Urea-hydrogen peroxide-polyvinylpyrrolidone
AssigneeISP Investments Inc.
InventorsRobert B. Login, John J. Merianos, Russell B. Biss, Paul Garelick
Life of this patent
Estimating the term…
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.
Claims13
A process for the production of free-flowing powders of a urea-H.sub.2 O.sub.2 -PVP product comprising reacting a fluidized bed of PVP maintained at a reaction temperature of from ambient temperature to about 60.degree. C. with finely divided droplets of a 15 to 30% by weight aqueous solution of urea-H.sub.2 O.sub.2, and drying the product.
Dependencies are inferred from the claim text.