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US 9,315,711 B2Granted
Heat transfer fluids and corrosion inhibitor formulations for use thereof
AssigneePrestone Products Corporation
InventorsBo Yang, Aleksei Gershun, Peter M. Woyciesjes
Life of this patent
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Abstract
Disclosed herein is a heat transfer fluid concentrate comprising: greater than or equal to 85 weight percent of a freezing point depressant, based on the total weight of the heat transfer fluid concentrate; 50 to 2000 ppm of lithium ions; an azole compound; an inorganic phosphate; a carboxylic acid; and an acrylate based polymer, wherein the heat transfer fluid has a pH of 7.0-9.5. The heat transfer fluid concentrate can be used to make a heat transfer fluid.
Claims22
A heat transfer fluid comprising
- a) a freezing point depressant;
- b) 25 to 1600 ppm lithium ions;
- and
- c) a carboxylate;
- wherein the heat transfer fluid has a pH of 7 to 9.5 and is free of lithium molybdate, silicate, borate and amines.
2 more elements
Dependencies are inferred from the claim text.