abstract |
The present invention provides olefin polymerization catalysts and processes for preparing a polypropylene and a propylene block copolymer using said olefin polymerization catalysts. The olefin polymerization catalyst (1) of the invention is formed from: [I-1] a contact product obtained by contacting: (A) a solid titanium catalyst component, (B) an organometallic compound catalyst component, and (C) a specific organosilicon compound; [II-1] (D) a specific polyether compound; and optionally, [III] an organometallic compound catalyst component. The olefin polymerization catalyst (2) of the invention is formed from: [I-2] a contact product obtained by contacting: (A) a solid titanium catalyst component, (B) an organometallic compound catalyst component, and (D) a specific polyether compound; [11-2] (C) a specific organosilicon compound. |