Title:
CARBON FIBER AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2019/172246
Kind Code:
A1
Abstract:
The present invention addresses the problem of obtaining a carbon fiber that shows high dispersibility in a molding process for producing a carbon fiber-reinforced composite material and in a molded article obtained as a final product. The carbon fiber according to the present invention is a carbon fiber having a single fiber length of 10 cm or less wherein, when single fibers thereof are observed within a scope of a linear distance of 1 mm from the side surface thereof, the fluctuation width of the fiber axis is 2.5 μm or more and the coefficient of variation of the fluctuation width is not greater than 100%. This carbon fiber is manufactured by a method which comprises subjecting a polyacrylonitrile-based carbon fiber precursor fiber bundle successively to flame proofing, preliminary carbonization and carbonization treatments in this order and then cutting the thus obtained carbon fiber bundle in the form of a continuous fiber, wherein, in the carbonization treatment, the number of twists of the fiber bundle is adjusted to 16 turns/m or greater or the twist angle on the fiber bundle surface is adjusted to 2.0° or greater.
Inventors:
OKUDA HARUKI (JP)
TANAKA FUMIHIKO (JP)
TANAKA FUMIHIKO (JP)
Application Number:
PCT/JP2019/008615
Publication Date:
September 12, 2019
Filing Date:
March 05, 2019
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
D01F9/22
Domestic Patent References:
| WO2014196432A1 | 2014-12-11 |
Foreign References:
| JPS51105419A | 1976-09-18 | |||
| JP2014141761A | 2014-08-07 | |||
| JPH08507336A | 1996-08-06 | |||
| JP2001279537A | 2001-10-10 | |||
| JP2015067910A | 2015-04-13 | |||
| JPS5887321A | 1983-05-25 | |||
| JP2014141761A | 2014-08-07 | |||
| JP2006070153A | 2006-03-16 | |||
| JP2008509298W | ||||
| JP2002001725A | 2002-01-08 |
Other References:
See also references of EP 3763856A4
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