| 摘要 |
PROBLEM TO BE SOLVED: To provide a propylene block copolymer excellent in flexibility and impact resistance and showing a good polymer powder form. SOLUTION: The new propylene block copolymer satisfies specific requirements and is produced by a process comprising continuously performing a multi-step polymerization composed of a former step in which a propylene homopolymer component or a specific propylene copolymer component is produced in the presence of a metallocene catalyst carried on a support and a latter step in which a specific copolymer component of propylene and a comonomer is produced by gas phase polymerization. COPYRIGHT: (C)2007,JPO&INPIT
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