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US 8,772,210 B2Granted
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.
Claims18
A grease with favorable frictional properties, comprising
- a) a first base stock comprising a PAO with a viscosity of about 150 cSt KV 100° C. and a viscosity index over 100;
- b) a second base stock with a viscosity of about 50 cSt KV 100° C. less than the viscosity of the first base stock, the second base stock is a PAO, and
- c) a polyurea thickener,
- d) an additive package comprising a combination of friction reducers, antiwear additives, extreme pressure additives and rust inhibitors at about 6.8 weight percent of the grease,
- wherein the first base stock comprises about 83 weight percent of the total base stock, the second base stock comprises about 17 weight percent of the total base stock, the total base stock comprises about 74 weight percent of the grease and the polyurea thickener comprises about 19.1 weight percent of the grease, and
- wherein the coefficient of friction of the grease as measured by the Optimol SRV test is less than or equal to 0.067 over a load range of from 50 to 600 Newtons.
3 more elements
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 of about 150 cSt KV 100° C. and a viscosity index over 100, a second base stock with a viscosity of about 50 cSt KV 100° C. less than the viscosity of the first base stock, the second base stock is a PAO, an additive package comprising a combination of friction reducers, antiwear additives, extreme pressure additive and rust inhibitors at 6.8 weight percent of the grease, and a polyurea thickener and
- b) lubricating with the grease,
- wherein the first base stock comprises about 83 weight percent of the total base stock, the second base stock comprises about 17 weight percent of the total base stock, the total base stock comprises about 74 weight percent of the grease and the polyurea thickener comprises about 19.1 weight percent of the grease, and
- wherein the coefficient of friction of the grease as measured by the Optimol SRV test is less than or equal to 0.067 over a load range of from 50 to 600 Newtons.
1 more element
A method of formulating a grease with favorable frictional properties, comprising
- a) obtaining a first base stock comprising a PAO with a viscosity of about 150 cST KV 100° C. and a viscosity index over 100, a second base stock with a viscosity about 50 cSt KV 100° C. less than the viscosity of the first base stock, the second base stock is a PAO, an additive package comprising a combination of friction reducers, antiwear additives, extreme pressure additives and rust inhibitors at about 6.8 weight percent of the grease, and a polyurea thickener and
- b) formulating the first base stock, the second base stock, and the thickener to form a grease with favorable frictional properties,
- wherein the first base stock comprises about 83 weight percent of the total base stock, the second base stock comprises about 17 weight percent of the total base stock, the total base stock comprises about 74 weight percent of the grease and the polyurea thickener comprises about 19.1 weight percent of the grease, and
- wherein the coefficient of friction of the grease as measured by the Optimol SRV test is less than or equal to 0.067 over a load range of from 50 to 600 Newtons.
1 more element
Dependencies are inferred from the claim text.