Method for producing fluorinated elastomer, aqueous dispersion, and solid composition

Abstract

To provide a method for producing a fluorinated elastomer, by which a fluorinated polymer excellent in water dispersion stability can be efficiently produced without using an emulsifier, while an aqueous medium with a small environmental impact is used. A method for producing a fluorinated elastomer, which comprises, in an aqueous dispersion that contains substantially no water-soluble emulsifier, and contains a first fluorinated polymer having TFE units and PAVE units and an aqueous medium, polymerizing a monomer containing TFE and PAVE to produce a second fluorinated polymer, wherein in the first fluorinated polymer, a content of the PAVE units is 20 to 95 mol % to a total content of the TFE units and the PAVE units, in the second fluorinated polymer, a content of the PAVE units is 20 to 95 mol % to a total content of the TFE units and the PAVE units, and before start of the polymerization of the monomer, a content of the first fluorinated polymer is 0.01 to 4.0 mass % to a total mass of the aqueous dispersion.

Dependencies are inferred from the claim text.