| 摘要 |
PROBLEM TO BE SOLVED: To provide a propylenic block copolymer which is excellent in rigidity and impact resistance, especially impact resistance at a low temperature. SOLUTION: This propylenic block copolymer comprises a propylenic polymer component and an ethylene-propylene copolymer component, and satisfies the following requirements (I) and (II). (I) The melting temperature of the propylenic polymer component is≥160°C. (II) The ethylene-propylene copolymer component (2) has the following structure. The ethylene content measured by<SP>13</SP>C-NMR is 40 to 60 wt.%. The crystallization calorie of a crystallization peak appearing at 90 to 105°C is 2 to 10 J/g-EP. The glass transition temperature is≤-50°C. The racemic peak intensity ratio to the meso peak intensity of an ethylene-propylene bound portion is 0.01 to 0.7 measured by<SP>13</SP>C-NMR. COPYRIGHT: (C)2008,JPO&INPIT
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