US 12,170,155 B2
Conductive paste, preparation method thereof, and preparation method of conductive film
Jianshi Tang, Beijing (CN); Zhenxuan Zhao, Beijing (CN); Yuan Dai, Shenzhen (CN); Wangwei Lee, Shenzhen (CN); Zhengyou Zhang, Shenzhen (CN); Jian Yuan, Beijing (CN); Huaqiang Wu, Beijing (CN); He Qian, Beijing (CN); and Bin Gao, Beijing (CN)
Assigned to TSINGHUA UNIVERSITY, Beijing (CN); and TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED, Shenzhen (CN)
Filed by Tsinghua University, Beijing (CN); and Tencent Technology (Shenzhen) Company Limited, Shenzhen (CN)
Filed on May 18, 2022, as Appl. No. 17/747,906.
Application 17/747,906 is a continuation of application No. PCT/CN2021/090228, filed on Apr. 27, 2021.
Claims priority of application No. 202010352024.9 (CN), filed on Apr. 28, 2020.
Prior Publication US 2022/0277866 A1, Sep. 1, 2022
Int. Cl. H01B 1/24 (2006.01); C08K 3/04 (2006.01); C09D 5/24 (2006.01); C09D 7/40 (2018.01); C09D 7/61 (2018.01); C09D 175/04 (2006.01)
CPC H01B 1/24 (2013.01) [C08K 3/041 (2017.05); C08K 3/045 (2017.05); C08K 3/046 (2017.05); C09D 5/24 (2013.01); C09D 7/61 (2018.01); C09D 7/70 (2018.01); C09D 175/04 (2013.01); C08K 2201/001 (2013.01); C08K 2201/011 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for preparing a conductive film, comprising:
obtaining a conductive paste, the conductive paste comprising a thermoplastic polyurethane, conductive particles, and an organic solvent, the conductive particles and the thermoplastic polyurethane being mixed in the organic solvent at a weight ratio of the conductive particles relative to the thermoplastic polyurethane ranging from 3:7 to 95:5, and the thermoplastic polyurethane being dispersed in the form of particles among the conductive particles;
adjusting a viscosity of the conductive paste to obtain a preset viscosity according to requirements of an application scenario;
applying the obtained conductive paste on a substrate;
drying the conductive paste on the substrate to obtain a conductive film; and
removing a portion of the conductive film from the substrate by using N-methylpyrrolidone according to a predefined pattern.