Highly active supported catalysts for olefin polymerization. Supports from a grignard reagent for preparation of highly active catalysts

Supports were obtained by the interaction of C₄H₉MgCl with the reaction mixture of AlCl₃ and CH₃Si(OC₂H₅)₃ or Si(OC₂H₅)₄ (Mg/Al/Si = 2/1/1). With the combination of Al(C₂H₅)₃ and methyl-p-toluate, immobilized titanium catalysts prepared by the treatment of the supports with TiCl₄ and ethylbenzoate showed extraordinary high activity and stereoregularity in the polymerization of propylene.¹ By the study of the reaction of AlCl₃ with CH₃Si(OC₂H₅)₃, the elemental analysis and powder x-ray diffractometric measurements of the supports, it was found that the supports comprised of Cl, Mg, Al, and Si atoms, OC₂H₅ groups, C₄H₉ groups, and ethers, and that they were amorphous solids to the extent that the x-ray diffraction peak assigned to the 003 plane in MgCl₂ crystals completely disappeared.