Provided is a method for producing a propylene polymer capable of conveniently and sufficiently reducing a catalyst residue in a propylene polymer. The method for producing a propylene polymer comprises the following step (1) and step (2):
step (1): a step of polymerizing propylene in the presence of a catalyst to obtain a propylene polymer;
step (2): a step of washing the propylene polymer obtained in step (1) with a deashing agent to remove a catalyst residue in the propylene polymer, the step satisfying the following formula (1): 4.4×logT−logEW>0.34×δW−δE wherein T represents a temperature (°C) at the time of washing the propylene polymer with the deashing agent; EW represents a water content (wt%) in the deashing agent; δ(W) represents a Hansen solubility parameter of water; and δ(E) represents a Hansen solubility parameter of the deashing agent.
本发明提供了一种生产
丙烯聚合物的方法,该方法能够方便、充分地减少
丙烯聚合物中的催化剂残留。生产
丙烯聚合物的方法包括以下步骤(1)和步骤(2):
步骤(1):在催化剂存在下聚合
丙烯以获得
丙烯聚合物的步骤;
步骤(2):用脱灰剂洗涤步骤(1)中得到的
丙烯聚合物,以除去
丙烯聚合物中的催化剂残留物,该步骤满足下式(1):4.4×logT-logEW>0.34×δW-δE 其中,T 表示用脱灰剂洗涤
丙烯聚合物时的温度(℃);EW 表示脱灰剂中的
水含量(wt%);δ(W) 表示
水的汉森溶解度参数;δ(E) 表示脱灰剂的汉森溶解度参数。