A process for the preparation of a ptc thermal gate body and a process for the preparation of a ptc thermistor

摘要

A PTC thermistor 10 comprises, at least, a pair of electrodes 2, 3 and a thermistor body 1, disposed between the electrodes 2, 3, having a positive resistance vs. temperature characteristic. The thermistor body includes, at least, a thermoplastic resin and an electrically conductive particle made of a metal powder. The thermoplastic resin and electrically conductive particle have respective contents and a state of dispersion adjusted so as to yield a magnetization of 4.0×10^−5 to 6.0×10^−5 Wb·m·kg^−1 when a magnetic field of 3.98×10⁵ A·m^−1 is applied to the thermistor body.