| 摘要 |
PURPOSE:To produce the titled fiber having high elastic modulus, and useful as a tire cord, etc., by spinning a solution of an acrylonitrile polymer having a specific intrinsic viscosity, washing with water, subjecting to the primary drawing under wet heat condition, drying the product, carrying out the secondary drawing under heating with steam and post-drawing under dry heat condition. CONSTITUTION:A solution of an acrylonitrile polymer composed mainly of acrylonitrile and having an intrinsic viscosity of >=2.0 is used as the spinning dope, and is extruded to obtain a coagulated fiber. The fiber is washed with water, or subjected to the primary drawing under wet heat condition to a draw ratio of 2-10 simultaneous to the washing with water. The product is dried, subjected to the secondary drawing under heating with steam at an effective draw ratio of >=12, and then to the post-drawing under dry heat condition and a drawing tension of >=1.0g/d at a draw ratio of >=1.05 to obtain the objective fiber having an effective draw ratio of >=13.
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