| 摘要 |
A thermoplastic resin composition comprising: (A) 20 to 60% by weight of a propylene-ethylene block copolymer obtained by block copolymerizing 70 to 95% by weight based on the total weight of the block copolymers, of propylene homopolymers obtained by polymerizing propylene at first stage, having a relationship represented by the formulas 1.00 ? P ? 0.015 log MFR + 0.955 (wherein P is an isotactic pentad ratio of a propylene homopolymer and MFR is a melt flow rate thereof), and 30 to 5% by weight, based on the total weight of the block copolymer of ethylene or. ethylene and propylene at one or more stages, the ethylene content being 3 to 12% by weight based on the total weight of the block copolymers; (B) 60 to 20% by weight of a styrene homopolymer; and (C) 5 to 30% by weight of a styrene-ethylene?butylene-styrene block copolymer or a styrene-ethylene?propylene block copolymer, the total of (A), (B) and (C) being 100% by weight. |
