"The monoester of an unsaturated dicarboxylic acid which is copolymerized with the acrylate monomer(s) to provide the dispersed phase of the stable emulsion of the invention is one having the general formula: ##STR2## where R5 is a straight or branched chain aliphatic or cyclo aliphatic group of at least 3 carbon atoms, n and m are each 0 or 1 and n + m is 0 or 1." . . . .