Methods of reducing lead corrosion in an internal combustion engine
AssigneeAfton Chemical Corporation
InventorSamuel Bruce Field
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Abstract
The present disclosure describes lubricant compositions effective to reduce lead corrosion through an admixture of lubricant additives including at least a base oil of lubricating viscosity, a dispersant, a friction modifier, and boron-containing compound.
Claims27
A method of reducing lead corrosion in an internal combustion engine lubricated with a lubricating oil composition, the method comprising supplying to the internal combustion engine a lubricating oil composition including a hydrocarbyl substituted succinimide dispersant obtained from a hydrocarbyl substituted acylating agent reacted with a nitrogen source, a nitrogen-free organic friction modifier having carboxylic acid and/or hydroxyl groups, and a major amount of a base oil or a blend of base oils of lubricating viscosity;
- wherein the lubricating oil composition includes an admixture of a boron-containing compound selected from boric acid or boronic acid, the hydrocarbyl substituted succinimide dispersant, and the nitrogen-free organic friction modifier;
- wherein the boron-containing compound has the structure X—B—(OH)2 wherein X is a hydroxyl group, a linear or branched alkyl group, a cyclic hydrocarbyl group, one or more aromatic groups, a benzofuranyl group, a dibenzofuranyl group, or combinations thereof;
- and
- wherein the method reduces lead corrosion in the internal combustion engine as compared to a method including a lubricating oil composition with reaction products of the boron-containing compound.
A lubricating oil composition for reducing lead corrosion in an internal combustion engine, the lubricating oil composition comprising:
- an admixture of a hydrocarbyl substituted succinimide dispersant, a nitrogen-free organic friction modifier, and a boron-containing compound;
- the hydrocarbyl substituted succinimide dispersant obtained from a hydrocarbyl substituted acylating agent reacted with a nitrogen source;
- the nitrogen-free organic friction modifier having carboxylic acid and/or hydroxyl groups;
- the boron-containing compound selected from boric acid or boronic acid, wherein the boron-containing compound has the structure X—B—(OH)2 wherein X is a hydroxyl group, a linear or branched alkyl group, a cyclic hydrocarbyl group, one or more aromatic groups, a benzofuranyl group, a dibenzofuranyl group, or combinations thereof;
- a major amount of a base oil or blend of base oils of lubricating viscosity;
- and
- wherein the lubricating composition has a lead corrosion lower than a lead corrosion of a lubricating composition including reaction products of the boron-containing compound.
Dependencies are inferred from the claim text.