Pressure-sensitive acrylic adhesive composition, and adhesive tape, or the like, coated therewith

アクリル系感圧性接着剤組成物とその接着シ―ト類

Abstract

(57)【要約】 【課題】 常温で粘着性を示す接合材料として、接着性 にすぐれ、かつ実装時のハンダリフロ―に耐えうる耐熱 性を有し、さらに電子部品を腐食させることのないアク リル系感圧性接着剤組成物を提供する。 【解決手段】 (メタ)アクリル酸と、フエノ―ルまた はアルキル置換(モノもしくはジ置換)フエノ―ルのメ チレンオキシド、エチレンオキシド、プロピレンオキシ ド付加物(付加モル数1〜3)とのエステル化物50〜 80重量%と、これと共重合可能でかつ分子内にカルボ キシル基を含有しないモノエチレン性不飽和単量体50 〜20重量%とからなる単量体混合物の粘着性共重合物 を含有することを特徴とするアクリル系感圧性接着剤組 成物。
PROBLEM TO BE SOLVED: To obtain an adhesive composition which shows pressure-sensitive adhesiveness at ordinary temperature and excellent adhesiveness, has heat resistance enough to withstand solder reflow during mounting electronic components, and is noncorrosive to electronic components by using as the principal component a pressure-sensitive adhesive copolymer obtained from a (meth)acrylic ester and a monoethylenically unsaturated monomer containing no carboxyl in the molecule. SOLUTION: This composition comprises a pressure-sensitive adhesive copolymer prepared from a mixture comprising 50-80 wt.% (meth)acrylic ester represented by the formula and 50-20 wt.% monoethylenically unsaturated monomer having no carboxyl in the molecule and being copolymerizable therewith. In the formula, R1 is hydrogen or methyl; R2 is methylene, ethylene, or propylene; (n) is an integer of 1-3; and ϕ is phenyl, a monoalkyl-substituted phenyl, or a dialkyl-substituted phenyl. It is desirable that the pressure-sensitive adhesive copolymer is a copolymer prepared by irradiation with a radiation such as an ultraviolet radiation.

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