| 摘要 |
Catalyst system suitable for the (co)polymerization of ethylene and optionally minor amounts of 1-alkenes and/or dienes at a temperature of at least 180 &loz& C, to be prepared by combining at least five components, which components comprise: 1. one or more titanium compounds 2. one or more vanadium compounds 3. one or more magnesium compounds 4. one or more organoaluminium compounds 5. one or more alkyl, acyl and/or aryl chlorides, or chlorides of elements from groups 3a and 4a of the Periodic System, the atomic ratio of magnesium to the sum of titanium and vanadium being between 0 and 10, the atomic ratio of aluminium to the sum of titanium and vanadium being at least 3, the atomic ratio of aluminim to magnesium being at least 1, and the atomic ratio of chloride to magnesium being at least 2, which components are fed, separately or in combination, direct to the reactor.
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