The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 2019
Filed:
Jun. 30, 2016
Littelfuse Electronics (Shanghai) Co., Ltd., Shanghai, CN;
Littelfuse, Inc., Chicago, IL (US);
Yingsong Fu, Shanghai, CN;
Jianhua Chen, Sunnyvale, CA (US);
Mingjun Jin, Shanghai, CN;
Zhiyong Zhou, Shanghai, CN;
Wei Zheng, Shanghai, CN;
Cheng Hu, Shanghai, CN;
LITTELFUSE ELECTRONICS (SHANGHAI) CO., LTD, Shanghai, CN;
LITTELFUSE, INC., Chicago, IL (US);
Abstract
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>D/D>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.