| 摘要 |
A heat-peelable pressure-sensitive adhesive sheet which, even when applied to a flexible adherend or extremely small adherend, enables the adherend to be efficiently separated and recovered therefrom without breaking. The heat-peelable pressure-sensitive adhesive sheet comprises a substrate and, superposed on one side thereof in the following order, an interlayer having a thickness (A) and a heat-peelable pressure-sensitive adhesive layer which has a thickness (B) and contains heat-expandable microspheres having a maximum particle diameter (C). The heat-peelable pressure-sensitive adhesive sheet is characterized in that it satisfies the relationships C<=(A+B)<=60 mum and 0.25C<=B<=0.8C and the heat-peelable pressure-sensitive adhesive layer through a heat treatment comes to have an adhesive force less than 0.1 N/20 mm. The heat-peelable pressure-sensitive adhesive layer after the heat treatment preferably has a center-line average surface roughness (Ra) of 5 mum or smaller and a maximum difference in height (Rmax) of 25 mum or smaller. The substrate preferably has a glass transition temperature (Tg) of 60°C or higher and a thickness of 50 mum or smaller. |
