Conductive polymers exhibiting PTC characteristics

摘要

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 DEG to 80 DEG C. These compositions are particularly useful in the form of heaters which self regulate at a temperature in the range of 0 DEG to 70 DEG C. Such heaters are particularly useful for freeze protection and for heating human and other animal bodies.