Disclosed is a production method of polypropylene having high MFR value and excellent product qualities with high productivity. The method enables to produce a propylene polymer by a gas phase process where the reaction heat is removed mainly by the heat of vaporization of liquefied propylene. The method is characterized by using a solid catalyst component (A) which is prepared by contacting components (A1), (A2) and (A3) shown below. Further disclosed are: a propylene polymer produced by the method; a propylene polymer composition; and a molded body of the composition. Component (A1) : a solid component containing titanium, magnesium and a halogen as essential components. Component (A2): a vinyl silane compound. Component (A3): an organosilicon compound having an alkoxy group (A3a) and/or a compound having at least two ether bonds (A3b).
                            本发明公开了一种生产聚
丙烯的方法,该方法具有较高的 MFR 值和优异的产品质量,且生产率高。该方法可通过气相工艺生产
丙烯聚合物,在气相工艺中,反应热主要通过液化
丙烯的汽化热带走。该方法的特点是使用固体催化剂组分 (A),该组分是由下图所示的组分 (A1)、(A2) 和 (A3) 接触制备的。进一步公开了:用该方法生产的
丙烯聚合物;
丙烯聚合物组合物;以及该组合物的模塑体。组分 (A1):一种固体组分,其主要成分为
钛、
镁和卤素。组分(A2):
乙烯基硅烷化合物。组分(A3):具有一个烷氧基(A3a)和/或至少具有两个醚键(A3b)的
有机硅化合物。