| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a precursor for production of acrylic carbon fiber with properly evaluated density and voids. SOLUTION: The method for producing a precursor for production of acrylic carbon fiber comprises a wet spinning process using an aqueous solution of an inorganic salt as a solvent and spinning a stock solution comprising a polymer composed of≥95% by mass of acrylonitrile unit, in a coagulating bath with -5 to 10°C, washing with water, drying and drawing, wherein the precursor uses the coagulated threads with≤25 mg/g of absorbed dyestuff measured by soaking the coagulated thread in a solution of the acidity dyeability dye, Suminol Fast Blue R (molecular weight; 593) and absorbing the dye on the thread and then measuring absorbance of the dye solution. COPYRIGHT: (C)2007,JPO&INPIT
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