rylate, hydroxypropyl methacrylate, ethyl maleate, butyl fumarate, maleic dimethyl ester, maleic acid mono-(2-ethylhexyl)ester, fumaric acid diethyl ester, and fumaric acid dilauryl ester; ??,??-olefinically unsaturated nitriles containing 3 to 5 carbon atoms, such as acrylonitrile and methacrylonitrile; acrylamides derived from acrylic and methacrylic acids and their N-alkylol and N-alkoxyalkyl d