Patent ID: 6770428
Filing Date: 2004-08-03
Classification: G03C,Y10S

Abstract:
A photothermographic material comprising a support having thereon at least one imaging layer comprising a hydrophilic binder, and having in reactive association:a) core-shell grains of a photosensitive silver halide, b) a non-photosensitive source of reducible silver ions, c) a reducing agent composition for said reducible silver ions, and d) a cyclic imide, benzoxazine dione, benzthiazine dione, triazole thione, quinazoline dione, or phthalazinone as a development promoter, wherein predominantly all of said core-shell photosensitive silver halide grains comprise from about 20 to about 35 mol % iodide based on total silver in said rains, the amount of iodide in the core of said grains is from 21 mol % and up to the iodide saturation limit in based on total silver in said cores, and the amount of iodide in the shell of said grains is at least 2 mol % less than the amount of iodide present in said core, and further provided that the total amount of silver in said shell is from about 10 to about 40 mol % of total silver in said grains.