Lubricating oil composition
AssigneeInfineum International Limited
InventorsMark D. Andrews, Benjamin R. Elvidge
Life of this patent
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Abstract
A lubricating oil composition comprising (A) an oil of lubricating viscosity in a major amount; and, (B) as an additive component in a minor amount, an oil-soluble zinc salt of a dithiophosphoric acid, the dithiophosphoric acid being the reaction product of phosphorus pentasulphide with a mixture of at least one first alcohol of the formula ROH where R is an aliphatic hydrocarbyl group having at least four carbon atoms or is an alkaryl group, and at least one second alcohol which is an ester of a polyhydric alcohol.
Claims22
A lubricating oil composition having a phosphorus concentration, expressed as atoms of phosphorus, of not greater than 0.09 mass %, based on the total mass of the composition, the lubricating oil composition comprising:
- (A) an oil of lubricating viscosity in a major amount;
- and,
- (B) as an additive component in a minor amount, an oil-soluble zinc salt of a dithiophosphoric acid, the dithiophosphoric acid being the reaction product of phosphorus pentasulphide with a mixture comprising at least one first alcohol of the formula ROH where R is an aliphatic hydrocarbyl group having at least four carbon atoms or is an alkaryl group, and at least one second alcohol which is an ester of a glycerol and a mono-carboxylic acid containing at least 9 carbon atoms and 0 to 3 carbon-carbon double bonds.
Dependencies are inferred from the claim text.