Process for starting up the polymerisation of ethylene or...

Details Process for starting up the polymerisation of ethylene or... Process for starting up the polymerisation of ethylene or...

C - Chemistry, Metallurgy

08

F

402/613

C08F 2/34 (2006.01) C08F 10/00 (2006.01)

Patent

CA 1265894

ABSTRACT OF THE DISCLOSURE PROCESS FOR STARTING UP THE POLYMERISATION OF ETHYLENE OR COPOLYMERISATION OF ETHYLENE AND AT LEAST ONE OTHER ALPHA-OLEFIN IN THE GAS PHASE IN THE PRESENCE OF A CATALYST BASED ON CHROMIUM OXIDE The present invention relates to a process for starting up the polymerisation of ethylene or copolymerisation of ethylene and at least one other alpha-olefin by bringing ethylene and optionally at least one other alpha-olefin in contact under fluidised-bed polymerisation or copolymerisation conditions and/or stirred mechanically, with a charge powder in the presence of a catalyst comprising a chromium oxide compound associated with a granular support and activated by thermal treatment, this catalyst being used in the form of a prepolymer, this process being characterised in that the charge powder employed is previously subjected to a treatment by contacting the said charge powder with an organo-aluminium compound, in such a way that the polymerisation or copolymerisation starts up immediately after the contacting of the ethylene and optionally one other alpha-olefin with the charge powder in the presence of the prepolymer.

493584

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