2-Propenoic acid, 2-methyl-, 3-(dimethoxymethylsilyl)propyl ester, polymer with butyl 2-propenoate, methyl 2-methyl-2-propenoate and octadecyl 2-methyl-2-propenoate, 2,2'-(1,2-diazenediyl)bis[2-methylbutanenitrile]-initiated