G - Physics – 03 – C
Patent
G - Physics
03
C
G03C 1/485 (2006.01) G03C 1/08 (2006.01) G03C 1/09 (2006.01) G03C 1/07 (2006.01)
Patent
CA 2117132
Direct-positive photographic elements are comprised of a support and a silver halide emulsion layer containing core-shell silver halide grains comprising a chemically sensitized core and a chemically sensitized shell, wherein at least one of the core and the shell comprises a band of dopant and wherein the dopant is hexacyano ruthenium (II). Preferably, the shell of the core-shell grains is chemically sensitized with both a gold-containing chemical sensitizing agent and a sulfur-containing chemical sensitizing agent and the weight ratio of the gold-containing chemical sensitizing agent to the sulfur-containing chemical sensitizing agent is at least about two to one.
Divulgation d'éléments photographiques autopositifs, comprenant un support et une couche d'émulsion d'halogénure d'argent. Cette couche contient des grains dont le coeur et l'enveloppe sont en halogénure d'argent et sont sensibilisés chimiquement; le coeur et/ou l'enveloppe contiennent une bande de dopant, ce dopant étant de l'hexacyanoruthénium (II). De préférence, l'enveloppe des grains est sensibilisée chimiquement à l'aide d'une substance sensibilisante contenant de l'or et d'une substance sensibilisante contenant du soufre, le rapport des masses de substance contenant de l'or et de substance contenant du soufre étant au moins égal à deux.
Arcus Robert Alexander
Marchetti Alfred Paul
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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