| abstract |
When the maximum height roughness of one side of the biaxially oriented polypropylene film is Sz1 and the maximum height roughness of the other side is Sz2 (also called Sz1 ≦ Sz2), Sz1 is 50 to 500 nm, and at least one side is long Biaxially orientated polypropylene film in which projections having a height of 10 µm or less and a height of 50 to 200 nm exist in 100 µm x 100 µm at five or more frequencies. The polypropylene film which is excellent in surface smoothness and transparency, and excellent in sliding property, handling property, and winding property is provided. |