| abstract |
A biaxially orientated polyester film having minute recesses based on organic particles on its surface, wherein an average diameter of the recesses is from 0.1 to 7 µm, a standard deviation of the average diameter of the recesses is from 1 to 2.0, and an area ratio of the recesses to the whole surface area of the film is from 0.05 to 10 %, which has good abrasion resistance and slip properties and is suitable as a base film of a magnetic recording medium. |