| 摘要 |
PROBLEM TO BE SOLVED: To provide a polypropylene resin composition excellent both in physical property balance and in linear expansion property without adding a filler. SOLUTION: The polypropylene resin composition contains a heterophasic polypropylene component (A) satisfying requirements (i)-(iv). (i) The resin composition is composed of an ethylene-α-olefin copolymer component (A<SB>1</SB>) and a crystalline homopolypropylene component and contains not less than 20 mass% and less than 85 mass% of component A<SB>1</SB>, when the total amount of component A is made 100 mass%. (ii) The content of component A<SB>1</SB>in component A is not less than 5 mass%, when the total amount of the polypropylene resin composition is made 100 mass%. (iii) Component A<SB>1</SB>has specific viscosity of not less than 1.0 dL/g and less than 3.0 dL/g at 135°C in tetralin. (iv) The content of ethylene in component A<SB>1</SB>is not less than 60 mass% and less than 80 mass%, when the total amount of component A is made 100 mass%. COPYRIGHT: (C)2005,JPO&NCIPI
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