Refrigeration oils comprising esters of hindered alcohols
AssigneeMobil Oil Corporation
InventorsSusan C. Ardito, Henry Ashjian, G. James Johnston
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Abstract
Improved refrigeration lubricants useful in compression refrigeration units are esters, exhibit an excellent balance of performance characteristics, notably in the combination of good miscibility, hydrolytic stablity, wear resistance coupled with a viscosity within the range required in many commercial refrigeration units. These esters are of a hindered dihydric or trihydric alcohol such as trimethylolpentanediol and a fatty acid, where at least 80 number percent of the acyl groups are straight chain groups.
Claims20
A composition suitable for use in a vapor compression refrigeration unit, the composition comprising a lubricant and a refrigerant comprising a hydrofluorocarbon;
- the lubricant comprising an ester of a hindered alcohol and at least one C.sub.4 -C.sub.18 fatty acid in which at least 70 numb percent of acyl groups from the fatty acid are straight chain acyl groups, wherein the hindered alcohol comprises at least one primary alcohol group and at least one secondary alcohol group, wherein no carbon atom that bears a hydroxy group is adjacent to either a methylene group or a methyl group, and wherein the lubricant has a 4 Ball Wear Volume (.mu.m.sup.3) of less than 1.
Dependencies are inferred from the claim text.