| 摘要 |
Catalyst system for the homopolymerization of ethylene or copolymerization of ethylene with one or more alpha -olefins with 3-12 carbon atoms and optionally one or more non-conjugated dienes in solution, this catalyst system comprising a catalyst A and a cocatalyst B, of which catalyst A can be obtained by reaction under inert conditions of the following components: (a) one or more organomagnesium compounds with alkyl and/or alkoxy groups bonded to the magnesium, (b) one or more chlorine-containing organoaluminium compounds and/or boron compounds, (c) one or more oxygen-containing compounds, (d) one or more transition metal compounds with alkyl, alkoxy and/or halogenide groups bonded to the transition metal; in the order (a), (b), (c), (d), or (a), (b), (d), (c), or (a), (b) and a reaction product of (c) and (d) = (e); following which catalyst A is washed and used in such a quantity that the atomic ratio of aluminium or boron of (b) to magnesium of (a) is between 2 and 15, the atomic ratio of magnesium of (a) to transition metal from (d) or (e) is between 3 and 100, the atomic ratio of oxygen from (c) or (e) to the magnesium of (a) is between 0.1 and 5; as cocatalyst B one or more organoaluminium compounds and/or boron compounds can be used. |
