Patent Number: 6,165,701

Title: Base film for photographic films

Abstract: A base film for photographic films formed from a copolyester comprising 97 to 100 mol % of 2,6-naphthalenedicarboxylic acid and 0 to 3 mol % of a dicarboxylic acid other than 2,6-naphthalenedicarboxylic acid and (i) 87 to 99.8 mol % of ethylene glycol, 0.2 to 10 mol % of bis[4-(.omega.-hydroxyalkoxy)phenyl]sulfone and 0 to 3 mol % of a glycol other than ethylene glycol and bis[4-(.omega.-hydroxyalkoxy)phenyl]sulfone or (ii) 97 to 100 mol % of ethylene glycol, 0 to 3 mol % of a diol other than ethylene glycol and 1 to 7 mol % of an oxycarboxylic acid. This base film has an endothermic peak having a peak top temperature, measured by a differential scanning calorimeter, of 120 to 160.degree. C. and showing an endothermic energy of 0.3 mJ/mg or more.

Inventors: Teramoto; Mitsuru (Matsuyama, JP), Kimura; Manabu (Matsuyama, JP), Watanabe; Shinya (Sagamihara, JP), Furuya; Koji (Sagamihara, JP), Suzuki; Kenji (Sagamihara, JP)

Assignee: Teijin Limited

International Classification: G03C 1/795 (20060101); G03C 001/795 ()

Expiration Date: 12/26/2013