Dispersant-viscosity improvers for lubricating oil compositions

Details Dispersant-viscosity improvers for lubricating oil compositions Dispersant-viscosity improvers for lubricating oil compositions

C - Chemistry, Metallurgy

08

F

C08F 255/06 (2006.01) C08F 220/56 (2006.01) C08F 226/06 (2006.01) C08F 287/00 (2006.01) C08F 291/00 (2006.01) C10M 143/00 (2006.01) C10M 149/06 (2006.01) C10M 149/10 (2006.01)

Patent

CA 2362034

Graft copolymers useful as a dispersant-viscosity improver for lubricating oil compositions comprise a hydrocarbon polymer having graft polymerized thereon at least two nitrogen containing units, at least one of the nitrogen containing units being derived from at least one of a neutral N-(lower hydrocarbyl group)- (meth)acrylamide and a neutral N,N-di-(lower hydrocarbyl group)- (meth)acrylamide, wherein the total number of carbon atoms in the lower hydrocarbyl groups does not exceed 9, and at least one of the nitrogen containing units being derived from at least one vinylic nitrogen containing heterocyclic compound.

Des copolymères greffés utilisés comme améliorant de viscosité dispersante pour des compositions d'huiles de lubrification comprennent un hydrocarbure polymérique contenant une greffe polymérisée, au moins deux unités contenant de l'azote. Au moins une de ces unités est dérivée à partir au moins d'un N-(groupe hydrocarbyle inférieur)- (méth)acrylamide neutre et d'un N,N-di-( groupe hydrocarbyle inférieur)- (méth)acrylamide neutre, où le nombre total d'atomes de carbone dans les groupes hydrocarbyles inférieurs n'excède pas 9, et au moins une de ces unités est dérivée à partir d'au moins un azote vinylique renfermant un composé hétérocyclique.

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