EP0338785A2
Expired / Lapsed
EP
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Photographic element containing scavenger for oxidized developing agent
Assignee: Eastman Kodak Co
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Filing: 1989-04-19
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Granted: —
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Expires: 2009-04-19
Abstract
Abstract A color photographic element comprising a support, at least one silver halide emulsion layer and a scavenger compound for oxidized developing agent characterized in that the scavenger compound is a hydrazine having the structural formula: wherein: R¹ represents an electron donating group; R² represents hydrogen, alkyl, alkoxy, aryl, aryloxy, aralkyl or amino of the formula -NHR³, where R³ is phenyl or benzyl; with the proviso that at least one of the substituents R¹ and R² (a) represents a ballast group of sufficient size as to render the hydrazide compound non-diffusible in the photographic element prior to development in alkaline processing solution and (b) comprises a polar group, and n is 0, 1 or 2, to prevent stain and fog formation in developed color images.
Inventors
- 👤 John William C/O Eastman Kodak Company Harder
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 21:29
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; G03C7/39236; C; C07; C07C; C07C243/00; C07C243/24; C07C243/38; C07C311/00; C07C311/01; C07C311/02; C07C311/08; C07C317/00; C07C317/16; C07C317/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A color photographic element comprising a support, at least one silver halide emulsion layer and a scavenger compound for oxidized developing agent characterized in that the scavenger compound is a hydrazine having the structural formula: wherein R¹ represents an electron donating group; R² represents hydrogen, alkyl, alkoxy, aryl, aryloxy, aralkyl or amino of the formula -NHR³, where R³ is phenyl or benzyl; with the proviso that at least one of the substituents R¹ and R² (a) represents a ballast group of sufficient size as to render the hydrazide compound non-diffusible in the photographic element prior to development in alkaline processing solution and (b) comprises a polar group, and n is 0, 1 or 2,
Claim 2
Dependent Claim
114 words
A color photographic element comprising a support, at least one silver halide emulsion layer and a scavenger compound for oxidized developing agent characterized in that the scavenger compound is a hydrazine having the structural formula: wherein R¹ represents an electron donating group; R² represents hydrogen, alkyl, alkoxy, aryl, aryloxy, aralkyl or amino of the formula -NHR³, where R³ is phenyl or benzyl; with the proviso that at least one of the substituents R¹ and R² (a) represents a ballast group of sufficient size as to render the hydrazide compound non-diffusible in the photographic element prior to development in alkaline processing solution and (b) comprises a polar group, and n is 0, 1 or 2,
Claim 3
Dependent Claim
22 words
The photographic element of claim 1 characterized in that the polar group has a π constant which is more negative than -1.0.
Claim 4
Dependent Claim
37 words
The photographic element of claim 1 or 2 characterized in that at least one R¹ substituent is an alkyl or alkoxy group having from 1 to 20 carbon atoms, or a carboxy, carbonamido, sulfonamido or amino group.
Claim 5
Dependent Claim
46 words
The photographic element of claim 3 characterized in that R¹ is a group of the formula -NR⁴COR⁵, -NR⁴SO₂R⁵ or -NR⁴R⁵ where R⁴ is hydrogen or alkyl of from 1 to 8 carbon atoms and R⁵ is as defined for R⁴ or a benzyl or phenyl group.
Claim 6
Dependent Claim
21 words
The photographic element of claim 3 characterized in that R¹ is alkyl or alkoxy having from 8 to 16 carbon atoms.
Claim 7
Dependent Claim
40 words
The photographic element of any of claims 1-5 characterized in that R² is alkyl or alkoxy having from 1 to 20, preferably 8 to 16 carbon atoms or an aryl or aryloxy having from 6 to 10 ring carbon atoms.
Claim 8
Dependent Claim
38 words
The photographic element of any of claims 1 - 6 characterized in that R² is phenyl or phenoxy optionally substituted with a hydrogen bonding group in a position ortho to the point of attachment of the carbonyl group.
Claim 9
Dependent Claim
65 words
The photographic element of claim 7 characterized in that the hydrogen bonding group is hydroxy, primary or secondary amino of the formula -NR⁴R⁵, sulfonamido of the formula -NHSO₂R⁴, carbonamido of the formula -NHCOR⁴ or ureido of the formula -NHCONHR⁴, where R⁴ is hydrogen or alkyl of from 1 to 8 carbon atoms and R⁵ is as defined for R⁴ or a benzyl or phenyl group.
Claim 10
Dependent Claim
45 words
The photographic element of any of claims 1 - 8 characterized in that the scavenger compound is present in a layer located between silver halide emulsion layers, in a layer comprising a color-forming agent or other photographic addenda, or in an overcoat or undercoat layer.
Claim 11
Dependent Claim
27 words
The photographic element of any of claims 1 - 9 characterized in that the scavenger compound is present in an amount of from 5 to 2000 mg/m².
Claim 12
Dependent Claim
22 words
The photographic element of claim 1, 9 or 10 characterized in that the scavenger compound has one of the following structural formulae:
References Cited (Backward Citations)
No citation records indexed.
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