Polysulfide compositions from unsaturated fatty elements and/or (poly)unsaturated esters from acids and from olefins, optionally their preparation and their utilisation as lubricant additives

摘要

Polysulphide compositions of fatty substances or esters of (poly)unsaturated acids obtained by a process which comprises especially: - a stage (1) in which at least one unsaturated fatty substance and/or at least one ester of poly(unsaturated) carboxylic acid is/are reacted in the presence or absence of an aliphatic monoolefin, with at least one compound chosen from sulphur monochloride and dichloride, thus forming an addition product or adduct; - a stage (2) in which hydrogen sulphide and/or a mercapton is/are reacted with an alkali metal hydroxide or ammonium hydroxide in a substantially anhydrous aliphatic monoalcohol; - a stage (3) in which the said adduct and optionally a monohalogenated hydrocarbon compound are brought into contact with the alcoholic solution obtained at the end of stage (2); - a stage (4) in which the monoalcohol is removed by distillation under reduced pressure. These compositions are employed as additives for inorganic or synthetic lubricants.