Other suitable hydrophilic monomers that may be used include acrylates such as acrylic acid (???AA???), 2-hydroxyethyl acrylate, hydroxypropyl methacrylate, glycerol monoacrylate, methacryloxyethyl glycoside (all anomers); acrylamides such as diacetone acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, N-vinyl acrylamide, -methacryloyltris(hydroxymethyl)methylamine; vinyl ester and amide monom