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AssigneeHydro-Quebec
InventorsBruno Michel Ameduri, Michel Armand, Mario Boucher, Abdellatif Manseri
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The present invention describes the synthesis of new fluorinated elastomers with very low glass transition temperatures (Tg), a good resistance to bases, gasoline and other carburants and good workability properties, these elastomers contain hexafluoropropene (HFP), perfluoro(4-methyl-3,6-dioxaoct-7-ene) sulfonyl fluoride (PFSO2F), vinylidene fluoride (VDF) and/or at least one fluorinated alkene and/or one vinyl perfluorinated ether. In a precise case, they are prepared by radical polymerisation of HFP and PFSO2F or by radical terpolymerisation HFP, PFSO2F and VDF in the presence of different organic initiator, such as peroxides, peresters or diazo compounds.
A fluorinated sulfonated elastomer, not containing tetrahydrofluoroethylene or monomers containing siloxane groups, and having a glass transition temperature (Tg) between −36 and −50° C., and comprising a hexafluoropropene (HFP) copolymer, and a perfluorosulfonyl ethoxy propyl vinyl ether fluoride (PSEPVE) or perfluoro(4-methyl-3,6-dioxaoct-7-ene) sulfonyl fluoride (PFSO2F).
A process for the preparation of fluorinated elastomers by copolymerisation of hexafluoropropene with perfluorosulfonyl ethoxy propyl vinyl ether fluoride (PSEPVE) or perfluoro (4-methyl-3,6-dioxaoct-7-ene) sulfonyl fluoride (PFSO2F), characterised in that the preparation is conducted through a radical copolymerisation in the presence of one organic initiator at a temperature between 20 and 200° C., for a period of time between 3 and 6 hours, and at an initial pressure between 2 and 100 bars, and allowing the said initial pressure to fall progressively as the monomers are consumed.
Dependencies are inferred from the claim text.