POLYPROPYLENE RESIN COMPOSITION FOR INJECTION MOLDING, AND MOLDED ARTICLE

摘要

This polypropylene resin composition for injection molding contains a propylene resin material and a crystallization nucleating agent. The intrinsic viscosity of the xylene-soluble portion of said polypropylene resin composition is 0.8 to 1.4 dl/g, and the melt flow rate of the polypropylene resin composition is 5 to 15 g/10 min. The aforementioned propylene resin material is obtained by polymerizing an ethylene/1-butene copolymer, containing 74% to 86% ethylene units by mass, in the presence of an ethylene/propylene copolymer which contains 2.0% to 4.0% ethylene units by mass. Said ethylene/1-butene copolymer constitutes 10% to 20% of the mass of the polypropylene resin composition. This invention makes it possible to provide a polypropylene resin composition for injection molding that exhibits excellent transparency, resistance to blushing, and low-temperature impact strength.