C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/403, 402/418
C08F 10/02 (2006.01) C08F 2/34 (2006.01) C08F 4/62 (2006.01) C08F 110/02 (2006.01) C08F 210/16 (2006.01)
Patent
CA 1265893
ABSTRACT OF THE DISCLOSURE Process for the polymerisation of ethylene or the copolymerisation of ethylene and alpha-olefins in a fluidised bed in the presence of a chromium based catalyst The present invention relates to a process for the polymerisation of ethylene or copolymerisation of ethylene and at least one other aplha-olefin, in the gas phase in a fluidised bed reactor, in the presence of a catalyst comprising chromium compounds associated with a granular support comprising a refractory oxide and activated by thermal treatment, which process is characterised in that the catalyst is used in the form of active particles of prepolymer, obtainet by bringing the said catalyst in contact with ethylene, alone, or in a mixture with at least one higher alpha-olefln, in such a way that the prepolymer contains from 4 x 10-5 to 3 milligram atoms of chromium in the catalyst per gram.
490769
Bailly Jean-Claude Andre
Speakman John Gabriel
Bp Chemicals Limited
Fetherstonhaugh & Co.
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