Patent ID: 7544311

Claim:
A positive temperature coefficient polymer composition comprising: (a) a non-elastomeric polymer mixture in an amount from 35 wt % to 49 wt % based on the weight of said polymer composition, wherein the mixture comprises 0.5 wt % to 10 wt % of a crystalline grafted polymer; (b) a conductive particulate material in an amount from 31 wt % to 37 wt % based on the weight of said polymer composition; (c) a voltage resistance-enhancing agent that comprises a particulate metal oxide material in an amount from 10 wt % to 30 wt % based on the weight of said polymer composition; and (d) a polymer stabilizer that comprises a thermoplastic elastomer in an amount from 4 wt % to 10 wt % based on the weight of said polymer composition.