Process for stabilizing by encapsulation red phosphorus to be us

Details Process for stabilizing by encapsulation red phosphorus to be us Process for stabilizing by encapsulation red phosphorus to be us

1981-10-22

1984-04-03

Lieberman, Allan

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523200, 524 80, 524414, C08K 302, C08K 910, C08L 6128

Patent

active

044408803

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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