Ashless lubricant composition
AssigneeVanderbilt Chemicals, LLC
InventorsKEVIN J. CHASE, BRIAN W. STUNKEL
Life of this patent
Estimating the term…
Abstract
A lubricant composition with improved antioxidant capability is provided by way of an additive composition containing a metal free sulfur-containing compound, an aromatic amine, and a hindered amine. Particularly effective metal-free sulfur-containing compounds include ashless dithiocarbamates, such as methylenebis(dibutyldithiocarbamate), and sulfurized fatty acids.
Claims6
1-16. (canceled)
A lubricating composition comprising at least 90% by weight of a lubricant basestock, and about 0.5-5% by weight of an antioxidant additive composition comprising:
- (a) an ashless dithiocarbamate;
- (b) a hindered amine being one or more chosen from the group consisting of:
- (1) a compound of the formula
- where R26 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;
- R27, R28, R32, R33 are hydrocarbons with 1 to 25 carbon atoms;
- R29, R31 are H or hydrocarbons with 1 to 25 carbon atoms;
- when n=1, R30 is OH, H, O, NH2, NR2 where R is a hydrocarbon with 1 to 25 carbon atoms, an ester group O2CR where R is a hydrocarbon with 1 to 25 carbon atoms, or a succinimide group;
- when n=2, R30 is the diacyl radical of an aliphatic dicarboxylic acid having 4 to 12 carbon atoms;
- (2) 4-stearoyloxy-2,2,6,6-tetramethylpiperidine,
- (3) di(2,2,6,6-tetramethylpiperidin-4-yl) sebacate,
- (4) di(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate,
- (5) bis (1-octyloxy-2,2,6, -tetramethyl-4-piperidyl) sebacate
- (6) polymer-bound piperidine compound,
- (7) 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
- (8) 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-y1) sebacate and bis (1-octyloxy-2,2,6,-tetramethyl-4-piperidyl) sebacate;
- and
- (c) a diaryl amine,
- wherein the weight ratio of (a):(b):(c) is about 5:1:4.
The lubricating composition according to claim 1, wherein the additive composition comprises by weight % of the lubricating composition:
- (a) the metal-free sulfur-containing compound at about 0.5%,
- (b) the hindered amine at about 0.1%, and
- (c) the diaryl amine at about 0.4%.
The lubricating composition according to claim 1, wherein the ashless dithiocarbamate is methlyenebis(dibutyldithiocarbamate).
The lubricating composition according to claim 1, wherein the hindered amine is chosen from the group consisting of 4-stearoyloxy-2,2,6,6-tetramethylpiperidine;
- di(2,2,6,6-tetramethylpiperidin-4-yl) sebacate;
- di(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate;
- and 2,2,6,6-tetramethylpiperidinyl-4-dodecanate
A lubricating composition comprising at least 90% by weight of a lubricant basestock, and about 0.5-5% by weight of an antioxidant additive composition comprising:
- (a) a sulfurized fatty acid,
- (b) a hindered amine being one or more chosen from the group consisting of:
- (1) a compound of the formula
- where R26 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;
- R27, R28, R32, R33 are hydrocarbons with 1 to 25 carbon atoms;
- R29, R31 are H or hydrocarbons with 1 to 25 carbon atoms;
- when n=1, R30 is OH, H, O, NH2, NR2 where R is a hydrocarbon with 1 to 25 carbon atoms, an ester group O2CR where R is a hydrocarbon with 1 to 25 carbon atoms, or a succinimide group;
- when n=2, R30 is the diacyl radical of an aliphatic dicarboxylic acid having 4 to 12 carbon atoms;
- (2) 4-stearoyloxy-2,2,6,6-tetramethylpiperidine,
- (3) di(2,2,6,6-tetramethylpiperidin-4-yl) sebacate,
- (4) di(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate,
- (5) bis (1-octyloxy-2,2,6,-tetramethyl-4-piperidyl) sebacate
- (6) polymer-bound piperidine compound,
- (7) 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
- (8) 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, and
- (c) a diaryl amine
Dependencies are inferred from the claim text.