Lubricating Composition Containing Sulphur, Phosphorus and Ashfree Antiwear Agent and Amine Containing Friction Modifier

Abstract

The invention provides a lubricating composition containing an oil of lubricating viscosity, an amine-containing friction modifier, and an ashless antiwear agent. The lubricating composition is suitable for lubricating an internal combustion engine.

Description

FIELD OF INVENTION[0001]The invention provides a lubricating composition containing an oil of lubricating viscosity, an amine-containing friction modifier, and an ashless antiwear agent. The lubricating composition is suitable for lubricating an internal combustion engine.BACKGROUND OF THE INVENTION[0002]Engine manufacturers have focused on improving engine design in order to improve fuel economy and efficiency (typically, based on Federal Corporate Average Fuel Economy (CAFE) standards). Whilst improvements in engine design and operation have contributed, improved formulation of engine oil lubricant may also improve fuel economy and efficiency. Lubricants function to reduce and disperse engine deposits which accumulate when the engines are running. They also serve to reduce the friction between sliding moving parts (typically metallic or ceramic) that are in contact.[0003]It is well known for lubricating oils to contain a number of additives used to protect the mechanical devices s...

AI Technical Summary

Benefits of technology

[0029]In one embodiment the invention provides for the use of a lubricating composition as disclosed herein for providing at least one of (i) reducing or preventing phosphorus emissions, (ii) reducing or preventing sulphur emissions, (ii) wholly or partially replacing ZDDP in lubricating oils, (iii) improving fuel economy, (iv) fuel economy retention / efficiency, and (v) lead and copper corrosion resistance.

Problems solved by technology

ZDDP is also believed to have a detrimental impact on fuel economy and efficiency.

Both ZDDP and friction modifier function by adsorption on sliding surfaces, and each may interfere with each other's respective functions.

In addition, sulphur and phosphorus tend to poison the catalysts used in catalytic converters, resulting in a reduction in performance of said catalysts.

However, reducing the levels of antiwear additives such as ZDDP, is likely to increase wear and result in other detrimental performance of an engine.

Whilst the presence of ZDDP reduces wear, and reduced amounts of ZDDP reduce emissions, engines experience corrosion.

However, many known corrosion inhibitors interact with ZDDP resulting in increased wear and corrosion.

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