申请人:Dow Global Technologies LLC
公开号:US10968297B2
公开(公告)日:2021-04-06
Catalyst compositions and polymerization systems include at least one thiourea 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 thiourea complex is a bidentate thiourea ligand bound to the metal center and having Formula (Ia), Formula (Ib), or Formula (Ic): (Formulas should be inserted here). In Formulas (Ia), (Ib), and (Ic), each group R1, R2, and R3 is independently chosen from alkyl groups or aryl groups; each group Z1 or Z2 is independently chosen from alkylene groups. If a=2, groups R1 of the two groups Q are optionally linked, or groups R3 of the two groups Q are optionally linked. 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)的硫脲络合物:MQaX4-a (I) 其中 M 是 Ti、Zr 或 Hf;a 是 1 或 2;硫脲络合物的每个基团 Q 是与金属中心结合的双齿硫脲配体,具有式 (Ia)、式 (Ib) 或式 (Ic):(此处应插入公式)。在式(Ia)、(Ib)和(Ic)中,每个基团 R1、R2 和 R3 独立选自烷基或芳基;每个基团 Z1 或 Z2 独立选自亚烷基。如果 a=2,则两个基团 Q 的基团 R1 有选择地相连,或两个基团 Q 的基团 R3 有选择地相连。每个 X 都与金属中心共价键合或配位,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。