Base film for photographic films

Details Base film for photographic films Base film for photographic films

G - Physics

03

C

G03C 1/795 (2006.01)

Patent

CA 2218920

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°C and showing an endothermic energy of 0.3 mJ/mg or more.

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