Process for preparing perfluoropolyethers

Details Process for preparing perfluoropolyethers Process for preparing perfluoropolyethers

2007-05-08

2007-05-08

Keys, Rosalynd (Department: 1621)

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

Organic compounds

Oxygen containing

C568S621000

Reexamination Certificate

active

10953764

ABSTRACT:
A process to obtain perfluoropolyethers comprising:a) synthesis of peroxidic perfluoropolyethers by one of the following reactions:al) TFE photooxidation, in solvents selected between perfluorocarbons and (mono)hydrofluorocarbons, of general formula:in-line-formulae description="In-line Formulae" end="lead"?CyF(2y+2−X)Hx  (II)in-line-formulae description="In-line Formulae" end="tail"? wherein y is an integer from 2 to 4; x is an integer equal to 0 or 1; in the present of fluorine diluted with an inert gas; ora2) TFE oxidation using as radical initiator fluorine or hypofluorites of formulain-line-formulae description="In-line Formulae" end="lead"?RfOF  (III)in-line-formulae description="In-line Formulae" end="tail"? (Rfperfluoroalkyl radical from 1 to 3 carbon atoms), operating from −40° C. to −100° C. at a pressure comprised between 0 and 12 bar;b) thermal treatment of the product obtained in a) at a temperature from 1500° C. to 250° C.;c) treatment with elemental fluorine of the polymer obtained in step b) at temperatures from 100° C. to 250° C., or by treatment with fluorine in the presence of UV radiations, operating at temperatures from −50° C. to 120° C.

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