Process for stabilizing by encapsulation red phosphorus to be used as flame retardant of polymeric materials and product so obtained
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United States of America Patent
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Apr 3, 1984
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N/A
app pub date -
Oct 22, 1981
filing date -
Nov 19, 1980
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Expired
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Abstract
A process for stabilizing by encapsulation red phosphorus powder for using it as flame retardant for polymeric materials, consisting in preparing a red phosphorus dispersion in an aqueous solution of a melamine condensate cationized with a mineral acid, consisting of melamine, formaldehyde, triethanolamine and a monohydroxyl alcohol having up to 5 carbon atoms, in heating the aforesaid dispersion, under stirring, at 80.degree.-100.degree. C. in order to precipitate said condensate in the form of a melamine resin partially cross-linked around the individual red phosphorus particles which are so stabilized by a continuous and compact layer of said resin, then in completing the cross-linking of same in a final dehydration step by drying at 80.degree.-130.degree. C.
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