| 摘要 |
PROBLEM TO BE SOLVED: To obtain a propylene-based resin composition having excellent impact resistance, coating property and release resistance and suppressed in occurrence of flow mark. SOLUTION: This resin composition contains (A) a polypropylene-based polymer containing a propylene-ethylene block copolymer, (B) an ethylenebutene- based rubber, (C) a triblock copolymer and (D) talc. In the component A, melt flow rate(MFR) is 5-100g/10min, a ratio of xylene extract component is 15-60wt.% and propylene content in xylene extract component is 40-60wt.% and intrinsic viscosity in decalin is 2.0-5.0g/dl. In the component B, the butene content is 25-35wt.%. Critical energy release ratio (Gc) between the ethylene- butene-based rubber and xylene-insoluble component of the polypropylene polymer of the component A at 100C is >=30J/m<2> . In the component C, MFR is 5-40g/10min and viscosity at 230 deg.C becomes constant (0 shear viscosity) in an area having <=1rad/sec angular frequency and the 0 shear viscosity is 2,000-10,000 poise. Gc between the triblock copolymer and xylene-insoluble component of the polypropylene-based polymer of the component A at 100 deg.C is >=30J/m<2> and the content ratio is 2-10wt.%. In the component D, the average particle diameter is >=5μm and the content ratio is 5-25wt.%.
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