Patent ID: 7803284

Claim:
A method of using heat transfer fluids in the presence of metals and/or Lewis acids of mixtures, the method comprising the step of: adding a heat transfer fluid in the presence of metals and/or Lewis acids of mixtures, wherein the heat transfer fluid comprises: component (A) hydrofluoroethers and/or hydrofluoropolyethers, liquid under environmental conditions (25° C., 1 atm) having a number average molecular weight in the range 120-5,000; and component (B) a compound having a fluoropolyether structure comprising one or more repeating units selected from the group consisting of (CFXO), (CF 2 CF 2 O), (CF 2 CF 2 CF 2 O), (CF 2 CF 2 CF 2 CF 2 O), (CR 5 R 6 CF 2 CF 2 O), (CF(CF 3 )CF 2 O), and (CF 2 CF(CF 3 )O), wherein X=F, CF 3 ; R 5 and R 6 , equal to or different from each other, are selected from the group consisting of H, Cl, and perfluoroalkyl from 1 to 4 carbon atoms; and having end groups selected from the group consisting of pyridine, amine, aryl classes and having a number average molecular weight in the range 400-10,000.