Lubricating compositions with lactam or thiolactam-containing copolymers

US4170561A · kind A · utility

Assignee

• Entreprise de Recherches et d'Activities Petrolieres (E.R.A.P.) · FR

Inventors

• Gilbert Chapelet · Bron, FR
• Hubert Knoche · Meyzieu, FR
• Gilbert Marie · Pau, FR

Key dates

• Filing date: Mar 15, 1978
• Grant date: Oct 9, 1979
• Expiry date: Mar 15, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2070/02
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

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.