process for polymerizing an a-olefin, which comprises conducting polymerization of the a-olefin using a catalyst formed by previously bringing a highly active titanium solid catalyst component, a catalyst component of an organo-metallic compound of a group I to III metal of the periodic table, a catalyst component of an organic halogen compound or of a transition metal compound, and a catalyst component of an organo-silicone compound or of a sterically hindered amine into contact with each other in an inert solvent in the absence of the a-olefin, or a catalyst formed by conducting preliminary polymerization of the a-olefin in the presence of the above-described catalyst wherein the final component is optional. This process polymers having excellent stereospecificity with the catalyst showing high activity, thus attaining industrial advantages.
                            聚合 a-olefin 的工艺,该工艺包括使用一种催化剂进行 a-olefin 的聚合,该催化剂是通过事先将一种高活性
钛固体催化剂组分、一种元素周期表第 I 至 III 族
金属的有机
金属化合物催化剂组分、一种有机卤素化合物或一种过渡
金属化合物的催化剂组分、一种
有机硅化合物或一种立体受阻胺的催化剂组分在一种惰性溶剂中相互接触而形成的、和
有机硅化合物或立体受阻胺的催化剂组分在没有 a-olefin 的情况下在惰性溶剂中相互接触,或在有上述催化剂存在的情况下对 a-olefin 进行初步聚合而形成的催化剂,其中最终组分是可选的。这种工艺生产出的聚合物具有极佳的立体特异性,催化剂活性高,因而具有工业优势。