Patent ID: 9175146
Filing Date: 2015-11-03
Classification: C08K

Abstract:
1. A positive temperature coefficient composition comprising: a) from about 30 to about 90% by weight of a semi-crystalline thermoplastic polymer having a degree of crystallinity of at least 5%; b) from about 5 to about 50% by weight carbon black; and c) from about 5 to about 50% by weight graphite having a carbon content of at least 99% and an average particle size of from 10 microns to 300 microns; wherein the positive temperature coefficient composition has an improved thermal conductivity as compared to a composition consisting of the thermoplastic polymer and the carbon black; wherein the composition has a room temperature volume resistivity at 23° C. of from 2.01 Ω·cm to 169.19 Ω·cm.