| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing fluorine-containing copolymer that can stabilize the thermally unstable chain terminal structure and enables the polymer to be melt formed at a forming temperature of lower than 320°C, preferably lower than 300°C and more preferably lower than 280°C. SOLUTION: An amorphous fluorine-including copolymer having substantially perfluoro structure is subjected to the fluorination treatment with fluorine gas under the temperature condition, at 0 to 50°C, preferably in this range and higher than the glass transition point Tg of the copolymer to produce the fluorination-treated, fluorine-containing copolymer. Thereby the produced fluorinated fluorine-containing copolymer is thermally stabilized at the part of thermally unstable chain-terminal structure and the existence ratio of the unstable chain terminal is decreased less than 0.20, preferably less than 0.10 and the melt formation can be carried out at a relatively low temperature as stated above. COPYRIGHT: (C)2007,JPO&INPIT
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