ABSTRACT
The alkenyl-succinic anhydride based ashless dispersant additives were successfully used in formulation of motor oils. One of the main fields of this additive type has been the optimization of the structure. Structure modifications were generally carried out by empirical methods because there were Nitric oxide exact correlations between the additive characteristics and the performance test results. The polyolefins, the alkenyl-succinic anhydrides and the final products were identified and evaluated by standard test methods or by methods described in the literature. The molecular mass of the polymers was limited by the solubility in oils of the final products. The mono-succinimide with polypropylene side-chain showed much lower stability then the polyethylene- and polyisobuthylene-succinimides. In the case of oils containing polyisobutenyl-succinimides and polyisobutenyl-succinic-ester-amide test panels did not show significant differences of the deposit blocking efficiency. Washing efficiency of the additive package in motor oils was measured before and after the coking test.
