GASOLINE COMPOSITIONS

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.