| abstract |
(57) [Summary] [Purpose] The development of an adhesive sheet that is excellent in both the adhesive strength to the adherend and the effect of reducing the adhesive strength by the heat foaming treatment. [Structure] A pressure-sensitive adhesive layer (2) having, on one or both sides of a substrate (1), a portion having a strong adhesive force with the substrate and a portion having a weak adhesive force distributed therein, and the pressure-sensitive adhesive layer. An adhesive sheet containing a foaming agent that expands and / or expands when heated. [Effect] While having the adhesive property of firmly adhering even to a rough surface type adherend, the pressure sensitive adhesive layer is three-dimensionally deformed by the heat treatment, and the adhesive area is efficiently reduced. The adhesive strength is excellently reduced and it can be easily peeled off from the adherend, so that the separation can be performed easily and surely. |