Ashless or reduced ash quaternary detergents

摘要

A composition of an oil-soluble ionic detergent that does not contribute metal ions to the composition, and which comprises a quaternary non-metallic pnictogen cation and an organic anion having at least one hydrocarbyl group of sufficient length to impart oil solubility to the detergent, the detergent having a total base number (TBN) to total acid number (TAN) ratio of at least 2:1 imparts ash-free basicity to a lubricant composition.

主权项

1. A lubricant composition comprising an oil of lubricating viscosity and an oil-soluble ionic detergent, which detergent comprises
(a) a quaternary ammonium cation and (b) an organic anion having at least one aliphatic hydrocarbyl group of sufficient length to impart oil solubility to the detergent; said oil-soluble ionic detergent having a total base number (TBN) to total acid number (TAN) ratio of at least about 2:1; wherein said oil-soluble ionic detergent exhibits a TBN of at least about 10 arising from a non-metallic base, and wherein said oil-soluble ionic detergent comprises a stoichiometric excess of quaternary ammonium cations of (a) over organic anions of (b) such that said cations and anions are present in an equivalent ratio (a):(b) of at least about 2:1; wherein the cation comprises a pyridinium ion or an imidazolium ion.