Silver halide photographic element containing blended grains
AssigneeEastman Kodak Company
InventorDavid J. Locker
Life of this patent
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Abstract
A photographic element is disclosed comprised of a support and, coated on the support, at least one radiation-sensitive layer. The radiation-sensitive layer contains silver halide grains including a spectral sensitizer adsorbed on the surface thereof and, intimately admixed therewith, silver halide grains free of surface spectral sensitization and having a particle size in the range of 0.15 to 0.8 micron in diameter. The photographic element exhibits improved speed without a concurrent increase in graininess.
Claims9
A photographic element comprising a support and, coated thereon, a radiation-sensitive layer containing
- silver halide grains having a mean particle size greater than about 0.9 micron in diameter and having 3,3',9-triethyl-5,5'-diphenyloxacarbocyanine bromide and anhydro-5,5',-6,6'-tetrachloro-1,1',3-triethyl-3'-(3-sulfobutyl)-benzimida zolocarbocyanine hydroxide as spectral sensitizers adsorbed on the surface thereof and
- intimately admixed therewith reflecting silver halide grains free of surface spectral sensitization and having a particle size greater than 0.40 micron and less than 0.60 micron in diameter, which, upon exposure, cause electromagnetic radiation to impact upon the surface of the spectrally sensitized silver halide grains.
A photographic element comprising a support and, coated thereon, a radiation-sensitive layer containing
- from 10 to 90 percent, by weight, based on total silver halide present, of silver bromoiodide grains having a mean particle size greater than about 0.9 micron in diameter and having 3,3',9-triethyl-5,5'-diphenyloxacarbocyanine bromide and anhydro-5,5',6,6'-tetrachloro-1,1',3-triethyl-3'-(3-sulfobutyl)-benzimidaz olocarbocyanine hydroxide as spectral sensitizers adsorbed on the surface thereof, and
- from 10 to 90 percent, by weight, based on total silver halide present, of monodispersed reflecting silver halide grains free of surface spectral sensitization and having a particle size greater than 0.40 microns and less than 0.60 micron in diameter,
- said reflecting silver halide grains free of surface spectral sensitization being intimately admixed with said silver bromoiodide grains including spectral sensitizers adsorbed on the surface thereof which reflecting grains, upon exposure, cause electromagnetic radiation to impact upon the surface of the spectrally sensitized silver bromoidodide grains.
Dependencies are inferred from the claim text.