Ion-paired cobaltic complexes and photographic elements containing same

Claim 2

A photographic element comprising a support having thereon at least one layer containing a silver halide emulsion and at least one layer containing a water-insoluble ion pair of a cobalt(III) ion complex ion-paired with an anionic organic acid which has an equivalent weight of at least 70 based on acid groups.

Claim 3

A photographic element according to claim 1 wherein said photographic element contains from 1 mg./ft.2 to about 600 mg./ft.2 of said ion pair based on cobalt.

Claim 4

A photographic element according to claim 1 wherein said anionic organic acid is a compound which contains sulfonic acid groups and has an equivalent weight from about 100 to about 800 based on acid groups.

Claim 5

A photographic element according to claim 1 wherein said anionic organic acid is a compound which contains carboxylic acid groups and has an equivalent weight from about 70 to about 800 based on acid groups.

Claim 6

A photographic element according to claim 1 wherein said anionic organic acid is a polymeric compound.

Claim 7

A photographic element according to claim 1 wherein said cobalt(III) ion complex has a net positive charge.

Claim 8

A photographic element according to claim 1 wherein said cobalt(III) ion complex has a net positive charge of +3.

Claim 9

A photographic element according to claim 1 which comprises at least one layer containing a binder vehicle which can be hardened by photographic hardening agents.

Claim 10

A photographic element according to claim 1 wherein said layer containing said silver halide emulsion is located within an image dye-providing layer unit which comprises a color coupler.

Claim 11

A photographic element comprising a support having thereon at least one layer containing a water-insoluble ion pair of a cobalt(III) ion complex ion-paired with an anionic organic acid having an equivalent weight of at least 70 based on acid groups and at least one image dye-providing layer unit containing a silver halide emulsion.

Claim 12

A photographic element comprising a support having thereon at least one layer containing a water-insoluble ion pair of a cobalt(III) ion complex ion-paired with an anionic organic acid having an equivalent weight of at least 70 based on acid groups and at least one image dye-providing layer unit containing a silver halide emulsion.

Claim 13

A photographic element according to claim 10 which comprises three image dye-providing layer units containing a silver halide emulsion having associated therewith a color coupler.

Claim 14

A photographic element according to claim 10 which contains said ion pair in a concentration of from 2 mg./ft.2 to about 50 mg./ft.2 based on cobalt for each image dye-providing layer unit.

Claim 15

A photographic element according to claim 10 which contains said ion pair in a concentration of from about 5 mg./ft.2 to about 150 mg./ft.2 based on cobalt.

Claim 16

A photographic element according to claim 10 wherein said image dye-providing layer unit contains less than 30 mg./ft.2 based on silver of said silver halide emulsion.

Claim 17

A photographic element according to claim 10 wherein said image dye-providing layer unit contains at least a 40 percent stoichiometric excess of a color coupler based on silver.

Claim 18

A photographic element according to claim 10 wherein said anionic organic compound is a polymeric compound containing sulfonic acid groups thereon and having an equivalent weight of at least 100 based on said groups.

Claim 19

A photographic element according to claim 10 wherein said anionic organic acid contains at least 2 carbon atoms.

Claim 20

A photographic element according to claim 10 wherein said anionic organic compound is a naphthalene sulfonic acid.

Claim 21

A photographic element according to claim 10 wherein said anionic organic compoUnd is a polymeric compound containing sulfonic acid groups thereon and photographic hardening groups thereon.

Claim 22

A photographic element comprising a support having thereon (1) an image dye-providing layer unit containing a blue-sensitive silver halide emulsion having associated therewith a yellow dye-providing coupler, (2) an image dye-providing layer unit comprising a green-sensitive silver halide emulsion having associated therewith a magenta dye-providing coupler, (3) an image dye-providing layer unit comprising a red-sensitive silver halide emulsion having associated therewith a cyan dye-providing coupler and (4) at least one layer in said element containing at least 3 mg. based on cobalt of a water-insoluble ion pair of a cobalt(III) ion complex ion-paired with an anionic organic acid having an equivalent weight of at least 70 based on acid groups.

Claim 23

A photographic element comprising a support having thereon (1) an image dye-providing layer unit containing a blue-sensitive silver halide emulsion having associated therewith a yellow dye-providing coupler, (2) an image dye-providing layer unit comprising a green-sensitive silver halide emulsion having associated therewith a magenta dye-providing coupler, (3) an image dye-providing layer unit comprising a red-sensitive silver halide emulsion having associated therewith a cyan dye-providing coupler and (4) at least one layer in said element containing at least 3 mg. based on cobalt of a water-insoluble ion pair of a cobalt(III) ion complex ion-paired with an anionic organic acid having an equivalent weight of at least 70 based on acid groups.

Claim 24

A photographic element according to claim 20 wherein said ion pair is present in said element in a concentration of from about 5 mg. to about 15 mg./ft.2 based on cobalt.

Claim 25

A photographic element according to claim 20 wherein at least two of said image dye-providing layer units contain less than 30 mg./ft.2 of effective silver halide based on silver.

Claim 26

A photographic element according to claim 20 wherein at least two of said image dye-providing layer units contain at least a 40 percent stoichiometric excess of coupler based on silver.

Claim 27

A photographic element according to claim 20 wherein said ion pair is present in at least on image dye-providing layer unit.

Claim 28

A photographic element according to claim 20 wherein said layer containing said ion pair is located adjacent said image dye-providing layer units but in water-permeable association with said image dye-providing layer units.

Claim 29

A photographic element according to claim 20 wherein said anionic organic acid is a polymeric compound having an equivalent weight of between 70 and 800 based on acid groups.

Claim 30

A photographic element according to claim 20 wherein said anionic organic acid is a naphthalene sulfonate.

Claim 31

A photographic element according to claim 20 wherein said anionic organic acid is a polymer containing units of 3-methacryloyloxypropane-1-sulfonic acid.

Claim 32

A SILVER HALIDE EMULSION COMPRISING A WATER-SOLUBLE ION PAIR OF A COBALT (II) ION COMPLEX ION-PAIRED WITH AN ANIONIC ORGANIC ACID WHICH HAS AN EQUIVALENT WEIGHT BASED ON ACID GROUPS OF AT LEAST 70 AND LESS THAN 800.

Claim 33

A SILVER HALIDE EMULSION COMPRISING A WATER-SOLUBLE ION PAIR OF A COBALT (II) ION COMPLEX ION-PAIRED WITH AN ANIONIC ORGANIC ACID WHICH HAS AN EQUIVALENT WEIGHT BASED ON ACID GROUPS OF AT LEAST 70 AND LESS THAN 800.

Claim 34

A silver halide emulsion according to claim 29 which contains said ion pair to provide a concentration of at least 0.25 mole of cobalt for each mole of silver.

Claim 35

A silver halide emulsion according to claim 29 wherein said anionic organic acid is a polymeric compound.

Claim 36

A silver halide emulsion according to claim 29 wherein said cobalt(III) ion complex is a cobaltic hexammine.

Claim 37

A silver halide emulsion according to claim 32 which contains an image dye-providing color coupler.

Claim 38

A silver halide emulsion according to claim 29 wherein said cobalt(III) ion complex will undergo a redox reaction at a metallic silver surface in the presence of a silver halide developing agent.

Claim 39

A silver halide emulsion according to claim 34 wherein said cobalt(III) ion complex has a net positive charge.