Lubricating compositions with enhanced deposit performance

Abstract

A lubricant composition includes a lubricating base oil, a controlled release friction modifier, a dispersant, a viscosity modifier and a cleanliness booster. The controlled release friction modifier is an ashless, dispersant-stabilized, borated controlled release friction modifier including an ionic tetrahedral borate compound including a cation and a tetrahedral borate anion, wherein the tetrahedral borate anion includes a boron atom having two bidentate di-oxo ligands of C18 tartrimide.

Description

[0001]This nonprovisional application claims priority to U.S. Provisional Application No. 62 / 535,527, which was filed on Jul. 21, 2017, and is herein incorporated by reference.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to a lubricant composition, in particular, a lubricant composition, suitable for use in, for example, internal combustion engines, which reduces deposit formation and friction in an engine.Description of the Background Art[0003]Engine oils are formulated for the purpose of reducing friction in the engine, engine cleanliness (e.g., deposit control), control of wear, corrosion and rust in the engine. To accomplish this goal, engine oils contain numerous and various additives including friction modifiers, detergents, dispersants, viscosity modifiers and antioxidants.[0004]Of significant concern is the reduction of friction in engines so as to improve fuel economy necessitating the use of lower viscosity lubricating base stocks wh...

AI Technical Summary

Benefits of technology

The present invention is a lubricating oil composition that improves fuel economy by adding a friction modifier called CRFM, which results in better overall fuel economy and reduces deposit formation. The composition also includes additives that work together to prevent deposits from the CRFM. This composition meets the performance specifications required for the VW TDi2 and provides improved fuel economy while maintaining other performance specifications.

Problems solved by technology

Because there are many requirements, the chemistry used to formulate engine oils is complex.

Often a particular additive that can improve one aspect of a lubricant's performance works against the performance enabled by other additives.

Such oils are highly non-polar and, as a result, have a limited amount of solubility for polar additives.

Additionally, the use of highly paraffinic base oils can increase the amount of unwanted deposit formation.

Specifically, most fuel economy additives, including the friction modifiers detailed above, are highly polar and, as such, are challenged to remain soluble in the lubricating oil.

With limited solubility and availability of the additives, improvements in fuel economy are similarly limited.

In addition, many of the additives degrade or are consumed in service with the result that fuel economy is more difficult to maintain for extended times. Additionally, conventional friction modifiers typically cause increased deposit formation as they have limited solubility and are rapidly oxidized in-service.

These documents, however, do not describe compositions that have been formulated to provide increased fuel economy while also reducing deposit formation and friction in an engine.

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