Polymerization process of sulphonic monomers

C - Chemistry – Metallurgy – 08 – F

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C08F 216/12 (2006.01) C08F 214/18 (2006.01) C08F 216/14 (2006.01)

Patent

CA 2351858

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 polymeriza- tion reactor, in an amount higher than 18 ml per litre 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.

Procédé de polymérisation en microémulsion de : (I) au moins un monomère fluoré comptant au moins une insaturation éthylénique; (II) au moins un monomère fluoré comportant un groupement sulfonyle -SO2F. Le procédé en question comprend les étapes suivantes : a) préparation d'une microémulsion aqueuse de perfluoropolyéthers (PFPE) dont le pH se situe entre 4 et 7; b) acheminement de la microémulsion dans un réacteur de polymérisation, pour obtenir une concentration supérieure à 18 ml par litre de milieu réactionnel; c) introduction du monomère (II) sous forme liquide dans le réacteur, et pressurisation du réacteur à l'aide des monomères gazeux (I); d) addition de l'initiateur et alimentation en monomères (I) pendant la polymérisation, de manière à maintenir une pression constante dans le réacteur.

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