US5455155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic element having reduced dye stain
Assignee: Eastman Kodak Co
•
Filing: 1994-02-18
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Granted: 1995-10-03
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Expires: 2014-02-18
Abstract
Abstract Undesirable dye stain in a photographic element containing a disulfonamidophenol oxidized developer scavenger can be significantly reduced when the disulfonamidophenol scavenger is in the form of a crystalline solid particle dispersion prepared by milling crystalline solid particles of the scavenger in an aqueous medium in the presence of a dispersing agent and in the substantial absence of an organic solvent.
Inventors
- 👤 Mary C. Brick
- 👤 Norma B. Platt
- 👤 Paul L. Zengerle
- 👤 Jeffery L. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:34
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; G03C7/39212; G03C7/39216
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A photographic element comprising a support having thereon at least one silver halide emulsion layer, and a layer, which is the same or different from the silver halide layer, comprising disulfonamidophenol oxidized developer scavenger dispersed in an aqueous medium, wherein the dispersed disulfonamidophenol oxidized developer scavenger consists essentially of disulfonamidophenols in solid particle crystalline form.
Claim 2
Dependent Claim
55 words
A photographic element comprising a support having thereon at least one silver halide emulsion layer, and a layer, which is the same or different from the silver halide layer, comprising disulfonamidophenol oxidized developer scavenger dispersed in an aqueous medium, wherein the dispersed disulfonamidophenol oxidized developer scavenger consists essentially of disulfonamidophenols in solid particle crystalline form.
Claim 3
Dependent Claim
160 words
A photographic element according to claim 1, wherein the disulfonamidophenol has the formula ##STR6## wherein: R and R 1 represents a substituted or unsubstituted alkyl or aryl group; G is hydroxy or an alkali labile precursor thereof; each of R 2 and R 3 is individually alkyl of 1 to 30 carbon atoms, aryl of 6 to 30 carbon atoms or heterocyclic of 5 to 30 carbon atoms containing one or more ring hetero atoms; and each of R 4 , R 5 and R 6 is individually hydrogen, halogen, alkyl of 1 to 30 carbon atoms, alkoxy of 1 to 30 carbon atoms or aryloxy of 6 to 30 carbon atoms; each of Ar 1 and Ar 2 independently is an aryl group; and each of R 7 , R 8 , and R 9 independently is a hydrogen or halogen atom, or an unsubstituted or substituted alkyl, cycloalkyl aralkyl, aryl, alkenyl, alkynyl, heterocyclic, alkoxy, alkylthio, or acylamino group.
Claim 4
Dependent Claim
13 words
A photographic element of claim 2, wherein the disulfonamidophenol has the formula: ##STR7##
Claim 5
Dependent Claim
74 words
A photographic element according to claim 1, wherein the dispersed disulfonamidophenol oxidized developer scavenger is formed by a process comprising the steps of: (a) milling crystalline solid particles of the scavenger in an aqueous medium in the presence of a dispersing agent and in the substantial absence of an organic solvent to form a first dispersion; and (b) adding the first dispersion to an aqueous medium comprising a binder to form a second dispersion.
Claim 6
Dependent Claim
27 words
A photographic element according to claim 4, wherein the dispersing agent is an anionic, nonionic or zwitterionic surfactant, a water soluble homopolymer or copolymer, or mixtures thereof.
Claim 7
Dependent Claim
78 words
A photographic element according to claim 1, prepared by a process which comprises the steps of: (a) milling crystalline solid particles of a disulfonamidophenol oxidized developer scavenger in an aqueous medium in the presence of a dispersing agent and in the substantial absence of an organic solvent to form a first dispersion; (b) adding the first dispersion to an aqueous medium comprising a binder to form a second dispersion; and (c) coating the second dispersion onto a support.
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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) | 1998-10-02 | 1999-04-03 | 1999-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-02 | 2003-04-03 | 2003-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-02 | 2007-04-03 | 2007-10-03 | $7700.00 | Window Closed / Lapsed |