| 摘要 |
PROBLEM TO BE SOLVED: To provide a polypropylene resin composition which has excellent processability when stretched, high porosity, and excellent heat resistance when processed into a porous film, and to provide a porous film.SOLUTION: A polypropylene resin composition includes a polypropylene resin (component (A)) which meets all of the following requirement (1) and requirement (2), and 0.01-5 pts.wt. of beta crystal nucleating agent (component (B)) based on 100 pts.wt. of the component (A): requirement (1): a butene propylene random copolymer has 1-15 wt.% of a structural unit derived from butene (provided that the total weight of the butene propylene random copolymer is 100 wt.%) and requirement (2): total content of aluminum, magnesium, titanium, silicon and iron as measured with inductively coupled plasma emission spectrophotometer is 200 ppm or less. |
