Polymerization process of sulphonic monomers
AssigneeAusimont S.p.A.
InventorsMarco Apostolo, Vincenzo Arcella
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Abstract
A polymerization process in microemulsion 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: a) preparation of an aqueous microemulsion, having a pH in the range 4-7, of perfluoropolyethers (PFPEs); b) feeding of the microemulsion to the polymerization reactor, in an amount higher than 18 ml per liter of reaction medium; c) introduction of the monomer (II) in liquid form into the reactor, reactor pressurization with the gaseous monomers (I); d) addition of the initiator, and feeding of the monomers (I) during the polymerization so as to maintain constant the reactor pressure.
Claims9
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 —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.
Dependencies are inferred from the claim text.