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US 4,767,551 AGranted
Metal-containing lubricant compositions
AssigneeAmoco Corporation
InventorsMack W. Hunt, Steven Kennedy
Life of this patent
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Abstract
A metal-containing lubricant composition containing an overbased copper metal-containing compound is disclosed which improves high speed, high temperature operation of gasoline and diesel engines. The overbased copper metal-containing compound acts as a dispersant/detergent and oxidation and corrosion inhibitor and avoids the acceleration of wear rates typical of many copper compounds.
Claims16
A lubricating oil composition comprising:
- (a) a major amount of a lubricating oil;
- (b) from 0 to 10 (wt) % of an ashless dispersant compound;
- (c) from 0 to 10 (wt) % of at least one viscosity index improver selected from the group consisting of a nitrogen-containing polymeric viscosity index improver dispersant, an ester-containing polymeric viscosity index improver dispersant, and a non-dispersant viscosity index improver;
- and (d) from 0.01 to 10.0 parts by weight per 100 parts of said lubricating oil composition of zinc dialkyldithiophosphate and characterized in that the lubricant oil composition further contains from 0.1 to 5.0 (wt) % of a dispersant/detergent, antioxidant, and corrosion inhibitor comprising at least one overbased copper metal-containing compound selected from the group consisting of an overbased copper magnesium sulfonate, an overbased copper calcium sulfonate, an overbased copper sodium sulfonate, and an overbased copper calcium phenate.
1 more element
A concentrate of a lubricating oil composition wherein said concentrate comprises (a) from 0 to 65 (wt) % of an ashless dispersant;
- (b) from 0 to 20 (wt) % of at least one viscosity index improver selected from the group consisting of a nitrogen-containing polymeric viscosity index improver dispersant, an ester-containing polymeric viscosity index improver dispersant, and a non-dispersant polymeric viscosity index improver;
- and (c) from to 2 to 25 parts by weight of a zinc dialkyldithiophosphate and from 5 to 25 (wt) % of a dispersant/detergent, antioxidant, and corrosion inhibitor comprising an overbased copper metal-containing compound selected from the group consisting of an overbased copper magnesium sulfonate, an overbased copper calcium sulfonate, an overbased copper sodium sulfonate and an overbased copper calcium phenate.
Dependencies are inferred from the claim text.