Lubricating oil additives

摘要

A process is disclosed which comprises reacting at elevated temperature (a) a copolymer of an olefin and a monomer having the structure wherein X and X<1> are the same or different provided that at least one of X and X<1> is such that the copolymer can function as a carboxylic acylating agent and (b) a succinimide prepared from an acyclic hydrocarbyl substituted succinic acylating agent and a polyamine wherein the hydrocarbyl substituted succinic acylating agent is prepared by reacting a polyolefin and an acylating agent of formula I under conditions such that at least 75 mole % of the starting polyolefin is converted to the hydrocarbyl-substituted succinic acylating agent. Hydrocarbyl substituted succinic acylating agents derived from high reactivity PIB's are preferred.