| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polypropylene resin composition suitable for producing an expansion molding reduced in swirl marks problematic in injection expansion molding. SOLUTION: The polypropylene resin composition comprises (A) 50-100 mass% of polypropylene, (B) 0-50 mass% of an ethylene-α-olefin copolymer, (C) 0-25 mass% of talc and (D) a foaming agent, wherein the compounding amount of the component D is 0.3-2.0 pt(s). mass based on 100 pts. mass of the total of the components A, B and C. For the component A, a blend of the components A and B, or a blend of the components A, B and C, the melt index(MI) determined at 230°C is 30-100 g/10min and the capillary swell d/d<SB>0</SB>( (d) is resin expansion diameter, and d<SB>0</SB>is die diameter ) is≥1.8 at 190°C and at a shearing rate of 1,220 s<SP>-1</SP>. COPYRIGHT: (C)2005,JPO&NCIPI
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