Photothermographic material and image forming method
View Patent ↗The present invention relates to a photothermographic material including, on a same surface of a support, a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, wherein the photosensitive silver halide has a silver iodide content within a range from 40 to 100 mol %, and the material is thermally developed within a developing time of 12 seconds or less. The invention also relates to an image forming method using the photothermographic material.
1. An image forming method comprising:
image-wise exposing to a blue semiconductor laser which has a light emission peak intensity within a wavelength range of 350 to 450 nm a photothermographic material comprising, on a same surface of a support, a photosensitive silver halide having a silver iodide content of 40 to 100 mol %, a non-photosensitive organic silver salt of an aliphatic carboxylic acid including a silver behenate, a reducing agent, a binder, and an adsorbable redox compound represented by Formula (I), wherein, in Formula (I), A represents a group that can be adsorbed by silver halide; W represents a divalent connecting group; n represents 0 or 1; B represents a reducing group that is capable of reducing silver ions and is a residue derived from a compound represented Formula B 13 ; and
thermally developing the image-wise exposed photothermographic material with a developing time of 1 to 12 seconds and with a developing temperature of 110° C. to 140° C.;
wherein in Formula B 13 , R b13 , represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; R H13 represents a hydrogen atom, an alkyl group, an aryl group, an acyl group, an alkylsulfonyl group or an arylsulfonyl group; R b130 to R b133 each independently represent a hydrogen atom or a substituent;
A-(W) n —B Formula (1)
wherein the photothermographic material further includes a compound represented by the following formula (H):
Q-(Y) n —C(Z 1 )(Z 2 )X Formula (H)
wherein in formula (H), Q represents an alkyl group, an aryl group or a heterocyclic group; Y represents a divalent connecting 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 attracting group
and wherein the reducing agent is a compound represented by the following formula (R-1):
wherein in formula (R-1), 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 an alkyl group having 2 to 20 carbon atoms; 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; X 1 and X 1 ′ each independently represent a hydrogen atom or a group that can substitute a benzene ring.
2. The image forming method according to claim 1 , wherein the developing time is 2 to 10 seconds.
3. The image forming method according to claim 1 , wherein the thermal development is conducted at a temperature of 110° C. to 130° C.
4. The image forming method according to claim 1 , wherein the photothermographic material further includes an antifogging agent.
5. The image forming method according to claim 1 , wherein the photosensitive silver halide has an average grain size of 5 to 50 nm.
6. The image forming method according to claim 1 , wherein the photothermographic material further includes a development accelerator.
7. The image forming method according to claim 1 , wherein the photothermographic material further includes a toning agent.
8. The image forming method according to claim 1 , wherein the photothermographic material further includes an ultra-high contrast agent.
9. The image forming method according to claim 1 , wherein the photothermographic material further includes a matting agent.
10. The method of claim 1 wherein the silver halide has a silver iodide content of 80 to 100 mol %.
11. The method of claim 1 wherein the silver halide has a silver iodide content of 90 to 100 mol %.
12. The method of claim 1 , wherein an adsorbable group represented by A is a mercapto group, a salt thereof, a thion group (—C(═S)—), a heterocyclic group containing at least an atom selected from a nitrogen atom, a sulfur atom, a selenium atom and a tellurium atom, a sulfide group, a disulfide group, a cationic group, or an ethynyl group.
13. The method of claim 1 , wherein the adsorbable redox compound is represented by any of the following formulas (71) to (79):
14. The method of claim 1 , wherein the photothermographic material further comprises a compound represented by the following formula (H):
Q-(Y) n —C(Z 1 )(Z 2 )X Formula (H)
wherein in formula (H), X is a bromine atom; Y is SO 2 ; N is 1; and Q is an aryl group or a heterocyclic group.
15. The method of claim 1 , wherein the photothermographic material is thermally developed by a plate heater.