Patent Number: 6,255,258

Title: Dispersant additive

Abstract: An oil-soluble dispersant obtainable by reacting the reaction product of a polyamine and a long-chain hydrocarbyl-substituted dicarboxylic acid, anhydride or ester thereof with a polyanhydride, characterized in that the dispersant restricts the viscosity increase in an oil to below 8 Pa.s in the Haake rheology test defined herein at 2% w/w active matter and a shear rate of 0.26 s.sup.-1 Pa.s, and lubricating oil and fuel compositions and additive concentrates containing such a dispersant.

Inventors: Clark; Michael T. (Oxford, GB), Warren; Graham A. (Liverpool, GB)

Assignee: Infineum USA L.P.

International Classification: C10M 133/52 (20060101); C10M 133/00 (20060101); C10M 133/56 (20060101); C10M 133/16 (20060101); C10M 133/16 (); C10M 133/56 (); C07D 207/412 ()

Expiration Date: 07/03/2018