Electrically resistive PTC devices containing conductive polymers
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United States of America Patent
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May 27, 2003
Issued Date -
N/A
app pub date -
Mar 13, 1997
filing date -
Jun 8, 1994
priority date (Note) -
Expired
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Abstract
An electrical resistive device in which an element composed of a conductive polymer is positioned in contact with the surface layer of one or more metal electrodes. The metal electrode contains a base layer which includes a first metal, an intermediate metal layer which includes a metal that is different from the first metal, and a surface layer which (i) includes a second metal, (ii) has a center line average roughness R.sub.a of at least 1.3, and (iii) has a reflection density R.sub.d of at least 0.60. The conductive polymer composition preferably exhibits PTC behavior density requirements, which may be, for example, circuit protection devices or heaters, have improved thermal and electrical performance over devices prepared with electrodes which do not meet the center line average roughness and reflection density requirements.
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