Flame retardant conductive polymer composition device

H - Electricity – 01 – B

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H01B 1/06 (2006.01) C08K 3/00 (2006.01) C08K 3/04 (2006.01) C08K 3/22 (2006.01) C08K 5/00 (2006.01) C08K 13/02 (2006.01) H01B 1/24 (2006.01) H01C 7/02 (2006.01) H05B 3/14 (2006.01)

Patent

CA 2090229

A melt-extrudable conductive polymer composition which contains a polymer, a particulate conductive filler, a particulate non-conductive filler and a flame retardant, and heaters prepared from these compositions. Heaters can be prepared in standard strip heater form (1) where electrodes (5, 7) are embedded in the conductive polymer composition (3) which provides the resistive element. A polymeric jacket (9) surrounds the heater core. When compositions of the invention are tested in a standard arc propa- gation test, an arc will not propagate. Compositions which are preferred contain carbon black, Sb2O3, and a halogenated flame retardant.

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