| abstract |
(a) an aromatic ester compound of the formula or a fuel soluble salt thereof:n n n (I)n n n Wherein R is hydroxy, nitro or-(CH 2 ) x -NR 5 R 6 , wherein R 5 and R 6 are independently hydrogen or lower alkyl having 1 to 6 carbon atoms and x is 0 or 1 ; R 1 is hydrogen, hydroxy, nitro or —NR 7 R 8 wherein R 7 and R 8 are independently hydrogen or lower alkyl having 1 to 6 carbon atoms; R 2 and R 3 are independently hydrogen or lower alkyl having 1 to 6 carbon atoms; R 4 is a polyalkyl group having an average molecular weight of about 450 to about 5,000; (b) a poly (oxyalkylene) amine having at least one base nitrogen atom and a sufficient number of oxyalkylene units to produce poly (oxyalkylene) amines that are soluble in the boiling range hydrocarbons of gasoline or diesel fuel. A fuel additive composition comprising.n n n The fuel additive composition of the present invention is useful as a fuel additive for preventing or controlling engine deposits. |