Emulsion composition to control film core-set
AssigneeEastman Kodak Company
InventorsJehuda Greener, Yongcai Wang, Gary W. Visconte
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Abstract
A photographic film comprising a base layer and at least one emulsion layer, the emulsion layer having a melting temperature that is within 4 degrees centigrade of the incubation temperature used in an accelerated core-set test.
Claims9
A photographic film comprising a base layer and at least one emulsion layer, the emulsion layer having a melting temperature that is within 4 degrees centrigrade of the incubation temperature used in a standard accelerated core-set test;
- wherein the ratio of emulsion layer thickness, tc, to base layer thickness, tb, ≦0.15;
- and
- wherein the incubation temperature in the standard accelerated core-set test is about 80° C.
A photographic film comprising a base layer and at least one emulsion layer, the emulsion layer containing a humectant at a concentration sufficient to suppress the melting temperature as measured by differential scanning calorimetry, at a temperature that is within 4 degrees centrigrade of the incubation temperature used in a standard accelerated core-set test;
- wherein the ratio of emulsion layer thickness, tc, to base layer thickness, tb, ≦0.15;
- and
- wherein the incubation temperature in the standard accelerated core-set test is about 80° C.
A method of reducing the core set of an imaging film, comprising:
- a) providing a film with an emulsion layer and a base layer, wherein the ratio of emulsion layer thickness, te;
- to base layer thickness, tb;
- ≦0.15;
- b) winding the film on a core;
- c) incubating the wound film at about 80° C. for about 2 hours;
- d) terminating the incubation and equilibrating the film at ambient temperature;
- e) measuring the core set;
- and
- f) lowering the core set by adjusting the melt temperature of the emulsion layer to within 4° C. of the temperature during incubation.
Dependencies are inferred from the claim text.