Shanghai Changyuan Wayon Circuit Protection Co., Ltd.

Congwu Li

Jun Wang

Yutang Liu

Daohua Gao

Zhengping Liu

Quanquan Yang

Quan-quan Yang

A PTC conductive composite material and the overcurrent protection device made of the material are disclosed. The PTC conductive composite material includes: (a) A matrix of crystalline polymer material at least, occupies 20%-70% of the volume fraction of the PTC conductive composite material, (b) One kind of conductive filler occupies 30%-80% of the volume fraction of the material. The solid solution conductive filler is uniformly dispersed in the polymer material, whose average particle size ranges from 0.1 &#x3bc;m to 10 &#x3bc;m, and the volume resistivity is no more than 300 &#x3bc;&#x3a9;&#xb7;cm. The overcurrent protection device prepared by using the PTC conductive composite material as described above includes two metal foils, which are made into a sandwich, separated by a layer of the PTC conductive composite material. And the advantages of the overcurrent protection device of the invention are low resistance, good reproducibility of resistance and well PTC intensity.

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Shanghai, China

Congwu Li