| 摘要 |
PURPOSE: New fuel compositions and methods for controlling intake valve deposits and minimizing valve sticking in spark-ignition internal combustion engines are provided. CONSTITUTION: The fuel composition comprises (a) a spark-ignition fuel; (b) a Mannich detergent; and (c) a polybutene having a molecular weight distribution of less than 1.4, wherein the spark-ignition fuel comprises gasoline, wherein the spark-ignition fuel comprises a blend of hydrocarbons of the gasoline boiling range and a fuel-soluble oxygenated compound, wherein the polybutene has a number average molecular weight of from 500 to about 2000, wherein the polybutene is polybutene obtained from a high purity refinery stream, wherein the polybutene is a high-reactivity polyisobutene, and wherein the Mannich detergent comprises the reaction product of at least one alkyl-substituted hydroxy aromatic compound, an aldehyde and at least one amine. |
