| 摘要 |
A catalytic component for polymerizing olefins comprises a solid support containing magnesium-halogen or manganese-halogen bonds, a transition metal halide of a metal selected from Groups IVB and VB of the periodic table, and electron donors. This catalytic component is obtainable by steps comprising: (a) contacting a mixture comprising a magnesium halide or manganese halide and at least one electron donor with a Ti(OR)4 compound to form a solution, where R is a hydrocarbyl or halogenated hydrocarbyl moiety containing 1 to 20 carbon atoms or a halogen, and (b) reacting the solution with a reagent comprising a transition metal halide selected from Groups IVB and VB of the periodic table, whereby, with a suitable cocatalyst, polyolefin is formed with high activity, showing a high Isotactic Index, and with a narrow range of particle size distribution.
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