Photographic element and process comprising a dye releasing group
AssigneeEastman Kodak Company
InventorsJared B. Mooberry, Stephen P. Singer
Life of this patent
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Abstract
A new photographic coupler comprises a coupling-off group bonded to the coupler at the coupling position represented by the formula: --L--NR.sup.1 --DYE wherein L is a linking group; NR.sup.1 is a substituted nitrogen atom bonded to DYE that together with NR.sup.1 is a releasable dye comprising an electrically neutral chromophore. Such a coupler enables dye hue stabilization without mordanting the dye formed. Such a new coupler is useful in a photographic silver halide element and process to provide increased dye density, higher contrast dye images, and lower pH sensitivity upon processing.
Claims10
A photographic element comprising a support bearing a silver halide photographic emulsion and a coupler having a coupling-off group bonded to the coupler at the coupling position wherein the coupling-off group is represented by the formula:
- ##STR92## wherein L is a linking group cleavable from ##STR93## after coupling-off and contains --B-- bonded to ##STR94## wherein --B-- is ##STR95## is a substituted nitrogen atom bonded to DYE that together with the substituted nitrogen atom is a releasable dye comprising an electrically neutral chromophore;
- wherein the linking group enables a spectral shift in absorption of DYE.
Dependencies are inferred from the claim text.