Sulfurised lubricant additives, processes for preparing same and compositions containing said additives.

摘要

Lubricant additives with antiwear and extreme-pressure action, consisting of asymmetric dihydrocarbyl polysulphides containing a hydrocarbyl polysulphide group R-Sx- in a vicinal position to a secondary or tertiary alcohol, and lubricant compositions containing these additives. The additives are prepared by reaction of a basic salt of a hydrocarbyl (poly)sulphide either with a compound containing at least one epoxy group or with an alpha-hydroxylated organic thiosulphate.