EP0678772A1
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EP
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Light-sensitive material comprising silver chlorobromoiodide or chloroiodide tabular grains
Assignee: Agfa Gevaert NV
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Filing: 1995-03-17
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Granted: —
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Expires: 2015-03-17
Abstract
Abstract Emulsions are disclosed, comprising tabular silver chlorobromoiodide or silver chloroiodide tabular grains having (111) crystal faces, at least 75 mole % of chloride and up to 3 mole % of iodide, an average aspect ratio of at least 8:1, an average grain thickness of from 0.08 µm to less than 0.2 µm and wherein at least 50 % of the total projected area of all the grains is provided by said tabular grains. Said emulsions are very suitable for use in the light-sensitive layer(s) of a high sensitive photographic material comprising a support and on at least one side thereof at least one silver halide light-sensitive emulsion layer comprising said emulsions. Processing of such a photographic material is even possible in a total processing time of up to 38 seconds with low regeneration amounts in hardener-free processing solutions, without showing dye stain and with a suitable black image tone.
Inventors
- 👤 Ann C/O Agfa-Gevaert N.V. Verbeeck
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 16:33
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/0051; G03C1/0053; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/14; G03C1/18; G03C1/46; G03C2001/0055; G03C5/00; G03C5/16; G03C2005/168; G03C2200/00; G03C2200/03
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
73 words
Emulsion comprising silver chlorobromoiodide or silver chloroiodide tabular grains having (111) crystal faces, having at least 75 mole % of chloride and up to 3 mole % of iodide, having an average aspect ratio of at least 8:1 and an average grain thickness of from 0.08 µm to less than 0.2 µm and wherein at least 50 % of the total projected area of all the grains is provided by said tabular grains.
Claim 2
Dependent Claim
25 words
Emulsion according to claim 1, wherein at least 70 % of the total projected area of all the grains is provided by said tabular grains.
Claim 3
Dependent Claim
18 words
Emulsion according to claim 1 or 2 wherein tabular grains have at most 1 mole % of iodide.
Claim 4
Dependent Claim
22 words
Emulsion according to any of claims 1 to 3, wherein the tabular grains have an average aspect ratio of at most 50:1.
Claim 5
Dependent Claim
30 words
Emulsion according to any of claims 1 to 4, wherein an amount of adenin of at most 0.3 mg per g of the equivalent amount of silver nitrate is present.
Claim 6
Dependent Claim
20 words
Emulsion according to any of claims 1 to 5, wherein said tabular grains have iodide ions at the crystal surface.
Claim 7
Dependent Claim
27 words
Emulsion according to any of claims 1 to 6, wherein said tabular grains have been spectrally sensitised with at least one spectral sensitizer having a J-aggregating structure.
Claim 8
Dependent Claim
133 words
Emulsion according to claim 7, wherein the said spectral sensitiser has a structure corresponding to the general formula (I) wherein Z represents a nitrogen or an oxygen atom and is substituted with R'' if Z is a nitrogen atom, R, R' and R'' each independently represent substituted or unsubstituted alkyl, R''' represents hydrogen, substituted or unsubstituted alkyl or substituted or unsubstituted aryl, T and T' each independently represent the usual substituents known in the art, (X⁻) p represents an negatively charged atom or group of atoms to compensate for the positive charge(s) present on the dye, and (M⁺) q represents a positively charged atom or group of atoms to compensate for the negative charge(s) present on the dye, wherein p and q each an integer in order to get an electronically neutral compound.
Claim 9
Dependent Claim
18 words
Emulsion according to claim 7 or 8, wherein the said spectral sensitizer is anhydro-5,5'-dichloro-3,3'-bis(n-sulphobutyl)-9-ethyloxacarbo-cyanine hydroxide or anhydro-5,5'-dichloro-3,3'-bis(n-sulphopropyl)-9-ethyloxacarbo-cyanine hydroxide.
Claim 10
Dependent Claim
15 words
Emulsion according to claim 9 wherein said spectral sensitizer is applied in combination with anhydro-5,5'-dicyano-3,3'-bis(N-acetoxyethyl)-1,1'-ethylbenzimidazolcarbocyanine.
Claim 11
Dependent Claim
31 words
Photographic material comprising a support and on at least one side thereof at least one silver halide light-sensitive emulsion layer from an emulsion according to any of claims 1 to 10.
Claim 12
Dependent Claim
24 words
Photographic material according to claim 11 wherein the material has an amount of water absorption of at most 10 g/m² at the emulsion side.
Claim 13
Dependent Claim
17 words
Photographic material according to claim 11 or 12 wherein the said material is an X-ray photographic material.
Claim 14
Dependent Claim
31 words
Photographic material according to claim 13 wherein said photographic material is a double side coated material with a cross-over percentage of less than 40% in the absence of an antihalation undercoating.
References Cited (Backward Citations)
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