# US 4,396,711 A · Speed-increasing adjuvants for silver halide emulsions

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- Number: US 4,396,711 A
- Document ID: US4396711A
- Status: Granted
- Kind: A
- Application number: 06/363,378
- Filed: 1982-03-29
- Granted: 1983-08-02
- Earliest claimed: 1982-03-29
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Joseph D. Overman
- Web page: https://patentgrep.com/patent/US4396711A

## CPC

- G03C 1/346: {Organic derivatives of bivalent sulfur, selenium or tellurium}
- G03C 1/10: Organic substances {(G03C1/061, G03C1/067 take precedence)}
- 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

Derivatives of thiazolidine are used in photographic silver halide emulsions to increase their speed 40% or more with little or no increase in emulsion fog. Lower silver halide coating weights are thus possible.

## Claims

### Claim 1

A photographic film comprising
(1) a support, and
(2) a radiation-sensitive, colloid-silver halide emulsion layer containing a sensitizing amount of a compound selected from the group consisting of ##STR13## wherein R is an alkyl of 1-4 carbon atoms; ##STR14## wherein R' is a member of the group consisting of ##STR15## and the hydrochloride salts thereof.

### Claim 2 (depends on 1)

The photographic film of claim 1 wherein said compound is present in the silver halide emulsion in an amount of 5-30 mg per 1.5 moles of silver halide.

### Claim 3 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR16##

### Claim 4 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR17##

### Claim 5 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula HS--CH.sub.2 --CH.sub.2 --NH.sub.2.HCl.

### Claim 6 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR18##

### Claim 7 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR19##

### Claim 8 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR20##

### Claim 9 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR21##

### Claim 10 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR22##

### Claim 11 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR23##

### Claim 12 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR24##

### Claim 13 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR25##

### Claim 14 (depends on 1)

The photographic film of claim 1 wherein said compound has the formula ##STR26##