A catalyst system for the polymerization of olefins may include a first solid catalytic component and a second solid catalytic component. The first solid catalytic component may include: a spherical MgCl2-xROH support; a group 4-8 transition metal; and a diether internal electron donor. The second solid catalytic component may include: a spherical MgCl2-xROH support; a group 4-8 transition metal; and a diether internal electron donor. The first solid catalytic component produces a propylene homopolymer having a Xylene Solubles (XS) value of greater than 2 wt %; and the second solid catalytic component produces a propylene homopolymer having a XS value of less than 2 wt %. The second catalytic component may act as an external electron donor during use, and embodiments herein do not require use of any additional external electron donors to control polymerization and reliably vary the properties of the resulting polymer.
用于
烯烃聚合的
催化剂系统可包括第一固体催化组分和第二固体催化组分。第一种固体催化组分可包括:球形 MgCl2-xROH 载体;4-8 族过渡
金属;
二醚内部电子供体。第二种固体催化组分可包括:球形 MgCl2-xROH 载体;4-8 族过渡
金属;
二醚内部电子供体。第一种固体催化组分生成的
丙烯均聚物的二
甲苯溶解度 (XS) 值大于 2 wt %;第二种固体催化组分生成的
丙烯均聚物的二
甲苯溶解度 (XS) 值小于 2 wt %。在使用过程中,第二种催化组分可作为外部电子供体,本发明的实施例不需要使用任何额外的外部电子供体来控制聚合,并可靠地改变所得
聚合物的特性。