Positive temperature coefficient polymer composition and circuit protection device

Abstract

A positive temperature coefficient polymer composition includes a first polymer having a melting point ranging from 100° C. to 200° C., a second polymer having a melting point above 200° C., and a conductive filler. A weight ratio of the first polymer to the second polymer ranges from 1:5 to 5:1. A circuit protection device includes a polymeric positive temperature coefficient (PPTC) component and two electrodes respectively disposed on two opposite sides of the PPTC component. The PPTC component includes a polymer matrix and a conductive filler dispersed in the polymer matrix. The polymer matrix includes a first polymer that has a melting point ranging from 100° C. to 200° C., and a second polymer that has a melting point above 200° C. A weight ratio of the first polymer to the second polymer ranges from 1:5 to 5:1.

Dependencies are inferred from the claim text.