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US 2009/0247441 A1Published application
High viscosity index pao with polyurea thickeners in grease compositions
AssigneeExxonMobil Research and Engineering Company
InventorMark W. Baum
Life of this patent
Estimating the term…
Abstract
The invention relates to grease compositions containing high viscosity index polyalphaolefins (HVI-PAO) and polyurea thickeners. The use of HVI-PAOs and polyurea thickeners in a bi-modal base stock grease application provides favorable frictional properties and improved overall performance.
Claims22
A grease with favorable frictional properties, comprising
- a) a first base stock comprising a PAO with a viscosity over 100 cSt KV 100° C. and a viscosity index over 100;
- b) a second base stock with a viscosity at least 25 cSt KV 100° C. less than the viscosity of the first base stock, the second base stock selected from the group consisting of Group II, Group III, PAO, GTL and any combination thereof.
- c) a polyurea thickener comprising at least 5 weight percent of the grease and less than 25 weight percent of the grease.
A method of improving frictional properties, comprising
- a) obtaining a grease with favorable frictional properties comprising a first base stock comprising a PAO with a viscosity over 100 cSt KV 100° C. and a viscosity index over 100, a second base stock with a viscosity at least 25 cSt KV 100° C. less than the viscosity of the first base stock, the second base stock selected from the group consisting of Group II, Group III, PAO, GTL and any combination thereof, a polyurea thickener comprising at least 5 weight of the grease and less than 25 weight percent of the grease and
- b) lubricating with the grease.
A method of formulating a grease with favorable frictional properties, comprising
- a) obtaining a first base stock comprising a PAO with a viscosity over 100 cSt KV 100° C. and a viscosity index over 100, a second base stock with a viscosity at least 25 cSt KV 100° C. less than the viscosity of the first base stock, the second base stock selected from the group consisting of Group II, Group III, PAO, GTL and any combination thereof, a polyurea thickener comprising at least 5 weight of the grease and less than 25 weight percent of the grease and
- b) formulating the first base stock, the second base stock, and the thickener to form a grease with favorable frictional properties.
Dependencies are inferred from the claim text.