Patent ID: 8598290

Claim:
A method of producing a fluoroelastomer comprising an emulsion polymerization of a fluorinated monomer in the presence of a water-soluble radical polymerization initiator, wherein the emulsion polymerization is carried out in the presence of a compound (1) containing a functional group reactive in radical polymerization and a hydrophilic group and a fluorinated compound (2) containing a fluorocarbon group comprising 1 to 6continuously united carbon atoms with fluorine atom directly bound to each of them as well as a hydrophilic group, the compound (1) is a perfluoroallyl ether compounds represented by formula (1e): CX 2 2 ═CFCF 2 —O—(CF(CF 3 )CF 2 O) n5 —CF(CF 3 )—Y 1 (1e) wherein the two atoms of X 2 are the same and each represents F or H, n 5 represents an integer 0 or 1 to 10 and Y 1 represents —SO 3 M 1 or —COOM 1 , the compound (2) is a perfluoroalkyl compounds represented by the formula (2b): CF 3 —(CF 2 ) n7 —Y 5 (2b) wherein n 7 represents an integer of 1 to 5 and Y 5 represents —SO 3 M 3 or —COOM 3 ; M 3 represents H, NH 4 or an alkali metal, the fluoroelastomer is vinylidene fluoride/hexafluoropropylene copolymer, vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymer or vinylidene fluoride/tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, and the water-soluble radical polymerization initiator is water-soluble inorganic compound or water-soluble organic compound peroxides.