ch as ??-methyl styrene, vinyl toluenes, and o-, m-, and p-chlorostyrenes, as homopolymers, mutual copolymers thereof, and copolymers thereof with other monomers copolymerized therewith such as acrylonitrile and methacrylate esters; and homopolymers and copolymers of vinyl halides such as vinyl chloride, acrylate esters such as loweralkyl (C1 - C6) acrylates and methacrylate esters such as lower a