| abstract |
A polymerization process in aqueous emulsion of: n (I) one or more fluorinated monomers containing at least one ethylene unsaturation; n (II) one or more fluorinated monomers containing sulphonyl groups —SO 2 F; n said process comprising the use of a surfactant having the formula: n R f —X − M + n wherein n X is equal to —COO, —SO 3 ; n M is selected from H, NH 4 , alkaline metal; n R f represents a (per)fluoropolyether chain, preferably having number average molecular weight comprised between about 230 and about 1,800. |