C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/613, 117/47.
C08F 110/02 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01)
Patent
CA 1209745
SUMMARY The present invention relates to a process for polymerising or copolymerising alpha-olefins comprising, on the one hand, a prepolymerisation stage by contacting one or more alpha-olefins with a Ziegler catalyst system consisting of a solid catalyst containing essentially atoms of halogen, magnesium and transition metal, and a co-catalyst consisting of an organomatellic compound, and, on the other hand, a polymerisation or copolymerisa- tion stage in a gas phase process by means of a fluidised bed, by contacting one or more alpha-olefins with the prepolymer produced in the first stage, process characte- rised in that the alpha-olefin prepolymer and polymer or copolymer are in the form of a pouwder consisting of particules having specific values for the transition metal content and the mean diameter by mass, and charac- terised in that the particle size distribution of the prepolymer is narrow and easily controlled.
431031
Bailly Jean C.
Blaya Alain
Crouzet Pierre
Havas Laszlo
Sandis Stylianos
Bp Chimie Societe Anonyme
Smart & Biggar
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