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Silver halide photosensitive materials containing thiourea and analogue derivatives
| Details |
Inventors: Herz, Arthur H.; Burgmaier, George J.;
Assignee: Eastman Kodak Company (Rochester, NY)
Primary Examiner: Martin; Roland E.
Assistant Examiner: Doody; Patrick A.
Attorney, Agent or Firm: Kirchoff; Thomas H.
A photographic silver halide emulsion comprising a 1,1,3,3-tetrasubstituted middle chalcogen urea compound is described wherein at least one substituent comprises an acid function. The urea compound is an effective silver halide grain growth-modifying agent. A process for modifying the grain growth of silver halide is also described. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A photographic silver halide emulsion comprising a 1,1,3,3-tetra-substituted urea compound having the structural formula: ##STR6## wherein X is a middle chalcogen atom; each of R.
sub.
1, R.
sub.
2, R.
sub.
3 and R.
sub.
4, independently, can represent an alkylene, cycloalkylene, alkarylene, aralkylene or heterocyclic arylene group, or taken together with the nitrogen atom to which they are attached, R.
sub.
1 and R.
sub.
2 or R.
sub.
3 and R.
sub.
4 complete a 5 to 7 member heterocyclic ring; and each of A.
sub.
1, A.
sub.
2, A.
sub.
3 and A.
sub.
4, independently, is hydrogen or represents a radical comprising an acidic group; with the proviso that at least one of A.
sub.
1 R.
sub.
1 to A.
sub.
4 R.
sub.
4 contains an acidic group bonded to a urea nitrogen atom through a chain comprising at least 4 atoms wherein the acidic group has a dissociation constant pKa smaller than about 7 said urea compound being present in an amount of from about 10.
sup.
-6 to about 10.
sup.
-1 mol thereof per mol of silver halide.
2.
The photographic emulsion of claim 1 wherein X is sulfur.
3.
The photographic emulsion of claim 1 wherein the acidic group comprises the OH portion of an oxygen acid which is carboxylic, sulfinic, sulfonic or hydroxamic group.
4.
The photographic emulsion of claim 3 wherein said acidic group is carboxylic acid or an inorganic or organic salt thereof.
5.
The photographic emulsion of claim 1 wherein the compound is present in an amount of from about 10.
sup.
-4 to about 10.
sup.
-2 mol thereof per mol of silver halide.
6.
The photographic emulsion of claim 1 wherein the compound is: ##STR7## 7.
The photographic emulsion of claim 1 wherein the compound is: ##STR8## 8.
The photographic emulsion of claim 1 wherein the compound is: ##STR9## 9.
The photographic emulsion of claim 1 wherin the compound is: ##STR10## 10.
In a process for the growth modification of silver halide grains, the improvement which comprises adding, during preparation of said grains or prior to coating thereof on a support, from about 10
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