| http://www.w3.org/ns/prov#value | - Suitable auxiliary monomers to improve the water solubility are, for example, ??,??-monoethylenically unsaturated monocarboxylic and dicarboxylic acids and their amides or nitriles, e.g. acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, acrylamide or methacrylamide; ethylenically unsaturated sulfonic acids or their salts, preferably vinylsulfonic acid, 2-acrylamidopropanesu
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