Olefins are polymerized by novel transition metal complexes of selected iminocarboxylate and iminoamido ligands, sometimes in the presence of cocatalysts such as alkylaluminum compounds or neutral Lewis acids. Olefins which may be (co)polymerized include ethylene, α-olefins, and olefins containing polar groups such as olefinic esters for example acrylate esters. Also described are certain “Zwitterionic” transition metal complexes as polymerization catalysts for making polar copolymers. The resulting polymers are useful as thermoplastics and elastomers.
烯烃通过选定的
亚胺羧酸酯和
亚胺酰胺
配体的新型过渡
金属配合物聚合,有时在辅助催化剂的存在下进行,例如烷基铝化合物或中性Lewis酸。可以(共)聚合的烯烃包括
乙烯,α-烯烃,以及含有极性基团的烯烃,例如烯
丙酸酯。还描述了某些“带电离子”过渡
金属配合物作为制备极性共聚物的聚合催化剂。所得的聚合物可用作热塑性塑料和弹性体。