The present invention relates to a pressure-sensitive adhesive tape or sheet comprising: a viscoelastic layer containing bubbles and/or fine particles; and a pressure-sensitive adhesive layer formed on at least one side of the viscoelastic layer and formed from a pressure-sensitive adhesive composition comprising a monomer mixture comprising the following (a1), (a2) and (a3) or partially polymerized product thereof, and thermal-expandable fine particles:
(a1) alkyl (meth)acrylate monomer having 4 to 12 carbon atoms in its alkyl moiety and having a glass transition temperature when formed into a homopolymer of lower than 0°C;
(a2) monomer having at least one nitrogen atom and one ethylenically unsaturated bond in its molecule; and
(a3) monomer having one ethylenically unsaturated bond in its molecule and having a glass transition temperature when formed into a homopolymer of 0°C or higher (excluding (a2) above).
                            本发明涉及一种压敏胶带或胶片,其包括:含有气泡和/或细小颗粒的粘弹性层;以及至少在粘弹性层一侧形成的压敏胶层,该层由压敏胶组合物形成,该组合物包括由下列单体混合物组成的(a1)、(a2)和(a3)或其部分聚合产物,以及可热膨胀的细小颗粒:
(a1) (甲基)
丙烯酸烷基单体,其烷基中含有 4 至 12 个碳原子,形成均聚物时的玻 璃转变温度低于 0°C;
(a2) 分子中至少有一个氮原子和一个
乙烯不饱和键的单体;以及
(a3) 分子中含有一个
乙烯不饱和键,且形成均聚物时
玻璃化转变温度为 0℃或以上的单体(不包括上述(a2))。