Patent ID: 7041238

Claim:
An organic positive temperature coefficient (PTC) composite which realizes PTC characteristics by dispersing electrical conductive particles into organic polymer: wherein the conductive composite includes 0.2˜0.5 w % of peroxidic cross-linking agent added into 100 w % of the organic polymer for cross-linking reaction, and wherein the organic polymer comprises, (1) polyolefin component containing 30˜40 w % of high density polyethylene (HDPE), 20˜40 w % of low density polyethylene (LDPE) and 10˜30 w % ethylene-acrylic-acid (EAA) or ethylene-vinyl-acetate (EVA); and (2) 20˜30 w % of HDPE or LDPE, on which maleic anhydride is grafted, added to the polyolefin component, whereby a switching temperature and a trip time are controlled by suitably adjusting an added amount of the maleic anhydride grafted polyethylene.