# US 5,705,312 A · Photograph system

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- Number: US 5,705,312 A
- Document ID: US5705312A
- Status: Granted
- Kind: A
- Application number: 08/755,702
- Filed: 1996-11-25
- Granted: 1998-01-06
- Earliest claimed: 1996-02-09
- Assignees: Polaroid Corporation
- Inventors: Donna J. Guarrera; Neil C. Mattucci; Avinash C. Mehta; Lloyd D. Taylor; John C. Warner
- Web page: https://patentgrep.com/patent/US5705312A

## CPC

- G03C 5/305: Additives other than developers {(G03C5/264 takes precedence)}
- G03C 1/295: Development accelerators
- G03C 8/08: the substances transferred by diffusion consisting of organic compounds (G03C8/04 takes precedence)
- G03C 8/36: Developers
- G03C 8/52: Bases or auxiliary layers; Substances therefor
- G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G)

## Abstract

There is described a photographic system wherein development of an exposed photosensitive element is carried out in the presence of a quaternary pyridinium compound which has a fused 5 - to 12 - member saturated carbocyclic ring attached to the 2 and 3 positions of the pyridine ring.

## Claims

### Claim 1

A photographic method comprising the steps of exposing a photosensitive element which contains at least one silver halide emulsion layer in association with an image dye-providing material and developing said exposed photosensitive element with an aqueous alkaline processing composition in the presence of a quaternary pyridinium compound represented by the formula ##STR17## wherein: X represents the carbon atoms necessary to complete a 5 - to 12 - member saturated carbocyclic ring;
R is hydrogen, alkyl having from 1 to 4 carbon atoms or alkoxy having from 1 to 4 carbon atoms;
R.sub.1 is alkyl having from 1 to 6 carbon atoms, alkoxyalkyl having from 2 to 8 carbon atoms represented by ##STR18## wherein: R.sub.2 is hydrogen or alkyl having from 1 to 3 carbon atoms, R.sub.3 is alkyl having from 1 to 4 carbon atoms, and m is an integer from 1 to 4, aryl or alkaryl represented by ##STR19## where n is an integer from 0 to 3; or ##STR20## wherein: Y represents the carbon atoms necessary to complete a 5 - or 6 - member heterocyclic moiety, and p is an integer from 1 to 3; and
Z is a photographically acceptable counterion, whereby an image is formed.

### Claim 2 (depends on 1)

The method as defined in claim 1 wherein said photosensitive element comprises a support carrying:
(a) said silver halide emulsion layer;
(b) a second sheet-like element which is superposed or superposable on said photosensitive element;
(c) an image-receiving layer positioned in one of said photosensitive or second sheet-like elements; and
(d) a rupturable container releasably holding said aqueous alkaline processing composition and so positioned as to be adapted to distribute said aqueous alkaline processing composition between predetermined layers of said elements.

### Claim 3 (depends on 1)

The method as defined in claim 1 wherein said photosensitive element comprises a red-sensitive silver halide emulsion layer in association with a cyan image dye-providing material, a green-sensitive silver halide emulsion layer in association with a magenta image dye-providing material and a blue-sensitive silver halide emulsion layer in association with a yellow image-dye providing material.

### Claim 4 (depends on 1)

The method as defined in claim 1 wherein said quaternary pyridinium compound is initially present in said aqueous alkaline processing composition.

### Claim 5 (depends on 1)

The method as defined in claim 1 wherein said quaternary pyridinium compound is represented by the formula ##STR21## wherein R, R.sub.1, and Z are as previously defined.

### Claim 6 (depends on 1)

The method as defined in claim 1 wherein said quaternary pyridinium compound is represented by the formula ##STR22## wherein R, R.sub.1, and Z are as previously defined.

### Claim 7 (depends on 1)

The method as defined in claim 1 wherein R.sub.1 is C.sub.2 H.sub.5.

### Claim 8 (depends on 7)

The method as defined in claim 7 wherein Z is ##STR23##

### Claim 9

A diffusion transfer photographic film unit comprising
(a.) a photosensitive element comprising a support carrying at least one silver halide emulsion layer;
(b.) a second sheet-like element which is superposed or superposable on said photosensitive element;
(c.) an image-receiving layer positioned in one of said photosensitive or second sheet-like elements;
(d.) a rupturable container releasably holding an aqueous alkaline processing composition and so positioned as to be adapted to distribute said aqueous alkaline processing composition between predetermined layers of said elements; and
(e.) a quaternary pyridinium compound represented by the formula ##STR24## wherein: X represents the carbon atoms necessary to complete a 5 - to 12 - member saturated carbocyclic ring;
R is hydrogen, alkyl having from 1 to 4 carbon atoms or alkoxy having from 1 to 4 carbon atoms;
R.sub.1 is alkyl having from 1 to 6 carbon atoms, alkoxyalkyl having from 2 to 8 carbon atoms represented by ##STR25## wherein: R.sub.2 is hydrogen or alkyl having from 1 to 3 carbon atoms, R.sub.3 is alkyl having from 1 to 4 carbon atoms, and m is an integer from 1 to 4, aryl or alkaryl represented by ##STR26## where n is an integer from 0 to 3; or ##STR27## wherein: Y represents the carbon atoms necessary to complete a 5 - or 6 - member heterocyclic moiety, and p is an integer from 1 to 3; and
Z is a photographically acceptable counterion.

### Claim 10 (depends on 9)

The film unit as defined in claim 9 wherein said quaternary pyridinium compound is present in said aqueous alkaline processing composition.

### Claim 11 (depends on 9)

The film unit as defined in claim 9 wherein said image-receiving layer is located in said second sheet-like element.

### Claim 12 (depends on 11)

The film unit as defined in claim 11 further including a strip-coat layer overlying said image-receiving layer.

### Claim 13 (depends on 9)

The film unit as defined in claim 9 wherein said photosensitive element includes an image dye-providing material in association with said silver halide emulsion layer.

### Claim 14 (depends on 13)

The film unit as defined in claim 13 wherein said photosensitive element comprises a support carrying a red-sensitive silver halide emulsion having a cyan image dye-providing material associated therewith, a green-sensitive silver halide emulsion layer having a magenta image dye-providing material associated therewith and a blue-sensitive silver halide emulsion layer having a yellow image dye-providing material associated therewith.

### Claim 15 (depends on 13)

The film unit as defined in claim 13 wherein said quaternary pyridinium compound is represented by the formula ##STR28## wherein R, R.sub.1, and Z are as previously defined.

### Claim 16 (depends on 13)

The film unit as defined in claim 13 wherein said quaternary pyridinium compound is represented by the formula ##STR29## wherein R, R.sub.1, and Z are as previously defined.

### Claim 17 (depends on 9)

The film unit as defined in claim 9 wherein R.sub.1 is C.sub.2 H.sub.5.

### Claim 18 (depends on 17)

The film unit as defined in claim 17 wherein Z is ##STR30##