Patent ID: 7368069

Claim:
A PTC thermistor comprising at least a pair of electrodes disposed so as to face each other, and a thermistor element disposed between said pair of electrodes and having a positive resistance-temperature characteristic, characterized in that said thermistor element is a molded body constituted by a high molecular matrix, a low molecular organic compound, and conductive particles having electric conductivity, the molecular weight of said high molecular matrix is between 10,000 and 400,000, the molecular weight of said low molecular organic compound is between 100 and 3,000, and said high molecular matrix is an olefin-type high molecular compound having a melting start temperature of between 85 and 95° C.; wherein said high molecular matrix is polyethylene; wherein said polyethylene is straight chain low density polyethylene obtained through a polymerization reaction using a metallocene catalyst; and wherein a melting point T 1 [° C.] of said high molecular matrix and a melting point T 2 [° C.] of said low molecular organic compound satisfy the condition denoted below as (A) 7° C.≦( T 1− T 2)≦40.5° C. ( A ).