. . "vinyl group copolymerizable with said A and B monomers; Y is a divalent linking group where n is zero or 1; m is an integer of from 1 to 3; R is hydrogen, lower alkyl, aryl, or alkoxy; Z is a monovalent siloxane polymeric moiety having a number average molecular weight above about 1,000 and is essentially unreactive under copolymerization conditions;wherein said monomers are copolymerized to form" . .