POLYACRYLONITRILE-BASED POLYMER, CARBON FIBER PRECURSOR FIBER, AND METHOD FOR PRODUCING CARBON FIBER

摘要

PROBLEM TO BE SOLVED: To provide a polyacrylonitrile-based polymer required for producing carbon fiber precursor fibers with high productivity, which have a catalytic metal uniformly dispersed therein at a high concentration and are capable of causing a catalyst graphitization reaction.SOLUTION: The polyacrylonitrile-based polymer comprises: a polyacrylonitrile-based polymer A which contains acrylonitrile (a) and a salt (b) of an organic acid having a group VIII metal and a vinyl group as copolymerization components; and a polyacrylonitrile-based polymer B which contains acrylonitrile (a) as a copolymerization component and does not contain the salt (b) of the organic acid having a group VIII metal and a vinyl group as a copolymerization component.