| 摘要 |
<p>An unmilled catalytic component for polymerizing olefins with high activity to yield polymers with high stereoregularity and a narrow particle size distribution with a low weight percentage of small particles comprises a solid, unmilled support containing magnesium-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 obtained by steps comprising: (a) contacting a Mg(OR)2 and/or Mn(OR)2 compound with a Ti(OR)4 compound to comprise a liquid, where R is a hydrocarbyl or halogenated hydrocarbyl moiety containing 1 to 20 carbon atoms or a halogen, (b) reacting the liquid with a fluid comprising a halogenating agent and treatment with an electron donor to form a treated solid, and (c) post-treating the solid with a transition metal halide.</p> |
