Surface-modified pressure-sensitive adhesive, method of modifying surface of pressure-sensitive adhesive and pressure-sensitive adhesive tape

摘要

The surface-modified pressure-sensitive adhesive has a surface-modifying layer made of another polymer and physically fixed to a surface of the pressure-sensitive adhesive; and the method of modifying a surface of a pressure-sensitive adhesive includes the following steps (A) to (C): step (A): forming a surface-modifying layer made of another polymer on the surface of the pressure-sensitive adhesive without physically fixing the layer to the surface, step (B): causing molecules of the polymer constituting the surface-modifying layer to diffuse from the pressure-sensitive adhesive surface into inner parts of the adhesive, and step (C): crosslinking the pressure-sensitive adhesive while keeping the molecular chains of the polymer constituting the surface-modifying layer in the state of being partly embedded in the pressure-sensitive adhesive to thereby physically fix the surface-modifying layer to the surface of the pressure-sensitive adhesive.