Solid particle dispersions of filter dyes for photographic elements
AssigneeEastman Kodak Company
InventorsDonald R. Diehl, Glenn M. Brown
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AssigneeEastman Kodak Company
InventorsDonald R. Diehl, Glenn M. Brown
Estimating the term…
Solid particle dispersions of dyes according to the formula: ##STR1## wherein D is selected from the group consisting of ##STR2## are disclosed as filter dyes for photographic elements. In this formula, R.sup.1, R.sup.2, and R.sup.3 are each independently hydrogen, substituted or unsubstituted alkyl, or substituted or unsubstituted alkoxy. At least one of R.sup.1, R.sup.2 and R.sup.3 is substituted or unsubstituted alkoxy, or two of R.sup.1, R.sup.2 and R.sup.3 together consist of --O--L--O-- and form a ring condensed with the phenyl ring to which they are attached wherein L is an alkylene linking group. R.sup.4, R.sup.5, R.sup.6, and R.sup.7 are each independently hydrogen, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl. R is a carboxy or sulfonamido substituent, and L.sup.1, L.sup.2 and L.sup.3 are each independently substituted or unsubstituted methine groups. The dyes of the invention are particularly useful as filter dyes for light in the ultraviolet and short blue wavelength regions of the spectrum.
A photographic element comprising a support having thereon a radiation-sensitive layer and a hydrophilic layer coated at a pH of 6 or less, which is the same or different from the radiation-sensitive layer, comprising a hydrophilic binder and a filter dye, where the filter dye has the formula:
A photographic element comprising a support having thereon a radiation-sensitive layer and a hydrophilic layer coated at a pH of 6 or less, which is the same as or different from the radiation-sensitive layer, comprising a hydrophilic binder and a filter dye, wherein the filter dye has the formula:
Dependencies are inferred from the claim text.