DISPERSANTS FOR LUBRICATING OIL COMPOSITIONS

A lubricating oil composition comprises a major amount of an oil of lubricating viscosity and a minor amount of an unsymmetrical bis-succinimide, or a mixture of unsymmetrical bis-succinimides, of thestructure (I):One of R1and R2is a polyisobutylene group having a weight average molecular weight of 400 to 5,000, as determined by GPC with reference to linear polystyrene standards, and the other ofR1and R2is a hydrocarbon group made by the metallocene-catalysed polymerisation of an alpha-olefin feedstock. Value x is from 1 to 10 and is the same for all molecules of structure (I) or an averageof all molecules of structure (I) in a mixture of molecules of structure (I). 一种润滑油组合物包含主要量的具有润滑粘度的油和次要量的结构(I)的不对称双琥珀酰亚胺或不对称双琥珀酰亚胺的混合物：其中R和R之一是具有400至5,000的重均分子量的聚异丁烯基团，分子量通过以线性聚苯乙烯标样为参比的GPC测定，且R和R的另一个是通过茂金属催化的α-烯烃原料的聚合制成的烃基；且x是1至10并且对于所有结构(I)分子是相同的或者是结构(I)分子的混合物中的所有结构(I)分子的平均值。