Preparation of insoluble polymer powders which are only...

Details Preparation of insoluble polymer powders which are only... Preparation of insoluble polymer powders which are only...

C - Chemistry, Metallurgy

08

F

402/404, 402/448

C08F 26/10 (2006.01)

Patent

CA 1258348

Abstract of the Disclosure: Insoluble polymer powders which are only slightly swellable are prepared by poly- merization of N-vinylpyrrolidone or a mixture of (a) an N- vinylcarboxamide, acrylamide, methacrylamide, acrylic acid, methacrylic acid, acrylates, methacrylates and/or a vinyl ester and (b) from 0.1 to 10% by weight, based on the total amount of monomers, of, as a crosslinking agent, a compound possessing two or more ethylenically unsatu- rated double bonds, in a powder bed in the presence of a heat-transfer medium and in the absence of oxygen and polymerization initiators, at from 90 to 220°C, the powder state being maintained, the reaction mass being circulated and the heat-transfer medium evaporated from the polymeri- zation zone. The resulting polymers are used as adsorbents, as formulation assistants for crop protection agents or as ion exchangers.

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