| abstract |
(57) [Summary] [Purpose] To provide an ethylene-propylene block copolymer having excellent rigidity, impact strength, melt flowability, and good appearance of molded articles. [Structure] The weight ratio of the crystalline polypropylene portion to the ethylene-propylene random copolymer portion is 95 to 80/5. 20 and the intrinsic viscosity [η] P of the crystalline polypropylene portion is 0.8 to 2.0 dl / g, the ratio Q value of the molecular weight measured by GPC (weight average molecular weight M w / number average molecular weight M N ) is 3.0 to 5.0, xylene solubles at 20 ° C. is 1.5 An ethylene-propylene block copolymer having an ethylene content of 20 to 60% by weight in a propylene-ethylene random copolymer portion and an intrinsic viscosity [η] EP of 3.5 to 8.5 dl / g. |