Catalysts for the polymerization of olefins, comprising the product of the reaction between:
a) an Al-alkyl compound;
b) an electron-donor compound capable of reacting with MgCl2 but which results not to be completely complexed with AI-triethyl at the equivalent point of a potentiometric titration under standard conditions and belonging to particular classes of compounds;
c) a solid comprising a Ti compound having at least a Ti-halogen bond and an electron-donor compound belonging to particular classes of esters, both supported on a Mg halide in active form.
用于烯烃聚合的催化剂,包括以下反应的产物:
a) 铝烷基化合物
b) 一种电子供体化合物,能与
氯化镁反应,但在标准条件下电位滴定的等效点不能与 AI-triethyl 完全络合,属于特定类别的化合物;
c) 由至少有一个
钛卤键的
钛化合物和属于特定
酯类的电子供体化合物组成的固 体,二者均以活性形式支撑在卤化
镁上。