| 摘要 |
PURPOSE:To obtain a polypropylene compsn. which has excellent impact resistance and rigidity and of which the impacted part is not whitened, by blending a specified propylene/ethylene block copolymer with high-density polyethylene in a specified ratio. CONSTITUTION:This polypropylene compsn. has a melt flow rate (ASTM D1238L, 230 deg.C, 2.16kg) of 0.2-100g/10min and is obtd. by blending 100pts.wt. propylene/ethylene block copolymer (A) with 5-3pts.wt. high-density polyethylene (B) having a density of not lower than 0.940g/cm<3>. Said copolymer (A) is are having an ethylene content of 5-50mol%, composed of 97-40wt% polylene polymer component (I) having an isotactic index of not lower than 93, 3-45wt% propylene/ethylene copolymer component (II) having an ethylene content of 15-40mol% and an intrinsic viscosity of 1.0-4.5dl/t and 0-20wt% high-density ethylene polymer component (III) having an intrinsic viscosity of 1.0-4.5dl/g. |
