| 摘要 |
<p>PURPOSE:To enhance the electromagnetic conversion characteristic, wear resistance, running quality, etc. of the titled film, by putting the respective relations and the mean refractive index of the number of the surface projections and the mean height, and the mean steepness and the square-law mean projection height, within the respective specific range. CONSTITUTION:The surface condition and the refractive index of a polyester film to be used for the magnetic tape satisfy the expression I, expression II and expression III. As for the polyester film having such characteristics as mentioned above, wear resistance in the process of making a tape, adhesiveness of the magnetic layer, and also electromagnetic conversion characteristic, wear resistance, running quality, etc. of a product tape are improved simultaneously.</p> |
