A process for preparing a polyolefin by polymerizing at least one olefin in the presence of a catalyst comprising a solid catalyst component and an organometallic compound, said solid catalyst component being a product obtained by intercontacting the following components (i)-(iv):
(i) a silicon oxide and/or an aluminium oxide,
(II) a reaction product obtained by the reaction of a magnesium halide and a compound represented by the general formula Me(OR)nXz-n wherein Me is an element of Groups I-IV in the Periodic Table, z is the valence of the element Me, n is 0 < n ≦ z, X is a halogen atom and R is a hydrocarbon radical having 1 to 20 carbon atoms,
(iii) a halogenated silicon compound, and
(iv) a titanium compound and/or a vanadium compound.
一种制备聚烯烃的工艺,其方法是在由固体催化剂组分和有机
金属化合物组成的催化剂存在下聚合至少一种烯烃,所述固体催化剂组分是由以下组分(i)-(iv)相互接触得到的产物:
(i) 氧化
硅和/或氧化铝、
(II) 由卤化
镁和通式 Me(OR)nXz-n 所代表的化合物反应得到的反应产物,其中 Me 是元素周期表中 I-IV 族的元素,z 是 Me 元素的化合价,n 是 0 < n ≦ z,X 是卤素原子,R 是具有 1 至 20 个碳原子的烃基、
(iii) 卤化硅化合物,和
(iv) 钛化合物和/或
钒化合物。