An olefin polymerization catalyst is provided which is composed of an olefin-prepolymerized catalyst prepared by prepolymerizing an olefin on a catalyst formed from (a) a carrier, (c) an organoaluminumoxy compound, and (d) a metallocene compound; (e) an organoaluminum compound, and (f) an ionizing ionic compound. The olefin-prepolymerized catalyst may be prepared with an organoaluminum compound as an additional component of the catalyst. A process for producing a polyolefin is also provided polymerizes or copolymerize olefin in the presence of the above olefin polymerization catalyst. This catalyst exhibits high catalyst activity in olefin polymerization even when the catalyst contains a smaller amount of an organoaluminumoxy compound, and the polyolefin production process gives a polymer having excellent particle properties.
本发明提供了一种烯烃聚合催化剂,该催化剂由烯烃预聚催化剂组成,烯烃预聚催化剂的制备方法是将烯烃预聚在由(a)载体、(c)
有机铝氧化合物和(d)茂
金属化合物;(e)
有机铝化合物和(f)电离离子化合物形成的催化剂上。烯烃预聚合催化剂可以用
有机铝化合物作为催化剂的附加组分来制备。还提供了一种在上述烯烃聚合催化剂存在下聚合或共聚烯烃的聚烯烃生产工艺。这种催化剂在烯烃聚合中表现出很高的催化剂活性,即使催化剂中
有机铝氧化合物的含量较低,聚烯烃生产工艺也能得到颗粒性能优良的聚合物。