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US 4,902,609 AGranted
Photographic print material with increased exposure latitude
AssigneeEastman Kodak Company
InventorPaul T. Hahm
Life of this patent
Estimating the term…
Abstract
A multilayer color positive photographic print material with extended exposure latitude contains a limited amount of a spectral sensitizing dye for a first region of the spectrum in a silver halide emulsion layer spectrally sensitized to a second region of the spectrum.
Claims7
A photographic print material for forming a positive multicolor dye image comprised of
- a paper support,
- a blue-sensitive, yellow-dye-image-forming silver halide emulsion layer,
- a green-sensitized, magenta-dye-image-forming silver halide emulsion layer, and
- a red-sensitized, cyan-dye-image-forming silver halide emulsion layer,
- wherein the green-sensitized emulsion layer contains the red-sensitizing dye anhydro-3-ethyl-9,11-neopentylene-3'-(3-sulfopropyl)-thiadicarbocyanin e hydroxide in an amount of from 5 to 15% by weight of the amount of red-sensitizing dye contained in the red-sensitized emulsion layer.
2 more elements
A photographic print material for forming a positive multicolor dye image comprised of
- a paper support,
- a blue-sensitive, yellow-dye-image-forming silver halide emulsion layer,
- a green-sensitized, magenta-dye-image-forming silver halide emulsion layer, and
- a red-sensitized, cyan-dye-image-forming silver halide emulsion layer,
- wherein the red sensitized emulsion layer contains the green sensitizing anhydro-5-chloro-9-ethyl-5'-phenyl-3'-(3-sulfobutyl)-3-(3-sulfopropyl)-oxa carbocyanine hydroxide, sodium salt in an amount from 5 to 15% by weight of the amount of green sensitizing dye contained in the green sensitized emulsion layer.
2 more elements
A photographic print material for forming a positive multicolor dye image comprised of
- a paper support,
- a yellow-dye-image-forming silver halide emulsion layer having its principal sensitivity in the blue region of the spectrum,
- a magenta dye-image-forming silver halide emulsion layer having its principal sensitivity in the green region of the spectrum, and
- a cyan dye-image-forming silver halide emulsion layer having its principal sensitivity in the red region of the spectrum.
- wherein
- (a) at least one of the magenta and cyan dye-forming emulsion layers contains an amount of the spectral sensitizing dye employed to provide principal sensitivity to the other of the magenta and cyan dye-forming emulsion layers sufficient to provide that layer with a secondary sensitivity to the region of the spectrum to which the other of the layer has its principal sensitivity.
- (b) there is a speed separation between the two said emulsion layers in that common region of sensitivity of between about 0.85 and 1.30 log E, and
- (c) the dye that provides principal and secondary sensitivity to the green region of the spectrum is anhydro-5-chloro-9-ethyl-5'-phenyl-3'-(3-sulfobutyl)-3-(sulfopropyl)-oxaca rbocyanine hydroxide, sodium salt and the dye that provides principal and secondary sensitivity to the red region of the spectrum is anhydro-3-ethyl-9,11-neopentylene-3'-(3-sulfopropyl)-thiadicarbocyanine hydroxide.
5 more elements
Dependencies are inferred from the claim text.