US4756997A
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Photographic silver halide developer compositions and process for forming photographic silver images
Assignee: Carestream Health Inc
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Filing: 1987-07-21
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Granted: 1988-07-12
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Expires: 2007-07-21
Abstract
Abstract An aqueous alkaline photographic silver halide developer composition comprising a dihydroxy benzene developing agent, an auxiliary superadditive developing agent, an antifogging agent, an antioxidant and a buffering agent, characterized by the fact that the composition further comprises a stabilizing amount of an α-ketocarboxylic acid. The developer composition has a better resistance against air oxidation and can be left in continuous transport automatic processors for several days without undergoing any substantial decrease of its developing properties. The developer composition is particularly useful in a process for the formation of a high contrast silver image by developing silver halide photographic elements including at least a negative acting surface latent image type silver halide emulsion in the presence of a hydrazine compound, preferably in the additional presence of an effective amount of a contrast promoting agent.
Inventors
- 👤 Carlo Marchesano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:51
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
39 words
An aqueous alkaline photographic silver halide developer composition comprising a dihydroxybenzene developing agent, an auxiliary superadditive developing agent, an antifogging agent, an antioxidant compound and a buffering agent, characterized by containing a stabilizing amount of an α-ketocarboxylic acid compound.
Claim 2
Dependent Claim
39 words
An aqueous alkaline photographic silver halide developer composition comprising a dihydroxybenzene developing agent, an auxiliary superadditive developing agent, an antifogging agent, an antioxidant compound and a buffering agent, characterized by containing a stabilizing amount of an α-ketocarboxylic acid compound.
Claim 3
Dependent Claim
31 words
The photographic silver halide developer composition of claim 1 wherein the α-ketocarboxylic acid compound corresponds to the following formula: R--CO--COOH (I) wherein R represents a hydrogen atom or an organic group.
Claim 4
Dependent Claim
16 words
The photographic silver halide developer composition of claim 1 wherein said α-ketocarboxylic acid compound is HOOC--CO--COOH.
Claim 5
Dependent Claim
18 words
The photographic silver halide developer composition of claim 1 wherein said α-ketocarboxylic acid compound is H 3 C--CO--COOH.
Claim 6
Dependent Claim
25 words
The photographic silver halide developer composition of claim 1, wherein said auxiliary developing agent is selected in the class consisting of 3-pyrazolidone and p-aminophenol compound.
Claim 7
Dependent Claim
16 words
The photographic silver halide developer composition of claim 1, wherein the dihydroxybenzene developing agent is hydroquinone.
Claim 8
Dependent Claim
23 words
The photographic silver halide developer composition of claim 1, wherein the antifogging agents are selected within the group of the alkali metal halides.
Claim 9
Dependent Claim
25 words
The photographic silver halide developer composition of claim 1, wherein the antioxidant compounds are selected within the group of alkali metal sulphites and ascorbic acid.
Claim 10
Dependent Claim
24 words
The photographic silver halide developer composition of claim 1, wherein the antifogging agents are selected within the group consisting of benzotriazole and benzimidazole compounds.
Claim 11
Dependent Claim
25 words
The photographic silver halide developer composition of claim 1, wherein the buffering agents are selected within the group of alkali metal carbonates, borates and phosphates.
Claim 12
Dependent Claim
31 words
The photographic silver halide developer composition of claim 1, comprising a sequestering agent selected within the group consisting of aminopolycarboxylic acid compounds, α-hydroxycarboxylic acid compounds, dicarboxylic acid compounds and polyphosphate compounds.
Claim 13
Dependent Claim
13 words
The photographic silver halide developer composition of claim 1, comprising an alkanolamine compound.
Claim 14
Dependent Claim
53 words
The photographic silver halide developer composition of claim 1, comprising a hydroxymethylidine group containing compound of the following formula: ##STR10## wherein R 1 and R 2 each independently represents a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group, or R 1 and R 2 together complete a non-aromatic cyclic group.
Claim 15
Dependent Claim
152 words
A photographic silver halide developer composition comprising: (a) a dihydroxybenzene developing agent in an amount of 0.04 to 0.7 moles per liter; (b) an auxiliary developing agent in an amount of 0.0001 to 0.15 moles per liter; (c) an inorganic antifogging agent in an amount of 0.001 to 0.2 moles per liter; (d) an antioxidant compound in an amount of 0.001 to 1 moles per liter; (e) a buffering compound in an amount of 0.02 to 1 moles per liter; (f) a sequestering agent in an amount of 1×10 -4 to 0.2 moles per liter; (g) an organic antifogging agent in an amount of 1×10 -5 to 5×10 -2 moles per liter; (h) an α-ketocarboxylic acid compound in an amount of 5×10 -5 to 3×10 -1 moles per liter; (i) an inorganic alkali agent to have a pH in the range 9 to 13, and (l) water to make up one liter.
Claim 16
Dependent Claim
152 words
A photographic silver halide developer composition comprising: (a) a dihydroxybenzene developing agent in an amount of 0.04 to 0.7 moles per liter; (b) an auxiliary developing agent in an amount of 0.0001 to 0.15 moles per liter; (c) an inorganic antifogging agent in an amount of 0.001 to 0.2 moles per liter; (d) an antioxidant compound in an amount of 0.001 to 1 moles per liter; (e) a buffering compound in an amount of 0.02 to 1 moles per liter; (f) a sequestering agent in an amount of 1×10 -4 to 0.2 moles per liter; (g) an organic antifogging agent in an amount of 1×10 -5 to 5×10 -2 moles per liter; (h) an α-ketocarboxylic acid compound in an amount of 5×10 -5 to 3×10 -1 moles per liter; (i) an inorganic alkali agent to have a pH in the range 9 to 13, and (l) water to make up one liter.
Claim 17
Dependent Claim
168 words
A photographic silver halide developer composition comprising: (a) a dihydroxybenzene developing agent in an amount of 0.04 to 0.7 moles per liter; (b) an auxiliary developing agent in an amount of 0.0001 to 0.15 moles per liter; (c) an inorganic antifogging agent in an amount of 0.001 to 0.2 moles per liter; (d) an antioxidant compound in an amount of 0.001 to 1 moles per liter; (e) an alkanolamine compound in an amount of 0.009 to 0.85 moles per liter; (f) a buffering compound in an amount of 0.02 to 1 moles per liter; (g) a sequestering agent in an amount of 1×10 -4 to 0.2 moles per liter; (b) an organic antifogging agent in an amount of 1×10 -5 to 5×10 -2 moles per liter; (i) an α-ketocarboxylic acid compound in an amount of 5×10 -5 to 3×10 -1 moles per liter; (l) ) an inorganic alkali agent to have a pH in the range 10 to 12, and (m) water sufficient to make up one liter.
Claim 18
Dependent Claim
168 words
A photographic silver halide developer composition comprising: (a) a dihydroxybenzene developing agent in an amount of 0.04 to 0.7 moles per liter; (b) an auxiliary developing agent in an amount of 0.0001 to 0.15 moles per liter; (c) an inorganic antifogging agent in an amount of 0.001 to 0.2 moles per liter; (d) an antioxidant compound in an amount of 0.001 to 1 moles per liter; (e) an alkanolamine compound in an amount of 0.009 to 0.85 moles per liter; (f) a buffering compound in an amount of 0.02 to 1 moles per liter; (g) a sequestering agent in an amount of 1×10 -4 to 0.2 moles per liter; (b) an organic antifogging agent in an amount of 1×10 -5 to 5×10 -2 moles per liter; (i) an α-ketocarboxylic acid compound in an amount of 5×10 -5 to 3×10 -1 moles per liter; (l) ) an inorganic alkali agent to have a pH in the range 10 to 12, and (m) water sufficient to make up one liter.
Claim 19
Dependent Claim
210 words
A photographic silver halide developer composition comprising: (a) a dihydroxybenzene developing agent in an amount of 0.04 to 0.7 moles per liter; (b) an auxiliary developing agent in an amount of 0.0001 to 0.15 moles per liter; (c) an inorganic antifogging agent in an amount of 0.001 to 0.2 moles per liter; (d) an antioxidant compound in an amount of 0.001 to 1 moles per liter; (e) a hydroxymethylidine group containing compound of the following formula: ##STR11## wherein R 1 and R 2 each indipendently represent a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group or R 1 and R 2 together complete a non-aromatic cyclic group, in an amount of 0.001 to 3 moles per liter; (f) a buffering compound in an amount of 0.02 to 1 moles per liter; (g) a sequestering agent in an amount of 1×10 -4 to 0.2 moles per liter; (h) an organic antifogging agent in an amount of 1×10 -5 to 5×10 -2 moles per liter; (i) an α-ketocarboxylic acid compound in an amount of 5×10 -5 to 3×10 -1 moles per liter; (l) an inorganic alkali agent in an amount to have a pH in the range 10 to 12, and (m) water sufficient to make up one liter.
Claim 20
Dependent Claim
210 words
A photographic silver halide developer composition comprising: (a) a dihydroxybenzene developing agent in an amount of 0.04 to 0.7 moles per liter; (b) an auxiliary developing agent in an amount of 0.0001 to 0.15 moles per liter; (c) an inorganic antifogging agent in an amount of 0.001 to 0.2 moles per liter; (d) an antioxidant compound in an amount of 0.001 to 1 moles per liter; (e) a hydroxymethylidine group containing compound of the following formula: ##STR11## wherein R 1 and R 2 each indipendently represent a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group or R 1 and R 2 together complete a non-aromatic cyclic group, in an amount of 0.001 to 3 moles per liter; (f) a buffering compound in an amount of 0.02 to 1 moles per liter; (g) a sequestering agent in an amount of 1×10 -4 to 0.2 moles per liter; (h) an organic antifogging agent in an amount of 1×10 -5 to 5×10 -2 moles per liter; (i) an α-ketocarboxylic acid compound in an amount of 5×10 -5 to 3×10 -1 moles per liter; (l) an inorganic alkali agent in an amount to have a pH in the range 10 to 12, and (m) water sufficient to make up one liter.
Claim 21
Dependent Claim
31 words
A process for forming a black and white photographic silver image by development of a light-sensitive silver halide photographic element in an aqueous alkaline developer composition as claimed in claim 1.
Claim 22
Dependent Claim
45 words
A process according to claim 17 for forming a black and white high-contrast negative photographic silver image by development of a silver halide photographic element, including at least a negative acting surface latent image-type silver halide emulsion layer, in the presence of a hydrazine compound.
Claim 23
Dependent Claim
37 words
The process of claim 18 wherein the silver halide element is developed in the presence of a contrast promoting amount of a compound selected from the group consisting of an alkanolamine and a hydroxymethylidine group containing compounds.
Claim 24
Dependent Claim
19 words
The process of claim 18 wherein the hydroxymethylidine group containing compound is included in the silver halide developer composition.
Claim 25
Dependent Claim
50 words
The process of claim 18 wherein the hydroxymethylidine group containing compound corresponds to the following formula: ##STR12## wherein R 1 and R 2 each independently represent a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group, or R 1 and R 2 together complete a non-aromatic ciclic group.
Claim 26
Dependent Claim
19 words
The process of claim 18 wherein the hydroxymethylidine group containing compound is included in the silver halide photographic element.
Claim 27
Dependent Claim
67 words
The process of claim 22 wherein the hydroxymethylidine group containing compound is a diarylcarbinol compound according to one of the following formulas: R.sub.3 R.sub.4 R.sub.5 COH (III) R.sub.3 R.sub.4 R.sub.5 C(CH.sub.2).sub.m OH (IV) wherein R 3 and R 4 each represent an aryl group, R 5 represents a hydrogen atom, an alkyl group or an aryl group and m represents a positive integer from 0 to 4.
Claim 28
Dependent Claim
17 words
The process of claim 18 wherein the hydrazine compound is included in the silver halide photographic element.
Claim 29
Dependent Claim
36 words
The process of claim 24 wherein the hydrazine compound corresponds to the following formula: ##STR13## wherein R 14 represents an aryl group and R 15 represents a hydrogen atom, an alkyl group or an aryl group.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |