Hydrogenated star-shaped polymer

Chemistry of carbon compounds – Miscellaneous organic carbon compounds

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C08K 501

Patent

active

041566734

ABSTRACT:
A viscosity index-improver for lubricating oil compositions is disclosed. This viscosity index improver is a hydrogenated star-shaped polymer comprising a poly(poly-alkenyl coupling agent) nucleus and at least four polymeric arms linked to the nucleus wherein the arms are hydrogenated homopolymers and copolymers of conjugated dienes, hydrogenated copolymers of conjugated dienes and monoalkenyl arenes, or mixtures thereof.

REFERENCES:
patent: 3668125 (1972-06-01), Anderson
patent: 3700633 (1972-10-01), Wald
patent: 3700748 (1972-10-01), Winkler
patent: 3823203 (1974-07-01), De La Mare
patent: 3827999 (1974-08-01), Crossland
patent: 3985830 (1976-10-01), Fetters

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