Ultra Low Phosphorus Lubricant Compositions

Abstract

A low-phosphorus lubricating composition has less than 600 ppm phosphorus, comprising at least 85 weight % of a lubricating base blend, and an additive comprising the following, as weight % of the total composition:(1) an organomolybdenum compound at an amount which provides about 0.1-800 ppm Mo;(2) a hindered phenol at about 0.1-2%; and(3) a dithiocarbamate at about 0.1-2%; with a first proviso that where the dithiocarbamate does not comprise a metal dithiocarbamate, the additive additionally comprises:(4) an alkylated diphenylamine at about 0.1-2%, and with a second proviso that where the organomolybdenum compound comprises molybdenum dithiocarbamate, it is considered a metal dithiocarbamate for purposes of the first proviso[G1], but is considered an organomolybdenum compound for the purposes of calculation of the amount present in the total composition.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe invention concerns additive compositions and lubricating compositions for use in a low phosphorus environment, which provide excellent phosphorus retention and improved resistance to lead and copper corrosion.2. Discussion of the Prior ArtGovernment 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.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 co...

AI Technical Summary

Benefits of technology

A novel lubricant composition has been discovered that contains friction modifiers, antiwear additives, antioxidants and corrosion inhibitors with a high molybedenum and low phosphorus content that offers excellent fuel economy while maintaining good corrosion and wear protection and significantly reduced level of phosphorus volatility. The novel lubricant composition contains 600 ppm or less of phosphorus and 800 ppm or less of molybedenum. It can be used as a top treat to existing fully formulated gasoline or diesel engine oils or combined with one or more dispersants, detergents, VI improvers, base oils and any other additive(s) needed to make fully formulated engine oil.

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.

Not only is the level of phosphorus in engine oil important for the proper performance of pollution control devices but also phosphorus volatility.

Phosphorous volatility can have a significant negative impact on the performance of pollution control devices.

Unfortunately, the antiwear additives used in engine oils to protect the engine contain sulfur and phosphorus.

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

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