| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for producing a propylene-based block copolymer as a reactor TPO, which has extremely low crystallinity, forms polymer particles having high flowability and easy handleability, has excellent transparency and no stickiness, and exhibits a high balance between flexibility and heat resistance. <P>SOLUTION: The method for producing a propylene-based block copolymer by multi-step polymerization includes producing a crystalline polypropylene component (A) by a first step of polymerizing a propylene-based monomer in the presence of a metallocene catalyst (M) and an organoaluminum compound (C) and then producing a propylene-based elastomer component (B) by a second step of adding a≥4C hydroxo compound (D) to it and performing polymerization in the presence of it. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
