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.
Claims3
A lubricating composition comprising at least 95% by weight of a lubricant basestock, and about 1-4% by weight of an antioxidant additive composition comprising:
- (a) methylenebis(dibutyldithiocarbamate);
- (b) a hindered amine selected from the group consisting of 4-stearoyloxy-2,2,6,6-tetramethylpiperidine, bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, bis(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate and 2,2,6,6-tetramethylpiperidinyl-4-dodecanoate;
- and
- (c) a diaryl amine;
- wherein the weight ratio of (a):(b):(c) is about 5:1:4.
A lubricating composition comprising at least 95% by weight of a lubricant basestock, and about 1-4% by weight of an antioxidant additive composition comprising:
- (a) methylenebis(dibutyldithiocarbamate) at between about 0.5 and 2 wt %,
- (b) a hindered amine selected from the group consisting of 4-stearoyloxy-2,2,6,6-tetramethylpiperidine and di(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, at between about 0.1 and 0.4 wt %, and
- (c) a diaryl amine at between about 0.4 and 1.6 wt %;
- wherein the weight ratio of (a):(b):(c) is about 5:1:4.
Dependencies are inferred from the claim text.