Process for the preparation of polyolefins

摘要

Polyolefins with a molecular weight distribution Mw/Mn>/=3.0, which may be monomodal, bimodal or multimodal, can be obtained by polymerization or copolymerization of olefins with a catalyst system consisting of an aluminoxane and a transition metal component (metallocene), in which the transition metal component consists of at least one zirconocene of the formula I and at least one zirconocene of the formula Ia or alternatively of at least 2 zirconocenes of the formula I.