Conductive Paste, Conductive Film, and Method for Producing Conductive Film

Patent metadata

Field	Value
Publication number	US-2022195229-A1
Application number	US-201917604713-A
Country	US
Kind code	A1
Filing date	May 29, 2019
Priority date	May 29, 2019
Publication date	Jun 23, 2022
Grant date	—

Abstract

Provided is a technique for a conductive paste having high conductivity and low cost. The conductive paste includes a conductive filler, a polymer, and a solvent, wherein the conductive filler includes co-continuous fibrous carbon having a three-dimensional network structure in which carbon is branched.

First claim

1 . A conductive paste comprising:
a conductive filler; a polymer; and a solvent, wherein the conductive filler comprises co-continuous fibrous carbon having a three-dimensional network structure in which carbon is branched.

2 . The conductive paste according to claim 1 , wherein the co-continuous fibrous carbon has a fiber diameter of 10 nm to 200 nm, a fiber length of 300 nm to 2 μm, and a secondary particle size of 1 μm to 50 μm.

3 . The conductive paste according to claim 1 , wherein the conductive filler comprises at least one selected from metal particles and carbon powder in addition to the co-continuous fibrous carbon.

4 . The conductive paste according to claim 3 , wherein the metal particles comprise at least one selected from the group consisting of gold, silver, copper, platinum, nickel, titanium, iron, magnesium, aluminum, calcium, cobalt, zinc, gallium, germanium, zirconium, molybdenum, ruthenium, rhodium, palladium, cadmium, indium, tin, tantalum, tungsten, osmium, iridium, lead, vanadium, chromium, manganese, niobium, molybdenum, and technetium.

5 . The conductive paste according to claim 3 , wherein the carbon powder comprises at least one selected from the group consisting of fullerenes, carbon nanotubes, graphene, graphite, and amorphous carbon.

6 . A conductive film obtained by printing the conductive paste according to claim 1 on a substrate and then drying the conductive paste.

7 . A method for producing a conductive film, comprising:
crushing co-continuous fibrous carbon having a three-dimensional network structure in which carbon is branched; mixing the crushed co-continuous fibrous carbon, a polymer, and a solvent to obtain a conductive paste; printing the conductive paste on a substrate; and drying the conductive paste to remove the solvent to obtain the conductive film.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Nohara Masaya
• Minowa Hironobu
• Iwata Mikayo
• Taguchi Hiroaki
• Komatsu Takeshi

Classifications

• C09D11/52 Primary

  Electrically conductive inks · CPC title

• C09D11/104

  Polyesters · CPC title

• C09D11/037

  characterised by the pigment · CPC title

• H01B1/24 Primary

  the conductive material comprising carbon-silicon compounds, carbon or silicon · CPC title

• B41M3/006

  Patterns of chemical products used for a specific purpose, e.g. pesticides, perfumes, adhesive patterns; use of microencapsulated material; Printing on smoking articles · CPC title