Composition containing fluorine-containing polymer and aprotic solvent, fluorine-containing polymer, method for producing fluorine-containing polymer solution, method for producing mixture of fluorine monomer and aprotic solvent, and method for producing fluorine-containing polymer

A fluorine-containing polymer (A),

• the fluorine-containing polymer (A) comprising fluoride ions in an amount of 0.01 to 100 ppm by mass, and
• the fluorine-containing polymer (A) comprising, as a main component, a structural unit represented by formula (A1):
• wherein R1 represents a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group,
• a structural unit represented by formula (A2):
• wherein R2 to R5 each independently represent a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group, or
• a structural unit represented by formula (A3):
• wherein R6 to R9 each independently represent a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group.

A method for producing a fluorine-containing polymer (A) solution in which a fluorine-containing polymer (A) produced by a polymerization reaction is dissolved in an aprotic solvent (B),

• the method comprising a polymerization step of polymerizing a monomer (M) in a mixture of the monomer (M) and the aprotic solvent (B);
• the solution comprising fluoride ions in an amount of 0.01 to 500 ppm by mass;
• the mixture comprising fluoride ions in an amount of 0.05 to 300 ppm by mass;
• the monomer (M) comprising a compound represented by formula (M1):
• wherein R1 represents a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group,
• a compound represented by formula (M2):
• wherein R2 to R5 each independently represent a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group, or
• a compound represented by formula (M3):
• wherein R6 to R9 each independently represent a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group;
• the fluorine-containing polymer (A) comprising, as a main component, a structural unit represented b formula (A1):
• wherein R1 represents a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group,
• a structural unit represented by formula (A2):
• wherein R2 to R5 each independently represent a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group, or
• a structural unit represented by formula (A3):
• wherein R6 to R9 each independently represent a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group;
• and
• the aprotic solvent (B) being at least one solvent selected from the group consisting of a perfluoroaromatic compound, a perfluorotrialkylamine, a perfluoroalkane, a hydrofluorocarbon, a fluorocyclic ether, a hydrofluoroether, and an olefin compound containing at least one chlorine atom.

A method for producing a mixture of a fluorine-containing polymer (A) and an aprotic solvent (B),

• the method comprising mixing the fluorine-containing polymer (A) and the aprotic solvent (B),
• the mixture comprising fluoride ions in an amount of 0.01 to 500 ppm by mass,
• the fluorine-containing polymer (A) comprising, as a main component, a structural unit represented by formula (A1):
• wherein R1 represents a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group,
• a structural unit represented by formula (A2):
• wherein R2 to R5 each independently represent a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group, or
• a structural unit represented by formula (A3):
• wherein R6 to R9 each independently represent a fluorine atom, a C1-C5 perfluoroalkyl group, or a C1-C5 perfluoroalkoxy group, and
• the aprotic solvent (B) being at least one solvent selected from the group consisting of a perfluoroaromatic compound, a perfluorotrialkylamine, a perfluoroalkane, a hydrofluorocarbon, a fluorocyclic ether, a hydrofluoroether, and an olefin compound containing at least one chlorine atom.