JP2004123769A - Method for adhesion treatment of heat-resistant sheet and pressure-sensitive adhesive sheet - Google Patents
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、粘着テープに関し、更に詳しくは、粘着剤と基材の間に塗布する接着処理剤に係る耐熱性シートの接着処理方法及びその方法により作成した基材を用いた粘着テープに関する。
【０００２】
【従来の技術】
粘着テープはその簡便性から、近年多くの分野に使用されるようになり、各種の製品が開発され多く用途で利用されている。その中で用途によっては、一旦貼り付けたテープを剥がし、その剥がした面に新たなテープを貼る場合が少なからずある。このような場合にあっては、単に「貼る」という機能だけでなく、テープを剥がした際に粘着剤（糊）が被着面に残らない機能を有することが粘着テープに要求される。こうした機能を有する粘着テープについては、従来からいくつかの提案がされ、また、実用化されているものもある。例えば、基材に下塗り層を塗布した後に粘着剤を形成することで、テープ基材と粘着剤層間の密着性、すなわち基材と粘着剤層間の投錨性を向上させ、被着体への糊残りの少ない粘着テープが提案されている（例えば特許文献１等）。また、支持体（基材）と粘着剤層及びその中間層として他の樹脂の層を設け、支持体、中間層及び粘着剤層の各層間の投錨力が優れ、従って剥離後の糊残りが無い粘着テープが提案されている（例えば特許文献２等）。
【特許文献１】
特開２０００−１９１９８９号公報
【特許文献２】
特開２０００−６３７７４号公報
【０００３】
【発明が解決しようとする課題】
しかし、こうした従来技術は、特定の基材や粘着剤及び中間層の組み合わせで実現できる粘着テープであり、いくつかの用途では非常に優れた機能を発揮し、上記要求を十分に満足させるものである一方、多目的な粘着テープとしては必ずしもその機能を生かすことができない場合もある。また、粘着剤と基材及びその間に塗布する接着処理剤からなる粘着テープを作製する場合であって、接着処理剤について種々検討されて来ているが、糊残りを完全に無くす方法はまだ見つかっていないのが実情である。特に、使用温度が２００℃を超える用途では、糊残りが多く、改善が求められている。
【０００４】
そこで、本発明の目的は、上記のような問題点を解決すべく、投錨力を改善する接着処理方法を提供するとともに、こうした方法により作製された接着処理面に凝集力を高めた粘着剤を塗布、場合によっては下塗剤を塗布後、粘着剤を塗布して糊残りの生じない粘着テープを供給することにある。
【０００５】
【課題を解決するための手段】
本発明者らは、この要求を満足させる方法を鋭意研究した結果、耐熱性シートに所定の接着処理方法を施すことによって、優れた投錨力を得ることを見出し、本発明を完成するに至った。
【０００６】
すなわち、耐熱性シートの接着処理方法であって、耐熱性シートの少なくとも片面に接着処理剤及び溶媒から成る接着処理溶液を塗布し、次いで、接着処理溶液中の溶媒を急激に蒸発させて、固形成分中に連泡状態の空孔或いは／及び亀裂を生じさせ、しかも接着処理剤が成型化する温度に加熱することを特徴とする。接着効果のある接着剤層を更に発泡、亀裂等の手段により表面を凹凸にすることで、粘着剤がこの凹凸面に絡み付くことによる投錨効果向上を狙ったものである。
【０００７】
また、こうした方法によって作製された基材（以下「中間体」という。）に粘着剤を塗布してなる粘着テープであって、接着処理剤が、その内の固形成分中に連泡状態の空孔或いは／及び亀裂を有した状態で成型化されたことを特徴とする。上記のような投錨効果を有する中間体に凝集力を高めた粘着剤を塗布、場合によっては下塗剤を塗布後、粘着剤を塗布することで、剥離後の糊残りが無い粘着テープが可能となる。
【０００８】
また、上記接着処理溶液が、シリカ粒子、ふっ素樹脂、界面活性剤及び水から成り、その固形成分が５〜８０％であることが好ましい。こうした材料の組み合わせや組成を条件として、安定した接着処理が可能となり、均一な品質を有する粘着テープの提供が可能となる。
【０００９】
上記粘着テープの基材としては、ポリイミドフィルム、ポリアミドシート、ふっ素フィルム．ガラスクロスにふっ素樹脂を含浸した含浸布を用いることが好ましい。こうした基材は、一定の耐熱性、強度などの粘着テープの特性を確保しつつ、接着処理剤および粘着剤との適応性を有して多種多様な用途に適用することが可能である。
【００１０】
また、接着処理面に粘着剤を塗布するに際して、粘着剤のゲル分率が２０〜６０％であることが好ましい。ゲル分率がかかる範囲にあれば、粘着剤の凝集力を高めることができ、高温で使用後にテープを剥がしても、糊残りの無い粘着テープを得ることができることが判明した。
【００１１】
さらに、上記粘着剤が、シリコーン系粘着剤であることが好ましい。これにより、高温に対する耐性、強度、柔軟性などの粘着テープの特性を確保しつつ、接着処理剤との適応性を有して多種多様な用途に適用することが可能である。
【００１２】
【発明の実施の形態】
以下、本発明の実施の形態について説明する。
【００１３】
本発明の耐熱性シートの接着処理方法は、耐熱性シートの少なくとも片面に接着処理剤及び溶媒から成る接着処理溶液を塗布し、次いで、接着処理溶液中の溶媒を急激に蒸発させて、固形成分中に連泡状態の空孔或いは／及び亀裂を生じさせ、しかも接着処理剤が成型化する温度に加熱することを特徴とする。接着効果のある下塗り剤層を更に発泡、亀裂等の手段により表面を凹凸にすることで、粘着剤がこの凹凸面に絡み付くことによる投錨効果向上を狙ったものである。
【００１４】
また、こうした方法によって作製された中間体は、粘着剤を塗布して粘着テープとして利用される。つまり、接着処理剤内の固形成分中に連泡状態の空孔或いは／及び亀裂を有した状態で成型化されたことを特徴とする粘着テープが作製可能となり、投錨効果の優れた中間体に、凝集力を高めた粘着剤を塗布、場合によっては下塗剤を塗布後、粘着剤を塗布することで、剥離後に糊残りが無い粘着テープが可能となる。
【００１５】
なお、本発明に使用される接着処理溶液は、接着処理剤と溶媒からなり、必要に応じて、架橋剤、硬化剤、有機或いは無機充填剤を添加することができる。
【００１６】
接着処理剤としては、ポリエステル樹脂、メラミン樹脂、アクリル樹脂、シリコーン樹脂、ＰＦＡ、ＦＥＰ、ＰＴＦＥ等のふっ素樹脂などがテープの構成に合わせて選択される。 ドライ状態での塗布量は、０．５〜２０ｇ／ｍ２ 、好ましくは１〜１０ｇ／ｍ２ で、硬化を必要とする場合は、イソシアネート系、アミン系などの硬化剤或いはペンゾイルパーオキサイドなどのような過酸化物が使用される。塗布量が、０．５ｇ／ｍ２ 未満の場合は加熱しても接着処理剤に連泡状態の空孔或いは／及び亀裂が生ぜず、また２０ｇ／ｍ２ を超えて塗布しても塗布量に見合った効果が得られない。
【００１７】
溶媒としては、トルエン、キシレン、メチルエチルケトン、酢酸エチル、ブチルアルコール、水など及びこれらの混合物が使用される。
【００１８】
充填剤としては、メラミン樹脂，エボキシ樹脂、アクリル樹脂等のような有機樹脂粉末或いは酸化マグネシウム、酸化アルミニウム、シリカなどの無機粉末が使用される。添加量としては、接着処理剤全重量の５〜８０％、好ましくは１０〜６０％の範囲で使用される。
【００１９】
加熱温度としては、使用溶媒の沸点に２０を加算した温度（℃）以上で、しかも接着処理剤が成型化し、材料が事実上劣化しない限り高温で処理する方が良い。混合溶剤の場合は、最も高い溶媒の沸点を基に上記内容で、加熱温度を決定する。
【００２０】
また、上記接着処理溶液が、シリカ粒子、ふっ素樹脂、界面活性剤及び水から成り、その固形成分が５〜８０％であることが好ましく、さらに好ましくは１０〜５０％が効果的である。５％未満の場合は，加熱しても接着処理剤に連泡状態の空孔或いは／及び亀裂が生ぜず、８０％を超えると接着処理溶液の粘度が増大するため、塗布面の荒れが発生して品質が安定しない。こうした材料の組み合わせや組成を条件として、安定した接着処理が可能となる。
【００２１】
上記粘着テープの基材としては、ポリイミドフィルム、ポリアミドシート、ふっ素フィルム、ガラスクロスにふっ素樹脂を含浸した含浸布を用いることが好ましい。こうした基材は、耐熱性に優れるとともに、強度、加工性などの粘着テープの特性を確保しつつ、接着処理を介した粘着剤との適応性にも優れた材料である。なお、本発明に用いられる基材としては、上記以外にも、紙類、ポリエステルフィルム、金属箔などが挙げられる。
【００２２】
また、接着処理面に粘着剤を塗布するに際して、粘着剤のゲル分率が２０〜６０％であることが好ましい。架橋剤の配合量として粘着剤のゲル分率が２０％未満の場合は、使用後に粘着テープを剥がすと粘着剤の凝集破壊が発生し、粘着剤が被着体に残るという問題が発生する。ゲル分率が６０％を超えると、粘着剤が硬くなるため粘着力が低下し、使用中に粘着テープが剃れるという問題が発生しかねない。ゲル分率がかかる範囲にあれば、粘着剤の凝集力を高めることができ、高温で使用後にテープを剥がしても、糊残りの無い粘着テープを得ることができることが判明した。
【００２３】
さらに、上記粘着剤が、シリコーン系粘着剤であることが好ましい。高温に対する耐性、強度、柔軟性などの粘着テープに要求される特性を有しつつ、接着処理剤との適応性を有している。なお、シリコーン系粘着剤以外にも、ゴム系、アクリル系なども使用可能であり、用途にあわせて選択され、架橋剤としては硫黄、メラミン系樹脂、イソシアネート系樹脂、過酸化物等が使用される。
【００２４】
また、粘着剤の厚さとしては、４〜７０μｍが一般的である。４μｍ未満であると、粘着力が低く使用中に剥れる可能性がある。７０μｍを超えても特に効果は見られず、下記するヒートシール用途では、粘着テープの厚み方向の熱伝導率が低下してかえって不都合が生じる。
【００２５】
本発明では、以上のようなシートの接着処理方法を採用することにより、投錨力の改善を図ることができるとともに、凝集力を高めた粘着剤を塗布、場合によっては下塗剤を塗布後、粘着剤を塗布することにより、剥離後の糊残りが生じない粘着テープを供給することができる。このような粘着テープは、マスキングテープ、ヒートシール用テープ等の用途に利用すると、テープの貼り付け・取り剥がしを繰り返して使用する場合であっても、テープの糊残りを生じることなく、本発明の優れた投錨力と凝集力を活かすことができ、各用途において求められる機能を最大限満足した粘着テープとして有用である。
【００２６】
【実施例】
以下、本発明の構成と効果を具体的に示す実施例について説明する。各実施例における評価項目は下記の通りである。なお、これら各実施例は、本発明を制限するものではない。
【００２７】
＜評価方法＞
（１）粘着力
１９ｍｍ×２００ｍｍの試料を用いＪＩＳ Ｃ ２１０７に基づいて測定した。
（２）糊残り
試料（１９ｍｍ×２００ｍｍ）をステンレス板（ＳＵＳ３０４ＢＡ板）に２ｋｇローラ１往復で貼り合わせて室温にて３０分放置し、所定温度に２４０時間放置した後、室温にて３０分放置した。次に、テンシロン型万能引張試験機を用い、室温にて、３０ｍｍ／ｍｉｎ及び３００ｍｍ／ｍｉｎの速度で１８０°方向に引き剥がし、ＳＵＳ表面の粘着剤残留状態を調べた。ここで、所定温度とは、アクリル系粘着剤の場合は８０℃をいい、シリコーン粘着剤の場合は２００℃をいう。
（３）ゲル分率
以下に記載する方法によって求める
１） １９ｍｍ×約２５０ｍｍの試料を用意する。
２） この試料を秤量する。（Ａｇ）
３） この試料を約３００ｍｌのトルエンに４８時間浸漬する。
４） ３０分風乾後、１２０℃、２時間でトルエンを除去する。
５） 室温に取り出し、３０分放置する。
６） この試料を秤量する。（Ｂｇ）
７） 試料の粘着剤を除去し、基材のみとする。
８） 基材を秤量する。（Ｃｇ）
９） 下の式１で、ゲル分率（％）を求める。
ゲル分率（％）＝（Ｂ−Ｃ）／（Ａ−Ｃ）×１００ 式１
（４）投錨力
試料（１９ｍｍ×２００ｍｍ）の糊面に、カプトン粘着テープ（日東電工製：Ｎｏ．３６０、１ミル品）の糊面をハンドロールで貼り合わせる。室温に２４時間放置した後、試料の基材と粘着剤との間で引き剥がせるように試験サンプルを作成し、これをテンシロン型引張試験機により１８０°方向に３００ｍｍ／ｍｉｎの速度で引き剥がし、投錨力を求めた。
【００２８】
＜実施例１＞
ボリイミドフィルム（東レ・デュポン社製：製品名カプトンフィルム１００Ｈ）の片面にアクリル樹脂（三菱レイヨン社製：商品名アクリペットＶＨ）の１０％トルエン溶液をドライ状態での塗布量が４ｇ／ｍ２ となるように塗布し、直ちに１７０℃で５分間加熱する。次に、この接着処理面にアクリル系粘着剤（２エチルヘキシルアクリレート／アクリル酸＝１００／１：分子量７０万）１００重量部にイソシアネート系硬化剤５重量部を添加した３０％トルエン溶液をドライ状態での塗布厚が、３５μｍになるよう塗布した。これを、室温に１０分間放置した後、１３０℃で５分間加熱して硬化させて、粘着テープを得た。
【００２９】
＜実施例２＞
ガラスクロス（鐘紡社製：商品名ＫＳ １０９０）の両側にＰＴＦＥ樹脂を９０ｇ／ｍ２ 塗布した含浸布の片面にＰＦＡ樹脂（ダイキン工業社製：商品名ネオフロンＰＦＡ ＡＤ−２ＣＲ）１００重量部に対し、シリカ（日産化学社製：商品名スノーテックス Ｎ）６０重量部、界面活性剤（第一工業製薬社製：商品名ノイゲン ＥＡ−１３７）２重量部及び水３００重量部の接着処理剤溶液をドライ状態での塗布量が１．５ｇ／ｍ２ になるように塗布し、直ちに２００℃で１分間加熱し、次に３７０℃で３０秒間加熱した。この接着処理剤塗布面にシリコーン粘着剤１００重量部に対してベンゾイルパーオキサイド２．５重量部の３５％キシレン溶液をドライ状態での塗布厚が４５μｍになるように塗布した後、８０℃に３分間続いて２００℃で５分間加熱して粘着テープを得た。
【００３０】
＜比較例１＞
実施例１のアクリル樹脂塗布後の加熱温度を８０℃で１０分に変更した以外は同様にして、粘着テープを得た。
【００３１】
＜比較例２＞
実施例１のアクリル樹脂の塗布量を０．２ｇ／ｍ２ に変更した以外は同様にして、粘着テープを得た。
【００３２】
＜比較例３＞
実施例１のイソシアネート系硬化剤を１重量部に変更した以外は同様にして、粘着テープを得た。
【００３３】
＜比較例４＞
実施例２の接着処理剤溶液塗布後の加熱温度を１００℃で１０分に変更した以外は同様にして、粘着テープを得た。
【００３４】
＜比較例５＞
実施例２の接着処理剤溶液のドライ状態での塗布量を０．１ｇ／ｍ２ に変更した以外は同様にして、粘着テープを得た。
【００３５】
＜比較例６＞
実施例２の接着処理剤溶液のベンゾイルパーオキサイド０．５重量部に変更した以外は同様にして、粘着テープを得た。
【００３６】
＜試験結果＞
上記４つの評価項目について、各例の試験結果を表１に示す。
【表１】
表１の結果が示すように、実施例１および２については、糊残りもなく、投錨力も高く、各評価項目で適正な結果が得られた。一方、比較例１〜６については、いずれも糊残りが発生し、不適正な結果となった。特に比較例１，２，４，５については、投錨力が非常に低く、いわゆる投錨破壊の発生がみられ、比較例３および６については、投錨力は高いもののゲル分率が非常に低く、凝集力の低下によるいわゆる凝集破壊の発生がみられた。
【００３８】
【発明の効果】
以上のように、本発明の耐熱性シートの接着処理方法においては、接着効果のある接着処理剤層を更に発泡、亀裂等の手段により表面を凹凸にすることで、粘着剤あるいは下塗剤がこの凹凸面に絡み付き投錨効果が大幅に向上した。
【００３９】
従って、こうした方法によって作製された中間体に凝集力を高めた粘着剤を塗布、場合によっては下塗剤を塗布後、粘着剤を塗布してなる粘着テープにあっては、投錨力、凝集力が非常に優れたものとなり、剥がした際に、糊残りが生じることがないという効果が得られる。これによって、再度貼り付けをする場合であっても、被着体のクリーニングが不要となり、特に高温で使用する場合にクリ−ニングのため室温まで冷却するのを待たなければならないといった不都合が解消され、また、クリーニングのために使用しなければならない有機溶剤が不要となるという効果が得られることとなる。つまり、前者については、時間の短縮は生産性の向上に結びつき、後者については、衛生・安全面での改善が図られるという、さらに進んだ技術的効果が得られることとなる。
【００４０】
また、上記接着処理溶液を特定の材料に限定し、それらの固形成分を一定範囲にすることで、さらに安定した接着処理が可能となり、投錨力が高く、均一な品質を有する粘着テープの提供が可能となる。
【００４１】
同様に、粘着テープの基材としては、ポリイミドフィルム等を選択すると、一層優れた耐熱性、強度などの粘着テープの特性を確保しつつ、接着処理剤および粘着剤との適応性を有して多種多様な用途に適用することが可能である。
【００４２】
また、接着処理面に粘着剤を塗布するに際して、粘着剤のゲル分率を所定の範囲にすると、粘着剤の凝集力を高めることができ、高温で使用後にテープを剥がしても、糊残りの無い粘着テープを得ることができる。
【００４３】
さらに、上記粘着剤が、シリコーン系粘着剤である場合には、高温に対する耐性、強度、柔軟性などの粘着テープの特性を確保しつつ、接着処理剤との適応性を有して多種多様な用途に適用することが可能である。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pressure-sensitive adhesive tape, and more particularly, to a method for bonding a heat-resistant sheet to a bonding agent applied between a pressure-sensitive adhesive and a substrate, and a pressure-sensitive adhesive tape using a substrate prepared by the method.
[0002]
[Prior art]
Adhesive tapes have been used in many fields in recent years because of their simplicity, and various products have been developed and used in many applications. Among them, depending on the application, there are many cases where the tape once applied is peeled off and a new tape is affixed to the peeled surface. In such a case, the pressure-sensitive adhesive tape is required to have not only a function of “sticking” but also a function of not leaving an adhesive (glue) on the surface to be adhered when the tape is peeled off. Some proposals have been made on the adhesive tape having such a function, and some of them have been put to practical use. For example, by forming a pressure-sensitive adhesive after applying an undercoat layer to a substrate, the adhesiveness between the tape substrate and the pressure-sensitive adhesive layer, that is, the anchoring property between the substrate and the pressure-sensitive adhesive layer is improved, and the adhesive to the adherend is improved. A pressure-sensitive adhesive tape with a small remaining amount has been proposed (for example, Patent Document 1). Further, a layer of another resin is provided as a support (base material), an adhesive layer and an intermediate layer thereof, and an anchoring force between each of the support, the intermediate layer and the adhesive layer is excellent, and therefore, adhesive residue after peeling is reduced. A pressure-sensitive adhesive tape has been proposed (for example, Patent Document 2).
[Patent Document 1]
JP 2000-191989 [Patent Document 2]
JP 2000-63774 A
[Problems to be solved by the invention]
However, such conventional techniques are pressure-sensitive adhesive tapes that can be realized by a combination of a specific base material, a pressure-sensitive adhesive, and an intermediate layer, exhibit extremely excellent functions in some applications, and sufficiently satisfy the above requirements. On the other hand, in some cases, the function cannot be fully utilized as a versatile adhesive tape. Also, in the case of producing a pressure-sensitive adhesive tape composed of a pressure-sensitive adhesive, a base material, and a bonding agent applied between them, various studies have been made on the bonding agent, but a method for completely removing the adhesive residue has not yet been found. It is not the fact. In particular, in applications where the use temperature exceeds 200 ° C., a large amount of glue remains, and improvement is required.
[0004]
Therefore, an object of the present invention is to provide an adhesive treatment method for improving the anchoring force in order to solve the above-mentioned problems, and to provide a pressure-sensitive adhesive having an increased cohesive force on an adhesive treated surface produced by such a method. The object of the present invention is to supply an adhesive tape which is free from adhesive residue by applying an adhesive and then applying a primer, if necessary.
[0005]
[Means for Solving the Problems]
The present inventors have conducted intensive studies on a method for satisfying this requirement, and as a result, have found that an excellent anchoring force can be obtained by applying a predetermined bonding treatment method to a heat-resistant sheet, thereby completing the present invention. .
[0006]
That is, a method of bonding a heat-resistant sheet, in which an adhesive processing solution comprising an adhesive and a solvent is applied to at least one surface of the heat-resistant sheet, and then the solvent in the adhesive processing solution is rapidly evaporated to obtain a solid. It is characterized in that open pores and / or cracks are formed in the components, and the components are heated to a temperature at which the bonding agent is molded. The surface of the adhesive layer having an adhesive effect is made uneven by means of foaming, cracking or the like, thereby improving the anchoring effect due to the adhesive being entangled with the uneven surface.
[0007]
An adhesive tape obtained by applying an adhesive to a base material (hereinafter, referred to as an “intermediate”) produced by such a method, wherein an adhesive treatment agent has an open-cell foam in a solid component therein. It is characterized by being molded with holes or / and cracks. By applying an adhesive with increased cohesion to the intermediate having an anchoring effect as described above, in some cases after applying a primer, by applying the adhesive, an adhesive tape without adhesive residue after peeling is possible. Become.
[0008]
Further, it is preferable that the adhesive treatment solution is composed of silica particles, a fluororesin, a surfactant and water, and its solid component is 5 to 80%. Under the conditions of the combination and composition of such materials, stable adhesive treatment can be performed, and a pressure-sensitive adhesive tape having uniform quality can be provided.
[0009]
Examples of the base material of the pressure-sensitive adhesive tape include a polyimide film, a polyamide sheet, and a fluorine film. It is preferable to use an impregnated cloth in which a glass cloth is impregnated with a fluororesin. Such a base material can be applied to a wide variety of uses while maintaining certain properties of the pressure-sensitive adhesive tape, such as heat resistance and strength, and having compatibility with an adhesive treatment agent and a pressure-sensitive adhesive.
[0010]
Further, when the pressure-sensitive adhesive is applied to the adhesion-treated surface, the gel fraction of the pressure-sensitive adhesive is preferably 20 to 60%. It has been found that when the gel fraction is in such a range, the cohesive force of the pressure-sensitive adhesive can be increased, and a pressure-sensitive adhesive tape having no adhesive residue can be obtained even when the tape is peeled off after use at a high temperature.
[0011]
Further, the pressure-sensitive adhesive is preferably a silicone-based pressure-sensitive adhesive. Thereby, it is possible to apply the adhesive tape to various kinds of applications while maintaining the properties of the pressure-sensitive adhesive tape, such as resistance to high temperatures, strength, and flexibility, while having adaptability to the adhesive treatment agent.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0013]
The method for bonding a heat-resistant sheet according to the present invention includes applying a bonding solution comprising an adhesive and a solvent to at least one surface of the heat-resistant sheet, and then rapidly evaporating the solvent in the bonding solution to form a solid component. The method is characterized in that voids and / or cracks in an open cell state are generated therein, and that the adhesive is heated to a temperature at which the bonding agent is molded. The surface of the undercoating layer having an adhesive effect is made uneven by means of foaming, cracking, or the like, thereby improving the anchoring effect by entanglement of the adhesive with the uneven surface.
[0014]
The intermediate produced by such a method is coated with an adhesive and used as an adhesive tape. In other words, it is possible to produce an adhesive tape characterized by being molded with open pores and / or cracks in the solid component in the adhesive treatment agent, making it an intermediate having an excellent anchoring effect. By applying a pressure-sensitive adhesive having an increased cohesive force and, in some cases, applying a primer, and then applying the pressure-sensitive adhesive, a pressure-sensitive adhesive tape having no adhesive residue after peeling can be obtained.
[0015]
The adhesive treatment solution used in the present invention comprises an adhesive treatment agent and a solvent, and a crosslinking agent, a curing agent, an organic or inorganic filler can be added as necessary.
[0016]
As the adhesive treatment agent, a polyester resin, a melamine resin, an acrylic resin, a silicone resin, a fluororesin such as PFA, FEP, PTFE, and the like are selected according to the configuration of the tape. The amount of application in a dry state is 0.5 to 20 g / m 2 , preferably 1 to 10 g / m 2. When curing is required, a curing agent such as an isocyanate type or an amine type or benzoyl peroxide is used. Such peroxides are used. Coating amount, 0.5 g / m in the case of less than 2 not generated vacancy or / and crack communicating bubble state adhesive treatment agent be heated and the coating amount be applied beyond 20 g / m 2 The effect corresponding to is not obtained.
[0017]
As the solvent, toluene, xylene, methyl ethyl ketone, ethyl acetate, butyl alcohol, water and the like and a mixture thereof are used.
[0018]
As the filler, an organic resin powder such as a melamine resin, an ethoxy resin, an acrylic resin, or the like, or an inorganic powder such as magnesium oxide, aluminum oxide, or silica is used. The addition amount is in the range of 5 to 80%, preferably 10 to 60% of the total weight of the bonding agent.
[0019]
The heating temperature is preferably not lower than the temperature (° C.) obtained by adding 20 to the boiling point of the solvent used, and it is better to treat at a high temperature unless the adhesive treatment agent is molded and the material is practically deteriorated. In the case of a mixed solvent, the heating temperature is determined based on the above description based on the highest boiling point of the solvent.
[0020]
Further, the adhesive treatment solution is composed of silica particles, a fluororesin, a surfactant and water, and its solid component is preferably 5 to 80%, more preferably 10 to 50%. If it is less than 5%, even if heated, no pores and / or cracks will be formed in the adhesive treatment agent in a continuous cell state, and if it exceeds 80%, the viscosity of the adhesive treatment solution will increase, and the coating surface will be roughened. And the quality is not stable. Under the conditions of such a combination and composition of the materials, a stable bonding treatment can be performed.
[0021]
As the base material of the pressure-sensitive adhesive tape, it is preferable to use a polyimide film, a polyamide sheet, a fluorine film, or an impregnated cloth obtained by impregnating a glass cloth with a fluorine resin. Such a base material is a material having excellent heat resistance, as well as excellent properties of the adhesive tape such as strength and workability, and also excellent adaptability to an adhesive through an adhesive treatment. In addition, as the substrate used in the present invention, other than the above, papers, polyester films, metal foils and the like can be mentioned.
[0022]
Further, when the pressure-sensitive adhesive is applied to the adhesion-treated surface, the gel fraction of the pressure-sensitive adhesive is preferably 20 to 60%. If the gel fraction of the pressure-sensitive adhesive is less than 20%, the cohesive failure of the pressure-sensitive adhesive occurs when the pressure-sensitive adhesive tape is peeled off after use, causing a problem that the pressure-sensitive adhesive remains on the adherend. If the gel fraction exceeds 60%, the pressure-sensitive adhesive becomes hard and the adhesive strength decreases, which may cause a problem that the pressure-sensitive adhesive tape is shaved during use. It has been found that when the gel fraction is in such a range, the cohesive force of the pressure-sensitive adhesive can be increased, and a pressure-sensitive adhesive tape having no adhesive residue can be obtained even when the tape is peeled off after use at a high temperature.
[0023]
Further, the pressure-sensitive adhesive is preferably a silicone-based pressure-sensitive adhesive. While having properties required for pressure-sensitive adhesive tapes such as resistance to high temperature, strength, and flexibility, it has adaptability to an adhesive treatment agent. In addition, besides silicone-based adhesives, rubber-based, acrylic-based, etc. can also be used, and are selected according to the application. As the crosslinking agent, sulfur, melamine-based resin, isocyanate-based resin, peroxide, etc. are used. You.
[0024]
The thickness of the adhesive is generally 4 to 70 μm. When the thickness is less than 4 μm, the adhesive strength is low and the adhesive may peel off during use. Even if the thickness exceeds 70 μm, no particular effect is seen, and in the following heat sealing applications, the thermal conductivity in the thickness direction of the pressure-sensitive adhesive tape is reduced, which is disadvantageous.
[0025]
In the present invention, by adopting the above-described sheet bonding treatment method, it is possible to improve the anchoring force, and to apply a pressure-sensitive adhesive having increased cohesion, and in some cases, to apply a primer, By applying the agent, it is possible to supply a pressure-sensitive adhesive tape that does not cause adhesive residue after peeling. When such an adhesive tape is used for applications such as a masking tape and a heat-sealing tape, even when the tape is repeatedly used for attaching and detaching, the adhesive tape of the present invention can be used without causing adhesive residue on the tape. It can make use of its excellent anchoring and cohesive strength, and is useful as an adhesive tape that satisfies the functions required for each application to the maximum.
[0026]
【Example】
Hereinafter, examples that specifically show the configuration and effects of the present invention will be described. The evaluation items in each example are as follows. Note that these embodiments do not limit the present invention.
[0027]
<Evaluation method>
(1) It was measured based on JIS C 2107 using a sample having an adhesive strength of 19 mm × 200 mm.
(2) A glue-remaining sample (19 mm × 200 mm) was stuck on a stainless steel plate (SUS304BA plate) with one reciprocation of a 2 kg roller, left at room temperature for 30 minutes, left at a predetermined temperature for 240 hours, and then left at room temperature for 30 minutes. did. Next, using a Tensilon type universal tensile tester, it was peeled off at 180 ° direction at room temperature at a speed of 30 mm / min and 300 mm / min, and the state of the adhesive remaining on the SUS surface was examined. Here, the predetermined temperature refers to 80 ° C. for an acrylic pressure-sensitive adhesive and 200 ° C. for a silicone pressure-sensitive adhesive.
(3) Gel fraction Determined by the method described below 1) Prepare a sample of 19 mm × about 250 mm.
2) Weigh this sample. (Ag)
3) This sample is immersed in about 300 ml of toluene for 48 hours.
4) After air drying for 30 minutes, toluene is removed at 120 ° C. for 2 hours.
5) Remove to room temperature and leave for 30 minutes.
6) Weigh this sample. (Bg)
7) Remove the adhesive from the sample, leaving only the substrate.
8) Weigh the substrate. (Cg)
9) Calculate the gel fraction (%) by the following equation (1).
Gel fraction (%) = (BC) / (AC) × 100 Formula 1
(4) A glue surface of a Kapton adhesive tape (Nitto Denko: No. 360, 1 mil product) is stuck to a glue surface of the anchor force sample (19 mm × 200 mm) with a hand roll. After being left at room temperature for 24 hours, a test sample was prepared so that it could be peeled off between the base material of the sample and the adhesive, and this was peeled off at a speed of 300 mm / min in a 180 ° direction using a Tensilon type tensile tester. , The anchoring power was sought.
[0028]
<Example 1>
A 10% toluene solution of an acrylic resin (manufactured by Mitsubishi Rayon Co., Ltd .: Acrypet VH) was applied to one side of a polyimide film (manufactured by Dupont Toray, product name: Kapton film 100H) in a dry state at a coating amount of 4 g / m 2. And immediately heated at 170 ° C. for 5 minutes. Next, a 30% toluene solution obtained by adding 5 parts by weight of an isocyanate-based curing agent to 100 parts by weight of an acrylic pressure-sensitive adhesive (2 ethylhexyl acrylate / acrylic acid = 100/1: molecular weight 700,000) was applied to the adhesive-treated surface in a dry state. Was applied so that the applied thickness became 35 μm. This was left at room temperature for 10 minutes, and then heated and cured at 130 ° C. for 5 minutes to obtain an adhesive tape.
[0029]
<Example 2>
100 g of PFA resin (manufactured by Daikin Industries, Ltd .: NEOFLON PFA AD-2CR) on one side of an impregnated cloth coated with 90 g / m 2 of PTFE resin on both sides of a glass cloth (manufactured by Kanebo: KS 1090) An adhesive treatment solution containing 60 parts by weight of silica (trade name: Snowtex N, manufactured by Nissan Chemical Co., Ltd.), 2 parts by weight of a surfactant (trade name: Neugen EA-137, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) and 300 parts by weight of water. The coating was performed so that the coating amount in a dry state was 1.5 g / m 2 , and immediately heated at 200 ° C. for 1 minute, and then heated at 370 ° C. for 30 seconds. After applying a 35% xylene solution of 2.5 parts by weight of benzoyl peroxide to 100 parts by weight of the silicone pressure-sensitive adhesive so that the coating thickness in a dry state becomes 45 μm, the adhesive treatment agent is heated at 80 ° C. After heating for 5 minutes at 200 ° C. for 5 minutes, an adhesive tape was obtained.
[0030]
<Comparative Example 1>
An adhesive tape was obtained in the same manner as in Example 1 except that the heating temperature after the application of the acrylic resin was changed to 80 ° C. for 10 minutes.
[0031]
<Comparative Example 2>
An adhesive tape was obtained in the same manner as in Example 1 except that the amount of the acrylic resin applied was changed to 0.2 g / m 2 .
[0032]
<Comparative Example 3>
An adhesive tape was obtained in the same manner as in Example 1 except that the isocyanate-based curing agent was changed to 1 part by weight.
[0033]
<Comparative Example 4>
An adhesive tape was obtained in the same manner as in Example 2, except that the heating temperature after application of the adhesive agent solution was changed to 100 ° C. for 10 minutes.
[0034]
<Comparative Example 5>
A pressure-sensitive adhesive tape was obtained in the same manner as in Example 2, except that the amount of the adhesive treatment solution in the dry state was changed to 0.1 g / m 2 .
[0035]
<Comparative Example 6>
An adhesive tape was obtained in the same manner as in Example 2, except that the benzoyl peroxide in the adhesive treatment solution was changed to 0.5 part by weight.
[0036]
<Test results>
Table 1 shows the test results of each of the above four evaluation items.
[Table 1]
As shown in the results of Table 1, in Examples 1 and 2, there was no adhesive residue and the anchoring force was high, and appropriate results were obtained in each evaluation item. On the other hand, in Comparative Examples 1 to 6, adhesive residue was generated in all cases, resulting in inappropriate results. In particular, in Comparative Examples 1, 2, 4, and 5, the anchoring force was very low, and so-called anchor breakage was observed. In Comparative Examples 3 and 6, although the anchoring force was high, the gel fraction was very low. The occurrence of so-called cohesive failure due to a decrease in cohesive force was observed.
[0038]
【The invention's effect】
As described above, in the adhesive treatment method of the heat-resistant sheet of the present invention, the surface of the adhesive treatment agent layer having an adhesive effect is further made uneven by means of foaming, cracking, etc. The anchoring effect is greatly improved due to the entanglement on the uneven surface.
[0039]
Therefore, an adhesive with increased cohesive strength is applied to the intermediate produced by such a method, and in some cases, after applying a primer, the adhesive tape formed by applying the adhesive has an anchoring force and a cohesive force. It is very excellent, and an effect that no adhesive residue occurs when peeled off is obtained. This eliminates the need to clean the adherend even when re-attaching, and eliminates the inconvenience of having to wait for cooling to room temperature for cleaning, especially when used at high temperatures. In addition, an effect that an organic solvent that must be used for cleaning is not required can be obtained. In other words, for the former, a reduction in time leads to an improvement in productivity, and for the latter, an improved technical effect can be obtained in that improvements in hygiene and safety can be achieved.
[0040]
Further, by limiting the adhesive treatment solution to a specific material, and by setting the solid components in a certain range, it is possible to perform a more stable adhesive treatment, provide a high anchoring force, and provide a pressure-sensitive adhesive tape having uniform quality. It becomes possible.
[0041]
Similarly, when a polyimide film or the like is selected as the base material of the pressure-sensitive adhesive tape, even more excellent heat resistance, while securing the properties of the pressure-sensitive adhesive tape such as strength, it has compatibility with an adhesive treatment agent and a pressure-sensitive adhesive. It can be applied to a wide variety of uses.
[0042]
Further, when the adhesive is applied to the adhesive-treated surface, if the gel fraction of the adhesive is within a predetermined range, the cohesive force of the adhesive can be increased, and even if the tape is peeled off after use at a high temperature, the adhesive residue will remain. No adhesive tape can be obtained.
[0043]
Furthermore, when the pressure-sensitive adhesive is a silicone-based pressure-sensitive adhesive, while maintaining the properties of the pressure-sensitive adhesive tape such as resistance to high temperatures, strength, and flexibility, it has a wide variety of properties having compatibility with an adhesive treatment agent. It is possible to apply to the application.
Claims (7)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002285455A JP4204835B2 (en) | 2002-09-30 | 2002-09-30 | Adhesive tape and method of using adhesive tape |
| CN 03159486 CN1271160C (en) | 2002-09-30 | 2003-09-27 | Sticking processing method for heat-resisting sheet and sticking band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002285455A JP4204835B2 (en) | 2002-09-30 | 2002-09-30 | Adhesive tape and method of using adhesive tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004123769A true JP2004123769A (en) | 2004-04-22 |
| JP4204835B2 JP4204835B2 (en) | 2009-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002285455A Expired - Lifetime JP4204835B2 (en) | 2002-09-30 | 2002-09-30 | Adhesive tape and method of using adhesive tape |
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| Country | Link |
|---|---|
| JP (1) | JP4204835B2 (en) |
| CN (1) | CN1271160C (en) |
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| WO2017098919A1 (en) * | 2015-12-10 | 2017-06-15 | 株式会社寺岡製作所 | Adhesive composition and adhesive tape |
| CN115232572A (en) * | 2021-06-11 | 2022-10-25 | 中国石油大学(北京) | Adhesive tape and preparation method and application thereof |
| CN115232572B (en) * | 2021-06-11 | 2024-01-23 | 中国石油大学(北京) | Adhesive tape and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
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| CN1493635A (en) | 2004-05-05 |
| JP4204835B2 (en) | 2009-01-07 |
| CN1271160C (en) | 2006-08-23 |
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