The present invention relates to catalysts for the polymerization of ethylene and its mixtures with olefins CH₂=CHRVIII, comprising the reaction product of a solid catalyst component containing Ti, Mg and halogen, an alkyl-Al compound and a particular electron donor compound selected from the compounds containing at least two oxygen atoms bonded to different carbon atoms and selected by standard tests of reactivity with triethyl-Al and MgCl₂ compounds.
The catalyst of the invention are used in processes for the (co)polymerization of ethylene to prepare (co)polymers having narrow molecular weight distribution (MWD).
                            本发明涉及
乙烯及其混合物与烯烃 CH₂=CHRVIII聚合的催化剂,包括含有 Ti、Mg 和卤素的固体催化剂组分、烷基-Al 化合物和特定电子供体化合物的反应产物,该特定电子供体化合物选自含有至少两个氧原子键合在不同碳原子上的化合物,并通过与三乙基-Al 和 MgCl₂化合物反应性的标准测试选出。
本发明的催化剂可用于
乙烯的(共)聚合工艺,以制备分子量分布(MWD)较窄的(共)聚合物。