Photographic elements containing N-oxide oxidants

Claim 2

A photographic element comprising a support having thereon at least one photographic dye-image receiving layer and at least one layer containing at least 40 mg per ft 2 of an aromatic heterocyclic N-oxide oxidant having a polarographic reduction potential more positive than about -0.5 v when in an aqueous solution comprising 4% potassium hydroxide.

Claim 3

In a photographic element containing an image dye-providing material which is oxidized under alkaline conditions to form an image dye and at least one photographic dye-image receiving layer, the improvement wherein said element also comprises at least 40 mg per ft 2 of an aromatic heterocyclic N-oxide oxidant having a polarographic reduction potential of between about -0.1 and -0.5 v when in an aqueous solution comprising 4% potassium hydroxide.

Claim 4

In a photographic element containing an image dye-providing material which is oxidized under alkaline conditions to form an image dye and at least one photographic dye-image receiving layer, the improvement wherein said element also comprises at least 40 mg per ft 2 of an aromatic heterocyclic N-oxide oxidant having a polarographic reduction potential of between about -0.1 and -0.5 v when in an aqueous solution comprising 4% potassium hydroxide.

Claim 5

A photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer and at least one layer containing at least 40 mg per ft 2 of a compound of the formula: ##EQU8## wherein Z represents the nonmetallic atoms necessary to complete a 5- or 6-membered heterocyclic nucleus having up to three hetero atoms.

Claim 6

A photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer and at least one layer containing at least 40 mg per ft 2 of a compound of the formula: ##EQU8## wherein Z represents the nonmetallic atoms necessary to complete a 5- or 6-membered heterocyclic nucleus having up to three hetero atoms.

Claim 7

A photographic element as described in claim 3 wherein Z represents the atoms necessary to complete a pyridine nucleus.

Claim 8

A photographic element as described in claim 3 wherein Z represents the atoms necessary to complete an oxadiazole nucleus.

Claim 9

A photographic film unit comprising a. a photosensitive element comprising a support having thereon a photosensitive silver halide emulsion having associated therewith an image dye-providing compound; b. a dye image-receiving layer; and c. means for discharging an alkaline processing composition contained within said film unit; said film unit containing an aromatic heterocyclic N-oxide oxidant for said dye-providing compound, and said N-oxide having a polarographic reduction potential more positive than about -0.5 v when in an aqueous solution comprising 4% potassium hydroxide.

Claim 10

A photographic film unit comprising a. a photosensitive element comprising a support having thereon a photosensitive silver halide emulsion having associated therewith an image dye-providing compound; b. a dye image-receiving layer; and c. means for discharging an alkaline processing composition contained within said film unit; said film unit containing an aromatic heterocyclic N-oxide oxidant for said dye-providing compound, and said N-oxide having a polarographic reduction potential more positive than about -0.5 v when in an aqueous solution comprising 4% potassium hydroxide.

Claim 11

The film unit as described in claim 6 wherein said N-oxide is contained in said alkaline processing composition.

Claim 12

The film unit as described in claim 6 wherein said N-oxide is associated with said image receiving layer.

Claim 13

The film unit as described in claim 6 wherein said N-oxide is a benzofuroxan.

Claim 14

The film unit as described in claim 6 wherein said N-oxide is a 4,4'-azopyridine-1,1'-dioxide.

Claim 15

A photographic film unit comprising: a. a photosensitive element comprising a support having thereon a layer containing a red-sensitive silver halide emulsion having associated therewith a cyan image dye-providing material, a layer containing a green-sensitive silver halide emulsion having associated therewith a magenta image dye-providing material, and a layer containing a blue-sensitive silver halide emulsion having associated therewith a yellow image dye-providing material, b. an image dye-receiving layer; and c. means for discharging an alkaline processing composition within said film unit; said film unit containing an aromatic heterocyclic N-oxide selected from the group consisting of a benzofuroxan and a 4,4'-azopyridine-1,1'-dioxide.

Claim 16

A photographic film unit comprising: a. a photosensitive element comprising a support having thereon a layer containing a red-sensitive silver halide emulsion having associated therewith a cyan image dye-providing material, a layer containing a green-sensitive silver halide emulsion having associated therewith a magenta image dye-providing material, and a layer containing a blue-sensitive silver halide emulsion having associated therewith a yellow image dye-providing material, b. an image dye-receiving layer; and c. means for discharging an alkaline processing composition within said film unit; said film unit containing an aromatic heterocyclic N-oxide selected from the group consisting of a benzofuroxan and a 4,4'-azopyridine-1,1'-dioxide.

Claim 17

A film unit as described in claim 11 wherein at least one of said image dye-providing materials is an oxichromic compound.

Claim 18

A film unit as described in claim 11 wherein at least one of said image dye-providing materials is an oxichromic compound having the formula: ##EQU9## wherein: (COUP) is a photographic color coupler linked to the nitrogen atom through a carbon atom at the coupling position; Ar is an arylene group; X is selected from an amino group, a hydroxyl group or a group having the formula: ##EQU10## wherein R 2 is an alkyl or aryl group; R 1 is a hydrogen atom or a group having the formula: ##EQU11## wherein R 2 is as defined above; and Q is a silver halide developing agent or an oxidizable releasing group.

Claim 19

In a photographic process wherein an exposed photographic silver halide emulsion is developed and wherein an image dye-providing material is oxidized to provide an image dye record, the improvement comprising oxidizing said material with an aromatic heterocyclic N-oxide having a polarographic reduction potential more positive than about -0.5 v when in an aqueous solution comprising 4% potassium hydroxide.

Claim 20

In a photographic process wherein an exposed photographic silver halide emulsion is developed and wherein an image dye-providing material is oxidized to provide an image dye record, the improvement comprising oxidizing said material with an aromatic heterocyclic N-oxide having a polarographic reduction potential more positive than about -0.5 v when in an aqueous solution comprising 4% potassium hydroxide.

Claim 21

A photographic element comprising a support having thereon at least one photographic silver halide emulsion layer and at least 40 mg per ft 2 of an aromatic heterocyclic N-oxide oxidant having a polarographic reduction potential more positive than about -0.5 v when in an aqueous solution comprising 4% potassium hydroxide.

Claim 22

A photographic element comprising a support having thereon at least one photographic silver halide emulsion layer and at least 40 mg per ft 2 of an aromatic heterocyclic N-oxide oxidant having a polarographic reduction potential more positive than about -0.5 v when in an aqueous solution comprising 4% potassium hydroxide.

Claim 23

A photographic element comprising a support having thereon at least one photographic dye-image receiving layer and at least one layer containing at least 40 mg per ft 2 of a compound having a formula selected from ##SPC3## and ##SPC4## wherein: R 1 and R 2 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms, a halogen atom, a nitro group, an oxo-linked benzofuran or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group, n is an integer having a value of 0 or 1, and R 3 and R 4 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group.

Claim 24

A photographic element comprising a support having thereon at least one photographic dye-image receiving layer and at least one layer containing at least 40 mg per ft 2 of a compound having a formula selected from ##SPC3## and ##SPC4## wherein: R 1 and R 2 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms, a halogen atom, a nitro group, an oxo-linked benzofuran or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group, n is an integer having a value of 0 or 1, and R 3 and R 4 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group.

Claim 25

In a photographic element containing an image dye-providing material which is oxidized under alkaline conditions to form an image dye and at least one photographic dye-image receiving layer, the improvement wherein said element also comprises at least 40 mg per ft 2 of a compound having a formula selected from ##SPC5## and ##SPC6## wherein: R 1 and R 2 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms, a halogen atom, a nitro group, an oxo-linked benzofuran or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group, n is an integer having a value of 0 or 1, and R 3 and R 4 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group.

Claim 26

In a photographic element containing an image dye-providing material which is oxidized under alkaline conditions to form an image dye and at least one photographic dye-image receiving layer, the improvement wherein said element also comprises at least 40 mg per ft 2 of a compound having a formula selected from ##SPC5## and ##SPC6## wherein: R 1 and R 2 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms, a halogen atom, a nitro group, an oxo-linked benzofuran or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group, n is an integer having a value of 0 or 1, and R 3 and R 4 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group.

Claim 27

A photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer and at least one layer containing at least 40 mg per ft 2 of a compound having a formula selected from ##SPC7## wherein: R 1 and R 2 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms, a halogen atom, a nitro group, an oxo-linked benzofuran or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group, n is an integer having a value of 0 or 1, and R 3 and R 4 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group.

Claim 28

A photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer and at least one layer containing at least 40 mg per ft 2 of a compound having a formula selected from ##SPC7## wherein: R 1 and R 2 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms, a halogen atom, a nitro group, an oxo-linked benzofuran or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group, n is an integer having a value of 0 or 1, and R 3 and R 4 each represents a hydrogen atom, an alkyl group having from 1 to 7 carbon atoms, an alkoxy group having from 1 to about 25 carbon atoms or an organic ballasting group having from about 8 to about 25 carbon atoms and comprising an alkyl group, an aryl group, an aralkyl group or an alkaryl group.