EP0104351B1 - Photographisches Gelatinsilber Aufzeichnungsmaterial für gerbende Entwicklung - Google Patents

Photographisches Gelatinsilber Aufzeichnungsmaterial für gerbende Entwicklung Download PDF

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Publication number
EP0104351B1
EP0104351B1 EP83107210A EP83107210A EP0104351B1 EP 0104351 B1 EP0104351 B1 EP 0104351B1 EP 83107210 A EP83107210 A EP 83107210A EP 83107210 A EP83107210 A EP 83107210A EP 0104351 B1 EP0104351 B1 EP 0104351B1
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EP
European Patent Office
Prior art keywords
silver halide
photographic element
element according
gelatin
silver
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83107210A
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English (en)
French (fr)
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EP0104351A1 (de
Inventor
Antonio Luzzi
Marco Beruto
Piero Ramello
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3M Co
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Minnesota Mining and Manufacturing Co
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Publication date
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Publication of EP0104351A1 publication Critical patent/EP0104351A1/de
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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
    • 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
    • G03C1/42—Developers or their precursors
    • 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
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/29—Development processes or agents therefor
    • G03C5/315—Tanning development

Definitions

  • the present invention refers to photographic elements for tanning development suitable for obtaining colored relief colloidal images upon short exposure to high-intensity light.
  • photographic elements which contain unhardened gelatin layers containing silver halide emulsions can be made image-wise insoluble upon exposure to a light source and processing in the presence of tanning developers.
  • the oxidation products of the tanning developer formed during development of the exposed regions of the image, are capable of producing image-wise hardened gelatin.
  • the unexposed regions of the image, being unhardened, can be washed away with warm water or can be totally or partially transferred onto an image-receiving material.
  • Photographic elements for tanning development are described in US patents 3,364,024, 3,300,307, 3,240,599 and GB patent application 2,020,834, US patent 3,300,307 describes the combination of gentisic acid with 3-pyrazolidone compounds associated with conventional low sensitivity emulsions for use with conventional (long) exposures.
  • US patent 3,240,599 and GB patent application 2,020,834 refer to low sensitivity emulsions, coated at conventionally high silver coverage, for use with conventional (long) exposures, associated with tanning developers and non tanning developers such as p-phenylenediamine, phenidone, methol and 4-methoxy-1-naphthol (a self-coupling developer).
  • They normally consist of a base having coated thereon a gelatin silver halide emulsion layer and having an unsensitive unhardened gelatin pigmented layer in adjacent position thereto.
  • a tanning developer of the hydroquinone type Upon development of the exposed layer in the presence of a tanning developer of the hydroquinone type, the oxidation products of the hydroquinone harden the exposed regions of the sensitive layer and the adjacent ones of the pigmented layer.
  • Improved photographic elements for tanning development are described in IT-B-1144001 (corresponding with US-A-4369245). These elements have at least one unhardened gelatin layer associated with a light sensitive silver halide emulsion, a colored pigment and a tanning developer, said silver halide emulsion haivng silver in quantity of less than 0.6 g/m 2 and a silver to gelatin weight ratio lower than 0.4.
  • the photographic elements for tanning development are generally useful in graphic art applications for the reproduction of originals wherein an image is formed by dots or lines with a process which is cheaper and quicker than the processes which make use of conventional photographic elements.
  • the photographic elements are exposed to normal light sources, such as quarz and tungsten lamps. For relatively long times ranging generally from 5 to 10 seconds, thus obtaining after development a tanned gelatin relief image.
  • These elements cannot be used to form an image in applications such as "phototypesetting" (for type printing), which require short exposures to high intensity light (short herein meaning no more than about 10 microseconds).
  • a photographic element for tanning development to be used with short exposures to high-intensity light can be obtained if a high-sensitivity emulsion is associated with a compound of the 3-pyrazolidinone type and then coated with gelatin with a low silver coverage and a low silver/gelatin ratio.
  • 3-pyrazolidinone compounds do not improve the conventional elements to be used in graphic art applications, while they give very good results when associated with high-sensitivity emulsions to be used in conventional photography, when such emulsions are processed in an alkaline activating bath after short exposure to high-intensity light.
  • the emulsion is coated with low silver coverages and low silver/gelatin ratio. It is also important that such emulsions are highly sensitive and have sufficiently coarse grains.
  • High-sensitivity emulsions herein means a (chemically digested and ripened) emulsion which, associated with a magenta coupler like 1-(2,4,6-trichlorophenyl)-3-[3-(2,4-ditert.amylphenoxyacetamido)-benzamidol-5-pyrazolone and with a sensitizer (e.g. anhydrous 5-chloro-5'-phenyl-3,3'-di-(3-sulfopropyl)-oxacarbocyanine hydroxide), gives a sensitivity of at least 20 ASA when exposed to white light through a step wedge and then developed with a p-phenylene diamine developer (e.g. 4-amino-3-methyl-N-ethyl-N-( ⁇ 3-hydroxyethyl)-aniline sulfate).
  • a magenta coupler like 1-(2,4,6-trichlorophenyl)-3-[3-(
  • Such emulsions are of the type normally used in traditional color photography, for example in the elements for color prints.
  • 1-phenyl-3-pyrazolidinone compounds in the same conditions (phototypesetting exposure and tanning development), emulsions known in the art of photographic elements for tanning development do not give rise to image formation.
  • Other auxiliary developers, normally equivalent thereto, such as methol did not prove to be effective as 1-phenyl-3-pyrazolidinone.
  • Examples of such derivatives are 1-phenyl-4,4-dimethyl-, 1-phenyl-5-methyl-, 1-chlorophenyl-, 1-phenyl-5,5-dimethyl-, 1,5-diphenyl-, 1-phenyl-4-ethyl-, 1-phenyl-4,4-dihydroxymethyl-, 1-p-tolyl-4,4-dihydroxymethyl- and 1-phenyl-4-hydroxy-methyl-4-methyl-3-pyrazolidinone compounds.
  • Such emulsions are characterized by a high iodide content (i.e. greater than 2.5 or 3% mole ratio) and by relatively large grain size.
  • iodide percentage is at least 4%, more preferably is comprised between 4 and 20% and most preferably between 5 and 15%.
  • Bromide is the main component and is preferably present in a quantity of at least 65%, more preferably of at least 75%. Chloride can be either present or not. It is preferred that the presence thereof be limited at a maximum of 30%, more preferably of 15% and most preferably of 7%.
  • the grain sizes appear also to be significantto the purposes of the present invention. It is preferred that the grains have means sizes of at least 0.30 pm. It is more preferred that the distribution curve thereof shows at least 30%, more preferably 50% and most preferably 70% of the grains with a diameter higher than 0.30 ⁇ .1m. It is surprising that such coarse grain and high-iodide content emulsions, per se having low developability characteristics, could be developed within short times, as required by the above described conditions.
  • the emulsion is coated with a silver coverage lower than 0.6 g/m 2 , preferably lower than 0.5 g/m 2 , more preferably lower than 0.4 g/m 2 . It is also deemed essential that the silver/gelatin weight ratio be lower than 0.4, preferably lower than 0.3 and more preferably lower than 0.2. It is preferred that the gelatin/tanning developer weight ratio be comprised between 3 and 25, more preferably between 5 and 20 and most preferably between 6 and 18.
  • catechol as tanning agent, shows a particularly desirable behavior.
  • the present invention refers to a photographic element for tanning development to be used with short exposures to high-intensity light having at least one substantially unhardened gelatin layer associated with a light-sensitive silver halide emulsion, a colored pigment and a tanning developer, said silver halide emulsion having silver in quantity of less than 0.6 g/m 2 and a silver to gelatin weight ratio lower than 0.4, characterized by the fact that said silver halide emulsion has a sensitivity of at least 20 ASA,-when associated with a sensitizer and a magenta 5-pyrazolone coupler, exposed to light through a step wedge and developed with a p-phenylene diamine developer-, and is associated with a 3-pyrazolidinone compound.
  • the present invention particularly refers to a photographic element as per above including emulsions which, associated with a coupler and a sensitizer as described, give a sensitivity in a standard color negative processing of at least 20 ASA, when processed in a C41 type process (see Photo Lab Index, Lifetime, Ed, Morgan and Morgan Publishers).
  • the present invention in particular refers to the above described elements which contain emulsions having a silver iodide mole percentage of at least 4, more preferably comprised between 4 and 20 and most preferably between 5 and 15.
  • the present invention in particular refers to a photographic element as described above, wherein the silver halide emulsions have a mean grain size of at least 0.30 ⁇ m.
  • the present invention refers to emulsions in which 30%, preferably 50% and more preferably 70% of the silver halide grains has a diameter higher than 0.30 Ilm.
  • the present invention refers to a photographic element as described above, wherein the tanning developer is a hydroquinone tanning developer.
  • the present invention refers to a photographic element as described above, wherein the tanning developer is pyrocatechol. More in particular, the present invention refers to a photographic element as described above, wherein a single substantially unhardened gelatin layer includes the silver halide emulsion, the photographically inert water insoluble colored pigment, the tanning developer and the 3-pyrazolidinone compound.
  • the present invention refers to a photographic element as described above which comprises a base having coated thereon two superimposed substantially unhardened gelatin layers, one of which includes the silver halide emulsion and the tanning developer and the other the photographically inert waterinsoluble colored pigment and the 3-pyrazolidinone compound.
  • the present invention refers to a photographic element as described above, wherein the quantity of the 2.pyrazolidinone compound is in the range of 0.005 to 0.15 g/m 2 meter, more preferably of 0.01 to 0.1 g/m 2 and most preferably of 0.02 to 0.06 g/m 2 .
  • the conditions under which the elements of the present invention give surprising results are those based on an exposure to a 800 to 1200 volt flash for times ranging from 3 to 8 microseconds and then processing in an activating alkaline water bath.
  • This normally includes an alkalizing agent (such as alkaline phosphates or carbonates, alkaline hydroxides, e.g. Na 2 C0 3 at concentrations ranging from 0.4 to 15% by weight, preferably from to 0.8 to 6% by weight and more preferably from 1 to 4% by weight) and, preferably, an agent retarding gelatin swelling (e.g. Na 2 S0 4 at concentrations between 6 and 26% by weight, preferably between 10 and 20% and more preferably between 12 and 16% by weight).
  • the activation normally takes place at temperatures ranging from 28 to 38°C, preferably from 30 to 36°C and more preferably from 32 to 34°C, in a time less than 60 seconds, preferably less than 40 seconds and more preferably less than 30 seconds.
  • the present invention refers to a process for the formation of a relief image with photographic elements for tanning development which consists of a short exposure thereof to high-intensity light and of a development under the above described conditions, characterized in that the exposure is performed with the above described emulsions and the development is carried out in the presence of a 3-pyrazolidinone compound associated therewith in said photographic elements.
  • Emulsions particularly effective to the purposes of the present invention are those normally used in conventional color photography, for instance bromo-iodide emulsions for color print negative photographic materials, such as for instance 3M Color Print ASA 100. Bromo-iodide emulsions used in radiography could also be used. In the choice, it is necessary to pay attention to the grain sizes, as already described. Of course, excessive grain sizes lead to quality decrease as regards definition and graininess. It is preferred that no more than 15% of the grains have sizes higher than 1 or 2 pm. The highest grain sizes of the emulsions of the present invention, anyhow, depend on the specific application of the invention itself and any man skilled in the art can find them with experiments depending upon his specific needs.
  • the emulsion type used is preferably a silver bromo-iodide or silver chloro-bromo-iodide emulsion as described hereinbefore, chemically and/or optically sensitized as known in the art.
  • the photographic elements for tanning development of the present invention comprise substantially unhardened gelatin, wherein substantially unhardened gelatin means gelatin which is not harder than that containing 0.3 grams of anhydrous formaline per each kilogram of fresh-coated gelatin as described in US patent 3,364,024.
  • the base is one of the various bases known and used in photography, such as paper, resin-coated paper, cellulose triacetate and polyester bases.
  • Any dye material or pigment used in photography which does not diffuse into the gelatin layer and is not reactive with the photographic emulsion to give negative phenomena such as fog or desensitization, can be used in the practice of the present invention.
  • Carbon black, colloidal silver, organic and inorganic pigments are examples of such dye materials, the most preferred being organic pigments which provide photographic elements for tanning development with a better stability over time.
  • Particularly useful proved to be some organic pigments sold in water dispersion, such as for instance Flexonil Blau@ of Hoechst, Rosso Sintosol@ NFRG, Arancio Velesta@ NPG, as well as Turchese Sintosol@ of ACNA.
  • Such water dispersions are obtained by suspending the water-insoluble pigments in water containing a water-soluble solvent or polymer which acts as a support for the pigments themselves, as known in the art.
  • tanning developers whose oxidation products formed while developing the exposed element are capable of tanning the gelatin, the most preferred is hydroquinone (and the derviatives thereof such as chlorohydroquinone, bromohydroquinone, methylhydroquinone, morpholinohydroquinone) because of its wider action range due to a better stability of its oxidation product, but also other tanning developers such as pyrocatechol, pyrogallol and gallic acid can find an application in the photographic elements for tanning development of the present invention alone or in combination with hydroquinone.
  • pyrocatechol gave very good results as regards sensitivity, image quantity, definition and exposure latitude. Elements containing pyrocatechol proved also to have a longer shelf life.
  • a single gelatin layer coated on the base can at the same time contain the silver halide emulsion, the colored pigment, the tanning developer and the auxiliary developer, or such components of the photographic element can be distributed in separate gelatin layers coated on the base, for instance a gelatin layer containing the pigment and the auxiliary developer and a gelatin layer containing the silver halide emulsion and the tanning developer, or finally the said components can be contained in gelatin layers coated onto different bases to be put into contact during development.
  • Particularly useful to the purpose of the present invention proved to be the presence of a protective gelatin layer coated on the photographic element in order to obtain a better coating quality and a better image quality of the developed element.
  • the auxiliary developers can be introduced during coating into the protective layer of the photographic element, into the gelatin layer containing the silver halide emulsion, into the gelatin layer containing the colored pigment or into the gelatin layer containing both the silver halide emulsion and the colored pigment. Of course immediately after coating, a given quantity of the auxiliary developer will diffuse into the adjacent gelatin layers, -if present.
  • the photographic elements for tanning development of the present invention are developed by dipping them into an activating bath, followed by a stop bath and finally by washing them with water sprays.
  • the activating bath contains an alkalizing agent such as sodium or potassium carbonate, sodium or potassium hydroxide.
  • Particularly useful was an activating bath including significant quantities of a water-miscible organic solvent, chosen in the class including dihydric alcohols, polyhydric alcohols and polyoxyethyleneglycols or mixtures thereof, and more particularly useful an activating bath including significant quantities of sodium sulfate in order to improve the quality and repeatability of the obtained photographic results, especially when processing is performed with automatic processors provided with transporting rollers in contact with the air.
  • the stop bath can be a fixing bath, preferably a bleach-fixing bath (containing ferric-ammonium EDTA and thiosulfate), or an acid bath containing diluted acetic acid, or simply water.
  • a bleach-fixing bath containing ferric-ammonium EDTA and thiosulfate
  • an acid bath containing diluted acetic acid, or simply water.
  • emulsion A is a silver bromo-iodide emulsion having 7% iodide moles, a means silver halide grain size of 0.75 pm and at least 90% of the grains with a size comprised between 0.35 and 1.6 pm. It is an emulsion which is used in color photographic materials (negative and reversal) which can be found on the market (such as 3M Color Print 100 ASA) and which, in the presence of a coupler, exposed for 1/20" at 5500°K and developed in the conventional (C41 type such as 3M CNP 4 Chemicals for color negative processing) color processings, shows a sensitivity of about 100 ASA.
  • Emulsion B is a silver bromo-chloro-iodide emulsion having 5% chloride moles and 7% iodide moles, a silver halide grain size of about 0.35 pm and at least 60% of the grains with a size between 0.35 and 0.9 ⁇ m. It is an emulsion which is used in color photographic materials (negative and reversal) which can be found on the market (such as 3M Color Print 100 ASA) and which, in the presence of a coupler, exposed for 1/20" at 5500°K and developed in the conventional color processings, shows a sensitivity of about 40 ASA.
  • Emulsion C is a low-sensitivity silver bromo-chloride emulsion having 66% chloride moles, a mean silver halide grain size of 0.29 fl m and only 13% of the grains with a size higher than 0.35 ⁇ m. It is an emulsion which is used in the materials for graphic arts which can be found on the market and which, exposed for 10" at 5200°K and developed in the conventional black-and-white processings, shows a sensitivity of about 0.4 ASA.
  • a photographic element (Film A) for tanning development was prepared by coating a 10/100 resin-coated paper base with the following layers in the indicated order:
  • a second element (Film B) was prepared like the first one, but having coated on the base the following layers in the indicated order:
  • a third element (Film C) was prepared like the first one, having coated on the base the following layers in the indicated order:
  • a fourth element (Film D) was finally prepared like the first one, having coated on the base the following layers in the indicated order:
  • Samples of the four elements were exposed in a 7700 Compugraphic Editwriter Phototypesetter at 1000 volts for 3 microseconds and processed in a roller automatic processor (Eskofot 965 Processor) in an activating bath (consisting of 700 ml. of 18% Na 2 CO 3 and 300 ml. of ethyleneglycol) at 28°C, then in a stop bath (consisting of 0.2% acetic acid) at 40°C and finally washed with water sprays at room temperature.
  • a roller automatic processor Engelfot 965 Processor
  • a photographic element (Film A) for tanning development was prepared by coating a 10/100 resin-coated paper base with the following layers in the indicated order.
  • a second, third and fourth element (Film B, C and D) were prepared by coating a 10/100 resin-coated paper base with the following layers in the indicated order:
  • Samples of the four films were exposed in a stroboscope under the same conditions as those reported in Example 1 and processed in a roller automatic processor in an activating bath with water sprays as described in Example 1.
  • Samples of Film A were completely non-tanned and therefore no image was formed; samples of Film B were non-tanned only on the image edges; samples of Films C and D were tanned in a satisfactory manner.
  • the image quality became better as the amount of phenidone increased in the insensitive pigmented layer.
  • a photographic element (Film A) for tanning development was preapred by coating a 10/100 resin-coated paper base with the following layers in the indicated order:
  • a second and a third elements were prepared like the first one, having coated on the base the following layers in the indicated order:
  • Samples of the six elements were exposed in a stroboscope for 3.microseconds under lighting conditions equal to those described in Example 1 and processed for 40" in an activating bath, then in a stop bath and finally washed with water sprays as described in the preceding Examples.
  • Three photographic elements (Films A, B and C) for tanning development were prepared by coating a 10/100 resin-coated paper base with the following layers in the indicated order:

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
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  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Claims (14)

1. Photographisches Element für gerbende Entwicklung, das mit kurzen Belichtungszeiten an Licht mit hoher Intensität zu verwenden ist und das mindestens eine ungehärtete Gelatineschicht in Verbindung mit einer lichtempfindlichen Silberhalogenidemulsion, einem Farbpigment und einem gerbenden Entwickler aufweist, wobei die Silberhalogenidemulsion Silber in einer Menge von weniger als 0,6 g/m2 enthält und ein Silber-zu-Gelatine-Gewichtsverhältnis von unter 0,4 hat, gekennzeichnet dadurch, daß die Silberhalogenidemulsion eine Empfindlichkeit von mindestens 20 ASA aufweist-wenn sie zusammen mit einem Sensibilisator und einem 5-Pyrazolon-Magenta-Kuppler vorliegt, durch einen Stufenkeil belichtet und mit einem p-Phenylendiamin-Entwickler entwickelt wurde-und zusammen mit einer 3-Pyrazolidinon-Verbindung vorliegt.
2. Photographisches Element nach Anspruch 1, wobei die Silberhalogenidemulsion mindestens 4 Molprozent Silberjodid enthält.
3. Photographisches Element nach Anspruch 1, wobei die Silberhalogenid-Emulsion 4 bis 20 Molprozent Silberjodid enthält.
4. Photographisches Element nach Anspruch 1, wobei die Silberhalogenid-Emulsion 5 bis 15 Molprozent Silberjodid enthält.
5. Photographisches Element nach Anspruch 1, wobei die Silberhalogenid-Emulsion eine mittlere Korngröße von mindestens 0,30 um aufweist.
6. Photographisches Element nach Anspruch 1, wobei mindestens 30% der Silberhalogenidkörner eine Größe über 0,30 um aufweisen.
7. Photographisches Element nach Anspruch 6, wobei mindestens 50% der Silberhalogenidkörner eine Größe über 0,30 um aufweisen.
8. Photographisches Element nach Anspruch 7, wobei mindestens 70% der Silberhalogenidkörner eine Größe über 0,30 um aufweisen.
9. Photographisches Element nach Anspruch 1, wobei der gerbende Entwickler Hydrochinon ist.
10. Photographisches Element nach Anspruch 1, wobei der gerbende Entwickler Brenzkatechin ist.
11. Photographisches Element nach Anspruch 1, wobei die 2-Pyrazolidinon-Verbindung 1-Phenyl-3-pyrazodinon ist.
12. Photographisches Element nach Anspruch 1, wobei eine einzige im wesentlichen nicht gehärtete Gelatineschicht die Silberhalogenidemulsion, den gerbenden Entwickler, das wasserunlösliche, photographisch inerte gefärbte Pigment und die 3-Pyrazolidinon-Verbindung enthält.
13. Photographisches Element nach Anspruch 1, umfassend einen Träger, auf dem sich zwei übereinander aufgebrachte ungehärtete Gelatineschichten befinden, von denen eine die Silberhalogenid- Emulsion und den gerbenden Entwickler und die andere das wasserunlösliche photographisch inerte Pigment und die 3-Pyrazolidinon-Verbindung enthält.
14. Photographisches Element nach den Ansprüchen 1 bis 13, wobei die Menge der 3-Pyrazolidinon-Verbindungen im Bereich von 0,005 bis 0,15 g/m2 liegt.
EP83107210A 1982-08-27 1983-07-22 Photographisches Gelatinsilber Aufzeichnungsmaterial für gerbende Entwicklung Expired EP0104351B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT65210/82A IT1193025B (it) 1982-08-27 1982-08-27 Elementi fotografici all alogenuro d argento in gelatina per sviluppo tannante
IT6521082 1982-08-27

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EP0104351A1 EP0104351A1 (de) 1984-04-04
EP0104351B1 true EP0104351B1 (de) 1988-09-14

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EP (1) EP0104351B1 (de)
JP (1) JPS5964838A (de)
AR (1) AR241966A1 (de)
AU (1) AU564245B2 (de)
BR (1) BR8304631A (de)
CA (1) CA1242102A (de)
DE (1) DE3377999D1 (de)
IT (1) IT1193025B (de)

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US4427757A (en) * 1982-08-27 1984-01-24 Minnesota Mining And Manufacturing Company Tannable imaging element
EP0181968A1 (de) * 1984-11-20 1986-05-28 Agfa-Gevaert N.V. Verfahren zur Herstellung von photograhischen Reliefbildern durch gerbende Entwicklung und Wash-Off-Verarbeitung von Silberhalogenidemulsionsmaterialien
IT1185540B (it) * 1985-03-18 1987-11-12 Minnesota Mining & Mfg Materiale fotofrafico agli alogenuri d'argento per sviluppo tannante procedimento per produrre un'immagine in rilievo
IT1185619B (it) * 1985-05-30 1987-11-12 Minnesota Mining & Mfg Materiale fotografico migliorato per sviluppo tannante e metodo per ottenere un'immagine in rilievo
US4988603A (en) * 1988-01-11 1991-01-29 Konica Corporation Method for the formation of high-contrast images using a developer comprising a hydrazine derivative
DE69602228T2 (de) * 1995-06-01 1999-11-04 Agfa Gevaert Nv Verbesserung der Lagerfähigkeit von einem Bildelement zur Herstellung einer Druckplatte nach dem Silbersalz-Diffusionsübertragungsverfahren

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DE3377999D1 (en) 1988-10-20
IT1193025B (it) 1988-06-02
BR8304631A (pt) 1984-04-03
AR241966A1 (es) 1993-01-29
AU564245B2 (en) 1987-08-06
JPS5964838A (ja) 1984-04-12
AU1845783A (en) 1984-03-01
EP0104351A1 (de) 1984-04-04
CA1242102A (en) 1988-09-20
IT8265210A0 (it) 1982-08-27

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