| abstract |
The present invention describes amides of formula (I) n R 1 -(C=O)-(NR 2 )-R 3 n wherein nR 1 is a linear or branched, preferably linear C 7 - to C 29 -alkyl, or C 7 - to C 29 -alkenyl, preferably C 7 - to C 23 -alkyl or C 7 - to C 23 -alkenyl nR 2 is hydrogen or C 1 - to C 4 -alkyl, and nR 3 is a hydrocarbyl residue comprising 12 to 200 carbon atoms obtainable from polymerisation of an olefin. n The amides may be used in fuel additive packages or fuels, especially gasoline fuel, as additives for improving the fuel efficiency and/or the fuel economy, for reducing or removing deposits on the intake valves and/or for reducing or removing the fouling of injector nozzles, especially in direct injection spark ignition engines. |