Surface protective films

摘要

The underside of a base layer consisting of one or more sub-layers is overlaid with an adhesive layer that is chiefly composed of an alpha -olefin copolymer that is based on at least two alpha -olefins selected from among alpha -olefins having 2-12 carbon atoms and which has a crystallinity of up to 10%, and said adhesive layer will develop an initial tack of at least 20 g/25 mm when attached to the surface of a stainless steel plate at 23 DEG C. The thus produced surface protective film, when attached to various kinds of adherends, will not experience separation of the adhesive layer from the base layer while developing strong initial tack, will experience only small changes in adhesive strength (peel strength) with the lapse of time after attachment to the adherends, is sufficiently low in blocking force to provide ease in film handling during the rewinding operation and it yet can be manufactured at low cost.