Patent ID: 8093190

Claim:
A lubricant composition which comprises at least 50 wt % of a lubricating base oil and an oil-soluble metal compound providing between 1 and 1680 parts per million of metal to the lubricant composition, the metal compound being chosen from the group consisting of molybdenum, tungsten, titanium and boron compounds, and an oil-soluble first hindered amine providing between about 0.001 and about 1.5 wt % of oil-soluble hindered amine to the lubricant composition, wherein the first hindered amine is one or more chosen from the group consisting of: (a) a compound of the formula where R 26 is H, O or a hydrocarbon from 1 to 25 carbon atoms, an alkoxy radical with the oxygen bound to the nitrogen with the alkyl portion containing 1 to 25 carbon atoms, or a COR group, the R being a hydrocarbon containing from 1 to 25 carbon atoms; R 27 , R 28 , R 32 , R 33 are hydrocarbons with 1 to 25 carbon atoms; R 29 , R 31 are H or hydrocarbons with 1 to 25 carbon atoms; when n=1, R 30 is OH, H, O, NH 2 , NR 2 where R is a hydrocarbon with 1 to 25 carbon atoms, an ester group O 2 CR where R is a hydrocarbon with 1 to 25 carbon atoms, or a succinimide group; when n=2, R 30 is the diacyl radical of an aliphatic dicarboxylic acid having 4 to 12 carbon atoms; (b) 4-stearoyloxy-2,2,6,6-tetramethylpiperidine, (c) di(2,2,6,6-tetramethylpiperidin-4-yl)sebacate, (d) di(1,2,2,6,6-pentamethylpiperidin-4-yl)sebacate, (e) bis(1-octyloxy-2,2,6,-tetramethyl-4-piperidyl)sebacate (f) polymer-bound piperidine compound, (g) a compound of the group consisting of 2,2,6,6-tetramethylpiperidines, 1,2,2,6,6-pentamethylpiperidines, 1-oxo-2,2,6,6-tetramethylpiperidines, and 1-alkoxy-2,2,6,6-tetramethylpiperidines, and (h) a compound of the group consisting of di(1,2,2,6,6-pentamethylpiperidin-4-yl)sebacate, 4-stearoyloxy-2,2,6,6-tetramethylpiperidine, di(,2,2,6,6-tetramethylpiperidin-4-yl)sebacate and bis(1-octyloxy-2,2,6,-tetramethyl-4-piperidyl)sebacate.