A method of polymerizing at least one olefin comprising contacting the olefin with a catalyst composition comprising:
1) a procatalyst composition comprising a magnesium and titanium-containing component and an electron donor compound of the structure:
wherein R1 is ethoxy, and R2 is an alkoxy group having from one to ten carbon atoms, and R3-R6 are each individually, hydrogen, hydrocarbyl, hydrocarboxy, nitro, a silyl group or a halogen,
2) a cocatalyst and optionally
3) a selectivity control agent.
一种聚合至少一种烯烃的方法,包括将该烯烃与一个催化剂组合物接触,该催化剂组合物包括:
1)一个前催化剂组合物,包括含有
镁和
钛的组分以及结构为以下式子的电子给体化合物:
其中R1为乙氧基,R2为具有一到十个碳原子的烷氧基,R3-R6分别为氢、烃基、羟基烃基、硝基、
硅基或卤素;
2)一个协同催化剂;和可选的
3)一个选择性控制剂。