Friction modified lubricants
AssigneeEthyl Corporation
InventorVasudevan Balasubramaniam
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Abstract
Mixtures of the reaction product of at least one C5-C60 carboxylic acid and at least one amine selected from the group consisting of guanidine, aminoguanidine, urea, thioruea and salts thereof and a phosphorus-containing dispersant are useful as gear oil additives. Lubricant formulations containing said mixtures exhibit excellent low and high temperature rheology and are particularly suited for use in automotive and industrial gear applications. Lubricants of the present invention exhibit improved performance properties such as increased axle efficiencies and lower axle temperatures compared to lubricant formulations that do not contain said mixtures.
Claims31
A lubricant composition comprising:
- (A) from about 40 to about 85 weight percent, based on the total weight of the lubricant composition, of an oil of lubricating viscosity;
- (B) from about 0.01 to about 5 wt. %, based on the total weight of the lubricant composition, of the reaction product of at least one C5-C60 carboxylic acid and at least one amine selected from the group consisting of guanidine, aminoguanidine, urea, thioruea and salts thereof;
- (C) from about 0.5 to about 7.5 wt. % of a phosphorus-containing dispersant;
- and
- (D) from 2 to 25 weight percent, based on the total weight of the lubricant composition, of a gear additive package;
- wherein the lubricant composition is an automotive or industrial gear lubricant.
Dependencies are inferred from the claim text.