This invention provides a metallocene complex and the preparation method thereof and a catalyst composition. This catalyst composition comprises a metallocene complex represented by formula (I) and an organic boron salt. Compared to the prior art, the catalyst used in this invention, which is the metallocene complex represented by formula (I), does not contain any side chain, and the coordination space of the central metal has a large opening degree. Therefore, the catalytic activity for more sterically hindered monomers is higher, and the comonomer incorporation is also higher. Furthermore, the metallocene complex represented by formula (I) used in this invention is a heterocyclic ring fused cyclopentadienyl ligand. Heterocyclic rings have relatively strong electron-donating capacity. By fusing a cyclopentadienyl group using heterocyclic rings, it is possible to change the electronic effect of the metal center and in turn increase the activity of catalyst. Therefore, by using the metallocene complex represented by formula (I), it is possible to prepare copolymers of ethylene with other olefins at high activity and high comonomer incorporation, and it is also possible to catalyze the polymerization of styrene and substituted styrene at high syndiotacticity and high activity.
本发明提供了一种茂
金属络合物及其制备方法和一种催化剂组合物。该催化剂组合物由式(I)表示的茂
金属络合物和有机
硼盐组成。与现有技术相比,本发明中使用的催化剂,即式(I)表示的茂
金属络合物,不含任何侧链,中心
金属的配位空间具有较大的开放度。因此,对立体受阻单体的催化活性更高,共聚单体的掺入量也更高。此外,本发明中使用的式 (I) 所代表的茂
金属配合物是一种杂环融合
环戊二烯配体。杂环具有相对较强的电子负载能力。通过使用杂环融合
环戊二烯基,可以改变
金属中心的电子效应,从而提高催化剂的活性。因此,使用式 (I) 所代表的茂
金属配合物,可以高活性和高共聚物掺入量制备
乙烯与其他烯烃的共聚物,还可以高联合活性和高活性催化
苯乙烯和取代
苯乙烯的聚合。