| 摘要 |
A polyester film for magnetic recording media includes a coating layer containing fine particles and organic compounds formed on surface A at one side of the polyester film, and fine surface protrusions formed at a density of 3x106 to 1x108 protrusions/mm2 on surface A. The polyester film satisfies at least one of the following conditions: (a) the mean diameter of the fine surface protrusions is in the range of 5 to 60 nm, and, among the fine surface protrusions, the density of fine surface protrusions with a height of 20 nm or more is 3,000 protrusions/mm2, and (b) the mean diameter of the fine surface protrusions is in the range of 5 to 100 nm, the mean height of the fine surface protrusions is in the range of 5 to 30 nm, and the degree of cohesion of the fine surface protrusion is less than 15%.
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