| 摘要 |
<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, easy handleability and no stickiness and has excellent transparency and 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 process for 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 process for adding at least one kind of reaction products (E) of an active hydrogen-containing compound (D) and an organoaluminum compound (C') to it and performing polymerization. <P>COPYRIGHT: (C)2013,JPO&INPIT |
