US4728599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sterically hindered phenolic ester photographic coupler dispersion addenda and photographic elements employing same
Assignee: Eastman Kodak Co
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Filing: 1985-12-02
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Granted: 1988-03-01
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Expires: 2005-12-02
Abstract
Abstract Photographic coupler dispersion addenda comprising phenolic esters of di-, tri- and tetra-carboxybenzene derivatives having bulky ortho substituents are described for incorporation in photographic emulsions and elements. The solvents are preferably employed in the cyan layer to protect the cyan dye against ferrous ion reduction. The solvents also provide improvements in yellow dye stability to light and cyan dye stability to light, heat and humidity.
Inventors
- 👤 Sundaram Krishnamurthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:52
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; Y; Y10; Y10S; Y10S430/00; Y10S430/132
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
191 words
A photographic element comprising a support having thereon at least one silver halide emulsion layer having associated therewith a dye-forming coupler dispersed in a coupler solvent therefor together with a dispersion addendum having the formula: ##STR26## wherein A is CH or N; each X 1 , X 2 and X 3 can independently be --H, halogen, --R, --CH═NOR, --COR, --SO 2 R, --YR, --YCOR, --COYR, --YSO 2 R or --SO 2 YR, wherein Y is O, S or NR' and R' is H or R; or two X groups can join together to form a heterocyclic ring; R can be a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group; n is 2, 3 or 4 and each m is 1, 2 or 3; with the proviso that at least one pair of X 1 and X 2 substituents attached to the same benzene ring must contain a total of two or more non-hydrogen atoms, and with the further proviso that only one of X 1 , X 2 and X 3 substituents attached to the same benzene ring may be hydrogen.
Claim 2
Dependent Claim
191 words
A photographic element comprising a support having thereon at least one silver halide emulsion layer having associated therewith a dye-forming coupler dispersed in a coupler solvent therefor together with a dispersion addendum having the formula: ##STR26## wherein A is CH or N; each X 1 , X 2 and X 3 can independently be --H, halogen, --R, --CH═NOR, --COR, --SO 2 R, --YR, --YCOR, --COYR, --YSO 2 R or --SO 2 YR, wherein Y is O, S or NR' and R' is H or R; or two X groups can join together to form a heterocyclic ring; R can be a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group; n is 2, 3 or 4 and each m is 1, 2 or 3; with the proviso that at least one pair of X 1 and X 2 substituents attached to the same benzene ring must contain a total of two or more non-hydrogen atoms, and with the further proviso that only one of X 1 , X 2 and X 3 substituents attached to the same benzene ring may be hydrogen.
Claim 3
Dependent Claim
20 words
The element of claim 1 wherein said dye-forming coupler forms a cyan dye upon reaction with oxidized color developing agent.
Claim 4
Dependent Claim
31 words
The element of claim 2 wherein said cyan dye-forming coupler is a phenol or a naphthol and said coupler and said dispersion addendum are located in said silver halide emulsion layer.
Claim 5
Dependent Claim
16 words
The element of claim 1 wherein n is 2, m is 1 and A is CH.
Claim 6
Dependent Claim
28 words
The element of claim 4 wherein each X 1 , X 2 and X 3 independently is an alkyl group of from 1 to about 6 carbon atoms.
Claim 7
Dependent Claim
43 words
The element of claim 4 wherein X 1 is a heterocyclic group, X 2 is H or an alkyl group of from 1 to about 6 carbon atoms and X 3 is an alkyl group of from 1 to about 6 carbon atoms.
Claim 8
Dependent Claim
25 words
The element of claim 4 wherein X 1 is --COR 1 wherein R 1 is phenyl, X 2 is hydrogen and X 3 is methoxy.
Claim 9
Dependent Claim
30 words
The element of claim 4 wherein X 2 is hydrogen and each X 1 and X 3 independently is an alkyl group of from 2 to about 6 carbon atoms.
Claim 10
Dependent Claim
36 words
The element of claim 1 wherein n is 4, m is 1, each X 1 and X 2 independently is an alkyl group of from 1 to about 6 carbon atoms and X 3 is hydrogen.
References Cited (Backward Citations)
US3080339A
Cited
US3779765A
Cited
JPS5425823A
Cited
US4193802A
Cited
US4268593A
Cited
US4308328A
Cited
US4327175A
Cited
US4407940A
Cited
US4451558A
Cited
EP0102839A1
Cited
US4609618A
Cited
JPS59149363A
Cited
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