| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a propylene/ethylene-α-olefin block copolymer, by which a propylene-based block copolymer having a high melting point and including a copolymer part having a high molecular weight can be produced and in which the efficiency of taking ethylene orα-olefin being a copolymer monomer into the copolymer is high. SOLUTION: The method for producing the propylene-based block copolymer comprises continuously carrying out multistage polymerization composed of a front stage and a rear stage in the presence of a metallocene compound represented by formula [1]. COPYRIGHT: (C)2009,JPO&INPIT
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