Patent ID: 7232932
Filing Date: 2007-06-19
Classification: C10M,C10N

Abstract:
1. A process for producing a perfluoropolyether having the formula in which each r is independently 3 to 6; if r=3, both end groups C r F (2r+l) are perfluoropropyl radicals; A can be O—(CF(CF 3 )CF 2 —O) w , O—(CF 2 —O) x (CF 2 CF 2 —O) y , O—(C 2 F 4 —O) x , O—(C 2 F 4 —O) x (C 3 F 6 —O) y , O—(CF(CF 3 )CF 2 —O) x (CF 2 —O) y , O(CF 2 CF 2 CF 2 O) w , O—(CF(CF 3 )CF 2 —O) x (CF 2 CF 2 —O) y—(CF 2 —O) z , or combinations of two or more thereof; w is 4 to 100; x, y, and z are each independently 1 to 100 comprising (1) contacting a reactant with a metal halide to produce an alkoxide wherein said reactant is selected from the group consisting of a perfluoro acid halide, a C 2 to C 4 -substituted ethyl epoxide, a C 3+ fluoroketone, and combinations or two or more thereof; (2) contacting said alkoxide with hexafluoropropylene oxide or tetrafluorooxetane to produce a second acid halide; (3) esterifying said second acid halide to an ester; (4) reducing said ester to its corresponding alcohol; (5) converting said corresponding alcohol with a base to a salt; (6) contacting said salt with a C 3+ olefin or perfluoroalkene to produce a fluoropolyether; and (7) fluorinating said fluoropolyether.