BASE MATERIAL FILM FOR PATCH, PATCH USING THE FILM, STRAP, AND STRAP FOR RESCUE

摘要

PROBLEM TO BE SOLVED: To provide a base film for a patch capable of taking the place of a soft polyvinyl chloride film well-balanced in characteristics such as tensile strength flexibility and stress relaxation, and a patch using the film, a strap and a strap for rescue. SOLUTION: This base film for a patch is obtained by stacking a B layer formed of a copolymer material mainly composed of propylene such as random polypropylene, or the like, on one side or both sides of an A layer formed of amorphous (low crystalline) polyolefin such as amorphous polypropylene, a random copolymer of ethylene and/or butene-1 and propylene. The A layer is incorporated with a thermoplastic elastomer such as ethylene-butene copolymer and/or styrene-butadiene copolymer and an inorganic filler. The B layer is also incorporated with the thermoplastic elastomer. A pressure sensitive adhesive layer is stacked on the thus obtained base film for the patch, preferably on the B-layer exposed surface containing the thermoplastic elastomer to obtain the patch.