Conductive polymer having positive temperature coefficient, method of controlling positive temperature coefficient property of the same and electrical device using the same
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United States of America Patent
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May 9, 2006
Grant Date -
Nov 25, 2004
app pub date -
Apr 25, 2002
filing date -
Aug 25, 2001
priority date (Note) -
Expired
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Abstract
PTC conductive polymer composition includes organic polymer containing polyolefin components essentially consisting of 30.about.40 w % high density polyethylene (HDPE), 20.about.40 w % low density polyethylene (LDPE) and 10.about.30 w % ethylene-acrylic-acid (EAA) or ethylene-vinyl-acetate (EVA), and 20.about.30 w % high or low density polyethylene which is denaturated into maleic anhydride compound; 60.about.120 w % electrical conductive particles dispersed into the organic polymer, the electrical conductive particles by weight of the organic polymer; and 0.2.about.0.5 w % peroxidic cross-linking agent added for cross-linking reaction by weight of the organic polymer. Thus, it becomes possible to control PTC characteristics such as switching temperature and trip time of an electrical device by suitably adjusting an added amount of the polyethylene, which is denaturated into maleic anhydride compound.
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