BIAXIALLY ORIENTED POLYESTER FILM AND MAGNETIC RECORDING TAPE

摘要

This invention provides a biaxially oriented polyester film, which has a Young's modulus (YMD) in a film formation direction of not less than 6.5 GPa and a Young's modulus (YTD) in a widthwise direction of 8.2 to 9.8 GPa and is suitable for use as a base film in a magnetic recording tape for a linear recording system, and a magnetic recording tape for a linear recording system, using the biaxially oriented polyester film as a base film. The biaxially oriented polyester film has excellent dimensional stability, particularly dimensional stability in the widthwise direction.