Patent ID: 8377998

Claim:
A process for producing a fluoropolymer, which comprises polymerizing a fluoromonomer having at least one fluorine atom and having a carboxylic acid type functional group selected from the group consisting of —COOH, —CN, —COF, —COOR 1 , —COOM and —COONR 2 R 3 in its molecule wherein R 1 is a C 1-10 alkyl group and each of R 2 and R 3 are independently H or a C 1-10 alkyl group and M is an alkali metal or a quaternary ammonium salt group and a fluoroolefin having at least one fluorine atom in its molecule using a hydrofluorocarbon as a medium, wherein the hydrofluorocarbon has 4 to 10 carbon atoms and has a ratio (molar basis) of the number of hydrogen atoms/the number of fluorine atoms of from 0.05 to 20 which has a continuous reaction step of successively adding the fluoromonomer having a carboxylic acid type functional group to the hydrofluorocarbon for reaction.