Patent ID: 8558655
Filing Date: 2013-10-15
Classification: H01C

Abstract:
1. A positive temperature coefficient polymer composition, comprising: a polymer component; and an electrically conductive filler component including an electro-conductive metallic particulate, an electro-conductive ceramic particulate, and an electro-conductive carbon particulate; wherein the weight ratio of said polymer component to said electrically conductive filler component ranges from 1:13 to 1:5.5, wherein the weight of said electro-conductive metallic particulate is higher than that of said electro-conductive ceramic particulate, and the weight of said electro-conductive ceramic particulate is higher than that of said electro-conductive carbon particulate, and wherein, based on the weight of said electrically conductive filler component, said electro-conductive carbon particulate is present in an amount ranging from 3.4 wt % to 6.8 wt %, said electro-conductive metallic particulate is present in an amount ranging from 59.6 wt % to 85.4 wt %, and said electro-conductive ceramic particulate is present in an amount ranging from 11.2 wt % to 33.7 wt %.