| 摘要 |
Concentrates for lubricating oil compositions are prepared by blending at elevated temperature:(A) at least one high molecular weight ashless dispersant; and(B) at least one oil-soluble metal detergent; in the presence of(C) at least one metal salt of a dihydrocarbylphosphorodithoic acid wherein the metal of the metal salt is an alkali metal, an alkaline earth metal, or zinc, aluminium, lead, tin, molybdenum, manganese, nickel or copper. |
