2-Propenoic acid, 2-methyl-, butyl ester, polymer with 1,1-dimethylethyl 2-methyl-2-propenoate, ethenylbenzene and 2-hydroxyethyl 2-methyl-2-propenoate, tert-Bu 3,5,5-trimethylhexaneperoxoate-initiated 250672-06-1