| 摘要 |
<p>A biaxially oriented polyester film containing 0.01 to 4 wt%, based on the polyester film, of inorganic particles, the volumetric shape parameter being 0.02 to 0.20, the weight-average particle size being 0.05 to 3 mu m, and the ratio (Dw/Dn) of the weight-average particle size (Dw) and the number-average particle size (Dn) being not more than 1.10 is disclosed. The film of the present invention has a uniform surface and shows excellent running property and wear resistance so that it is useful as a base film for a magnetic tape, for example. Thus, the film of the present invention has a high industrial value.</p> |
