Enhanced deposit control for lubricating oils used under...

C - Chemistry – Metallurgy – 10 – M

Patent

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C10M 159/18 (2006.01) C10M 129/10 (2006.01) C10M 129/50 (2006.01)

Patent

CA 2629559

Engine lubricating oils used under sustained high load conditions, such as high speed diesel or stationary natural gas engines, can have their deposit control properties enhanced by the addition to such engine oils of a minor amount of one or more neutral/low TBN or mixture of neutral/low TBN and overbased/high TBN alkali and alkaline earth metal salts of alkyl salicylates, or alkyl phenolate, a minor amount of one or more of an organo molybdenum complex in an amount sufficient to provide 25 wt. ppm to 2000 wt. ppm elemental molybdenum in the final lubricant composition.

L'invention concerne l'amélioration des propriétés anti-dépôt d'huiles lubrifiantes de moteur utilisées dans des conditions de charge élevée prolongées, telles que des moteurs diesel grande vitesse ou des moteurs au gaz naturel fixes. Ces améliorations reposent sur l'adjonction à ces huiles de moteur d'une faible quantité d'un ou plusieurs sels de métaux alcalins et alcalino-terreux à indice de basicité totale (TBN) neutre/faible, ou à indice de basicité neutre/faible et à indice de basicité hyperbasique/élevé en mélange, de salicylates d'alkyle ou de phénolate d'alkyle, et d'une faible quantité d'un ou plusieurs complexes organo-molybdène, en une quantité suffisante pour obtenir 25 à 2000 ppm (m/m) de molybdène élémentaire dans la composition lubrifiante finale.

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