A process for the preparation of perfluoropolyethers...

Details A process for the preparation of perfluoropolyethers... A process for the preparation of perfluoropolyethers...

C - Chemistry, Metallurgy

08

G

C08G 65/00 (2006.01) C08G 65/22 (2006.01) C08G 65/322 (2006.01)

Patent

CA 2435911

A process for the preparation of perfluoropolyethers of for- mula: T-CFX'-O-R f-CFX-COF (I) wherein: T = COF, F, C1-C3 perfluoroalkyl; X, X' = -F, -CF3; R f = -(C2F4O)m(CF2CF(CF3)O)n(CF2O)p(CF(CF3)O)q- , the sum n+m+p+q ranges from 2 to 200, by reduction with hydrogen of the corresponding peroxidic perfluoropolyethers, in the presence of a catalyst formed by metals of the VIII group supported on metal fluorides, at a temperture from 20°C to 140°C, and at a pressure between 1 and 50 atm.

Divulgation d'un procédé de préparation de perfluoropolyéthers de formule : T-CFX'-O-Rf-CFX-COF (I), dans laquelle T = COF, F ou un perfluoroalkyle en C1-C3, X, X' = -F, -CF3, Rf = -(C2F4O)m(CF2CF(CF3)O)n(CF2O)p(CF(CF3)O)q-, la somme n + m + p + q allant de 2 à 200. Ces perfluoropolyéthers sont obtenus par réduction avec de l'hydrogène des perfluoropolyéthers peroxydiques correspondants, en présence d'un catalyseur formés de métaux du groupe VIII sur un support en fluorures de métaux, à une température allant de 20 à 140 degrés C et à une pression allant de 1 à 50 atm.

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