Black and white photothermographic material

Abstract

The present invention provides a black and white photothermographic material including, on at least one side of a support, at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent for silver ions, a color developing agent, and a coupler which reacts with an oxidation product of the color developing agent to form a dye, wherein a total amount of ammonia included on one side of the support having thereon the photosensitive silver halide is from 5 mg/m2 to 25 mg/m2, and an optical density of an image formed by imagewise exposing and thermally developing the black and white photothermographic material satisfies the following equation (A):

Description

Claims

1. A black and white photothermographic material comprising, on at least one side of a support, at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent for silver ions, a color developing agent, and a coupler which reacts with an oxidation product of the color developing agent to form a dye, wherein a total amount of ammonia included on one side of the support having thereon the photosensitive silver halide is from 5 mg/m2 to 25 mg/m2, and an optical density of an image formed by imagewise exposing and thermally developing the black and white photothermographic material satisfies the following equation (A): 0.02<Dc<D/4   Equation (A)wherein D represents an optical density in a range of from 1 to 2; and Dc represents an optical density obtained by the dye in the optical density of the image.

2. The black and white photothermographic material according to claim 1, wherein the black and white photothermographic material comprises an image forming layer comprising at least the photosensitive silver halide, the non-photosensitive organic silver salt, and the reducing agent, and a non-photosensitive layer comprising at least the color developing agent and the coupler.

3. The black and white photothermographic material according to claim 2, wherein the image forming layer further comprises the color developing agent.

4. The black and white photothermographic material according to claim 1, wherein the color developing agent is a compound represented by the following formula (1):

5. The black and white photothermographic material according to claim 1, wherein the coupler is at least one compound represented by a formula selected from the group consisting of the following formulae (C-1), (C-2), (C-3), (M-1), (M-2), (M-3), (Y-1), (Y-2), and (Y-3):

6. The black and white photothermographic material according to claim 4, wherein, in the compound represented by formula (1), R1a and R2a are each a halogen atom.

7. The black and white photothermographic material according to claim 5, wherein, in the coupler having a structure represented by formula (C-1), (C-2), (C-3), (M-1), (M-2), (M-3), (Y-1), (Y-2), or (Y-3), X1, X2, X3, X4, X5, X6, X7, X8, or X9 is a hydrogen atom.

8. The black and white photothermographic material according to claim 2, wherein 50% by weight or more of a binder in the image forming layer is a polymer latex.

9. The black and white photothermographic material according to claim 8, wherein the polymer latex is a polymer latex comprising a monomer component represented by the following formula (M) within a range of from 10% by weight to 70% by weight: CH2═CR01—CR02═CH2   Formula (M)wherein R01 and R02 each independently represent one selected from a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a halogen atom, or a cyano group.

10. The black and white photothermographic material according to claim 9, wherein, in formula (M), both of R01 and R02 are a hydrogen atom, or one of R01 or R02 is a hydrogen atom and the other is a methyl group.