B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
400/102, 117/48,
B01J 13/02 (2006.01) C01B 25/00 (2006.01) C08K 3/02 (2006.01) C08K 9/10 (2006.01) C08L 101/00 (2006.01)
Patent
CA 1162794
ABSTRACT OF THE DISCLOSURE: The invention relates to a process for stabilizing red phosphorus powder, in its various allotropic forms, by encapsulating -the particles of said powder in a melamine resin for its safe use as a flame retardant of polymeric materials, which comprises the steps of: (a) preparing an aqueous solution of a melamine condensate cationized with a mineral acid by reacting in an aqueous medium melamine, formaldehyde, triethanolamine, and an aliphatic monohydroxyl alcohol having up to 5 carbon atoms, in the respective percent by weight ratios: 25.27% to 21.62%, 36.04% to' 30.85% 29.87% to 25.57% and 8.82% to 21.96%, and adjusting the pH thereof with the mineral acid, (b) forming a hydrodispersion of the solution formed in step (a) by dispersing red phosphorus powder directly therein; (c) heating said hydrodispersion, under stirring at 80° to 100°C to encapsulate individual particles of the red phosphorus powder by precipitating onto said indivi- dual particles of red phosphorus powder, said melamine condensate to form a continuous and compact layer of an insoluble, partially cross-linked melamine resin; and (d) subsequently drying the insoluble, partially cross- linked layer of melamine resin in an inert gas stream at 80° to 130°C to obtain a cross-linked melamine resin- encapsulated red phosphorus powder suitable for easy and safe dispersion in polymeric materials, said layer of melamine resin which encapsulates said red phosphorus powder amounting to 0.1 to 30% by weight of the red phosphorus powder.
387399
Albanesi Giancarlo
Rinaldi Gianfranco
Robic Robic & Associes/associates
Saffa S.p.a.
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