| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydrolysis resistant polyester film that suppresses a rise in an acid value in film molding and has a low acid value.SOLUTION: A hydrolysis resistant polyester film is characterized in that: in a polyester resin composition constituting the film, the content of a hindered phenol structural unit is 0.03-6.7 equivalent/tons; a polyester constituting the film has an acid number of less than 25 equivalent/tons and an inherent viscosity of more than 0.64 dL/g and 0.90 dL/g or less; and the film has an apparent specific gravity of 0.7-1.3.SELECTED DRAWING: None |
