Littelfuse, Inc.

Littelfuse Electronics (shanghai) Co., Ltd.

Mingjun Jin

Jianhua Chen

Wei Jun Zheng

Zhiyong Zhou

Cheng Hu

Yingsong Fu

The present invention provides a conductive polymer composition, a conductive polymer sheet, an electrical device, and their preparation methods. The conductive polymer composition of the present invention includes a polymer and a conductive powder at a volume ratio of 35:65 to 65:35. The polymer includes at least one semicrystalline polymer selected from polyolefin, a copolymer of at least one olefin and at least one non-olefinic monomer copolymerizable therewith, and a thermoformable fluorine-containing polymer. The stated conductive powder includes at least one powder of a transition metal carbide, a transition metal carbon silicide, a transition metal carbon aluminide, and a transition metal carbon stannide. And the stated size distribution of the conductive powder satisfies: 20&#x3e;D/D&#x3e;6, where Ddenotes a corresponding particle size when a cumulative particle-size distribution percent in the conductive powder reaches 50%, and Ddenotes a maximum particle size. The stated conductive polymer composition has excellent processability, and can be used for preparing a PPTC device with ultralow resistance and stability in air without an oxygen barrier coating.

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Shanghai, China

Mingjun Jin