Silver halide photographic elements
AssigneeMinnesota Mining and Manufacturing Company
InventorsIvano Delprato, Stefano Mana, Antonio Luzzi
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Abstract
An infrared sensitive silver halide photographic element which contains an infrared-absorbing dye represented by the following formula ##STR1## wherein: R.sub.1 and R.sub.2 each independently represents a sulfoalkyl or a sulfatoalkyl group, Q represents the atoms necessary to complete a 5- to 6- membered carbocyclic ring, Z.sub.3 represents the atoms necessary to complete a 5-membered N-containing aromatic ring, X.sup.- represents an anion, n is an integer of 1 or 2, provided that n is 1 when the dye forms an intramolecular salt, and Z.sub.1 and Z.sub.2 each independently represents the atoms necessary to complete a substituted or unsubstituted indole nucleus.
Claims10
A silver halide photographic element comprising a support, at least one infrared sensitive silver halide emulsion photosensitive layer and at least one hydrophilic colloid non photosensitive layer wherein at least one of said layers contains an infrared absorbing amount of a dye represented by the following formula ##STR18## wherein R.sub.1 and R.sub.2 each independently represents a sulfoalkyl or a sulfatoalkyl group having 2 to 4 carbon atoms,
- Q represents the atoms necessary to complete a 5- to 7-membered substituted or unsubstituted carbocyclic ring,
- Z.sub.3 represents the atoms necessary to complete a substituted or unsubstituted 5-membered N-containing aromatic ring selected from the group consisting of pyrazole, triazole, imidazole, and pyrrole groups,
- X.sup.- represents an anion,
- n is an integer of 1 or 2, provided that n is 1 when the dye forms an intramolecular salt, and
- Z.sub.1 and Z.sub.2 each independently represents the atoms necessary to complete a substituted or unsubstituted indole nucleus.
Dependencies are inferred from the claim text.