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US 5,707,794 AGranted
Spectral sensitization of silver halide photographic elements
AssigneeSterling Diagnostic Imaging, Inc.
InventorDietrich Max Fabricius
Life of this patent
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Abstract
Improved spectral sensitization with a synergistic combination of dyes is described. The two dyes include a first sensitizing dye is represented by Formula 1. ##STR1## and a second dye represented by Formula 2. ##STR2## The substituents of are defined in the description.
Claims18
A photographic element comprising a support with at least one hydrophilic colloid layer coated thereon;
- said hydrophilic colloid layer comprises silver bromide grains with up to 5% iodide, by weight, which are spectrally sensitized with at least one first dye represented by ##STR18## wherein:
- R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently represents H, halogen, alkyl, aryl, alkoxy, carbonyl or sulfonate, or R.sup.1 and R.sup.2 or R.sup.2 and R.sup.3 or R.sup.3 and R.sup.4 are taken together to represent the atoms necessary to complete a six-membered carbocylic ring;
- X.sup.1 represents O, S, CH=CH, Se, Te, N--R.sup.7, or C--R.sup.8 R.sup.9 ;
- R.sup.5 represents alkyl or aryl;
- R.sup.6 represents H, alkyl or aryl;
- and
- R.sup.7, R.sup.8 and R.sup.9 each independently represents alkyl;
- and at least one second dye represented by ##STR19## wherein:
- R.sup.10, R.sup.11, R.sup.12, and R.sup.13 each independently represents H, halogen, alkyl, aryl, alkoxy, carbonyl or sulfonate or R.sup.10 and R.sup.11 or R.sup.11 and R.sup.12 or R.sup.12 and R.sup.13 are taken together to represent the atoms necessary to complete a six-membered carbocylic ring;
- X.sup.2 represents O, S, CH=CH, Se, Te, N--R.sup.16, C--R.sup.17 R.sup.18 ;
- R.sup.14 represents alkyl or aryl;
- R.sup.15 represents H, alkyl or aryl;
- R.sup.16 represents alkyl;
- and
- R.sup.17 and R.sup.18 each independently represents alkyl.
12 more elements
A photographic element comprising a support with at least one hydrophilic colloid layer coated thereon;
- said hydrophilic colloid layer comprises silver halide grains which are spectrally sensitized with at least one first dye represented by:
- ##STR22## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each independently represents H, halogen, alkyl, aryl, alkoxy, carbonyl, or sulfonate, or R.sup.1 and R.sup.2 or R.sup.2 and R.sup.3 or R.sup.3 and R.sup.4 are taken together to represent the atoms necessary to complete a six-membered carbocylic ring;
- X represents O, S, CH=CH, Se, Te, N--R.sup.7, or C--R.sup.8 R.sup.9 ;
- R.sup.5 represents alkyl or aryl;
- R.sup.6 represents H, alkyl or aryl;
- R.sup.7 represents alkyl;
- and
- R.sup.8 and R.sup.9 each independently represents alkyl;
- and at least one second dye represented by ##STR23## wherein R.sup.10, R.sup.11, and R.sup.12 each independently represents H, alkyl, or aryl, or R.sup.11 and R.sup.12 are taken together to represent the atoms necessary to complete a five-membered or six-membered heterocyclic ring;
- and
- R.sup.13 represents H, alkyl or aryl.
8 more elements
A photographic element comprising a support with at least one hydrophilic colloid layer coated thereon;
- said hydrophilic colloid layer comprises silver halide grains which are spectrally sensitized with at least one first dye represented by ##STR26## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each independently represents H, halogen, alkyl, aryl, alkoxy, carbonyl, or sulfonate, or R.sup.1 and R.sup.2 or R.sup.2 and R.sup.3 or R.sup.3 and R.sup.4 are taken together to represent the atoms necessary to complete a six-membered carbocylic ring;
- X represents O, S, CH=CH, Se, Te, N--R.sup.7, C--R.sup.8 R.sup.9 ;
- R.sup.5 represents alkyl or aryl;
- R.sup.6 represents H, alkyl or aryl;
- R.sup.7 represents alkyl;
- and
- R.sup.8 and R.sup.9 each independently represents alkyl;
- and at least one second dye represented by ##STR27## wherein R.sup.10, R.sup.11, R.sup.12, R.sup.13, R.sup.14, and R.sup.15 each independently represents H, alkyl, and aryl;
- or R.sup.10 and R.sup.11 or R.sup.11 and R.sup.12 or R.sup.10 and R.sup.15 are taken together to represent the atoms necessary to complete a five- or six-membered heterocyclic ring or R.sup.12 and R.sup.13 or R.sup.14 and R.sup.15 are taken together to represent the atoms necessary to complete a five- or six-membered carbocylic ring;
- R.sup.16 represents H, alkyl or aryl;
- and
- R.sup.17 represents H, alkyl or aryl.
9 more elements
Dependencies are inferred from the claim text.