Fuel compositions containing a polyisobutene succinimide detergent

摘要

A fuel composition which comprises a major amount of a liquid hydrocarbon fuel and, in an amount to provide detergency, a polyisobutene (PIB) succinimide derived from the reaction of a polyisobutene - substituted succinic acylating agent and an amine having at least one reactive hydrogen bonded to an amine nitrogen is characterised in that the polyisobutene - substituted succinic acylating agent is obtained by a thermal route and the polyisobutene substituent is derived from a highly reactive polyisobutene ie having a high proportion of vinylidene groups -CH2CMe=CH2. The PIB-substituted succinic acylating agent is preferably obtained by the thermal reaction of the highly reactive polyisobutene with a succinic acylating agent eg maleic anhydride.