A process for preparing an olefin homopolymer or copolymer comprises contacting ethylene, an alpha-olefin, or a combination, and a catalytic amount of a metal-ligand complex catalyst of a particular formula that requires at least one halogen atom that is ortho to a bridging moiety. The strategic location of the halogen atom(s) ensures a product having a molecular weight that is predictably and significantly reduced in comparison with that of copolymers produced using otherwise identical metal-ligand complex catalysts that lack halogen atoms at the specified sites.
一种制备烯烃同聚物或共聚物的方法包括将
乙烯、α-烯烃或其组合物与特定公式的
金属
配体复合物催化剂中的催化量接触,该催化剂需要至少一个与桥接基团相邻的卤素原子。卤素原子的战略位置确保了产物的分子量与使用否则相同的缺乏指定位置卤素原子的
金属
配体复合物催化剂生产的共聚物相比,具有可预测且明显降低的分子量。