Further, one may blend in resin substances such as graft polymers obtained by graft polymerization of one or more of generally used rubbery substances such as chlorinated polyethylene, styrene-butadiene copolymer rubber, acrylonitrile-butadiene copolymer rubber, copolymer or terpolymer rubbers comprising principally ethylene and propylene, chloroprene rubber, chlorosulfonated polyethylene rubber s