US Patent No. 9,860,983

METHOD FOR PRODUCING SILVER NANOPARTICLES, SILVER NANOPARTICLES, AND SILVER COATING COMPOSITION


Patent No. 9,860,983
Issue Date January 02,2018
Title Method For Producing Silver Nanoparticles, Silver Nanoparticles, And Silver Coating Composition
Inventorship Masato Kurihara, Yamagata (JP)
Kazuki Okamoto, Himeji (JP)
Yuki Iguchi, Himeji (JP)
Assignee NATIONAL UNIVERSITY CORPORATION YAMAGATA UNIVERSITY, Yamagata-shi (JP) DAI...

Claim of US Patent No. 9,860,983

1. Coated silver nano-particles produced by a method comprising:
(a) preparing an amine mixture liquid comprising:
(i) an aliphatic hydrocarbon monoamine (A) comprising an aliphatic hydrocarbon group and one amino group, said aliphatic hydrocarbon
group having 6 or more carbon atoms in total,

(ii) an aliphatic hydrocarbon monoamine (B) comprising an aliphatic hydrocarbon group and one amino group, said aliphatic
hydrocarbon group having 2 or more and 4 or less carbon atoms in total, and

(iii) an aliphatic hydrocarbon diamine (C) comprising an aliphatic hydrocarbon group and two amino groups, said aliphatic
hydrocarbon group having 7 or less carbon atoms in total wherein aliphatic hydrocarbon diamine (C) is represented by a structural
formula:

R1R2N—R—NH2
wherein R represents a bivalent ethylene or propylene group, R1 and R2 may be the same or different from each other and each represent a methyl or an ethyl group, and the total number of carbon
atoms of R, R1, and R2 is 7 or less,

(b) mixing a silver compound and the amine mixture liquid to form a complex compound comprising the silver compound and the
amines; and

(c) thermally decomposing the complex compound by heating to form coated silver nano-particles,
wherein each of the aliphatic hydrocarbon amine (A), the aliphatic hydrocarbon amine (B), and the aliphatic hydrocarbon diamine
(C) does not have, on its hydrocarbon group, a hetero atom, and

wherein a surface of the coated silver nano-particles comprises a protective agent, comprising the aliphatic hydrocarbon monoamine
(A), the aliphatic hydrocarbon monoamine (B) and the aliphatic hydrocarbon diamine (C).