POLYMERIZATION PROCESS OF SULPHONIC MONOMERS

摘要

31 A polymerization process in aqueous emulsion of: (I) one or more fluorinated monomers containing at least one ethylene unsaturation; (II) one or more fluorinated monomers containing sulphonyl groups -SO2F; said process comprising the use of a surfactant having the formula: R~- X-M' wherein X is equal to -COO, -S03; M is selected from H, NH4, alkaline metal; - R~ represents a (per)fluoropolyether chain, preferably having number average molecular weight comprised between about 230 and about 1,800.