Afton Chemical Corporation

Dsm IP Assets B.v.

Joseph S Bradley

Sanjay Srinivasan

Sheng Jiang

Charles A Passut

Cathy C Devlin

Yoon Soo Song

Anthony Fagan

Patric Meessen

Zhaoyao Joe Qiu

Gerardus Arnoldus Rademakers

Michael A Danylo

Yoon S Song

Errol Joseph Olivier

Gerhard Van Vliet

Johannes Hendrik Geesink

The present disclosure relates to viscosity index modifiers that have dispersant properties and lubricating oil compositions comprising said viscosity index modifiers. The viscosity index modifier is the reaction product of an acylated olefin copolymer, a polyamine, and a dicarboxylic acid or anhydride thereof that can react with a free primary amine of the polyamine to form a ring moiety. The disclosure also relates to the use of lubricant compositions comprising the viscosity index improvers of the disclosure for improving the soot or sludge handling characteristics of an engine lubricant composition, while minimizing the deterioration of engine seals.

Grafted polymer with soot handling properties

A novel highly grafted, functionalized olefin polymer is provided comprising the reaction product of a method comprising reacting an acylating agent with a mixture comprising an olefin polymer having a number average molecular weight of between about 5,000 to about 100,000 and a diluent in the presence of a free radical initiator to provide an acylated olefin polymer which is further reacted with a polyamine to provide the grafted functionalized olefin polymer dispersant. Lubricating oil concentrates and compositions containing the highly grafted, functionalized olefin polymer and uses thereof also are provided.

Graft functionalized olefin polymer dispersant and uses thereof

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Midlothian, VA, United States of America

Joseph S Bradley