US 11,980,935 B2
Copper particles and method for producing same
Mizuki Akizawa, Shimonoseki (JP); and Takafumi Sasaki, Shimonoseki (JP)
Assigned to Mitsui Mining & Smelting Co., Ltd., (JP)
Appl. No. 17/911,511
Filed by Mitsui Mining & Smelting Co., Ltd., Tokyo (JP)
PCT Filed Dec. 15, 2020, PCT No. PCT/JP2020/046651
§ 371(c)(1), (2) Date Sep. 14, 2022,
PCT Pub. No. WO2021/199512, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-062134 (JP), filed on Mar. 31, 2020.
Prior Publication US 2023/0107436 A1, Apr. 6, 2023
Int. Cl. B22F 1/05 (2022.01); B22F 1/00 (2022.01); B22F 1/16 (2022.01); H01B 1/02 (2006.01); H01B 1/22 (2006.01); H01B 5/14 (2006.01)
CPC B22F 1/00 (2013.01) [B22F 1/05 (2022.01); B22F 1/16 (2022.01); H01B 1/026 (2013.01); H01B 5/14 (2013.01); B22F 2301/10 (2013.01); B22F 2304/10 (2013.01)] 12 Claims
OG exemplary drawing
 
1. Copper particles each comprising a core particle made of copper and a coating layer that coats a surface of the core particle,
wherein the coating layer comprises a surface treatment agent containing a copper salt of an aliphatic organic acid,
an average particle size of primary particles of the copper particles is in a range of 0.05 μm to 1.0 μm, and
the copper particles have an infrared absorption peak in a range of 1504 to 1514 cm−1 and no infrared absorption peak in a range of 1584 to 1596 cm−1.