Preparation of finely divided polymer powders

Details Preparation of finely divided polymer powders Preparation of finely divided polymer powders

C - Chemistry, Metallurgy

08

F

402/397

C08F 2/32 (2006.01) C02F 1/54 (2006.01)

Patent

CA 2021759

O.Z. 0050/41002 Abstract of the Disclosures: A process is described for the preparation of finely divided polymer powders by polymerizing water-soluble monomers in the aqueous phase of a water-in-oil emulsion in the presence of water-in- oil emulsifiers and polymerization initiators, removing the water from the resultant water-in-oil polymer suspen- sion by azeotropic distillation, and isolating the suspended, finely divided polymer powder, either the polymerization of the water-soluble monomers being carried out in the presence of from 0.1 to 10% by weight, based on the monomers employed in the polymerization, of protective colloids, or the protective colloids being added to the water-in-oil polymer suspension after the polymerization is complete. The polymerization is prefer- ably carried out in the presence of surfactant. The finely divided pulverulent polymers are used as flocculants or thickeners for aqueous systems.

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