| 摘要 |
<p>A fuel additive composition comprising: a) a Mannich condensation product of (1) a high molecular weight alkyl-substituted hydroxyaromatic compound wherein the alkyl group has a number average molecular weight of from about 300 to about 5,000 (2) an amine which contains an amino group having at least one active hydrogen atom, and (3) an aldehyde, wherein the respective molar ratio of reactants (1), (2), and (3) is 1:0.1-10:0.1-10; b) a hydrocarbyl-terminated poly(oxyalkylene) monool having an average molecular weight of about 500 to about 5,000, wherein the oxyalkylene group is a C2 to C5 oxyalkylene group and the hydrocarbyl group is a C1 to C30 hydrocarbyl group; c) a polyolefin polymer of a C2 to C6 mono-olefin, wherein the polymer has a number average molecular weight of about 500 to about 3,000; and d) a carboxylic acid as represented by the formula: R3(COOH)f or anhydride thereof, wherein R3 represents a hydrocarbyl group having about 2 to about 50 carbon atoms, and f represents an integer of 1 to about 4. The unique fuel additive composition of the present invention provides excellent control of engine deposits, particularly engine intake system deposits, such as intake valve deposits.</p> |
