| 摘要 |
PROBLEM TO BE SOLVED: To obtain an ethylene-hexafluoropropylene-based copolymer having necessary and enough amine resistance while keeping heat resistance, oil resistance, chemical resistance or the like similar to those of conventional fluororubber, suitable to a hose and a seal for automobile engine oil. SOLUTION: This ethylene-hexafluoropropylene-based copolymer comprises 35 to 60 mol% of ethylene structural unit, 25 to 50 mol% of hexafluoropropylene structural unit and 0 to 15 mol% of a structural unit derived from a monomer copolymerizable with these, having 60 wt.% or more fluorine content and 3,000 to 500,000 number average molecular weight.
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