PROPENE POLYMERIZATION WITH A MG(OC2H5)2-SUPPORTED TICL4 CATALYST .3. THE ROLE OF BENZOYL CHLORIDE

The catalyst systems Mg(OC2H5)2/benzoyl chloride (BC)/TiCl4 and Mg(OC2H5)2/ethyl benzoate (EB)/TiCl4 were prepared for the polymerization of propene. In case of the Mg(OC2H5)2/BC/TiCl4 catalyst, BC changes into the internal donor EB during the in situ preparation of the catalyst and the unchanged BC acts as additional donor after reaction with triethylaluminium (TEA). Catalyst activity and isospecificity were also studied for the two catalysts by changing the amounts of BC or EB in the polymerization of propene cocatalyzed with TEA.