JP4162286B2 - Adhesive composition and its adhesive sheet - Google Patents

Adhesive composition and its adhesive sheet Download PDF

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Publication number
JP4162286B2
JP4162286B2 JP04531798A JP4531798A JP4162286B2 JP 4162286 B2 JP4162286 B2 JP 4162286B2 JP 04531798 A JP04531798 A JP 04531798A JP 4531798 A JP4531798 A JP 4531798A JP 4162286 B2 JP4162286 B2 JP 4162286B2
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Japan
Prior art keywords
pressure
sensitive adhesive
adhesive composition
diol
acid
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JP04531798A
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Japanese (ja)
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JPH11241056A (en
Inventor
雅彦 安藤
泰之 徳永
和香 彦坂
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Nitto Denko Corp
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Nitto Denko Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、ポリエステルなどの縮合系重合体を主成分とした粘着剤組成物と、その粘着シ―ト類とに関するものである。
【0002】
【従来の技術】
縮合系重合体を主成分とした粘着剤組成物としては、たとえば、特開平9−263749号公報に、ポリカ―ボネ―ト構造を含むポリエステルを主成分した粘着剤組成物が開示されている。この種の粘着剤組成物は、室温付近では基本的に高弾性で非粘着ないし低粘着(タツクフリ―)であり、この性質から目的箇所以外の部分に不用意に接着しにくいという利点を有している。
【0003】
また、粘着テ―プは、粘着面の保護または取り扱い性の点より、粘着面に剥離ライナを貼り合わせている。剥離ライナとしては、アクリル系やゴム系などの粘着テ―プでは、良好な剥離性を得るために、表面にシリコ─ン処理を施したプラスチツクフイルムを用いているが、上記の縮合系重合体を主成分とした粘着剤組成物を用いた粘着テ―プでは、ポリオレフイン系フイルムなどからなるシリコ─ン処理を施していない剥離ライナを用いても、十分に良好な剥離性が得られる。このようなシリコ─ン処理を施していない剥離ライナでは、粘着面へのシリコンの移行の心配がなく、シリコンの存在を好まない電子機器用途などに対しても、なんの問題もなく使用できるという利点を有している。
【0004】
【発明が解決しようとする課題】
しかしながら、ポリカ―ボネ―ト構造を含むポリエステルなどの縮合系重合体を主成分した公知の粘着剤組成物は、上記利点を有する反面、瞬間的な接着が必要な用途、たとえば、高速連続接着作業や接着後直ちに応力がかかるような用途には、初期粘着性に乏しいために、使用できなかつた。
【0005】
本発明は、このような事情に鑑み、縮合系重合体を主成分した粘着剤組成物において、粘着力が大きく、かつシリコ─ン処理を施していない剥離ライナを使用しても良好な剥離性が得られ、しかも初期粘着性の改善された粘着剤組成物と、その粘着シ―ト類を提供することを目的としている。
【0006】
【課題を解決するための手段】
本発明者らは、上記の目的を達成するために、鋭意検討した結果、ポリエステルやポリウレタンなどの縮合系重合体を得る際の原料成分として、ポリカ―ボネ―ト構造を持つ脂肪族ジオ―ルないしジカルボン酸とともに、リノ―ル酸などの炭素数18の不飽和脂肪酸のダイマ―酸を水素化してなる水添ダイマ―酸またはこれを還元してなる水添ダイマ―ジオ―ルを用いると、特定のポリカ―ボネ―ト構造とともに、上記ダイマ―酸や水添ダイマ―ジオ―ルに由来する環式または非環式の特定のジオイルないしジオ―ル構造を持つ縮合系重合体が得られ、これによれば、粘着力が大きく、かつシリコ─ン処理を施していない剥離ライナに対しても良好な剥離性を示し、しかも初期粘着性の改善された粘着剤組成物が得られことを知り、本発明を完成するに至つたものである。
【0007】
すなわち、本発明は、a)つぎの式(A);
−(O−R−O−C)n−
‖ … (A)

(Rは炭素数2〜20の直鎖状または分枝状の脂肪族炭化水素基である)
で表される構造とともに、b)つぎの式(B1);
−C−R1 −C−
‖ ‖ … (B1)
O O
(R1 は炭素数34の環式または非環式の飽和炭化水素基である)
で表される構造か、つぎの式(B2);
−O−R2 −O− … (B2)
(R2 は炭素数36の環式または非環式の飽和炭化水素基である)
で表される構造かのいずれか少なくとも一方の構造を持つ縮合系重合体を含むことを特徴とする粘着剤組成物(請求項1)に係るものであり、とくに、上記式(B1)で表される構造が炭素数18の不飽和脂肪酸のダイマ―酸を水素化してなる水添ダイマ―酸に由来し、また上記式(B2)で表される構造が上記の水添ダイマ―酸を還元してなる水添ダイマ―ジオ―ルに由来するものである上記構成の粘着剤組成物(請求項2)を提供できるものである。
【0008】
また、本発明は、支持体の片面または両面に上記構成の粘着剤組成物からなる層を有することを特徴とするシ―ト状やテ―プ状などの形態とされた粘着シ―トまたはテープ(請求項3)に係るものであり、とくに粘着面にシリコ─ン処理を施していない剥離ライナが貼り合わされてなる上記構成の粘着シ―トまたはテープ(請求項4)、また上記のシリコ─ン処理を施していない剥離ライナが、ポリエチレン、ポリプロピレン、エチレン−プロピレン共重合体などからなるポリオレフイン系フイルムである上記構成の粘着シ―トまたはテープ(請求項5)を提供できるものである。
【0009】
【発明の実施の形態】
本発明に用いる縮合系重合体は、a成分の構造として前記の式(A)で表されるポリカ―ボネ―ト構造を持つとともに、b成分の構造として前記の式(B1)で表される環式または非環式のジオイル構造か、前記の式(B2)で表される環式または非環式のジオ―ル構造かのいずれか少なくとも一方の構造を持つものであり、上記a,b両成分の構造を持つ限り、その縮合形態は限定されない。最も代表的なものはポリエステルであり、その他、ポリウレタン、これとポリエステルとの混合物または共縮合物などを挙げることができる。
【0010】
ポリエステルからなる縮合系重合体は、ジカルボン酸成分とジオ―ル成分からなる原料成分として、式(A)で表されるポリカ―ボネ―ト構造を持つ化合物とともに、式(B1)で表されるジオイル構造を持つ化合物、式(B2)で表されるジオ―ル構造を持つ化合物、式(B1)で表されるジオイル構造と式(B2)で表されるジオ―ル構造との両方を持つ化合物のうちの少なくとも1種を用い、必要によりこれら以外のジカルボン酸成分やジオ―ル成分を加えて、常法によりエステル化反応させることにより、得ることができる。エステル化反応に際し、ジオ―ル成分とジカルボン酸成分は、当モル反応が望ましいが、エステル化反応を促進するために、どちらかを過剰に用いてもよい。
【0011】
式(A)で表されるポリカ―ボネ―ト構造を持つ化合物には、式中のRが炭素数2〜20の直鎖状または分枝状の脂肪族炭化水素基であるジオ―ル、ジカルボン酸、これらの低級アルキルエステルなどの誘導体がある。このうち、ジオ―ルは、市販品として容易に入手可能であり、とくに好ましく用いられる。具体的には、ポリヘキサメチレンカ―ボネ―トジオ―ル、ポリ(3−メチルペンテンカ―ボネ―ト)ジオ―ル、ポリ(2−メチルオクタン)ジオ―ル、ポリプロピレンカ―ボネ―トジオ―ル、それらの混合物や共重合物などがある。
【0012】
このようなジオ―ルの市販品としては、たとえば、ダイセル化学工業(株)製の「PLACCEL CD208PL」、「PLACCEL CD210PL」、「PLACCEL CD220PL」、「PLACCEL CD208」、「PLACCEL CD210」、「PLACCEL CD220」、「PLACCEL CD208HL」、「PLACCEL CD210HL」、「PLACCEL CD220HL」などを挙げることができる。
【0013】
式(B1)で表されるジオイル構造を持つ化合物は、式中のR1 が炭素数34の環式または非環式の飽和炭化水素基からなるジカルボン酸またはその誘導体であり、上記のジカルボン酸としては、炭素数18の不飽和脂肪酸(工業的には、サフラワ―油、大豆油、亜麻仁油、ト―ル油などの油脂類から得られるリノ―ル酸を含有する不飽和脂肪酸)のダイマ―酸、つまり二量体からなる重合脂肪酸を、適宜の方法で飽和カルボン酸となるまで水素化してなる水添ダイマ―酸を挙げることができる。また、その誘導体としては、低級アルコ―ルやジオ―ルその他の多価アルコ―ルとのエステルなどを挙げることができる。
【0014】
式(B2)で表されるジオ―ル構造を持つ化合物は、式中のR2 が炭素数36の環式または非環式の飽和炭化水素基からなるジオ―ルまたはその誘導体であり、上記のジオ―ルとしては、前記の水添ダイマ―酸の両方のカルボキシル基を第1級アルコ―ル基となるまで還元してなる水添ダイマ―ジオ―ルが挙げられる。また、その誘導体としては、低級カルボン酸やジカルボン酸その他の多塩基酸とのエステルなどを挙げることができる。また、式(B1)で表されるジオイル構造と式(B2)で表されるジオ―ル構造との両方を持つ化合物には、上記の水添ダイマ―酸と上記の水添ダイマ―ジオ―ルとのエステルなどがある。
【0015】
これら以外の他のジオ―ル成分としては、エチレングリコ―ル、プロピレングリコ―ル、ブタンジオ―ル、ヘキサンジオ―ル、オクタンジオ―ル、デカンジオ―ル、オクタデカンジオ―ルなどの直鎖状のジオ―ルまたは分枝状のジオ―ルなどが挙げられる。これら他のジオ―ル成分はジオ―ル成分中50重量%以下とするのが好ましい。ポリエステルからなる縮合系重合体を高分子量化するために、3官能以上のポリオ―ル成分を少量添加することもできる。
【0016】
また、他のジカルボン酸成分としては、炭素数が2〜20の脂肪族または脂環式の炭化水素基を分子骨格としたジカルボン酸が挙げられる。上記の炭化水素基は直鎖状であつても、分枝状であつてもよい。具体的には、コハク酸、メチルコハク酸、アジピン酸、ピメリツク酸、アゼライン酸、セバシン酸、1,12−ドデカン二酸、1,14−テトラデカン二酸、テトラヒドロフタル酸、これらの酸無水物や低級アルキルエステルなどの誘導体が挙げられる。
【0017】
ポリウレタンからなる縮合系重合体は、原料成分として、上記の各化合物の中らジオ―ル成分のみを上記同様の組み合わせで使用し、これに必要により上記の他のジオ―ル成分を加えて、これらとヘキサメチレンジイソシアネ―ト、ジフエニルメタンジイソシアネ―トなどのジイソシアネ―トを主体とするポリイソシアネ―トとをウレタン化反応させることにより、得ることができる。
【0018】
本発明においては、このような縮合系重合体を適宜の手段で架橋することにより、粘着特性にすぐれた粘着剤組成物とすることができる。架橋手段としては、ポリイソシアネ―ト化合物、エポキシ化合物、アジリジン化合物などの縮合系重合体に含まれる水酸基やカルボキシル基と反応する基を有する化合物を加えて反応させる、いわゆる架橋剤を用いる方法が挙げられる。架橋剤の中でも、ポリイソシアネ―ト化合物がとくに好ましく用いられる。
【0019】
ポリイソシアネ―ト化合物としては、エチレンジイソシアネ―ト、ブチレンジイソシアネ―ト、ヘキサメチレンジイソシアネ―トなどの脂肪族ポリイソシアネ―ト類、シクロペンチレンジイソシアネ―ト、シクロヘキシレンジイソシアネ―ト、イソホロンジイソシアネ―トなどの脂環式イソシアネ―ト類、2,4−トリレンジイソシアネ―ト、ジフエニルメタンジイソシアネ―ト、キシレンジイソシアネ―トなどの芳香族ジイソシアネ―ト類、トリメチロ―ルプロパンのトリレンジイソシアネ―ト付加物やヘキサメチレンジイソシアネ―ト付加物などのイソシアネ―ト付加物などが挙げられる。これらのポリイソシアネ―ト化合物は、単独でまたは2種以上の混合系で使用される。使用量は、縮合系重合体100重量部に対して、通常1〜10重量部程度とするのがよい。
【0020】
本発明の粘着剤組成物は、上記の縮合系重合体を主成分とし、これを通常は上記のように架橋処理してなり、これには必要により従来公知の各種の粘着付与剤を配合してもよく、さらに無機または有機の充填剤、金属粉、顔料などの粉体、粒子状、箔状物などの各種の添加剤を配合することもできる。
【0021】
本発明の粘着シ―ト類は、ポリエステルフイルムなどのプラスチツクフイルム、不織布、紙などを支持体とし、この支持体の片面または両面に上記の粘着剤組成物からなる層、とくに前記のように架橋処理した層を、片面で約10〜150μmの厚さに設けて、シ―ト状やテ―プ状などの形態としたものであり、上記層からなる粘着面には通常剥離ライナが貼り合わされる。
【0022】
この剥離ライナには、シリコ─ン処理を施していない剥離ライナを使用でき、とくにポリオレフイン系フイルムが好ましく用いられる。ポリオレフイン系フイルムとしては、ポリエチレン、ポリプロピレン、ポリメチルペンテン、エチレン−プロピレン共重合体またはこれらの混合物からなるフイルムのほか、表面が上記同様のポリオレフインにより加工されたフイルム(たとえば、上記ポリオレフイルムと紙類や他のフイルムとの積層フイルム)などが用いられる。
【0023】
このように構成される本発明の粘着シ―ト類は、上記の粘着剤組成物からなる層が、式(A)で表される特定のポリカ―ボネ―ト構造とともに、式(B1),(B2)で表される特定の環式または非環式のジオイルないしジオ―ル構造を持つ縮合系重合体を主成分としていることにより、改善された初期粘着性を示す。また、本来の粘着力が大きく、かつ粘着面に貼り合わせた前記ポリオレフイン系フイルムからなるシリコ─ン処理を施していない剥離ライナの剥離性にもすぐれており、使用に際して小さな力で容易に剥離できる。
【0024】
なお、付言すると、特開平8−41185号公報には、ダイマ―脂肪酸とダイマ―脂肪酸ジオ―ルとのポリエステルを含むポリエステルカ―ボネ―トが開示されている。しかし、このポリエステルカ―ボネ―トは、自動車の車体製造における芳香族系ポリカ―ボネ―ト材料として、その耐燃料油性および透明性を改善することを目的としており、本発明のような脂肪族ポリカ―ボネ―ト構造を有する縮合系重合体をベ―スとしたものとは大きく異なり、上記カ―ボネ―ト材料を粘着剤に用いるとの記載もこれを示唆する記載もない。よつて、上記公報の存在が本発明の新規性や進歩性になんら影響を与えるものではない。
【0025】
【実施例】
つぎに、本発明の実施例を記載して、より具体的に説明する。ただし、本発明の範囲は以下の実施例によりなんら制限を受けるものではない。なお、以下において、部とあるのは重量部を意味するものとする。
【0026】
実施例1
四つ口セパラブルフラスコに攪拌機、温度計および水分離管を付し、これにポリカ―ボネ―トジオ―ル〔ダイセル化学工業(株)製の「PLACCEL CD220PL」、水酸基価:55.1KOHmg/g〕300g、水添ダイマ―酸(Unichema社製の「Pripol 1010」、酸価192.6KOHmg/g)87.5g、触媒としてテトライソプロピルチタネ―ト(以下、TPTという)80mgを仕込み、反応水排出溶剤としての少量のキシレンの存在下、攪拌を開始しながら180℃まで昇温し、この温度で保持した。しばらくすると、水の流出分離が認められ、反応が進行し始めた。約16時間反応を続けて、重量平均分子量が28,000のポリエステルを得た。
【0027】
このポリエステルをトルエンで固形分濃度50重量%に希釈した。このポリエステル100部(固形分)に、架橋剤としてトリメチロ―ルプロパンのヘキサメチレンジイソシアネ―ト付加物〔日本ポリウレタン(株)製の「コロネ―トHL」〕3部(固形分)を加えて、粘着剤組成物とした。これを、アプリケ―タにより、厚さが38μmのポリエチレンテレフタレ―トフイルム(以下、PETフイルムという)上に塗布したのち、130℃で5分間乾燥して、厚さが50μmの粘着剤組成物からなる層を形成した。粘着面に剥離ライナとして厚さが60μmのポリエチレンフイルムを貼り合わせ、アフタ―キユアとして50℃の雰囲気中で3日間のエ―ジングを行い、粘着テ―プを作製した。
【0028】
実施例2
四つ口セパラブルフラスコに攪拌機、温度計および水分離管を付し、これにポリカ―ボネ―トジオ―ル〔ダイセル化学工業(株)製の「PLACCEL CD220PL」、水酸基価:55.1KOHmg/g〕320g 、水添ダイマ―ジオ―ル〔東亜合成(株)製の「ペスポ―ルHP−1000」、水酸基価:200KOHmg/g〕80g、セバシン酸61.2g 、触媒としてTPT80mgを仕込み、反応水排出溶剤としての少量のキシレンの存在下、攪拌を開始しながら180℃まで昇温し、この温度で保持した。しばらくすると、水の流出分離が認められ、反応が進行し始めた。約24時間反応を続けて、重量平均分子量が49,000のポリエステルを得た。
【0029】
このポリエステルをトルエンで固形分濃度50重量%に希釈した。このポリエステル100部(固形分)に、架橋剤としてトリメチロ―ルプロパンのトリレンジイソシアネ―ト付加物〔日本ポリウレタン(株)製の「コロネ―トL」〕2部(固形分)を加えて、粘着剤組成物とした。これを、アプリケ―タにより、厚さが38μmのPETフイルム上に塗布したのち、130℃で5分間乾燥して、厚さが50μmの粘着剤組成物からなる層を形成した。粘着面に剥離ライナとして厚さが60μmのポリエチレンフイルムを貼り合わせ、アフタ―キユアとして50℃の雰囲気中で3日間のエ―ジングを行い、粘着テ―プを作製した。
【0030】
実施例3
四つ口セパラブルフラスコに攪拌機、温度計および水分離管を付し、これにポリカ―ボネ―トジオ―ル〔ダイセル化学工業(株)製の「PLACCEL CD210PL」、水酸基価:115KOHmg/g〕320g 、水添ダイマ―酸とヘキサンジオ―ルとのエステル化合物〔東亜合成(株)製の「ペスポ―ル601」、水酸基価:53.3KOHmg/g〕80g、セバシン酸74.8g、触媒としてTPT80mgを仕込み、反応水排出溶剤としての少量のキシレンの存在下、攪拌を開始しながら180℃まで昇温し、この温度で保持した。しばらくすると、水の流出分離が認められ、反応が進行し始めた。約25時間反応を続けて、重量平均分子量が72,000のポリエステルを得た。
【0031】
このポリエステルをトルエンで固形分濃度50重量%に希釈した。このポリエステル100部(固形分)に、架橋剤としてトリメチロ―ルプロパンのヘキサメチレンジイソシアネ―ト付加物〔日本ポリウレタン(株)製の「コロネ―トHL」〕2部(固形分)を加えて、粘着剤組成物とした。これを、アプリケ―タ―により、厚さが38μmのPETフイルム上に塗布し、130℃で5分間乾燥して、厚さが50μmの粘着剤組成物からなる層を形成した。粘着面に剥離ライナとして厚さが60μmのポリエチレンフイルムを貼り合わせ、アフタ―キユアとして50℃の雰囲気中で3日間のエ―ジングを行い、粘着テ―プを作製した。
【0032】
実施例4
四つ口セパラブルフラスコに攪拌機、温度計および水分離管を付し、これにポリカ―ボネ―トジオ―ル〔ダイセル化学工業(株)製の「PLACCEL CD220PL」、水酸基価:55.1KOHmg/g〕320g 、水添ダイマ―酸と水添ダイマ―ジオ―ルとのエステル化合物〔東亜合成(株)製の「ペスポ―ル801」、水酸基価:52.7KOHmg/g〕80g、アゼライン酸36.4g 、触媒としてTPT80mgを仕込み、反応水排出溶剤としての少量のキシレンの存在下、攪拌を開始しながら180℃まで昇温し、この温度で保持した。しばらくすると、水の流出分離が認められ、反応が進行し始めた。約25時間反応を続けて、重量平均分子量が76,000のポリエステルを得た。
【0033】
このポリエステルをトルエンで固形分濃度50重量%に希釈した。このポリエステル100部(固形分)に、架橋剤としてトリメチロ―ルプロパンのヘキサメチレンジイソシアネ―ト付加物〔日本ポリウレタン(株)製の「コロネ―トHL」〕2部(固形分)を加えて、粘着剤組成物とした。これを、アプリケ―タ―により、厚さが38μmのPETフイルム上に塗布し、130℃で5分間乾燥して、厚さが50μmの粘着剤組成物からなる層を形成した。粘着面に剥離ライナとして厚さが60μmのポリエチレンフイルムを貼り合わせ、アフタ―キユアとして50℃の雰囲気中で3日間のエ―ジングを行い、粘着テ―プを作製した。
【0034】
実施例5
四つ口セパラブルフラスコに攪拌機、温度計およびコンデンサを付し、これにポリカ―ボネ―トジオ―ル〔ダイセル化学工業(株)製の「PLACCEL CD210PL」、水酸基価:115KOHmg/g〕200g 、水添ダイマ―酸とヘキサンジオ―ルとのエステル化合物〔東亜合成(株)製の「ペスポ―ル601」、水酸基価:53.3KOHmg/g〕200g 、ジフエニルメタンジイソシアネ―ト75g 、トルエン100g 、触媒としてTPT80mgを仕込み、100℃まで昇温し、約8時間反応を続けて、重量平均分子量が26,000のポリウレタンを得た。
【0035】
このポリウレタンをトルエンで固形分濃度50重量%に希釈した。このポリウレタン100部(固形分)に、架橋剤としてトリメチロ―ルプロパンのトリレンジイソシアネ―ト付加物〔日本ポリウレタン(株)製の「コロネ―トL」〕2部(固形分)を加えて、粘着剤組成物とした。これを、アプリケ―タにより、厚さが38μmのPETフイルム上に塗布し、130℃で5分間乾燥して、厚さが50μmの粘着剤組成物からなる層を形成した。粘着面に剥離ライナとして厚さが60μmのポリエチレンフイルムを貼り合わせ、アフタ―キユアとして50℃の雰囲気中で3日間のエ―ジングを行い、粘着テ―プを作製した。
【0036】
比較例1
四つ口セパラブルフラスコに攪拌機、温度計および水分離管を付し、これにポリカ―ボネ―トジオ―ル〔ダイセル化学工業(株)製の「PLACCEL CD220PL」、水酸基価:55.1KOHmg/g〕300g 、セバシン酸30g 、触媒としてTPT80mgを仕込み、反応水排出溶剤としての少量のキシレンの存在下、攪拌を開始しながら180℃まで昇温し、この温度で保持した。しばらくすると、水の流出分離が認められ、反応が進行し始めた。約16時間反応を続けて、重量平均分子量が37,000のポリエステルを得た。
【0037】
このポリエステルをトルエンで固形分濃度50重量%に希釈した。このポリエステル100部(固形分)に、架橋剤としてトリメチロ―ルプロパンのヘキサメチレンジイソシアネ―ト付加物〔日本ポリウレタン(株)製の「コロネ―トHL」〕3部(固形分)を加えて、粘着剤組成物とした。これを、アプリケ―タにより、厚さが38μmのPETフイルム上に塗布し、130℃で5分間乾燥して、厚さが50μmの粘着剤組成物からなる層を形成した。粘着面に剥離ライナとして厚さが60μmのポリエチレンフイルムを貼り合わせ、アフタ―キユアとして50℃の雰囲気中で3日間のエ―ジングを行い、粘着テ―プを作製した。
【0038】
比較例2
四つ口セパラブルフラスコに攪拌機、温度計および水分離管を付し、これに水添ダイマ―ジオ―ル〔東亜合成(株)製の「ペスポ―ルHP−1000」、水酸基価:200KOHmg/g〕300g 、セバシン酸109g 、触媒としてTPT80mgを仕込み、反応水排出溶剤としての少量のキシレンの存在下、攪拌を開始しながら180℃まで昇温し、この温度で保持した。しばらくすると、水の流出分離が認められ、反応が進行し始めた。約24時間反応を続けて、重量平均分子量が29,000のポリエステルを得た。
【0039】
このポリエステルをトルエンで固形分濃度50重量%に希釈した。このポリエステル100部(固形分)に、架橋剤としてトリメチロ―ルプロパンのトリレンジイソシアネ―ト付加物〔日本ポリウレタン(株)製の「コロネ―トL」〕2部(固形分)を加えて、粘着剤組成物とした。これを、アプリケ―タにより、厚さが38μmのPETフイルム上に塗布し、130℃で5分間乾燥して、厚さが50μmの粘着剤組成物からなる層を形成した。粘着面に剥離ライナとして厚さが60μmのポリエチレンフイルムを貼り合わせ、アフタ―キユアとして50℃の雰囲気中で3日間のエ―ジングを行い、粘着テ―プを作製した。
【0040】
上記の実施例1〜5および比較例1,2の各粘着テ―プについて、以下の要領により、初期粘着力、粘着力および剥離ライナの剥離力を測定した。これらの結果は、後記の表1に示されるとおりであつた。
【0041】
<初期粘着力の測定>
被着体として、アルミ板、アクリル(ポリメチルメタクリレ―ト)板を用い、粘着テ―プ(20mm×100mm)を200g ロ―ラで貼り付けたのち、雰囲気温度23℃、貼付時間10秒、剥離速度300mm/分の条件で、万能引張試験機により、180゜剥離粘着力を測定した。
【0042】
<粘着力の測定>
被着体として、アルミ板、アクリル(ポリメチルメタクリレ―ト)板を用い、粘着テ―プ(20mm×100mm)を2kgロ―ラで貼り付けたのち、雰囲気温度23℃、貼付時間30分、剥離速度300mm/分の条件で、万能引張試験機により、180゜剥離粘着力を測定した。
【0043】
<剥離ライナの剥離力の測定>
雰囲気温度23℃、剥離角度180゜、剥離速度300mm/分の条件で、万能引張試験機により、粘着面に貼り合わせた剥離ライナの剥離力を測定した。
【0044】

Figure 0004162286
【0045】
上記の表1の結果から明らかなように、本発明の実施例1〜5の各粘着テ―プは、粘着力および剥離ライナの剥離性にすぐれるとともに、初期粘着性の点でもすぐれていることがわかる。これに対して、比較例1の粘着テ―プは、粘着力および剥離ライナの剥離性にはすぐれているが、初期粘着性に劣つており、また、比較例2の粘着テ―プでは、初期粘着性にすぐれているが、粘着力がやや低く、そのうえ剥離ライナの剥離性に劣つている。
【0046】
【発明の効果】
以上のように、本発明は、特定のポリカ―ボネ―ト構造とともに、環式または非環式の特定のジオイルないしジオ―ル構造を持つ縮合系重合体を主成分としたことにより、粘着力が大きく、かつシリコ─ン処理を施していない剥離ライナの剥離性にすぐれるとともに、初期粘着性の改善された粘着剤組成物とその粘着シ―ト類を提供することができ、これらは、シリコンの存在を好まない電子機器用途などのほか、瞬間的な接着が必要な高速連続接着作業や接着後直ちに応力がかかるような用途などに対しても、十分に使用することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure-sensitive adhesive composition containing a condensation polymer such as polyester as a main component, and a pressure-sensitive adhesive sheet thereof.
[0002]
[Prior art]
As a pressure-sensitive adhesive composition containing a condensation polymer as a main component, for example, Japanese Patent Application Laid-Open No. 9-263737 discloses a pressure-sensitive adhesive composition containing a polyester containing a polycarbonate structure as a main component. This type of pressure-sensitive adhesive composition is basically highly elastic at room temperature, non-adhesive or low-adhesive (tack-free), and has the advantage that it is difficult to inadvertently adhere to parts other than the target due to this property. ing.
[0003]
The adhesive tape has a release liner bonded to the adhesive surface from the viewpoint of protecting the adhesive surface or handling. As the release liner, acrylic film or rubber-based adhesive tape uses a plastic film whose surface has been subjected to a silicone treatment in order to obtain good release properties. In the adhesive tape using the adhesive composition containing as a main component, a sufficiently good release property can be obtained even when a release liner made of polyolefin film or the like and not subjected to a silicone treatment is used. With such a release liner that has not been treated with silicon, there is no concern about the transfer of silicon to the adhesive surface, and it can be used without any problems for applications that do not like the presence of silicon. Has advantages.
[0004]
[Problems to be solved by the invention]
However, the known pressure-sensitive adhesive composition mainly composed of a condensation polymer such as polyester containing a polycarbonate structure has the above-mentioned advantages, but it is used for applications that require instantaneous bonding, for example, high-speed continuous bonding work. In applications where stress is applied immediately after bonding, the initial tackiness is poor, so it cannot be used.
[0005]
In view of such circumstances, the present invention is a pressure-sensitive adhesive composition containing a condensation polymer as a main component, and has good peelability even when a release liner that has high adhesive strength and is not subjected to a silicon treatment is used. In addition, the present invention has an object to provide a pressure-sensitive adhesive composition having improved initial tackiness and a pressure-sensitive adhesive sheet thereof.
[0006]
[Means for Solving the Problems]
As a result of diligent studies to achieve the above object, the present inventors have found that aliphatic diols having a polycarbonate structure are used as raw material components in obtaining condensation polymers such as polyester and polyurethane. When hydrogenated dimer acid formed by hydrogenating dimer acid of unsaturated fatty acid having 18 carbon atoms such as linoleic acid or hydrogenated dimer diol obtained by reducing the dicarboxylic acid is used together with dicarboxylic acid, A condensation polymer having a specific polycarbonate structure and a cyclic or acyclic specific dioil or diol structure derived from the above dimer acid or hydrogenated dimer diol is obtained, According to this, it was found that a pressure-sensitive adhesive composition having a high adhesive force and exhibiting good peelability even for a release liner not subjected to silicon treatment and having improved initial tackiness was obtained. The present invention Those were Itaritsu to be formed.
[0007]
That is, the present invention provides a) the following formula (A);
-(O-R-O-C) n-
‖… (A)
O
(R is a linear or branched aliphatic hydrocarbon group having 2 to 20 carbon atoms)
And b) the following formula (B1);
-C-R 1 -C-
‖ ‖… (B1)
O O
(R 1 is a cyclic or acyclic saturated hydrocarbon group having 34 carbon atoms)
Or the following formula (B2):
—O—R 2 —O— (B2)
(R 2 is a C36 cyclic or acyclic saturated hydrocarbon group)
A pressure-sensitive adhesive composition comprising a condensation polymer having at least one of the structures represented by the formula (Claim 1), and particularly represented by the formula (B1). The structure is derived from a hydrogenated dimer acid obtained by hydrogenating a dimer acid of an unsaturated fatty acid having 18 carbon atoms, and the structure represented by the above formula (B2) reduces the above hydrogenated dimer acid. Thus, a pressure-sensitive adhesive composition having the above-described structure, which is derived from a hydrogenated dimmer diol (claim 2), can be provided.
[0008]
The present invention also provides a sheet or tape-like pressure-sensitive adhesive sheet or tape having a layer composed of the pressure-sensitive adhesive composition having the above structure on one side or both sides of a support. It relates to a tape (Claim 3), and in particular, an adhesive sheet or tape (Claim 4) having the above structure in which a release liner that has not been subjected to a silicone treatment is bonded to the adhesive surface. It is possible to provide an adhesive sheet or tape having the above structure, in which the release liner that has not been treated is a polyolefin film comprising polyethylene, polypropylene, ethylene-propylene copolymer, or the like.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The condensation polymer used in the present invention has a polycarbonate structure represented by the above formula (A) as the structure of the a component and is represented by the above formula (B1) as the structure of the b component. A structure having at least one of a cyclic or acyclic dioil structure and a cyclic or acyclic diol structure represented by the formula (B2), As long as it has the structure of both components, the condensation form is not limited. The most typical one is polyester, and other examples include polyurethane, a mixture or co-condensate of this with polyester, and the like.
[0010]
The condensation polymer composed of polyester is represented by the formula (B1) together with a compound having a polycarbonate structure represented by the formula (A) as a raw material component comprising a dicarboxylic acid component and a diol component. A compound having a dioil structure, a compound having a diol structure represented by formula (B2), and having both a diol oil structure represented by formula (B1) and a diol structure represented by formula (B2) It can be obtained by using at least one of the compounds, adding a dicarboxylic acid component or a diol component other than these if necessary, and carrying out an esterification reaction by a conventional method. In the esterification reaction, the diol component and the dicarboxylic acid component are preferably equimolar reactions, but either one may be used in excess to promote the esterification reaction.
[0011]
The compound having a polycarbonate structure represented by the formula (A) includes a diol in which R is a linear or branched aliphatic hydrocarbon group having 2 to 20 carbon atoms, There are derivatives such as dicarboxylic acids and their lower alkyl esters. Of these, diols are readily available as commercial products and are particularly preferably used. Specifically, polyhexamethylene carbonate diol, poly (3-methylpentene carbonate) diol, poly (2-methyloctane) diol, polypropylene carbonate diol And their mixtures and copolymers.
[0012]
Examples of such commercially available diols include “PLACCEL CD208PL”, “PLACCEL CD210PL”, “PLACCEL CD220PL”, “PLACCEL CD208”, “PLACCEL CD210”, “PLACCEL CD220” manufactured by Daicel Chemical Industries, Ltd. ”,“ PLACCEL CD208HL ”,“ PLACCEL CD210HL ”,“ PLACCEL CD220HL ”, and the like.
[0013]
The compound having a dioil structure represented by the formula (B1) is a dicarboxylic acid or derivative thereof in which R 1 is a cyclic or acyclic saturated hydrocarbon group having 34 carbon atoms, and the above dicarboxylic acid As a dimer of an unsaturated fatty acid having 18 carbon atoms (industrially, an unsaturated fatty acid containing linoleic acid obtained from fats and oils such as safflower oil, soybean oil, linseed oil and tall oil) -A hydrogenated dimer acid obtained by hydrogenating a polymerized fatty acid composed of an acid, that is, a dimer, to a saturated carboxylic acid by an appropriate method can be mentioned. Examples of the derivatives include esters with lower alcohols, diols, and other polyhydric alcohols.
[0014]
The compound having a diol structure represented by the formula (B2) is a diol or derivative thereof in which R 2 is a cyclic or acyclic saturated hydrocarbon group having 36 carbon atoms, Examples of the diol include a hydrogenated dimer diol obtained by reducing both carboxyl groups of the hydrogenated dimer acid to a primary alcohol group. Examples of the derivatives include esters with lower carboxylic acids, dicarboxylic acids and other polybasic acids. In addition, the compound having both the dioil structure represented by the formula (B1) and the diol structure represented by the formula (B2) includes the hydrogenated dimer acid and the hydrogenated dimer geo- Ester and the like.
[0015]
Other diol components other than these include linear diols such as ethylene glycol, propylene glycol, butane diol, hexane diol, octane diol, decane diol, and octadecane diol. Or branched diols. These other diol components are preferably 50% by weight or less in the diol component. In order to increase the molecular weight of the condensation polymer made of polyester, a small amount of a tri- or higher functional polyol component can be added.
[0016]
Examples of other dicarboxylic acid components include dicarboxylic acids having a molecular skeleton of an aliphatic or alicyclic hydrocarbon group having 2 to 20 carbon atoms. The hydrocarbon group may be linear or branched. Specifically, succinic acid, methyl succinic acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, 1,12-dodecanedioic acid, 1,14-tetradecanedioic acid, tetrahydrophthalic acid, their acid anhydrides and lower Derivatives such as alkyl esters are mentioned.
[0017]
The condensation polymer composed of polyurethane uses only the diol component of the above compounds as a raw material component in the same combination as described above, and if necessary, adds the other diol component as described above. These can be obtained by urethanizing a polyisocyanate mainly composed of diisocyanate such as hexamethylene diisocyanate or diphenylmethane diisocyanate.
[0018]
In this invention, it can be set as the adhesive composition excellent in the adhesive characteristic by bridge | crosslinking such a condensation type polymer by a suitable means. Examples of the crosslinking means include a method using a so-called crosslinking agent in which a compound having a group that reacts with a hydroxyl group or a carboxyl group contained in a condensation polymer such as a polyisocyanate compound, an epoxy compound, or an aziridine compound is added and reacted. . Of the crosslinking agents, polyisocyanate compounds are particularly preferably used.
[0019]
Examples of the polyisocyanate compound include aliphatic polyisocyanates such as ethylene diisocyanate, butylene diisocyanate, and hexamethylene diisocyanate, cyclopentylene diisocyanate, and cyclohexylene diisocyanate. -Cycloaliphatic isocyanates such as isophorone diisocyanate, aromatic diisocyanates such as 2,4-tolylene diisocyanate, diphenylmethane diisocyanate, xylene diisocyanate -Toluene diisocyanate adduct of trimethylolpropane and isocyanate adducts such as hexamethylene diisocyanate adduct. These polyisocyanate compounds are used alone or in a mixture of two or more. The amount used is usually about 1 to 10 parts by weight per 100 parts by weight of the condensation polymer.
[0020]
The pressure-sensitive adhesive composition of the present invention comprises the above condensation polymer as a main component and is usually subjected to a crosslinking treatment as described above, and if necessary, various conventionally known tackifiers may be blended therein. In addition, various additives such as inorganic or organic fillers, powders such as metal powders and pigments, particulates, and foils can also be blended.
[0021]
The pressure-sensitive adhesive sheet of the present invention comprises a support made of a plastic film such as a polyester film, a non-woven fabric, paper or the like, and a layer formed of the above-mentioned pressure-sensitive adhesive composition on one or both sides of the support, particularly as described above. The treated layer is provided with a thickness of about 10 to 150 μm on one side so as to have a sheet-like or tape-like form, and a release liner is usually bonded to the adhesive surface consisting of the above layers. The
[0022]
As this release liner, a release liner that has not been subjected to silicon treatment can be used, and in particular, a polyolefin-based film is preferably used. Polyolefin films include polyethylene, polypropylene, polymethylpentene, ethylene-propylene copolymers or mixtures thereof, as well as films whose surfaces are processed with the same polyolefin as described above (for example, the above-mentioned polyolefin film and paper). And laminated films with other films).
[0023]
The pressure-sensitive adhesive sheet of the present invention constituted as described above has a layer composed of the above-mentioned pressure-sensitive adhesive composition, together with a specific polycarbonate structure represented by the formula (A), the formula (B1), By using a condensation polymer having a specific cyclic or acyclic dioil or diol structure represented by (B2) as a main component, improved initial tackiness is exhibited. In addition, the peel strength of the release liner made of the polyolefin film that has been applied to the adhesive surface and not treated with silicone is excellent, and it can be easily peeled off with little force when used. .
[0024]
In addition, Japanese Patent Application Laid-Open No. 8-41185 discloses a polyester carbonate containing a polyester of dimer fatty acid and dimer fatty acid polyol. However, this polyester carbonate is an aromatic polycarbonate material for the production of automobile bodies, and is intended to improve its fuel oil resistance and transparency. It is significantly different from those based on a condensation polymer having a polycarbonate structure, and there is no description or suggestion of using the above-mentioned polycarbonate material as an adhesive. Therefore, the existence of the above publication does not affect the novelty or inventive step of the present invention.
[0025]
【Example】
Next, examples of the present invention will be described in more detail. However, the scope of the present invention is not limited by the following examples. In the following, “parts” means parts by weight.
[0026]
Example 1
A four-neck separable flask was equipped with a stirrer, a thermometer and a water separation tube. Polycarbonate diol ("PLACCEL CD220PL" manufactured by Daicel Chemical Industries, Ltd., hydroxyl value: 55.1 KOHmg / g) ] 300 g, hydrogenated dimer acid ("Pripol 1010" manufactured by Unichema, acid value 192.6 KOH mg / g) 87.5 g, tetraisopropyl titanate (hereinafter referred to as TPT) 80 mg as a catalyst, and reaction water In the presence of a small amount of xylene as a discharge solvent, the temperature was raised to 180 ° C. while stirring was started, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 16 hours to obtain a polyester having a weight average molecular weight of 28,000.
[0027]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 3 parts (solid content) of hexamethylene diisocyanate adduct of trimethylolpropane ["Colonate HL" manufactured by Nippon Polyurethane Co., Ltd.] as a crosslinking agent. A pressure-sensitive adhesive composition was obtained. This was coated on a polyethylene terephthalate film (hereinafter referred to as PET film) having a thickness of 38 μm by an applicator, and then dried at 130 ° C. for 5 minutes, from the pressure-sensitive adhesive composition having a thickness of 50 μm. A layer was formed. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0028]
Example 2
A four-neck separable flask was equipped with a stirrer, a thermometer and a water separation tube. Polycarbonate diol ("PLACCEL CD220PL" manufactured by Daicel Chemical Industries, Ltd., hydroxyl value: 55.1 KOHmg / g) ] 320 g, hydrogenated dimer diol [“PESPOL HP-1000” manufactured by Toa Gosei Co., Ltd., hydroxyl value: 200 KOH mg / g] 80 g, sebacic acid 61.2 g, TPT 80 mg as catalyst, charged with reaction water In the presence of a small amount of xylene as a discharge solvent, the temperature was raised to 180 ° C. while stirring was started, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 24 hours to obtain a polyester having a weight average molecular weight of 49,000.
[0029]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 2 parts (solid content) of a tolylene diisocyanate adduct of trimethylolpropane (“Coronate L” manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent, It was set as the adhesive composition. This was coated on a PET film having a thickness of 38 μm by an applicator and then dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0030]
Example 3
A four-necked separable flask was equipped with a stirrer, thermometer and water separation tube. Polycarbonate diol ("PLACCEL CD210PL" manufactured by Daicel Chemical Industries, hydroxyl value: 115 KOHmg / g) 320 g 80 g of an ester compound of hydrogenated dimer acid and hexanediol [“PESPOL 601” manufactured by Toagosei Co., Ltd., hydroxyl value: 53.3 KOH mg / g], 74.8 g of sebacic acid, 80 mg of TPT as a catalyst In the presence of a small amount of xylene as a reaction water discharge solvent, the temperature was raised to 180 ° C. while stirring was started, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 25 hours to obtain a polyester having a weight average molecular weight of 72,000.
[0031]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 2 parts (solid content) of hexamethylene diisocyanate adduct of trimethylolpropane (“Coronate HL” manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent. A pressure-sensitive adhesive composition was obtained. This was applied onto a PET film having a thickness of 38 μm by an applicator and dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0032]
Example 4
A four-neck separable flask was equipped with a stirrer, a thermometer and a water separation tube. Polycarbonate diol ("PLACCEL CD220PL" manufactured by Daicel Chemical Industries, Ltd., hydroxyl value: 55.1 KOHmg / g) ] 320 g, ester compound of hydrogenated dimer acid and hydrogenated dimer diol [“PESPOL 801” manufactured by Toagosei Co., Ltd., hydroxyl value: 52.7 KOHmg / g] 80 g, azelaic acid 36. 4 g of TPT (80 mg) was charged as a catalyst, and the temperature was raised to 180 ° C. while stirring was started in the presence of a small amount of xylene as a reaction water discharge solvent, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 25 hours to obtain a polyester having a weight average molecular weight of 76,000.
[0033]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 2 parts (solid content) of hexamethylene diisocyanate adduct of trimethylolpropane (“Coronate HL” manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent. A pressure-sensitive adhesive composition was obtained. This was applied onto a PET film having a thickness of 38 μm by an applicator and dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0034]
Example 5
A four-neck separable flask was equipped with a stirrer, a thermometer and a condenser. Polycarbonate diol ("PLACCEL CD210PL" manufactured by Daicel Chemical Industries, Ltd., hydroxyl value: 115 KOHmg / g) 200 g, water 200 g of ester compound of dimer acid and hexanediol [“PESPOL 601” manufactured by Toa Gosei Co., Ltd., hydroxyl value: 53.3 KOH mg / g], 75 g of diphenylmethane diisocyanate, 100 g of toluene Then, 80 mg of TPT was charged as a catalyst, the temperature was raised to 100 ° C., and the reaction was continued for about 8 hours to obtain a polyurethane having a weight average molecular weight of 26,000.
[0035]
This polyurethane was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyurethane was added 2 parts (solid content) of a tolylene diisocyanate adduct of trimethylolpropane ("Colone L" manufactured by Nippon Polyurethane Co., Ltd.) as a cross-linking agent. It was set as the adhesive composition. This was applied onto a PET film having a thickness of 38 μm by an applicator and dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0036]
Comparative Example 1
A four-neck separable flask was equipped with a stirrer, a thermometer and a water separation tube. Polycarbonate diol ("PLACCEL CD220PL" manufactured by Daicel Chemical Industries, Ltd., hydroxyl value: 55.1 KOHmg / g) 300 g, 30 g of sebacic acid, 80 mg of TPT as a catalyst were added, and the temperature was raised to 180 ° C. while stirring was started in the presence of a small amount of xylene as a reaction water discharge solvent, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 16 hours to obtain a polyester having a weight average molecular weight of 37,000.
[0037]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 3 parts (solid content) of hexamethylene diisocyanate adduct of trimethylolpropane ["Colonate HL" manufactured by Nippon Polyurethane Co., Ltd.] as a crosslinking agent. A pressure-sensitive adhesive composition was obtained. This was applied onto a PET film having a thickness of 38 μm by an applicator and dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0038]
Comparative Example 2
A four-necked separable flask was equipped with a stirrer, a thermometer and a water separation tube. Hydrogenated dimer diol ["Pespoor HP-1000" manufactured by Toa Gosei Co., Ltd., hydroxyl value: 200 KOHmg / g] 300 g, 109 g of sebacic acid, 80 mg of TPT as a catalyst were charged, and the temperature was raised to 180 ° C. while stirring was started in the presence of a small amount of xylene as a reaction water discharge solvent, and this temperature was maintained. After a while, water separation was observed and the reaction started to proceed. The reaction was continued for about 24 hours to obtain a polyester having a weight average molecular weight of 29,000.
[0039]
This polyester was diluted with toluene to a solid concentration of 50% by weight. To 100 parts (solid content) of this polyester, add 2 parts (solid content) of a tolylene diisocyanate adduct of trimethylolpropane (“Coronate L” manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent, It was set as the adhesive composition. This was applied onto a PET film having a thickness of 38 μm by an applicator and dried at 130 ° C. for 5 minutes to form a layer made of an adhesive composition having a thickness of 50 μm. A polyethylene film having a thickness of 60 μm was pasted to the adhesive surface as a release liner, and after-waxing was performed in an atmosphere at 50 ° C. for 3 days to prepare an adhesive tape.
[0040]
For each of the adhesive tapes of Examples 1 to 5 and Comparative Examples 1 and 2, the initial adhesive force, the adhesive force, and the release force of the release liner were measured in the following manner. These results were as shown in Table 1 below.
[0041]
<Measurement of initial adhesive strength>
As the adherend, an aluminum plate and an acrylic (polymethyl methacrylate) plate were used, and an adhesive tape (20 mm × 100 mm) was pasted with a 200 g roller, and then the ambient temperature was 23 ° C. and the pasting time was 10 seconds. The 180 ° peel adhesion was measured with a universal tensile tester under the condition of a peel speed of 300 mm / min.
[0042]
<Measurement of adhesive strength>
Using an aluminum plate and an acrylic (polymethylmethacrylate) plate as the adherend, affixing an adhesive tape (20 mm x 100 mm) with a 2 kg roller, an ambient temperature of 23 ° C and a pasting time of 30 minutes The 180 ° peel adhesion was measured with a universal tensile tester under the condition of a peel speed of 300 mm / min.
[0043]
<Measurement of peeling force of peeling liner>
The peeling force of the peeling liner bonded to the adhesive surface was measured with a universal tensile tester under the conditions of an atmospheric temperature of 23 ° C., a peeling angle of 180 °, and a peeling speed of 300 mm / min.
[0044]
Figure 0004162286
[0045]
As is clear from the results of Table 1 above, each of the adhesive tapes of Examples 1 to 5 of the present invention is excellent in adhesive strength and peelability of the release liner, as well as in initial tackiness. I understand that. On the other hand, the adhesive tape of Comparative Example 1 is excellent in the adhesive strength and the peelability of the release liner, but is inferior in the initial adhesiveness. In the adhesive tape of Comparative Example 2, Although it has excellent initial tackiness, the tackiness is somewhat low, and the peelability of the release liner is inferior.
[0046]
【The invention's effect】
As described above, the present invention is mainly composed of a condensed polymer having a specific polycarbonate structure and a cyclic or acyclic specific dioil or diol structure as a main component. In addition, it is possible to provide a pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet with improved initial adhesiveness as well as excellent release properties of a release liner that is large and not subjected to silicon treatment. In addition to electronic equipment applications that do not like the presence of silicon, it can be sufficiently used for high-speed continuous bonding operations that require instantaneous bonding or applications that are stressed immediately after bonding.

Claims (5)

a)つぎの式(A);
−(O−R−O−C)n−
‖ … (A)

(Rは炭素数2〜20の直鎖状または分枝状の脂肪族炭化水素基である)
で表される構造とともに、b)つぎの式(B1);
−C−R1 −C−
‖ ‖ … (B1)
O O
(R1 は炭素数34の環式または非環式の飽和炭化水素基である)
で表される構造か、つぎの式(B2);
−O−R2 −O− … (B2)
(R2 は炭素数36の環式または非環式の飽和炭化水素基である)
で表される構造かのいずれか少なくとも一方の構造を持つ縮合系重合体を含むことを特徴とする粘着剤組成物。
a) The following formula (A);
-(O-R-O-C) n-
‖… (A)
O
(R is a linear or branched aliphatic hydrocarbon group having 2 to 20 carbon atoms)
And b) the following formula (B1);
-C-R 1 -C-
‖ ‖… (B1)
O O
(R 1 is a cyclic or acyclic saturated hydrocarbon group having 34 carbon atoms)
Or the following formula (B2):
—O—R 2 —O— (B2)
(R 2 is a C36 cyclic or acyclic saturated hydrocarbon group)
A pressure-sensitive adhesive composition comprising a condensation polymer having at least one of the structures represented by:
式(B1)で表される構造が、炭素数18の不飽和脂肪酸のダイマ―酸を水素化してなる水添ダイマ―酸に由来し、式(B2)で表される構造が、上記の水添ダイマ―酸を還元してなる水添ダイマ―ジオ―ルに由来する請求項1に記載の粘着剤組成物。  The structure represented by the formula (B1) is derived from a hydrogenated dimer acid obtained by hydrogenating a dimer acid of an unsaturated fatty acid having 18 carbon atoms, and the structure represented by the formula (B2) 2. The pressure-sensitive adhesive composition according to claim 1, which is derived from a hydrogenated dimer diol obtained by reducing an additive dimer acid. 支持体の片面または両面に請求項1または2に記載の粘着剤組成物からなる層を有することを特徴とする粘着シ―トまたはテープA pressure-sensitive adhesive sheet or tape comprising a layer comprising the pressure-sensitive adhesive composition according to claim 1 or 2 on one side or both sides of a support. 粘着面にシリコ─ン処理を施していない剥離ライナが貼り合わされてなる請求項3に記載の粘着シ―トまたはテープ4. The adhesive sheet or tape according to claim 3, wherein a release liner that has not been subjected to a silicone treatment is bonded to the adhesive surface. シリコ─ン処理を施していない剥離ライナが、ポリエチレン、ポリプロピレン、ポリメチルペンテン、エチレン−プロピレン共重合体などからなるポリオレフイン系フイルムである請求項4に記載の粘着シ―トまたはテープThe pressure-sensitive adhesive sheet or tape according to claim 4, wherein the release liner not subjected to silicone treatment is a polyolefin-based film made of polyethylene, polypropylene, polymethylpentene, ethylene-propylene copolymer or the like.
JP04531798A 1998-02-26 1998-02-26 Adhesive composition and its adhesive sheet Expired - Fee Related JP4162286B2 (en)

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JP2001262093A (en) * 2000-03-16 2001-09-26 Hitachi Kasei Polymer Co Ltd Adhesive tapes for electronic device
CN1235936C (en) * 2000-03-23 2006-01-11 拜尔公司 Polyester carbonate and data carrier therefrom
JP2003003132A (en) * 2001-06-19 2003-01-08 Lintec Corp Adhesive sheet and pasting material
JP2003013014A (en) * 2001-06-27 2003-01-15 Lintec Corp Pressure-sensitive adhesive sheet and adhesive body
JP4914132B2 (en) * 2006-07-03 2012-04-11 日東電工株式会社 Polyester adhesive sheet with excellent transparency
JP5604037B2 (en) 2008-08-06 2014-10-08 日東電工株式会社 Polyester, polyester composition, pressure-sensitive adhesive composition, pressure-sensitive adhesive layer and pressure-sensitive adhesive sheet
DE102017208511A1 (en) * 2017-05-19 2018-11-22 Henkel Ag & Co. Kgaa Polyurethane-based binder system
CN113861923B (en) * 2021-10-27 2023-05-19 碧优新材料(广州)有限公司 Adhesive and preparation method thereof

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DE19513164A1 (en) * 1995-04-07 1996-10-10 Bayer Ag Hydroxy-terminated polycarbonates based on high mol. cyclic dimer diols with and use in prodn. of polyurethanes stable against hydrolysis and oxidn.

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