Patent ID: 8486876

Claim:
A functional fluid suitable for use in an internal combustion engine, comprising: (a) a major amount of a base fluid; (b) a minor amount of a polysubstituted alkanol amine derivative reaction product produced by a process reacting: (i) a carboxylate compound of formula I R 1 COOR 2 (I) in which: R 1 is an aliphatic C 1-30 -hydrocarbon radical; and R 2 is hydrogen or alkyl, mono- or polyhydroxyalkyl, or ammonium; with (ii) an alkanol amine of the formula II NHR 3 R 4 (II) wherein R 3 and R 4 are independently selected from hydrogen atoms and linear or branched-chain hydrocarbon groups, the carbon chain of which is optionally interrupted by one or more —NH— groups and which optionally has at least one hydroxyl group attached to a carbon atom of the hydrocarbon group, with the proviso that R 3 and R 4 are not both hydrogen atoms and that at least one of said residues R 3 and R 4 carries at least one hydroxyl group; wherein said process comprises a molar ratio of the —COO— groups of the carboxylate compound of formula I to the molar sum of —OH and —NH— groups of the alkanol amine of formula II in a range and under at least one reaction condition effective to form the reaction product comprising polysubstituted alkanol amine derivatives; and (c) a minor amount of a detergent additive.