| 摘要 |
PROBLEM TO BE SOLVED: To provide a carbon fiber bundle having excellent sizing performance and excellent physical property as composite material under hygroscopic environment. SOLUTION: The invention relates to the carbon fiber bundle on which a sizing agent comprising benzoxazine compound represented by formula (1) is attached. In the formula R<SB>1</SB>is an alkyl group, a cyclohexyl group, a phenyl group or a phenyl group substituted with an alkyl or alkoxyl group. COPYRIGHT: (C)2007,JPO&INPIT
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