Patent ID: 7560045

Claim:
A refrigerant composition comprising: a. a refrigerant consisting essentially of 1,1-difluoroethane; b. lubricant consisting of one or more propylene oxide homopolymers selected from the group consisting of polyalkylene glycols (PAG) having the formula Z-[(—CH 2 —CH(CH 3 )—O—) n —R] p where Z is the residue of a compound having 1-8 active hydrogens, n is a number having an average value which will give the PAG with a number average molecular weight range from about 1000 to about 4000, R is H or an alkyl group of 1 to 6 carbon atoms, and p is an integer having a value equal to the number of active hydrogens of Z; and c. a flame retardant selected from the group consisting of trifluorochloromethane, trifluoroiodomethane, phosphorous compounds, phosphate esters, hydrocarbons that contain iodine or bromine, hydrofluorocarbons that contain iodine or bromine, fluorocarbons that contain iodine or bromine, or any combination thereof; wherein the viscosity of the lubricant is between about 40 and 150 cSt at 40° C. and the lubricant is miscible in the refrigerant between about −40° C. and about 40° C.