Ptc devices comprising oxygen barriers

Details Ptc devices comprising oxygen barriers Ptc devices comprising oxygen barriers

H - Electricity

01

L

356/121, 356/95

H01L 37/00 (2006.01) H01B 1/20 (2006.01) H01C 7/02 (2006.01)

Patent

CA 1127320

Abstract of the Disclosure The invention relates to electrical devices com- prising conductive polymer PTC elements. According to the invention, the electrical stability of such devices is improved by restricting access of air to the PTC element so that it absorbs oxygen at a rate less than 10-6 cc/sec/gram. The devices are for example circuit control devices or self- limiting heaters. Preferred PTC elements comprise a polymer having dispersed therein carbon black and an additive which stabilises the polymer against degradation, especially an organic antioxidant. The oxygen barrier may for example be a layer of a polymeric composition or a self-supporting container principally made of metal and filled with an inert gas.

340963

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