Lubricant compositions
AssigneeInfineum International Limited
InventorsJonathan M. McConnachie, Ian A. W. Bell, Alisdair J. Brown, Edward I. Stiefel, Ernestine W. Hill
Life of this patent
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Abstract
A lubricating oil composition is provided comprising a major amount of an oil of lubricating viscosity and a minor amount of, as an additive, at least one compound comprising a polynuclear molybdenum core and bonded thereto one or more anionic ligands capable of rendering the compound oil-soluble or oil-dispersible, wherein the ratio of the number of molybdenum atoms in the core to the number of said ligands is 1:1, such as 3:2 or greater.
Claims15
A lubricating oil composition comprising, or made by mixing, a major amount of an oil of lubricating viscosity and a minor amount of, as an additive, at least one compound comprising a polynuclear, such as a di- or tri-nuclear, molybdenum core and bonded thereto one or more monoanionic ligands capable of rendering the compound oil-soluble or oil-dispersible, wherein the ratio of the number of molybdenum atoms in the core to the number of said ligands is greater than 1:1, such as 3:2 or greater.
The composition of any preceding claim wherein said ligand or ligands, including L, is or are represented by formulae
- 2
- and mixtures thereof, and perthio derivatives thereof wherein X, X1, X2 and Y are independently selected from the group of oxygen and sulfur, and wherein R1 and R2 independently represent hydrocarbyl groups.
The composition of any of the preceding claims wherein the mass of molybdenum from the compound is at least 1, for example 1 to 2000, such as 5 to 1000, preferably 20 to 1000, ppm based on the mass of the composition.
The composition of any of the preceding claims wherein the total number of carbon atoms in all of the ligands' is at least 21, such as 21 to 800.
The composition of any of the preceding claims wherein the oil of lubricating viscosity is free of sulphur.
The composition of any of the preceding claims further comprising, or made by mixing, at least one antioxidant additive.
The composition of any of the preceding claims further comprising, or made by mixing, one or more dispersants, detergents, pour point depressants, viscosity improvers, surfactants and antiwear agents.
Dependencies are inferred from the claim text.