| 摘要 |
PROBLEM TO BE SOLVED: To provide a perfluoroelastomer having excellent low-temperature characteristics and heat and chemical resistances. SOLUTION: A fluorine-containing copolymer comprises a repeating unit (a) derived from tetrafluoroethylene, a repeating unit (b) derived from perfluoro(methyl vinyl ether) and a repeating unit (c) derived from perfluoro(propyl vinyl ether) in (40-70)/(3-57)/(3-57) (molar ratio) of (a)/(b)/(c) äe.g. 51.2/43.7/5.1 (molar ratio) of (a)/(b)/(c)}. COPYRIGHT: (C)2006,JPO&NCIPI
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