EP0284239A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Photographic silver halide materials and process comprising a pyrazoloazole coupler
Assignee: Eastman Kodak Co
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Filing: 1988-03-08
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Granted: —
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Expires: 2008-03-08
Abstract
Abstract Novel pyrazoloazole couplers comprise an aryl or heterocyclic group having, in at least one of the ortho positions to the carbon atom (A) that is bonded to the pyrazoloazole nucleus, a substituent (B) that enables the pyrazoloazole couplers to form a magenta dye that has increased stability and has absorption controllably shifted, that is shifted hypsochromically relative to a dye formed from a similar coupler lacking substituent (B). These couplers are useful in photographic silver halide materials and processes.
Inventors
- 👤 Arlyce Tolman Bowne
- 👤 Sharon Eileen Normandin
- 👤 Nigel Edgewick Dr. Milner
- 👤 David Dr. Clarke
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 05:18
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; G03C7/30511; G03C7/30517; G03C7/30529; G03C7/32; G03C7/36; G03C7/38; G03C7/381; G03C7/382; G03C7/3825; G03C7/3835
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
A photographic silver halide material comprising a support bearing at least one photographic silver halide emulsion layer and in or adjacent the emulsion layer a dye-forming pyrazoloazole coupler having an aryl or heterocyclic group comprising (I) a carbon atom (A) that is directly bonded to the pyrazoloazole nucleus and (II) an alkyl, alkoxy or halogen substituent (B) in at least one position ortho to the carbon atom (A) with the proviso that when substituent (B) is in the 3-position of a 1H-pyrazolo(3,2-c)-s-triazole nucleus it may only represent an alkyl or alkoxy group.
Claim 2
Dependent Claim
92 words
A photographic silver halide material comprising a support bearing at least one photographic silver halide emulsion layer and in or adjacent the emulsion layer a dye-forming pyrazoloazole coupler having an aryl or heterocyclic group comprising (I) a carbon atom (A) that is directly bonded to the pyrazoloazole nucleus and (II) an alkyl, alkoxy or halogen substituent (B) in at least one position ortho to the carbon atom (A) with the proviso that when substituent (B) is in the 3-position of a 1H-pyrazolo(3,2-c)-s-triazole nucleus it may only represent an alkyl or alkoxy group.
Claim 3
Dependent Claim
50 words
A photographic silver halide material as claimed in claim 1 wherein the aryl or heterocyclic group having a carbon atom (A) is represented by the formula: wherein R₁ is as defined in claim 1; and, Q represents the atoms necessary to complete an unsubstituted or substituted aryl or heterocyclic group.
Claim 4
Dependent Claim
31 words
A photographic silver halide material as claimed in claim 1 or 2 wherein the pyrazoloazole coupler is a 1H-pyrazolo[3,2-c]-s-triazole substituted in the 3- or 6-position with the aryl or heterocyclic group.
Claim 5
Dependent Claim
28 words
A photographic silver halide material as claimed in claim 3 wherein the 1H-pyrazolo-[3,2-c]-s-triazole coupler contains in the 3- or 6-position an ortho-substituted phenyl group selected from the following:
Claim 6
Dependent Claim
21 words
A photographic silver halide material as claimed in claim 1 wherein the pyrazoloazole coupler is a compound selected from the following:
Claim 7
Dependent Claim
16 words
A photographic silver halide material as in claim 1 in which the coupler has the formula:
Claim 8
Dependent Claim
72 words
A multicolor photographic silver halide material as claimed in any of claims 1-6 comprising a red-sensitive silver halide emulsion unit having associated therewith a cyan dye image providing material, a green-sensitive silver halide emulsion unit having associated therewith a magenta dye image-providing material, and a blue-sensitive silver halide emulsion unit having associated therewith a yellow dye image-providing silver halide material wherein the pyrazoloazole coupler is in at least one of said units.
Claim 9
Dependent Claim
35 words
A process of forming a magenta dye image in an exposed photographic material as defined in any of claims 1-7, said process comprising developing the exposed photographic material with a silver halide color developing agent.
Claim 10
Dependent Claim
11 words
A dye-forming pyrazoloazole coupler as defined in any of claims 1-6.
Claim 11
Dependent Claim
18 words
A 1H-pyrazolo[3,2-c]-s-triazole containing in the 3- or 6-position an ortho-substituted phenyl group selected from the group consisting of
Claim 12
Dependent Claim
18 words
A 1H-pyrazolo[3,2-c]-s-triazole containing in the 3- or 6-position an ortho-substituted phenyl group selected from the group consisting of
Claim 13
Dependent Claim
8 words
A 1H-pyrazolo[3,2-c]-s-triazole selected from the group consisting of
Claim 14
Dependent Claim
8 words
A 1H-pyrazolo[3,2-c]-s-triazole selected from the group consisting of
References Cited (Backward Citations)
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