| 摘要 |
An improved process for preparing oil-soluble derivaties of unsaturated C4-C10 dicarboxylic acid materials, e.g. the product of the reaction of polyisobutylene and maleic anhydride, under Ene reaction conditions characterized in that said Ene reaction is conducted under acidic conditions as by conducting said reaction in the presence of from 0.01 to 5 wt. %, based on total weight of the reactants, of an oil-soluble strong organic acid containing a hydrogen dissociating moiety which has a pK of less than about 4.0, as exemplified by C15 to C76 hydrocarbyl-substituted sulfonic acid, whereby sediment resulting from said Ene reaction is markedly reduced to less than 1 wt. %. |
