PURPOSE: To improve resistance to repulsion and maintenance of heat resistance by providing a pressure-sensitive adhesive layer, which comprises a crosslinked structure divided into a plurality of blocks in the direction of the base surface, on the surface of a (non)peelable film base.

CONSTITUTION: A pressure-sensitive adhesive comprising a solvent-based or (non)aqueous emulsion containing a crosslinking agent is applied to the surface of a (non)peelable film base 5-100μm thick in such a manner that it may have striped, network, dotted or other patterns 2-200μm thick and each block has a mirror axis diameter below 10 times the thickness. Then, the adhesive is crosslinked at room temp. or with heating so as to divide the adhesive layer in a plurality of blocks.