JP5361760B2 - Protective film - Google Patents

Protective film Download PDF

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JP5361760B2
JP5361760B2 JP2010030361A JP2010030361A JP5361760B2 JP 5361760 B2 JP5361760 B2 JP 5361760B2 JP 2010030361 A JP2010030361 A JP 2010030361A JP 2010030361 A JP2010030361 A JP 2010030361A JP 5361760 B2 JP5361760 B2 JP 5361760B2
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sensitive adhesive
pressure
meth
adhesive layer
parts
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JP2010180405A (en
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剛 井上
和人 奥村
寛 矢田
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Nitto Denko Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective film which can protect a metal layer and a metal oxide layer used, for example, in an electromagnetic wave shield to keep them in a contamination-free and favorable situation. <P>SOLUTION: The protective film includes a base material and an adhesive agent layer thereon, wherein the surface of the adhesive agent layer has a contact angle &theta;<SB>1</SB>of 70&deg; or lower as measured immediately after contacted with methylene iodide and a contact angle variation rate &Delta;&theta; of 8% or lower as measured 30 sec after contacted with methylene iodide. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、電磁波シールド材料等に使用されている金属層又は金属酸化物層に対し、汚染などがなく良好な状態を維持できる保護フィルムに関する。   The present invention relates to a protective film capable of maintaining a good state without contamination or the like with respect to a metal layer or metal oxide layer used in an electromagnetic wave shielding material or the like.

プラズマディスプレイパネル(PDP)やCRTなどにおいて、電磁波シールド技術は、電磁気的なノイズ妨害を防止する上で非常に重要である。これらの電磁波シールドの材料としては、金、銀などの金属やITOなどの金属酸化物を用いて、蒸着などにより薄膜導電層を形成したり、メッシュパターンを形成する方法などがある。これらの金属層または金属酸化物層については、使用されるまでの間、保護フィルムで保護されているのが一般的である。   In a plasma display panel (PDP), a CRT, and the like, electromagnetic wave shielding technology is very important for preventing electromagnetic noise interference. As a material for these electromagnetic wave shields, there are a method in which a thin film conductive layer is formed by vapor deposition using a metal such as gold or silver or a metal oxide such as ITO, or a mesh pattern is formed. These metal layers or metal oxide layers are generally protected with a protective film until they are used.

しかしながら、一般的な保護フィルムを用いた場合、特にこれらの金属層または金属酸化物層の表面が活性であるためか、これらの表面に汚染が発生しやすく、その結果、電磁波シールドとしての機能を損なう場合があった。   However, when a general protective film is used, the surface of these metal layers or metal oxide layers is particularly active, and contamination is likely to occur on these surfaces. There was a case to lose.

そこで、本発明の目的は、電磁波シールド等に使用されている金属層および金属酸化物層について、汚染などがなく良好な状態を維持できる保護フィルムを提供することにある。   Then, the objective of this invention is providing the protective film which can maintain a favorable state without contamination etc. about the metal layer and metal oxide layer which are used for the electromagnetic wave shield etc.

本発明者は鋭意研究する中で、金属層または金属酸化物層の表面に発生する汚染について、粘着剤層の表面の影響が大きいことを見出した。具体的には、粘着剤層表面のヨウ化メチレンに対する接触直後の接触角:θ が70°以下、好ましくは50〜70°であり、さらにはヨウ化メチレンに対する接触角変化率:Δθが8%以下、好ましくは6%以下である粘着剤層を基材に設けた保護フィルムを用いることにより、金属層または金属酸化物層の表面への汚染を防止し良好な状態を維持できることを見出し、本発明に至った。 The inventor has intensively studied and found that the surface of the pressure-sensitive adhesive layer has a great influence on the contamination generated on the surface of the metal layer or metal oxide layer. Specifically, the contact angle immediately after contact with methylene iodide on the surface of the pressure-sensitive adhesive layer: θ 1 is 70 ° or less, preferably 50 to 70 °, and the contact angle change rate with respect to methylene iodide: Δθ is 8 % Or less, preferably by using a protective film provided with a pressure-sensitive adhesive layer of 6% or less on a base material, it is found that the surface of the metal layer or metal oxide layer can be prevented from being contaminated and maintained in a good state, The present invention has been reached.

即ち、本発明の保護フィルムは、基材上に粘着剤層を備え、その粘着剤層の表面のヨウ化メチレンに対する接触直後の接触角:θ が70°以下であり、ヨウ化メチレンに対する接触角の30秒後の変化率:Δθが8%以下であることを特徴とする。 That is, the protective film of the present invention includes a pressure-sensitive adhesive layer on a base material, the contact angle immediately after contact with methylene iodide on the surface of the pressure-sensitive adhesive layer: θ 1 is 70 ° or less, and contact with methylene iodide. Change rate after 30 seconds of angle: Δθ is 8% or less.

ここで接触角変化率:Δθについては、以下の式で求められる。なお、接触角は市販の接触角測定装置を用いて、θ/2法に準拠して23℃で測定する値である。   Here, the contact angle change rate: Δθ is obtained by the following equation. In addition, a contact angle is a value measured at 23 degreeC based on (theta) / 2 method using a commercially available contact angle measuring apparatus.

Δθ=|θ −θ |×100/θ
Δθ:接触角変化率(%)、θ :接触直後のヨウ化メチレン接触角(°)
θ :接触後30秒後のヨウ化メチレン接触角(°)
このθ が70°を超え、またはΔθが8%を超える場合には、金属層または金属酸化物層の表面と結びつきが強くなるためか、汚染が発生しやすくなる。
Δθ = | θ 1 −θ 2 | × 100 / θ 1
Δθ: Contact angle change rate (%), θ 1 : Methylene iodide contact angle immediately after contact (°)
θ 2 : Methylene iodide contact angle (°) 30 seconds after contact
The theta 1 is greater than 70 °, or when Δθ exceeds 8%, probably because the ties between the surface of the metal layer or metal oxide layer is increased, contamination is likely to occur.

上記において、前記粘着剤層の主ポリマーが(メタ)アクリル系ポリマーであることが好ましい。本発明の保護フィルムは、電磁波シールド材料の表面保護に使用されるのが好ましい。   In the above, it is preferable that the main polymer of the pressure-sensitive adhesive layer is a (meth) acrylic polymer. The protective film of the present invention is preferably used for surface protection of an electromagnetic wave shielding material.

本発明の保護フィルムは、基材上に粘着剤層を備えるものであるが、両層の間にはプライマー層などの中間層を有していてもよい。粘着剤層の材質は、上記の接触角と変化率とを満たすものであれば何れの材質でもよい。つまり、本発明の保護フィルムの粘着剤層の表面のヨウ化メチレンに対する接触直後の接触角:θ が70°以下、好ましくは50〜70°であり、さらにはヨウ化メチレンに対する接触角変化率:Δθが8%以下、好ましくは6%以下である。 The protective film of the present invention includes an adhesive layer on a substrate, but may have an intermediate layer such as a primer layer between both layers. The material of the pressure-sensitive adhesive layer may be any material as long as it satisfies the above contact angle and change rate. That is, the contact angle immediately after contact with methylene iodide on the surface of the pressure-sensitive adhesive layer of the protective film of the present invention: θ 1 is 70 ° or less, preferably 50 to 70 °, and further the contact angle change rate with respect to methylene iodide. : Δθ is 8% or less, preferably 6% or less.

粘着剤層の主ポリマーとしては、接着性と剥離性のバランスを得るという点から、(メタ)アクリル系ポリマーが良好である。ここで用いられる(メタ)アクリル系ポリマーについては、炭素数が1〜18までのアルキル基を有する(メタ)アクリル酸エステルなどのモノマーや共重合性改質モノマーを1種または2種以上を溶液重合、乳化重合など適宜の方式で単独重合または共重合したものである。   As the main polymer of the pressure-sensitive adhesive layer, a (meth) acrylic polymer is preferable from the viewpoint of obtaining a balance between adhesiveness and peelability. As for the (meth) acrylic polymer used here, a monomer or a copolymerizable modifying monomer such as a (meth) acrylic acid ester having an alkyl group having 1 to 18 carbon atoms is used as a solution. It is homopolymerized or copolymerized by an appropriate method such as polymerization or emulsion polymerization.

なお前記した(メタ)アクリル酸エステルや共重合性改質モノマーの具体例としては、ブチル基や2−エチルヘキシル基、イソオクチル基やイソノニル基、エチル基やメチル基等のアルキル基を有する(メタ)アクリル酸のエステル、(メタ)アクリロニトリル、酢酸ビニルやスチレン、(メタ)アクリル酸、無水マレイン酸やビニルピロリドン、グリシジル基やジメチルアミノエチル基やヒドロキシル基を有する(メタ)アクリル酸エステル、(メタ)アクリルアミド、ビニルアミンやアリルアミン、エチレンイミンなどの改質モノマーなどがあげられる。   Specific examples of the above-mentioned (meth) acrylic acid ester and copolymerizable modifying monomer include alkyl groups such as butyl group, 2-ethylhexyl group, isooctyl group, isononyl group, ethyl group and methyl group (meth). Esters of acrylic acid, (meth) acrylonitrile, vinyl acetate and styrene, (meth) acrylic acid, maleic anhydride and vinylpyrrolidone, (meth) acrylic acid ester having glycidyl group, dimethylaminoethyl group and hydroxyl group, (meth) Examples thereof include modifying monomers such as acrylamide, vinylamine, allylamine, and ethyleneimine.

上記(メタ)アクリル系ポリマーについては、そのまま粘着剤のベースポリマーとして用いることもできるが、通常は粘着剤の凝集力を向上させる目的で架橋剤を配合して用いる。アクリル系ポリマーの架橋構造化は、アクリル系ポリマーを合成する際に内部架橋剤として多官能(メタ)アクリレートなどを添加するか、あるいはアクリル系ポリマーを合成した後に外部架橋剤として多官能のエポキシ系化合物やイソシアネート系化合物などを添加することにより実施できる。その他、放射線照射による架橋処理を施してもよい。これらの中でも、架橋構造を形成する好ましい方法は、外部架橋剤として多官能性エポキシ化合物や多官能性イソシアネート化合物を配合する方法である。   About the said (meth) acrylic-type polymer, although it can also be used as a base polymer of an adhesive, it is normally mix | blended and used for the purpose of improving the cohesive force of an adhesive. Crosslinking structuring of acrylic polymer can be achieved by adding polyfunctional (meth) acrylate as an internal cross-linking agent when synthesizing acrylic polymer, or polyfunctional epoxy type as external cross-linking agent after synthesizing acrylic polymer It can be carried out by adding a compound or an isocyanate compound. In addition, you may give the crosslinking process by radiation irradiation. Among these, a preferable method for forming a crosslinked structure is a method of blending a polyfunctional epoxy compound or a polyfunctional isocyanate compound as an external crosslinking agent.

ここでいう多官能性とは2官能性以上を意味する。多官能性エポキシ化合物には、分子中に2個以上のエポキシ基を有する種々の化合物が含まれ、その代表的な例として、例えば、ソルビトールテトラグリシジルエーテル、トリメチロールプロパングリシジルエーテル、テトラグリシジル−1 ,3−ビスアミノメチルシクロヘキサン、テトラグリシジル−m−キシレンジアミン、トリグリシジル−p−アミノフエノールなどがある。また、多官能イソシアネート化合物には、分子中に2個以上のイソシアネート基を有する種々の化合物が含まれ、その代表的な例として、例えば、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、ヘキサメチレンジイソシアネートなどが挙げられる。   The polyfunctionality here means two or more functionalities. The polyfunctional epoxy compound includes various compounds having two or more epoxy groups in the molecule. Typical examples thereof include sorbitol tetraglycidyl ether, trimethylolpropane glycidyl ether, tetraglycidyl-1 , 3-bisaminomethylcyclohexane, tetraglycidyl-m-xylenediamine, triglycidyl-p-aminophenol and the like. The polyfunctional isocyanate compound includes various compounds having two or more isocyanate groups in the molecule, and typical examples thereof include diphenylmethane diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate, and the like. .

これらの架橋剤は単独で又は2種以上を組み合わせて使用でき、その使用量は、(メタ)アクリル系ポリマーの組成や分子量などに応じて適宜選択できる。その際、反応を保進させるために、粘着剤に通常用いられるジブチルスズラウレートなどの架橋触媒を加えるようにしてもよい。また、粘着剤には、必要に応じて慣用の添加剤を配合してもよい。   These cross-linking agents can be used alone or in combination of two or more, and the amount used can be appropriately selected according to the composition and molecular weight of the (meth) acrylic polymer. At that time, in order to promote the reaction, a crosslinking catalyst such as dibutyltin laurate which is usually used for the pressure-sensitive adhesive may be added. Moreover, you may mix | blend a conventional additive with an adhesive as needed.

粘着剤層の形成に際しては、極力添加剤を配合することは避ける方が好ましいが、粘着特性の制御等を目的に必要に応じて例えば軟化剤やシリコーン系ポリマー、アクリル系共重合体、粘着付与剤や老化防止剤やヒンダードアミン系光安定剤、紫外線吸収剤その他例えば酸化カルシウムや酸化マグネシウム、シリカや酸化亜鉛、酸化チタンの如き充填剤や顔料などの適宜な添加剤を配合することができる。ただしこのような添加剤については、被着体へのダメージがないものが好ましい。   In forming the pressure-sensitive adhesive layer, it is preferable to avoid adding additives as much as possible. However, for the purpose of controlling the pressure-sensitive adhesive properties, for example, softeners, silicone-based polymers, acrylic copolymers, tackifying An appropriate additive such as an agent, an antioxidant, a hindered amine light stabilizer, an ultraviolet absorber, and other fillers and pigments such as calcium oxide, magnesium oxide, silica, zinc oxide, and titanium oxide can be blended. However, such additives are preferably those which do not damage the adherend.

本発明において、接触角とその変化率に関する前述の条件を満たすようにするには、接触角を低減するには、(メタ)アクリル系ポリマー中に側鎖が短いアクリルモノマーの配合部数を物性を損なわない程度に極力減らす方が好ましく、接触角の変化率を低減するには、低分子可塑剤などの添加剤を極力少なくするのが好ましい。   In the present invention, in order to satisfy the above-mentioned conditions concerning the contact angle and the rate of change, the contact angle can be reduced by reducing the number of blended parts of the acrylic monomer having a short side chain in the (meth) acrylic polymer. It is preferable to reduce as much as possible without impairing, and in order to reduce the rate of change of the contact angle, it is preferable to reduce the additive such as a low molecular plasticizer as much as possible.

基材としては、ポリエチレンやポリプロピレンなどポリオレフィン系の単独または混合物、ナイロン、PET、ポリイミド、ポリカーボネート、PTFE等の熱可塑性フィルムが好適であり、さらには透明性やフィッシュアイ等の点よりPETフィルムが好ましい。その厚みは、5〜200μm、好ましくは20〜100μmが一般的であるが、これに限定されない。   The substrate is preferably a polyolefin film such as polyethylene or polypropylene, or a thermoplastic film such as nylon, PET, polyimide, polycarbonate, or PTFE, and more preferably a PET film from the viewpoint of transparency and fish eyes. . The thickness is generally 5 to 200 μm, preferably 20 to 100 μm, but is not limited thereto.

保護フィルムおよびシートの形成は例えば、粘着剤層形成材の溶剤による溶液や熱溶融液を基材に塗布する方法や、それに準じセパレータ上に塗布形成した粘着剤層を基材に移着する方法、粘着剤層形成材を基材上に押出成形塗布する方法、支持基村上に粘着剤層をラミネートする方法などの、公知の接着シートの形成方法に準じて行うことができる。形成する粘着剤の厚さは適宜に決定すればよく、一般には100μm以下、就中1〜50μm、特に1〜40μmが好ましい。粘着剤は必要に応じて、実用に供されるまでの間、セパレータなどを仮着して保護される。   For example, the protective film and the sheet can be formed by, for example, a method of applying a solution of a pressure-sensitive adhesive layer forming material or a hot melt to the base material, or a method of transferring the pressure-sensitive adhesive layer formed on the separator to the base material. Further, it can be carried out according to a known method for forming an adhesive sheet, such as a method of extrusion-coating a pressure-sensitive adhesive layer-forming material on a substrate, or a method of laminating a pressure-sensitive adhesive layer on a supporting base village. What is necessary is just to determine the thickness of the adhesive to form suitably, Generally 100 micrometers or less, 1-50 micrometers especially, 1-40 micrometers is especially preferable. The pressure-sensitive adhesive is protected by temporarily attaching a separator or the like until it is practically used.

本発明の保護フィルムは、電磁波シールド材料、透明導電性フィルム、金属蒸着シートなどの金属層又は金属酸化物層に対して表面を保護する目的で使用される。特に、電磁波シールド材料の表面保護に使用されるのが好ましい。   The protective film of the present invention is used for the purpose of protecting the surface of a metal layer or metal oxide layer such as an electromagnetic shielding material, a transparent conductive film, and a metal vapor-deposited sheet. In particular, it is preferably used for surface protection of an electromagnetic wave shielding material.

以下、本発明の構成と効果を具体的に示す実施例等について説明する。   Examples and the like specifically showing the configuration and effects of the present invention will be described below.

実施例1
常用の方法を用いて、アクリル酸2−エチルヘキシル(70部(重量部、以下同じ))、N−アクリロイルモルホリン(30部)、アクリル酸(3部)からなるアクリル系ポリマーの20%トルエン溶液を準備した。そこにアクリル系ポリマー100部に対して、エポキシ系架橋剤(テトラッドC、三菱瓦斯化学製)を2 部、イソシアネート系架橋剤(コロネートL、日本ポリウレタン製)を2部配合し、38μmのPETフィルムに乾燥後の糊厚:5μmとなるように塗布して乾燥し、θ :56.5°、Δθ:1.7%の保護フィルムを得た。
Example 1
Using a conventional method, a 20% toluene solution of an acrylic polymer composed of 2-ethylhexyl acrylate (70 parts by weight, the same applies hereinafter), N-acryloylmorpholine (30 parts), and acrylic acid (3 parts) was prepared. Got ready. Thereto, 2 parts of an epoxy crosslinking agent (Tetrad C, manufactured by Mitsubishi Gas Chemical) and 2 parts of an isocyanate crosslinking agent (Coronate L, manufactured by Nippon Polyurethane) are blended with 100 parts of an acrylic polymer, and a 38 μm PET film. The thickness of the paste after drying was applied to be 5 μm and dried to obtain a protective film of θ 1 : 56.5 ° and Δθ: 1.7%.

実施例2
常用の方法を用いて、アクリル酸2−エチルヘキシル(55部)、酢酸ビニル(45部)、アクリル酸(3部)からなるアクリル系ポリマーの20%トルエン溶液を準備した。そこにアクリル系ポリマー100部に対して、エポキシ系架橋剤(テトラッドC、三菱瓦斯化学製)を2部配合し、38μmのPETフィルムに乾燥後の糊厚:5μmとなるように塗布して乾燥し、θ :58.3°、Δθ:1.2%の保護フィルムを得た。
Example 2
Using a conventional method, a 20% toluene solution of an acrylic polymer composed of 2-ethylhexyl acrylate (55 parts), vinyl acetate (45 parts), and acrylic acid (3 parts) was prepared. 2 parts of an epoxy crosslinking agent (Tetrad C, manufactured by Mitsubishi Gas Chemical Co., Ltd.) is blended with 100 parts of an acrylic polymer, applied to a 38 μm PET film so that the paste thickness after drying is 5 μm, and then dried. Thus, a protective film having θ 1 : 58.3 ° and Δθ: 1.2% was obtained.

実施例3
常用の方法を用いて、アクリル酸2−エチルヘキシル(100部)、アクリル酸ヒドロキシエチル(4部)からなるアクリル系ポリマーの20%トルエン溶液を準備した。そこにアクリル系ポリマー100部に対して、イソシアネート系架橋剤(コロネートL、日本ポリウレタン製)を3 .5 部、反応触媒(OL−1、東京ファインケミカル製)0.05部配合し、38μmのPETフィルムに乾燥後の糊厚:20μmとなるように塗布して乾燥し、θ :62.8°、Δθ:3.9%の保護フィルムを得た。
Example 3
Using a conventional method, a 20% toluene solution of an acrylic polymer composed of 2-ethylhexyl acrylate (100 parts) and hydroxyethyl acrylate (4 parts) was prepared. 2. An isocyanate-based crosslinking agent (Coronate L, manufactured by Nippon Polyurethane) is added to 100 parts of the acrylic polymer. 5 parts, 0.05 part of a reaction catalyst (OL-1, manufactured by Tokyo Fine Chemicals) was blended, applied to a 38 μm PET film so that the paste thickness after drying was 20 μm, and dried, θ 1 : 62.8 ° , Δθ: A protective film of 3.9% was obtained.

実施例4
常用の方法を用いて、アクリル酸2−エチルヘキシル(50部)、メタクリル酸ブチル(50部)、アクリル酸(0.5部)、アクリル酸ヒドロキシエチル(2部)からなるアクリル系ポリマーの20%トルエン溶液を準備した。そこにアクリル系ポリマー100部に対して、イソシアネート系架橋剤(コロネートL、日本ポリウレタン製)を3部、反応触媒(OL−1、東京ファインケミカル製)0.1部配合し、38μmのPETフィルムに乾燥後の糊厚:5μmとなるように塗布して乾燥し、θ :59.1°、Δθ:5.1%の保護フィルムを得た。
Example 4
20% of an acrylic polymer consisting of 2-ethylhexyl acrylate (50 parts), butyl methacrylate (50 parts), acrylic acid (0.5 parts), hydroxyethyl acrylate (2 parts) using conventional methods A toluene solution was prepared. 3 parts of an isocyanate-based crosslinking agent (Coronate L, manufactured by Nippon Polyurethane) and 0.1 part of a reaction catalyst (OL-1, manufactured by Tokyo Fine Chemical Co., Ltd.) are blended with 100 parts of an acrylic polymer to form a 38 μm PET film. The paste thickness after drying: 5 μm was applied and dried to obtain a protective film of θ 1 : 59.1 ° and Δθ: 5.1%.

比較例1
常用の方法を用いて、アクリル酸2−エチルヘキシル(50部)、アクリル酸メチル(50部)、アクリル酸(2部)からなるアクリル系ポリマーの20%トルエン溶液を準備した。そこにアクリル系ポリマー100部に対して、イソシアネート系架橋剤(コロネートL、日本ポリウレタン製)を3.5部、反応触媒(OL−1、東京ファインケミカル製)0.05部配合、可塑剤(アジピン酸ジブトキシエトキシエチル)15部配合し、38μmのPETフィルムに乾燥後の糊厚:20μmとなるように塗布して乾燥し、θ :72.9°、Δθ:10.0%の保護フィルムを得た。
Comparative Example 1
Using a conventional method, a 20% toluene solution of an acrylic polymer composed of 2-ethylhexyl acrylate (50 parts), methyl acrylate (50 parts), and acrylic acid (2 parts) was prepared. There are 3.5 parts of an isocyanate crosslinking agent (Coronate L, manufactured by Nippon Polyurethane), 0.05 parts of a reaction catalyst (OL-1, manufactured by Tokyo Fine Chemical), and a plasticizer (adipine) with respect to 100 parts of an acrylic polymer. 15 parts of dibutoxyethoxyethyl acid), applied to a 38 μm PET film so that the paste thickness after drying is 20 μm, and dried, θ 1 : 72.9 °, Δθ: 10.0% protective film Got.

比較例2
比較例1において、可塑剤を使用しないこと以外は同様にして、θ :73.5°、Δθ:3.8%の保護フィルムを得た。
Comparative Example 2
In Comparative Example 1, a protective film of θ 1 : 73.5 ° and Δθ: 3.8% was obtained in the same manner except that no plasticizer was used.

比較例3
実施例3において、可塑剤(アジピン酸ジブトキシエトキシエチル)15部を配合したこと以外は、実施例3と同様にして、θ :61.5°、Δθ:8.8%の保護フィルムを得た。
Comparative Example 3
In Example 3, except that 15 parts of a plasticizer (dibutoxyethoxyethyl adipate) was blended, a protective film of θ 1 : 61.5 ° and Δθ: 8.8% was obtained in the same manner as in Example 3. Obtained.

なお、これらの実施例と比較例で得られた保護フィルムは、40℃で3日間エージング処理を行った。   In addition, the protective film obtained by these Examples and the comparative example performed the aging process for 3 days at 40 degreeC.

評価方法
実施例、比較例で得られた保護フィルムを、ITOフィルムのITO面に線圧:78N/cmでラミネータ圧着することにより貼付し、80℃で72時間放置する。その後、保護フィルムを剥離し、グリーンランプにかざすことによって汚染の有無を目視にて確認した。その評価結果を下表に示す。
Evaluation Method The protective films obtained in Examples and Comparative Examples are attached to the ITO surface of the ITO film by pressure bonding with a laminator at a linear pressure of 78 N / cm, and left at 80 ° C. for 72 hours. Thereafter, the protective film was peeled off and held over a green lamp to visually check for contamination. The evaluation results are shown in the table below.

Figure 0005361760

Figure 0005361760

表1〜表2の結果より、実施例については、汚染発生がなく非常に良好であるのに対し、比較例については、汚染が認められることが判る。
Figure 0005361760

Figure 0005361760

From the results of Tables 1 and 2, it can be seen that the examples are very good with no occurrence of contamination, whereas the comparative examples show contamination.

Claims (4)

基材上に粘着剤層を備え、粘着剤層の主ポリマーが(メタ)アクリル系ポリマーであり、
前記(メタ)アクリル系ポリマーを構成する全モノマー103重量部に対して、アクリル酸2−エチルへキシルを55重量部以上含有し、
前記粘着剤層が、少なくともエポキシ系化合物により、架橋構造を形成したものであり、
その粘着剤層の表面のヨウ化メチレンに対する接触直後の接触角:θが50〜58.3°であり、
ヨウ化メチレンに対する接触角の30秒後の変化率:Δθが1.2〜1.7%である透明導電フィルム用の保護剥離用フィルム。
Provided with a pressure-sensitive adhesive layer on the substrate, the main polymer of the pressure-sensitive adhesive layer is a (meth) acrylic polymer,
Containing 55 parts by weight or more of 2-ethylhexyl acrylate with respect to 103 parts by weight of all monomers constituting the (meth) acrylic polymer,
The pressure-sensitive adhesive layer has a crosslinked structure formed by at least an epoxy compound,
Contact angle immediately after contact of the surface of the pressure-sensitive adhesive layer with methylene iodide: θ 1 is 50 to 58.3 °,
Change rate after 30 seconds of contact angle with respect to methylene iodide: A film for protective peeling for a transparent conductive film having a Δθ of 1.2 to 1.7 %.
前記(メタ)アクリル系ポリマーが、前記アクリル酸2−エチルへキシルに加えて、更に、炭素数が1〜18までのアルキル基を有する(メタ)アクリル酸エステルモノマー及び/又は共重合性改質モノマーを、溶液重合又は乳化重合することにより得られたものであることを特徴とする請求項1に記載の透明導電フィルム用の保護剥離用フィルム。 In addition to the 2-ethylhexyl acrylate , the (meth) acrylic polymer further has a (meth) acrylic acid ester monomer and / or copolymerizable modification having an alkyl group having 1 to 18 carbon atoms. The protective release film for a transparent conductive film according to claim 1, wherein the monomer is obtained by solution polymerization or emulsion polymerization of a monomer. 前記粘着剤層が、前記エポキシ系化合物に加えて、更に、多官能(メタ)アクリレート、及び/又は、イソシアネート系化合物により、架橋構造を形成したものであることを特徴とする請求項1又2に記載の透明導電フィルム用の保護剥離用フィルム。 The pressure-sensitive adhesive layer, in addition to the epoxy compound, further, polyfunctional (meth) acrylates, and / or, claim 1, characterized in that more isocyanate compound is obtained by forming a crosslinked structure 2. A protective peeling film for transparent conductive film according to 2. 前記エポキシ系化合物及びイソシアネート系化合物が、多官能性エポキシ系化合物及び多官能性イソシアネート系化合物であることを特徴とする請求項1〜3のいずれかに記載の透明導電フィルム用の保護剥離用フィルム。 The protective release film for a transparent conductive film according to claim 1, wherein the epoxy compound and the isocyanate compound are a polyfunctional epoxy compound and a polyfunctional isocyanate compound. .
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