Preparation of finely divided, water-soluble polymers

Details Preparation of finely divided, water-soluble polymers Preparation of finely divided, water-soluble polymers

1991-03-01

1993-11-02

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 81, 526 88, 526207, 5263171, C08F 208, C08F 2006

Patent

active

052584739

ABSTRACT:
Finely divided, water-soluble polymers are prepared by polymerization of water-soluble, monoethylenically unsaturated monomers in not less than 20% strength by weight aqueous solution in the presence of a polymerization initiator in a kneader by a process in which from 0.1 to 10% by weight, based on the total monomers, of a surfactant are used in the polymerization, the polymerization initially being carried out to a conversion of the monomers of not less than 60% in the absence of the surfactant or in the presence of not more than 50% of the amount of surfactant, and the remaining amount of surfactant then being added to the reaction mixture and the polymerization completed. The addition of surfactant causes the polymer gel to disintegrate with formation of fine particles.

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patent: 4880886 (1989-11-01), Kondo et al.
patent: 5149750 (1992-09-01), Niessner et al.

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