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公开(公告)号:US06984435B2
公开(公告)日:2006-01-10
申请号:US10331723
申请日:2002-12-27
申请人: Jun Kobayashi , Eiji Doi , Masanobu Dobuchi
发明人: Jun Kobayashi , Eiji Doi , Masanobu Dobuchi
IPC分类号: B32B5/30
CPC分类号: G11B5/7315 , B32B3/26 , B32B27/36 , G11B5/7305 , Y10T428/24355 , Y10T428/24372 , Y10T428/24612 , Y10T428/2495 , Y10T428/31786
摘要: A biaxially oriented, laminated polyester film having at least two layers, and in the film, an irregularity in film thickness determined within 4 mm width at an arbitrary position in a transverse direction of the film is about 0.1 μm or less. This polyester film can satisfy both the electromagnetic conversion property and the running ability at a high level, particularly when the film is used as a base film for a large capacity tape for data storage.