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US 2013/0210690 A1Published application
Tartaric Acid Derivatives in HTHS Fluids
AssigneeThe Lubrizol Corporation
InventorMark C. Davies
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Abstract
The present invention provides high-HTHS value lubricating compositions that have improved fuel economy performance. The present invention also provides methods of operating an internal combustion engine utilizing such compositions. The lubricating compositions of the invention utilize butane dioic imide compounds, such as tartrimides, and may also be low sulfur, low ash and low phosphorus, providing lower wear and friction and improved fuel economy.
Claims15
A lubricant composition comprising
- (a) an oil of lubricating viscosity;
- (b) an alkoxy or hydroxy substituted butane dioic imide friction modifier wherein the friction modifier is represented by formula I;
- wherein R1 is hydrocarbyl group containing from 8 to 30 carbon atoms;
- R2 is —H or a hydrocarbyl group;
- Y is —H, —OH or —OR2 with the proviso that when Y is —OR2 the two R2 groups may be linked to form a ring.
2 more elements
A method of lubricating an engine comprising the steps of:
- I. supplying to the engine a lubricant composition comprising:
- (a) an oil of lubricating viscosity;
- (b) an alkoxy or hydroxy substituted butane dioic imide friction modifier wherein the friction modifier is represented by formula I;
- wherein R1 is hydrocarbyl group containing from 8 to 24 carbon atoms;
- R2 is a hydrocarbyl group;
- Y is —H, —OH or —OR2 with the proviso that when Y is —OR2 the two R2 groups may be linked to form a ring.
3 more elements
Dependencies are inferred from the claim text.