Conductive polymers exhibiting PTC characteristics

Electric heating – Heating devices – With heating unit structure

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219505, 219528, 219549, 252511, 264105, 338 22R, 338 22SD, H05B 310

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045146209

ABSTRACT:
Conductive polymer compositions which exhibit PTC behavior and comprise carbon black (or other particulate conductive filler) dispersed in a cross-linked polymer component comprising a cycloolefin polymer having a crystallinity of at least 5% and a melting point in the range 0.degree. to 80.degree. C. These compositions are particularly useful in the form of heaters which self regulate at a temperature in the range of 0.degree. to 70.degree. C. Such heaters are particularly useful for freeze protection and for heating human and other animal bodies.

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