Base film for photographic film

Details Base film for photographic film Base film for photographic film

G - Physics

03

C

G03C 1/795 (2006.01) G03C 1/81 (2006.01)

Patent

CA 2118252

-72- A base film for a photographic film, wherein (a) the refractive index (nz) in the thickness direction is at least 1.498, (b) the haze value is 2.0 % or less, (c) the base film has one direction in which the tan .delta. value, at 80°C by tensile viscoelasticity at 0.05 Hz, is 0.09 or less, (d) the anti-curling ratio at 70°C is at least 45 %, (e) the thickness is in the range of from 40 to 120 µm, and (f) the base film is formed from polyethylene-2,6-naphthalendedicarboxylate as a substantial raw material. This base film has various performances such as anti-curling properties, transparency and lubricity, suitable for use in a photographic film.

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