| abstract |
1526363 Flameproofed plastics compositions RHONE-POULENC INDUSTRIES 8 June 1976 [10 June 1975] 23679/76 Headings C3L C3B and C3R [Also in Division C1] A plastics composition contains by weight 0À1-20% of red P particles of mean diameter #200 Ám. encapsulated in a polymer (A) which does not melt or soften at <90‹ C. and which has mean MW # 2000. Based on P, there may be 5-80% wt. of (A). Also present, based on wt. of P, may be #100% of oxide(s) of Cu, Zn, Ag, Fe, Sb, Mg, V, Sn, or Ti. Glass fibres, kaolin, tale., self-lubricating fillers, poly(alkyleneglycol) laurate, and conventional additives may be present. Long lists of suitable polymers (A) and of the base plastics materials (B) of the composition are given. In the Examples, (A) is a polyamideimide, polycarbonate, pyrocatechol-formaldehyde, copolyamide, or phenolformaldehyde novolac containing HMT; (B) is nylon 66, poly(tetramethylene terephthalate), polypropylene, or polystyrene; the encapsulation is performed by mixing the red P with a solution of (A), adding water, filtering, washing and drying; and the encapsulated red P and plastics (B) may be mixed in an extruder or a rotating drum. Specifications 1,526,362, 1,526,361 and 1,526,364 are referred to. |