Shell Oil Comapny

Dennis Borisovich Kruchinin

Mark Clift Southby

Nigel Peter Tait

Susan Jane Smith

Jan Elsa Eugenia Carty

The present invention provides a poly(hydroxycarboxylic acid) amide salt derivative having formula (III): [Y&#x2014;CO[O-A-CO]&#x2014;Z&#x2014;R]pX(III) wherein Y is hydrogen or an optionally substituted hydrocarbyl group, A is a divalent optionally substituted hydrocarbyl group, n is from 1 to 100, preferably from 1 to 10, m is from 1 to 4, q is from 1 to 4 and p is an integer such that pq=m, Z is an optionally substituted divalent bridging group which is attached to the carbonyl group through a nitrogen atom, R+ is an ammonium group and Xq&#x2212; is a non-sulphur-containing anion. Furthermore, the present invention provides a lubricating composition and a fuel composition containing the poly(hydroxycarboxylic acid) amide salt derivative and the use of the poly(hydroxycarboxylic acid) amide salt derivative for decreasing the phosphorus volatility of a fluid.

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Ince Chester, United Kingdom

Dennis Borisovich Kruchinin