Photothermographic material
View Patent ↗The invention provides a photothermographic material containing, on a support, an image forming layer having at least a photosensitive silver halide, a non-photosensitive organic silver salt and a reducing agent, and at least one non-photosensitive layer, in which the non-photosensitive layer contains a crosslinking agent precursor, in which the crosslinking agent precursor is a compound which releases a crosslinking agent which crosslinks a binder of the non-photosensitive layer at the time of thermal development. A photothermographic material in which water resistance and scratch resistance of an image have been improved is provided.
1. A photothermographic material comprising an image forming layer comprising at least a photosensitive silver halide, a non-photosensitive organic silver salt, and a reducing agent, and at least one non-photosensitive layer on a support, wherein the non-photosensitive layer comprises a crosslinking agent precursor, in which the crosslinking agent precursor is a compound which releases a crosslinking agent which crosslinks a binder of the non-photosensitive layer at the time of thermal development, wherein the crosslinking agent precursor is a compound represented by the following formula (C-1):
wherein in formula (C-1), X represents an aromatic group or a heterocyclic group; Y represents one selected from an SO 2 NH group, an SO 3 group, a CONH group, a COO group, and an NHNH group; L represents a linking group having a valency of from 2 to 6; and m represents an integer of from 2 to 6.
2. The photothermographic material according to claim 1 , wherein, in formula (C-1), X represents a heterocyclic group, and Y represents an SO 2 NH group.
3. The photothermographic material according to claim 1 , wherein, in formula (C-1), X represents a heterocyclic group, and Y represents an NHNH group.
4. The photothermographic material according to claim 1 , wherein the crosslinking agent precursor is a compound represented by the following formula (C-2):
wherein in formula (C-2), R represents a group substituting for a hydrogen atom on a benzene ring; L represents a linking group having a valency of from 2 to 6; m represents an integer of from 2 to 6; and n represents an integer of from 0 to 5.
5. The photothermographic material according to claim 4 , wherein, in formula (C-2), R represents an electron-attracting group.
6. The photothermographic material according to claim 4 , wherein, in formula (C-2), n represents an integer of from 1 to 3.
7. The photothermographic material according to claim 1 , wherein the crosslinking agent precursor is a compound represented by the following formula (C-3):
wherein in formula (C-3), R represents a group substituting for a hydrogen atom on a benzene ring; L represents a linking group having a valency of from 2 to 6; m represents an integer of from 2 to 6; and n represents an integer of from 0 to 5.
8. The photothermographic material according to claim 7 , wherein, in formula (C-3), R represents an electron-attracting group.
9. The photothermographic material according to claim 7 , wherein, in formula (C-3), n represents an integer of from 1 to 3.
10. The photothermographic material according to claim 1 , wherein the photothermographic material further comprises a compound represented by the following formula (P):
wherein R 1 to R 6 each independently represent a hydrogen atom or a substituent.
11. The photothermographic material according to claim 1 , wherein the binder contains a water-soluble polymer which is derived from non-animal protein in an amount of 50% by weight or more.
12. The photothermographic material according to claim 11 , wherein the water-soluble polymer which is derived from non-animal protein contains any one of a carboxy group or a salt thereof, a thiol group, a phenolic hydroxy group, a carboxylic anhydride group, an epoxy group, an amide group, or an aromatic amino group.
13. The photothermographic material according to claim 12 , wherein the water-soluble polymer which is derived from non-animal protein contains a carboxy group or a salt thereof.
14. The photothermographic material according to claim 1 , wherein the binder contains a water-soluble polymer derived from animal protein in an amount of 50% by weight or more.
15. The photothermographic material according to claim 14 , wherein the water-soluble polymer derived from animal protein is gelatin.
16. The photothermographic material according to claim 11 , wherein less than 50% by weight of the binder is a polymer latex.
17. The photothermographic material according to claim 16 , wherein the polymer latex contains any one of a carboxy group or a salt thereof, a thiol group, a phenolic hydroxy group, a carboxylic anhydride group, an epoxy group, an amide group, or an aromatic amino group.
18. The photothermographic material according to claim 17 , wherein the polymer latex contains a carboxy group or a salt thereof.
19. The photothermographic material according to claim 14 , wherein less than 50% by weight of the binder is a polymer latex.
20. The photothermographic material according to claim 19 , wherein the polymer latex contains any one of a carboxy group or a salt thereof, a thiol group, a phenolic hydroxy group, a carboxylic anhydride group, an epoxy group, an amide group, or an aromatic amino group.
21. The photothermographic material according to claim 20 , wherein the polymer latex contains a carboxy group or a salt thereof.
22. The photothermographic material according to claim 1 , wherein the non-photosensitive layer is a surface protective layer which is on the same side of the support as the image forming layer.
23. The photothermographic material according to claim 1 , wherein the non-photosensitive layer is a back layer which is on an opposite side of the support from the image forming layer.