Patent ID: 6726855
Filing Date: 2004-04-27
Classification: C10M,C10N

Abstract:
A composition comprising lubricating oil selected from the group consisting of polyol esters, diesters, phthalate esters, trimellitate esters, pyromellitate esters, dimer acid esters, and polyoleates and a mixture of antioxidants, said mixture consisting of from about 0.01 to about 10 weight percent of a first antioxidant and from about 0.01 to about 10 weight percent of a second antioxidant, the first antioxidant being a secondary diarylamine of the formula R1â€”NHâ€”R2 where R1 and R2 each independently represent a substituted or unsubstituted aryl group having from 6 to 46 carbon atoms and the second antioxidant being a 2,2,4-trialkyl-1,2-dihydroquinoline or a polymer thereof of the structure: where n=1-1000 and R3 is hydrogen, alkyl, or alkoxy; and wherein the ratio of the first antioxidant to the second antioxidant is from 1:99 to 99:1.