Carbon fibers and process for preparing same
AssigneeToray Industries, Inc.
InventorsMasanobu Kobayashi, Motoi Itoh, Yoji Matsuhisa, Kazuharu Shimizu
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Abstract
Carbon fibers with a surface oxygen concentration (O/C ratio) of 0.20 or less as measured by X-ray photoelectron spectroscopy, a surface concentration of hydroxyl groups (C--OH/C ratio) of 0.5% or greater as measured by chemical modification X-ray photoelectron spectroscopy and a surface concentration of carboxylic groups (COOH/C ratio) of 2.0% or less as measured by chemical modification X-ray photoelectron spectroscopy, and an aliphatic compound applied as a sizing agent which has multiple epoxy groups or an aromatic compound which has multiple epoxy groups, the number of atoms between the epoxy groups and an aromatic ring being 6 or greater.
Claims6
A carbon fiber comprising a surface oxygen concentration (O/C ratio) of 0.20-0.02 and a surface nitrogen concentration (N/C ratio) of 0.02-0.30, as measured by X-ray photoelectron spectroscopy, and comprising a sizing agent comprising an aliphatic polymer having multiple epoxy groups, said aliphatic compound including an atomic chain and said atomic chain containing 20-200 atoms.
Dependencies are inferred from the claim text.