C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
C10M 143/12 (2006.01) C08F 297/04 (2006.01) C08L 53/02 (2006.01) C10M 143/10 (2006.01)
Patent
CA 2321006
Star polymers which can be used as viscosity index improvers in oil compositions formulated for high performance engines. The star polymers have tetrablock copolymer arms of hydrogenated polyisoprene- polybutadiene-polyisoprene with a block of polystyrene and which provide excellent low temperature performance in lubricating oils, exhibit good thickening efficiency, and are finishable as polymer crumb.
L'invention porte sur des polymères étoilés pouvant servir à augmenter l'indice de viscosité d'huiles pour moteurs à hautes performances. Lesdits polymères, qui comportent des bras de polymère tétrabloc (de polyisoprène-polybutadiène-polyisoprène hydrogénés) et un bloc de polystyrène, confèrent aux huiles de graissage d'excellentes performances à basse température, ont un bon pouvoir épaississeur, et peuvent être fournis comme produits finis sous forme de poudre.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Shell Internationale Research Maatschappij B.v.
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