| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a fluorine-containing copolymer, whose melt viscosity is suitable for a molding material and whose molecular weight distribution is well controlled to assure the dimensional consistency of molded products, by enabling the solution copolymerization of tetrafluoroethylene and a fluorine-containing vinyl ether in the presence of a hydrofluorocarbon-based inactive solvent and a chain transfer agent. SOLUTION: A fluorine-containing copolymer is manufactured by a method wherein tetrafluoroethylene and a fluorine-containing vinyl ether, described by the formula: CF2=CFOCH2(CF2)nX, wherein X is a hydrogen atom or a halogen atom and n is an integer of 1 or larger, are allowed to react upon each other in a copolymerization reaction for the manufacture of a fluorine- containing copolymer, with CF3CHFCHFCF2CF3 acting as reaction solvent in the presence of a chain transfer agent occupying 0.5-4 mol percent of the whole amount of monomers injected. It is preferred that copolymerization will proceed at a reaction temperature of 15-35 deg.C.
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