Solid particle dispersion filter dyes for photographic compositions
AssigneeEastman Kodak Company
InventorsDonald R. Diehl, Ronda E. Factor
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AssigneeEastman Kodak Company
InventorsDonald R. Diehl, Ronda E. Factor
Estimating the term…
Solid particle dispersions of dyes of the formula: [D-(A).sub.y ]-X.sub.n where D that comprises an aromatic ring if y is O, A is an aromatic ring bonded directly or indirectly to D, X is a substituent, other than carboxy, having an ionizable proton, either on A or on an aromatic ring portion of D, having a pKa of about 4 to 11 in a 50/50 mixture (volume basis) of ethanol and water, y is 0 to 4, n is 1 to 7, and the compound has a log partition coefficient of from about 0 to 6 when the compound is in unionized form, are disclosed for filter dye layers of photographic elements. They may be coated in layers of photographic elements without a mordant, and they do not wander at coating pH's. At processing pH's, however, they are solubilized for easy removal and/or decolorization.
A photographic element comprising a support having thereon a radiation-sensitive silver halide emulsion layer and a hydrophilic filter dye layer comprising a hydrophilic binder and an amount effective as a photographic filter dye of a dispersion of solid particles having a mean diameter of from about 0.01 to 10 mm, said particles consisting essentially of a filter dye having the formula:
Dependencies are inferred from the claim text.