| abstract |
(57) [Summary] PROBLEM TO BE SOLVED: It is excellent in both the adhesive strength to an adherend and the effect of lowering the adhesive strength by heat treatment, and is unlikely to float or peel off even when adhered to a volatile matter-containing adherend for a long time. Development of printing sheets that maintain good adhesion. SOLUTION: An adhesive layer (3) containing heat-expandable microspheres and having a smooth outer surface (31) via an intermediate layer (2) on one surface of a printing substrate (1) having a single-layer or multilayer structure. ) A printing sheet comprising a porous polymer layer (1) having an apparent density of 0.85 g / cm 3 or less on at least a side of the printing substrate in contact with the intermediate layer. [Effect] Excellent printing characteristics, fine ink information can be given with high precision, adhesion strength can be easily controlled, and it can be firmly adhered to rough surface adherends. The adhesive layer is three-dimensionally deformed by heat treatment. As a result, the adhesive can be easily and reliably separated from the adherend, and volatile components such as moisture in the adherend volatilize through the porous polymer layer of the substrate. |