Carbon nanotube fiber and method for producing same

Patent metadata

Field	Value
Publication number	US-9802823-B2
Application number	US-201515114581-A
Country	US
Kind code	B2
Filing date	Jan 29, 2015
Priority date	Feb 3, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A carbon nanotube fiber is provided that that has excellent properties such as electrical conductivity, thermal conductivity, and mechanical characteristics. The carbon nanotube fiber includes an assembly of a plurality of carbon nanotubes. The plurality of carbon nanotubes includes one or more carbon nanotubes having at least partially collapsed structures. Furthermore, a method for producing a carbon nanotube fiber is provided that includes spinning a carbon nanotube dispersion liquid containing a plurality of carbon nanotubes including one or more carbon nanotubes having at least partially collapsed structures, a dispersant, and a solvent by extruding the carbon nanotube dispersion liquid into a coagulant liquid.

First claim

The invention claimed is:

1. A carbon nanotube fiber comprising
an assembly of a plurality of carbon nanotubes, wherein
the plurality of carbon nanotubes includes one or more carbon nanotubes having at least partially collapsed structures, and
an average width of collapsed sections in the one or more carbon nanotubes having at least partially collapsed structures is at least 5 nm and no greater than 9 nm.

2. The carbon nanotube fiber of claim 1 , wherein
the one or more carbon nanotubes having at least partially collapsed structures are present in a proportion of at least 5 in 100 carbon nanotubes.

3. The carbon nanotube fiber of claim 1 , wherein
the one or more carbon nanotubes having at least partially collapsed structures have single-walled structures.

4. The carbon nanotube fiber of claim 1 , wherein
the one or more carbon nanotubes having at least partially collapsed structures each have a section into which fullerenes are not inserted upon being subjected to fullerene insertion treatment.

5. The carbon nanotube fiber of claim 1 , wherein
the plurality of carbon nanotubes has a BET specific surface area of at least 600 m 2 /g.

6. The carbon nanotube fiber of claim 1 , wherein
a density of the carbon nanotube fiber is at least 1.0 g/cm 3 and no greater than 1.5 g/cm 3 .

7. A method for producing a carbon nanotube fiber, comprising
spinning a carbon nanotube dispersion liquid containing a plurality of carbon nanotubes including one or more carbon nanotubes having at least partially collapsed structures, a dispersant, and a solvent by extruding the carbon nanotube dispersion liquid into a coagulant liquid, wherein
an average width of collapsed sections in the one or more carbon nanotubes having at least partially collapsed structures is at least 5 nm and no greater than 9 nm.

8. The method for producing a carbon nanotube fiber of claim 7 , further comprising
preparing the carbon nanotube dispersion liquid by subjecting a coarse dispersion liquid containing the plurality of carbon nanotubes, the dispersant, and the solvent to dispersion treatment that brings about a cavitation effect or a crushing effect in order to disperse the plurality of carbon nanotubes.

Assignees

• Zeon Corp

Inventors

• Uejima Mitsugu

Classifications

• C01B32/159

  single-walled · CPC title

• D01F9/12 Primary

  Carbon filaments; Apparatus specially adapted for the manufacture thereof · CPC title

• C01B32/174

  Derivatisation; Solubilisation; Dispersion in solvents · CPC title

• D01F1/09

  for making electroconductive or anti-static filaments · CPC title

• D10B2401/16

  antistatic; conductive · CPC title