| abstract |
The present invention is directed to a fuel additive including the reaction product of a mixture of (1) a polymer prepared from ethylene, at least one C3 to C1O alpha-monoolefin and a polyene selected from non-conjugated dienes and trienes comprising from about 15 to 80 mole percent of ethylene from about 20 to 85 mole percent of said C3 to C1O alpha-monoolefin and from about 0 to 15 mole percent of said polyene and having an average molecular weight ranging from about 5,000 to 30,000, (2) at least one olefinic carboxylic acid acylating agent, and (3) an N-arylphenylenediamine represented by the formula (I) in which R1 is hydrogen, -NH-aryl, -NH-arylalkyl, a branched or straight chain radical having from 4 to 24 carbon atoms that can be alkyl, alkenyl, alkoxyl, aralkyl, alkaryl, hydroxyalkyl or aminoalkyl, R2 is -NH¿2?, -CH2-(CH2)n-NH2, -CH2-aryl-NH2 in which n has a value from 1 to 10 and R?3¿ is hydrogen, alkyl, alkenyl, alkoxyl, aralkyl, or alkaryl radical having 4 to 24 carbon atoms. |