| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject precursor that gives carbon fiber of excellent tensile strength by applying a silicone-containing finishing oil of a specific surface tension thereto. SOLUTION: The objective precursor is obtained by applying a silicone finishing oil comprising (A) an epoxy modified silicone that has a surface tension of <=24 dyne/cm, preferably a contact angle of <=15 deg. to polyacrylonitrile film at 25 deg.C, particle sizes of <=0.2μm, the ratio of the emulsifier R1 of <=40% to the non-volatile component, a viscosity of >=1,000 CST at 25 deg.C and is modified with epoxy groups in an amount of 0.05-10 wt.% and (B) an amino-modified silicone that has a viscosity of >=1,000 CST at 25 deg.C and is modified with amino groups in an amount of 0.05-10 wt.%.
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