Preparation of insoluble polymer powders which are only slightly

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

1985-09-18

1987-04-14

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 88, 5263071, 52631843, 5263232, C08F 234

Patent

active

046580026

ABSTRACT:
Insoluble polymer powders which are only slightly swellable are prepared by polymerization 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 unsaturated 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.degree. to 220.degree. C., the powder state being maintained, the reaction mass being circulated and the heat-transfer medium evaporated from the polymerization zone.
The resulting polymers are used as adsorbents, as formulation assistants for crop protection agents or as ion exchangers.

REFERENCES:
patent: 3277066 (1966-10-01), Grosser et al.
patent: 3689439 (1972-09-01), Field
patent: 3933766 (1976-01-01), Hofmann et al.
patent: 4013825 (1977-03-01), Denzinger et al.
patent: 4059552 (1977-11-01), Zweigle
patent: 4135043 (1979-01-01), Kast et al.
patent: 4361689 (1982-11-01), Patel
patent: 4451582 (1984-05-01), Denzinger et al.

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