Multi-vehicle automatic transmission fluid
AssigneeAfton Chemical Corporation
InventorsJoseph B. Carroll, Christopher S. Cleveland
Life of this patent
Estimating the term…
Abstract
A lubricant composition, a multi-vehicle transmission fluid, and a method for making a transmission fluid. The lubricant composition includes a) a base oil; b) 2,5-dimercapto-1,3,4-thiadiazole (DMTD), a derivative of DMTD, or mixtures thereof; and c) a friction modifier. The friction modifier is made by reacting an olefin containing at least 40% by weight C10-C36 vinylidene olefin with maleic acid, anhydride, or ester to provide a first reaction product, and aminating the first reaction product with an effective amount of a compound containing basic nitrogen to provide the friction modifier. The C10-C36 vinylidene olefin is represented by the following formula: wherein Rc and Rd are independently a (C3-C15) alkyl, cycloalkyl or cycloalkenyl.
Claims17
A lubricant composition for a transmission fluid comprising:
- a). a base oil;
- b). 2,5-dimercapto-1,3,4-thiadiazole (DMTD), a derivative of DMTD, or mixtures thereof;
- c). a friction modifier made by:
- i). reacting an olefin, wherein at least 40% by weight of the olefin is a C10-C36 vinylidene olefin that was reacted under acid-catalysis condition then treated with maleic acid, anhydride, or ester to provide a first reaction product;
- and
- ii). aminating the reaction product with an effective amount of a compound containing basic nitrogen to provide the friction modifier,
- wherein C10-C36 vinylidene olefin is represented by the following formula:
- wherein Rc and Rd are independently a (C3-C15) alkyl, cycloalkyl or cycloalkenyl, wherein the friction modifier (c) provides from about 50 to about 800 ppm by weight of nitrogen to the lubricant composition based on a total weight of the lubricant composition and wherein a weight ratio of nitrogen (ppm) contributed by the friction modifier (c), to the sulfur (ppm) contributed by said DMTD or DMTD derivative, or mixtures thereof (b), ranges from about 0.25:1 to about 1.25:1.
A transmission for a vehicle comprising a lubricant composition, wherein said lubricant composition comprises:
- a). a base oil;
- b). 2,5-dimercapto-1,3,4-thiadiazole (DMTD), a derivative of DMTD, or mixtures thereof;
- and
- c). a friction modifier made by:
- i). reacting an olefin, wherein at least 40% by weight of the olefin is a C10-C36 vinylidene olefin that was reacted under acid-catalysis condition then treated with maleic acid, anhydride, or ester to provide a first reaction product;
- and
- ii). aminating the first reaction product with an effective amount of a compound containing basic nitrogen to provide the friction modifier,
- wherein said C10-C36 vinylidene olefin is represented by the following formula:
- wherein Rc and Rd are independently a (C3-C15) alkyl, cycloalkyl or cycloalkenyl, wherein the friction modifier (c) provides from about 50 to about 800 ppm by weight of nitrogen to the lubricant composition based on a total weight of the lubricant composition and wherein a weight ratio of nitrogen (ppm) contributed by the friction modifier (c), to the sulfur (ppm) contributed by said DMTD or DMTD derivative, or mixtures thereof (b), ranges from about 0.25:1 to about 1.25:1.
A method for providing a multi-vehicle transmission fluid comprising:
- blending an oil of lubricating viscosity with:
- i). from about 100 to about 2000 ppm by weight 2,5-dimercapto-1,3,4-thiadiazole (DMTD), a derivative of DMTD, or mixtures thereof in terms of sulfur content of the transmission fluid derived from component (i);
- and
- ii). from about 50 to about 800 ppm friction modifier in term of nitrogen content by weight of the total weight of the transmission fluid, wherein the friction modifier is made by:
- a). reacting an olefin containing at least 40% by weight of a C10-C36 vinylidene olefin that was reacted under acid-catalysis condition then treated with maleic acid, anhydride, or ester to provide a first reaction product;
- and
- b). aminating the first reaction product with an effective amount of a compound containing basic nitrogen to provide the friction modifier,
- wherein said C10-C36 vinylidene olefin is represented by the following formula:
- wherein Rc and Rd are independently a (C3-C15) alkyl, cycloalkyl or cycloalkenyl, wherein a weight ratio of nitrogen (ppm) contributed by the friction modifier (c), to the sulfur (ppm) contributed by said DMTD or DMTD derivative, or mixtures thereof (b), ranges from about 0.25:1 to about 1.25:1.
Dependencies are inferred from the claim text.