Patent ID: 6841088

Claim:
A refrigerant composition comprising: (a) at least one fluorocarbon; (b) at least one oxygenated lubricant selected from the group consisting of polyol esters, polyalkylene glycols and polyvinyl ethers; (c) at least one non-oxygenated lubricant selected from the group consisting of paraffins, napthenes, aromatics and poly-α-olefins; and (d) at least one compatibilizer comprising at least one lactone selected from the group represented by formulas I, II, and III: wherein, R 1 through R 8 are independently selected from hydrogen, linear, branched, cyclic, bicyclic, saturated and unsaturated hydrocarbyl radicals; the carbon to ester functional group carbonyl oxygen ratio is from about 7 to about 15; and the molecular weight is from about 100 to about 300 atomic mass units.