| 摘要 |
The present invention is a unique polypropylene copolymer resin composition which comprises a propylene-ethylene copolymer having a melt flow rate of at least 50 g/10 min and an impact modifier which comprises a thermoplastic elastomer of a hydrogenated triblock copolymer which has a specific structure in which a block of a tapered increment of an vinyl aromatic hydrocarbon portion is arranged after the isoprene homopolymer block. Accordingly, the present invention provides a polypropylene resin composition comprising (a) 55 to 87% by weight of a propylene-ethylene block copolymer having a melt flow rate of at least 50 g/10 minutes; and (b) 3 to 20% by weight of an impact modifier which is comprised of at least 50% by weight of a hydrogenated block copolymer having a number average molecular weight between 50,000 and 150,000 and containing 15 to 25% by weight of an vinyl aromatic hydrocarbon, obtained by hydrogenating a triblock copolymer having the structure A-B-(A/B) wherein A is a vinyl aromatic hydrocarbon homopolymer, B is an isoprene homopolymer, and (A/B) is a block of a tapered isoprene-vinyl aromatic hydrocarbon copolymer, and the balance an olefinic rubber; and (c) 10 to 25% by weight of talc.
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