US 11,864,325 B2
Method for forming metal pattern
Kenjiro Koshiji, Tsukuba (JP); Yuichi Makita, Tsukuba (JP); Noriaki Nakamura, Tsukuba (JP); Masato Kasuga, Tsukuba (JP); Yuusuke Ohshima, Tsukuba (JP); Hiroki Sato, Tsukuba (JP); Shigeyuki Ootake, Tsukuba (JP); and Hitoshi Kubo, Tsukuba (JP)
Assigned to TANAKA KIKINZOKU KOGYO K.K., Tokyo (JP)
Appl. No. 17/613,569
Filed by TANAKA KIKINZOKU KOGYO K.K., Tokyo (JP)
PCT Filed Jun. 18, 2020, PCT No. PCT/JP2020/024012
§ 371(c)(1), (2) Date Nov. 23, 2021,
PCT Pub. No. WO2020/256072, PCT Pub. Date Dec. 24, 2020.
Claims priority of application No. 2019-114430 (JP), filed on Jun. 20, 2019.
Prior Publication US 2022/0248538 A1, Aug. 4, 2022
Int. Cl. H05K 3/12 (2006.01); B05D 3/10 (2006.01); B05D 5/06 (2006.01); B05D 7/24 (2006.01); B05D 7/00 (2006.01); C09D 11/03 (2014.01); C09D 11/52 (2014.01)
CPC H05K 3/12 (2013.01) [B05D 3/10 (2013.01); B05D 5/067 (2013.01); B05D 7/24 (2013.01); B05D 7/54 (2013.01); C09D 11/03 (2013.01); C09D 11/52 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for forming a metal pattern on a pattern formation section set in a part or the whole of a region on a base material,
the base material comprising a fluorine-containing resin layer on a surface including at least the pattern formation section,
the method comprising: a step of forming a functional group on the pattern formation section on the surface of the fluorine-containing resin layer; and a step of applying a metal ink in which metal particles protected by an amine compound serving as a first protective agent and a fatty acid serving as a second protective agent are dispersed in a solvent to the surface of the base material to fix the metal particles on the pattern formation section,
wherein the fluorine-containing resin layer comprises a fluorine-containing resin having a surface free energy measured by the Owens-Wendt method of 13 mN/m or more and 20 mN/m or less, and
the metal ink comprises ethyl cellulose as an additive, wherein the only ethyl cellulose in the metal ink is a low-molecular weight ethyl cellulose having a number average molecular weight of 4,000 to 30,000.