Exxon Research and Engineering Company

Bp Corporation North America Inc.

Kim E Fyfe

Patrick E Godici

Jason Z Gao

Jeenok Theresa Kim

Manuel A Francisco

David G V Jones

Paul W Bessonette

John D Elnicki

Jeenok T Kim

The present invention relates to a lubricant composition exhibiting enhanced load-carrying capacity and oxidative/corrosion stability. The lubricant composition of the present invention comprises a major portion of an aliphatic ester base oil having lubrication properties and formed by the reaction of pentaerythritol and an organic carboxylic acid. The lubricant composition further comprises 3-(di-isobutoxy-thiophosphonylsulfanyl)-2-methyl-propionic acid (DITMPA) as an additive comprising from about 0.01 to about 0.40 weight percent of the fully formulated lubricating oil composition as well as yellow metal passivator comprising from about 0.01 to about 0.40 weight percent of the fully formulated lubricating oil composition. The enhanced load-carrying capacity and oxidative/corrosion stability of lubricant compositions containing DITMPA and yellow metal passivator is achieved without deleteriously affecting other salient properties of the lubricant.

Synergistic combination of load supplement additive and corrosion inhibitors for lubricant compositions

This invention generally relates to new polyol ester derivatives of polyamines for use as dispersant additives compatible in synthetic ester-based turbo oils. The dispersant additives of the present invention consist of a hydrocarbon acid, a polyol, an amine carrier such as diacid or cyclic anhydride and a polyamine. The hydrocarbon acid makes up the non-polar hydrocarbon portion of the dispersant and the polyamine functions as the polar headgroup. The diacid or cyclic anhydride provides a means for attaching the polar polyamine to the dispersant structure through an amide linkage. Different dispersant structures are obtained by varying the hydrocarbon acid, the polyol and the nature of the polyamine.

Polyol ester derivatives of polyamines and use in turbine oils to improve cleanliness

The use of oil soluble organo molybdenum compounds in combination with phenolic or amenic antioxidants has been found to improve the dispersancy retention capability of crankcase lubricants. Thus in one embodiment the present invention comprises improving dispersancy retention of a crankcase lubricant by including in the crankcase lubricant composition an oil soluble organomolybdenum compounds and at least one of a phenolic or aminic antioxidant. Particularly preferred organomlybdenum compounds are molybdenum dithiocarbamates while a mixture of a diarylamine and two phenolic antioxidants are preferred.

Lubricant formulations with dispersancy retention capability (law684)

A lubricating oil for improving the fuel economy of internal combustion engines is disclosed comprising a major amount of a lubricating oil base stock and a minor amount of an additive package which comprises in combination a molybdenum dithiocarbamate friction modifier, a mixture of calcium and magnesium salicylate and magnesium sulfonate detergent, and alkylated (alkoxy) amine. In addition the engine lubricant can include other typical engine oil lubricant additives including dispersants, anti-foaming agents, anti-oxidants, anti-wear additives, demulsifiers, etc.

High fuel economy passenger car engine oil

A lube oil composition that inhibits lubricant viscosity increase and dispersancy decrease is described. The composition includes an oil of lubricating viscosity and a mixture of specified functionalized derivatives of pentaerythritol tetrakis 3-mercaptopropionate and amine antioxidants.

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Sarnia, Canada

Kim E Fyfe