Highly active supported catalysts for olefin polymerization: Preparation and characterization of the catalyst

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Abstract
With use of the support prepared by the reaction1 of a Grignard reagent with reaction mixture of AlCl3 and CH3Si(OC2H5)3, an immobilized active stereospecific titanium catalyst was prepared by the three‐step treatment of the support, first with TiCl4, second with ethylbenzoate, and third with TiCl4 again. The catalyst was also prepared by the two‐step treatment of the support, with the mixture of TiCl4 and ethylbenzoate, and with TiCl4. Solids obtained in each step of the catalyst preparation were characterized by elemental and IR analysis, and their activities for propylene polymerization were determined with triethylaluminum as a cocatalyst under an atmospheric propylene pressure for 1 h at 60°C. The experimental data support the idea that both TiCl4 and ethylbenzoate as donors are immobilized on the surface of the active stereospecific catalyst without any interaction between them.