Dye precursors and their use in photographic materials and processes
AssigneeEastman Kodak Company
InventorRolf S. Gabrielsen
Life of this patent
Estimating the term…
Abstract
A diphenylamine compound that is a precursor for a phenazine dye comprises, in an ortho position to the amine of the diphenylamine, a sulfonyldiamido group (--NHSO.sub.2 NHR) that is capable of releasing a sulfonylamine fragment upon oxidation. The diphenylamine compound upon oxidation intramolecularly cyclizes to a phenazine dye. The sulfonylamine fragment is capable of thermally releasing ammonia or an amine. The diphenylamine compound and sulfonylamine fragment are useful in imaging such as in photothermography. Ammonia or an amine thermally released from the sulfonylamine fragment enables imaging in imaging materials that are responsive to ammonia or an amine. The diphenylamine compound also generally is a silver halide developing agent.
Claims29
In a photographic element comprising a support having thereon, in reactive association, in binder, photographic silver halide and a dye precursor, the improvement wherein,
- said dye precursor is a diphenylamine having, in an ortho position to the amine, a sulfonyldiamido group that is capable upon oxidation of said diphenylamine of releasing a sulfonylamine fragment which, in turn, is capable of thermally releasing ammonia or an amine and wherein said diphenylamine is capable upon oxidation of forming a phenazine dye.
In a photothermographic element comprising on a support, in binder, in reactive association, (a) photographic silver halide, (b) an organic silver salt oxidizing agent, and (c) a dye precursor,
- the improvement wherein,
- said dye precursor consists essentially of a diphenylamine having, in an ortho position to the amine, a sulfonyldiamido group that is capable upon oxidation of said diphenylamine of releasing a sulfonylamine fragment which, in turn, is capable of thermally releasing ammonia or an amine and wherein said diphenylamine is capable upon oxidation of forming a phenazine dye.
In a photothermographic element comprising on a support, in a poly(vinyl butyral) binder, in reactive association, (a) photographic silver halide, (b) a silver dodecyltetrazolate oxidizing agent, (c) a toner, and (d) a dye precursor,
- the improvement wherein,
- said dye precursor consists essentially of a compound selected from the group consisting of ##STR23## and combinations thereof.
In a photothermographic element comprising on a support, in a gelatino binder, in reactive association, (a) photographic silver halide, (b) a melt forming compound, and (c) a dye precursor,
- the improvement wherein,
- said dye precursor consists essentially of a diphenylamine having, in an ortho position to the amine, a sulfonyldiamido group that is capable upon oxidation of said diphenylamine of releasing a sulfonylamine fragment which, in turn, is capable of thermally releasing ammonia or an amine and wherein said diphenylamine is capable upon oxidation of forming a phenazine dye.
In a photothermographic element comprising on a support, in a gelatino binder, in reactive association, (a) photographic silver halide, (b) a melt forming compound consisting essentially of methyl urea, and (c) a dye precursor,
- the improvement wherein,
- said dye precursor consists essentially of N-[2-(4-N,N-diethylaminoanilino)-5-methanesulfonamidophenyl]sulfamide.
In a photographic composition comprising a photographic silver halide and a diphenylamine, the improvement wherein,
- said diphenylamine comprises, in an ortho position to the amine, a sulfonyldiamido group that is capable upon oxidation of said diphenylamine of releasing a sulfonylamine fragment which, in turn, is is capable of thermally releasing ammonia or an amine and wherein said diphenylamine is capable upon oxidation of forming a phenazine dye.
In a photothermographic composition comprising (a) photographic silver halide, (b) an organic silver salt oxidizing agent, and (c) a dye precursor,
- the improvement wherein,
- said dye precursor consists essentially of a diphenylamine having, in an ortho position to the amine, a sulfonyldiamido group that is capable upon oxidation of said diphenylamine of releasing a sulfonylamine fragment which, in turn, is capable of thermally releasing ammonia or an amine and wherein said diphenylamine is capable upon oxidation of forming a phenazine dye.
In a photothermographic composition comprising (a) photographic silver halide, (b) a silver dodecyltetrazolate oxidizing agent, (c) a toner, and (d) a dye precursor,
- the improvement wherein,
- said dye precursor consists essentially of a compound selected from the group consisting of ##STR26## and combinations thereof.
In a photothermographic composition comprising, in a gelatino binder, (a) photographic silver halide, (b) a melt forming compound, and (c) a dye precursor,
- the improvement wherein,
- said dye precursor consists essentially of a diphenylamine having, in an ortho position to the amine, a sulfonyldiamido group that is capable upon oxidation of said diphenylamine of releasing a sulfonylamine fragment which, in turn, is capable of thermally releasing ammonia or an amine and wherein said diphenylamine is capable upon oxidation of forming a phenazine dye.
In a photothermographic composition comprising, in a gelatino binder, (a) photographic silver halide, (b) a melt forming compound, and (c) a dye precursor,
- the improvement wherein,
- said dye precursor consists essentially of N-[2-(4-N,N-diethylaminoanilino)-5-methanesulfonamidophenyl]sulfamide.
Dependencies are inferred from the claim text.