| 摘要 |
A quaternary ammonium salt of a diester represented by the formula: <IMAGE> in which Ri, Rii, Riii and Riv 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, Rv is hydrogen or a hydrocarbyl radical, z 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.
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