Lubricant with improved anti-corrosion properties
AssigneeThe Lubrizol Corporation
InventorsThomas B. Pavilon, Brent R. Dohner, Jerry L. Rutter
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Abstract
An additive composition of (a) a substituted aromatic triazole and (b) a hydrocarbyl substituted succinic acylated polyamine dispersant, reacted with a boron compound, imparts improved corrosion resistance to lubricating oils which contain a multifunctional olefin copolymer viscosity index modifier.
Claims31
A lubricant composition comprising a major proportion of an oil of lubricating viscosity, a minor proportion of a multifunctional olefin copolymer viscosity index modifier, and a minor proportion of an additive composition comprising:
- (a) about 0.001 to about 1 percent by weight of the lubricant composition of a benzotriazole substituted on a nitrogen atom by reacting the benzotriazole with an aldehyde and a primary or secondary amine or an alcohol and
- (b) about 0.5 to about 5 percent by weight of the lubricant composition of the reaction product of a hydrocarbylsubstituted acylating agent, a polyamine, and a boron compound.
The composition of claim 7 wherein the benzotriazole is reacted with the aldehyde and a primary or secondary amine.
A concentrate comprising a concentrate-forming proportion of an oil of lubricating viscosity, a multi-functional olefin copolymer viscosity index modifier, and an additive composition comprising:
- (a) a benzotriazole substituted on a nitrogen atom by reacting the benzotriazole with an aldehyde and a primary or secondary amine or an alcohol and
- (b) the reaction product of a hydrocarbyl-substituted acylating agent, a polyamine, and a boron compound wherein (a) and (b) are present in the ratio of about 1:3 to about 1:120 by weight.
Dependencies are inferred from the claim text.