Ashless lubricant composition
AssigneeVanderbilt Chemicals, LLC
InventorsKEVIN J. CHASE, BRIAN W. STUNKEL
Life of this patent
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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.
Claims11
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) a metal-free sulfur-containing compound being a sulfurized fatty acid or an ashless dithiocarbamate,
- (b) a hindered amine;
- and
- (c) a diaryl amine;
- wherein the weight ratio of (a):(b):(c) is about 5:1:4
A lubricating composition comprising at least 90% by weight of a lubricant basestock, and about 1-4% by weight of an antioxidant additive composition comprising:
- (a) methlyenebis(dibutyldithiocarbamate at between about 0.5 and 2%,
- (b) a hindered amine at between about 0.1 and 0.4%, being chosen from the group consisting of
- 4-stearoyloxy-2,2,6,6-tetramethylpiperidine;
- di(2,2,6,6-tetramethylpiperidin-4-yl) sebacate;
- bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate;
- and
- 2,2,6,6-Tetramethylpiperidinyl-4-dodecanate;
- and
- (c) a diaryl amine at between about 0.4 and 1.6%.;
- wherein the weight ratio of (a):(b):(c) is about 5:1:4
Dependencies are inferred from the claim text.