To readily obtain the subject polymer in high yield by subjecting a sulfonic acid type functional group-containing perfluorocarbon monomer to solution polymerization with a perfluoroolefin by using hydrofluoro ether as a medium.
(A) A sulfonic acid type functional group-containing perfluorocarbon monomer [preferably CF2=CFOCF2CF(CF3)OCF2CF2SO2F] is subjected to solution polymerization with (B) perfluoroolefin (preferably tetrafluoroethylene) in (C) a hydrofluoroether medium of the formula CnH2n+1-O- CmF2m+1 [(n) is 1 or 2; (m) is an integer of 2-8] to provide the objective perfluorocarbon polymer. The component C preferably includes C4F9OCH3, CF3CF2CF2OCH3, etc. The polymer obtained thus is preferably used especially as ion exchange film. This method reduces fear of the ozonosphere disruption and global warming.
Eto, Satoo
Saito, Mitsugi
