yolefin and ethylene-vinyl acetate copolymer saponified product, of a thermoplastic polymer selected from the group consisting of polymers composed of a monomer expressed by the following formula ##STR10## wherein R3 is a hydrogen atom, or an alkyl group of up to 4 carbon atoms or a phenyl group,copolymers of said monomer with an olefin, and copolymers of said monomer with other ?? ,??-ethylenical