A pressure-sensitive adhesive composition showing the adhesive force and the cohesive force with a good stability is disclosed. The composition comprises a copolymer of a (meth)acrylic acid alkyl ester (a) having an alkyl group having from 2 to 14 carbon atoms and a (meth)acrylic acid alkyl ester (b) having a carboxyl group or a hydroxyl group at the terminal and having an alkyl group having from 3 to 14 total carbon atoms as the ester side chain. In particular, when the carbon atom number of the alkyl group of the monomer (b) is less by one than or not less than the same number as the carbon atom number of the alkyl group of the monomer (a), the effect of the functional group can be most effectively exhibited. A pressure-sensitive adhesive tape or sheet is also disclosed, comprising a support having formed at least one surface thereof the pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition.
本发明公开了一种压敏胶组合物,该组合物具有良好的粘合力和内聚力,并具有良好的稳定性。该组合物包括具有 2 至 14 个碳原子的烷基的(甲基)
丙烯酸烷基酯(a)和末端具有羧基或羟基并具有 3 至 14 个碳原子的烷基作为酯侧链的(甲基)
丙烯酸烷基酯(b)的共聚物。特别是当单体(b)的烷基的碳原子数比单体(a)的烷基的碳原子数少一个或不少于相同数目时,官能团的效果可以最有效地表现出来。本发明还公开了一种压敏胶带或胶片,包括一个支撑物,其至少一个表面形成了包含压敏胶组合物的压敏胶层。