Patent ID: 6555639
Filing Date: 2003-04-29
Classification: C08F

Abstract:
A process for polymerizing(I) one or more fluorinated monomers containing at least one ethylene unsaturation; (II) one or more fluorinated monomers containing sulphonyl groups â€”SO2F; said process comprising the following steps: a) preparing a perfluoropolyether (PFPE) aqueous microemulsion with a pH in a range between 4 and 7, having end groups selected from groups of non reactive groups and groups with one or more H, Cl atoms to replace fluorine; b) feeding into a reactor an amount of said microemulsion greater than 18 ml per liter of reaction medium; c) degassing the reactor, feeding into the reactor said monomer (II) as a liquid, taking up reactor pressure by feeding into the reactor gaseous monomers (I); d) adding an initiator and, during the polymerization, feeding into the reactor said monomers (I) to maintain reactor pressure.