EP0028099A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Photographic couplers, emulsions, materials and processes
Assignee: Eastman Kodak Co
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Filing: 1980-10-15
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Granted: —
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Expires: 2000-10-15
Abstract
Abstract Phenolic cyan dye-forming couplers of the general formula: wherein X is hydrogen or a coupling-off group and R is a ballast group, are useful in photographic emulsions, matenals and processes. The cyan dyes prepared when such couplers are reacted with oxidized aromatic primary amino colour developing agents such as p-phenylenediamines have little or no absorption in the green region of the spectrum and have relatively pure hues.
Inventors
- 👤 Philip Thiam Shin Lau
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 15:27
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/34; G03C7/346; C; C07; C07C; C07C275/00; C07C275/28; C07C275/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
24 words
A photographic cyan dye-forming coupler having the structural formula: wherein: X is a hydrogen or a coupling-off group; and R is a ballast group.
Claim 2
Dependent Claim
24 words
A photographic cyan dye-forming coupler having the structural formula: wherein: X is a hydrogen or a coupling-off group; and R is a ballast group.
Claim 3
Dependent Claim
102 words
A photographic cyan dye-forming coupler of Claim 1 wherein R has the structure: wherein: Y is oxygen or sulphur; R 1 is an alkylidene group of 2 to 20 carbon atoms having the formula R 3 - -Alkyl wherein R 3 is hydrogen or alkyl; R 2 is hydroxy, carboxy, alkyl, aryl, aralkyl, alkoxyl, aryloxy, alkylsulphamoyl, arylsulphamoyl, alkylsulphonamido, arylsulphonamido, alkylsulphonyl, arylsulphonyl, alkoxycarbonyl, or acyloxy wherein alkyl contains 1 to 20 carbon atoms and aryl contains 6 to 20 carbon atoms and wherein alkyl, aryl and aralkyl can be optionally substituted with hydroxy, carboxy, alkoxycarbonyl or acyloxy; and x is 1 to 3.
Claim 4
Dependent Claim
14 words
A coupler according to Claim 1 wherein R of the formula I is: or:
Claim 5
Dependent Claim
19 words
A photographic silver halide emulsion containing a cyan dye-forming coupler as specified in any of Claims 1 to 3.
Claim 6
Dependent Claim
35 words
A photographic material comprising a support and a photographic silver halide emulsion layer and incorporated in that layer or a layer adjacent thereto a cyan dye-forming coupler specified in any of Claims 1 to 3.
Claim 7
Dependent Claim
43 words
A photographic process for forming a cyan dye image which comprises forming an imagewise distribution of developable silver halide in a photographic material according to Claim 5 and developing said distribution with a developing composition containing an aromatic primary amino colour developing agent.
References Cited (Backward Citations)
GB1011940A
Cited
US3446622A
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US3996253A
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US3758308A
Cited
DE2263171A1
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US3864366A
Cited
FR2382437A1
Cited
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