Dispersants and lubricating oil compositions containing same
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United States of America Patent
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Jun 1, 2004
Grant Date -
Aug 7, 2003
app pub date -
Dec 6, 2001
filing date -
Dec 6, 2001
priority date (Note) -
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Abstract
A dispersant that is a reaction product of a polyalkenyl-substituted mono-or dicarboxylic acid, anhydride or ester; and a polyamine, wherein the reaction product has from greater than about 1.3 to less than about 1.7 mono- or di-carboxylic acid producing moieties per polyalkenyl moiety, and the polyalkenyl moiety has a number average molecular weight of at least about 1800, and a molecular weight distribution (M.sub.w /M.sub.n) of from about 1.5 to about 2.0.
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