Novel fluorinated copolymer with tridihydro fluorosulfonyl fluoride pendant groups and preparation thereof
Polymerization of fluorinated copolymers Patent #: 5281680
ApplicationNo. 392889 filed on 03/01/1995
US Classes:526/212, Alcohol contains a single hydroxy group or is alcoholate thereof526/243, Fluorine-containing monomer contains a sulfur atom526/245Fluorine containing monomer is a mono-carboxylic acid ester
ExaminersPrimary: Schofer, Joseph L.
Assistant: Sarofim, N.
Attorney, Agent or Firm
Foreign Patent References
International ClassC08F 012/30
Foreign Application Priority Data1993-10-12 JP
AbstractThe 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 μm or less in water:CF2 =CF--O--(CF2 CF(CF3)--O)n--(CF2)m--Z(1)wherein m is an integer of 2 to 4; Z is CO2 R (where R represents an alkyl group having 1 to 3 carbon atoms) or SO2 F; n is 1 or 2 when Z is CO2 R and n is an integer of 0 to 2 when Z is SO2 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):CF2 =CF2 (2).It also provides a perfluorocarbon copolymer containing functional groups obtained by this method.According to the production method of the present invention, a perfluorocarbon copolymer containing functional groups, which has good melt moldability and excellent performance, can be produced while the formation of a homopolymer of tetrafluoroethylene in the aqueous phase is inhibited.