| 摘要 |
Improved lower alpha -olefin polymerization catalysts are produced from an organoaluminum cocatalyst, a selectivity control agent and a specified magnesium-containing, titanium-containing, halide-containing procatalyst. The procatalyst is produced from an electron donor, tetravalent titanium halide and a complex alkoxide compound formed from magnesium alkoxide, titanium alkoxide and a phenolic compound. The catalyst is utilized produce poly- alpha -olefin in good yield, which polymer is characterized by a relatively low xylene solubles content and a relatively high bulk density.
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