Patent ID: 6300288
Filing Date: 2001-10-09
Classification: C10M,C10N

Abstract:
A grease composition comprising.(a) an oil of lubricating viscosity;(b) about 0.1 to about 10 weight percent of a polyolefin having grafted carboxylic acid functionality, wherein the grafted polyolefin is an .alpha.-olefin/diene copolymer or a hydrogenated .alpha.-olefin/diene copolymer, said polyolefin having a number average molecular weight of at least about 50,000;(c) a metallic species selected from the group consisting of alkali metals, alkaline earth metals, and aluminum, capable of interacting with the acid functionality of said polyolefin to cause association among the acid groups; and(d) a co-thickening agent selected from the group consisting of simple metal soap thickeners, soap complexes, non-soap thickeners, oils functionalized by grafting reaction with ethylenically unsaturated mono- or dicarboxylic acids having 4 to 10 carbon atoms, and metal salts of such acid-functionalized oils;said polyolefin being present in an amount sufficient to increase the viscosity of the composition; said polyolefin having been combined with the other components under grease-forming conditions of heating and mixing to form the grease composition;wherein the amount of carboxylic acid functionality derived from the grafted polymer in the composition is about 0.001 to about 0.1 weight percent.