Conjugated diene polymerisation

Details Conjugated diene polymerisation Conjugated diene polymerisation

C - Chemistry, Metallurgy

08

F

C08F 36/04 (2006.01) C08F 4/52 (2006.01)

Patent

CA 2116330

A process for the polymerisation of one or more conjugated dienes by means of a rare earth based catalyst in which the ca- talyst is formed by bringing together in liquid hydrocarbon medium in the presence of a small portion of conjugated diene: a) a rare earth salt, b) an organo aluminium and c) a silicon halide or organosilicon halide and aging the catalyst before contact with the conjugated diene(s) to be polymerised. This catalyst formation procedure offers the possibility of producing a diene polymer of high cis content with a narrower molecular weight distribution and/or smaller high molecular weight fraction which is reflect ed in improved processing characteristics and reduced viscosity in styrene.

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