Afton Chemical Corporation

Dsm IP Assets B.v.

Cathy C Devlin

Charles A Passut

Joe S Bradley

Errol J Olivier

Abbas Kadkhodayan

Sanjay Srinivasan

Johannes Hendrik Geesink

Paul G Griffin

David A Hutchison

Patric Meessen

Yoon Soo Song

Ju-Fu Shiau

Michael A Danylo

Joseph S Bradley

Zhaoyao Joe Qiu

Gerardus Arnoldus Rademakers

Gerhard Van Vliet

Errol Joseph Olivier

A method for maintaining a total base number (TBN) above about 3 mg KOH/g for a lubricant for a diesel engine for greater than about 184 days. The method includes supplying as the lubricant, a lubricant composition comprising a sulfonate detergent having a TBN ranging from about 20 to about 100 and a phenate detergent having a TBN ranging from about 200 to about 350 and an antioxidant selected from the group consisting essentially of hindered phenolic derivatives of Cto Cacids and Cto Cesters of hindered phenolic derivatives of Cto Cacids. The phenate detergent is present in an amount that is greater than 15 percent by weight of the total weight of detergents in the lubricant composition and the lubricant composition is substantially devoid of zinc dialkydithiophosphate compounds and has a sulfated ash content of less than 1.0 wt. %.

Extended drain diesel lubricant formulations

Lubricating oil compositions are provided that inhibit coolant-induced oil filter plugging in heavy-duty diesel engines, and particularly CJ-4 and CI-4 PLUS compliant lubricating oil compositions that inhibit coolant-induced oil filter plugging in exhaust gas recirculation or recycle engines.

Lubricating oil compositions for inhibiting coolant-induced oil filter plugging

This invention relates to detergents, lubricating oil additives and compositions, and methods of preparing detergents, lubricating oil additives and compositions. More specifically, this invention relates to novel phenolic dimers.

Phenolic dimers, the process of preparing same and the use thereof

A novel highly grafted, multi-functional olefin copolymer is provided comprising an additive reaction product of a method comprising reacting acylating agent with an olefin copolymer having a number average molecular weight greater than about 1,000 in the presence of a free radical initiator and essentially free of hydrocarbon solvent in an extruder to provide an olefin copolymer intermediate comprising an acylated olefin copolymer having a degree of grafting (DOG) of at least 0.5 wt. %, which copolymer intermediate's molecular weight is reduced, vacuum stripped of unreacted components, pelletized, dissolved in a neutral oil (preferably with inert gas sparging), and further reacted with a polyamine to provide a grafted multi-functional olefin copolymer viscosity modifier, and lubricating oil concentrates and compositions containing the same and uses thereof.

Grafted multi-functional olefin copolymer VI modifiers and uses thereof

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Richmond, VA, United States of America

Cathy C Devlin