Silver halide emulsions with improved heat stability
AssigneeEastman Kodak Company
InventorRoger Lok
Life of this patent
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Abstract
A silver halide photographic element comprising a silver halide emulsion which is greater than 50 mole % silver chloride, said emulsion being in reactive association with a dioxide compound represented by the following formula: ##STR1## wherein b is C(O), C(S), C(Se), CH.sub.2 or (CH.sub.2).sub.2 ; and R.sup.1 and R.sup.2 are independently H, or aliphatic, aromatic or heterocyclic groups, or R.sup.1 and R.sup.2 together represent the atoms necessary to form a five or six-membered ring or a multiple ring system; and a sulfinate compound.
Claims20
A silver halide photographic element comprising a silver halide emulsion which is greater than 50 mole % silver chloride, said emulsion being in reactive association with a dioxide compound represented by the following formula:
- ##STR5## wherein b is C(O), C(S), C(Se), CH.sub.2 or (CH.sub.2).sub.2 ;
- and R.sup.1 and R.sup.2 are independently H, or aliphatic, aromatic or heterocyclic groups, or R.sup.1 and R.sup.2 together represent the atoms necessary to form a five or six-membered ring or a multiple ring system;
- and a sulfinate compound.
A silver halide photographic element comprising a silver halide emulsion which is greater than 90 mole % silver chloride, said emulsion being in reactive association with a dioxide compound represented by the following formula:
- ##STR6## wherein b is C(O), C(S), or C(Se), and R.sup.1 and R.sup.2 together represent the atoms necessary to form a five or six-membered ring or a multiple ring system;
- and a sulfinate compound of the formula RSO.sub.2 M wherein R is an alkyl, aryl, or aralkyl group;
- and M is a monovalent metal or a tetraalkylammonium cation.
A method of making a silver halide emulsion, the emulsion being greater than 50 mole % silver chloride, comprising precipitating and chemically sensitizing the emulsion;
- and further comprising adding to the emulsion a dioxide compound represented by the following formula:
- ##STR7## wherein b is C(O), C(S), C(Se), CH.sub.2 or (CH.sub.2).sub.2, and R.sup.1 and R.sup.2 are independently H, or aliphatic, aromatic or heterocyclic groups, or R.sup.1 and R.sup.2 together represent the atoms necessary to form a five or six-membered ring or a multiple ring system;
- and a sulfinate compound.
Dependencies are inferred from the claim text.