EP0356077A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Photographic material with increased exposure latitude
Assignee: Eastman Kodak Co
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Filing: 1989-08-10
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Granted: —
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Expires: 2009-08-10
Abstract
Abstract There is described a photographic element in which increased exposure latitude is obtained by having a dye-forming coupler in a non-light-sensitive interlayer between two light-sensitive silver halide emulsion layers. One of the silver halide emulsion layers is sensitive to a first region of the spectrum and contains a dye-forming coupler that forms a dye complementary in color to the region of the spectrum to which that layer is sensitive. The second emulsion layer is sensitive to a second region of the spectrum and contains a second coupler that forms a dye complementary to the second region of the visible spectrum. The exposure latitude in the layer sensitive to the first region of the spectrum is increased when the coupler in the interlayer forms a dye complementary in color to the second region of the spectrum, but as a function of development in the first region of the spectrum.
Inventors
- 👤 Paul Timothy C/O Eastman Kodak Company Hahm
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 05:08
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3225; G03C7/3029
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
A color photographic material comprising a support, first and second silver halide emulsion layers each sensitive to a different region of the electromagnetic spectrum and each containing a coupler that forms a dye complementary in color to the principal spectral sensitivity of the emulsion, and a non-light sensitive interlayer between the two emulsion layers wherein: the interlayer contains a coupler that forms, as a function of development of the first emulsion layer, a dye complementary in color to the principal sensitivity of the second emulsion layer.
Claim 2
Dependent Claim
86 words
A color photographic material comprising a support, first and second silver halide emulsion layers each sensitive to a different region of the electromagnetic spectrum and each containing a coupler that forms a dye complementary in color to the principal spectral sensitivity of the emulsion, and a non-light sensitive interlayer between the two emulsion layers wherein: the interlayer contains a coupler that forms, as a function of development of the first emulsion layer, a dye complementary in color to the principal sensitivity of the second emulsion layer.
Claim 3
Dependent Claim
53 words
A photographic element of claim 1 wherein: the first emulsion layer is sensitive to the green region of the spectrum and contains a magenta dye-forming coupler; the second emulsion layer is sensitive to the red region of the spectrum and contains a cyan dye-forming coupler; and the interlayer contains a cyan dye-forming coupler.
Claim 4
Dependent Claim
53 words
A photographic element of claim 1 wherein: the first emulsion layer is sensitive to the red region of the spectrum and contains a cyan dye-forming coupler; the second emulsion layer is sensitive to the green region of the spectrum and contains a magenta dye-forming coupler; and the interlayer contains a magenta dye-forming coupler.
Claim 5
Dependent Claim
26 words
A photographic element of claim 2 or 3 wherein the cyan dye-forming coupler is 2-[-α-(2 4-di-tert-amylphenoxy)-butyramido]-4,6-dichloro-5-ethyl phenol and the magenta dye-forming coupler is 1-(2,4,6-trichlorophenyl)-3-[2-chloro-5-(α{4-hydroxy-3- tert-butylphenoxy} tetradecan-amido)anilino]-5-pyrazolone.
Claim 6
Dependent Claim
53 words
A photographic element of any one of claims 1-4 wherein the relative proportions of couplers is such that, upon exposure and processing, the contrast of the dye formed in the interlayer is 0.07 to 3.5, in the region where the dye formed in the first emulsion layer is within 10% of maximum density.
Claim 7
Dependent Claim
13 words
A photographic element of claim 5 wherein the contrast is 0.2 to 0.4.
Claim 8
Dependent Claim
48 words
A photographic element of any one of claims 1-4 wherein the relative proportions of couplers is such that, upon exposure and processing, the contrast of the dye formed in the interlayer is 10% to 200% of the corresponding contrast of the dye formed in the first emulsion layer.
Claim 9
Dependent Claim
25 words
A photographic element of claim 7 wherein the contrast of the interlayer is 40% to 100% of the corresponding contrast of the first emulsion layer.
Claim 10
Dependent Claim
25 words
A photographic element of any one of claims 1-4 wherein a scavenger for oxidized developing agent is between the interlayer and the second emulsion layer.
Claim 11
Dependent Claim
24 words
A photographic element of any one of claims 1-4 wherein the support is an opaque support and the element is a reflection print material.
Claim 12
Dependent Claim
117 words
A color photographic reflection print material comprising, in order: an opaque support; a blue-sensitive silver halide emulsion layer containing a yellow dye-forming coupler; a green sensitive silver halide emulsion layer containing a magenta dye-forming coupler; an interlayer; and a red-sensitive silver halide emulsion layer, containing a cyan dye-forming coupler; wherein: the interlayer contains a cyan dye-forming coupler; and the proportions of coupler and silver halide in each of the green sensitive layer, red-sensitive layer and interlayer are such that cyan dye is formed in the interlayer in response to exposure of the green-sensitive layer in an amount such that the contrast in the interlayer is from 10% to 200% of the corresponding contrast in the green-sensitive layer.
Claim 13
Dependent Claim
117 words
A color photographic reflection print material comprising, in order: an opaque support; a blue-sensitive silver halide emulsion layer containing a yellow dye-forming coupler; a green sensitive silver halide emulsion layer containing a magenta dye-forming coupler; an interlayer; and a red-sensitive silver halide emulsion layer, containing a cyan dye-forming coupler; wherein: the interlayer contains a cyan dye-forming coupler; and the proportions of coupler and silver halide in each of the green sensitive layer, red-sensitive layer and interlayer are such that cyan dye is formed in the interlayer in response to exposure of the green-sensitive layer in an amount such that the contrast in the interlayer is from 10% to 200% of the corresponding contrast in the green-sensitive layer.
References Cited (Backward Citations)
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