Compositions – Electrically conductive or emissive compositions
Patent
1998-11-16
2000-06-13
Kopec, Mark
Compositions
Electrically conductive or emissive compositions
252511, 252512, 252513, 252514, 338 22R, H01B 122, H01B 124, H01C 702
Patent
active
060745762
ABSTRACT:
The invention provides polymeric PTC compositions and electrical PTC devices that have a high voltage capability and are capable of operating at alternating current (AC) voltages of 110 to 130 volts or greater, such as those present in household AC electrical lines. The polymeric compositions demonstrate a high PTC effect of at least 10.sup.4 to 10.sup.5 and a low initial resistivity at 25.degree. C. of 100 .OMEGA.cm or less, preferably 10 .OMEGA.cm or less, resulting in electrical PTC devices having a resistance at 25.degree. C. of 500 m.OMEGA. or less, preferably about 7.5 m.OMEGA. to about 200 m.OMEGA., typically about 10 m.OMEGA. to 100 m.OMEGA.. The devices of the invention can withstand a voltage of 110 to 130 VAC or greater without failure for at least 4 hours, preferably up to 24 hours or more, after reaching the switching temperature.
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Khadkikar Prasad S.
Zhao Liren
Kopec Mark
Therm-O-Disc Incorporated
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