EP0467106B1 - Lichtempfindliche photographische Silberhalogenidmaterialien - Google Patents

Lichtempfindliche photographische Silberhalogenidmaterialien Download PDF

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Publication number
EP0467106B1
EP0467106B1 EP91110404A EP91110404A EP0467106B1 EP 0467106 B1 EP0467106 B1 EP 0467106B1 EP 91110404 A EP91110404 A EP 91110404A EP 91110404 A EP91110404 A EP 91110404A EP 0467106 B1 EP0467106 B1 EP 0467106B1
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EP
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Prior art keywords
silver halide
light
tabular
mmole
halide grains
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Expired - Lifetime
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EP91110404A
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English (en)
French (fr)
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EP0467106A1 (de
Inventor
Gerolamo Delfino
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3M Co
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Minnesota Mining and Manufacturing Co
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/16—X-ray, infrared, or ultraviolet ray processes
    • G03C5/17—X-ray, infrared, or ultraviolet ray processes using screens to intensify X-ray images
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/08—Sensitivity-increasing substances
    • G03C1/09—Noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g. for chemical sensitising
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/34—Fog-inhibitors; Stabilisers; Agents inhibiting latent image regression
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/0051—Tabular grain emulsions
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/0051—Tabular grain emulsions
    • G03C2001/0055—Aspect ratio of tabular grains in general; High aspect ratio; Intermediate aspect ratio; Low aspect ratio

Definitions

  • This invention relates to light-sensitive silver halide photographic materials and, more particularly, to light-sensitive silver halide photographic materials comprising tabular silver halide grains.
  • Tabular silver halide grains are crystals possessing two major faces that are substantially parallel in which the average diameter of said faces is at least three times (and often more times) the distance separating the faces.
  • Silver halide photographic emulsions containing a high proportion of tabular grains have advantages of good developability, improved covering power and increased useful adsorption of sensitizing dye per weight of silver due to their high surface area-to-volume ratio.
  • the use of such emulsions in photographic materials is disclosed in US Pat. Nos. 4,425,425, 4,433,048, 4,435,499, 4,439,520, and other related patents.
  • additives such as stabilizers and antifoggants
  • nitrobenzimidazoles, mercaptothiazoles, benzotriazoles, nitrobenzotriazoles, mercaptotetrazoles, etc. are described as such additives in E.J. Birr, Stabilization of Photographic Silver Halide Emulsions, Focal Press, and in US Pat. Nos. 3,954,474 and 3,982,974.
  • these additives can depress an increase of fog in a light-sensitive silver halide photographic material containing tabular grains during high temperature processing to some extent, a remarkable decrease in sensitivity cannot be prevented.
  • US Patent No. 2,728,664 describes the use of mercury compounds to retard or eliminate fog formation in silver halide photographic emulsions.
  • mercury compounds as antifoggants has not been completely satisfactory. It has been observed that mercury compounds, while acting as antifoggant and stabilizers, also reduce the photographic speed of silver halide emulsions containing such compounds. Attempts to reduce the amount of mercury compound for the purpose of lowering speed loss results in lowered antifogging action.
  • US Patent No 2,728,663 describes molecular compounds of mercuric salts with amines or salts of amines to stabilize photographic speed and mantain fog at low level when the photographic material is storaged under tropical or dry conditions at high temperatures. No increase of photographic speed with the addition of mercury compounds is reported.
  • Patent 2,084,668 describes the antifogging action of mercury compounds during the preparation of converted silver halide photographic emulsions.
  • US Patent No. 3,615,620 discloses the use of mercury oxides to suppress fog formation in silver halide photographic emulsions. However, a concomitant loss of speed is still observed.
  • US Patent No. 4,885,233 describes a combination of mercury compounds and certain benzothiazolium compounds to reduce chemical fog of silver halide photographic emulsions without adverse loss of photographic speed.
  • the combination is particularly described for use in color photographic films including dye image-forming coupler compounds and cubic silver halide grains.
  • the present invention describes a light-sensitive silver halide photographic material comprising a support and silver halide emulsion layer or layers containing a mercury compound, wherein at least one of said silver halide emulsion layers contains silver halide grains at least 40% of which being tabular silver halide grains having an average diameter:thickness ratio of at least 3:1 and a mercury compound in an amount of from 0.0001 mmole to 0.01 mmole/mole of silver.
  • the light-sensitive material of this invention can be advantageously used in high temperature processing and has increased photographic speed without serious fog problems.
  • the present invention relates to a light-sensitive silver halide photographic material comprising a support and silver halide emulsion layer or layers containing a mercury compound, wherein at least one of said silver halide emulsion layers contains silver halide grains at least 40% of which being tabular silver halide grains having an average diameter:thickness ratio of at least 3:1 and a mercury compound in an amount of from 0.0001 mmole to 0.01 mmole/mole of silver.
  • the present invention relates to a light-sensitive silver halide photographic material comprising a support and silver halide emulsion layer or layers free of latent image and containing a mercury compound, wherein at least one of said silver halide emulsion layers contains silver halide grains at least 40% of which being tabular silver halide grains having an average diameter:thickness ratio of at least 3:1 and a mercury compound in an amount of from 0.0001 mmole to 0.01 mmole/mole of silver.
  • Mercury compounds which may be used for the purposes of this invention include mercury halides, e.g. mercuric chloride, mercurous chloride, mercuric bromide, mercurous bromide, mercuric iodide and mercurous iodide, and mixed halides, e.g. mercuric bromoiodide or bromochloride, mercuric oxide, mercuric nitrate, mercurous nitrate, mercuric sulfate, mercurous sulfate, organic salts of mercury, e.g.
  • mercury halides e.g. mercuric chloride, mercurous chloride, mercuric bromide, mercurous bromide, mercuric iodide and mercurous iodide
  • mixed halides e.g. mercuric bromoiodide or bromochloride, mercuric oxide, mercuric n
  • the mercury halides are preferred.
  • the mercury compounds can be incorporated into the silver halide emulsion containing tabular silver halide grains during preparation thereof, preferably during chemical digestion, or can be added to said emulsion immediately prior to coating said emulsion onto a photographic support.
  • the mercury salts can also be incorporated into a hydrophilic colloid layer of the light-sensitive photographic material having a water-permeable relationship with the silver halide emulsion layer, preferably a layer adjacent the silver halide emulsion layer.
  • the amount of mercury compounds which is usefully employed in this invention is from about 0.0001 mmole to about 0.01 mmole/mole of silver. Preferably this amount is from about 0.0005 mmole to about 0.005 mmole/mole of silver. Within these limits, it has been surprisingly found that mercury compounds cause a speed increase with a concomitant effective fog reduction when used in light-sensitive silver halide emulsions containing tabular silver halide grains.
  • the mercury compounds for use in the present invention are preferably added to the tabular silver halide emulsion in the presence of a fog inhibiting amount of a m-dihydroxybenzene compound.
  • m-Dihydroxybenzene compounds for use in the present invention have a formula selected from the group consisting of wherein X is selected from the group consisting of a sulfo radical having the formula -SO3H, a water-soluble salt of said sulfo radical, a carboxy radical having the formula -COOH, a water-soluble salt of said carboxy radical and a hydrogen atom, and n represents 1 or 2.
  • Water-soluble salts of the m-dihydroxybenzene compounds above include alkali metal salts (e.g., sodium and potassium) and ammonium salts.
  • Illustrative m-dihydroxybenzene compounds that are used in the silver halide emulsion according to this invention include: m-dihydroxybenzene (resorcinol), 3,5-dihydroxybenzene carboxylic acid, 3,5-dihydoxybenzene sulfonic acid, 3,5-dihydoxybenzene sulfonic acid sodium salt and 1,3-dihydroxy-6,7-disulfonaphthalene potassium salt
  • the m-dihydroxybenzene compounds may be incorporated in the silver halide emulsion layer or in a layer of the light-sensitive silver halide photographic material having a water-permeable relationship with the silver halide emulsion layer.
  • the m-dihydroxybenzene compounds are incorporated in the silver halide emulsion layer containing tabular silver halide grains.
  • the amount of the subject m-dihydroxybenzene compounds that is used in the silver halide emulsion of the photographic material of this invention in combination with mercury compounds can be widely varied. Generally, about 1 to 300 millimoles of the m-dihydroxybenzene compound per mole of silver halide in the silver halide emulsion layer containing said tabular silver halide grains are utilized, although the preferred concentration range is about 5 to 100 millimoles of the m-dihydroxybenzene compound per mole of silver halide in the silver halide emulsion layer containing said tabular silver halide grains.
  • the m-dihydroxybenzene compounds used in this invention can be added to the silver halide emulsion layer containing said tabular silver halide grains utilizing any of the well-known techniques in emulsion making. For example, they can be dissolved in a suitable solvent and added to the silver halide emulsion, or they can be added to the emulsion in the form of a dispersion similar to the technique utilized to incorporate certain types of color-forming compounds (couplers) in photographic emulsions. Techniques of this type are described in US Pat. Nos. 2,322,027 and 2,801,171.
  • the solvent should be selected so that it has no harmful effect upon the emulsion in accordance with usual practice, and generally, solvents or diluents that are miscible with water are preferred.
  • the tabular silver halide grains contained in the silver halide emulsion layers of this invention have an average diameter:thickness ratio (often referred to in the art as average aspect ratio) of at least 3:1, preferably 5:1 to 30:1 and more preferably 7:1 to 15:1.
  • Average diameters of the tabular silver halide grains suitable for use in this invention range from about 0.3 to about 5 micrometeres, preferably 0.5 to 3 micrometers, more preferably 0.8 to 1.5 micrometers.
  • the tabular silver halide grains suitable for use in this invention have a thickness of less than 0.4 micrometers, preferably less than 0.3 micrometers and more preferably less than 0.2 micrometers.
  • the grain characteristics described above of the tabular silver halide grains can be readily ascertained by procedures well known to those skilled in the art.
  • the term "diameter” is defined as the diameter of a circle having an area equal to the projected area of the grain.
  • the term “thickness” means the distance between the two substantially parallel main planes constituting the tabular silver halide grains. From the measure of diameter and thickness of each grain the diameter:thickness ratio of each grain can be calculated, and the diameter:thickness ratios of all tabular grains can be averaged to obtain their average diameter:thickness ratio.
  • the average diameter:thickness ratio is the average of individual tabular grain diameter:thickness ratios. In practice it is simpler to obtain an average diameter and an average thickness of the tabular grains and to calculate the average diameter:thickness ratio as the ratio of these two averages. Whatever the used method may be, the average diameter:thickness ratios obtained do not significantly differ.
  • At least 40% of the silver halide grains are tabular grains having an average diameter:thickness ratio of at least 3:1. More preferably, at least 70% of the silver halide grains are tabular grains having an average diameter:thickness ratio of not less than 3:1.
  • Each of the above proportions, "40%” and “70%” means the proportion of the total projected area of the tabular grains having a diameter:thickness ratio of at least 3:1 to the projected area of all of the silver halide grains in the layer.
  • Other conventional silver halide grain structures such as cubic, orthorhombic, tetrahedral, etc. may make up the remainder of the grains.
  • halogen compositions of the silver halide grains can be used.
  • Typical silver halide include silver chloride, silver bromide, silver iodide, silver chloroiodide, silver bromoiodide and silver chlorobromoiodide.
  • silver bromide and silver bromoiodide are preferred silver halide compositions for tabular silver halide grains with silver bromoiodide containing 0 to 10 mol% silver iodide.
  • the halogen composition of individual grains may be homogeneous or heterogeneous.
  • Silver halide emulsions containing tabular silver halide grains can be prepared with various processes known in the conventional technology for the preparation of photographic materials.
  • Silver halide emulsions can prepared by the acid process, neutral process or ammonia process.
  • a soluble silver salt and a halogen salt can be reacted in accordance with the single jet process, double jet process, reverse mixing process or a combination process by adjusting the conditions in the grain formation, such as pH, pAg, temperature, form and scale of the reaction vessel, and the reaction method.
  • a silver halide solvent such as ammonia, thioethers and thioureas, may be used, if desired, for controlling grain size, form of the grains, particle size distribution of the grains, and the grain-growth rate.
  • hydrophilic dispersing agents for the silver halides can be employed.
  • Gelatin is preferred, although other colloidal materials such as gelatin derivatives, colloidal albumin, cellulose derivatives or synthetic hydrophilic polymers can be used as known in the art.
  • the silver halide emulsions containing tabular silver halide grains used in the present invention can be chemically and optically sensitized with methods well known in the art.
  • the silver halide emulsion layer containing the tabular silver halide grains of this invention can contain other constituents generally used in such products, such as binders, hardeners, surfactants, speed-incresing agents, plasticizers, optical sensitizers, dyes, ultraviolet absorbers, and reference can be made to, for example, Research Disclosure, Vol. 176 (December 1978), pp. 22-28.
  • Ordinary silver halide grains may be incorporated in the emulsion layer containing the tabular silver halide grains as well as in other silver halide emulsion layers of the light-sensitive silver halide photographic material of this invention. Such grains can be prepared by processes well known in the photographic art.
  • the light-sensitive silver halide photographic material of this invention can be prepared by coating the light-sensitive silver halide emulsion layer or layers and other auxiliary layers on a support.
  • a support There is no limitation with respect to the support.
  • materials suitable for the preparation of the support include glass, paper, polyethylene-coated paper, metals, cellulose nitrate, cellulose acetate, polystyrene, polyethylene terephthalate, polyethylene, polypropylene and other well known supports.
  • the light-sensitive silver halide photographic materials of this invention specifically are applicable to light-sensitive photographic color materials such as color negative films, color reversal films, color papers, etc., as well as black-and-white light-sensitive photographic materials such as X-ray light-sensitve materials, lithographic light-sensitive materials, black-and-white photographic printing papers, black-and-white negative films.
  • Preferred light-sensitive silver halide photographic materials according to this invention are X-ray light-sensitive materials comprising a silver halide emulsion layer or layers coated on one surface, preferably on both surfaces of a support, preferably a polyethylene terephthalate support, wherein at least one of said silver halide emulsion layers contains silver halide grains at least 40% of which being tabular silver halide grains having an average diameter:thickness ratio of at least 3:1 and a mercury compound in an amount of from 0.0001 mmole to 0.01 mmole/mole of silver.
  • the silver halide emulsions are coated on the support at a total silver coverage comprised in the range of 3 to 6 grams per square meter.
  • the X-ray light-sensitive materials are associated with intensifying screens so as to be exposed to radiation emitted by said screens.
  • the screens are made of relatively thick phosphor layers which transform the X-rays into light radiation (e.g., visible light).
  • the screens absorb a portion of X-rays much larger than the light-sensitive material and are used to reduce the X-ray dose necessary to obtain a useful image.
  • the phosphors can emit radiation in the blue, green or red region of the visible spectrum and the silver halide emulsions are sensitized to the wavelength region of the light emitted by the screens. Sensitization is performed by using spectral sensitizing dyes adsorbed on the surface of the silver halide grains as known in the art.
  • More preferred light-sensitive silver halide photographic materials according to this invention are X-ray light-sensitive materials which employ one or more high diameter:thickness ratio tabular grain silver halide emulsions or intermediate diameter:thickness ratio tabular grain silver halide emulsions, as disclosed in US Pat. Nos. 4,425,425 and 4,425,426 and in EP Pat. Appln. 84,637.
  • the exposed light-sensitive materials of this invention can be processed by any of the conventional processing techniques.
  • the processing can be a black-and-white photographic processing for forming a silver image or a color photographic processing for forming a dye image depending upon the purpose.
  • Such processing techniques are illustrated for example in Research Disclosure, 17643, December 1978.
  • Roller transport processing in an automatic processor is particularly preferred, as illustrated in US Pat. Nos. 3,025 779, 3,515,556, 3,545,971 and 3,647,459 and in GB-A-1,269,268.
  • Hardening development can be undertaken, as illustrated in US Pat. No. 3,232,761.
  • the present invention remarkably reduces fog formation, with concurrent increase of photographic speed, by adding a mercury compound to a silver halide emulsion layer containing tabular silver halide grains.
  • This invention in particular, is effective for high temperature, accelerated processing with a roller transport automatic processor in a developing solution containing an aldehyde type hardener.
  • a tabular grain silver bromide emulsion (having an average grain diameter of 1.43 ⁇ m and an average diameter: thickness ratio of 8.0:1) was divided into three portions and each portion was optically sensitized to green light with a cyanine dye and chemically sensitized with sodium thiosulfate and gold thiocyanate complex at a different digestion time (emulsion Al digested for 130 min, A2 digested for 140 min and A3 digested for 150 min). Each emulsion, containing a wetting agent and 5-methyl-7-hydroxytriazaindolizine stabilizer, was added with 3 g/mole silver of resorcinol and with a bis-vinylsulfonylethylether hardener.
  • Each emulsion was coated on a side of a blue polyester film support at a silver coverage of 4 g/m.
  • the tabular grain silver bromide emulsion of example 1 was optically sensitized to green light with a cyanine dye and chemically sensitized with sodium thiosulfate and gold thiocyanate complex at a digestion time of 135 min.
  • the emulsion was coated on a side of a blue polyester film support at a silver coverage of 4 g/m.
  • An inert gelatin protective supercoat containing 1.5 g/m of gelatin and dimethylolurea and resorcinaldehyde hardeners was applied on the coating (film A).
  • a sample of a tabular silver halide emulsion prepared as above was digested for 135 min in the presence of 0.79 x 10 ⁇ 3 mmole/mole of silver of HgCl2.
  • the emulsion, containing the same additions as above, was coated as above (film B).
  • a sample of a tabular silver halide emulsion prepared as above was digested for 145 min in the presence of 1.19 x 10 ⁇ mmole/mole of silver of HgCl2.
  • the emulsion, containing the same additions as above, was coated as above (film C).

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
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Claims (10)

  1. Lichtempfindliches photographisches Silberhalogenidmaterial, umfassend einen Träger und (eine) Silberhalogenidemulsionsschicht oder -schichten, die eine Quecksilberverbindung enthält (enthalten), dadurch gekennzeichnet, daß mindestens eine der Silberhalogenidemulsionsschichten Silberhalogenidkörner, von denen mindestens 40% tafelförmige Silberhalogenidkörner mit einem durchschnittlichen Verhältnis Durchmesser:Dicke von mindestens 3:1 sind und eine Quecksilberverbindung in einer Menge von 0,0001 mMol bis 0,01 mMol/Mol Silber enthält.
  2. Lichtempfindliches photographisches Silberhalogenidmaterial nach Anspruch 1, in dem die Quecksilberverbindung ein Quecksilber(II)- oder Quecksilber(I)-halogenid ist.
  3. Lichtempfindliches photographisches Silberhalogenidmaterial nach Anspruch 1, wobei die Quecksilberverbindung mit einer m-Dihydroxybenzolverbindung kombiniert ist, die in einer Menge von etwa 1 bis etwa 300 mMol pro Mol Silherhalogenid in der Silberhalogenidemulsionsschicht vorhanden ist, die die tafelförmigen Silberhalogenidkörner enthält.
  4. Lichtempfindliches photographisches Silberhalogenidmaterial nach Anspruch 3, wobei die m-Dihydroxybenzolverbindung eine Formel, ausgewählt aus
    Figure imgb0005
     aufweist, wobei X aus einem Sulforest der Formel -SO₃H, einem in Wasser löslichen Salz des Sulforestes, einem Carboxyrest der Formel COOH, einem in Wasser löslichen Salz des Carboxyrestes und einem Wasserstoffatom ausgewählt ist, und n 1 oder 2 bedeutet.
  5. Lichtempfindliches photographisches Silberhalogenidmaterial nach Anspruch 1, wobei die tafelförmigen Silberhalogenidkörner ein durchschnittliches Verhältnis Durchmesser:Dicke von 5:1 bis 30:1 besitzen.
  6. Lichtempfindliches photographisches Silberhalogenidmaterial nach Anspruch 1, wobei die tafelförmigen Silberhalogenidkörner einen durchschnittlichen Durchmesser im Bereich von etwa 0,3 bis 5 Mikrometer besitzen.
  7. Lichtempfindliches photographisches Silberhalogenidmaterial nach Anspruch 1, wobei die tafelförmigen Silberhalogenidkörner eine durchschnittliche Dicke von 0,4 Mikrometer oder kleiner besitzen.
  8. Lichtempfindliches Silberhalogenidmaterial zur Verwendung in der Radiographie mit verstärkenden Schirmen, umfassend einen transparenten Träger, der auf beiden Seiten mit Silberhalogenidemulsionsschichten beschichtet ist, die eine Quecksilberverbindung enthalten, dadurch gekennzeichnet, daß mindestens eine der Silberhalogenidemulsionsschichten Silberhalogenidkörner, von denen mindestens 40% tafelförmige Silberhalogenidkörner mit einem durchschnittlichen Verhältnis Durchmesser:Dicke von mindestens 3:1 sind und eine Quecksilberverbindung in einer Menge von 0,0001 mMol bis 0,01 mMol/Mol Silber enthält.
  9. Lichtempfindliches photographisches Silberhalogenidmaterial, umfassend einen Träger und (eine) Silberhalogenidemulsionsschicht oder -schichten, die frei von einem latenten Bild ist (sind) und eine Quecksilberverbindung enthält (enthalten), dadurch gekennzeichnet, daß mindestens eine der Silberhalogenidemulsionsschichten Silberhalogenidkörner, von denen mindestens 40% tafelförmige Silberhalogenidkörner mit einem durchschnittlichen Verhältnis Durchmesser:Dicke von mindestens 3:1 sind und eine Quecksilberverbindung in einer Menge von 0,0001 mMol bis 0,01 mMol/Mol Silber enthält.
  10. Verwendung einer Quecksilberverbindung in einer Menge von 0,0001 mMol bis 0,01 mMol/Mol Silber zur Erhöhung der photographischen Empfindlichkeit eines lichtempfindlichen photographischen Silberhalogenidmaterials, umfassend einen Träger und mindestens eine Silberhalogenidemulsionsschicht, die Silberhalogenidkörner enthält, von denen mindestens 40% tafelförmige Silberhalogenidkörner mit einem durchschnittlichen Verhältnis Durchmesser:Dicke von mindestens 3:1 sind.
EP91110404A 1990-07-20 1991-06-24 Lichtempfindliche photographische Silberhalogenidmaterialien Expired - Lifetime EP0467106B1 (de)

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IT02099890A IT1246184B (it) 1990-07-20 1990-07-20 Materiale fotografico agli alogenuri d'argento sensibili alla luce.
IT2099890 1990-07-20

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US5856061A (en) * 1997-08-14 1999-01-05 Minnesota Mining And Manufacturing Company Production of color proofs and printing plates

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US4425426A (en) * 1982-09-30 1984-01-10 Eastman Kodak Company Radiographic elements exhibiting reduced crossover
US4885233A (en) * 1988-07-28 1989-12-05 Eastman Kodak Company Mercury and benzothiazolium salt stabilization of a photographic recording material
IT1236562B (it) * 1989-10-31 1993-03-11 Minnesota Mining & Mfg Materiale fotografico agli alogenuri d'argento sensibile alla luce.

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EP0467106A1 (de) 1992-01-22
IT9020998A0 (it) 1990-07-20
IT1246184B (it) 1994-11-16
DE69119834T2 (de) 1996-10-02
IT9020998A1 (it) 1992-01-20

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