Friction modifiers for engine oils

摘要

An engine oil comprising a major amount of a base oil and a minor amount of an additive package, wherein the additive package comprises at least one friction modifier represented by the formula:;
wherein R is selected from a hydrocarbyl group having 12 to 28 carbon atoms, a heteroatom containing hydrocarbyl having 12 to 32 carbon atoms, or a group represented by the formula:
;
wherein R1 and R2 are independently selected from hydrocarbyl carbonyl moieties having 12 to 28 carbon atoms, or R1 and R2 form a hydrocarbon dicarbonyl containing ring with 12 to 32 carbon atoms, and R3 and R4 are independently selected from alkyl groups having 1 to 18 carbon atoms. Methods of using the engine oil to improve thin film and/or boundary layer friction in an engine are also provided.

主权项

1. A method for improving thin film friction and boundary friction in an engine comprising a step of lubricating a crankcase of a gasoline-fueled passenger car engine with a passenger car engine oil that is a crankcase oil for a crankcase of a gasoline-fueled passenger car engine and wherein said crankcase oil for a gasoline-fueled passenger car engine comprises a major amount of a base oil and a minor amount of an additive package, wherein the additive package comprises at least one friction modifier represented by the formula (I): wherein R is selected from a hydrocarbyl group, branched, saturated, partially saturated, or unsaturated, having about 12 to about 28 carbon atoms, a heteroatom containing hydrocarbyl group having about 12 to about 32 carbon atoms, or a group represented by the formula II: wherein R1 and R2 are independently selected from hydrocarbyl carbonyl moieties having about 12 to about 28 carbon atoms, or R1 and R2 form a hydrocarbon dicarbonyl containing ring with about 12 to about 32 carbon atoms, and wherein R3 and R4 are independently selected from alkyl groups having about 1 to about 18 linear or branched carbon atoms.