Copolymer polyacrylonitrile precursor polyacrylonitrile-based fiber for carbon fiber, carbon fiber bundles, production process bundles fire resistant fibers and production process of carbon fiber bundles

摘要

A copolymer of polyacrylonitrile selected from (i) a copolymer comprising polyacrylonitrile an acrylonitrile unit in an amount of 93.0 mol% to 99.4 mol%; a unit based on (meth) acrylamide in an amount of 0.5 mol% to 4.0 mol%; and a unit hydroxyalkyl unsaturated carboxylate in an amount of 0.1 mol% to 3.0 mol%, the unit being based on (meth) acrylamide either or both of a unit (meth) acrylamide and a unit derived from (meth) acrylamide having a molecular weight of 105 or less; and (ii) a copolymer comprising polyacrylonitrile an acrylonitrile unit in an amount of 93.0 mol% to 98.7 mol%; a unit based on (meth) acrylamide in an amount of 1.0 mol% to 4.0 mol%; and a hydroxyalkyl carboxylate unit unsaturated in an amount of 0.3 mol% to 3.0 mol%, the unit being based on (meth) acrylamide either or both of a unit (meth) acrylamide and a derivative unit (meth) acrylamide having a molecular weight of 105 or less.