Photothermographic material
The invention provides a photothermographic material including, on a same surface of a substrate, a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent, a development accelerator and a binder, the material containing, as the binder, a polymer formed by copolymerizing a monomer represented by the following general formula (M) in an amount from 10 to 70 mass %: CH 2 ═CR 01 —CR 02 ═CH 2 General formula (M) wherein R 01 represents a hydrogen atom, an alkyl group with 1 to 6 carbon atoms, a halogen atom, or a cyano group; and R 02 represents an alkyl group with 1 to 6 carbon atoms, a halogen atom or a cyano group (both R 01 and R 02 are not hydrogen atoms at the same time).
1 . A photothermographic material comprising, on a same surface of a substrate, a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent, a development accelerator, and a binder, wherein said binder is dispersed as a latex and the material comprises, as said binder, a polymer formed by copolymerizing a monomer represented by the following general formula (M) in an amount from 10 to 70 mass %:
CH 2 ═CR 01 —CR 02 ═CH 2 General formula (M)
wherein in general formula (M), R 01 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom; and R 02 represents an alkyl group having 1 to 6 carbon atoms, or a halogen atom.
2 . A photothermographic material according to claim 1 , wherein said development accelerator is a compound selected from compounds represented by the following general formula (A-1):
Q 1 -NHNH-Q 2 General formula (A-1):
wherein in general formula (A-1), Q 1 represents an aromatic group or a heterocyclic group bonded by a carbon atom thereof to —NHNH-Q 2 ; and Q 2 represents a carbamoyl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfonyl group or a sulfamoyl group.
3 . A photothermographic material according to claim 1 , wherein said development accelerator is a compound selected from compounds represented by the following general formula (A-2):
wherein in general formula (A-2), R 1 represents an alkyl group, an acyl group, an acylamino group, a sulfonamide group, an alkoxycarbonyl group, or a carbamoyl group; R 2 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an acyloxy group or a carbonate ester group; and R 3 and R 4 each independently represent a group that can substitute the benzene ring and may be mutually bonded to form a condensed ring.
4 . A photothermographic material according to claim 1 , wherein said non-photosensitive organic silver salt is an organic acid silver salt with a content of silver behenate equal to or higher than 90 mol. %.
5 . A photothermographic material according to claim 1 , wherein said non-photosensitive organic silver salt is an organic acid silver salt with a content of silver behenate equal to or higher than 95 mol. %.
6 . A photothermographic material according to claim 1 , wherein said polymer has a glass transition temperature within a range from −30° to 70° C.
7 . A photothermographic material according to claim 1 , wherein said polymer has a glass transition temperature within a range from −10° to 35° C.
8 . A photothermographic material according to claim 1 , wherein said reducing agent is a compound represented by the following general formula (R):
wherein in general formula (R), R 11 and R 11′ each independently represent an alkyl group having 1 to 20 carbon atoms; R 12 and R 12′ each independently represent a hydrogen atom or a substituent that can substitute the benzene ring; L represents an —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 represent a hydrogen atom or a group that can substitute the benzene ring.
9 . A photothermographic material according to claim 8 , wherein, in the reducing agent represented by general formula (R), R 11 and R 11′ each independently represent a secondary or tertiary alkyl group having 3 to 15 carbon atoms.
10 . A photothermographic material according to claim 1 , further comprising a phthalocyanine dye.
11 . A photothermographic material according to claim 1 , wherein in general formula (M), R 01 is a hydrogen atom and R 02 is a methyl group.
12 . A photothermographic material according to claim 1 , wherein said polymer is formed by copolymerizing a monomer having an acid group in an amount from 1 to 20 mass %.
13 . A photothermographic material comprising, on a same surface of a substrate, a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, wherein said binder is dispersed as a latex and the material comprises as said binder, a polymer latex formed by copolymerizing a monomer represented by the following general formula (M) in an amount from 10 to 70 mass % and having a number-averaged particle size (dn) from 30 to 500 nm:
CH 2 ═CR 01 —CR 02 ═CH 2 General formula (M)
wherein in general formula (M), R 01 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom; and R 02 represents an alkyl group having 1 to 6 carbon atoms, or a halogen atom.
14 . A photothermographic material according to claim 13 , wherein the polymer latex has a ratio (dv/dn) of a volume-weighted average particle size (dv) to a number-averaged particle size (dn) within a range from 1.00 to 1.10.
15 . A photothermographic material according to claim 13 , wherein the polymer latex contains halogen ions in an amount of 500 ppm or less with respect to the latex.
16 . A photothermographic material comprising, on a same surface of a substrate, a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, wherein said binder is dispersed as a latex and the material comprises, as said binder, a polymer latex formed by copolymerizing a monomer represented by the following general formula (M) in an amount from 10 to 70 mass %, and emulsion polymerized with a peroxide as a polymerization initiator in an amount of 0.3 to 2 mass % with respect to the monomer:
CH 2 ═CR 01 —CR 12 ═CH 2 General formula (M)
wherein in general formula (M), R 01 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom; and R 02 represents an alkyl group having 1 to 6 carbon atoms, or a halogen atom.
17 . A photothermographic material according to claim 16 , wherein said polymer latex includes halogen ions in an amount of 500 ppm or less with respect to the latex.
18 . A photothermographic material according to claim 13 , wherein said polymer latex has a glass transition temperature within a range from −30° to 70° C.
19 . A photothermographic material according to claim 13 , wherein, in said general formula (M), R 01 is a hydrogen atom and R 02 is a methyl group.
20 . A photothermographic material according to claim 13 , wherein said polymer is formed by copolymerizing a monomer having an acid group in an amount from 1 to 20 mass %.
21 . A photothermographic material according to claim 13 , comprising halogen ions in an amount of 1000 ppm or less with respect to the organic silver salt.
22 . A photothermographic material according to claim 1 , wherein R 01 is selected from a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R 02 is an alkyl group having 1 to 6 carbon atoms.
23 . A photothermographic material according to claim 1 , wherein R 01 is selected from a hydrogen atom or a methyl group, and R 02 is a methyl group.
24 . A photothermographic material according to claim 13 , wherein R 01 is selected from a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R 02 is an alkyl group having 1 to 6 carbon atoms.
25 . A photothermographic material according to claim 13 , wherein R 01 is selected from a hydrogen atom or a methyl group, and R 02 is a methyl group.
26 . A photothermographic material according to claim 16 , wherein R 01 is selected from a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R 02 is an alkyl group having 1 to 6 carbon atoms.
27 . A photothermographic material according to claim 16 , wherein R 01 is selected from a hydrogen atom or a methyl group, and R 02 is a methyl group.