| 摘要 |
The invention provides a gasoline composition comprising a major amount of a gasoline suitable for use in a spark ignition engine; 5 to 1000 ppmw, based on total composition, of a fatty acid salt of an alkoxylated oligoamine of general formula I wherein each moiety A independently represents an alkylene group of 2 to 8 carbon atoms, each moiety R independently represents a C7-23 alkyl or singly or multiply-unsaturated C7 to C23 alkenyl group, optionally substituted by one or more -OH groups, each moiety Z independently represents a C1-8 alkylene group, a C3-8 cycloalkylene group, or a C6-12 arylene or arylalkylene group, m represents 0 or an integer in the range 1 to 5, and the total of all variables x has a value of 50% to 300% of (m+3); and 600 to 2000 ppmw, based on total composition, of a co-additive selected from the group consisting of (a) a nitrogen-containing detergent containing a hydrocarbyl group having a number average molecular weight (Mn) in the range 750 to 6000, (b) a polyalphaolefin having a viscosity at 100° C. in the range 2x10-6 to 2x10-5 m2/s (2 to 20 centistokes), being an oligomer containing 18 to 80 carbon atoms derived from at least one alphaolefinic monomer containing from 8 to 16 carbon atoms; (c) a polyoxyalkylene compound selected from glycols, mono- and diethers thereof, having number average molecular weight (Mn) in the range 400 to 3000; and mixtures of any two or all three of (a), (b) and (c).
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