| http://www.w3.org/ns/prov#value | - A composition according to claim 17 in which the zwitterionic polymer is formed from monomers including a compound selected from the group consisting of acrylic acid, methacrylic acid, 2-sulphoethyl methacrylate, 2-methacryloyloxyethyl phosphate, p-styrene sulphonic acid, 2-(methacryloyloxyethyl)trimethyl ammonium chloride, 3-aminopropyl methacrylamide and vinyl benzyl trimethyl ammonium chloride.
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