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Acrylonitrile-based precursor fiber for carbon fiber and method for production thereof

  • US 6,428,891 B1
  • Filed: 01/22/2001
  • Issued: 08/06/2002
  • Est. Priority Date: 07/22/1998
  • Status: Expired due to Term
First Claim
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1. An acrylonitrile-based precursor fiber of an acrylonitrile-based copolymer containing 96.0 to 98.5% by weight of acrylonitrile units, said acrylonitrile-based precursor fiber having a tensile strength of not less than 7.0 cN/dtex, an elastic modulus in tension of not less than 130 cN/dtex, an iodine adsorption of not greater than 0.5% by weight based on the weight of the fiber, a degree of crystal orientation (π

  • ) of not less than 90% as determined by wide-angle X-ray analysis, and, when made into a tow, a degree of variation in tow fineness of not greater than 1.0%.

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