Societe Nationale Elf Aquitaine

Institut Francais Du Petrole, Des Carburants Et Lubrifiants Et

Elf-union

Entreprise De Recherches Et D'activites Petrolieres (e.r.a.p.)

Institut Francais Du Petrole, Et L'entreprise De Recherches Et

Entreprise De Recherches Et D'activities Petrolieres (e.r.a.p.)

Gilbert Chapelet

Gilbert Marie

Andre Lang

Jean-Pierre Durand

Francois Dawans

Bernard Aubin

Hubert Knoche

Robert Nouguier

Patrice Lubin

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.

Preparation of alkyl or aralkyl thiosulfates

There are disclosed novel lubricating compositions containing a major proportion of a lubricating oil and a minor proportion of an oil soluble polymer additive, and possibly other additives, wherein said polymer additive is a copolymer of ethylene, a monoolefin having 3 to 6 carbon atoms or a monoolefin having 3 to 6 carbon atoms and a non-conjugated diene with one or more specific nitrogenous monomers, said polymer having a reduced viscosity, measured in decalin at 135.degree. C., comprised between 0.5 and 2 and a polydispersity lower than 5. Such a polymer additive improves the oil viscosity index while ensuring the dispersion of the slurry it may contain.

Lubricating compositions with lactam or thiolactam-containing copolymers

Novel amorphous copolymers of mono-olefins or of mono-olefins and non-conjugated dienes with unsaturated derivatives of imides are disclosed. These copolymers containing from 99.9 to 80% by weight of non-polar units derived from at least two mono-olefins containing 2 to 18 carbon atoms, particularly ethylene and propene or ethylene and butene-1, and possibly one or more non-conjugated dienes, and from 0.1 to 20% units derived from an imide having the formula: ##STR1## wherein: Z is an alkenyl radical containing 2 to 16 carbon atoms, and A designates a saturated or unsaturated divalent hydrocarbon radical which contains 2 to 12 carbon atoms and which may possibly carry amino, halogen or carboxyl groups. Also disclosed are graft amorphous copolymers of amorphous copolymers of olefins or of olefins and non-conjugated dienes substrates with unsaturated derivatives of cyclic imides grafted thereon. Some of said copolymers and said graft copolymers may be used as polymer additives in lubricating compounds to improve their viscosity index and to disperse the slurry which they may contain.

Graft copolymers of copolymers of olefins or of olefins and

Novel amorphous copolymers of mono-olefins or of mono-olefins and non-conjugated dienes with unsaturated derivatives of imides, are disclosed. These copolymers containing from 99.9 to 80% by weight of non-polar units derived from at least two mono-olefins containing 2 to 18 carbon atoms, particularly ethylene and propene or ethylene and butene-1, and possibly one or more non-conjugated dienes, and from 0.1 to 20% units derived from an amide having the formula: ##STR1## wherein: Z is an alkenyl radical containing 2 to 16 carbon atoms, and

Lubricating oil compositions containing copolymers of olefins or of

There are disclosed novel lubricating compositions containing a major proportion of a lubricating oil and a minor proportion of an oil soluble polymer additive, and possibly other additives, wherein said polymer additive is a copolymer of ethylene, a monoolefin having 3 to 6 carbon atoms or a monoolefin having 3 to 6 carbon atoms and a non-conjugated diene with one or more specific nitrogenous monomers, said polymer having a reduced viscosity, measured in decalin at 135.degree. C, comprised between 0.5 and 2 and a polydispersity lower than 5. Such a polymer additive improves the oil viscosity index while ensuring the dispersion of the slurry it may contain.

Novel lubricating compositions containing nitrogen containing

Novel amorphous copolymers of mono-olefins or of mono-olefins and non-conjugated dienes with unsaturated derivatives of imides are disclosed. These copolymers containing from 99.9 to 80% by weight of non-polar units derived from at least two mono-olefins containing 2 to 18 carbon atoms, particularly ethylene and propene or ethylene and butene-1, and possibly one or more non-conjugated dienes, and from 0.1 to 20% units derived from an imide having the formula ##STR1## wherein Z is an alkenyl radical containing 2 to 16 carbon atoms, and

Copolymers of olefins or of olefins and non-conjugated dienes with

The behavior in the cold of crude oil or petroleum distillates may be improved by incorporation of polymeric substances such as a hydrogenated polybutadiene or a hydrogenated copolymer of butadiene with at least one conjugated aliphatic diolefin of 5-8 carbon atoms. The additive is active at concentrations of from 10 to 1,000 grams per m.sup.3 of oil.

Growing community of inventors

Bron, France

Gilbert Chapelet