Fluorinated unsaturated compound and polymers obtainable therefrom

1. A compound of formula CF 2 ═CFCF 2 OSF 5 .

2. Process for the preparation of the compound of claim 1 comprising reacting SOF 4 with CF 2 ═CFCF 2 OSO 2 F in the presence of a fluoride catalyst.

3. A polymer comprising recurring units derived from CF 2 ═CFCF 2 OSF 5 .

4. Polymer according to claim 3 further comprising recurring units derived from at least one ethylenically unsaturated monomer.

5. Polymer according to claim 4 wherein the ethylenically unsaturated monomer is selected from a fluorinated monomer and/or a non-fluorinated monomer.

6. Polymer according to claim 5 wherein the fluorinated monomer is selected from the group consisting of: C 2 -C 8 fluorofluoroolefins; C 2 -C 8 hydrogenated fluoroolefins; fluoroalkylethylenes of formula CH 2 ═CH—R m , wherein R f0 is a C 1 -C 6 fluoroalkyl or a C 1 -C 6 fluorooxyalkyl having one or more ether groups; chloro- and/or bromo- and/or iodo-C 2 -C 6 fluoroolefins; fluoroalkylvinylethers of formula CF 2 ═CFOR f1 in which R f1 is a C 1 -C 6 fluoroalkyl; hydrofluoroalkylvinylethers of formula CH 2 ═CFOR f1 in which R f1 is a C 1 -C 6 fluoroalkyl; fluorooxyalkylvinylethers of formula CF 2 ═CFOR O1 , in which R O1 is a C 1 -C 12 alkyl or a C 1 -C 12 fluoroalkyl having one or more ether groups; fluoroalkyl-difluoromethoxy-vinylethers of formula CF 2 ═CFOCF 2 OR f2 in which R f2 is a C 1 -C 6 fluoroalkyl or a C 1 -C 6 fluoroalkyloxyl having one or more ether groups; functional fluoro-alkylvinylethers of formula CF 2 ═CFOY 0 , in which Y 0 is a C 1 -C 12 alkyl or fluoroalkyl, or a C 1 -C 12 alkyloxy, or a C 1 -C 12 fluoroalkyloxyl, said Y 0 group having one or more ether groups and Y 0 comprising a carboxylic or sulfonic acid group, in its acid, acid halide or salt form; and fluorodioxoles of formula:

wherein each of R f3 , R f4 , R f5 , R f6 , equal or different each other, is independently a fluorine atom, a C 1 -C 6 fluoro- or (halo)fluoroalkyl, optionally comprising one or more oxygen atom.

7. Polymer according to claim 5 wherein the non-fluorinated monomer is selected from the group consisting of: C 2 -C 8 olefins; C 2 -C 8 chloroolefins; acrylic- or methacrylic monomers of formula CH 2 =CR h1 R h2 in which R h1 is chosen from hydrogen and the methyl group and R h2 is the —CO—R h3 group in which R h3 is chosen from the —OH group and the —O—R h4 groups with R h4 chosen from the linear or branched alkyl groups containing from 2 to 18 carbon atoms optionally bearing one or more —OH group.

8. Polymer according to claim 4 wherein the ethylenically unsaturated monomer is a fluorinated monomer selected from tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, and fluoroalkylvinylethers of formula CF 2 ═CFOR f1 wherein R f1 is —CF 3 , —C 2 F 5 , or —C 3 F 7 .

9. Polymer according to claim 4 , wherein the polymer comprises recurring units derived from CF 2 ═CFCF 2 OSF 5 and recurring units derived from tetrafluoroethylene.

10. Polymer according to claim 9 , wherein the polymer further comprises recurring units derived from hexafluoropropylene.

11. Polymer according to claim 4 , wherein the polymer comprises recurring units derived from CF 2 ═CFCF 2 OSF 5 and recurring units derived from vinylidene fluoride.

12. Polymer according to claim 11 , wherein the polymer further comprises recurring units derived from hexafluoropropylene.

13. Polymer according to claim 3 , wherein the amount of recurring units derived from CF 2 ═CFCF 2 OSF 5 ranges from 0.1 to 99.9 mole %.

14. Process for the preparation of a polymer of claim 3 comprising the step of polymerizing the compound of formula CF 2 ═CFCF 2 OSF 5 and optionally at least one ethylenically unsaturated monomer in the presence of a polymerization initiator.

15. Process according to claim 14 wherein the polymerization initiator is a radical polymerization initiator.

16. An article comprising the polymer of claim 3 .