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US 12,630,780 B2Granted
Lubricants for use in vapor-compression systems
AssigneeThe Lubrizol Corporation
InventorsDavid M. Pallister, Eric Schweim, Scott Miller, Kyle Stevens, Arthur L. Backman
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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.
Claims17
A lubricant composition comprising:
- a. an oil of lubricating viscosity having an ISO viscosity grade of 220 at 40° C. and comprising:
- (i) at least two polyalphaolefins (“PAO”), or (ii) at least one polyalphaolefin (“PAO”) and an alkylated naphthalene (“AN”), wherein at least one PAO of (i) or (ii) is a PAO oil having a neat viscosity of 134 cSt at 100° C., and
- b. 2.5 to 10 wt % of a viscosity modifier that is a hydrocarbon polymer that is polyisobutylene and having a number average molecular weight (Mn) of 1000 to 2500 Daltons (Da), based on a total weight of the lubricant composition;
- wherein the lubricant composition further comprises 1 to 6 wt % solubilized ammonia and/or an amine-based refrigerant therein.
1 more element
Dependencies are inferred from the claim text.