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Flame Retarding Polycarbonate/ ABS Blends with a Brominated Phosphate

FMC Corporation Box 8 Princeton, NJ 08543

Triphenyl phosphate and a brominated phosphate were compared as flame retardant additives for polycarbonate/ABS blends. The concentration of the flame retardant was varied from 6 to 14% and the polycarbonate/ABS ratio was varied from 3/1 to 1/1. A commercial polycarbonate/ABS blend is 3/1 with about 14% triphenyl phosphate for a UL-94 V-0/5V rating. Reducing the polycarbonate or the flame retardant level gives products which do not pass UL-94 V-0/5V. Compositions containing the brominated phosphate with UL-94 V-0/5V ratings include use of 6% flame retardant or 14% flame retardant with polymer ratios down to 1/1. Cone calorimetry data show significantly longer time to ignition, lower total heat release and lower peak heat release rate for the brominated phosphate-containing resin. Mechanical properties are also given.

Key Words: flame retardants • polycarbonate/ABS blends • triphenyl phos phate flame retardant • brominated phosphate flame retardant • flame retarded polycarbonate/ABS blend.

Journal of Fire Sciences, Vol. 9, No. 4, 285-295 (1991)
DOI: 10.1177/073490419100900404


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