| abstract |
Provided is a fluoropolymer comprising a monomer (I) represented by general formula (I), wherein the content of a polymerization unit (I) based on the monomer (I) is 50 mol% or more with respect to all polymerization units constituting the fluoropolymer. General formula (I): CX2=CX–O–Rf–SO3 (In the formula, X independently represents F or CF3, Rf represents a C1-40 fluorine-containing alkylene group, or a C2-100 fluorine-containing alkylene group having an ether bond or a keto group. M represents –H, a metal atom, –NR7 4, an optionally substituted imidazolium, an optionally substituted pyridinium or an optionally substituted phosphonium; and R7 represents H or an organic group.) |