Strongly swellable, moderately crosslinked polyvinylpyrrolidone

Details Strongly swellable, moderately crosslinked polyvinylpyrrolidone Strongly swellable, moderately crosslinked polyvinylpyrrolidone

1990-10-18

1991-12-17

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526264, C08F 2606

Patent

active

050736140

ABSTRACT:
What is provided herein are strongly swellable, moderately crosslinked polyvinylpyrrolidone polymers in the form of fine, white powders characterized by (a) an aqueous swelling parameter defined by its gel volume of about 15 to 150 ml/g, (b) a Brookfield viscosity in 5% aqueous solution of at least about 10,000 cps, and (c) being prepared directly by a precipitation polymerization process in an organic solvent, in the presence of about 0.2 to 1% by weight of vinylpyrrolidone of a multifunctional crosslinking agent, preferably about 0.25 to 0.6%, and optimally, about 0.35 to 0.6%.

REFERENCES:
patent: 4873299 (1989-10-01), Nowakowsky et al.

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