Composição de gasolina e concentrado de aditivo para gasolina

摘要

The invention provides gasoline compositions and gasoline additive concentrates containing an additive, useful in reducing intake valve deposits, obtained by reacting at least one amine, with a polyalkenyl derivative of a monoethylenically unsaturated C4-C10 dicarboxylic acid material in which the ratio of dicarboxylic acid moieties per polyalkenyl chain is not greater than 1.2:1 and the number average molecular weight (Mn) of the polyalkenyl chain is in the range from 1600 to 5000.