PTC conductive polymer composition containing carbon black having large particle size and high DBP absorption

摘要

A conductive polymer composition exhibiting positive temperature coefficient behavior comprising:PP(a) a crystalline polymer having dispersed thereinPP(b) carbon black having an average particle diameter of at least about 60 millimicrons and a DBP absorption of at least about 80 cc/100 g.P PCircuit protection devices containing a thin layer of this conductive polymer composition between laminar electrodes provide high breakdown voltage in combination with very low resistance and are useful for protecting high- current/high voltage battery-powered devices.