Lubrificant composition comprising a dispersant, a...

C - Chemistry – Metallurgy – 10 – M

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C10M 163/00 (2006.01) C10M 129/10 (2006.01) C10M 129/76 (2006.01) C10M 133/12 (2006.01) C10M 135/26 (2006.01) C10M 159/18 (2006.01) C10M 169/04 (2006.01)

Patent

CA 2398075

This invention relates to a diesel engine lubricant composition comprising a base stock, a dispersant and an antioxidant comprising an oil soluble trinuclear organomolybdenum compound of the generic formula (I): Mo3Sx-(Q), wherein x is from 4 to 10 and Q is a core group, which may be a ligand, and at least one other compound selected from a phenolic and an aminic compound. The composition is capable of controlling the viscosity of the lubricant in the presence of soot and to retain the dispersancy of the dispersant. The compositions of the present invention minimise wear in engines and undesirable emission from exhaust caused by incomplete combustion from vehicles which use diesel engines and lubricants therefor. The combination of antioxidants perform better at controlling soot induced viscosity increase than the individual compounds.

L'invention concerne une composition de lubrifiant de moteur diesel qui comprend une huile de base, un dispersant et un antioxydant renfermant un composé d'organomolybdène trinucléaire soluble dans l'huile de formule générale (I): Mo¿3?S¿x?-(Q). Dans ladite formule, x vaut de 4 à 10 et Q est un groupe central, qui peut être un ligand. Il existe au moins un autre composé pouvant être un composé phénolique ou aminofonctionnel. La composition peut contrôler la viscosité du lubrifiant en présence de suie et conserver le pouvoir dispersant du dispersant. Elle permet de réduire au minimum l'usure dans les moteurs et les émissions non souhaitées dans les gaz d'échappement, qui résultent d'une combustion incomplète des gaz de véhicules diesel utilisant les lubrifiants correspondants. La combinaison d'antioxydants est plus performante que les composés individuels pour le contrôle de l'augmentation de la viscosité induite par la suie.

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