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OwnerMark Winemiller, Douglas Deckman +3inventors
InventorsMark Winemiller, Douglas Deckman, William Maxwell, William Buck, David Baillargeon
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The present invention concerns friction reducers for use in lubricating oil compositions which comprise certain groups of aromatic compounds, esters, narrow mixtures of base stocks, and/or amorphous polymers such as amorphous olefin copolymers. These compositions can provide substantial reductions in the coefficient of friction and fuel economy improving benefits when admixed to lubricating oils without deleterious effects such as instability, undesirable high viscosities and deposits. In one aspect of the invention, pentaerythritol esters and optionally triol esters are added to lubricating oil compositions to provide reduced friction and improved fuel economy. In a second aspect of the invention, similar results are obtained by adding hydrocarbyl aromatics to a lubricating oil composition containing one or more of Groups II and III base stock. In a third aspect, the invention concerns a lubricating oil composition comprising an amorphous olefin copolymer and one or more of Groups II and III base stocks. In one embodiment, the third aspect also includes one or more of hydrocarbyl aromatics and polyol esters as part of the composition. In a fourth aspect, moderate concentrations of hydrocarbyl aromatics are used in a lubricating oil composition comprising paraffinic base oil stocks and preferably a borated polyisobutenyl succinimide ashless dispersant.
A method for enhancing the overall fuel economy relative to SAE viscosity grade and reducing the coefficient of friction of a lubricating engine oil in use in an engine at temperatures of 60° C. or higher comprising a base oil which is one or more of a Group II base stock, Group III base stock, wax isomerate base stock and polyalphaolefins base stock by incorporating into said base oil
Dependencies are inferred from the claim text.