| 摘要 |
A quaternary ammonium salt of a diester which can be represented by the formula: in which Ri, Rii, Riii, Riv, Rv and Rvi represent hydrogen, alkyl or alkenyl radicals at least one of which is a hydrocarbyl radical having from 50-200 carbon atoms, R is a divalent radical having from 2-10 carbon, or carbon and oxygen atoms, Rvii is hydrogen or a hydrocarbyl radical, ? has a value from 0-4 and X is an anion is provided, as well as a method of preparation and a hydrocarbon lubricating oil composition containing same. |
