Strongly swellable, moderately crosslinked copolymers of vinylpy

Details Strongly swellable, moderately crosslinked copolymers of vinylpy Strongly swellable, moderately crosslinked copolymers of vinylpy

1996-02-20

1997-09-02

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526319, C08F22610, C08F21808

Patent

active

056632584

ABSTRACT:
Strongly swellable, moderately crosslinked poly(vinyl pyrrolidone/vinyl acetate) copolymer (XL-PVP/VA) in the form of fine, white powders characterized by (a) an aqueous gel volume of about 15 to 150 ml/g of polymer, (b) a Brookfield viscosity in 5% aqueous solution of at least about 10,000 cps, and (c) being prepared directly by precipitation polymerization of VP and VA monomers in the presence of a crosslinking agent in the amount of about 0.1 to about 2% by weight of VP and VA.

REFERENCES:
patent: 5073614 (1991-12-01), Shih et al.
patent: 5426163 (1995-06-01), Buehler et al.

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