US4923787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic element containing scavenger for oxidized developing agent
Assignee: Eastman Kodak Co
•
Filing: 1989-05-12
•
Granted: 1990-05-08
•
Expires: 2009-05-12
Abstract
Abstract A photographic element is described which comprises a compound capable of scavenging oxidized developing agent to prevent stain and fog formation in developed color images.
Inventors
- 👤 John W. Harder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:29
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: 18
Claim 1
Independent Claim
130 words
A color photographic element comprising a support, at least one silver halide emulsion layer and a scavenger compound for oxidized developing agent wherein the scavenger compound is a hydrazine having the structural formula: ##STR11## wherein: R 1 represents an electron donating group; R 2 represents hydrogen, alkyl, alkoxy, aryl, aryloxy, aralkyl or amino of the formula --NHR 3 , where R 3 is phenyl or benzyl; with the proviso that at least one of the substituents R 1 and R 2 (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 having a π constant which is more negative than -1.0, and n is 0, 1 or 2.
Claim 2
Dependent Claim
130 words
A color photographic element comprising a support, at least one silver halide emulsion layer and a scavenger compound for oxidized developing agent wherein the scavenger compound is a hydrazine having the structural formula: ##STR11## wherein: R 1 represents an electron donating group; R 2 represents hydrogen, alkyl, alkoxy, aryl, aryloxy, aralkyl or amino of the formula --NHR 3 , where R 3 is phenyl or benzyl; with the proviso that at least one of the substituents R 1 and R 2 (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 having a π constant which is more negative than -1.0, and n is 0, 1 or 2.
Claim 3
Dependent Claim
35 words
The photographic element of claim 1 wherein at least one R 1 substituent is an alkyl or alkoxy group having from 1 to about 20 carbon atoms, or a carboxy, carbonamido, sulfonamido or amino group.
Claim 4
Dependent Claim
48 words
The photographic element of claim 2 wherein R 1 is carbonamido of the formula --NR 4 COR 5 where R 4 is hydrogen or alkyl of from 1 to about 8 carbon atoms and R 5 is as defined for R 4 or a benzyl or phenyl group.
Claim 5
Dependent Claim
49 words
The photographic element of claim 2 wherein R 1 is sulfonamido of the formula NR 4 SO R 5 where R 5 is hydrogen or alkyl of from 1 to about 8 carbon atoms and R 5 is as defined for R 4 or a benzyl or phenyl group.
Claim 6
Dependent Claim
47 words
The photographic element of claim 2 wherein R 1 is amino of the formula --NR 4 R 5 wherein R 4 is hydrogen or alkyl of from 1 to about 8 carbon atoms and R 5 is as defined for R 4 or is benzyl or phenyl.
Claim 7
Dependent Claim
22 words
The photographic element of claim 2 wherein R 1 is alkyl or alkoxy having from about 8 to about 16 carbon atoms.
Claim 8
Dependent Claim
21 words
The photographic element of claim 1 wherein R 2 is alkyl or alkoxy having from 1 to about 20 carbon atoms.
Claim 9
Dependent Claim
22 words
The photographic element of claim 7 wherein R 2 is alkyl or alkoxy having from about 8 to about 16 carbon atoms.
Claim 10
Dependent Claim
22 words
The photographic element of claim 1 wherein R 2 is aryl or aryloxy having from 6 to about 10 ring carbon atoms.
Claim 11
Dependent Claim
13 words
The photographic element of claim 1 wherein R 2 is phenyl or phenoxy.
Claim 12
Dependent Claim
37 words
The photographic element of claim 10 wherein the phenyl or phenoxy ring is substituted with a hydrogen bonding group in a position ortho to the point of attachment of the carbonyl group to a hydrazide nitrogen atom.
Claim 13
Dependent Claim
78 words
The photographic element of claim 11 wherein the hydrogen bonding group is hydroxy, primary or secondary amino of the formula --NR 4 R 5 , sulfonamido of the formula NHSO 2 R 4 , carbonamido of the formula --NHCOR 4 or ureido of the formula --NHCONHR 4 , where R 4 is hydrogen or alkyl of from 1 to about 8 carbon atoms and R 5 is as defined for R 4 or a benzyl or phenyl group.
Claim 14
Dependent Claim
40 words
The photographic element of claim 1 wherein 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 15
Dependent Claim
25 words
The photographic element of claim 1 wherein the scavenger compound is present in an amount of from about 5 to about 2000 mg/m 2 .
Claim 16
Dependent Claim
15 words
The photographic element of claim 1 wherein the scavenger compound has the structural formula: ##STR12##
Claim 17
Dependent Claim
15 words
The photographic element of claim 1 wherein the scavenger compound has the structural formula: ##STR13##
Claim 18
Dependent Claim
14 words
The photographic element of claim 1 wherein the scavenger compound has the structural formula:
References Cited (Backward Citations)
US3700453A
Cited
US4224401A
Cited
US4650746A
Cited
US4205987A
Cited
US4269929A
Cited
US4684604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |