Patent ID: 7091294

Claim:
A fluoropolymer (A) having units derived from monomer units formed by cyclopolymerization of (I) at least one fluorinated diene selected from the group consisting of a fluorinated diene represented by the formula (1) and a fluorinated diene represented by the formula (2), and (II) units derived from monomer units formed by cyclopolymerization of a fluorinated diene represented by the formula (3): CF 2 ═CFCF 2 —C(CF 3 )(OR 1 )—CH 2 CH═CH 2 (1) CF 2 ═CFCH 2 —CH((CH 2 ) n C(CF 3 ) 2 (OR 1 ))—CH 2 CH═CH 2 (2) CF 2 ═CFCH 2 —CH(COOR 2 )—CH 2 CH═CH 2 (3) wherein R 1 represents a hydrogen atom, a blocked group of a hydroxyl group capable of being converted into a hydrogen atom by an acid, or a blocked carboxyl group-containing organic group capable of being converted into a carboxyl group-containing organic group by an acid, R 2 represents a hydrocarbon group having at most 20 carbon atoms, and n represents 0 or 1.