Particles of a procatalyst composition having a particle size D50 from 19 microns to 30 microns. A polymerization process comprising halogenating, in the presence of a substituted phenylene aromatic diester, particles of a MagTi procatalyst precursor to form particles of a procatalyst composition having a particle size D50 from 19 microns to 30 microns; first contacting a propylene and optionally one or more first comonomers with a catalyst composition comprising the particles of the procatalyst composition in a first polymerization reactor to form an active propylene-based polymer; and second contacting the active propylene-based polymer with at least one second comonomer in a second polymerization reactor to form a propylene impact copolymer.
一种原催化剂组合物的颗粒,其粒径 D50 为 19 微米至 30 微米。一种聚合工艺,包括在取代苯基芳香族二酯存在下,卤化 MagTi 催化剂前体颗粒,以形成颗粒尺寸 D50 为 19 微米至 30 微米的催化剂组合物颗粒;在第一聚合反应器中,首先将
丙烯和一种或多种第一单体与包含原催化剂组合物颗粒的催化剂组合物接触,形成活性
丙烯基聚合物;然后在第二聚合反应器中,将活性
丙烯基聚合物与至少一种第二单体接触,形成
丙烯抗冲共聚物。