Continuous preparation of finely divided gel-like...

Details Continuous preparation of finely divided gel-like... Continuous preparation of finely divided gel-like...

C - Chemistry, Metallurgy

08

F

402/410, 400/904

C08F 220/04 (2006.01) B01J 19/18 (2006.01) C08F 2/10 (2006.01)

Patent

CA 1305808

O.Z. 0050/38059 Abstract of the Disclosure: Finely divided, gel-like crosslinked polymers are prepared by a continuous method in which a monomer mixture which contains, per 100 parts by weight of acrylic acid or methacrylic acid, from 50 to 100 mol% of which in each case are neutralized, acrylamide, methacrylamide or N-vinylpyrrolidone, from 0 to 30 parts by weight of other water-soluble mono- ethylenically unsaturated monomers and from 0 to 20 parts by weight of water-insoluble monoethylenically unsatu- rated monomers is copolymerized with from 0.01 to 5 parts by weight of a crosslinking agent, in 20 - 65% strength by weight aqueous solution in the presence of an initi- ator at from 45 to 95°C in a single-screw cylindrical mixer whose stirrer shaft possesses disk segments which have, at the outer end, mixing bars which are arranged in a manner such that the substances fed in at the en- trance of the mixer are conveyed in the axial direction to the exit of the mixer, the aqueous monomer solution in the mixer is polymerized under from 100 to 800 mbar, and some of the water is removed during the polymeriza- tion, so that a crumb-like gel having a solids content of from 30 to 70% by weight is discharged.

520498

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