# US 2019/0168308 A1 · Method for producing copper powder

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- Number: US 2019/0168308 A1
- Document ID: US20190168308A1
- Status: Published application
- Kind: A1
- Application number: 16/321,541
- Filed: 2017-07-05
- Published: 2019-06-06
- Earliest claimed: 2016-08-03
- Assignees: Adeka Corporation
- Applicants: Adeka Corporation
- Inventors: Yusuke NUIDA; Hiroshi MORITA
- Web page: https://patentgrep.com/patent/US20190168308A1

## CPC

- B22F 9/24: starting from liquid metal compounds, e.g. solutions
- B22F 1/00: Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F 9/20: starting from solid metal compounds
- B22F 9/30: with decomposition of metal compounds, e.g. by pyrolysis
- B22F 2301/10: Copper
- B22F 2304/058: Particle size above 300 nm up to 1 micrometer
- B22F 2304/10: Micron size particles, i.e. above 1 micrometer up to 500 micrometer
- H01B 1/02: mainly consisting of metals or alloys
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

Provided is a method for producing copper powder, including using, as raw materials, (A) cuprous oxide, (B) at least one selected from the group consisting of boric acid and salts thereof, (C) at least one selected from the group consisting of ammonia and an ammonium ion source, and (D) at least one selected from the group consisting of monosaccharides, disaccharides, and polysaccharides. Component (C) preferably includes at least one selected from the group consisting of ammonia, ammonium chloride, ammonium bromide, ammonium formate, and ammonium acetate.

## Claims

### Claim 1

A method for producing copper powder, comprising using, as raw materials, (A) cuprous oxide, (B) at least one selected from the group consisting of boric acid and salts thereof, (C) at least one selected from the group consisting of ammonia and an ammonium ion source, and (D) at least one selected from the group consisting of monosaccharides, disaccharides, and polysaccharides.

### Claim 2 (depends on 1)

The method for producing copper powder according to claim 1, wherein component (C) is at least one selected from the group consisting of ammonia, ammonium chloride, ammonium bromide, ammonium formate, and ammonium acetate.

### Claim 3 (depends on 1)

The method for producing copper powder according to claim 1, wherein component (D) is at least one selected from the group consisting of glucose, fructose, galactose, mannose, and arabinogalactan.

### Claim 4 (depends on 1)

The method for producing copper powder according to claim 1, wherein component (B) is boric acid.

### Claim 5 (depends on 1)

The method for producing copper powder according to claim 1, wherein the copper powder has an average particle diameter D50 of from 0.5 μm to 10 μm.

### Claim 6 (depends on 1)

The method for producing copper powder according to claim 1, comprising using component (B) in an amount of from 0.05 mole to 2.0 moles, component (C) in an amount of from 0.05 mole to 5.0 moles, and component (D) in an amount of from 0.05 mole to 5.0 moles with respect to 1 mole of component (A).