PTC composition and PTC device comprising it
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United States of America Patent
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Dec 7, 2004
Grant Date -
N/A
app pub date -
Oct 11, 2002
filing date -
Oct 28, 2000
priority date (Note) -
Expired
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Abstract
The present invention relates to a conductive polymer composition which exhibits PTC characteristics (PTC composition) and a PTC device comprising it, wherein the PTC composition comprises: a) at least one crystalline olefin-based polymer and at least one ionomer; and, b) electrically conductive particles which have been dispersed in polymer matrix formed by a). The PTC composition according to the present invention has an enhanced adhesion to electrodes, which minimizes contact resistance and increases the maximum working current (hold current). The PTC device comprising the PTC composition can be used as a circuit protection device which protects circuit from overflowing and which holds initial resistance value although it is reused after multiple short circuit have taken place.
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