Semi-anhydrous, suspension process for preparing uniform, free-f

Details Semi-anhydrous, suspension process for preparing uniform, free-f Semi-anhydrous, suspension process for preparing uniform, free-f

1990-06-06

1991-11-19

Page, Thurman K.

Drug, bio-affecting and body treating compositions

Lymphokine

424486, A61K 31785

Patent

active

050664883

ABSTRACT:
What is provided herein is a semi-anhydrous, suspension process for preparing substantially anhydrous complexes of PVP and H.sub.2 O.sub.2 containing about 18% to about 22% by weight H.sub.2 O.sub.2. The process comprises suspending substantially anhydrous PVP and an aqueous solution of 70 to 85% H.sub.2 O.sub.2 in an anhydrous ethyl acetate medium to precipitate a free-flowing, fine white powders of the complex, and filtering and drying under vacuum at about 40.degree.-50.degree. C. to form the desired product.

REFERENCES:
patent: 3480557 (1969-11-01), Shiraeff
patent: 3755185 (1973-08-01), Waldmann et al.

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