Mesoionic silver halide stabilizer precursor and use in a heat developable and heat stabilizable photographic silver halide material and process

Claim 2

In a heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in binder: (a) photographic silver halide, (b) a photographic silver halide developing agent, (c) an activating concentration of a thermal base releasing compound, the improvement comprising (d) a stabilizing concentration of a mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor containing a heat releasable blocking group on the sulfur atom.

Claim 3

A heat developable and heat stabilizable photographic silver halide element as in claim 1 wherein said mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consists essentially of a compound represented by the formula: ##STR35## wherein: R 1 is alkyl containing 1 to 18 carbon atoms, amino, alkenyl containing 3 to 18 carbon atoms, cycloalkyl containing 3 to 12 carbon atoms, or aryl containing 6 to 20 carbon atoms; R 2 is alkyl containing 1 to 9 carbon atoms or aryl containing 6 to 12 carbon atoms; R 3 is alkyl containing 1 to 18 carbon atoms, aryl containing 6 to 20 carbon atoms, or cycloalkyl containing 3 to 12 carbon atoms; and

Claim 4

--CH 2 ) n R 4 is a heat releasable blocking group on the sulfur atom; and R 4 is alkyl containing 1 to 18 carbon atoms, aryl containing 6 to 20 carbon atoms, carboxyaryl containing 7 to 13 carbon atoms, cyano (CN), or amido (CONH 2 ); n is 1 or 2; and X is an acid anion.

Claim 5

--CH 2 ) n R 4 is a heat releasable blocking group on the sulfur atom; and R 4 is alkyl containing 1 to 18 carbon atoms, aryl containing 6 to 20 carbon atoms, carboxyaryl containing 7 to 13 carbon atoms, cyano (CN), or amido (CONH 2 ); n is 1 or 2; and X is an acid anion.

Claim 6

A heat developable and heat stabilizable photographic silver halide element as in claim 1 wherein said mesionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consists essentially of 1,4,5-trimethyl-3-(2-carboxybenzylthio)-1,2,4-triazolium nitrate represented by the formula: ##STR36##

Claim 7

A heat developable and heat stabilizable photographic silver halide element as in claim 1 wherein said mesionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consists essentially of 1,4,5-trimethyl-3-(cyanomethylthio)-1,2,4-triazolium tetrafluoroborate represented by the formula: ##STR37##

Claim 8

A heat developable and heat stabilizable photographic silver halide element as in claim 1 wherein said binder consists essentially of gelatin.

Claim 9

A heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in a gelatino binder: (a) photographic silver halide; (b) an ascorbic acid photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound; (d) an antifoggant concentration of a tetraazaindene antifoggant; and, (e) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consisting essentially of 1,4,5-trimethyl-3-(2-carboxybenzylthio)-1,2,4-triazolium nitrate.

Claim 10

A heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in a gelatino binder: (a) photographic silver halide; (b) an ascorbic acid photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound; (d) an antifoggant concentration of a tetraazaindene antifoggant; and, (e) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consisting essentially of 1,4,5-trimethyl-3-(2-carboxybenzylthio)-1,2,4-triazolium nitrate.

Claim 11

A heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in a gelatino binder: (a) photographic silver halide; (b) an ascorbic acid photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound; (d) an antifoggant concentration of a tetraazaindene antifoggant; and, (e) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consisting essentially of 1,4,5-trimethyl-3-(cyanomethylthio)-1,2,4-triazolium tetrafluoroborate.

Claim 12

A heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in a gelatino binder: (a) photographic silver halide; (b) an ascorbic acid photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound; (d) an antifoggant concentration of a tetraazaindene antifoggant; and, (e) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consisting essentially of 1,4,5-trimethyl-3-(cyanomethylthio)-1,2,4-triazolium tetrafluoroborate.

Claim 13

In a heat developable and heat stabilizable photographic silver halide composition comprising: (a) photographic silver halide, (b) a photographic silver halide developing agent, (c) an activating concentration of a thermal base releasing compound, the improvement comprising (d) a stabilizing concentration of a mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor containing a heat releasable blocking group on the sulfur atom.

Claim 14

In a heat developable and heat stabilizable photographic silver halide composition comprising: (a) photographic silver halide, (b) a photographic silver halide developing agent, (c) an activating concentration of a thermal base releasing compound, the improvement comprising (d) a stabilizing concentration of a mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor containing a heat releasable blocking group on the sulfur atom.

Claim 15

A heat developable and heat stabilizable photographic silver halide composition as in claim 8 wherein said mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consists essentially of a compound represented by the formula: ##STR38## wherein: R 1 is alkyl containing 1 to 18 carbon atoms, amino, alkenyl containing 3 to 18 carbon atoms, cycloalkyl containing 3 to 12 carbon atoms, or aryl containing 6 to 20 carbon atoms; R 2 is alkyl containing 1 to 9 carbon atoms or aryl containing 6 to 12 carbon atoms; R 3 is alkyl containing 1 to 18 carbon atoms, aryl containing 6 to 20 carbon atoms, or cycloalkyl containing 3 to 12 carbon atoms; and --CH 2 I n R 4 is a heat releasable blocking group on the sulfur atom; and R 4 is alkyl containing 1 to 18 carbon atoms, aryl containing 6 to 20 carbon atoms, carboxyaryl containing 7 to 13 carbon atoms, cyano (CN), or amido (CONH 2 ); n is 1 or 2; and X is an acid anion.

Claim 16

A heat developable and heat stabilizable photographic silver halide composition as in claim 8 wherein said mesionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consists essentially of 1,4,5-trimethyl-3-(2-carboxybenzylthio)-1,2,4-triazolium nitrate represented by the formula: ##STR39##

Claim 17

A heat developable and heat stabilizable photographic silver halide composition as in claim 8 wherein said mesionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consists essentially of 1,4,5-trimethyl-3-(cyanomethylthio)-1,2,4-triazolium tetrafluoroborate represented by the formula: ##STR40##

Claim 18

A heat developable and heat stabilizable photographic silver halide composition as in claim 8 also comprising a binder.

Claim 19

A heat developable and heat stabilizable photographic silver halide composition as in claim 8 also comprising a gelatino binder.

Claim 20

A heat developable and heat stabilizable photographic silver halide composition comprising, in a gelatino binder: (a) photographic silver halide; (b) an ascorbic acid photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound; (d) an antifoggant concentration of a tetraazaindene antifoggant; and, (e) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consisting essentially of 1,4,5-trimethyl-3-(2-carboxybenzylthio)-1,2,4-triazolium nitrate.

Claim 21

A heat developable and heat stabilizable photographic silver halide composition comprising, in a gelatino binder: (a) photographic silver halide; (b) an ascorbic acid photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound; (d) an antifoggant concentration of a tetraazaindene antifoggant; and, (e) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consisting essentially of 1,4,5-trimethyl-3-(2-carboxybenzylthio)-1,2,4-triazolium nitrate.

Claim 22

A heat developable and heat stabilizable photographic silver halide composition comprising, in a gelatino binder: (a) photographic silver halide; (b) an ascorbic acid photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound; (d) an antifoggant concentration of a tetraazaindene antifoggant; and, (e) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consisting essentially of 1,4,5-trimethyl-3-(cyanomethylthio)-1,2,4-triazolium tetrafluoroborate.

Claim 23

A heat developable and heat stabilizable photographic silver halide composition comprising, in a gelatino binder: (a) photographic silver halide; (b) an ascorbic acid photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound; (d) an antifoggant concentration of a tetraazaindene antifoggant; and, (e) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate silver halide stabilizer precursor consisting essentially of 1,4,5-trimethyl-3-(cyanomethylthio)-1,2,4-triazolium tetrafluoroborate.

Claim 24

A process of developing and stabilizing an image in an exposed photographic element as defined in claim 1 comprising heating said element to a temperature within the range of about 100° C. to about 180° C. until said image is developed and stabilized.

Claim 25

A process of developing and stabilizing an image in an exposed photographic silver halide element comprising a support having thereon, in a gelatino binder: (a) photographic silver halide; (b) an ascorbic acid photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound; (d) an antifoggant concentration of a tetraazaindene antifoggant; and, (e) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate stabilizer precursor consisting essentially of 1,4,5-trimethyl-3-(2-carboxybenzylthio)-1,2,4-triazolium nitrate; 1,4,5-trimethyl-3-(cyanomethylthio)-1,2,4-triazolium tetrafluoroborate or combinations thereof; said process comprising heating said element to a temperature within the range of about 120° C. to about 180° C. until said image is developed and stabilized.

Claim 26

A process of developing and stabilizing an image in an exposed photographic silver halide element comprising a support having thereon, in a gelatino binder: (a) photographic silver halide; (b) an ascorbic acid photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound; (d) an antifoggant concentration of a tetraazaindene antifoggant; and, (e) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate stabilizer precursor consisting essentially of 1,4,5-trimethyl-3-(2-carboxybenzylthio)-1,2,4-triazolium nitrate; 1,4,5-trimethyl-3-(cyanomethylthio)-1,2,4-triazolium tetrafluoroborate or combinations thereof; said process comprising heating said element to a temperature within the range of about 120° C. to about 180° C. until said image is developed and stabilized.

Claim 27

A process of developing and stabilizing an image in an exposed photographic element as defined in claim 6 comprising heating said element to a temperature within the range of about 100° C. to about 180° C. until said image is developed and stabilized.

Claim 28

A heat activatable photographic silver halide processing composition comprising a photographic silver halide developing agent, a thermal base releasing compound and a stabilizing concentration of a mesionic 1,2,4-triazolium-3-thiolate stabilizer precursor containing a heat releasable blocking group on the sulfur atom.

Claim 29

A heat activatable photographic silver halide processing composition comprising a photographic silver halide developing agent, a thermal base releasing compound and a stabilizing concentration of a mesionic 1,2,4-triazolium-3-thiolate stabilizer precursor containing a heat releasable blocking group on the sulfur atom.

Claim 30

A heat activatable photographic silver halide processing composition comprising a photographic silver halide developing agent, a thermal base releasing compound and a silver halide stabilizing concentration of silver halide stabilizer precursor selected from the group consisting of 1,4,5-trimethyl-3-(2-carboxybenzylthio)-1,2,4-triazolium nitrate, 1,4,5-trimethyl-3-(cyanomethylthio)-1,2,4-triazolium tetrafluoroborate and combinations thereof.

Claim 31

A heat activatable photographic silver halide processing composition comprising a photographic silver halide developing agent, a thermal base releasing compound and a silver halide stabilizing concentration of silver halide stabilizer precursor selected from the group consisting of 1,4,5-trimethyl-3-(2-carboxybenzylthio)-1,2,4-triazolium nitrate, 1,4,5-trimethyl-3-(cyanomethylthio)-1,2,4-triazolium tetrafluoroborate and combinations thereof.