| 摘要 |
PROBLEM TO BE SOLVED: To provide a suitable method for producing a high-performance acrylonitrile-based fiber as a carbon fiber precursor, in high productivity and in high degree of freedom of its composition design. SOLUTION: The method for producing the acrylonitrile-based fiber as a carbon fiber precursor comprises blending (A) a carboxyl-free acrylonitrile-based polymer with (B) a carboxyl-containing acrylonitrile-based polymer followed by spinning the blend. In this method, it is preferable that the polymer B contain 0.014-100 mass% of carboxyl-containing monomer units and the mass ratio B/A be 0.0001-2.3. COPYRIGHT: (C)2009,JPO&INPIT
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