| http://www.w3.org/ns/prov#value | - e D groups of the polymer are hydroxyl and the balance of the D groups of the polymer are ##STR12## wherein M is an alkali metal and A is ammonia or a nitrogen-containing basic organic compound,in an aqueous solution or an organic solvent solution of a cross-linking agent selected from the group consisting of melamine and urea resins, benzoguanamine resins, amino resins mixed with benzoguanamine r
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