Lubricating compositions

Details Lubricating compositions Lubricating compositions

C - Chemistry, Metallurgy

10

M

C10M 141/10 (2006.01) C10M 163/00 (2006.01)

Patent

CA 2288812

A lubricating oil composition comprises a major amount of an oil of lubricating viscosity and a minor amount of an additive combination comprising an ashless dispersant having a polymeric hydrocarbon backbone of <o>M</o>n between 1000 and 4000 and a dialkyl phosphorodithioic acid metal salt, in which of the alkyl groups, at least 70 mole % are secondary having 6 carbon atoms, no more than 15 mole % are primary, and no more than 15 mole % are secondary having less than 6 carbon atoms.

Composition d'huile lubrifiante contenant une quantité principale d'une huile à viscosité lubrifiante et une quantité mineure d'une combinaison d'additifs composée d'un dispersant sans cendres possédant un squelette d'hydrocarbure polymère de <o>M</o>n entre 1000 et 4000 et d'un sel métallique d'acide dialkyle-phosphorodithioïque, dans lequel parmi les groupes alkyles, au moins 70 % molaire représente des groupes secondaires possédant 6 atomes de carbone, 15 % molaire maximum représente des groupes primaires et 15 % molaire maximum représente des groupes secondaires possédant moins de 6 atomes de carbone.

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