| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing carbon fiber precursor fibers by which carbon fibers having good strength can be obtained by feeding an acrylonitrile-based polymer solution with little gel to spinning without being accompanied with deterioration in productivity and a cost increase, achieving stable spinning operation efficiency and subsequently carrying out flameproofing and carbonizing treatment. SOLUTION: The method for producing the carbon fiber precursor fibers includes spinning the acrylonitrile-based polymer solution obtained by copolymerizing 0.01-2 mol% of at least one kind of carboxy group-containing vinylic compound. Furthermore, the method for producing the carbon fiber precursor fibers includes adding at least one kind of compound selected from the group comprising ammonia, an amine compound and a quaternary ammonium salt to a part between a storage tank of the polymer solution and a spinneret and then spinning the acrylonitrile-based polymer solution. COPYRIGHT: (C)2009,JPO&INPIT
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