Catalyst compositions and polymerization systems include at least one thioguanidine complex according to Formula (I): MQaX4_a (I) in which M is Ti, Zr, or Hf; a is 1 or 2; each group Q of the thioguanidine complex is a bidentate thioguanidine ligand bound to the metal center and having Formula (1a) or Formula (1b), In Formulas (1a) and (1b), each group R1, R2, and R3 is independently chosen from alkyl groups or aryl groups; each group Z1 is independently chosen from alkylene groups. If a=2, groups R3 of the two groups Q are optionally linked to each other through at least one covalent bond. Each X is covalently bonded or coordinated to the metal center and is independently chosen from alkyl groups or halides. The polymerization systems may be configured to copolymerize ethylene and α-olefins.
催化剂组合物和聚合体系包括至少一种符合式(I)的
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胍络合物:MQaX4_a (I) 其中 M 是 Ti、Zr 或 Hf;a 是 1 或 2;
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胍络合物的每个基团 Q 是与
金属中心结合的双齿
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胍配体,具有式 (1a) 或式 (1b),在式 (1a) 和 (1b) 中,每个基团 R1、R2 和 R3 独立选自烷基或芳基;每个基团 Z1 独立选自亚烷基。如果 a=2,则两个基团 Q 的基团 R3 可通过至少一个共价键彼此连接。每个 X 都与
金属中心共价结合或配位,并独立地选自烷基或卤化物。聚合系统可配置为
乙烯和 α-烯烃的共聚物。