To provide a pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer having both a sufficient yield of polymerization and concealability even in the case when the property of the pressure-sensitive adhesive composition is rendered photopolymerizable.
The pressure-sensitive adhesive composition comprises (1) a pressure-sensitive adhesive material, especially a photopolymerizable pressure-sensitive adhesive material comprising (a) a vinyl-based monomer composed mainly of a (meth)acrylate having a 1-14C hydrocarbon or a partially polymerized product thereof and (b) a photopolymerization initiator and (2) a thermally color-changing agent which irreversibly changes its color by heating.
COPYRIGHT: (C)2004,JPO
Tetsuo Kishimoto
Hirose
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Koichi Kajisaki
Yuzo Ozaki
Toshihiko Taniguchi