| 摘要 |
A process for polymerizing ethylene in the presence of a catalyst system comprising at least two halogen compounds of transition metals, one of which has the formula (TiCl3,Y3 AlCl3)(MY3)x(MgYZ)y, where M is a transition metal of Group VB or V1B, X is a halogen and 0.3</=x</=3, 0</=y</=20, and a Group I to III hydryde or organometallic activator and the mean residence time of the catalyst system in the polymerization reactor is between 2 and 100 seconds.
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