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US 7,407,919 B2Granted
Sulfonate detergent system for improved fuel economy
AssigneeThe Lubrizol Corporation
InventorsMelody A. Wilk, Brent R. Dohner, Frank V. Zalar, Jack C. Kelley
Life of this patent
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Abstract
A composition for lubricating an internal combustion engine includes an oil of lubricating viscosity; a predominantly linear alkylbenzenesulfonate detergent having a metal ratio of at least 8; and a combination of hindered phenolic ester antioxidant and aromatic amine antioxidant. The amount of any phenate detergent is less than 15% by weight of the total amount of detergents.
Claims13
A composition suitable for lubricating an internal combustion engine, comprising:
- (a) an oil of lubricating viscosity;
- (b) an overbased detergent, wherein the detergent is exclusively or predominantly a linear alkylbenzenesulfonate detergent having a metal ratio of at least about 8, wherein in said composition the amount of phenate detergent is less than about 15% by weight of the total amount of detergents
- (c) a combination of antioxidants comprising
- (i) about 0.1 to about 2 weight percent hindered phenolic ester antioxidant and
- (ii) about 0.2 to about 2 weight percent aromatic amine antioxidant;
- and
- (d) at least one further component selected from the group consisting of dispersants, zinc dialkyldithiophosphates, and friction modifiers.
4 more elements
A composition suitable for lubricating an internal combustion engine, comprising:
- (a) an oil of lubricating viscosity;
- (b) an overbased detergent, wherein the detergent is exclusively or predominantly a synthetic linear alkylbenzenesulfonate detergent having a metal ratio of at least about 8 and the alkylbenzene group therein having a number average molecular weight of about 320 to about 700, wherein in said composition the amount of phenate detergent is less than about 1% by weight of the total amount of detergents and the total amount of detergents other than the alkylbenzenesulfonate is less than about 15% by weight of the total amount of detergents;
- (c) a combination of antioxidants comprising
- (i) about 0.1 to about 2 weight percent hindered phenolic ester antioxidant,
- (ii) about 0.2 to about 2 weight percent aromatic amine antioxidant, and
- (iii) about 0.1 to about 1 weight percent of a sulfurized olefin antioxidant;
- and
- (d) a zinc dialkyldithiophosphate wherein said alkyl groups are predominantly secondary, in an amount to deliver about 0.025 to about 0.1 weight percent phosphorus to the composition;
- wherein the composition contains less than about 300 parts per million by weight of metals other than calcium or zinc.
6 more elements
A concentrate comprising
- (a) a concentrate-forming amount of an oil of lubricating viscosity;
- (b) an overbased detergent, wherein the detergent is exclusively or predominantly a linear alkylbenzenesulfonate detergent having a metal ratio of about at least about 8 and the alkylbenzene group therein having a number average molecular weight of about 320 to about 700, wherein in said composition the amount of phenate detergent is less than about 15% by weight of the total amount of detergents;
- (c) a combination of antioxidants comprising
- (i) hindered phenolic ester antioxidant and
- (ii) aromatic amine antioxidant;
- and
- (d) at least one further component selected from the group consisting of dispersants, zinc dialkyldithiophosphates, and friction modifiers.
4 more elements
Dependencies are inferred from the claim text.