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US 4,975,212 AGranted
Fluorinated lubricating compositions
AssigneeAllied-Signal Inc.
InventorsRaymond H. P. Thomas, David P. Wilson, David Nalewajek, Hang T. Pham
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AssigneeAllied-Signal Inc.
InventorsRaymond H. P. Thomas, David P. Wilson, David Nalewajek, Hang T. Pham
Estimating the term…
The present invention provides a novel lubricating composition comprising a polyoxyalkylene glycol having a cap of a fluorinated alkyl group on at least one end thereof. The composition has a molecular weight between 300 and 3,000, a viscosity of about 5 to about 150 centistokes at 37.degree. C., and a viscosity index of at least 20. The composition is miscible in combination with tetrafluoroethane in the range between -40.degree. C. and at least +20.degree. C. The novel lubricating composition is particularly useful with tetrafluoroethane in refrigeration and air-conditioning applications. As such, the present invention also provides a composition for use in refrigeration and air-conditioning comprising: (a) tetrafluoroethane; and (b) a sufficient amount to provide lubrication of at least one polyoxyalkylene glycol having a cap of fluorinated alkyl group on at least one end thereof. The lubricant has a molecular weight of about 300 to about 3,000, a viscosity of about 5 to about 150 centistokes at 37.degree. C., and a viscosity index of at least 20. The lubricant is miscible in combination with the tetrafluoroethane in the range between about -40.degree. C. and at least about +20.degree. C.
A lubricating composition comprising a polyoxyalkylene glycol having a cap of a fluorinated alkyl group on at least one end thereof wherein said polyoxyalkylene glycol is formed from copolymer of ethylene oxide and propylene oxide, copolymer of ethylene oxide and butylene oxide, or copolymer of propylene oxide and butylene oxide and said composition has a molecular weight between 300 and 3,000, a viscosity of about 5 to about 150 centistokes at 37.degree. C., and a viscosity index of at least 20, and is miscible in combination with tetrafluoroethane in the range between -40.degree. C. and at least +20.degree. C.
A composition for use in refrigeration and air-conditioning comprising:
A method for improving lubrication in refrigeration and air-conditioning equipment using tetrafluoroethane as a refrigerant comprising the step of:
A composition for us in refrigeration and air-conditioning comprising:
Dependencies are inferred from the claim text.