IMPROVED DISPERSANT VISCOSITY MOFIDIERS

摘要

The invention provides a dispersant viscosity modifier, and more specifically a metal free dispersant viscosity modifier. The invention provides compositions, including lubricating compositions containing the described dispersant viscosity modifier, such as heavy duty diesel lubricating compositions. The invention further relates to the use of the described dispersant viscosity modifier to improve the film thickness and/or antiwear performance of a lubricating composition, for example, a heavy duty diesel lubricating composition. The improved dispersant viscosity modifier of the invention is specially designed to protect against valve train and other crankcase wear in lubricating applications, including heavy soot conditions such as heavy duty diesel lubricating applications.

主权项

1. A composition comprising a dispersant viscosity modifier comprising an olefin-based polymer and one or more functional groups each independently attached to the olefin-based polymer,
where the functional group comprises a linking group grafted onto the olefin-based polymer and an alpha-hydroxy or alpha-alkoxy carboxy group connected to the linking group.