Acrylonitrile type copolymer, the production method, acrylonitrile type copolymer solution and polyacrylonitrile precusor fiber and its production method for carbon fiber

摘要

When it melts in amide solvent even, the solution (the spinning undiluted solution) we are superior in thermal stability, we offer the production method of the polyacrylonitrile precusor fiber for the carbon fiber which uses the acrylonitrile type copolymer solution, and the aforementioned acrylonitrile type copolymer solution which melt acrylonitrile type copolymer and the aforementioned acrylonitrile type copolymer whose it is possible to obtain the fine polyacrylonitrile fiber which is suited for the production of the carbon fiber in amide solvent. Content of the sulfuric acid basis which above 1.0 10-5 equivalent /g contains the sulfonate group which is derived from the polymerization initiator, (is derived from the polymerization initiator/combination weighing of the aforementioned sulfonate group and the aforementioned sulfuric acid basis) value (equivalence ratio) the acrylonitrile type copolymer which is 0.4 or less. The acrylonitrile type copolymer solution which includes the aforementioned acrylonitrile type copolymer and the amide solvent.