Manufacture of insoluble and only slightly water-swellable...

Details Manufacture of insoluble and only slightly water-swellable... Manufacture of insoluble and only slightly water-swellable...

C - Chemistry, Metallurgy

08

F

402/33, 402/477,

C08F 126/06 (2006.01) A23L 2/80 (2006.01) B01J 20/22 (2006.01) C08F 26/06 (2006.01) C12H 1/056 (2006.01)

Patent

CA 1076288

ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the manufacture of insoluble and only slightly swellable polymers or copolymers of N-vinyl pyrrolidone, N-vinyl caprolactam and N-vinyl pipe idone, in which N-vinyl pyrrolidone or a mixture of N-vinyl pyrrolidone with from 5 to 100% by weight, based on N-vinyl pyrro- lidone, of N-vinyl caprolactam or N-vinyl piperidone, is polymerized in dilute aqueous solution at pHs greater than 6 with the exclusion of oxygen and in the presence of a cyclic amide containing at least two ethylenically unsaturated groups, of which at least one is attached to an amide nitrogen atom, and in the presence of from 0.05 to 2% by weight, based on N-vinyl pyrrolidone, of at least one substance selected from the group consisting of ascorbic acid, ethyl acetoacetate and pyruvic acid, said polymerization being carried out at from 50° tv 100°C.

231427

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