PTC devices and their composition
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United States of America Patent
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Sep 3, 1991
Grant Date -
N/A
app pub date -
Apr 4, 1990
filing date -
Apr 4, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
PTC Devices and PTC compositions described herein comprise a blend of at least three carbon blacks as a particulate filler in a fluorinated polymer to achieve a substantial PTC effect and operability over a wide temperature range including temperatures prevailing in a steam environment. Two of the carbon blacks are selected to impart PTC effect to the composition. The third carbon black is selected to adjust the resistive properties of the composition into the range of commercial usage and to impart uniformity of the resistive properties within a given batch as well as from one batch of mix to the next.
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