| 摘要 |
PROBLEM TO BE SOLVED: To obtain a propylene-based resin composition having coating performance given by assuming that the composition is subjected to primerless coating of a water-based coating material, having such electrical conductivity as to enable to conduct electrostatic coating, and further having an excellent balance between the coating performance, the electrical conductivity and mechanical characteristics, and to provide a molded product of the same. SOLUTION: The propylene-based resin composition is composed of a polypropylene homopolymer part and a propylene-ethylene copolymer part, wherein the polypropylene homopolymer part has a MFR of 100-800 g/10 min, a ratio of (Mw/Mn) of≥2.8, and an IPF of≥0.98, and the propylene-ethylene copolymer part contains polypropylene in an amount of 50-85 wt% and has a glass transition temperature of≤-40°C and an intrinsic viscosity ([η]) of 3-15 dl/g. Further, the propylene-based resin composition contains a block copolymer having a MFR of 70-500 g/10 min in an amount of 100 pts.wt., a modified polypropylene having a relationship between a graft rate and a Mn satisfying a specified equation in an amount of 1-13 pts.wt., and an electrically-conductive carbon black in an amount of 0.1-25 wt%, so that the propylene-based resin composition has a shear viscosity ratio of (η<SB>a</SB>/η<SB>b</SB>) of≥30 and has a MFR of 0.1-100 g/10 min. COPYRIGHT: (C)2004,JPO
|
