The present disclosure relates to viscosity index modifiers that have dispersant properties and lubricating oil compositions comprising said viscosity index modifiers. The viscosity index modifier is the reaction product of an acylated olefin copolymer, a polyamine, and a dicarboxylic acid or anhydride thereof that can react with a free primary amine of the polyamine to form a ring moiety. The disclosure also relates to the use of lubricant compositions comprising the viscosity index improvers of the disclosure for improving the soot or sludge handling characteristics of an engine lubricant composition, while minimizing the deterioration of engine seals.
本公开涉及具有分散剂特性的粘度指数调节剂和包含所述粘度指数调节剂的润滑油组合物。粘度指数调节剂是酰化烯烃共聚物、
多胺和二
羧酸或其酸酐的反应产物,可与
多胺的游离
伯胺反应形成环状分子。本公开还涉及使用包含本公开所述粘度指数改进剂的润滑油组合物来改善发动机润滑油组合物的烟尘或油泥处理特性,同时最大程度地降低发动机密封件的劣化程度。