Abstract: A dispersion composition comprising 100 parts by weight of a specific perfluorocarbon-based copolymer containing functional groups and 10 to 10,000 parts by weight of a specific liquid fluoro-oligomer(s). The composition of the present invention is useful as a material for producing, for example, a fluorine-containing cation-exchange membrane having excellent functions imparted thereto.

Abstract: An ion exchange fluorocarbon resin precursor composition obtained by removing liquid components from a mixed solution of a dispersion of an ion exchange fluorocarbon resin precursor and a dispersion of tetrafluoroethylene polymer (PTFE).

Abstract: A dispersion composition comprising 100 parts by weight of a specific perfluorocarbon-based copolymer containing functional groups and 10 to 10,000 parts by weight of a specific liquid fluoro-oligomer(s). The composition of the present invention is useful as a material for producing, for example, a fluorine-containing cation-exchange membrane having excellent functions imparted thereto.

Abstract: An ion exchange fluorocarbon resin precursor composition obtained by removing liquid components from a mixed solution of a dispersion of an ion exchange fluorocarbon resin precursor and a dispersion of tetrafluoroethylene polymer (PTFE).

Abstract: The present invention provides a method for producing a perfluorocarbon copolymer containing functional groups, which comprises:emulsifying a perfluorocarbon monomer containing a functional group represented by the following general formula (1) into fine dispersions having an average diameter of 2 .mu.m or less in water:CF.sub.2 .dbd.CF--O--(CF.sub.2 CF(CF.sub.3)--O)n--(CF.sub.2)m--Z(1)wherein m is an integer of 2 to 4; Z is CO.sub.2 R (where R represents an alkyl group having 1 to 3 carbon atoms) or SO.sub.2 F; n is 1 or 2 when Z is CO.sub.2 R and n is an integer of 0 to 2 when Z is SO.sub.2 F,adding at least one water-soluble organic chain transfer agent selected from the group consisting of aliphatic alcohols having 1 to 6 carbon atoms and ethers having 2 to 6 carbon atoms andpolymerizing the perfluorocarbon monomer (1) containing a functional group with tetrafluoroethylene represented by the following formula (2):CF.sub.2 .dbd.CF.sub.2 (2).