Abstract
This article reports on the synthesis of analogs of urea succinimide (USI), starting with chemically pure compounds. The structure of these synthesized materials is compared with that of components of the commercial additive, using chemical and physicochemical methods of analysis. The starting materials were USI additive, dodecenylsuccinic anhydride, and urea. Under conditions similar to those in the commercial synthesis of USI, the reaction of dodecenylsuccinic anhydride with urea gives a hydrocarbon-soluble dark brown, viscous product and an infusible residue that is insoluble in water or hydrocarbons, representing products of urea condensation. The reaction of the anhydride with urea, even at 145-160/sup 0/C, leads to breakdown of the urea, and only the one nitrogen atom enters into the final product. Includes a table.
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