyl (meth) acrylamides such as (meth) acrylamide, N, N-dipropylaminopropyl (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylamide, N, N-diethylaminoethyl (meth) acrylamide And at least one of them.

前記窒素含有ビニルモノマーとしては、後述する（Ｃ）の化合物と区別可能とするため、水酸基を含有しないものが好ましく、水酸基およびカルボキシル基を含有しないものがより好ましい。このようなモノマーとしては、上に例示したモノマー、例えば、Ｎ，Ｎ−ジアルキル置換アミノ基やＮ，Ｎ−ジアルキル置換アミド基を含有するアクリル系モノマー；Ｎ−ビニルピロリドン、Ｎ−ビニルカプロラクタムなどのＮ−ビニル置換ラクタム類；Ｎ−（メタ）アクリロイルモルホリンなどのＮ−（メタ）アクリロイル置換環状アミン類が好ましい。   The nitrogen-containing vinyl monomer is preferably one that does not contain a hydroxyl group, and more preferably one that does not contain a hydroxyl group and a carboxyl group, in order to be distinguishable from the compound (C) described later. Examples of such monomers include the monomers exemplified above, for example, acrylic monomers containing an N, N-dialkyl-substituted amino group or an N, N-dialkyl-substituted amide group; N-vinylpyrrolidone, N-vinylcaprolactam, etc. N-vinyl substituted lactams; N- (meth) acryloyl substituted cyclic amines such as N- (meth) acryloylmorpholine are preferred.

また、本発明に係わる粘着剤層において、粘着剤組成物に含有させる窒素含有ビニルモノマーは、粘着剤層に対して必要な粘着力及び耐久性を付与させることができる。本発明に係わる粘着剤層において、粘着剤組成物に含有させる窒素含有ビニルモノマーは、主成分の（メタ）アクリレートモノマー１００重量部に対して、５〜５０重量部であることが好ましい。
また、本発明に係わる粘着剤層において、粘着剤組成物に含有させる窒素含有ビニルモノマーとしては、Ｎ−ビニルピロリドン、Ｎ，Ｎ−ジメチル（メタ）アクリルアミド、Ｎ，Ｎ−ジエチル（メタ）アクリルアミド、Ｎ，Ｎ−ジプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジイソプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジブチル（メタ）アクリルアミド、Ｎ，Ｎ−ジメチルアミノプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジエチルアミノプロピル（メタ）アクリルアミド、Ｎ，Ｎ−ジメチルアミノエチル（メタ）アクリルアミド、Ｎ−ビニルカプロラクタムなどが特に好適に使用される。 Moreover, in the pressure-sensitive adhesive layer according to the present invention, the nitrogen-containing vinyl monomer contained in the pressure-sensitive adhesive composition can impart the necessary adhesive force and durability to the pressure-sensitive adhesive layer. In the pressure-sensitive adhesive layer according to the present invention, the nitrogen-containing vinyl monomer contained in the pressure-sensitive adhesive composition is preferably 5 to 50 parts by weight with respect to 100 parts by weight of the main component (meth) acrylate monomer.
In the pressure-sensitive adhesive layer according to the present invention, the nitrogen-containing vinyl monomer contained in the pressure-sensitive adhesive composition includes N-vinylpyrrolidone, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N, N-dipropyl (meth) acrylamide, N, N-diisopropyl (meth) acrylamide, N, N-dibutyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, N, N-diethylaminopropyl (meth) ) Acrylamide, N, N-dimethylaminoethyl (meth) acrylamide, N-vinylcaprolactam and the like are particularly preferably used.

カルボキシル基を含有する共重合性ビニルモノマー（カルボキシル基含有モノマー）としては、例えば、（メタ）アクリル酸、カルボキシエチル（メタ）アクリレート、カルボキシペンチル（メタ）アクリレート、２−（メタ）アクリロイロキシエチルヘキサヒドロフタル酸、２−（メタ）アクリロイロキシプロピルヘキサヒドロフタル酸、２−（メタ）アクリロイロキシエチルフタル酸、２−（メタ）アクリロイロキシエチルコハク酸、２−（メタ）アクリロイロキシエチルマレイン酸、カルボキシポリカプロラクトンモノ（メタ）アクリレート、２−（メタ）アクリロイロキシエチルテトラヒドロフタル酸などの少なくとも１種以上が挙げられる。
また、本発明に係わる粘着剤層において、粘着剤組成物に含有させるカルボキシル基含有モノマーは、粘着剤層に対して必要な凝集力を付与させることができる。本発明に係わる粘着剤層において、粘着剤組成物に含有させるカルボキシル基含有モノマーは、主成分の（メタ）アクリレートモノマー１００重量部に対して、０．１〜５重量部であることが好ましい。 Examples of the copolymerizable vinyl monomer (carboxyl group-containing monomer) containing a carboxyl group include (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, and 2- (meth) acryloyloxyethyl. Hexahydrophthalic acid, 2- (meth) acryloyloxypropyl hexahydrophthalic acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxyethyl succinic acid, 2- (meth) acryloyl Examples thereof include at least one or more of roxyethylmaleic acid, carboxypolycaprolactone mono (meth) acrylate, 2- (meth) acryloyloxyethyltetrahydrophthalic acid and the like.
In the pressure-sensitive adhesive layer according to the present invention, the carboxyl group-containing monomer to be contained in the pressure-sensitive adhesive composition can impart the necessary cohesive force to the pressure-sensitive adhesive layer. In the pressure-sensitive adhesive layer according to the present invention, the carboxyl group-containing monomer contained in the pressure-sensitive adhesive composition is preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the main component (meth) acrylate monomer.

ヒドロキシル基を含有する共重合性ビニルモノマー（ヒドロキシル基含有モノマー）としては、例えば、８−ヒドロキシオクチル（メタ）アクリレート、６−ヒドロキシヘキシル（メタ）アクリレート、４−ヒドロキシブチル（メタ）アクリレート、ヒドロキシエチル（メタ）アクリレート等のヒドロキシアルキル（メタ）アクリレート類や、Ｎ−ヒドロキシ（メタ）アクリルアミド、Ｎ−ヒドロキシメチル（メタ）アクリルアミド、Ｎ−ヒドロキシエチル（メタ）アクリルアミド等のヒドロキシル基含有（メタ）アクリルアミド類などの少なくとも１種以上が挙げられる。
また、本発明に係わる粘着剤層において、粘着剤組成物に含有させるヒドロキシル基含有モノマーは、得られる粘着剤層が透明導電性フィルムのＩＴＯ表面などの腐食し易い被着体に対する腐食性に影響を与えるとされる、カルボキシル基含有モノマーの含有量を減らすための共重合性モノマーとして使用できる。そのため、ヒドロキシル基含有モノマーは、粘着剤層の粘着力を向上させ、且つ、腐食性を低減させることに役立てることができる。本発明に係わる粘着剤層において、粘着剤組成物に含有させるヒドロキシル基含有モノマーは、主成分の（メタ）アクリレートモノマー１００重量部に対して、０．１〜５重量部であることが好ましい。 Examples of the copolymerizable vinyl monomer containing a hydroxyl group (hydroxyl group-containing monomer) include 8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and hydroxyethyl. Hydroxyalkyl (meth) acrylates such as (meth) acrylate and hydroxyl group-containing (meth) acrylamides such as N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, and N-hydroxyethyl (meth) acrylamide And at least one of them.
Further, in the pressure-sensitive adhesive layer according to the present invention, the hydroxyl group-containing monomer contained in the pressure-sensitive adhesive composition affects the corrosivity of the obtained pressure-sensitive adhesive layer to an easily corroded adherend such as the ITO surface of the transparent conductive film. Can be used as a copolymerizable monomer for reducing the content of the carboxyl group-containing monomer. Therefore, the hydroxyl group-containing monomer can be used for improving the adhesive strength of the pressure-sensitive adhesive layer and reducing the corrosivity. In the pressure-sensitive adhesive layer according to the present invention, the hydroxyl group-containing monomer contained in the pressure-sensitive adhesive composition is preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the main component (meth) acrylate monomer.

本発明の粘着剤層に用いる粘着剤組成物の共重合体は、（Ａ）アルキル基の炭素数がＣ１〜Ｃ１４のアルキル（メタ）アクリレートモノマーの少なくとも１種以上を合せた主成分の（メタ）アクリレートモノマー１００重量部に対して、（Ｂ）窒素含有ビニルモノマーの１種以上を５〜５０重量部と、（Ｃ）カルボキシル基を含有する共重合性ビニルモノマー及び／又はヒドロキシル基を含有する共重合性ビニルモノマーの少なくとも１種以上を０．１〜５重量部と、を含有することが好ましい。
また、主成分の（メタ）アクリレートモノマー１００重量部に対して、カルボキシル基を含有する共重合性ビニルモノマーの１種以上を２．０重量部以下、及び／又は、ヒドロキシル基を含有する共重合性ビニルモノマーの１種以上を５．０重量部以下の割合で含有することが好ましい。 The copolymer of the pressure-sensitive adhesive composition used for the pressure-sensitive adhesive layer of the present invention is composed of (A) a main component (meta) comprising at least one alkyl (meth) acrylate monomer having a C1-C14 alkyl group. ) 5 to 50 parts by weight of (B) one or more kinds of nitrogen-containing vinyl monomers and (C) a copolymerizable vinyl monomer containing a carboxyl group and / or a hydroxyl group with respect to 100 parts by weight of acrylate monomer. It is preferable to contain 0.1 to 5 parts by weight of at least one copolymerizable vinyl monomer.
Also, the copolymer containing at least 2.0 parts by weight of a copolymerizable vinyl monomer containing a carboxyl group and / or containing a hydroxyl group with respect to 100 parts by weight of the main component (meth) acrylate monomer. It is preferable to contain one or more of the functional vinyl monomers in a proportion of 5.0 parts by weight or less.

共重合体の重合方法は、特に限定されるものではなく、溶液重合法、乳化重合法等、適宜、公知の重合方法が使用可能である。共重合体の重量平均分子量は、２０万〜２００万であることが好ましい。
前記共重合体は、アクリル系ポリマーであることが好ましく、（メタ）アクリル酸エステルモノマーや（メタ）アクリル酸、（メタ）アクリルアミド類などのアクリル系モノマーを５０〜１００重量％含むことが好ましい。 The polymerization method of the copolymer is not particularly limited, and a known polymerization method such as a solution polymerization method and an emulsion polymerization method can be used as appropriate. The weight average molecular weight of the copolymer is preferably 200,000 to 2,000,000.
The copolymer is preferably an acrylic polymer, and preferably contains 50 to 100% by weight of an acrylic monomer such as a (meth) acrylic acid ester monomer, (meth) acrylic acid, or (meth) acrylamide.

前記粘着剤組成物は、上記の共重合体に、架橋剤や、適宜任意の添加剤を配合することで、必要とされる物性値などの特性を調整することができる。
架橋剤としては、例えば、ヘキサメチレンジイソシアネート、イソホロンジイソシアネート、ジフェニルメタンジイソシアネート、トリレンジイソシアネート、キシリレンジイソシアネート等のジイソシアネート類のビュレット変性体やイソシアヌレート変性体、トリメチロールプロパンや、グリセリン等の３価以上のポリオールとのアダクト体などのポリイソシアネート化合物、金属系キレート化合物、エポキシ化合物などの少なくとも１種以上が挙げられる。また、紫外線など光架橋により粘着剤を架橋しても良い。
架橋剤を用いて共重合体を架橋する場合、共重合体が、架橋剤と架橋反応可能な官能基（架橋剤の種類にもよるが、ヒドロキシル基やカルボキシル基など）を有することが好ましく、また、これらの官能基を側鎖に有するモノマーを含有することが好ましい。また、粘着剤組成物が、（Ｄ）架橋剤を０．０１〜５重量部を、含有することが好ましい。なお、重量部の基準は、前記共重合体における（Ａ）から（Ｃ）と同じである。 The pressure-sensitive adhesive composition can adjust properties such as required physical property values by blending the above-mentioned copolymer with a crosslinking agent or an arbitrary additive as appropriate.
As the crosslinking agent, for example, a buret modified product of a diisocyanate such as hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, xylylene diisocyanate, an isocyanurate modified product, trimethylol propane, or a trivalent or higher valent compound such as glycerin. Examples thereof include at least one or more of a polyisocyanate compound such as an adduct with a polyol, a metal chelate compound, and an epoxy compound. Further, the pressure-sensitive adhesive may be crosslinked by photocrosslinking such as ultraviolet rays.
When the copolymer is cross-linked using a cross-linking agent, the copolymer preferably has a functional group capable of cross-linking reaction with the cross-linking agent (such as a hydroxyl group or a carboxyl group, depending on the type of the cross-linking agent) Moreover, it is preferable to contain the monomer which has these functional groups in a side chain. Moreover, it is preferable that an adhesive composition contains 0.01-5 weight part of (D) crosslinking agents. In addition, the reference | standard of a weight part is the same as (A) to (C) in the said copolymer.

その他任意の成分として、シランカップリング剤、酸化防止剤、界面活性剤、硬化促進剤、可塑剤、充填剤、架橋触媒、架橋遅延剤、硬化遅延剤、加工助剤、老化防止剤などの公知の添加剤を適宜に配合することができる。これらは、単独で、もしくは２種以上併せて用いてもよい。   Other known optional components such as silane coupling agents, antioxidants, surfactants, curing accelerators, plasticizers, fillers, crosslinking catalysts, crosslinking retarders, cure retarders, processing aids, anti-aging agents, etc. These additives can be appropriately blended. These may be used alone or in combination of two or more.

本発明の粘着剤層は、前記粘着剤組成物を基材や離型フィルムに塗布した後、粘着剤組成物を架橋することで得ることができる。
光学部材の層間の貼合などに用いる場合、薄い粘着剤層であることが望ましく、前記粘着剤層の厚さが１μｍ〜２０μｍであることが好ましい。また、一般に、粘着剤層の粘着力は、粘着剤層の厚さに略比例しているが、厚さが５μｍの時の粘着力が４．０（Ｎ／２５ｍｍ）以上であることが好ましい。なお、粘着剤層の厚さが５μｍでない場合、「厚さが５μｍの時の粘着力」（Ｎ／２５ｍｍ）は、粘着剤層の厚さをＴ（μｍ）、粘着剤層の粘着力をＦ（Ｎ／２５ｍｍ）として、数式「（厚さが５μｍの時の粘着力）＝５Ｆ／Ｔ」により推定することができる。 The pressure-sensitive adhesive layer of the present invention can be obtained by crosslinking the pressure-sensitive adhesive composition after applying the pressure-sensitive adhesive composition to a substrate or a release film.
When used for bonding between layers of an optical member, it is desirable that it is a thin pressure-sensitive adhesive layer, and the thickness of the pressure-sensitive adhesive layer is preferably 1 μm to 20 μm. In general, the adhesive strength of the pressure-sensitive adhesive layer is substantially proportional to the thickness of the pressure-sensitive adhesive layer, but the adhesive strength when the thickness is 5 μm is preferably 4.0 (N / 25 mm) or more. . In addition, when the thickness of the pressure-sensitive adhesive layer is not 5 μm, “the pressure-sensitive adhesive strength when the thickness is 5 μm” (N / 25 mm) is the pressure-sensitive adhesive layer thickness T (μm) and the pressure-sensitive adhesive strength of the pressure-sensitive adhesive layer. As F (N / 25 mm), it can be estimated by the formula “(Adhesive strength when thickness is 5 μm) = 5 F / T”.

本発明に係わる粘着剤層を、光学部材の層間の貼合などに用いる場合、粘着剤層と光学部材との界面での光線の反射を低減させるため、屈折率の差がなるべく小さいことが望ましい。このため、前記粘着剤層の屈折率が１．４７〜１．５０であることが好ましい。   When the pressure-sensitive adhesive layer according to the present invention is used for bonding between layers of an optical member, it is desirable that the difference in refractive index is as small as possible in order to reduce the reflection of light rays at the interface between the pressure-sensitive adhesive layer and the optical member. . For this reason, it is preferable that the refractive index of the said adhesive layer is 1.47-1.50.

本発明の粘着フィルムは、本発明の粘着剤層を、基材又は離型フィルムの片面上に形成することで製造することができる。
粘着剤層の形成に用いる基材フィルムや、粘着面を保護する離型フィルム（セパレーター）としては、ポリエステルフィルムなどの樹脂フィルム等を用いることができる。
基材フィルムには、樹脂フィルムの粘着剤層が形成された側とは反対面に、シリコーン系、フッ素系の離型剤やコート剤、シリカ微粒子等による防汚処理、帯電防止剤の塗布や練り込み等による帯電防止処理を施すことができる。 The pressure-sensitive adhesive film of the present invention can be produced by forming the pressure-sensitive adhesive layer of the present invention on one side of a substrate or a release film.
As the base film used for forming the pressure-sensitive adhesive layer and the release film (separator) for protecting the pressure-sensitive adhesive surface, a resin film such as a polyester film can be used.
On the base film, on the side opposite to the side where the adhesive layer of the resin film is formed, antifouling treatment with silicone-based, fluorine-based release agent or coating agent, silica fine particles, etc., application of antistatic agent, An antistatic treatment such as kneading can be performed.

離型フィルムには、粘着剤層の粘着面と合わされる側の面に、シリコーン系、フッ素系の離型剤などにより離型処理が施される。
１つの粘着剤層の両面に、それぞれ離型フィルムの離型処理が施された面を合わせることで、「離型フィルム／粘着剤層／離型フィルム」の構成とすることもできる。この場合、両側の離型フィルムを、順次、あるいは同時に剥離して粘着面を表出することにより、光学フィルム等の光学部材と貼合可能になる。光学フィルムとしては、偏光フィルム、位相差フィルム、反射防止フィルム、防眩（アンチグレア）フィルム、紫外線吸収フィルム、赤外線吸収フィルム、光学補償フィルム、輝度向上フィルム等が挙げられる。 The release film is subjected to release treatment with a silicone-based or fluorine-based release agent or the like on the surface of the pressure-sensitive adhesive layer that is to be combined with the pressure-sensitive adhesive surface.
A structure of “release film / adhesive layer / release film” can also be obtained by combining the surfaces of the release layer with the release film subjected to the release treatment. In this case, the release films on both sides can be bonded to an optical member such as an optical film by separating the release films sequentially or simultaneously to expose the adhesive surface. Examples of the optical film include a polarizing film, a retardation film, an antireflection film, an antiglare (antiglare) film, an ultraviolet absorption film, an infrared absorption film, an optical compensation film, and a brightness enhancement film.

本発明の粘着フィルムは、偏光板を主とする液晶表示装置の周辺部材用の各種光学フィルム、タッチパネル用の各種光学フィルム、電子ペーパー用の各種光学フィルム、有機ＥＬ用の各種光学フィルム等の貼り合せに用いることができる。
また、これらの光学フィルムの少なくとも一方の面に、前記粘着剤層が積層されてなる粘着剤層付き光学フィルムとすることができる。具体的には、「光学フィルム／粘着剤層／光学フィルム」、「光学フィルム／粘着剤層／離型フィルム」、「光学フィルム／粘着剤層」、「光学フィルム／粘着剤層／光学フィルム／粘着剤層／光学フィルム」、「光学フィルム／粘着剤層／光学フィルム／粘着剤層／離型フィルム」、「離型フィルム／粘着剤層／光学フィルム／粘着剤層／離型フィルム」等の構成が挙げられる。
例えば、「光学フィルム／粘着剤層／離型フィルム」のように、離型フィルムで保護された粘着剤層を有する場合、離型フィルムを剥がして、「光学フィルム／粘着剤層」のように粘着剤層を表出させ、他の光学フィルムと貼合することにより、粘着剤層が層間の貼合に用いられた「光学フィルム／粘着剤層／光学フィルム」のような構成が得られる。 The adhesive film of the present invention is applied to various optical films for peripheral members of liquid crystal display devices mainly comprising polarizing plates, various optical films for touch panels, various optical films for electronic paper, various optical films for organic EL, etc. Can be used together.
Moreover, it can be set as the optical film with an adhesive layer formed by laminating | stacking the said adhesive layer on the at least one surface of these optical films. Specifically, “optical film / pressure-sensitive adhesive layer / optical film”, “optical film / pressure-sensitive adhesive layer / release film”, “optical film / pressure-sensitive adhesive layer”, “optical film / pressure-sensitive adhesive layer / optical film / “Adhesive layer / optical film”, “optical film / adhesive layer / optical film / adhesive layer / release film”, “release film / adhesive layer / optical film / adhesive layer / release film”, etc. A configuration is mentioned.
For example, when having a pressure-sensitive adhesive layer protected by a release film such as “optical film / pressure-sensitive adhesive layer / release film”, the release film is peeled off, and “optical film / pressure-sensitive adhesive layer” By exposing the pressure-sensitive adhesive layer and pasting with another optical film, a configuration such as “optical film / pressure-sensitive adhesive layer / optical film” in which the pressure-sensitive adhesive layer is used for bonding between layers is obtained.

以下、実施例をもって本発明を具体的に説明する。   Hereinafter, the present invention will be specifically described with reference to examples.

＜アクリル共重合体の製造＞
［実施例１］
撹拌機、温度計、還流冷却器及び窒素導入管を備えた反応装置に、窒素ガスを導入して、反応装置内の空気を窒素ガスで置換した。その後、反応装置にブチルアクリレート７０重量部、メチルアクリレート３０重量部、Ｎ−メチルピロリドン１０重量部、アクリル酸１．５重量部、６−ヒドロキシヘキシルアクリレート０．５重量部とともに溶剤（酢酸エチル）を６０重量部加えた。その後、重合開始剤としてアゾビスイソブチロニトリル０．１重量部を２時間かけて滴下させ、６５℃で６時間反応させ、重量平均分子量５０万の、実施例１に用いるアクリル共重合体溶液１を得た。アクリル共重合体の一部を採取し、後述する酸価の測定試料として用いた。
［実施例２〜６及び比較例１〜３］
モノマーの組成を各々、表１の（Ａ）、（Ｂ）、（Ｃ−１）、（Ｃ−２）の記載のようにする以外は、上記の実施例１に用いるアクリル共重合体溶液１と同様にして、実施例２〜６及び比較例１〜３に用いるアクリル共重合体溶液を得た。なお、特に測定結果を示さないが、実施例２〜６及び比較例１〜３のアクリル共重合体溶液に含まれる共重合体の重量平均分子量は、２０万〜２００万の範囲内である。 <Manufacture of acrylic copolymer>
[Example 1]
Nitrogen gas was introduced into a reactor equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen inlet tube, and the air in the reactor was replaced with nitrogen gas. Thereafter, 70 parts by weight of butyl acrylate, 30 parts by weight of methyl acrylate, 10 parts by weight of N-methylpyrrolidone, 1.5 parts by weight of acrylic acid and 0.5 parts by weight of 6-hydroxyhexyl acrylate were added to the reaction apparatus with a solvent (ethyl acetate). 60 parts by weight were added. Thereafter, 0.1 part by weight of azobisisobutyronitrile as a polymerization initiator was dropped over 2 hours and reacted at 65 ° C. for 6 hours, and the acrylic copolymer solution used in Example 1 having a weight average molecular weight of 500,000 was used. 1 was obtained. A part of the acrylic copolymer was collected and used as a sample for measuring the acid value described later.
[Examples 2-6 and Comparative Examples 1-3]
Acrylic copolymer solution 1 used in Example 1 above, except that the monomer composition is as described in (A), (B), (C-1) and (C-2) of Table 1. In the same manner, acrylic copolymer solutions used in Examples 2 to 6 and Comparative Examples 1 to 3 were obtained. In addition, although a measurement result is not shown especially, the weight average molecular weight of the copolymer contained in the acrylic copolymer solution of Examples 2-6 and Comparative Examples 1-3 is in the range of 200,000-2 million.

＜粘着剤組成物、粘着剤層及び粘着フィルムの製造＞
［実施例１］
上記のとおり製造した実施例１のアクリル共重合体溶液１に対して、コロネートＬ−４５（トリレンジイソシアネート（ＴＤＩ）化合物のアダクト体）０．３重量部を加えて撹拌混合して実施例１の粘着剤組成物を得た。この粘着剤組成物をシリコーン樹脂コートされたポリエチレンテレフタレート（ＰＥＴ）フィルムからなる剥離フィルムの上に塗布後、９０℃で乾燥することによって溶剤を除去した後、２３℃、５０％ＲＨの雰囲気下で７日間エージングすることにより、粘着剤組成物を架橋してなる粘着剤層を、剥離フィルムの片面上に有する、実施例１の粘着フィルムを得た。
［実施例２〜６及び比較例１〜３］
添加剤の組成を各々、表１の（Ｄ）の記載のようにする以外は、上記の実施例１の粘着フィルムと同様にして、実施例２〜６及び比較例１〜３の粘着フィルムを得た。 <Manufacture of an adhesive composition, an adhesive layer, and an adhesive film>
[Example 1]
Example 1 was prepared by adding 0.3 parts by weight of coronate L-45 (adduct of tolylene diisocyanate (TDI) compound) to the acrylic copolymer solution 1 of Example 1 produced as described above, and stirring and mixing. An adhesive composition was obtained. After applying this adhesive composition on a release film made of a polyethylene terephthalate (PET) film coated with a silicone resin, the solvent was removed by drying at 90 ° C., and then in an atmosphere of 23 ° C. and 50% RH. By aging for 7 days, the adhesive film of Example 1 which has the adhesive layer formed by bridge | crosslinking an adhesive composition on the single side | surface of a peeling film was obtained.
[Examples 2-6 and Comparative Examples 1-3]
The adhesive films of Examples 2 to 6 and Comparative Examples 1 to 3 are the same as the adhesive film of Example 1 except that the composition of the additive is as described in (D) of Table 1. Obtained.

Figure 2014118485
Figure 2014118485

表１では、（Ａ）群の合計を１００重量部として求めた、（Ｂ）群から（Ｄ）群までの添加割合として、重量部の数値を括弧で囲んで示す。
また、表１に用いた各成分の略記号の化合物名を、表２に示す。なお、コロネート（登録商標）Ｌ−４５は日本ポリウレタン工業株式会社の商品名であり、Ｄ−１１０Ｎは三井化学株式会社の商品名である。ＴＤＩはトリレンジイソシアネートを意味し、ＸＤＩはキシリレンジイソシアネートを意味する。 In Table 1, the numerical values of parts by weight are shown in parentheses as the ratio of addition from the group (B) to the group (D), where the total of the group (A) is 100 parts by weight.
In addition, Table 2 shows the names of the abbreviations of each component used in Table 1. Coronate (registered trademark) L-45 is a trade name of Nippon Polyurethane Industry Co., Ltd., and D-110N is a trade name of Mitsui Chemicals, Inc. TDI means tolylene diisocyanate and XDI means xylylene diisocyanate.

Figure 2014118485
Figure 2014118485

＜試験方法及び評価＞
実施例１〜６及び比較例１〜３における粘着フィルムから剥離フィルム（シリコーン樹脂コートされたＰＥＴフィルム）を剥がして、粘着剤層を表出させ、偏光板（フィルム）の片面に粘着剤層を転写した。 <Test method and evaluation>
The release film (silicone resin-coated PET film) is peeled off from the adhesive films in Examples 1 to 6 and Comparative Examples 1 to 3, the adhesive layer is exposed, and the adhesive layer is placed on one side of the polarizing plate (film). Transcribed.

＜粘着力の測定方法＞
厚さ１８０μｍの偏光板（フィルム）の片面に粘着剤層を転写して、試料となる粘着フィルム（粘着剤層付き光学フィルム）を得た。
粘着フィルムをソーダライムガラスのアセトンで洗浄した非錫面に圧着ロールで貼り合わせ、５０℃、０．５ＭＰａ×２０分間の条件でオートクレーブ処理した後、２３℃×５０％ＲＨの雰囲気下に戻し、１時間経過後の粘着フィルムの剥離強度を引張試験機によって、ＪＩＳ Ｚ０２３７「粘着テープ・粘着シート試験方法」に準拠して測定し、１８０°方向に３００ｍｍ／ｍｉｎの速度で剥離した時の剥離強度を、粘着フィルムの粘着剤層の粘着力とした。 <Measurement method of adhesive strength>
The pressure-sensitive adhesive layer was transferred to one side of a 180 μm-thick polarizing plate (film) to obtain a pressure-sensitive adhesive film (optical film with a pressure-sensitive adhesive layer) as a sample.
The pressure-sensitive adhesive film was bonded to a non-tin surface washed with acetone of soda lime glass with a pressure roll, autoclaved at 50 ° C. and 0.5 MPa × 20 minutes, then returned to an atmosphere of 23 ° C. × 50% RH, The peel strength of the adhesive film after 1 hour was measured with a tensile tester in accordance with JIS Z0237 “Testing method for adhesive tape and adhesive sheet” and peeled at a rate of 300 mm / min in the 180 ° direction. Was defined as the adhesive strength of the adhesive layer of the adhesive film.

＜密着性の試験方法＞
粘着力を測定した後の試料である粘着フィルムの粘着剤層を目視で確認し、基材層の偏光板（フィルム）からの脱落状態で密着性を判断した。
○・・基材層から粘着剤層が全く脱落していない。
△・・基材層から粘着剤層が一部浮き上がり脱落している。
×・・基材層から粘着剤層が脱落して、被着体のガラスに転着している。 <Adhesion test method>
The pressure-sensitive adhesive layer of the pressure-sensitive adhesive film, which is a sample after measuring the pressure-sensitive adhesive force, was visually confirmed, and the adhesion was judged based on the state in which the base material layer was detached from the polarizing plate (film).
○ ・ ・ No adhesive layer has fallen off from the base material layer.
Δ: Some of the pressure-sensitive adhesive layer is lifted off from the base material layer.
× ·· The pressure-sensitive adhesive layer is detached from the base material layer and transferred to the glass of the adherend.

＜耐久性の試験方法＞
粘着力の測定と同様の方法で作成した１０ｃｍ角の粘着フィルムを、同様の方法でソーダライムガラスの非錫面に貼り合わせて作成した試料を、６０℃×９０％ＲＨの雰囲気下に２５０時間放置後、２３℃×５０％ＲＨ雰囲気下に取り出し、１時間後に粘着フィルムの状態を目視で観察して耐久性を判断した。
○・・粘着フィルムの剥がれ及び発泡が全くない。
△・・粘着フィルムの一部に剥がれ及び発泡が発生している。
×・・粘着フィルムの全体に剥がれ及び発泡が発生している。 <Durability test method>
A sample prepared by laminating a 10 cm square adhesive film prepared by the same method as the measurement of the adhesive force on the non-tin surface of soda lime glass by the same method for 250 hours in an atmosphere of 60 ° C. × 90% RH. After standing, it was taken out in an atmosphere of 23 ° C. × 50% RH, and after 1 hour, the state of the adhesive film was visually observed to judge durability.
○ ・ ・ There is no peeling or foaming of the adhesive film.
Δ ·· Peeling and foaming occurred on part of the adhesive film.
× ·· Peeling and foaming occurred on the entire adhesive film.

＜屈折率の測定方法＞
２３℃の粘着剤層の屈折率を、アッベ式屈折計（メーカ名：ＥＲＭＡ、型式：ＥＲ−２Ｓ）で測定する。 <Measurement method of refractive index>
The refractive index of the pressure-sensitive adhesive layer at 23 ° C. is measured with an Abbe refractometer (manufacturer name: ERMA, model: ER-2S).

表３に、評価結果を示す。   Table 3 shows the evaluation results.

Figure 2014118485
Figure 2014118485

実施例１〜６の粘着フィルムは、厚さ５μｍの粘着剤層の粘着力が４．０Ｎ／２５ｍｍ以上であり、粘着剤層の屈折率が１．４７〜１．５０の範囲内であり、密着性、及び耐久性にも優れていた。すなわち、実施例１〜６の粘着フィルムでは、要求事項および問題を克服することができた。
表４に、実施例１，３の粘着剤組成物を用いて、同様の方法で製造した、厚さ３μｍ、５μｍ、１０μｍ、１５μｍ、２０μｍの粘着剤層の粘着フィルムについて、粘着力を測定した結果を示す。実施例１，３の粘着剤組成物を用いた粘着剤層の粘着力は、一般に知られているように、粘着剤層の厚さに略比例していることが分かる。 In the adhesive films of Examples 1 to 6, the adhesive force of the 5 μm thick adhesive layer is 4.0 N / 25 mm or more, and the refractive index of the adhesive layer is in the range of 1.47 to 1.50, It was excellent in adhesion and durability. That is, the requirements and problems could be overcome with the adhesive films of Examples 1-6.
Table 4 shows the pressure-sensitive adhesive strength of the pressure-sensitive adhesive layers having a thickness of 3 μm, 5 μm, 10 μm, 15 μm, and 20 μm manufactured in the same manner using the pressure-sensitive adhesive compositions of Examples 1 and 3. Results are shown. It turns out that the adhesive force of the adhesive layer using the adhesive composition of Examples 1 and 3 is substantially proportional to the thickness of the adhesive layer, as is generally known.

Figure 2014118485
Figure 2014118485

比較例１の粘着フィルムは、粘着剤組成物に窒素含有モノマーを含まないためか、厚さ５μｍの粘着剤層の粘着力が弱い。また、粘着剤層の屈折率が低く、密着性、及び耐久性にも劣っていた。
比較例２の粘着フィルムは、粘着剤組成物にカルボキシル基を含有する共重合性ビニルモノマーの配合量が多すぎるためか、厚さ５μｍの粘着剤層の粘着力が弱い。また、粘着剤層の屈折率が低く、密着性、及び耐久性にも、やや劣っていた。
比較例３の粘着フィルムは、粘着剤組成物にカルボキシル基を含有する共重合性ビニルモノマーもヒドロキシル基を含有する共重合性ビニルモノマーも含まないためか、厚さ５μｍの粘着剤層の粘着力が弱い。また、粘着剤層の屈折率が低く、密着性、及び耐久性にも劣っていた。
このように、比較例１〜３の粘着フィルムでは、従来の要求事項および問題を克服することができなかった。 The pressure-sensitive adhesive film of Comparative Example 1 is weak in the pressure-sensitive adhesive layer having a thickness of 5 μm because the pressure-sensitive adhesive composition does not contain a nitrogen-containing monomer. Moreover, the refractive index of the adhesive layer was low, and it was inferior to adhesiveness and durability.
In the pressure-sensitive adhesive film of Comparative Example 2, the pressure-sensitive adhesive strength of the pressure-sensitive adhesive layer having a thickness of 5 μm is weak because the amount of the copolymerizable vinyl monomer containing a carboxyl group in the pressure-sensitive adhesive composition is too large. Moreover, the refractive index of the pressure-sensitive adhesive layer was low, and the adhesion and durability were slightly inferior.
The pressure-sensitive adhesive film of Comparative Example 3 is because the pressure-sensitive adhesive composition contains neither a copolymerizable vinyl monomer containing a carboxyl group nor a copolymerizable vinyl monomer containing a hydroxyl group in the pressure-sensitive adhesive composition. Is weak. Moreover, the refractive index of the adhesive layer was low, and it was inferior to adhesiveness and durability.
As described above, the adhesive films of Comparative Examples 1 to 3 could not overcome the conventional requirements and problems.

Claims (12)

アクリル系ポリマーからなる粘着剤組成物を架橋してなる粘着剤層において、前記粘着剤組成物が、主成分の（メタ）アクリレートモノマーとして、アルキル基の炭素数がＣ１〜Ｃ１４のアルキル（メタ）アクリレートモノマーの少なくとも１種以上を含有し、他の共重合性モノマーとして、窒素含有ビニルモノマーの少なくとも１種以上と、カルボキシル基を含有する共重合性ビニルモノマー及び／又はヒドロキシル基を含有する共重合性ビニルモノマーの少なくとも１種以上と、を含有し、前記粘着剤層の厚さが１μｍ〜２０μｍであり、厚さが５μｍの時の粘着力が４．０（Ｎ／２５ｍｍ）以上であることを特徴とする粘着剤層。   In the pressure-sensitive adhesive layer formed by crosslinking a pressure-sensitive adhesive composition comprising an acrylic polymer, the pressure-sensitive adhesive composition is an alkyl (meth) having a C1-C14 alkyl group as the main component (meth) acrylate monomer. Copolymer containing at least one acrylate monomer and at least one nitrogen-containing vinyl monomer, a copolymerizable vinyl monomer containing a carboxyl group and / or a hydroxyl group as another copolymerizable monomer At least one kind of a vinyl monomer, the thickness of the pressure-sensitive adhesive layer is 1 μm to 20 μm, and the adhesive strength when the thickness is 5 μm is 4.0 (N / 25 mm) or more. A pressure-sensitive adhesive layer. 前記粘着剤組成物が、（Ａ）アルキル基の炭素数がＣ１〜Ｃ１４のアルキル（メタ）アクリレートモノマーの少なくとも１種以上を合せた主成分の（メタ）アクリレートモノマー１００重量部に対して、（Ｂ）窒素含有ビニルモノマーの１種以上を５〜５０重量部と、（Ｃ）カルボキシル基を含有する共重合性ビニルモノマー及び／又はヒドロキシル基を含有する共重合性ビニルモノマーの少なくとも１種以上を０．１〜５重量部と、を含有する重量平均分子量２０万〜２００万の共重合体、及び（Ｄ）架橋剤を０．０１〜５重量部を、含有することを特徴とする請求項１に記載の粘着剤層。   The pressure-sensitive adhesive composition comprises (A) 100 parts by weight of (meth) acrylate monomer as a main component, which is a combination of at least one alkyl (meth) acrylate monomer having an alkyl group with C1-C14 carbon atoms. B) 5 to 50 parts by weight of one or more kinds of nitrogen-containing vinyl monomers, and (C) at least one kind of copolymerizable vinyl monomers containing carboxyl groups and / or copolymerizable vinyl monomers containing hydroxyl groups. It contains 0.1 to 5 parts by weight of a copolymer having a weight average molecular weight of 200,000 to 2,000,000, and (D) a crosslinking agent in an amount of 0.01 to 5 parts by weight. The pressure-sensitive adhesive layer according to 1. 前記粘着剤組成物が、前記主成分の（メタ）アクリレートモノマー１００重量部の内、メチルアクリレートのモノマーを２０重量部以上の割合で含有することを特徴とする請求項１又は２に記載の粘着剤層。   The pressure-sensitive adhesive composition according to claim 1 or 2, wherein the pressure-sensitive adhesive composition contains 20 parts by weight or more of methyl acrylate monomer in 100 parts by weight of the (meth) acrylate monomer as the main component. Agent layer. 前記粘着剤組成物が、前記主成分の（メタ）アクリレートモノマー１００重量部に対して、カルボキシル基を含有する共重合性ビニルモノマーの１種以上を２．０重量部以下、及び／又は、ヒドロキシル基を含有する共重合性ビニルモノマーの１種以上を５．０重量部以下の割合で含有することを特徴とする請求項１〜３のいずれかに記載の粘着剤層。   The pressure-sensitive adhesive composition comprises 2.0 parts by weight or less of a copolymerizable vinyl monomer containing a carboxyl group and / or hydroxyl based on 100 parts by weight of the (meth) acrylate monomer as the main component. The pressure-sensitive adhesive layer according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive layer contains at least one type of copolymerizable vinyl monomer containing a group in a proportion of 5.0 parts by weight or less. 前記粘着剤層の屈折率が１．４７〜１．５０であることを特徴とする請求項１〜４のいずれかに記載の粘着剤層。   The pressure-sensitive adhesive layer according to any one of claims 1 to 4, wherein the pressure-sensitive adhesive layer has a refractive index of 1.47 to 1.50. 請求項１〜５のいずれかに記載の粘着剤層が、離型フィルムの片面に形成されてなり、離型フィルム／粘着剤層／離型フィルムの構成であることを特徴とする粘着フィルム。   The pressure-sensitive adhesive film according to any one of claims 1 to 5, wherein the pressure-sensitive adhesive layer is formed on one side of a release film, and has a structure of release film / pressure-sensitive adhesive layer / release film. 基材の片面上に、請求項１〜５のいずれかに記載の粘着剤層が積層されてなることを特徴とする粘着フィルム。   An adhesive film comprising the adhesive layer according to any one of claims 1 to 5 laminated on one side of a substrate. 請求項６又は７に記載の粘着フィルムが用いられた、偏光板の周辺部材用フィルム。   The film for peripheral members of a polarizing plate in which the adhesive film according to claim 6 or 7 is used. 請求項６又は７に記載の粘着フィルムが用いられた、タッチパネル用フィルム。   The film for touchscreens in which the adhesive film of Claim 6 or 7 was used. 請求項６又は７に記載の粘着フィルムが用いられた、電子ペーパー用フィルム。   The film for electronic paper in which the adhesive film of Claim 6 or 7 was used. 請求項６又は７に記載の粘着フィルムが用いられた、有機ＥＬ用フィルム。   The film for organic EL in which the adhesive film of Claim 6 or 7 was used. 光学フィルムの少なくとも一方の面に、請求項１〜５のいずれかに記載の粘着剤層が積層されてなる粘着剤層付き光学フィルム。   The optical film with an adhesive layer formed by laminating | stacking the adhesive layer in any one of Claims 1-5 on the at least one surface of an optical film.
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