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US 7,759,532 B2Granted
Refrigerant additive compositions containing perfluoropolyethers
AssigneeE.I. du Pont de Nemours and Company
InventorsThomas J. Leck, Thomas Frank Saturno, Gregory A. Bell
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Abstract
The present invention relates to compositions and processes of using perfluoropolyether to maintain or improve the oil return, lubrication, cooling capacity, or energy efficiency of a refrigeration, air conditioning or heat transfer system.
Claims13
A composition comprising:
- a) a refrigerant or heat transfer fluid comprising 2,3,3,3-tetrafluoro-1-propene (CH2═CFCF3);
- and
- b) at least one perfluoropolyether, wherein said perfluoropolyether has two end groups;
- wherein each of the two end groups of the perfluoropolyether, independently, is either an unfunctionalized, branched or straight chain perfluoroalkyl radical, or a functionalized group selected from the group consisting of esters, hydroxyls, amines, amides, cyanos, carboxylic acids and sulfonic acids;
- and
- wherein the amount of said perfluoropolyether is less than 1% by weight relative to said refrigerant or heat transfer fluid.
3 more elements
Dependencies are inferred from the claim text.