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US 5,205,961 AGranted
Granular calcium hypochlorite treatment process
AssigneePPG Industries, Inc.
InventorsDonald E. Shenefiel, Richard H. Ferguson
Life of this patent
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AssigneePPG Industries, Inc.
InventorsDonald E. Shenefiel, Richard H. Ferguson
Estimating the term…
A method for preparing granular calcium hypochlorite treated with polyfluorinated polymer is disclosed. The treated product may be compressed and formed into shaped articles. A method described comprises spraying a suspension of polyfluorinated polymer, e.g., polytetrafluoroethylene, onto granular calcium hypochlorite in a continuous or batch blender. Tablets prepared from the granular hypochlorite so surface treated with polyfluorinated polymer dissolve in water at a rate slower than tablets prepared from granular calcium hypochlorite having polyfluorinated polymer dispersed throughout the granules. Granular calcium hypochlorite having a particle size range of -6, +100 U.S. Sieve Series having from about 0.005 to 0.5 weight percent polyfluorinated polymer on its surface are described.
A method for preparing calcium hypochlorite articles for use in slow dissolving applications, comprising treating the surface of granular calcium hypochlorite having a principal particle size range of between -6 and +100 U.S. Sieve Series with from about 0.005 to about 0.5 weight percent of an agent consisting essentially of polyfluorinated polymer, and forming said treated granular hypochlorite into a shaped article having a mass of between about 1 gram and about 350 grams.
Granular calcium hypochlorite having a principal particle size range between -6 and +100 U.S. Sieve Series having from about 0.005 to about 0.5 weight percent of an agent consisting essentially of polyfluorinated polymer applied to the surface of the granules, the interior of said granules being substantially free of said polyfluorinated polymer.
Dependencies are inferred from the claim text.