| abstract |
A polyester film comprising a coating layer whichncomprises organic fine particles and organic compounds onnone-side surface of the polyester film, the weight ratio ofnthe organic fine particles to the organic compounds in thencoating is 1:0.2 to 1:5.0, the diameters of surfacenprotrusions on the coating surface are 20 to 60 nm, thennumber of surface protrusions on the surface of the coatingnlayer is 3 million to 100 million per square millimeter, andnthe surface roughness Ra of the coating surface is 0.5 ton1.9 nm, is suitable as a base film of a recording mediumnhaving excellent image quality and excellent durabilitynwithout shaving an MR head. |