| abstract |
An object of the present invention is to provide anhigh-quality biaxially oriented film exhibiting an excellentnelectromagnetic conversion property, traveling durability,nmagnetic head traveling performance, etc. as a magneticnrecording medium. n The object of the present invention is achieved by anbiaxially oriented film including a polymer alloy composednof polyester (polymer 1) and a thermoplastic resin (polymern2) other than the polyester as essential components, whereinnmicro protrusions having a height of 2 to 50 nm are formednat a density of 1,000,000 to 90,000,000/mm 2 on at least onensurface. |