The metallocenes L2MCl2 (M = Zr or Ti, L = Cp, n-BuCp, i-PrCp, t-BuCp, Me5Cp, or Ind) upon immobilization on magnesium carrier were used in ethylene homopolymerization and its copolymerization with 1-hexene. The effect of catalyst composition on the anchored metal content, catalyst activity, comonomer reactivity, and polymer properties was investigated. The results obtained with supported catalysts were compared with those obtained with their homogeneous counterparts under the same (co)polymerization conditions. It was found that after immobilization the catalysts studied gave polymers with clearly higher molecular weight than did their homogeneous counterparts.
Comparison of molecular weight of PE obtained with homogeneous and supported zirconocene catalysts: (1)-(t-BuCp)2ZrCl2; (2)-(n-BuCp)2ZrCl2; (3)-(i-PrCp)2ZrCl2; (4)-(Me5Cp)2ZrCl2; (5)-Ind2ZrCl2.