Compositions d'huiles lubrifiantes améliorées

The invention comprises additive compounds for lubricating oils (see Group III), prepared by phosphosulphurizing a hydrocarbon and reacting the product thus obtained with a C2 to C6 alkylene oxide. In the first stage of the reaction a hydrocarbon is reacted with a mixture of phosphorus and sulphur or a phosphorus sulphide, preferably phosphorus pentasulphide. Specified hydrocarbons are paraffins, olefins, acetylenic hydrocarbons, alkyl-aromatic or cyclo-aliphatic hydrocarbons, petroleum fractions, bright stocks, lubricating oil distillates and waxes. In the second stage the product is condensed with the alkylene oxide at about 285 DEG F. Specified alkylene oxides are ethylene and propylene oxides. In an example a bright stock solvent is treated with phosphorus pentasulphide in a nitrogen atmosphere and the product is either reacted directly with ethylene oxide or treated with an activated earth in a carbon dioxide atmosphere before reaction with ethylene oxide.ALSO:Additives for lubricating oil compositions comprise the products obtained by phosphosulphurizing a hydrocarbon and reacting the product thus obtained with a C2 to C6 alkylene oxide (see Groups IV (a) and IV (b)). They may be incorporated in synthetic, animal, vegetable or mineral lubricating oils, distillates derived from crude paraffin, naphthenic, asphaltic or mixed oils, together with the usual additives. Various tests carried out on lubricating oil compositions containing the additives are described.ALSO:Additive compounds for lubricating oils (see Group III) are prepared by phosphosulphurizing a polyolefin in known manner and reacting the product with a C2 to C6 alkylene oxide. In an example a polyisobutylene having a molecular weight of about 1200 is reacted with phosphorus pentasulphide in an atmosphere of nitrogen and the product is treated with ethylene oxide.