| abstract |
To provide a propylene based block copolymer that, whennused as a molding material, exhibits an extremely goodnstiffness-impact resistance balance and has good heatnresistance and excellent moldability, and therefore, innmolding, good appearance is revealed. n That is, the invention provides a propylene based blockncopolymer obtained through a preceding stage step of producingna propylene polymer component (PP) and a subsequent stage stepnof producing a propylene-ethylene copolymer component (EP)nusing a metallocene catalyst, wherein the block copolymernsatisfies specific requisites. |