Lithium borate complex grease exhibiting salt water corrosion resistance
AssigneeExxon Research & Engineering Co.
InventorsGeorge A. Clarke, Jr., Gary L. Harting
Life of this patent
Estimating the term…
Abstract
A lubricating grease having an exceptional ability to protect metal bearing surfaces against rusting or corrosion in the presence of salt water contains a synergistic combination of a lithium complex grease thickener, a quaternary ammonium nitrate and an amino imidazoline. The grease thickener is a complex of a lithium soap of a C.sub.12 to C.sub.24 hydroxy fatty acid and a monolithium salt of boric acid, and can include as a third component a lithium salt of a second hydroxycarboxylic acid such as salicyclic acid
Claims7
A lubricating grease composition of high dropping point and capable of protecting metal surfaces against salt water corrosion which comprises a major proportion of a mineral lubricating oil, from about 2 to 30 wt. % of a thickener system whose essential components include a lithium soap of a C.sub.12 to C.sub.24 hydroxy fatty acid and a monolithium salt of boric acid, wherein there are from 3 to 100 parts by weight of hydroxy fatty acid per part by weight of boric acid, and a salt-water-corrosion resisting amount of a combination of a dialkyl dimethyl ammonium nitrite, wherein the alkyl groups have 8 to 18 carbon atoms, and an amino imidazoline of the general structure:
- ##EQU3## wherein n is about 2 to 6, R is a C.sub.6 to C.sub.22 aliphatic hydrocarbon group and R' is hydrogen or a C.sub.1 to C.sub.12 alkyl group.
Dependencies are inferred from the claim text.