Lubricating composition with improved TBN retention
AssigneeThe Lubrizol Corporation
InventorsMary Galic Raguz, Virginia A. Carrick
Life of this patent
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Abstract
The invention provides a lubricating composition containing a diarylamine, an aminobenzene and an oil of lubricating viscosity. The invention further relates to the use of the lubricating composition in an internal combustion engine. The invention further relates to the use of the lubricating composition to improve TBN retention.
Claims9
A lubricating composition comprising
- (a) an oil of lubricating viscosity,
- (b) about 0.1 to about 2 percent by weight of a diarylamine wherein at least one of the aryl groups comprises two or more edge-sharing rings, which comprises an alkylated N-phenyl-α-naphthylamine,
- (c) about 0.5 to about 4 percent by weight of an anthranilate ester different from (b), being a compound of formula (IIa)
- wherein X is oxygen or sulfur and A is X2—R8 where X2 is oxygen or sulfur and R8 is a hydrocarbyl group;
- R1 and R2 are independently hydrogen;
- hydrocarbyl groups;
- hydrocarbyl groups linked together to form a ring;
- —CH2CH2CN;
- or —CH2CH2C(O)XR6, where X is —O—, —S—, or —NR6—, R6 is hydrogen, or a hydrocarbyl group or —(CH2CHR7—O—)yH where R7 is hydrogen or a hydrocarbyl group and y=1 to 20;
- and R4, and R5 are independently hydrogen, hydrocarbyl groups or taken together form a ring, and
- (d) an overbased detergent in an amount that delivers at least 2 TBN to the lubricating composition.
A method of improving the oxidative stability of a lubricating composition which contains an oil of lubricating viscosity, comprising including within said lubricating composition a combination of
- (b) about 0.1 to about 2 percent by weight of a diarylamine wherein at least one of the aryl groups comprises 2 or more edge-sharing rings, which comprises an alkylated N-phenyl-α-naphthylamine,
- (c) about 0.5 to about 4 percent by weight of an anthranilate ester different from (b), being a compound of formula (IIa)
- wherein X is oxygen or sulfur and A is X2—R8 where X2 is oxygen or sulfur and R8 is a hydrocarbyl group;
- R1 and R2 are independently hydrogen;
- hydrocarbyl groups;
- hydrocarbyl groups linked together to form a ring;
- —CH2CH2CN;
- or —CH2CH2C(O)XR6, where X is —O—, —S—, or —NR6—, R6 is hydrogen, or a hydrocarbyl group or —(CH2CHR7—O—)yH where R7 is hydrogen or a hydrocarbyl group and y=1 to 20;
- and R4, and R5 are independently hydrogen, hydrocarbyl groups or taken together form a ring, and
- (d) an overbased detergent in an amount that delivers at least 2 TBN to the lubricating composition.
A method of improving TBN retention of a lubricating composition which contains an oil of lubricating viscosity, comprising including within said lubricating composition a combination of
- (b) about 0.1 to about 2 percent by weight of a diarylamine wherein at least one of the aryl groups comprises 2 or more edge-sharing rings, which comprises an alkylated N-phenyl-α-naphthylamine,
- (c) about 0.5 to about 4 percent by weight of an anthranilate ester different from (b), being a compound of formula (IIa)
- wherein X is oxygen or sulfur and A is X2—R8 where X2 is oxygen or sulfur and R8 is a hydrocarbyl group;
- R1 and R2 are independently hydrogen;
- hydrocarbyl groups;
- hydrocarbyl groups linked together to form a ring;
- —CH2CH2CN;
- or —CH2CH2C(O)XR6, where X is —O—, —S—, or —NR6—, R6 is hydrogen, or a hydrocarbyl group or —(CH2CHR7—O—)yH where R7 is hydrogen or a hydrocarbyl group and y=1 to 20;
- and R4, and R5 are independently hydrogen, hydrocarbyl groups or taken together form a ring, and
- (d) an overbased detergent in an amount that delivers at least 2 TBN to the lubricating composition.
Dependencies are inferred from the claim text.