Biaxially oriented polyester film, process for producing the same, and magnetic recording medium
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United States of America Patent
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Dec 28, 2004
Grant Date -
N/A
app pub date -
Jan 14, 2003
filing date -
Apr 19, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
The object of this invention is to provide a biaxially oriented polyester film suitable as a base film for high density magnetic recording media, small in track deviation and excellent in traveling durability and preservability, and to provide a production method thereof. The object of this invention can be achieved by a biaxially oriented polyester film, characterized in that the dimensional change rate (A) in the transverse direction of the film is in a range of -0.3 to 0% when the film is allowed to stand at 49.degree. C. and 90% RH for 72 hours, while being loaded with 32 MPa in the machine direction.
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