Process for the preparation of perfluoropolyethers...

Details Process for the preparation of perfluoropolyethers... Process for the preparation of perfluoropolyethers...

2005-07-19

2005-07-19

Keys, Rosalynd (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic halides

C562S850000, C562S858000

Reexamination Certificate

active

06919479

ABSTRACT:
A process for the preparation of perfluoropolyethers of formula:in-line-formulae description="In-line Formulae" end="lead"?T-CFX′—O—Rf—CFX—COF  (I)in-line-formulae description="In-line Formulae" end="tail"?wherein:T=COF, F, C1-C3perfluoroalkyl;X, X′=—F, —CF3;Rf=—(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.

REFERENCES:
patent: 3847978 (1974-11-01), Mensi et al.
patent: 4755330 (1988-07-01), Viola et al.
patent: 4788257 (1988-11-01), Caporiccio et al.
patent: 5164517 (1992-11-01), Marchionni et al.
patent: 0 349 115 (1990-01-01), None
patent: 0 571 809 A2 (1992-12-01), None
patent: WO 98/37043 (1998-08-01), None

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