LUBRICATING OIL COMPOSITIONS WITH IMPROVED FRICTION PROPERTIES

摘要

The present invention concerns frictions 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 mor e 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 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 ome embodimen t, the third aspect also includes one or more of hydrocarbyl aromatics and poly ol esters as part of the composition. In a forth aspect, moderate concentration s of hydrocarbyl aromatics are used in a lubricating oil composition comprisin g paraffinic base oil stocks and preferably a borated polyisobutenyl succinimi de ashless dispersant.