Elf France

Elf-union

Robert Nouguier

Paul Maldonado

Laurent Germanaud

Robert Leger

Jean-Claude Fayard

Gilbert Chapelet

Christian Bernasconi

Michel Llinares

Patrice Lubin

Lubricating oil additives are provided which have extreme pressure, antiwear and antioxidant properties. The additives are dithiophosphorous disymmetric bisulphides of the formula: ##STR1## wherein X and Y represent an oxygen or sulphur atom or a methylene group and R.sub.1 and R.sub.2 and R.sub.3 represent a hydrocarbon radical, a polyether, a polythioether or a hydrogen atom. The invention also relates to a process for their preparation and to lubricating compositions containing the additives.

Additives to lubricating oils having extreme pressure, antiwear and

The present invention concerns a process for the formation of homogeneous fuel compositions containing a petroleum cut and at least one short chain aliphatic alcohol, essentially methanol, ethanol and the butanols, through dilution with an additive constituted by a C.sub.6 to C.sub.24 glycerol monoether.

Process for the formation of homogeneous fuel compositions containing a

Ethers of polyols are prepared by reaction of a polyol and an organic chloride in a two phase medium in the presence of a phase transfer catalyst. The ethers of polyols are useful as synthetic lubricants, as lubricant bases, as lubricant additives and as fuel additives.

Ethers of polyols, their preparation and use

Process for obtaining alkyl- and arylalkylthiosulfates in a water-organic solvent two-phase system by nucleophilic substitution of the halogen of an alkyl or arylalkyl halide by a thiosulfate ion, characterized by the fact that the substitution is effected in the presence of a phase transfer agent acting as a catalyst and used in catalytic proportions.

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Plan de Cuques, France

Robert Nouguier