| abstract |
A surface protection sheet including a base layer and a pressure-sensitive adhesive layer which have been formed by coextrusion. The surface protection sheet has satisfactory suitability for unwinding from a roll, etc., and the pressure-sensitive adhesive layer has a smooth surface and satisfactory adhesion to rough surfaces, is free from release ingredient transfer thereto, and hence poses no problem concerning contamination. The surface protection sheet comprises: a base layer comprising a thermoplastic resin; a pressure-sensitive adhesive layer formed on one side of the base layer; and a back treatment layer formed on the other side and comprising a polyethylene resin. The surface protection sheet is characterized in that the base layer, pressure-sensitive adhesive layer, and back treatment layer have been integrally formed by coextrusion molding and the pressure-sensitive adhesive layer contains a noncrystalline polyolefin elastomer in an amount of 50 wt.% or larger. |