Process for the start up of polymerisation or...

Details Process for the start up of polymerisation or... Process for the start up of polymerisation or...

C - Chemistry, Metallurgy

08

F

402/613

C08F 2/34 (2006.01) C08F 4/62 (2006.01) C08F 10/00 (2006.01)

Patent

CA 1265646

ABSTRACT OF THE DISCLOSURE PROCESS FOR THE START UP OF POLYMERISATION OR COPOLYMERISATION IN THE GAS PHASE OF ALPHA-OLEFINS IN THE PRESENCE OF A ZIEGLER-NATTA CATALYST SYSTEM The present invention relates to a process for the start up of polymerisation or copolymerisation in the gas phase by bringing the said alpha-olefins in contact under polymerisation or copolymerisation conditions in a fluidised bed and/or with mechanical stirring with a charge powder, in the presence of a catalyst system of the Ziegler-Natta type, this process being characterised in that the charge powder used is previously dehydrated and subjected to a treatment by bringing the said charge powder into contact with an organoaluminum compound for a period of at least five minutes, so that the polymerisation or copolymerisation starts up immediately after the contracting of the alpha-olefins with the charge powder in the presence of the catalyst system.

493589

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