Lubricating compositions containing sulphonates

C - Chemistry – Metallurgy – 10 – M

Patent

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C10M 163/00 (2006.01) C10M 159/20 (2006.01)

Patent

CA 2583420

A lubricating composition containing (a) a detergent package containing (i) an oligomeric reaction product of (1) a hydrocarbyl-substituted phenol; (2) an aldehyde; and (3) a carboxyl-substituted phenol or a carboxyl-substituted phenylamine; and salts of the reaction product; (ii) a sulphonate; and (iii) optionally a phenate; (b) a dispersant; and (c) an oil of lubricating viscosity, wherein the sulphonate detergent is overbased with a metal ratio of about 12.5:1 to about 40:1. The composition is suitable for internal combustion engines, particularly marine diesel applications to provide improved cleanliness properties, antiwear performance or deposit control.

L'invention concerne une composition lubrifiante contenant : (a) un ensemble détergent contenant (i) un produit de réaction oligomère (1) d'un phénol à substitution hydrocarbyle, (2) d'un aldéhyde et (3) d'un phénol à substitution carboxyle ou une phénylamine à substitution carboxyle ; et des sels du produit de réaction ; (ii) un sulfonate ; et (iii) éventuellement un phénate ; (b) un agent dispersant ; et (c) une huile à viscosité de lubrification, le détergent sulfonate étant surbasique avec un taux de métal allant d'environ 12,5/1 à environ 40/1. La composition est appropriée pour les moteurs à combustion interne, en particulier les diesels utilisés en marine, pour assurer une meilleure propreté, résistance à l'usure ou réduction des dépôts.

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