| 摘要 |
PROBLEM TO BE SOLVED: To provide improved aqueous-based photothermographic materials which provide reduced image print out. SOLUTION: This thermally developable emulsion includes (a) photosensitive silver halide core-shell grains, (b) a non-photosensitive source of reducible silver ions, (c) a hydrophilic binder, (d) a reducing agent composition for the reducible silver ions, and (e) a cyclic imide, benzoxazinedione, benzothiazinedione, triazolethione, quinazolinedione or phthalazinone as a development accelerator. Almost all of the photosensitive silver halide core-shell grains comprise at least 20 mol% iodide on the basis of total silver, the amount of iodide in the core of the grains can be up to the iodide saturation limit in silver iodobromide, and the amount of iodide in the shell of the grains is at least 2 mol% less than the amount of iodide present in the core, and further, the total amount of silver in the shell is 10 to 80 mol% of total silver in the grains. COPYRIGHT: (C)2005,JPO&NCIPI
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