A process for the polymerization of an alpha mono-olefin in the presence of certain supported coordination catalysts systems which comprise (a) a procatalyst, (b) a cocatalyst and, (c) a selectivity control agent, wherein
(a) is a solid composition comprising magnesium chloride, titanium tetrachloride, and an electron donor;
(b) is an aluminium trialkyl; and
(c) is a combination of a strong selectivity control agent and a weak selectivity control agent.
一种在某些支撑配位催化剂体系存在下聚合α-单烯烃的工艺,该催化剂体系包括 (a) 催化剂、(b) 助催化剂和 (c) 选择性控制剂,其中
(a) 是由
氯化镁、
四氯化钛和电子供体组成的固体组合物;
(b) 是三烷基铝;和
(c) 是强选择性控制剂和弱选择性控制剂的组合。