Butyl acrylate, acrylonitrile, methacrylic acid, 2-acrylamido-2-methylpropanesulfonic acid polymer

2-Propenoic acid, 2-methyl-, polymer with butyl 2-propenoate, 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid and 2-propenenitrile