Silver halide photographic emulsions sensitized in the presence of organic disulfides and sulfinates
AssigneeEastman Kodak Company
InventorsRoger L. Klaus, Patricia A. Leonard
Life of this patent
Estimating the term…
Abstract
This invention provides a method of preparing a silver halide photographic emulsion which comprises adding to the silver halide emulsion after precipitation and before or during sensitization a disulfide compound and a sulfinate compound, wherein the disulfide compound and the sulfinate compound are added simultaneously. It further provides a silver halide photographic emulsion prepared by the above method.
Claims24
A method of making a negative photographic silver halide emulsion comprising:
- precipitating and sensitizing a silver halide emulsion;
- and
- simultaneously adding to the silver halide emulsion after precipitation and before or during spectral/chemical sensitization an antifogging amount of a disulfide compound represented by Formula I or II and an antifogging amount of a sulfinate or seleninate compound represented by Formula III:
- ##STR7## where G independently is hydrogen, hydroxy, --SO.sub.3 M or --NR.sup.1 R.sup.2 ;
- M is hydrogen, or an alkaline earth, alkylammonium or arylammonium cation;
- R.sup.1 is hydrogen, or an alkyl or aryl group
- R.sup.2 is hydrogen, O.dbd.C--R.sup.3, or O.dbd.C--N--R.sup.4 R.sup.5 ;
- and
- R.sup.3, R.sup.4, and R.sup.5 are independently hydrogen, or hydroxy, or an unsubstituted alkyl, or aryl group, or a fluoroalkyl, fluoroaryl, alkylthioether, or arylthioether group, or a carboxyalkyl, carboxyaryl, alkylthioether, sulfoalkyl, or sulfoaryl group or the free acid, alkaline earth salt to alkylammonium or arylammonium salt thereof;
- ##STR8## where Z is a group containing 3 to 10 carbon or hetero atoms and R.sup.6 is an alkyl or aryl group of 2 to 10 carbon atoms, or the free acid, alkaline earth salt, arylammonium or alkylammonium salt of the aforementioned groups;
- and
- R.sup.7 --XO.sub.2 --M Formula III
- where R.sup.7 is a aliphatic, aromatic, or heterocyclic group;
- X is sulfur or selenium;
- and M is a cation.
A method of making a negative photographic silver halide emulsion comprising:
- precipitating and sensitizing a silver halide emulsion;
- and
- simultaneously adding to the emulsion after precipitation and before or during spectral/chemical sensitization 1.times.10.sup.-7 to 1.times.10.sup.-2 mol/mol Ag of a disulfide compound represented by Formula I and 2.times.10.sup.-9 to 0.5 mol/mol Ag of a sulfinate compound represented by Formula III;
- ##STR9## wherein G is in a para position relative to sulfur and is --NR.sup.1 R.sup.2, R.sup.1 is hydrogen or methyl, R.sup.2 is O.dbd.C--R.sup.3 and R.sup.3 is an alkyl group of 1 to 10 carbon atoms, an aryl group of 6 to 10 carbon atoms or a trifluoromethyl group;
- and
- R.sup.7 --XO.sub.2 --M Formula III
- wherein X is sulfur;
- R.sup.7 is an alkyl group having from 1 to 8 carbon atoms;
- an alkenyl or alkynyl group having from 3 to 5 carbon atoms;
- an aromatic group having from 6 to 10 carbon atoms;
- or a heterocyclic group having a 5 to 10 membered ring with at least one atom selected from nitrogen, oxygen, sulfur, selenium and tellurium;
- and M is an alkali metal ion.
A method of making a negative photographic silver halide emulsion comprising:
- precipitating and sensitizing a silver halide emulsion;
- and
- combining 1.times.10.sup.-5 to 3.times.10.sup.-4 mol/mol Ag p-acetamidophenyl disulfide and 2.times.10.sup.-5 to 2.times.10.sup.-2 mol/mol Ag sodium p-tolylsulfinate in an aqueous/methanol solution;
- and
- adding the aqueous/methanol solution of p-acetamidophenyl disulfide and sodium p-tolylsulfinate to the emulsion after precipitation and before or during spectral/chemical sensitization.
Dependencies are inferred from the claim text.