Perfluoroelastomers having a low glass transition...

Details Perfluoroelastomers having a low glass transition... Perfluoroelastomers having a low glass transition...

C - Chemistry, Metallurgy

08

F

C08F 214/26 (2006.01) C08F 14/26 (2006.01) C08F 214/18 (2006.01) C08F 214/24 (2006.01)

Patent

CA 2437037

A method of making a curable fluoroelastomer is disclosed. The method comprises the steps of preemulsifying at least one perfluorovinylether in water, and copolymerizing the preemulsified perfluorovinylether with a gaseous fluorinated monomer in the presence of a cure site monomer. The method provides a fluoroelastomer having a glass transition temperature of less than - 10~C. Also disclosed is a fluoroelastomer that consists essentially of a perfluorovinylether of formula (I) as defined below, a cure site component, perfluoromethylvinylether, and tetrafluoroethylene and/or chlorotrifluoroethylene.

L'invention concerne un procédé de production d'un élastomère fluoré durcissable. Ce procédé consiste à pré-émulsionner au moins un perfluorovinyléther dans de l'eau, puis à copolymériser ce perfluorovinyléther pré-émulsionné avec un monomère fluoré gazeux en présence d'un monomère à site de durcissement. Ce procédé permet d'obtenir un élastomère fluoré présentant une température de transition vitreuse inférieure à -10 ·C. L'invention concerne également un élastomère fluoré comprenant essentiellement un perfluorovinyléther de formule (I), telle que définie dans la description, un composant à site de durcissement, du perfluorométhylvinyléther et du tétrafluoroéthylène et/ou du chlorotrifluoroéthylène.

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