Photographic developing composition and use thereof in the development of a photographic element
View Patent ↗A photographic developer composition for use in the development of a black and white silver halide photographic element said composition comprises at least one developing agent and, in an amount sufficient to inhibit sludge deposition, one or more compounds selected from compounds having the formula X—R 1 —CONH-A-S—S—B—NHCO—R 2 —Y (I) wherein A and B are each independently a substituted or unsubstituted aliphatic, alicyclic, aromatic or heterocyclic group; R 1 and R 2 are each independently a substituted or unsubstituted aliphatic, alicyclic, aromatic or heterocyclic group; X and Y are each independently a solubilizing group; and compounds having the formula X—R 1 —CONH-A-S-M (II) wherein A, R 1 and X are as defined above, and M is either a hydrogen atom or a cationic species if the sulfur atom is in its ionized form.
1. A black and white silver halide photographic element comprising a support having thereon at least one light-sensitive silver halide emulsion layer said element comprising, in an amount sufficient to inhibit sludge deposition dining development, one or more compounds selected from compounds having the formula
X—R 1 —CONH-A-S—S—B—NHCO—R 2 —Y (I)
wherein
A and B are each independently a substituted or unsubstituted aliphatic, alicyclic, aromatic or heterocyclic group;
R 1 and R 2 are each independently a substituted or unsubstituted aliphatic, alicyclic, aromatic or heterocyclic group;
X and Y are each independently a solubilising group;
and compounds having the formula
X—R 1 —CONH-A-S-M (II)
wherein A, R 1 and X are as defined above, and
M is either a hydrogen atom or a cationic species if the sulfur atom is in its ionised form.
2. A photographic element as claimed in claim 1 further comprising one or more compounds selected from a compound having the formula
Q-S—H (III)
wherein Q represents a substituted or unsubstituted heterocyclic group, the silver salt of said compound being water insoluble and a thiol promoting compound selected from sugar derivatives, mercaptocarboxylic acids and compounds selected from those having formula (III) above whose silver salts may be water insoluble or water soluble.
3. A photographic element according to claim 1 wherein A and B are selected from a substituted or unsubstituted alkylene group having from 1 to 12 carbon atoms, a cycloalkylene group having from 5 to 8 ring carbon atoms, an aromatic group having from 5 to 10 ring carbon atoms, a heterocyclic group having from 5 to 10 ring atoms, said ring atoms being selected from selected from C, N, S, and O.
4. A photographic element according to claim 1 wherein A and B are phenylene groups.
5. A photographic element according to claim 1 wherein R 1 and R 2 are selected from a substituted or unsubstituted alkylene group having from 1 to 12 carbon atoms, a cycloalkylene group having from 5 to 8 ring carbon atoms, an aromatic group having from 5 to 10 ring carbon atoms, a heterocyclic group having from 5 to 10 ring atoms, said ring atoms being selected from selected from C, N, S, and O.
6. A photographic element according to claim 1 wherein R 1 and R 2 represent —(CH 2 ) 3 —.
7. A photographic element according to claim 1 wherein the X and Y groups are selected from quaternary ammonium groups and carboxylic, sulfonic, sulfinic and phosphonic groups in acid or salt form.
8. A photographic element according to claim 1 or claim 2 wherein A and B each represent paraphenylene, R 1 and R 2 each represent —(CH 2 ) 3 — and, X and Y each represent —COOM wherein M is either a hydrogen atom or a cationic species if the carboxyl group is in its ionised form.
9. A photographic element according to claim 2 wherein Q represents a substituted or unsubstituted heterocyclic group having from 5 to 10 ring atoms selected from C, N, S, and O.
10. A photographic element according to claim 2 wherein Q represents a benzothiazole group.
11. A photographic element according to claim 2 wherein the thiol promoting compound is selected from ascorbates, isoascorbates, erythorbates, piperidine hexose reductone, mercaptosuccinic acid, cysteine and 5-mercaptobenzotriazole.
12. A black and white silver halide photographic element comprising a support having thereon at least one light-sensitive silver halide emulsion layer said element comprising, in an amount sufficient to inhibit sludge deposition during development, a compound having the formula
X—R 1 —CONH-A-S—S—B—NHCO—R 2 —Y (I)
wherein
wherein A and B each represent paraphenylene, R 1 and R 2 each represent —(CH 2 ) 3 — and, X and Y each represent —COOM wherein M is either a hydrogen atom or a cationic species if the carboxyl group is in its ionised form;
and/or a compound having the formula
X—R 1 —CONH-A-S-M (II)
wherein A, R 1 , X and M are as defined above;
and which element further comprises mercaptosuccinic acid.
13. A method of forming a photographic image in a black and white silver halide photographic element which comprises imagewise exposing the photographic element and developing the exposed element with a developer solution which is or is produced from a composition comprising at least one developing agent and, in an amount sufficient to inhibit sludge deposition, one or more compounds selected from compounds having the formula
X—R 1 —CONH-A-S—S—B—NHCO—R 2 —Y (I)
wherein
A and B are each independently a substituted or unsubstituted aliphatic, alicyclic, aromatic or heterocyclic group;
R 1 and R 2 are each independently a substituted or unsubstituted aliphatic, alicyclic, aromatic or heterocyclic group;
X and Y are each independently a solubilising group;
and compounds having the formula
X—R 1 —CONH-A-S-M (II)
wherein A, R 1 and X are as defined above, and
M is either a hydrogen atom or a cationic species if the sulfur atom is in its ionised form, wherein one or more of the compounds (I) and (II) defined above are added to the developer solution from the photographic element during development.