Lubricant composition containing mixed friction modifiers

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 141/06 (2006.01) C10M 129/76 (2006.01) C10M 133/08 (2006.01) C10M 137/02 (2006.01) C10M 155/04 (2006.01) C10M 163/00 (2006.01)

Patent

CA 2131098

The present invention provides an improved lubricating oil composition for automotive internal combustion engines and transmission which comprises an oil of lubricating viscosity having admixed therewith a minor amount of friction modifier composition which reduces the coefficient of friction between moving mechanical parts, thereby providing for enhanced fuel economy. The friction modifier composition comprises a combination of an alkoxylated hydrocarbyl amine and a polyol partial ester of a saturated or unsaturated fatty acid or mixture of such esters, each preferably present in the range of from about 0.1 to about 1.0 % by weight based on the weight of the oil. This combination of components provides for synergistic fuel economy effects particularly when used as components in automotive crankcase lubricants also containing conventional additive packages, which effects are not observed in oil which contains one or the other of these components alone.

Composition d'huile lubrifiante améliorée destinée à des systèmes de transmission et des moteurs thermiques d'automobiles, constituée d'une huile possédant une viscosité permettant la lubrification, dans laquelle on a ajouté et mélangé une faible quantité d'une composition d'agents modifiant le frottement qui réduit le coefficient de frottement entre des en pièces mécaniques en mouvement et produit une économie de carburant plus importante. La composition d'agents modifiant le frottement comprend un mélange d'une amine hydrocarbyle alcoxylée et d'un ester partiel de polyol d'un acide gras saturé ou non saturé ou un mélange de ces esters, chacun de ces éléments étant préférablement présent dans une proportion comprise entre environ 0,1 et environ 1,0 % en poids sur la base du poids de l'huile. Cette association de constituants produit plus particulièrement des effets synergiques sur l'économie de carburant lorsqu'on les utilise comme composants dans des lubrifiants de carters-moteurs d'automobiles contenant également des additifs classiques; ces effets n'apparaissant pas avec de l'huile ne renfermant qu'un seul de ces composants.

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