Pulverförmiges Absorptionsmittel für wässrige Flüssigkeiten auf Basis eines wasserquellbaren Polymeren

摘要

The invention relates to a powdery absorbent for aqueous liquids, based on a water-swellable powdery polymer having at least 0.2 equivalents of carboxyl groups per 100 parts by weight, of which 50 to 99, advantageously at least 80, mol% are neutralised. The absorbent can be obtained by treating the water-swellable, carboxyl group- containing polymer with a solution of N-hydroxyalkyl- beta -(meth)alanine ester or the polycondensation products thereof. The solvent used for the treatment agent is water, which contains either water-miscible organic diluents, which evaporate on warming of the mixture, or diluents which do not evaporate i.e. remain in the polymer.