A catalyst system useful in polymerizing olefins comprising a solid, hydrocarbon-insoluble catalyst component containing magnesium, titanium and halogen and an internal or external electron donor comprising a substituted hydrocarbyl four to eight-membered cycloalkane dicarboxylate wherein the substituents are positioned on the cycloalkane to place the dicarboxylate groups into adjacent conformational positions and wherein the substitutes contain 1 to 20 carbon atoms and may be joined to the cycloalkane structure to form a bicyclo structure.
一种在聚合烯烃中有用的催化剂系统,包括固体、烃类不溶性催化剂组分,其中包含
镁、
钛和卤素,以及一种内部或外部电子给体,该电子给体包括一种取代的烃基四到八元环
戊二酸酯,其中取代基位于
环戊烷上,将二
羧酸基置于相邻的构象位置,并且取代基含有1到20个碳原子,并且可以与
环戊烷结构连接形成双环结构。