Group 4 metal complexes comprising a cyclopentaphenanthreneyl ligand, catalytic derivatives thereof and their use as olefin polymerization catalysts, especially for the copolymerization of ethylene and a vinylaromatic monomer are disclosed. The resulting copolymers are uniform, pseudo-random copolymers of ethylene and a vinylaromatic monomer having a cluster index, CI.sub.ES less than 1.0 and a polymerized vinylaromatic monomer content less than 50 mole percent.
本发明公开了一种包括环戊二十碳
芳烃基
配体的第四族
金属配合物,其催化衍
生物及其作为烯烃聚合催化剂的使用,特别是用于
乙烯和
乙烯基芳香单体的共聚合物的聚合。所得到的共聚物是
乙烯和
乙烯基芳香单体的均匀的伪随机共聚物,具有簇指数CI.sub.ES小于1.0和聚合的
乙烯基芳香单体含量小于50摩尔百分比。