Lubricant composition
AssigneeBASF SE
InventorsMichael Hoey, David Eliezer Chasan, Jeffrey Schoonmaker, Ryan James 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 a sulfur-containing additive comprising up to seven carbon atoms 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 additive may be present from about 50 ppm to about 1000 ppm by weight, based on the total weight of the lubricant composition.
Claims14
A lubricant composition comprising
- a base oil,
- one or more antioxidants selected from a group consisting of N-α-naphthyl-N-phenylamine antioxidants and diphenylamine antioxidants;
- and
- a sulfur-containing additive which is a mixture of sulfurized isobutylene compounds having from 1 to 5 sulfur atoms,
- wherein the mixture of sulfurized isobutylene compounds comprises from about 2.5% to about 12.5% sulfurized isobutylene with one sulfur atom, about 32.5% to about 42.5% sulfurized isobutylene with two sulfur atoms, from about 30% to about 40% sulfurized isobutylene with three sulfur atoms, from about 5% to about 15% sulfurized isobutylene with four sulfur atoms, and from about 1% to about 11% sulfurized isobutylene with five sulfur atoms, and
- wherein a total sulfur concentration provided by the sulfur-containing additive ranges 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 or b) one or more diphenylamine antioxidants;
- and
- c) a sulfur-containing additive comprising up to 7 carbon atoms.
A process for preparing a lubricant composition, the process comprising incorporating one or more antioxidants selected from a group consisting of N-α-naphthyl-N-phenylamine antioxidants and diphenylamine antioxidants;
- and
- a sulfur-containing additive which is a mixture of sulfurized isobutylene compounds having from 1 to 5 sulfur atoms into a base oil,
- wherein the mixture of sulfurized isobutylene compounds comprises from about 2.5% to about 12.5% sulfurized isobutylene with one sulfur atom, about 32.5% to about 42.5% sulfurized isobutylene with two sulfur atoms, from about 30% to about 40% sulfurized isobutylene with three sulfur atoms, from about 5% to about 15% sulfurized isobutylene with four sulfur atoms, and from about 1% to about 11% sulfurized isobutylene with five sulfur atoms, and
- wherein a total sulfur concentration provided by the sulfur-containing additive ranges from about 50 ppm to about 1000 ppm by weight, based on the total weight of the lubricant composition.
Dependencies are inferred from the claim text.