Photothermographic material
A photothermographic material which includes, on at least one side of a support, an image forming layer containing a photosensitive silver halide, a non-photosensitive organic silver salt and a reducing agent for the organic silver salt, and at least one non-photosensitive layer, wherein the photothermographic material contains a water-soluble dye and a fixing agent for the water-soluble dye.
1 . A photothermographic material comprising, on at least one side of a support, an image forming layer comprising a photosensitive silver halide, a non-photosensitive organic silver salt and a reducing agent for the organic silver salt, and at least one non-photosensitive layer, wherein the photothermographic material comprises a water-soluble dye and a fixing agent for the water-soluble dye.
2 . The photothermographic material according to claim 1 , wherein the fixing agent is at least one selected from compounds having a tertiary amino group or a quaternary amino group, and polyvalent metal salts.
3 . The photothermographic material according to claim 2 , wherein the fixing agent is a polymer compound comprising at least one vinyl monomer unit having a tertiary amino group or a quaternary amino group and represented by the following formulae (FX-1), (FX-2), (FX-3) or (FX-4):
wherein R 1 represents a hydrogen atom or a lower alkyl group having 1 to 6 carbon atoms; L represents a bivalent linking group having 1 to 20 carbon atoms; E represents a heterocyclic group containing, as a constituent component thereof, a nitrogen atom having a double bond to a carbon atom; and n is 0 or 1;
wherein R 1 , L and n have the same respective meanings as in the formula (FX-1); and R 4 and R 5 each independently represent an alkyl group having 1 to 12 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, and R 4 and R 5 may link to each other to form, together with a nitrogen atom, a cyclic structure;
wherein R 1 , L and n have the same respective meanings as in the formula (FX-1); G + represents a heterocycle containing, as a constituent component thereof, a quaternary nitrogen atom having a double bond to a carbon atom; and X − represents a monovalent anion;
wherein R 1 , L and n have the same respective meanings as in the formula (FX-1); R 4 and R 5 have the same respective meanings as in the formula (FX-2); R 6 is selected from the same groups as represented by R 4 and R 5 ; X − has the same meaning as in the formula (FX-3); and any of R 4 , R 5 and R 6 may link to each other to form, together with a nitrogen atom, a cyclic structure.
4 . The photothermographic material according to claim 2 , wherein the fixing agent is a cationic surfactant or a betaine surfactant.
5 . The photothermographic material according to claim 2 , wherein the fixing agent is the polyvalent metal salt.
6 . The photothermographic material according to claim 1 , wherein the image forming layer comprises the water-soluble dye and the fixing agent for the water-soluble dye.
7 . The photothermographic material according to claim 1 , wherein the non-photosensitive layer comprises the water-soluble dye and the fixing agent for the water-soluble dye.
8 . The photothermographic material according to claim 7 , wherein the non-photosensitive layer is a back layer.
9 . The photothermographic material according to claim 1 , wherein the water-soluble dye is a metal phthalocyanine dye represented by the following formula (PC-1):
wherein M represents a metal atom; R 1 , R 4 , R 5 , R 8 , R 9 , R 12 , R 13 and R 16 each independently represent a hydrogen atom or a substituent, and at least one out of R 1 , R 4 , R 5 , R 8 , R 9 , R 12 , R 13 and R 16 is an electron-attracting group; and R 2 , R 3 , R 6 , R 7 , R 10 , R 11 , R 14 and R 15 each independently represent a hydrogen atom or a substituent.
10 . The photothermographic material according to claim 9 , wherein at least one out of R 1 , R 4 , R 5 , R 8 , R 9 , R 12 , R 13 and R 16 in the metal phthalocyanine represented by the formula (PC-1) is a group represented by the following formula (II):
-L 1 -R 17 Formula (II)
wherein L 1 represents **—SO 2 —*, **—SO 3 —*, **—SO 2 NR N —*, **—SO—*, **—CO—*, **—CONR N —*, **—COO—*, **—COCO—*, **—COCO 2 —*, or **—COCONR N —* wherein ** means that the group links to the phthalocyanine skeleton at this position, * means that the group links to R 17 at this position, and R N represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, an acyl group, an alkoxycarbonyl group, a carbamoyl group, a sulfonyl group, or a sulfamoyl group; and R 17 represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group.
11 . The photothermographic material according to claim 10 , wherein four or more out of R 1 , R 4 , R 5 , R 8 , R 9 , R 12 , R 13 and R 16 in the metal phthalocyanine compound represented by the formula (PC-1) are each a group represented by the formula (II).
12 . The photothermographic material according to claim 1 , wherein the layer containing the fixing agent contains a polymer latex.
13 . The photothermographic material according to claim 12 , wherein the polymer latex contains, as a monomer component, 3% or more by mole of a monomer having a dissociating group.
14 . The photothermographic material according to claim 12 , wherein the glass transition temperature (Tg) of the polymer latex is from −30 to 30° C.
15 . The photothermographic material according to claim 12 , wherein the layer containing the fixing agent contains the polymer latex in an amount of 5% to 40% by mass with respect to a binder in the layer.