Direct positive processing of silver halide with metal dopants in diffusion transfer films

Claim 2

IN AN IMAGE-TRANSFER FILM UNIT WHICH COMPRISES AN IMAGERECEIVING LAYER, AT LAST ONE LAYER OF A PHOTO-SENSITIVE COMPOSITION HAVING ASSOCIATED THEREWITH AN IMAGE DYE-PROVIDING MATERIAL, A DEVELOPING AGENT, AND A PROCESSING COMPOSITION WHICH CAN BE DISCHARGED TO FACILITATE DEVELOPMENT OF SAID PHOTOSENSITIVE COMPOSITION BY PASSING SAID UNIT ETWEEN A PAIR OF JUXTAPOSED PRESSURE-APPLYING MEMBERS, THE IMPROVEMENT COMPRISING (1) SAID PHOTOSENSITIVE COMPOSITION IN SAID FILM UNIT COMPRISING UNFOGGED SILVER HALIDE GRAINS HAVING METAL DOPANTS OCCLUDED THEREIN, WHICH GRAINS HAVE BEEN CHEMICALLY SENSITIZED ON THE SURFACE THEREOF (A) TO A LEVEL WHICH WILL PROVIDED A DENSITY OF LESS THAN 0.4 WHEN DEVELOPED IN KADAK DEVELOPER DK-50 FOR 5 MINUTES AT 27*C AFTER IMAGEWISE EXPOSURE WHEN SAID PHOTOSENSITIVE COMPOITION IS COATED AT A COVERAGE OF BETWEEN ABOUT 300 TO ABOUT 400 MG OF SILVER PER SQUARE FOOT AND (B) TO AT LEAST A LEVEL WHICH WOULD ROVIDE A DENSITY OF 0.5 USING UNDOPED SILVER HALIDE GRAINS OF THE SAME GRAIN SIZE AND HALIDE COMPOSITION WHEN COATED, EXPOSED AND DEVELOPED IN LIKE MANNER, AND (2) A FOGGING AGENT LOCATED IN SAID FILM UNIT WHEREBY IT WILL BE IN CONTACT WITH SAID PHOTOSSENSITIVE COMPOSITION UPON DISCHARGE OF SAID PROCESSING COMPOSITION.

Claim 3

A film unit according to claim 1 wherein said film unit includes a rupturable pod within which said fogging agent is located.

Claim 4

an image-receiving layer,

Claim 5

an image-receiving layer,

Claim 6

means containing an alkaline processing composition for developing said silver halide emulsion layers adapted to discharge its contents within said film unit, and

Claim 7

means containing an alkaline processing composition for developing said silver halide emulsion layers adapted to discharge its contents within said film unit, and

Claim 8

A film unit according to claim 1 wherein said fogging agent is located in at least one layer of said film unit in association with said layer containing said silver halide grains.

Claim 9

A film unit according to claim 1 wherein said film unit comprises at least three of said silver halide layers wherein the silver halide in one of said layers is spectrally sensitized to the red region of the visible light spectrum and the silver halide in another layer is spectrally sensitized to the green region of the visible light spectrum.

Claim 10

a silver halide developing agent located within said film unit, wherein each of said silver halide emulsions comprises unfogged silver halide grains having metal dopants occluded therein, which grains have been chemically sensitized on the surface thereof: a. to a level which will provide a density of less than 0.4 when developed in Kodak Developer DK-50 for 5 minutes at 27*C after imagewise exposure when said photosensitive composition is coated at a coverage of between about 300 to about 400 mg of silver/ft2 and b. to at least a level which would provide a density of 0.5 using undoped silver halide grains of the same grain size and halide composition when coated, exposed and developed in like manner, and

Claim 11

a silver halide developing agent located within said film unit, wherein each of said silver halide emulsions comprises unfogged silver halide grains having metal dopants occluded therein, which grains have been chemically sensitized on the surface thereof: a. to a level which will provide a density of less than 0.4 when developed in Kodak Developer DK-50 for 5 minutes at 27*C after imagewise exposure when said photosensitive composition is coated at a coverage of between about 300 to about 400 mg of silver/ft2 and b. to at least a level which would provide a density of 0.5 using undoped silver halide grains of the same grain size and halide composition when coated, exposed and developed in like manner, and

Claim 12

a fogging agent located in said film unit whereby it will be in contact with said photosensitive composition upon discharge of said processing composition.

Claim 13

a fogging agent located in said film unit whereby it will be in contact with said photosensitive composition upon discharge of said processing composition.

Claim 14

A film unit according to claim 1 wherein said metal dopants are polyvalent metal ions.

Claim 15

A film unit according to claim 1 wherein said metal dopant is comprised of sulfur and gold.

Claim 16

A film unit according to claim 1 whrein said fogging agent is a hydrazine compound.

Claim 17

A film unit according to claim 1 wherein said fogging agent is a reactive N-substituted, cycloammonium quaternary salt.

Claim 18

A film unit according to claim 1 wherein said image-receiving layer is located in said unit between said photosensitive composition and the support for said photosensitive composition.

Claim 19

A film unit according to claim 1 wherein said image-receiving layer is coated on a support and is adapted to be superposed on a support carrying said photosensitive composition after exposure thereof.

Claim 20

A film unit according to claim 1 wherein said metal dopant is composed of sulfur aNd gold and said unfogged silver halide grains are chemically sensitized on the surface thereof with a sulfur compound to obtain said level of surface sensitization.

Claim 21

In a process of forming a transfer image, the improvement comprising: I. imagewise-exposing a photosensitive element comprising a support having thereon at least one layer of a photosensitive composition having associated therewith an initially immobile image dye-providing material and silver halide grains having metal dopants occluded therein and wherein said halide is predominantly bromide, which grains have been chemically sensitized on the surface thereof (a) to a level which would produce a density of less than 0.4 after imagewise exposure when developed in Kodak Developer DK-50, provided said emulsion is coated at a coverage of between about 300 to about 400 mg of silver per square foot, and (b) to at least a level which would provide a density of 0.5 using undoped silver halide grains of the same grain size and halide composition when coated, exposed and developed in like manner; II. treating said photosensitive element with an alkaline processing composition, which is a silver halide surface developer, in the presence of a fogging agent; and thereby III. effecting development of each of said exposed silver halide emulsion layers, thus causing selective imagewise diffusion of image dye to an image-receiver layer.

Claim 22

In a process of forming a transfer image, the improvement comprising: I. imagewise-exposing a photosensitive element comprising a support having thereon at least one layer of a photosensitive composition having associated therewith an initially immobile image dye-providing material and silver halide grains having metal dopants occluded therein and wherein said halide is predominantly bromide, which grains have been chemically sensitized on the surface thereof (a) to a level which would produce a density of less than 0.4 after imagewise exposure when developed in Kodak Developer DK-50, provided said emulsion is coated at a coverage of between about 300 to about 400 mg of silver per square foot, and (b) to at least a level which would provide a density of 0.5 using undoped silver halide grains of the same grain size and halide composition when coated, exposed and developed in like manner; II. treating said photosensitive element with an alkaline processing composition, which is a silver halide surface developer, in the presence of a fogging agent; and thereby III. effecting development of each of said exposed silver halide emulsion layers, thus causing selective imagewise diffusion of image dye to an image-receiver layer.

Claim 23

A process according to claim 12 wherein said film unit comprises at least three separate layers, each containing said silver halide emulsion and each having associated therewith an initially immobile image dye-providing material.

Claim 24

A process according to claim 12 wherein said silver halide grains have been chemically sensitized on the surface thereof with sulfur-, gold-, or sulfur-and-gold-containing compounds.

Claim 25

In an image-transfer film unit which comprises an image-receiving layer, at least one layer containing a photosensitive composition having associated therewith an initially immobile image dye-providing material, a developing agent and a processing composition which can be discharged to facilitate development of said photosensitive composition by passing said unit between a pair of juxtaposed pressure-applying members, the improvement comprising (1) said photosensitive composition in said film unit being unfogged silver halide grains wherein the halide is predominantly bromide and which have metal dopants comprised of sulfur and gold occluded therein, wherein said grains are chemically sensitized on the surface thereof with a sulfur compound (a) to a level which will provide a density of less than 0.25 in Kodak Developer DK-50 after imagewise exposure when said photosensitive composition is coated at a coverage of between about 300 to about 400 mg of silver per square foot and (b) to at least a level which would provide a density of 0.5 using undoped silver halide grains of the same grain size and halide composition when coated, exposed and developed in like manner, and (2) a fogging agent located in said film unit whereby it will be in contact with said photosensitive composition upon discharge of said processing composition.

Claim 26

In an image-transfer film unit which comprises an image-receiving layer, at least one layer containing a photosensitive composition having associated therewith an initially immobile image dye-providing material, a developing agent and a processing composition which can be discharged to facilitate development of said photosensitive composition by passing said unit between a pair of juxtaposed pressure-applying members, the improvement comprising (1) said photosensitive composition in said film unit being unfogged silver halide grains wherein the halide is predominantly bromide and which have metal dopants comprised of sulfur and gold occluded therein, wherein said grains are chemically sensitized on the surface thereof with a sulfur compound (a) to a level which will provide a density of less than 0.25 in Kodak Developer DK-50 after imagewise exposure when said photosensitive composition is coated at a coverage of between about 300 to about 400 mg of silver per square foot and (b) to at least a level which would provide a density of 0.5 using undoped silver halide grains of the same grain size and halide composition when coated, exposed and developed in like manner, and (2) a fogging agent located in said film unit whereby it will be in contact with said photosensitive composition upon discharge of said processing composition.

Claim 27

An image-transfer film unit according to claim 15 which comprises at least three separate layers containing said photosensitive composition wherein the silver halide of one of said layers is spectrally sensitized to the red region of the visible light spectrum and has associated therewith a cyan image dye-providing material, the silver halide of another layer is spectrally sensitized to the green region of the visible light spectrum and has associated therewith a magenta image dye-providing material, and the silver halide in another layer is sensitive to the blue region of the visible light spectrum and has associated therewith a yellow image dye-providing material.

Claim 28

An image-transfer process according to claim 16 whereIn each of said image dye-providing materials is initially immobile and releases a preformed, diffusible image dye as a function of oxidation followed by hydrolysis.

Claim 29

An image-transfer film unit according to claim 15 wherein said image-receiving layer is coated on the same support as the layers containing said photosensitive composition.

Claim 30

An image-transfer film unit comprising:

Claim 31

An image-transfer film unit comprising:

Claim 32

A film unit according to claim 19 wherein said fogging agent is located in each of said layers containing said silver halide emulsions.

Claim 33

A film unit according to claim 19 wherein each of said layers containing said silver halide emulsions has associated therewith a benzotriazole antifoggant.

Claim 34

A film unit according to claim 19 wherein said metal dopants are comprised of sulfur and gold and said silver halide grains are sensitized on the surface thereof with a sulfur sensitizer.

Claim 35

A film unit according to claim 21 wherein each of said immobile image dye-providing materials contains a preformed dye moiety.