Conductive polymer composition, conductive polymer sheet, electrical device, and their preparation methods
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>D100/D50>6, where D50 denotes a corresponding particle size when a cumulative particle-size distribution percent in the conductive powder reaches 50%, and D100 denotes 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.
LITTELFUSE ELECTRONICS (SHANGHAI) CO., LTD LITTELFUSE, INC.
H C H C C C C C H C C C C
H01C C08L H01C C08L C08L C08L C08K C01P H01B C08F C08L C08F C08K
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Jianhua Zhiyong Yingsong Wei Cheng Mingjun
Chen Zhou Fu Zheng Hu Jin