Back to results
US 5,288,715 AGranted
Light sensitive silver halide element with cellulose ester film base
AssigneeEastman Kodak Company
InventorsJulie S. Machell, I. Daniel Sand
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeEastman Kodak Company
InventorsJulie S. Machell, I. Daniel Sand
Estimating the term…
A cellulose ester film which can be melt cast is manufactured by esterfying cellulose to form a cellulose acetate or cellulose acetate propionate having degrees of substitution of DSac=1.9 to 2.6, DSpr=0 to 0.9 and DS.sub.OH =0 to 0.55 and melt compounding the resulting polymer with a non-volatile phosphoric acid ester. A film is formed by melt extruding the compounded polymer onto a cooling surface to form a solid film. The film is then biaxially oriented at 130.degree. to 200.degree. C. and a stretch ratio of 1.25x to 2.5x in both directions. The resulting product is a film of excellent properties such as surface smoothness, light transmission, low haze, low color, high elastic modulus and curl relaxation after aqueous processing. The melt cast film is useful as a photographic roll film to replace solvent cast cellulose triacetate.
A photographic element comprising at least one aqueous-processable, light sensitive layer coated on a film support which is a biaxially oriented, melt-cast cellulose ester film comprising a cellulose acetate or a cellulose acetate propionate having degrees of substitution in the ranges DS.sub.ac =1.90 to 2.60, DS.sub.pr =0 to 0.9 and DS.sub.OH =0 to 0.55, melt compounded with a non-volatile phosphoric acid ester, said film being biaxially oriented to a stretch ratio from 1.25X to 2.5X in both directions of orientation, and said oriented film having a yellowness index less than 4, a percent haze less than 2, an elastic modulus greater than 3.1 GPa and post-processing curl less than 2 mm.sup.-1.
Dependencies are inferred from the claim text.