Lubricants
AssigneeUnilever Patent Holdings B.V.
InventorsThomas F. Bunemann, Robertus W. Pierik
Life of this patent
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Abstract
A lubricant/working fluid composition for use in mechanical vapor compression type heat transfer devices is described wherein the working fluid is preferably tetrafluoroethane and the lubricant is an ester which is miscible with the working fluid at 10% over a temperature range of -50.degree. C. to +80.degree. C. and has a viscosity of 5 to 100 cSt at 40.degree. C. Useful esters include pentaerythritol partial ester of straight chain C.sub.5 or branched chain C.sub.7 carboxylic acids. The esters are compatible with non-chlorine containing working fluids and exhibit a low level of corrosion.
Claims9
A lubricant/working fluid composition for mechanical vapor compression type heat transfer devices wherein the working fluid is chlorine-free and the lubricant is an ester or an ester mixture consisting essentially of polyol esterified exclusively with carboxylic acid of at least 4 carbon atoms, and which comprises monocarboxylic acid selected from the group consisting of straight chain acids containing up to 5 carbon atoms and branched chain acids containing up to 8 carbon atoms in sufficient amount such that the ester or ester mixture is miscible with the working fluid at a level of 10% over a temperature range of -50.degree. C. to +80.degree. C. and has a viscosity of from 5 to 100 cSt measured at 40.degree. C.
Dependencies are inferred from the claim text.