| 摘要 |
A process for the preparation of pulverulent polymers based on water-soluble, ethylenically unsaturated monomers by polymerising monomers containing acid groups which are dissolved in a monohydric C1- to C8-alcohol, dimethylformamide, dimethyl sulphoxide or 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 material, where from 40 to 95% of the acid groups of the monomers have been neutralised and the polymerisation is carried out in the presence of from 3 to 10 mol %, based on the monomers, of a thiocarboxylic acid, a metal salt or chelate or an enol ether as regulator. The resultant homopolymers and copolymers are used as grinding aids and dispersants for pigments and as an encrustation inhibitor and antiredeposition agent (antigreying agent) for detergents.
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