Conductive particles, conductive powder, conductive polymer composition and anisotropic conductive sheet

Patent metadata

Field	Value
Publication number	US-2017333989-A1
Application number	US-201515520855-A
Country	US
Kind code	A1
Filing date	Sep 29, 2015
Priority date	Oct 24, 2014
Publication date	Nov 23, 2017
Grant date	—

Abstract

A conductive particle including a conductive powder, a conductive polymer composition, and an anisotropic conductive sheet, each of which has a particularly smaller volume resistivity and better conductivity than those of the related art, and is desirably inexpensive. A conductive particle includes a first plating layer (pure Ni plating layer or Ni plating layer containing 4.0 mass % or less of P) covering the surface of a spherical Ni core containing 5 mass % to 15 mass % or less of P. The conductive particle may further include a Au plating layer having a thickness of from 5 nm to 200 nm and covering the surface of the first plating layer.

First claim

1 . A conductive particle, comprising:
a spherical Ni core containing 5 mass % or more and 15 mass % or less of P; and a first plating layer covering a surface of the Ni core, wherein the first plating layer comprises a pure Ni plating layer or a Ni plating layer containing 4.0 mass % or less of P.

2 . The conductive particle according to claim 1 , wherein the first plating layer has a thickness of 0.1 μm or more and 10 μm or less.

3 . The conductive particle according to claim 1 , wherein the Ni core has a diameter of 1 μm or more and 100 μm or less.

4 . The conductive particle according to claim 1 , further comprising a second plating layer covering a surface of the first plating layer, wherein the second plating layer comprises a Au plating layer having a thickness of 5 nm or more and 200 nm or less.

5 . A conductive powder, comprising the conductive particles of claim 1 , the conductive powder having a median diameter d50 in a cumulative volume distribution curve of 3 μm or more and 100 μm or less, and satisfying [(d90−d10)/d50]≦0.8.

6 . A conductive polymer composition, comprising:
the conductive powder of claim 5 ; and a polymer, wherein the polymer comprises a rubber, a thermoplastic resin, a thermosetting resin, or a photocurable resin.

7 . An anisotropic conductive sheet, comprising the conductive polymer composition of claim 6 , wherein the conductive particles are arranged in a thickness direction of the anisotropic conductive sheet.

Assignees

• Hitachi Metals Ltd

Inventors

• Mori Hidehito
• Nozaka Tsutomu

Classifications

• B22F1/00

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• B22F1/17

  Metallic particles coated with metal · CPC title

• H01B1/22

  the conductive material comprising metals or alloys · CPC title

• H01B5/16

  comprising conductive material in insulating or poorly conductive material, e.g. conductive rubber (H01B1/14, H01B1/20 take precedence; insulating bodies with conductive admixtures H01B17/64; conductive paints C09D5/24) · CPC title

• C22C19/03

  based on nickel · CPC title