# US 6,294,319 B1 · Silver halide photographic emulsion

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- Number: US 6,294,319 B1
- Document ID: US6294319B1
- Status: Granted
- Kind: B1
- Application number: 09/327,125
- Filed: 1999-06-07
- Granted: 2001-09-25
- Earliest claimed: 1998-06-10
- Assignees: Konica Corporation
- Inventors: Toshiya Kondo; Norio Miura
- Web page: https://patentgrep.com/patent/US6294319B1

## CPC

- G03C 1/015: Apparatus or processes for the preparation of emulsions (coating, drying G03C1/74 {; G03C1/07 takes precedence; special processes for tabular grains G03C1/0051})
- G03C 1/0051: {Tabular grain emulsions}
- G03C 2200/43: Process
- 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

A method for preparing a silver halide emulsion is disclose, wherein during the course of preparing a silver halide emulsion, a compound having a group capable of releasing a bromide ion or iodide ion and represented by the following formula is used: {X—(L1)n1}n2—L2—(SOL)m wherein X represents a chlorine atom or a bromine atom; L1 and L2 each represent a bivalent linkage group; SOL represents a water-solubilizing group.

## Claims

### Claim 1

A method for preparing a silver halide emulsion comprising the steps of:
(1) forming a silver halide grain emulsion,
(2) subjecting the formed silver halide emulsion to desalting to remove soluble salts,
(3) subjecting the silver halide emulsion to spectral and/or chemical sensitization, and
(4) preparing a coating solution using the spectrally and/or chemically sensitized silver halide emulsion, wherein in any of the steps (1) to (4), a compound represented by the following formula (I) is incorporated into the silver halide emulsion:
{X—(L1)n1}n2—L2—(SOL)m formula (I)
wherein
X represents a chlorine atom or a bromine atom;
L1 is represented by formula (II):
—C(R1)(R2)—CH(R3)—EWG— formula (II)
wherein R1, R2 and R3 each represent a hydrogen atom or a substituent; and EWG represents —COO—, —OCO—, —SO2—, —CON(R4)—, —N(R4)CO—, —CSN(R4)—, —N(R4)CS—, —N(R4)—, —O—, —S—, —CO—, —CS—, —COCO—, —SO2N(R4)— or —N(R4)SO2—, in which R4 represents a hydrogen atom, an alkyl group or an aryl group;
L2 represents a bivalent linkage group, which is an aromatic group;
SOL represents a water-solubilizing group;
n1 is 1; and
m and n2 each are an integer of 1 to 4.

### Claim 2 (depends on 1)

The method of claim 1, wherein SOL represents a carboxy group, sulfo group, hydroxy group or quaternary ammonium group.

### Claim 3 (depends on 1)

The method of claim 1, wherein in step (1), said compound is incorporated into the silver halide emulsion after reaching 80% of the final grain, based on silver.

### Claim 4 (depends on 1)

The method of claim 1, wherein the compound is incorporated into the emulsion after completing step (2) and before starting step (3), or after completing step (3) and before stating step (4).

### Claim 5 (depends on 1)

The method of claim 1, wherein the compound is incorporated in an amount of, 1×10−7 to 30 mol %, based on silver halide.

### Claim 6 (depends on 1)

The method of claim 1, wherein the incorporated compound is allowed to react with a base or a nucleophilic reagent to release a chloride or bromide ion.

### Claim 7 (depends on 1)

The method of claim 1, wherein the silver halide emulsion formed in step (1) comprises tabular silver halide grains.

### Claim 8 (depends on 7)

The method of claim 7, wherein said tabular grains each have dislocation lines.

### Claim 9 (depends on 1)

The method of claim 1, wherein the silver halide emulsion used in step (4) comprises silver halide grains which have been subjected to reduction sensitization.

### Claim 10 (depends on 1)

The method of claim 1, wherein L2 is a phenylene group.

### Claim 11 (depends on 1)

The method of claim 1, wherein in formula (I) L2 is a phenylene group; and
SOL is a carboxy group, a sulfo group, an hydroxy group or a quaternary ammonium group.