Photothermographic material and image forming method for the photothermographic material
View Patent ↗A photothermographic material, comprising at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, wherein a total silver iodide content of the photosensitive silver halide is 40% by mole or more and thermal development is started within 60 sec after exposure.
1. An image forming method with a photothermographic sheet material, comprising imagewise exposing and thermally developing the photothermographic sheet material;
wherein the photothermographic sheet material comprises at least a photosensitive silver halide having an average silver iodide content of 40% by mole or more, a non-photosensitive organic silver salt, a reducing agent and a binder, and a compound expressed by the following formula (H):
Q-(Y) N —C(Z 1 )(Z 2 )X Formula (H):
wherein Q represents an alkyl group, an aryl group or a hetero ring group; Y represents a divalent linkage group; N represents 0 or 1; Z 1 and Z 2 each independently represent a halogen atom; and X represents a hydrogen atom or an electron-withdrawing group;
and the thermally developing being started within 60 sec after imagewise exposure of the photothermographic sheet material using an image recording apparatus having an exposure portion and a developing portion and wherein the imagewise exposing and thermal developing comprises imagewise exposing a part of the photothermographic sheet material and simultaneously developing a part of the photothermographic sheet material that has already been imagewise exposed.
2. The image forming method according to claim 1 , wherein the photothermographic sheet material is imagewise exposed using a laser.
3. The image forming method according to claim 2 , wherein the laser is a laser diode.
4. The image forming method according to claim 3 , wherein the laser diode has a light-emission peak intensity in the wavelength of 350 nm to 450 nm.
5. The image forming method according to claim 1 , wherein the average silver iodide content of the photosensitive silver halide is 90% by mole or more.
6. The image forming method according to claim 1 , wherein the photosensitive silver halide is formed in the absence of the non-photosensitive organic silver salt.
7. The image forming method according to claim 1 , wherein the thermal development is started within 30 sec after the imagewise exposure.
8. The image forming method according to claim 1 , wherein the thermal development is started within 15 sec after the imagewise exposure.
9. The image forming method according to claim 1 , wherein an average grain size of the photosensitive silver halide is 5 nm to 80 nm.
10. The image forming method according to claim 1 , wherein an average grain size of the photosensitive silver halide is 5 nm to 30 nm.
11. The image forming method according to claim 1 , wherein the photosensitive silver halide is chemically sensitized.
12. The image forming method according to claim 1 , comprising a compound that can be one-electron-oxidized to provide a one-electron oxidation product which releases one or more electrons.
13. The image forming method according to claim 1 , comprising a compound expressed by the following general formula (R):
wherein R 11 and R 11′ each independently represents an alkyl group having 1 to 20 carbon atoms, R 12 and R 12′ each independently represents a hydrogen atom or a group capable of substituting for a hydrogen atom on a benzene ring, L represents a —S— group or a —CHR 13 — group, R 13 represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, and X 1 and X 1′ each independently represents a hydrogen atom or a group capable of substituting for a hydrogen atom on a benzene ring.
14. The image forming method according to claim 1 , comprising a developing accelerator.
15. The image forming method according to claim 1 , comprising a hydrogen bonding compound.