2-Propenoic acid, 2-methyl-, methyl ester, polymer with 2-propenoic acid, sodium 2-methyl-2-[(1-oxo-2-propen-1-yl)amino]-1-propanesulfonate (1:1), sodium 2-methyl-2-propene-1-sulfonate (1:1) and sodium 4-[(2-methyl-2-propen-1-yl)oxy]benzenesulfonate (1:1), sodium salt, peroxydisulfuric acid ([(HO)S(O)2]2O2) sodium salt (1:2)-initiated