Patent ID: 6374629
Filing Date: 2002-04-23
Classification: C09K,C10M,C10N,F25B

Abstract:
A lubricant-refrigerant composition contained within a compression refrigeration system, wherein said compression refrigeration system comprises a compressor, condenser, evaporator, expansion valve, oil return valve, and oil return line; and said lubricant-refrigerant composition comprises;(A) at least one fluorine-containing hydrocarbon refrigerant containing 1 or 2 carbon atoms, further wherein fluorine is the only halogen in said fluorine-containing hydrocarbon; and (B) at least one lubricant comprising (1) a hydrocarbyl substituted arene, (2) a phosphate ester, (3) an organic ester of a carboxylic acid and an alcohol, (4) a perfluoropolyethylene, (5) an ether of the structure â€ƒwherein R3 is a hydrocarbon group containing from 1 to 20 carbon atoms, R4 is independently hydrogen, methyl or ethyl, R5 is hydrogen or an aliphatic group, b is an integer of from 1 to 10 and a, when aâ‰ 0, is an integer such that the product of a and b is at least two; (6) a polyether wherein the polyether is prepared by polymerizing an ether of the structure CH2&boxH;CH(R1)nOâ€”R2 â€ƒwherein R1 is a methylene group, n is 0, 1 or 2 and R2 is an aliphatic group containing from 1 to 4 carbon atoms, or (7) a polyalphaolefin; â€ƒwherein at a temperature of above âˆ’60Â° C. that a phase separation occurs such that at least two phases are formed, said phases being a refrigerant rich phase and a lubricant rich phase, further wherein the lubricant rich phase resides below the refrigerant rich phase.