rylamidomethylsulfonates, (meth)acrylamidoethylsulfonates, 2-methylpropanesulfonic acid (meth)acrylamide, and styrenesulfonic acid; amides derived from unsaturated monocarboxylic acids and amines containing 1 to 30 carbon atoms, for example methyl(meth)acrylamide; vinyl aromatics such as styrene, ??-methylstyrene, vinyltoluene a