Urea-hydrogen peroxide-polyvinylpyrrolidone process
US5206385A · kind A · utility
50Cited by
2References
1Claims
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Key dates
| Filing date | Jul 2, 1992 |
| Grant date | Apr 27, 1993 |
| Priority date | — |
| Expiry date | Jul 2, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D3/394
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Urea-hydrogen peroxide-polyvinylpyrrolidone (PVP) in the form of a free-flowing powder is stable against decomposition in water and alcohol solvents. The product is obtained by spraying an aqueous solution of urea-hydrogen peroxide onto a fluidized bed of PVP and drying; it contains about 5%-20% by weight H.sub.2 O.sub.2 and less than about 5% water. The urea-hydrogen peroxide solution is applied onto the fluidized PVP bed at a predetermined rate, suitably about 0.5-30 g of solution/minute/kg PVP in the bed, and, preferably, about 1-3 g/min/kg PVP.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.