| 摘要 |
Perfluoropolyether carboxylic acid fluoride having the following general formula: <?in-line-formulae description="In-line Formulae" end="lead"?>F(CF2CF2CF2O)nCF2CF2COF<?in-line-formulae description="In-line Formulae" end="tail"?> (n: 2-200, preferably 35-70) can be produced by starting fluorination reaction of polyfluoropolyether carboxylic acid having the general formula as a tetrafluorooxetane polymer: <?in-line-formulae description="In-line Formulae" end="lead"?>F(CH2CF2CF2O)nCH3CF2COF<?in-line-formulae description="In-line Formulae" end="tail"?> (n: 2-200) in a dispersed state in a perfluoropolyether-based solvent with a fluorine gas at 50° -80° C. , then slowly elevating the fluorination reaction temperature, and finally completing the fluorination reaction at 100°-120° C., where even in the case of fluorination reaction of the starting material with a high degree of polymerization the desired product can be produced in high yield, while suppressing the decomposition and keeping the high degree of polymerization substantially.
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