Color photographic element containing improved heterocyclic speed enhancing compound
AssigneeEastman Kodak Company
InventorsLouis E. Friedrich, Philip A. Allway, Judith A. Bogie, Bernard A. Clark, Charles E. Heckler, Stephen P. Singer
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Abstract
Disclosed is a color photographic element comprising at least one light sensitive silver halide emulsion layer containing a compound that does not react with oxidized developer, has a Log Kow high enough to improve speed, compared to the same layer without the compound, and comprises (1) a thiadiazole, or (2) an oxadiazole, or (3) a 1,2,4 triazole bearing an amido substituent, and does not contain a hydroxyl or thiol group or their tautomeric equivalents on the azole ring.
Claims38
A color photographic element comprising at least one light sensitive silver halide emulsion layer containing a compound that does not react with oxidized developer, has a Log Kow high enough to improve speed, compared to the same layer without the compound, and comprises
- (1) a thiadiazole, or
- (2) an oxadiazole, or
- (3) a 1,2,4 triazole bearing an amido substituent,
- and does not contain a hydroxyl or thiol group or their tautomeric equivalents on the azole ring.
A color photographic element comprising at least one light sensitive silver halide emulsion layer containing a compound that does not react with oxidized developer, has a Log Kow of at least 6.4, and comprises
- (1) a thiadiazole, or
- (2) an oxadiazole, or
- (3) a 1,2,4 triazole bearing an amido substituent, and does not contain a hydroxyl or thiol group or their tautomeric equivalents on the azole ring.
A color photographic element comprising at least one light sensitive silver halide emulsion layer containing a compound that does not react with oxidized developer, has a Log Kow high enough to improve speed after holding the melted silver halide emulsion layer containing the compound for one hour, compared to the same layer without the compound, and comprises
- (1) a thiadiazole, or
- (2) an oxadiazole, or
- (3) a 1,2,4 triazole bearing an amido substituent,
- and does not contain a hydroxyl or thiol group or their tautomeric equivalents on the azole ring.
Dependencies are inferred from the claim text.