| 摘要 |
PURPOSE:To obtain the title composition excellent in impact resistance, paintability and rigidity and easily moldable without forming voids etc., by mixing a specified crystalline propylene/ethylene block copolymer with a specified amorphous copolymer component, talc, etc. CONSTITUTION:A resin composition for automobile bumpers of a melt flow rate >=10g/10min, comprising 60-85pts.wt. crystalline propylene/ethylene block copolymer (A) comprising 50-80wt.% propylene polymer component (a) of an isotactic index >=90, 16-20wt.% specified propylene/ethylene copolymer (b) and 3-20wt.% specified ethylene copolymer component (c), and having an ethylene unit content of 10-30mol.% a melt flow rate of 10-30g/10min, 5-20pts.wt. amorphous ethylene/alpha-olefin random copolymer component (B) of an ethylene unit content of 60-85mol.%, a melt flow rate of 0.1-5.0g/10min and a crystallinity <=15% according to X-ray diffractometry and 8-15pts.wt. talc or CaCO3 component (C) of a mean particle diameter of 0.1-5mu. |
