| 摘要 |
A sizing agent for carbon fibers comprises a water-based dispersion of a mixture of constituents A, B, C and D to be described below at weight ratios of (constituent A)/(constituents B+C)=60/40 to 90/10, (constituent B/constituent C)=2/1 to 7/1, and (constituents A+B+C)/(constituent D)=85/15 to 97/3 where the constituent A is phenyl epoxy resin or aromatic nitrogen-containing epoxy resin, the constituent B is shown by the following expression (I): <IMAGE> (I) where X is a benzene residue or a diphenyl residue, n is an integer in the range of 1 to 5, Y is <IMAGE> where q is an integer in the range of 4 to 50, p is 0 or an integer in the range of 1 to 5, l and m are such that 1/2</=m/l</=1/4, the constituent C is polyolyethylene alkylphenylether shown by the following expression (II): <IMAGE> (II) where R is an alkyl group with 8 to 9 carbon atoms and a is an integer in the range of 4 to 8, and the constituent D is aliphatic monovalent alcohol ester of oleic acid and/or monovalent aliphatic acid ester of oleyl alcohol.
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