Alkenyl succinimides with different alkyl chain lengths have been synthesized. Alkenyl succinim ide samples based on polyisobutylene with molecular weights of 1000 and 1300 have displayed the best func tional properties. By differential thermal analysis, it has been shown that these samples have high thermal sta bility and do not decompose at temperatures of about 300°C. Two representative samples of polyalkenyl suc cinimides in the composition of blended gasoline have been subjected to bench testing in a full sized engine. A significant reduction in deposits on the engine intake valves has been noted upon testing the fuel in the pres ence of the synthesized samples with a concentration of 0.05 wt %.
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