Ultra Low Phosphorus Lubricant Composition Incorporating Amine Tungstate

Abstract

A low-phosphorus lubricating composition having less than 600 ppm phosphorus, comprising at least 85 weight % of a lubricating base blend, and an additive comprising the following, as a weight % of the total composition:(1) an amine tungstate compound at an amount which provides about 0.1 to 1400 ppm W;(2) an alkylated diphenylamine at about 0.1-2%; and(3) a zinc dithiocarbamate at about 0.1-2%.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention concerns additive compositions and lubricating compositions for use in a low phosphorus environment, which provide improved resistance to lead and copper corrosion.[0003]2. Discussion of the Prior Art[0004]Government regulations over the last several decades have required Original Equipment Manufacturers (OEMs) to improve fuel economy and reduce pollution emissions for gasoline and diesel powered vehicles. It is common knowledge that OEMs and lubricant companies expect government to mandate even stricter fuel economy and emission requirements in the future. Many, if not all, of the vehicles now on the road contain pollution control devices to reduce pollution.[0005]Engine oils are formulated with antioxidants, friction modifiers, dispersants and antiwear additives to improve vehicle fuel economy, cleanliness and wear. Unfortunately, many of these additives contribute to the fouling of the pollution control...

AI Technical Summary

Benefits of technology

This patent describes a new lubricant that contains special additives to improve fuel economy, prevent corrosion and wear, and reduce emissions. The lubricant is designed to be used in existing gasoline or diesel engines, and can be combined with other additives to create a fully formulated engine oil. The key ingredients in the lubricant are a tungstate salt, an alkylated diphenylamine, and a dithiocarbamate. The lubricant is also free of molybdenum. The technical effect of this new lubricant is improved fuel economy, protection against corrosion and wear, and reduced emissions.

Problems solved by technology

Unfortunately, many of these additives contribute to the fouling of the pollution control devices.

When this occurs, vehicles emit high levels of pollution because of the failing performance of the pollution control devices.

It has been determined that high levels of phosphorus, sulfur and ash in gasoline and diesel engine oils can negatively affect the performance of pollution control devices.

However, it is also well known that high levels of molybdenum in engine oil can cause engine corrosion and wear.

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