Patent ID: 6238598
Filing Date: 2001-05-29
Classification: H01C

Abstract:
A positive temperature coefficient (PTC) polymer blend composition, comprising:(a) a polymer mixture containing(i) a crystalline grafted polymer selected from a group consisting of grafted polyolefin, grafted polyolefin derivatives, and grafted copolymers of polyolefin and polyolefin derivatives, said grafted polymer being grafted by a polar group selected from a group consisting of carboxylic acids and derivatives thereof, and(ii) a crystalline non-grafted polymer selected from a group consisting of non-grafted polyolefin, non-grafted polyolefin derivatives, and non-grafted copolymers of polyolefin and polyolefin derivatives, said non-grafted polymer having a melting point substantially the same as that of said grafted polymer; and(b) a conductive particulate material.