| abstract |
Process for modifying polymers containing acid groups by reacting DOLLAR A (a) polymers which contain at least 5% by weight of a monomer containing monoethylenically unsaturated acid groups in copolymerized form, have molar masses of 200 to 100,000 and which, if appropriate, by free-radical polymerization of monoethylenically unsaturated acids in the presence of other monoethylenically unsaturated monomers in aqueous solution in the presence of at least 4% by weight, based on the monomers used in the polymerization, of a water-soluble sulfur compound in which the sulfur has the oxidation number +4, DOLLAR A with DOLLAR A (b) polyalkylene glycols, alkylpolyalkylene glycol amines or mixtures thereof which are end-capped at one end, and also mixtures of at least one of the two compounds mentioned with up to 30% by weight, based on the mixtures, of ammonia, amines, alcohols, hydroxycarboxylic acids or amino carbons A DOLLAR acids at temperatures up to 250 DEG C. |