METHOD FOR PRODUCING POLYACRYLONITRILE COPOLYMER, METHOD FOR PRODUCING CARBON FIBER PRECURSOR FIBER AND METHOD FOR PRODUCING CARBON FIBER

• Main Authors: YAMAGUCHI MASAHIRO, ITO KATSUHIRO, YASUI KENTA
• Format: Patent
• Language: English
• Published: 22.10.2012
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; ORGANIC MACROMOLECULAR COMPOUNDS; SPINNING; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a method for producing a polyacrylonitrile copolymer, suppressing the development of a covalent bond-based polyacrylonitrile high-order structure without impairing its productivity.SOLUTION: The method for producing a polyacrylonitrile copolymer, with two or more kinds of nitrile-based compounds including acrylonitrile as a polymerization feedstock, is provided, being characterized in that: the concentration of straight-chain unsaturated nitrile-based compounds other than acrylonitrile is 0.05 pt.mass or higher based on 100 pts.mass of the acrylonitrile.