Novel silver compound and composition, thermal developing material comtaining it and preparing method
A technology of silver compounds and compounds, applied in the field of new silver compounds, can solve problems such as ineffectiveness
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preparation example Construction
[0316] Preparation of core-shell silver halide grains with silver chloride shells:
[0317] The following describes the preparation of core-shell silver halide grains having an inner region of silver iodobromide, an outer region of silver bromide and a shell of silver chloride.
[0318] A photosensitive iridium-doped silver halide grain having an inner region of silver iodobromide and an outer region of silver bromide was prepared substantially as described in U.S. Patent 5,939,249 (Zou).
[0319] At 36°C, 75 g of phthalated gelatin, 1650 g of deionized water, defoamer, 0.5 mol of the photosensitive iridium-doped silver halide grains prepared above and enough Adjust the pH to 5.0 with nitric acid. Connect the silver / silver bromide electrode. Solution A and solution B were added simultaneously while vAg was kept constant at 25 mV throughout the addition. The temperature of the reactor was also kept constant at 36°C throughout the addition.
[0320] Solution A was prepared ...
Embodiment 1
[0361] Example 1: Preparation of Photothermographic Materials
[0362] Each photothermographic emulsion prepared above was homogenized to 28.1% solids in MEK with Pioloform BS-18 polyvinyl butyral binder (4.4% solids). To 192 parts of this emulsion was added 1.6 parts of a 15% solution of pyridinium hydrobromide perbromide in methanol under stirring. After mixing for 60 minutes, 2.1 parts of an 11% zinc bromide solution in methanol were added. Stirring was continued, and after 30 minutes, 0.15 parts of 2-mercapto-5-methylbenzimidazole, 0.007 parts of sensitizing dye A, 1.7 parts of 2-(4-chlorobenzoyl)benzoic acid, 10.8 parts of A solution of methanol and 3.8 parts of MEK.
[0363]After stirring for an additional 75 minutes, 41 parts of Pioloform BL-16 were added, the temperature was lowered to 10°C, and mixing was continued for an additional 15 minutes.
[0364] At this time, by adding solution A, LOWINOX TM , Solution B, and Solution C were added thereto to complete the...
Embodiment 2
[0391] Example 2: Example of thermographic development
[0392] The following experiments were performed in a darkroom under a green safelight. The samples prepared above were placed on a hot wedge (Reichert Hot Bench TM ) for 15 seconds and immediately thermally quenched on a radiator (room temperature). Measure the temperature at which thermography (Tonset) starts. The results shown in Table II below demonstrate that core-shell silver compounds prepared by exchange of the halogen from the silver halide shell to form a non-photosensitive silver salt shell overlying the photosensitive silver halide core provide near-common thermographic materials with The imaging performance of those thermosensitive imaging materials.
[0393] sample
[0394] It is also believed that silver compounds prepared by exchange of halogens from homogeneous (non-core-shell) silver halides to form non-photosensitive silver salts also provide thermographic elements with acceptable imaging...
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