Photographic elements with reduced print-through
AssigneeE. I. Du Pont de Nemours and Company
InventorDietrich M. Fabricius
Life of this patent
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Abstract
A photographic element is detailed which provides for improved resolution by decreasing the blue and ultraviolet radiation typically associated with internal scatter and print-through. These and other improvements are provided in a photographic element comprising a support having thereon at least one hydrophilic colloid layer, and a radiation sensitive silver halide emulsion layer present as a portion of the colloid layer or in a separate layer wherein the emulsion contains a dye of the formula: ##STR1## wherein: A=counterion chosen from the set consisting of lithium, sodium, potassium, ammonium and alkylammonium and Z is a linking group.
Claims4
A dye of the formula ##STR7## wherein A is a counterion selected from the group consisting of lithium, sodium, potassium, ammonium, and alkylammonium;
- Z represents the elements necessary to form a five or six member ring chosen from the set consisting of cycloalkyl, cycloalkenyl, piperidine, pyrrolidine, furan, and thiophene.
A dye of formula ##STR8## wherein A is a counterion selected from the group consisting of lithium, sodium, potassium, ammonium, and alkylammonium;
- Z represents the elements necessary to form a five or six member ring chosen from the set consisting of 1,3-indandione, pyrazolone, 5,7-dioxo-6,7-dihydro-5-thiazolopyrimidine, 5,5-dialkyl1,3-cyclohexanedione, 2-hydroxy-4H-pyridopyrimidin-4-one.
A dye of the formula:
- ##STR9##
A dye of the formula ##STR10##
Dependencies are inferred from the claim text.