Polypropylene-based resins and polypropylene-based resin compositions

摘要

Disclosed are a polypropylene-based resin and a polypropylene-based resin composition having well-balanced, high-level flowability, stiffness and impact resistance. The polypropylene-based resin has an MI of from 30 to 70 g/10 min and a 25 DEG C xylene-soluble content, x, of from 5 to 15 % by weight, in which the 25 DEG C xylene-soluble component is such that (a) its ethylene unit content, z, is from 20 to 30 % by weight, and (b) its intrinsic viscosity, Ä eta Ü, in decalin at 135 DEG C is not smaller than 2.00dl/g, and in which the 25 DEG C xylene-insoluble component is such that (c) its ethylene unit content, y (% by weight), satisfies the following: <MATH> (d) in GPC, the content of its constituent component having a molecular weight of not smaller than 10<6> is not smaller than 2 % by weight, (e) its MI is from 40 to 130 g/10 min, and (f) its stereospecificity index is not smaller than 98.5 %. The resin composition comprises (A) from 45 to 90 % by weight of the polypropylene-based resin, (B) from 5 to 50 % by weight of an ethylenic copolymer, and (C) from 0 to 25 % by weight of talc. <IMAGE>