Process for producing carbon nanotube composition and carbon nanotube composition

Patent metadata

Field	Value
Publication number	US-9748016-B2
Application number	US-201214360746-A
Country	US
Kind code	B2
Filing date	Oct 26, 2012
Priority date	Nov 28, 2011
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A method of the present invention for producing a carbon nanotube includes: a dispersing step of dispersing a carbon nanotube in a solvent by carrying out a dispersion treatment that brings about a cavitation effect, the carbon nanotube having an average diameter (Av) and a diameter distribution (3σ) that satisfy 0.60>3σ/Av>0.20; and a mixing step of mixing carbon nanotube slurry obtained in the dispersing step with latex.

First claim

The invention claimed is:

1. A method for producing a carbon nanotube composition, comprising:
a dispersing step of dispersing a carbon nanotube in a solvent to obtain a carbon nanotube slurry by carrying out a dispersion treatment that brings about a cavitation effect, the carbon nanotube having an average diameter (Av) and a diameter distribution (3σ) that satisfy 0.60>3σ/Av>0.50; and
a mixing step of mixing the carbon nanotube slurry with latex;

wherein:
the solvent comprises a dispersant;
an amount of the carbon nanotube dispersed in the solvent is 0.01 part by weight or more and 1 part by weight or less based on 100 parts by weight of a whole amount of the solvent containing the dispersant; and
the composition exhibits a volume conductivity of at least 0.8 S/cm.

2. The method as set forth in claim 1 , wherein the dispersion treatment is at least one selected from the group consisting of a dispersion treatment by ultrasonic waves, a dispersion treatment by a jet mill, and a dispersion treatment by high-shear stirring.

3. The method as set forth in claim 1 , wherein the carbon nanotube has a BET specific surface area of 600 m 2 /g or more.

4. The method as set forth in claim 1 , further comprising:
a coagulating step of coagulating a solid content in a mixture obtained in the mixing step.

5. The method as set forth in claim 1 , wherein the latex is a liquid in which an elastomer is dispersed.

6. The method as set forth in claim 5 , wherein the elastomer is nitrile rubber having a nitrile structure which constitutes 20 weight % or more and 55 weight or less of an entire weight of the nitrile rubber.

7. The method as set forth in claim 1 , wherein the carbon nanotube has a structural length of 100 μm or more and 5,000 μm or less.

8. The method as set forth in claim 1 , wherein the carbon nanotube has a G/D ratio of 1 or more and 20 or less.

9. The method as set forth in claim 1 , wherein the carbon nanotube has a weight density of 0.002 g/cm 3 to 0.2 g/cm 3 .

10. A carbon nanotube composition which is produced by the method as set forth in claim 1 .

Assignees

• Zeon Corp

Inventors

• Shigeta Masahiro
• Nagamune Tsutomu
• Hoang The Ban
• Uejima Mitsugu

Classifications

• C01B2202/32

  Specific surface area · CPC title

• C08K3/041 Primary

  Carbon nanotubes · CPC title

• H01B1/24 Primary

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

• C08L15/005

  Hydrogenated nitrile rubber · CPC title

• C08J3/215

  at least one additive being also premixed with a liquid phase · CPC title