Metallocene catalysts and preparation and use

Abstract From the Canadian patent

Novel metallocene compounds are provided which are useful as polymerization catalysts, particularly in the polymerization of addition polymerizable monomers such as olefinic or vinyl monomers. Preferred polymer compositions prepared using the novel catalysts are bimodal or multimodal in nature typically having a bimodal or multimodal molecular weight distribution. The metallocenes are binuclear or multinuclear and contain two or more chemically , distinct active sites. Methods for synthesizing the novel catalysts are also provided, as are methods for using the novel compounds as homogeneous or heterogeneous polymerization catalysts.