EP0278510A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Silver halide photographic materials spectrally sensitized with luminous dye
Assignee: Fujifilm Holdings Corp
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Filing: 1988-02-11
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Granted: —
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Expires: 2008-02-11
Abstract
Abstract A silver halide photographic material is disclosed containing at least one silver halide emulsion layer, in which (1) the silver halide grains constituting the emulsion layer have been spectrally sensitized by at least one adsorbable spectral sensitizing dye added thereto before the completion of chemical ripening of the grains, and (2) at least one luminous dye which has a quantum efficiency of 0.1 or more when the concentration thereof in dry gelatin at room temperature is 10⁻⁴ mol/dm³ and which can be substantially completely removed by development is added to a hydrophilic dispersion medium for the emulsion layer exclusive of the silver halide grains in a concentration of 2.0 mmol/dm³ in the dispersion medium. The addition of the spectral sensitizing dye is not limitative and can be either before the completion of the formation of the silver halide grains or during a stage from the completion of the formation of the grains to the completion of the chemical ripening thereof. By the combination of the spectral sensitization by the adsorbable spectral sensitizing dye and light-collecting sensitization by the luminous dye, the spectral sensitivity of the silver halide in the material is unexpectedly improved.
Inventors
- 👤 Tsutomu Fuji Photo Film Co. Ltd. Miyasaka
- 👤 Tadaaki Fuji Photo Film Co. Ltd. Tani
- 👤 Tadao Fuji Photo Film Co. Ltd. Sugimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 14:14
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/015
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
116 words
A silver halide photographic material containing at least one silver halide emulsion layer, in which (1) the silver halide grains constituting the emulsion layer have been spectrally sensitized with at least one adsorbable spectral sensitizing dye as added thereto before the completion of chemical ripening of the grains, and (2) at least one luminous dye which has a quantum efficiency of 0.1 to 1.0 when the concentration thereof in dry gelatin at room temperature is 10⁻⁴ mol/dm³ and which can be substantially completely removed by development process is added to a hydrophilic dispersion medium of the silver halide emulsion layer exclusive of the silver halide grains in a concentration of 2.0 mmol/dm³ in the dispersion medium.
Claim 2
Dependent Claim
116 words
A silver halide photographic material containing at least one silver halide emulsion layer, in which (1) the silver halide grains constituting the emulsion layer have been spectrally sensitized with at least one adsorbable spectral sensitizing dye as added thereto before the completion of chemical ripening of the grains, and (2) at least one luminous dye which has a quantum efficiency of 0.1 to 1.0 when the concentration thereof in dry gelatin at room temperature is 10⁻⁴ mol/dm³ and which can be substantially completely removed by development process is added to a hydrophilic dispersion medium of the silver halide emulsion layer exclusive of the silver halide grains in a concentration of 2.0 mmol/dm³ in the dispersion medium.
Claim 3
Dependent Claim
115 words
A silver halide photographic material containing at least one silver halide emulsion layer, in which (1) the silver halide grains constituting the emulsion layer have been spectrally sensitized by at least one adsorbable spectral sensitizing dye added thereto before the completion of the formation of said grains, and (2) at least one luminous dye which has a quantum efficiency of 0.1 to 1.0 when the concentration thereof in a dry gelatin at room temperature is 10⁻⁴ mol/dm³ and which can be substantially completely removed by development is added to a hydrophilic dispersion medium of the silver halide emulsion layer exclusive of the silver halide grains in a concentration of 2.0 mmol/dm³ in the dispersion medium.
Claim 4
Dependent Claim
115 words
A silver halide photographic material containing at least one silver halide emulsion layer, in which (1) the silver halide grains constituting the emulsion layer have been spectrally sensitized by at least one adsorbable spectral sensitizing dye added thereto before the completion of the formation of said grains, and (2) at least one luminous dye which has a quantum efficiency of 0.1 to 1.0 when the concentration thereof in a dry gelatin at room temperature is 10⁻⁴ mol/dm³ and which can be substantially completely removed by development is added to a hydrophilic dispersion medium of the silver halide emulsion layer exclusive of the silver halide grains in a concentration of 2.0 mmol/dm³ in the dispersion medium.
Claim 5
Dependent Claim
125 words
A silver halide photographic material containing at least one silver halide emulsion layer, in which (1) the silver halide grains constituting the emulsion layer have been spectrally sensitized by at least one adsorbable spectral sensitizing dye added thereto during the stage from the completion of the formation of the grains to the completion of the chemical ripening thereof, and (2) at least one luminous dye which has a quantum efficiency of 0.1 to 1.0 when the concentration thereof in dry gelatin at room temperature is 10⁻⁴ mol/dm³ and which can be substantially completely removed by development is added to a hydrophilic dispersion medium of the silver halide emulsion layer exclusive of the silver halide grains in a concentration of 2.0 mmol/dm³ in the dispersion medium.
Claim 6
Dependent Claim
125 words
A silver halide photographic material containing at least one silver halide emulsion layer, in which (1) the silver halide grains constituting the emulsion layer have been spectrally sensitized by at least one adsorbable spectral sensitizing dye added thereto during the stage from the completion of the formation of the grains to the completion of the chemical ripening thereof, and (2) at least one luminous dye which has a quantum efficiency of 0.1 to 1.0 when the concentration thereof in dry gelatin at room temperature is 10⁻⁴ mol/dm³ and which can be substantially completely removed by development is added to a hydrophilic dispersion medium of the silver halide emulsion layer exclusive of the silver halide grains in a concentration of 2.0 mmol/dm³ in the dispersion medium.
Claim 7
Dependent Claim
84 words
A silver halide photographic material as in any one of claims 1 to 3, in which the luminous dye in the dispersion medium is substantially non-adsorbable and the adsorbability of the dye to the silver halide grains is 5 × 10⁻⁷ mol/m² or less in an aqueous 5% (by weight) gelatin solution of silver bromide grains having (111) crystal plane at a temperature of 40°C and a pH value of 6.5 ± 0.05 and a dye concentration of 10⁻⁴ mol/liter of said solution phase.
Claim 8
Dependent Claim
40 words
A silver halide photographic material as in any one of claims 1 to 3, in which the luminous dye has a quantum efficiency of 0.3 to 1.0 when the concentration thereof in dry gelatin at room temperature is 10⁻⁴ mol/dm³.
Claim 9
Dependent Claim
22 words
A silver halide photographic material as in claim 5, in which the quantum efficiency of the luminous dye is 0.5 to 1.0.
Claim 10
Dependent Claim
48 words
A silver halide photographic material as in any one of claims 1 to 3, in which the content of the luminous dye is 10 mmol/dm³ or more in the hydrophilic dispersion medium of the said silver halide emulsion layer exclusive of the surfaces of the silver halide grains.
Claim 11
Dependent Claim
48 words
A silver halide photographic material as in any one of claims 1 to 3, in which the luminous dye contained in the dispersion medium of the emulsion layer is water-soluble and the solubility of the dye in water is 10⁻² mol/liter or more at 25°C and pH 7.0.
Claim 12
Dependent Claim
24 words
A silver halide photographic material as in any one of claims 1 to 3, in which the luminous dye is a water-soluble cyanine dye.
Claim 13
Dependent Claim
49 words
A silver halide photographic material as in any one of claims 1 to 3, in which at least one luminous dye has an emission zone which overlaps with at least a part of the absorption zone of the dye directly adsorbed onto the surfaces of the silver halide grains.
Claim 14
Dependent Claim
59 words
A silver halide photographic material as in any one of claims 1 to 3, in which the luminous dye generates an emission with a Stokes' shift (difference in the wavelength between the absorption peak and the emission peak) of 0 to 40 nm when the concentration of the dye in a dry gelatin at room temperature is 10⁻⁴ mol/dm³.
Claim 15
Dependent Claim
26 words
A silver halide photographic material as in claim 11, in which the Stokes' shift in the emission by the luminous dye is 0 to 20 nm.
Claim 16
Dependent Claim
47 words
A silver halide photographic material as in any one of claims 1 to 3, in which the luminous dye has a reduction potential in a solution of water/methanol (= 1/1, by volume) which is more anodic than -1.0 V with respect to a saturated calomel reference electrode.
Claim 17
Dependent Claim
60 words
A silver halide photographic material as in claim 2, in which the photographic spectral sensitizing dye(s) is(are) added during the stage of the formation of the silver halide grains, which stage is after the formation of stable nuclei of the silver halide grains but before the completion of the addition of 85% by weight of the total silver halide amount.
Claim 18
Dependent Claim
61 words
A silver halide photographic material as in claim 2, in which the photographic spectral sensitizing dye(s) is(are) added during the stage of the formation of the silver halide grains, which stage is after the completion of the addition of 85% by weight of the total silver halide amount but before the completion of the addition of the total silver halide amount.
Claim 19
Dependent Claim
53 words
A silver halide photographic material as in claim 2, in which the photographic spectral sensitizing dye(s) is(are) added during the stage of the formation of the silver halide grains, which stage is after the completion of the addition of the silver halide but before the beginning of desalting of the silver halide grains.
References Cited (Backward Citations)
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