Lubricants for use in vapor-compression systems
AssigneeThe Lubrizol Corporation
InventorsDavid M. Pallister, Eric Schweim, Scott Miller, Kyle Stevens, Arthur L. Backman
Life of this patent
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Abstract
Lubricant compositions comprising an oil of lubricating viscosity and a viscosity modifier that is a hydrocarbon polymer having a number average molecular weight (Mn) of less than 10,000 Daltons (Da). The viscosity modifier is present at greater than 2 wt %, based on a total weight of the lubricant composition. Exemplary hydrocarbon polymers include, but are not limited to, olefin polymers, such as polyisobutylene polybutene, ethylene α-olefin copolymers, or combinations thereof.
Claims25
A lubricant composition comprising:
- a. an oil of lubricating viscosity comprising at least one (i) polyalphaolefin (“PAO”), (ii) mineral oil, such as hydrotreated and severely hydrotreated mineral oils;
- (iii) gas-to-liquid (“GTL”) hydrocarbon oils, such as saturated isoparaffinic oils, (iv) alkylated naphthalene (“AN”), (v) alkylated benzenes, or (vi) combinations thereof, and
- b. great than 2 wt % of viscosity modifier that is hydrocarbon polymer having a number average molecular weight (Mn) of less than 10,000 Daltons (Da), based on a total weight of the lubricant composition;
- wherein the lubricant composition further comprises solubilized ammonia and/or an amine-based refrigerant therein.
(canceled)
A method of increasing the elastohydrodynamic (“EHD”) film thickness of a lubricant composition, the method comprising adding a viscosity modifier to a lubricant composition, based on a total weight percent of the lubricant composition, wherein:
- a. the lubricant composition comprises an oil of lubricating viscosity comprising at least one (i) polyalphaolefin (“PAO”), (ii) mineral oil, such as hydrotreated and severely hydrotreated mineral oils;
- (iii) gas-to-liquid (“GTL”) hydrocarbon oils, such as saturated isoparaffinic oils (iv) alkylated naphthalene (“AN”), (v) alkylated benzenes, or (vi) combinations thereof;
- and
- b. the viscosity modifier is a hydrocarbon polymer having a number average molecular weight (Mn) of less than 10,000 Daltons (Da);
- wherein the lubricant composition further comprises solubilized ammonia and/or an amine-based refrigerant therein.
25-26. (canceled)
Dependencies are inferred from the claim text.