Patent ID: 7585821
Filing Date: 2009-09-08
Classification: C10M,C10N

Abstract:
1. A lubricating oil composition made by admixing: (a) oil of lubricating viscosity; (b) a nitrogen-containing dispersant; and (c) a modified detergent comprising the reaction product of: (i) an overbased oil soluble detergent comprising an alkali- or alkaline earth metal hydrocarbyl phenate, carboxylate or sulfonate; and (ii) from about 0.5 to about 6 wt. %, based on the total weight of active product, of an α, β-unsaturated carbonyl compound selected from the group consisting of maleic anhydride, citraconic anhydride, alkyl maleic anhydride, cycloalkyl maleic anhydride, acrylic anhydride and methacrylic anhydride; wherein said nitrogen-containing dispersant contributes from about 0.04 to about 0.15 wt. % of nitrogen to said composition and a ratio of wt. % of nitrogen-containing dispersant to wt. % of modified detergent is from about 2:1 to about 7.