Synonyms: 2-Propenoic acid, 2-methyl-, methyl ester, polymer with 1,3-butadiene, butyl 2-propenoate and .alpha.-(2-methyl-1-oxo-2-propenyl)-.omega.-methoxypoly(oxy-1,2-ethanediyl);2-Methyl-2-propenoic acid methyl ester polymer with 1,3-butadiene, butyl 2-propenoate and a-(2-methyl-1-oxo-2-propenyl)-w-methoxypoly(oxy-1,2-ethanediyl)