Preparation of pulverulent polymers and their use

Details Preparation of pulverulent polymers and their use Preparation of pulverulent polymers and their use

C - Chemistry, Metallurgy

08

F

402/305, 402/321

C08F 2/38 (2006.01) C08F 20/06 (2006.01) C11D 3/37 (2006.01) D21H 19/58 (2006.01)

Patent

CA 1241497

ABSTRACT OF THE DISCLOSURE Pulverulent polymers based on water-soluble ethylenically unsaturated monomers are prepared by polymerizing monomers, which contain acidic groups and are dissolved in water or a water/isopropanol mixture, in a powder bed in the presence of a conven- tional polymerization initiator while maintaining the powder state, conducting away the heat of polymerization by distilling off the solvent and circulating the reac- tion mixture, by a process in which from 40 to 95% of the acidic groups of the monomers are neutralized and the polymerization is carried out in the presence of from 3 to 10 mole%, based on the monomers, of a thiocarboxylic acid, of a metal salt or chelate, of an enol-ether or of Z-mercaptoethanol as a regulator. The homopolymers and copolymers thus obtained are used as milling assistants and dispersants for pigments and as encrustation inhibitors and antiredeposition agents for detergents.

442498

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