| 摘要 |
AE 5438 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.degree.C, to be prepared by combining at least two components A and B, which components comprise: A : one or more titanium compounds, one or more vanadium com pounds, one or more aluminium compounds, one or more magnesium compounds and optionally one or more halogen compounds, in such amounts that the atomic ratio of magnesium to the sum of titanium and vanadium is between 0 and 10, the atomic ratio of aluminium to the sum of titanium and vanadium is at least 3, the atomic ratio of aluminium to magnesium is at least 1, and the atomic ratio of halogen to magnesium is at least 2, B : one or more organoaluminium compounds, which two components are, separately or in combination, supplied direct to the polymerization vessel. |
