Ultra low phosphorus lubricant composition

Abstract

A low-phosphorus lubrication 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, but is considered an organomolybdenum compound for the purposes of calculation of the amount present in the total composition.

Description

[0001]This application is a continuation of U.S. patent application Ser. No. 13 / 071,785, filed Mar. 25, 2011, which claims priority of U.S. Provisional Application No. 61 / 317,499, filed Mar. 25, 2010.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The 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.[0004]2. Discussion of the Prior Art[0005]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.[0006]Engine oil...

AI Technical Summary

Benefits of technology

[0011]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.

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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