Toray Industries, Inc.

Naoyo Okamoto

Kenichi Sato

Hidekazu Nishino

Hajime Kato

Masao Tomikawa

Ryoji Okuda

Masahito Yoshikawa

Kazunori Hondo

Takayoshi Hirai

Satoshi Yoshida

Shuko Ikeuchi

Kazuyoshi Higuchi

Shiho Tanaka

Shuko Numata

An aggregate of carbon nanotubes has an acid adsorption amount equal to or greater than 0.6 mass % and equal to or less than 12 mass %, which is obtained by subjecting a starting material composition containing carbon nanotubes to a two-stage wet oxidation treatment. A method of producing an aggregate of carbon nanotubes includes a primary oxidation treatment step, wherein a starting material composition containing carbon nanotubes is subjected to a wet oxidation treatment to give a primary treated aggregate of carbon nanotubes having a ratio (G/D ratio) of the height of G band to that of D band in Raman spectroscopic analysis at 532 nm wavelength equal to or greater than 30; and a secondary oxidation treatment step of performing a wet oxidation treatment under an oxidizing condition stronger than that of the primary oxidation treatment step.

Aggregate of carbon nanotubes, and production method therefor

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 an aggregate of carbon nanotubes satisfying (1) there is a 2&#x3b8; peak at 24&#xb0;&#xb1;2&#xb0; by X-ray powder diffraction analysis; (2) a height ratio (G/D ratio) of G band to D band by Raman spectroscopic analysis of wavelength 532 nm is 30 or more; and (3) a combustion peak temperature is from 550&#xb0; C. to 700&#xb0; C. The present invention provides an aggregate of carbon nanotubes excellent in dispersibility while high quality, giving a film, molded article, membrane or the like having excellent characteristics.

Aggregate of carbon nanotubes, dispersion thereof and conductive film using the same

An aggregate of carbon nanotubes satisfying all of the following requirements (1) to (3): (1) the volume resistivity is from 1&#xd7;10&#x3a9;&#xb7;cm to 5&#xd7;10&#x3a9;&#xb7;cm; (2) at least 50 out of 100 carbon nanotubes are double-walled carbon nanotubes in observation by a transmission electron microscope; and (3) the weight loss from 200&#xb0; C. to 400&#xb0; C. in thermogravimetry at a temperature rise of 10&#xb0; C/min is from 5% to 20%.

Carbon nanotube assembly and process for producing the same

Positive-working photosensitive resin precursor composition

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Nagoya, Japan

Naoyo Okamoto