Lubricant composition
AssigneeBASF SE
InventorsMichael D. Hoey, David Chasan, Jeffrey Schoonmaker, Ryan Fenton
Life of this patent
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Abstract
Lubricant compositions comprising a base oil, one or more antioxidants selected from a group consisting of N-α-naphthyl-N-phenylamine antioxidants and diphenylamine antioxidants; and one or more sulfur-containing additives exhibit outstanding oxidative stability and non-corrosion properties. The N-α-naphthyl-N-phenylamine antioxidants plus diphenylamine antioxidants in total may be present from about 0.2 wt % to about 0.8 wt %, based on the total weight of the lubricant composition. The sulfur provided by the sulfur-containing additives, in total, may be present from about 50 ppm to about 1000 ppm by weight, based on the total weight of the lubricant composition.
Claims18
A lubricant composition comprising
- a base oil,
- about 0.2 wt % to about 0.8 wt % of one or more N-α-naphthyl-N-phenylamine antioxidants and one or more diphenylamine antioxidants, in total, based on the total weight of the lubricant composition, wherein the one or more N-α-naphthyl-N-phenylamine antioxidants are of formula
- wherein
- R is C1-C18 alkyl, C2-C18 alkenyl, C2-C18 alkynyl, —C(O) C1-C18 alkyl or —C(O)aryl;
- R1, R2, R3 and R4 are each independently H, C1-C18 alkyl, C1-C18 alkoxy, C1-C18 alkylamino, C1-C18 dialkylamino, C1-C18 alkylthio, C2-C18 alkenyl, C2-C18 alkynyl or C7-C21 aralkyl with the proviso that when R is C3 alkenyl, R2 or R3 is not hydrogen;
- and
- one or more sulfur-containing additives comprising one or more di-tert-alkyl polysulfides in an effective amount to provide a sulfur concentration, in total, ranging from about 50 ppm to about 1000 ppm by weight, based on the total weight of the lubricant composition.
An additive package comprising:
- a) one or more N-α-naphthyl-N-phenylamine antioxidants, wherein the one or more N-α-naphthyl-N-phenylamine antioxidants are of formula
- wherein
- R is C1-C18 alkyl, C2-C18 alkenyl, C2-C18 alkynyl, —C(O) C1-C18 alkyl or —C(O)aryl;
- R1, R2, R3 and R4 are each independently H, C1-C18 alkyl, C1-C18 alkoxy, C1-C18 alkylamino, C1-C18 dialkylamino, C1-C18 alkylthio, C2-C18 alkenyl, C2-C18 alkynyl or C7-C21 aralkyl with the proviso that when R is C3 alkenyl, R2 or R3 is not hydrogen;
- or
- b) one or more diphenylamine antioxidants;
- or
- both a) and b);
- and
- c) one or more sulfur-containing additives comprising one or more di-tert-alkyl polysulfides,
- wherein a weight/weight ratio of a) to b) is from about 1/1 to about 1/9, and
- wherein c) is present from about 2 wt % to about 30 wt %, based on the total weight of a)+b)+c).
A process for preparing a lubricant composition, the process comprising:
- incorporating
- one or more N-α-naphthyl-N-phenylamine antioxidants and one or more diphenylamine antioxidants;
- and
- one or more sulfur-containing additives comprising one or more di-tert-alkyl polysulfides in an effective amount to provide for a sulfur concentration, in total, of from about 50 ppm to about 1000 ppm by weight, based on the total weight of the lubricant composition;
- into a base oil,
- wherein the one or more N-α-naphthyl-N-phenylamine antioxidants and one or more diphenylamine antioxidants are present in the lubricant composition, in total, in an amount of about 0.2 wt % to about 0.8 wt %, based on the total weight of the lubricant composition, and
- wherein the one or more N-α-naphthyl-N-phenylamine antioxidants are of formula
- wherein
- R is C1-C18 alkyl, C2-C18 alkenyl, C2-C18 alkynyl, —C(O) C1-C18 alkyl or —C(O)aryl;
- R1, R2, R3 and R4 are each independently H, C1-C18 alkyl, C1-C18 alkoxy, C1-C18 alkylamino, C1-C18 dialkylamino, C1-C18 alkylthio, C2-C18 alkenyl, C2-C18 alkynyl or C7-C21 aralkyl,
- with the proviso that when R1 and R4 are both H or H and C1-C18 alkyl, R is not H, and
- with the proviso that when R is C3 alkenyl, R2 or R3 is not hydrogen.
Dependencies are inferred from the claim text.