Semi-anhydrous, suspension process for preparing uniform, free-flowing, fine, white powders of substantially anhydrous complexes of PVP and H.sub.2 O.sub.2 containing about 18 to about 22% H.sub.2 O.sub.2
First Claim
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1. A suspension process for preparing uniform, free-flowing, fine, white powders of a complex of PVP and H2 O2 having an H2 O2 content between about 18 and about 22% H2 O2 and about 2% water or less which comprises:
- (a) forming a suspension of water-insoluble PVP containing less than about 1% water in anhydrous ethyl acetate;
(b) slowly adding an aqueous H2 O2 solution containing about 70 to about 85% by weight H2 O2, the amounts of PVP and H2 O2 corresponding substantially to the desired molar ratio of PVP and H2 O2 in the complex, at a temperature of about 0°
-10°
C., under agitation, to precipitate a PVP-H2 O2 complex in the form of a uniform, free-flowing, fine, white powder,(c) filtering, and(d) drying the web precipitate with substantially no loss of H2 O2 to form the desired powders having the improved properties defined above.
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Abstract
What is provided herein is a semi-anhydrous, suspension process for preparing substantially anhydrous complexes of PVP and H2 O2 containing about 18% to about 22% by weight H2 O2. The process comprises suspending substantially anhydrous PVP and an aqueous solution of 70 to 85% H2 O2 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°-50° C. to form the desired product.
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Citations
6 Claims
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1. A suspension process for preparing uniform, free-flowing, fine, white powders of a complex of PVP and H2 O2 having an H2 O2 content between about 18 and about 22% H2 O2 and about 2% water or less which comprises:
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(a) forming a suspension of water-insoluble PVP containing less than about 1% water in anhydrous ethyl acetate; (b) slowly adding an aqueous H2 O2 solution containing about 70 to about 85% by weight H2 O2, the amounts of PVP and H2 O2 corresponding substantially to the desired molar ratio of PVP and H2 O2 in the complex, at a temperature of about 0°
-10°
C., under agitation, to precipitate a PVP-H2 O2 complex in the form of a uniform, free-flowing, fine, white powder,(c) filtering, and (d) drying the web precipitate with substantially no loss of H2 O2 to form the desired powders having the improved properties defined above. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification
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Current AssigneeISP Investments, Inc. (Ashland Global Holdings, Inc.)
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Original AssigneeISP Investments, Inc. (Ashland Global Holdings, Inc.)
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InventorsMerianos, John J., Garelick, Paul, Login, Robert B.
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Primary Examiner(s)Page, Thurman K.
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Assistant Examiner(s)KULKOSKY, PETER F
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Application NumberUS07/533,749Time in Patent Office531 DaysField of Search424/80, 424/486, 424/613US Class Current525/387CPC Class CodesA01N 2300/00 Combinations or mixtures of...A01N 59/00 Biocides, pest repellants o...A61K 2800/222 EffervescentA61K 2800/31 AnhydrousA61K 47/58 obtained by reactions only ...A61K 8/22 Peroxides; Oxygen; OzoneA61K 8/8176 Homopolymers of N-vinyl-pyr...A61L 12/124 Hydrogen peroxide; Peroxy c...A61L 15/18 containing inorganic materialsA61L 15/24 Macromolecular compounds ob...A61L 15/46 Deodorants or malodour coun...A61L 2300/11 Peroxy compounds, peroxides...A61L 2300/404 Biocides, antimicrobial age...A61Q 17/005 Antimicrobial preparationsC01B 15/01 Hydrogen peroxideC02F 1/722 Oxidation by peroxidesC08F 26/10 N-Vinyl-pyrrolidoneC08F 8/00 Chemical modification by af...C08K 3/20 Oxides; Hydroxides graphene...C08K 3/26 Carbonates; BicarbonatesView All
