Process for preparing star polymer compositions

Details Process for preparing star polymer compositions Process for preparing star polymer compositions

C - Chemistry, Metallurgy

08

F

C08F 8/32 (2006.01) C10M 145/14 (2006.01) C10M 149/02 (2006.01) C10M 149/06 (2006.01)

Patent

CA 2207611

The present invention provides a process for preparing nitrogen-containing star polymer compositions having polymeric arms of a hydrogenated conjugated diene and substantially smaller polymeric arms of an alkyl methacrylate which are efficiently reacted with amines after preparation of a concentrate of the polymer in a lubricating oil to form a dispersant viscosity index improver.

La présente invention se rapporte à un procédé de préparation de compositions polymères à structure en étoile, contenant de l'azote, et présentant des branches polymères d'un diène conjugué et hydrogéné, et des branches polymères sensiblement plus petites d'un méthacrylate d'alkyle, ces polymères à structure en étoile étant efficacement amenés à réagir avec des amines après la préparation d'un concentré du polymère dans une huile lubrifiante de sorte qu'ils forment un additif d'indice de viscosité dispersant.

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