Photothermographic element with core-shell-type silver...

G - Physics – 03 – C

Patent

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G03C 1/498 (2006.01)

Patent

CA 2183872

A negative-acting photothermographic element comprising a support bearing at least one heat-developable photosensitive, image- forming photothermographic emulsion layer comprising: (a) core-shell-type, photosensitive silver halide grains containing a total silver iodide content of less than 4 mole %, the core having a first silver iodide content of from about 4-14 mole %, the shell having a second silver iodide content lower than the silver iodide content of the core; (b) a non-photosensitive reducible source of silver, (c) a reducing agent for the non-photosensitive, reducible source of silver; (d) a binder; and (e) at least one compound selected from the group consisting of: a halogen molecule; an organic haloamide; and hydrobromic acid salts of nitrogen-containing hetorocyclic compounds which are further associated with a pair of bromine atoms.

Elément photothermographique fonctionnant comme un négatif et comportant un support recouvert d'au moins une couche d'émulsion photothermographique formatrice d'images, photosensible, à développement à la chaleur renfermant: (a) des grains d'halogénure d'argent de type noyau-enveloppe, photosensibles, renfermant une teneur totale en iodure d'argent de moins de 4 % en moles, le noyau ayant une première teneur en iodure d'argent d'entre environ 4 % et 14 % en moles, l'enveloppe ayant une seconde teneur en iodure d'argent inférieure à celle du noyau; (b) une source d'argent réductible non photosensible; (c) un réducteur pour ladite source d'argent réductible non photosensible; (d) un liant; et (e) au moins un composé choisi parmi le groupe composé de: une molécule halogénée; un haloamide organique, et des sels d'acide bromhydrique de composés hétérocycliques renfermant de l'azote, également associés à une paire d'atomes de brome.

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