"The method of claim 4 in which said monomer is selected from the group of methyl methacrylate, methacrylic acid, acrylic acid, methacrylamide, acrylamide, ethyl methacrylate, butyl methacrylate, methyl acrylate, butyl acrylate, and other copolymers thereof with each other or other monomers." . . . . . . .