Process for the preparation of pulverulent polymers and the use thereof

摘要

A process for the preparation of pulverulent polymers based on water-soluble, ethylenically unsaturated monomers by polymerising acid group-containing monomers dissolved in water in a powder bed in the presence of conventional polymerisation initiators while maintaining the powder state, dissipating the heat of polymerisation by removing the solvent by distillation and circulating the reaction mass, where from 40 to 95% of the acid groups of the monomers are neutralised and the polymerisation is carried out in the presence of from 3 to 10 mol %, based on the monomers, of 2-mercaptoethanol as regulator. The homopolymers and copolymers obtained in this way are used as grinding auxiliaries and dispersants for pigments and as encrustation inhibitors and antigreying agents (antiredeposition agents) for detergents.