Continuous preparation of finely divided gel-like crosslinked po

Details Continuous preparation of finely divided gel-like crosslinked po Continuous preparation of finely divided gel-like crosslinked po

1986-10-22

1988-09-06

Schofer, Joseph L.

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

Synthetic resins

Polymerizing in tubular or loop reactor

526 88, 526240, 526263, 526306, 5263077, 526321, 5263232, 526920, 422137, C08F 224, C08F 2006, C08F 2056

Patent

active

047694270

ABSTRACT:
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 monoethylenically unsaturated monomers and from 0 to 20 parts by weight of water-insoluble monoethylenically unsaturated 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 initiator at from 45.degree. to 95.degree. 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 entrance 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 polymerization, so that a crumb-like gel having a solids content of from 30 to 70% by weight is discharged.

REFERENCES:
patent: 3536680 (1964-10-01), Illing
patent: 4487897 (1984-12-01), Matsuoka et al.

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