| abstract |
A composition including an ionic liquid alkylammonium salt (e.g., tetraalkylammonium cation and bis(2-ethylhexyl)phosphate anion), or an ionic liquid imidazolium salt (e.g., 1,3-dialkylimidazolium cation and bis(2-ethylhexyl)phosphate anion), that have a structure sufficient to exhibit at least partial solubility in one or more Group I-V base stocks. The disclosure also relates to a lubricating oil base stock and lubricating oil containing the composition, a multifunctional functional fluid containing the composition, and a method for improving solubility of an ionic liquid in a lubricating oil by using as the lubricating oil a formulated oil including a lubricating oil base stock as a major component, and an ionic liquid alkylammonium salt cobase stock, or an ionic liquid imidazolium salt cobase stock, as a minor component. |