Toray Industries, Inc.

Kazuyoshi Higuchi

Kenichi Sato

Hajime Kato

Masahito Yoshikawa

Keisuke Fujita

Hidekazu Nishino

Naoyo Okamoto

Masayuki Maeda

Shuko Ikeuchi

Shiho Tanaka

Disclosed is a composition containing carbon nanotubes which meets all of the following conditions (1) to (4). (1) When observed via transmission electron microscopy, at least 50 out of every 100 carbon nanotubes are double-walled carbon nanotubes. (2) The carbon nanotubes have an average outer diameter in the range of 1.0 to 3.0 nm. (3) During thermogravimetric analysis under atmosphere at a temperature increase rate of 10&#xb0; C./minute, a high temperature combustion peak is at 700 to 850&#xb0; C., and the relationship between low temperature weight loss (TG(L)) and high temperature weight loss (TG(H)) is TG(H)/(TG(L)+TG(H))&#x2267;0.75. (4) The composition containing carbon nanotubes has a volume resistance value between 1.0&#xd7;10&#x3a9;&#xb7;cm and 1.0&#xd7;10&#x3a9;&#xb7;cm, inclusive. The disclosed composition containing carbon nanotubes primarily has double-walled carbon nanotubes with high electrical conductivity and high heat resistance.

Composition containing carbon nanotubes, catalyst for producing carbon nanotubes, and aqueous dispersion of carbon nanotubes

Provided is a method for producing a carbon nanotube, wherein a catalyst for carbon nanotube production comprising a powdery catalyst supporting a metal on magnesia and having a bulk density of 0.30 g/mL to 0.70 g/mL, in a vertical reactor, is disposed over the whole area in a horizontal cross section direction of the reactor, in such state a carbon-containing compound flowed in a vertical direction inside the reactor is contacted with the catalyst at 500 to 1200&#xb0; C., thereby carbon nanotubes of uniformity and high quality are efficiently synthesized in a large amount.

Process for producing carbon nanotube and catalyst for carbon nanotube production

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Nagoya, Japan

Kazuyoshi Higuchi