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Ethylene was polymerized in toluene using methylalumoxane (MAO) activated rac‐(Me2SiOSiMe2)[Ind]2ZrCl2 (1) and rac‐(Me2SiOSiMe2)[IndH4]2MtCl2 (Mt = Zr (2); Mt = Ti (3)). All three catalyst systems polymerize ethylene with high activity. The molecular weight of polymer produced with zirconocene (1) was up to a weight‐average molecular weight M̄w = 1.1 × 106 at low polymerization temperature (<20°C) under atmospheric pressure. The titanocene catalyst 3 shows lower activity and produced lower molecular weight polyethylene than zirconocenes 1 and 2. Replacement of aromatic rings in 1 by cyclohexane rings, leading to 2, increases activity and reduces molecular weight. The catalyst systems show a dependency of the activity on temperature.
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Liang et al. (1996) studied this question.
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