| 摘要 |
PROBLEM TO BE SOLVED: To obtain a crystalline propylene block copolymer composition for automotive parts, excellent in flowability at the time of molding and, in addition, the balance of properties. SOLUTION: This crystalline propylene block copolymer composition for automotive parts comprises 41-71 wt.% crystalline propylene block copolymer composed of propylene homopolymer moieties (Fp) and ethylene-propylene random copolymer moieties (Fc) and having an ethylene content of 1-10 wt.% and a melt flow rate(MFR), measured at 230 deg.C under a load of 2,160g, of 20-100 g/10 min, 12-22 wt.% hydrogenated block copolymer having a relatively low styrene content, 2-12 wt.% hydrogenated block copolymer having a relatively high styrene content, and 15-25 wt.% talc, the Fp containing 20-50 wt.% low molecular propylene hompolymers with an MFR of 400-1,000 g/10 min and having an average MFR of 100-350 g/10 min and an isotactic pentad ratio, measured by<13> C-NMR, of not less than 98%, and the Fc having an intrinsic viscosity [η], measured at 135 deg.C in decahydronaphthalene, of not less than 7 dl/g. |
