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Title:
CARBON FIBER AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2019/244830
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a carbon fiber for a carbon fiber reinforced composite material which is not easily damaged during a molding process and exhibits an excellent elastic modulus. The carbon fiber has a strand elastic modulus of at least 360 GPa, a strand strength of at least 3.5 GPa, and a single fiber diameter of at least 6.0 µm, and satisfies one or more of the requirements below. (A) When one end is a fixed end and the other end is a free end that can rotate about the axis of a fiber bundle, the remaining twist number is at least 2 turns/m. (B) The total fineness, which is the product of the single fiber fineness (g/km) as a carbon fiber and the number of filaments (counts), is at least 740 g/km. In addition, the single fiber elastic modulus Es (Gpa) and the loop breaking load A (N) of the carbon fiber satisfy the relationship of expression (1). (1): A≥-0.0017×Es+1.02. Furthermore, the single fiber diameter of the carbon fiber is at least 6.0 µm, the relationship between the strand elastic modulus E (GPa) of the carbon fiber and the knot strength B (MPa) of the carbon fiber as evaluated at a heating loss rate of 0.15% or less at 450°C satisfies expression (2), and the twist number of the carbon fiber is 20-80 turns/m. (2): B≥6.7×109×E-2.85

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Inventors:
OKUDA HARUKI (JP)
WATANABE JUN (JP)
MATSUMOTO NAOHIRO (JP)
TANAKA FUMIHIKO (JP)
Application Number:
PCT/JP2019/023851
Publication Date:
December 26, 2019
Filing Date:
June 17, 2019
Export Citation:
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Assignee:
TORAY INDUSTRIES (JP)
International Classes:
D01F9/22; D01F6/18
Domestic Patent References:
WO2010084856A12010-07-29
WO2008047745A12008-04-24
WO2008063886A22008-05-29
WO2013157613A12013-10-24
WO2013157612A12013-10-24
Foreign References:
JP2002327374A2002-11-15
JPS51105419A1976-09-18
JPH11269727A1999-10-05
JP2009256833A2009-11-05
JP2001049536A2001-02-20
JPH10195718A1998-07-28
JP2000160436A2000-06-13
JPS47026964A
JPS5691015A1981-07-23
JP2002001725A2002-01-08
JP2014141761A2014-08-07
Other References:
See also references of EP 3808880A4
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