Dispersant additive
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United States of America Patent
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Jul 3, 2001
Grant Date -
N/A
app pub date -
Nov 2, 1999
filing date -
Nov 4, 1998
priority date (Note) -
Expired
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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.
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