This work describes the preparation of catalysts by the immobilization of bis(n-butylcyclopentadienyl)zirconium dichloride, (nBuCp)2ZrCl, on magnesium dichloride adducts, MgCl2.nEtOH. The metal content on the support, which varied from 0,5 to 1,5 wt.-% Zr/MgCl2 and the catalysts activity were dependent on the ethanol content. In the temperature immobilization range between 25 and 75°C, the highest Zr incorporation and polymerization yield were obtained with the catalyst prepared at 25°C. Based on the results obtained in this work, a series of reactions that may occur between the catalyst components during its preparation are proposed. The polyethylenes obtained were characterized by its molecular weight and polydispersivity.
Metallocene; magnesium dichloride; polyethylene
