abstract |
Disclosed is a polypropylene resin composition including: 100 parts by weight of (A) a propylene-based block copolymer including polymer components (I) and (II), wherein the polymer component (I) is a propylene polymer having an intrinsic viscosity [η] I of 0.1-5 dl/g, the polymer component (II) is a propylene polymer comprising propylene units and units of at least one comonomer selected from the group consisting of ethylene and α-olefins having 4-12 carbon atoms and having an intrinsic viscosity [η] II of from 1-20 dl/g and the content of the polymer component (II) is 1-70% by weight; and 0.001-5 parts by weight of (B) a nucleating agent composed of particles having an average particle diameter, as measured by the laser diffraction method, of 0.01-3 mm wherein particles having particle diameters of not less than 10 mm account for less than 5% by weight of all the particles of the nucleating agent. |