Mitsubishi Chemical Corporation

Naomasa Matsuyama

Takayuki Kobayashi

Atsushi Nakajima

Kenichi Watanabe

Manabu Kaneko

Katsuhiko Ikeda

Takuya Teranishi

Masahiro Ichino

Norifumi Hirota

Naoki Aoyama

Kiharu Numata

Yoshiko Irie

Masahiro Hata

Yasuyuki Fujii

Takayuki Kiriyama

Takeshi Nii

Kouki Wakabayashi

Hiroyuki Nakao

Yuusuke Shinmen

Teppei Miura

Akiyoshi Kogame

Kenji Kaneta

Akito Hatayama

Harumi Matsuda

Kenji Hirano

Akihiro Itou

Yusuke Shinmen

Shouhei Mori

Shigekazu Takeda

Yuutarou Nakamura

Hiroko Matsumura

Tadashi Ootani

Toshiyuki Itou

A first aspect of the present invention is carbon fiber wherein the surface of a monofilament has a center line average roughness Ra of 6.0 nm or more and 13 nm or less, and the monofilament has a long diameter/short diameter ratio of 1.11 or more and 1.245 or less. A second aspect of the present invention is carbon fiber precursor acrylic fiber wherein the surface of a monofilament has a center line average roughness Ra of 18 nm or more and 27 nm or less, and the monofilament has a long diameter/short diameter ratio of 1.11 or more and 1.245 or less. The carbon fiber according to the first aspect is obtained by stabilizing and carbonizing under specific conditions the carbon fiber precursor acrylic fiber according to the second aspect.

Carbon fiber precursor acrylic fiber, carbon fiber, and method for producing same

Provided are: a polyacrylonitrile-based precursor fiber for the production of a carbon fiber having a large single-fiber fineness, said precursor fiber ensuring high heat stability of a spinning dope and excellent productivity; and a copolymer suitable for the production of said precursor fiber. Also provided are: high-quality carbon fiber bundles which have a large single-fiber fineness and excellent productivity; a process for producing the same; and a process for producing flameproofed fiber bundles suitable for the production of the carbon fiber bundles. A polyacrylonitrile-based copolymer which comprises 93.0 to 99.4 mol % of acrylonitrile units, 0.5 to 4.0 mol % of (meth)acrylamide-based units, and 0.1 to 3.0 mol % of unsaturated carboxylic acid hydroxyalkyl ester units and in which the (meth)acrylamide-based units are (meth)acrylamide units and/or (meth)acrylamide derivative units having a molecular weight of 105 or less; a precursor fiber comprising the copolymer; a process for producing flameproofed fiber bundles which uses precursor fiber bundles consisting of the precursor fiber; carbon fiber bundles; and a process for production thereof.

Polyacrylonitrile-based copolymer, polyacrylonitrile-based precursor fiber for carbon fiber, carbon fiber bundles, process for producing stabilized fiber bundles, and process for producing carbon fiber bundles

Growing community of inventors

Hiroshima, Japan

Naomasa Matsuyama