Teijin Limited

Hiromichi Ito

Tatsuya Ogawa

Yoshitaka Tanaka

Toshio Ishidera

Disclosed are a biaxially oriented polyester film which is excellent in dimensional stability, especially dimensional stability against environmental changes in, for example, temperature and humidity, and a polyester capable of providing the biaxially oriented polyester film with excellent dimensional stability. There is provided a copolymerized aromatic polyester containing aromatic dicarboxylic acid components represented by the following formulae (I) and (II) and a glycol component represented by the following formula (III), wherein  In the structural formulae (I) to (III), Rrepresents an alkylene group having 1 to 10 carbon atoms; Rrepresents a phenylene group or a naphthalenediyl group; and Rrepresents an alkylene group having 2 to 4 carbon atoms or a cycloalkylene group having 8 to 10 carbon atoms.

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Ehime, Japan

Hiromichi Ito