Shell Oil Comapny

Hendrik Tijmen Verkouw

Michael T Clark

Indu Sawhney

Polyolefin-substituted dicarboxylic ester derivatives, having an ester group derived from a polyether polyol and process for making such; wherein the ester derivatives are useful additives in lubricating oil compositions and concentrates thereof.

Polyolefin-substituted dicarboxylic derivatives

The invention provides alkenyl-substituted dicarboxylic derivatives, having (a) an alkenyl group derived from an atactic propylene oligomer substantially of the formula ##STR1## where n is in the range 15 to 120, having number average molecular weight (M.sub.n) in the range 700 to 5000, and molar ratio dicarboxylic moieties to atactic propylene oligomer in the range 1:1 to 1.5:1; and having (b) an ester group derived from a polyol, which are useful as dispersant additives; a process for making the ester derivatives, additive concentrates containing such ester derivatives, and lubricating oil compositions.

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Sittingbourne, United Kingdom

Hendrik Tijmen Verkouw