| 摘要 |
The invention relates to a three-layer, biaxially oriented polyester film which has better abrasion properties than prior art films, together with very good electromagnetic properties. The structure on the two sides of the film in composed of at least one base layer B and, applied to this base layer, outer layers A and C, wherein the outer layer A has a roughness gas flow greater than 1000 sec and less than 2000 sec, and the outer layer C has a roughness profile gas flow of less than 600 sec. The invention further relates to a process for producing the film, and to its use as a magnetic tape film.
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