Patent EP0416684A2 successfully refreshed from Google Patents.
EP0416684A2
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Photographic yellow couplers, method for their preparation and intermediates therefor
Assignee: Kodak Ltd
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Filing: 1990-08-23
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Granted: —
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Expires: 2010-08-23
Abstract
Abstract A photographic yellow dye-forming coupler having the general formula: wherein R¹ is an alkyl group of 1-4 carbon atoms, ball is a ballast group of such size and configuration as to render the coupier non-diffusible in photographic layers, Y is CO, PO₃ or SO₂, X is an aryloxy coupling-off group, and n is 1 or, when Y is PO₃, n is 2.
Inventors
- 👤 Paul A. C/O Eastman Kodak Company Burns
- 👤 Llewellyn James C/O Kodak Limited Leyshon
- 👤 Paul Richard C/O Kodak Limited Buckland
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 14:03
CPC Classifications
C; C07; C07C; C07C311/00; C07C311/01; C07C311/02; G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; G03C7/30511; G03C7/30517; G03C7/30535
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
62 words
A photographic yellow dye-forming coupler having the general formula: wherein R¹ is an alkyl group of 1-4 carbon atoms, ball is a ballast group of such size and configuration as to render the coupler non-diffusible in photographic layers, Y is CO, PO₃ or SO₂, X is an aryloxy coupling-off group, and n is 1 or, when Y is PO₃, n is 2.
Claim 2
Dependent Claim
62 words
A photographic yellow dye-forming coupler having the general formula: wherein R¹ is an alkyl group of 1-4 carbon atoms, ball is a ballast group of such size and configuration as to render the coupler non-diffusible in photographic layers, Y is CO, PO₃ or SO₂, X is an aryloxy coupling-off group, and n is 1 or, when Y is PO₃, n is 2.
Claim 3
Dependent Claim
22 words
A coupler as claimed in claim 1 in which ball comprises alkyl and/or aryl moieties optionally linked by ether or ester groups.
Claim 4
Dependent Claim
27 words
A coupler as claimed in claim 1 or 2 in which ball comprises an aryl moiety substituted with one or more alkyl groups containing 4-10 carbon atoms.
Claim 5
Dependent Claim
15 words
A coupler as claimed in any of claims 1 - 3 in which ball is:
Claim 6
Dependent Claim
32 words
A coupler as claimed in any of claims 1 - 4 in which the coupling-off group X is a phenoxy group containing electron-withdrawing or ionisable substituents at the ortho- and/or para positions.
Claim 7
Dependent Claim
18 words
A coupler as claimed in any of claims 1 - 5 in which the coupling-off group X is:
Claim 8
Dependent Claim
30 words
A photographic photosensitive material comprising a support bearing a layer of a photosensitive silver halide emulsion and, associated therewith a coupler as claimed in any of claims 1 - 6.
Claim 9
Dependent Claim
19 words
A photographic material as claimed in claim 7 which contains, associated with said coupler, a blocked bis-phenol dye stabiliser.
Claim 10
Dependent Claim
68 words
A multicolour photographic element comprising a support bearing a yellow dye image-forming unit comprised of at least one blue-sensitive silver halide emulsion layer having associated therewith at least one yellow dye-forming coupler according to any of Claims 1-6 and magenta and cyan dye image-forming units comprising at least one green- or red-sensitive silver halide emulsion layer having associated therewith at least one magenta or cyan dye-forming coupler respectively.
Claim 11
Dependent Claim
68 words
A method of making couplers of formula (I) of claim 1 which includes the step of condensing a compound of the formula: with a phenol (R²-OH) and reducing the nitro group of the resulting compound to form a compound of the formula: wherein R² is an aryl group which may be substituted with one or more alkyl groups, and R¹ is an alkyl group of 1-4 carbon atoms.
Claim 12
Dependent Claim
28 words
Intermediate compounds of the formula: wherein R² is an aryl group substituted with one or more alkyl groups, and R¹ is an alkyl group of 1-4 carbon atoms.
Claim 13
Dependent Claim
28 words
Intermediate compounds of the formula: wherein R² is an aryl group substituted with one or more alkyl groups, and R¹ is an alkyl group of 1-4 carbon atoms.
References Cited (Backward Citations)
No citation records indexed.
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