| abstract |
The invention relates to an additive containing phosphorus and sulfur as well as to its use which confers antiwear properties on oily compositions such as fuels and lubricating oils, in particular compositions for gearboxes, such as fluids for automatic transmission. . Said additive comprises a mixture of products formed, for example, by the simultaneous reaction (1) of a beta-hydroxy thioether such as a thiobisethanol, (2) of a reagent containing phosphorus such as triethyl phosphite and (3) optionally a nucleophilic reagent capable of reacting with the episulfonium cation of formula (I), to form thioether species. |