Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1979-11-30
1982-02-09
Albritton, C. L.
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
219505, 338275, H01C 702
Patent
active
043152376
ABSTRACT:
Electrical devices comprising PTC elements have improved electrical stability when they comprise an oxygen barrier which restricts access of air to the element so that the PTC element absorbs oxygen at a rate less than 10.sup.-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 stabilizes 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.
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J. Meyer, Polymer Engineering and Science, "Glass Transition Temperature as a Guide to Selection of Polymers Suitable for PTC Materials", vol. 13, No. 6, 11/73.
Gotcher Alan J.
Middleman Lee M.
Albritton C. L.
Raychem Corporation
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