Method for producing dispersion liquid containing silver nanoparticles, and dispersion liquid containing silver nanoparticles

Patent metadata

Field	Value
Publication number	US-11091663-B2
Application number	US-201415030816-A
Country	US
Kind code	B2
Filing date	Oct 1, 2014
Priority date	Oct 24, 2013
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

The present invention provides a dispersion liquid containing silver nano-particles that develops excellent conductivity by low-temperature calcining and has silver nano-particles stably and well dispersed in a dispersion solvent, and a method for producing the dispersion liquid containing silver nano-particles. [solution] A method for producing a dispersion liquid containing silver nano-particles, comprising: mixing a silver compound with amines comprising an aliphatic monoamine (A) comprising an aliphatic hydrocarbon group and one amino group, said hydrocarbon group having 6 or more carbon atoms in total; and further comprising at least one of: an aliphatic monoamine (B) comprising an aliphatic hydrocarbon group and one amino group, said hydrocarbon group having 5 or less carbon atoms in total; and an aliphatic diamine (C) comprising an aliphatic hydrocarbon group and two amino groups, said hydrocarbon group having 8 or less carbon atoms in total; to form a complex compound comprising the silver compound and the amines; thermally decomposing the complex compound by heating to form silver nano-particles; and dispersing the silver nano-particles in a dispersion solvent containing an alcohol-based solvent and an aliphatic hydrocarbon-based solvent in a specific ratio.

First claim

The invention claimed is:

1. A dispersion liquid comprising
silver nano-particles having surfaces coated with a protective agent, and
a dispersion solvent comprising
70 to 80% by weight of an alcohol-based solvent wherein the alcohol-based solvent is at least one saturated aliphatic hydrocarbon alcohol selected from the group consisting of n-butanol, isobutanol, sec-butanol, tert-butanol, n-pentanol, n-hexanol, 2-ethylhexanol, n-heptanol, n-octanol, n-nonanol, n-decanol, undecanol, dodecanol, cyclopentanol, cyclohexanol, and cyclohexanemethanol; and
20 to 30% by weight of an aliphatic hydrocarbon-based solvent that disperses the silver nano-particles,
wherein the aliphatic hydrocarbon-based solvent is at least one selected from the group consisting of n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n-decane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, branched isomers thereof, isopropylcyclohexane, n-propylcyclohexane, n-butylcyclohexane, limonene, terpinene, and decalin,
wherein the protective agent comprises
at least one 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;
at least one aliphatic hydrocarbon monoamine (B) selected from the group consisting of n-butylamine, isobutylamine, sec-butylamine, tert-butylamine, isopentylamine, and tertpentylamine, and
at least one aliphatic hydrocarbon diamine (C) comprising an aliphatic hydrocarbon group and two amino groups, wherein aliphatic hydrocarbon diamine (C) is represented by a structural formula:
R 1 R 2 N—R—NH 2

wherein R represents a bivalent alkylene group, R 1 and R 2 may be the same or different from each other and each represent a methyl or ethyl group, and the total number of carbon atoms of R, R 1 and R 2 is 6 or less,
wherein an amount of the aliphatic monoamine (A) is from 10 mol % to 60 mol %, an amount of aliphatic monoamine (B) is from 10 mol % to 60 mol %, and an amount of aliphatic diamine (C) is from 10 mol % to 40 mol % based on a total amount of the protective agent, and
wherein the silver nano-particles are contained in an amount of 10% by weight or more.

2. The dispersion liquid according to claim 1 , wherein the dispersion liquid is an ink for printing.

3. The dispersion liquid according to claim 1 , wherein the dispersion liquid is an ink for ink-jet printing.

4. The dispersion liquid according to claim 1 , wherein the saturated aliphatic hydrocarbon alcohol contains a six-membered ring structure.

5. The dispersion liquid according to claim 1 , wherein said aliphatic hydrocarbon-based solvent is a member selected from the group consisting of isopropylcyclohexane, n-propylcyclohexane, n-butylcyclohexane, limonene, terpinene, and decalin.

6. The dispersion liquid according to claim 1 , wherein the silver nano-particles are contained in an amount of from 30% by weight to 80% by weight.

7. The dispersion liquid according to claim 1 , wherein the aliphatic hydrocarbon monoamine (A) is selected from the group consisting of hexylamine, heptylamine, octylamine, nonylamine, decylamine, undecylamine, and dodecylamine.

8. The dispersion liquid according to claim 1 , wherein the aliphatic hydrocarbon diamine (C) is selected from the group consisting of N,N-dimethylethylenediamine, N,N-diethylethylenediamine, N,N-dimethyl-1,3-propanediamine, and N,N-dimethyl-1,4-butanediamine.

Assignees

• Daicel Corp

Inventors

• Okamoto Kazuki
• Iguchi Yuki

Classifications

• H10P14/46

  using a liquid · CPC title

• H10D64/01316

  the conductor comprising a layer of elemental metal contacting the insulator, e.g. Ta, W, Mo or Al · CPC title

• B22F1/107

  containing organic material comprising solvents, e.g. for slip casting · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title

• B22F1/0545

  Dispersions or suspensions of nanosized particles · CPC title