Conductive polymer composition
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United States of America Patent
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Dec 25, 1990
Issued Date -
N/A
app pub date -
Oct 3, 1989
filing date -
Sep 20, 1988
priority date (Note) -
Expired
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Abstract
Electrical devices with improved resistance stability comprise a PTC element comprising a conductive polymer and two electrodes. The conductive polymer composition comprises an organic crystalline polymer and carbon black with a pH of less than 5.0. Particularly preferred conductive polymer compositions comprise carbon blacks which have a pH of less than 5.0, a dry resistivity R.sub.CB and a particle size D in nanometers such that R.sub.CB /D is at most 0.1. Electrical devices of the invention include heaters and circuit protection devices.
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