US3709687A - Diffusion transfer receiving element with varing concentration of precipitating nuclei - Google Patents

Diffusion transfer receiving element with varing concentration of precipitating nuclei Download PDF

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US3709687A
US3709687A US00025875A US3709687DA US3709687A US 3709687 A US3709687 A US 3709687A US 00025875 A US00025875 A US 00025875A US 3709687D A US3709687D A US 3709687DA US 3709687 A US3709687 A US 3709687A
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silver
layer
nuclei
image
layers
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E Land
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Polaroid Corp
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Polaroid Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/06—Silver salts
    • G03F7/07—Silver salts used for diffusion transfer
    • 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
    • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
    • G03C8/24—Photosensitive materials characterised by the image-receiving section
    • G03C8/26—Image-receiving layers
    • G03C8/28—Image-receiving layers containing development nuclei or compounds forming such nuclei

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  • ABSTRACT Novel image-receiving elements for obtaining photographic images in silver and photomechanical procedures employing same as an inking master to obtain one or-more ink reproductions of the original subject matter.
  • an exposed light-sensitive silver halide emulsion containing a lo developable image is developed with an aqueous alkaline processing composition including a silver halide developing agent and a silver halide solvent to reduce exposed silver halide to silver while forming from unexposed silver halide an imagewise distribution of soluble silver complex which is then transferred at least in part, by imbibition, to a superposed silver-receptive stratum where it is reduced to image silver to impart thereto a positive silver transfer image.
  • Procedures of this description are disclosed, for example, in U.S. Pat. No. 2,543,18l issued to Edwin H. Land.
  • the silvertransfer image may be characterized further as being selectively inkable with an oleophilic or greasy ink of the type commonly employed in lithography.
  • the inked silver'transfer image may be employed in standard lithographic procedures to provide one or more ink reproductions of the original subject matter.
  • the hydrophilic silver-receptive stratum employed in such photomechanical reproduction procedures typically comprises one of the vigoroussilver-precipitating environments such as is described in U.S. Pat. Nos. 2,698,237 and 2,698,245 issued to Edwin H. Land.
  • Such an environment includes a layer containing silverprecipitating nuclei dispersed in a macroscopically continuous vehicle or matrix.
  • This layer providing the silver-receptive stratum is contained on a suitable support material, typically. a water-permeable material, e.g., a paper base, in which event a layer ofa water-impermeable material is disposed between the silverreceptive stratum and thesupport.
  • the imagereceiving element employed in the aforementioned system for providing an inking master comprises a layer of silverprecipitating nuclei dispersed in a macroscopically continuous matrix, which layer is contained on the surface of a water-impermeable hydrophobic material.
  • the silver-receptive stratum employed to prepare the silver image-printing master is preferably from l to 8 microns thick.
  • the silver-receptive stratum of image-receiving elements for use in the aforementioned lithographic procedures comprises a multilayer structure wherein each layer of the silverreceptive stratum contains a progressively increasing concentration of silver-precipitating nuclei with respect to the concentration of such nuclei contained in adjacent layers as the distance from the support carrying this stratum increases.
  • the silverreceptive stratum comprises at least two layers, each of which contains a different concentration of silverprecipitating nuclei with the topmost layer containing the greatest concentration and the layer closest to the support containing the least.
  • each of the layers of the silver-receptive stratum comprises the same silverprecipitating nuclei disposed in a macroscopically continuous vehicle or matrix of colloidal silica, i.e., a matrix formed of definite particles which are essentially silica and which are sufficiently small to be indistinguishable as particles by the naked eye when formed into a layer and whose minimum average size is of colloidal rather than of molecular proportions.
  • the silver-receptive stratum comprises two layers of the foregoing description.
  • image-receiving elements comprising a multilayer image-receiving or silverreceptive stratum, wherein each layer of the stratum contains a progressively increasing concentration of silver-precipitating nuclei with respect to the concentration of the nuclei contained in adjacent layers with the layer containing the greatest concentration being closest to the support.
  • Image-receiving elements of this description cause the silver halide complex to precipitate as elemental silver deeper within the element, i.e., further removed from the surface, so that the silver image is not characterized as containing silver concentrated primarily at the surface.
  • Silver images of this description possess distinct advantages over images obtained on an element containing a single layer silverreceptive stratum, including the following: elimination of undesired silvering; less externally caused deterioration of the image, less tendency for rub-off, etc.
  • Ser. No. 622,133 is a continuation of application Ser. No. 858,454 filed Dec. 9, 1959, the subject matter of which has issued in certain foreign countries, e.g., in Great Britain as Patent No. 893,652, published on Apr. 1 l, 1962.
  • FIGURE is a diagrammatic, sectional view of an image-receiving element of this invention.
  • this invention relates to photomechanical reproduction'and, more particularly, to procedures wherein an inking master is prepared by silver diffusion transfer photography.
  • a primary object of this'invention is to provide novel systems of the foregoing description for obtaining ink reproductions.
  • Another object is to provide novel image-receiving elements for use in silver transfer procedures for preparing a photographic print in silver which is useful as an inking master.
  • Still another object is to provide a novel imagereceiving element including a silver-receptive stratum having at least two layers containing silver-precipitating nuclei dispersed in a hydrophilic matrix, each of said layers containing a progressively increasing concentration of such nuclei with respect to the concentration of said nuclei in adjacent layers as the distance from the support carrying this stratum increases.
  • Yet another object is to provide novel photographic processes employing these image-receiving elements to obtain silver images useful as inking masters.
  • the invention accordingly comprises the several steps and the relation and order of one or more of such steps with respect to each of the others, and the product possessing the features, properties and the relation of elements which are exemplified in the following detailed disclosure, and the scope of the application of which will be indicated in the claims.
  • the present invention is directed to photomechanical procedures for forming ink reproductions, and in particular to procedures of the type described in US. Pat. No. 3,220,837wherein a photosensitive element comprising a lightsensitive silver halide layer is exposed to provide a developable image of the subject matter to be reproduced and the thus exposed element is then developed with an aqueous alkaline processing composition to reduce exposed silver halide and to form from unexposed silver halide an imagewise distribution of a soluble silver complex which is transferred at least in part, by diffusion, to a silver-receptive stratum to impart thereto a silver transfer image characterized as having image areas containing silver concentrated primarily at the surface of this stratum in dense oleophilic masses and nonimage or highlight areas which are hydrophilic.
  • the resulting silver transfer image may be employed as an inking master in standard lithographic procedures to prepare one or a plurality of ink reproductions of the original.
  • the silver print is wetted with an oleophilic or greasy ink which selectively adheres only to the oleophilic silver areas.
  • the silver-receptive stratum employed to prepare the silver print-inking master in general consists essentially of-a layer containing silver-precipitating nuclei dispersed in a macroscopically continuous hydrophilic vehicle or matrix.
  • silver-precipitating nuclei are the metallic sulfides and selenides, these terms being understood to include the selenosulfides, the polysulfides, and the polyselenides.
  • Preferred in this group are the so-called heavy metal sulfides, particularly those whose solubility products in an aqueous medium at approximately 20 C vary between 10' and l0'
  • Usefulheavy metal salt silverprecipitating nuclei include sulfides of zinc, chromium, gallium, iron, cadmium, cobalt, nickel, lead, antimony, bismuth, silver, cerium, arsenic, copper and rhodium; and the selenides of lead, zinc, antimony and nickel.
  • Another class of useful precipitating agents are heavy metals such as silver, gold, platinum, palladium and mercury, and in this category the noble metals are preferred, these being preferably provided in the matrix as colloidal particles.
  • the salts of these metals preferably the simple inorganic and readily reducible salts such as silver nitrate, gold chloride and gold nitrate, are also useful as silver-precipitating agents.
  • thio compounds e.g., dithiooxamate and its lead and zinc complexes, potassium dithiooxamate and the lead and nickel complexes thereof, thioacetamide, etc.
  • the silver-precipitating nuclei are contained or dispersed in a suitable hydrophilic matrix formed of particles, preferably colloidal in size, of a chemically inert, absorbent material.
  • suitable hydrophilic matrix formed of particles, preferably colloidal in size, of a chemically inert, absorbent material.
  • Useful materials for forming the matrix include colloidal silica, such as silica aerogel, fullers earth, diatomaceous earth, kieselguhr, wood flour, infusorial earth, bentonite, filter aids such as Celite and Super-floss (trade names of Johns-Manville Sales Corp. for diatomaceous earth filtration aids), and finely powdered glass, talc, mica or zinc oxide.
  • colloidal silica such as silica aerogel, fullers earth, diatomaceous earth, kieselguhr, wood flour, infusorial earth, bentonite
  • filter aids such as Celite and Super-floss (trade names of Johns-Man
  • Silver-precipitating strata comprising a layer containing such silver-precipitating nuclei in a hydrophilic macroscopically continuous matrix of the foregoing description are disclosed in numerous patents of which mention may be made-of US. Pat. Nos. 2,647,056, 2,698,237 and 2,698,245 issued to Edwin H. Land.
  • the silverreceptive stratum is typically contained on a suitable support material such as paper, regenerated cellulose, polyvinyl alcohol, cellulose ethers such as methyl cellulose, ethyl cellulose, or other plastic materials.
  • a suitable support material such as paper, regenerated cellulose, polyvinyl alcohol, cellulose ethers such as methyl cellulose, ethyl cellulose, or other plastic materials.
  • the support material is either water-repellant or a layer of a hydrophobic material may be disposed between the silver-receptive stratum and the support.
  • This hydrophobic underlayer may comprise one of the class of hydrophobic materials known to adhere well to the silver-receptive stratum, e.g., one of the cellulosic esters such as cellulose nitrate, cellulose acetate, cellulose butyrate, cellulose propionate, cellulose acetate butyrate, cellulose acetate propionate; a rubbery polymer such as polyvinyl butyral, etc.
  • one of the cellulosic esters such as cellulose nitrate, cellulose acetate, cellulose butyrate, cellulose propionate, cellulose acetate butyrate, cellulose acetate propionate
  • a rubbery polymer such as polyvinyl butyral, etc.
  • the support is a paper base and the silverreceptive stratum is deposited on a hydrophobic layer of the foregoing description. Additional layers performing specific desired functions may also be contained on this support, for example, a stripping layer, e.g., gum arabic, cellulose acetate hydrogen phthalate, polyvinyl alcohol, hydroxyethyl cellulose, methyl cellulose, ethyl cellulose, sodium alginate, etc. may be provided over the silver receptive stratum in accordance with procedures well known in the art to facilitate clean separation of the image-receiving element containing the silver image following development.
  • a stripping layer e.g., gum arabic, cellulose acetate hydrogen phthalate, polyvinyl alcohol, hydroxyethyl cellulose, methyl cellulose, ethyl cellulose, sodium alginate, etc. may be provided over the silver receptive stratum in accordance with procedures well known in the art to facilitate clean separation of the image-receiving element containing the silver
  • the silver-receptive stratum of image-receiving elements heretofore suggested for use in the photomechanical reproduction procedures to which this invention is directed comprised a single layer on the order of l-8 microns thick. Because of the difficulty in the commercial production of silver-receptive strata of such thicknesses, attempts were made to provide them as thinner layers.
  • the silver-receptive stratum of image-receiving elements heretofore suggested for use in the photomechanical reproduction procedures to which this invention is directed comprised a single layer on the order of l-8 microns thick. Because of the difficulty in the commercial production of silver-receptive strata of such thicknesses, attempts were made to provide them as thinner layers.
  • the thinner layers inherently produced certain disadvantages, chief of which was the tendency for the silver-receptive stratum to be at least partially removed after repeated inkings by the combined effects of the fountain solution commonly employed in lithography and the abrasive action of the rollers on the printing press, so that ultimately the hydrophobic underlayer was partially revealed to in turn cause some background inking on subsequent copies.
  • a silverreceptive stratum consisting of a plurality of layers containing progressively lesser amounts of silverprecipitating nuclei as the distance from the outer surface of the stratum increases, or, stated another way, a progressively greater concentration of such nuclei as the distance from the support increases. While in the preferred embodiment the silver-receptive stratum comprises two such layers, it is contemplated that three or more of these layers may be employed to provide the silvenreceptive stratum. Each of these layers is relatively thin, preferably on the order of a micron or less in thickness.
  • the ratio of silver precipitating nuclei in one layer to the next adjacent layer is preferably 2:1 to 50:1, the most preferred ratio being from 5:1 to 15:1.
  • the topmost layer preferably contains silver-precipitating nuclei in an amount on the order of from about 2 to about 25 #g (micrograms) per square foot, the ratio of nuclei in this layer to the hydrophilic matrix material, e.g., colloidal silica, being from about l:lO,()()0 to about 1:2,000. As used throughout this description, all ratios are by weight.
  • an image receiving element of this invention may comprise support 10 carrying a water-proof subcoat, Le, a
  • hydrophobic layer 12 layers 14 and 16 comprising the silver receptive stratum and a stripping layer 18.
  • Support 10 may be any of the materials heretofore mentioned and/or known in the art for such purposes, e.g., coated or uncoated paper, a cellulose ester such as cellulose nitrate, cellulose acetate, cellulose acetate butyrate, cellulose propionate, etc.
  • a cellulose ester such as cellulose nitrate, cellulose acetate, cellulose acetate butyrate, cellulose propionate, etc.
  • Hydrophobic layer 12 may comprise one of the heretofore mentioned class of hydrophobic materials known to adhere well to the silver-receptive stratum and may, for example, be on the order of from l2.5 microns thick.
  • the silver-receptive stratum is shown to comprise a pair of layers 14 and 16, each containing silverprecipitating nuclei dispersed in a suitable matrix, as previously described; preferably each of layers 14 and 16 comprises one of the known heavy metal sulfide silver-precipitating agents in a siliceous matrix.
  • the siliceous material comprising this matrix may contain, in colloidal or finely divided condition, oxides of silicon, particularly those in the form of silica acids like silica aerogel, and mineral silicates such as mica and talc.
  • Syton trademark of Monsanto Chemical Co.
  • Ludox trademark of E. l. duPont de Nemours & Co. for an aqueous colloidal sol containing approximately 30% SiO with less than 0.5% Na O as stabilizer, sp. gr. 1.21).
  • Layers 14 and 16 may be made of the same or different materials and preferably are the same, differing only in the concentration of silver-precipitating nuclei present.
  • layer 16 contains the greater concentration of such nuclei and may typically contain on the order of 2-25 pg. per square foot of surface area.
  • Layer 14 preferably contains from one-half to one-fiftieth the amount of nuclei in layer 16, and preferably contains from one-fifth to one-fifteenth that amount.
  • the ratio of nuclei to matrix material in layer 16, as heretofore noted, is preferably onthe order of from about l:l0,000 to about 1:2,000.
  • Stripping layer 18 may be any of the materials heretofore mentioned which are commonly employed to facilitate a clean separation of a silver print following processing. It preferably has a thickness on the order of at least 1 micron.
  • the image-receiving elements of this invention may be prepared in accordance with the procedures commonly employed in the preparation of image-receiving elements for use in silver diffusion transfer. Since the procedures for applying the various layers per se are old, being described, for example, in certain of the aforementioned patents, U.S. Pat. No. 2,823,122 issued to Edwin H. Land as well as other patents, they need not be discussed in great detail.
  • a hydrophobic layer 12 For purposes of illustration, however, they may be prepared by first coating on a suitable support 10 a hydrophobic layer 12.
  • a typical procedure of this nature is to apply by roll-coating on the support, e.g., on the baryta-coated surface of a sheet of baryta paper, a solution of the selected hydrophobic material to provide a layer of the desired thickness.
  • a solution of the selected hydrophobic material to provide a layer of the desired thickness.
  • layers 14 and 16 comprising the silverreceptive stratum are successively applied.
  • aqueous dispersion of the siliceous material e.g., silica aerogel
  • a substantially lesser molar quantity of a soluble salt of the desired anion is added, e.g., a soluble sulfide such as sodium sulfide.
  • a soluble sulfide such as sodium sulfide.
  • the sulfide anion and the heavy metal cation then combine to form the heavy metal sulfide in situ, thus providing a dispersion of the heavy metal sulfide silverprecipitating agent in the silica matrix.
  • each of layers 14 and 16 may be prepared by first forming an aqueous solution containing desired amounts of sodium sulfide and powdered selenium. A coating composition formed by mixing desired amounts of the aforementioned solution, silver nitrate solution, and Ludox colloidal silica may then be coated to the desired thickness to in turn provide the particular desired silver-precipitating environment.
  • the respective layers of the silver-receptive stratum be dried prior to successive coating operations.
  • the interface between contiguous layers may dissipate, particularly where a common matrix material is used for the respective layers.
  • the interface between the respective layers of the elements of this invention may not be as sharply defined and distinguishable as that shown in the illustrative schematic drawing.
  • stripping layer While the presence of a stripping layer is not essential to the practice of this invention, it is preferred that such a layer be included to facilitate separation of the transfer image, and such a layer is accordingly included in the drawing for purpose of illustration.
  • layer 18 is applied in the manner previously well known in the art, e.g., by roll-coating against a smooth surface, such as the polished surface of a metal drum, a solution of the desired material to provide layer 18 of the requisite thickness.
  • the image-receiving elements of this invention e.g., as described above and shown in the illustrative drawing, are employed to obtain a silver print-inking master in exactly the same way as the prior receiving elements, namely in the manner described in the aforementioned U.S. Pat. No. 3,220,837.
  • such procedures may include the steps of exposing a photosensitive element comprising a light-sensitive silver halide layer, e.g., a high speed gelatino silver iodobromide emulsion, to form a developable image; thereafter applying to the thus exposed element an aqueous alkaline processing composition including a silver halide developing agent and a silver halide solvent to develop exposed and developable silver halide and to form from unexposed silver halide an imagewise distribution of a soluble silver complex which is transferred, by diffusion, to a superposed image-receiving element of this invention to provide a positive silver transfer image characterized as having image silver deposited primarily at the surface in the, aforementioned manner.
  • a photosensitive element comprising a light-sensitive silver halide layer, e.g., a high speed gelatino silver iodobromide emulsion
  • an aqueous alkaline processing composition including a silver halide developing agent and a silver halide solvent
  • the processing composition employed in such procedures includes the materials common to silver diffusion transfer, namely an alkaline material such as sodium or potassium hydroxide; at least one silver halide developing agent such as one of the known dihydroxybenzene, diaminobenzene or aminophenol developing agents; and at least one silver halide solvent such as sodium or potassium thiosulfate. It may also include various other reagents performing specific desired functions, e.g., a viscous film-forming reagent such as sodium carboxymethyl cellulose or hydroxyethyl cellulose, stabilizers, preservatives and the like.
  • an alkaline material such as sodium or potassium hydroxide
  • at least one silver halide developing agent such as one of the known dihydroxybenzene, diaminobenzene or aminophenol developing agents
  • at least one silver halide solvent such as sodium or potassium thiosulfate. It may also include various other reagents performing specific desired functions, e.g., a viscous film-forming rea
  • reagents may be contained initially in the processing composition or, in lieu thereof, any of them may be present initially in one or more layers of the photosensitive and/or image-receiving elements, in which event the desired processing composition is obtained by applying the aqueous medium therefor.
  • the processing composition (or at least the aqueous medium therefor) is contained in a pod or frangible container adapted for spreading its contents between the respective elements when placed in superposition, in accordance with known structures and procedures.
  • the photomechanical reproductive procedures of this invention may be employed for line copy, or for preparing ink reproductions of exceptional quality of continuous tone subject matter.
  • the photosensitive element is photoexposed through a halftone screen of the type known in the art, to provide a halftone print which is then employed as an inking master to provide halftone ink reproductions of outstanding fidelity and tonal quality.
  • the silver print of the subject matter to be reproduced may be employed in conjunction with standard lithographic procedures and printing presses.
  • a Multilith Offset Duplicating machine commercially available from Addressograph-Multigraph Corporation.
  • a fountain solution (a solution commonly employed in offset printing machines to enhance selective inking) is typically provided.
  • Colitho 365 High Speed Solution Coldia Ribbon and Carbon, lnc.
  • a universal plate etch and fountain solution for direct image and sensitized paper, acetate and metal offset plates.
  • the ink form roller of the machine has applied thereto any of the commonly employed greasy inks, e.g., a black ink such as Formulator No. 71 Black" (Glenn Killian Color Co.).
  • a black ink such as Formulator No. 71 Black
  • a machine of this type may feed copy paper at a rate of 9,000 sheets per hour; although other known devices which are much faster may also be employed. In this manner, the desired number of ink reproductions are run off.
  • EXAMPLE On a paper base sheet material was coated a layer of polyvinyl butyral. Over this was applied a composition containing silver sulfide dispersed in Ludox colloidal silica at a ratio of 0.0256 grams of silver per 1,000 grams ofLudox" colloidal silica to provide a layer less then one-half micron in thickness having a calculated coverage of about 0.5 micrograms of silver ions per square foot of surface area.
  • a second coating composition was applied thereover containing silver sulfide dispersed in Ludox" colloidal silica at a ratio of 0.256 grams of silver per L000 grams of Ludox" colloidal silica to provide a layer of approximately equal thickness but having approximately 10 times as much silver sulfide per square foot.
  • a stripping layer of gum arabic was applied to provide an image-receiving element such as is shown in the drawmg.
  • the image-receiving element prepared in the foregoing example was employed to prepare a silver print printing master in accordance with the procedures previously described.
  • a silver print printing master When employed as a printing master on a standard offset printing device, no background inking was observed after repeated inkings and run-offs, thereby demonstrating the efficacy of the invention in obviating the heretofore mentioned problem of background inking.
  • the ink reproductions obtained in this manner, whether line copy, or halftone reproductions obtained by exposure through a halftone screen, were characterized as excellent.
  • An image-receiving element for preparing a silver transfer print comprising a support bearing on one side thereof a plurality of contiguous layers, each of said layers including silver-precipitating nuclei dispersed in a hydrophilic matrix, the concentration of said nuclei in said layers being progressively greater, layerwise, as the distance from said support increases.
  • nuclei comprise at least one heavy metal sulfide and said matrix comprises colloidal silica.
  • An element as defined in claim 1 including a hydrophobic layer disposed between said support and said contiguous layers containing said silver-precipitating nuclei.
  • An element as defined in claim 5 including a stripping layer disposed over said layer containing silver-precipitating nuclei furthest removed from said support.
  • An element for use in preparing a printing master by silver diffusion transfer comprising a support bearing on one side thereof, in order, a layer of a hydrophobic material, a first layer containing silver-precipitating nuclei dispersed substantially uniformly in a hydrophilic siliceous matrix and a second layer containing silverprecipitating nuclei dispersed substantially uniformly in a hydrophilic siliceous matrix, said silver-precipitating nuclei in each of said layers being selected from the group consisting of metallic sulfides, metallic selenides, colloidal metals, thiooxalates and thioacetamides, the ratio by weight of said nuclei in said second layer to said nuclei in said first layer being from about 2:1 to about 50:].
  • nuclei in each of said layers comprises a heavy metal sulfide.
  • An element as defined in claim 12 including a stripping layer disposed over said second layer.
  • a printing master consisting essentially of an element comprising a support bearing on one side thereof, in order, a layer of a hydrophobic material, a first layer containing silver-precipitating nuclei dispersed substantially uniformly in a hydrophilic siliceous matrix, and a second layer containing silver-precipitating nuclei dispersed substantially uniformly in a hydrophilic siliceousmatrix, saidsilver-precipitating nuclei in each of said layers being selected from the group consisting of metallic sulfides, metallic selenides, colloidal metals, thiooxalates and thioacetamides, the ratio by weight of said nuclei in said second layer to said nuclei in said first layer being from about 2:1 to about 50:1, said element containing a silver image having image areas containing'silver concentrated primarily at the I surface of said element in thin but essentially continuous oleophilic dense masses.
  • a silver transfer image useful as a printing master wherein an exposed silver halide layer containing a developable image of the subject matter to be reproduced is contacted with a developing composition to develop said' image and to form asilver image by diffusion transfer on a superposed im age-receiving element, said silver transfer image having image areas containing silver concentrated primarily at the surface of said image-receiving element in oleophilic dense masses and non-image areas which are hydrophilic;
  • said image-receiving element comprises a support bearing on one side thereof, in order, a layer of a hydrophobic material, a first layer containing silver-precipitating nuclei dispersed substantially uniformly in a hydrophilic siliceous matrix and a second layer containing silverprecipitating nuclei dispersed substantially uniformly in a hydrophilic siliceous matrix, said silver-precipitating nuclei in each of said layers being selected from the group consisting of metallic sulfides, metallic selenides, colloidal metals, thiooxalates and thioacetamides, the ratio by weight of said nuclei in said second layer to said nuclei in said first layer being from about 2:1 to about 50: l
  • a process as defined in claim 16 including the step of applying an oleophilic ink to said silver transfer image, said ink preferentially wetting only said silver ima e areas.
  • a process as defined in claim l7 including the step of transferring said ink from said inked master to provide an ink reproduction of said original subject matter.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Color Printing (AREA)
US00025875A 1970-04-06 1970-04-06 Diffusion transfer receiving element with varing concentration of precipitating nuclei Expired - Lifetime US3709687A (en)

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JP (1) JPS542097B1 (fr)
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CA (1) CA940362A (fr)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5618650A (en) * 1994-11-29 1997-04-08 Agfa-Gevaert, N.V. Imaging element and method for making a printing plate according to the silver salt diffusion transfer
US5629131A (en) * 1995-05-02 1997-05-13 Agfa-Gevaert, N.V. Image receiving layer for use in a silver salt diffusion transfer process
US5707775A (en) * 1995-10-20 1998-01-13 Agfa-Gevaert, N.V. Imaging element and method for making a lithographic printing plate according to silver salt diffusion transfer processing

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US2834676A (en) * 1955-07-19 1958-05-13 Sperry Rand Corp Photographic diffusion transfer process for producing multiple direct positive copies
US3220837A (en) * 1955-07-22 1965-11-30 Polaroid Corp Diffusion transfer to stratum of a silver image inked and used in printing
US3278958A (en) * 1955-03-31 1966-10-18 Dick Co Ab Method of imaging a photolithographic plate and elements for use in the preparation of same
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US5618650A (en) * 1994-11-29 1997-04-08 Agfa-Gevaert, N.V. Imaging element and method for making a printing plate according to the silver salt diffusion transfer
US5629131A (en) * 1995-05-02 1997-05-13 Agfa-Gevaert, N.V. Image receiving layer for use in a silver salt diffusion transfer process
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Also Published As

Publication number Publication date
JPS542097B1 (fr) 1979-02-02
DE2116788A1 (de) 1971-10-21
DE2116788B2 (de) 1978-11-23
FR2089182A5 (fr) 1972-01-07
CA940362A (en) 1974-01-22
GB1348046A (en) 1974-03-13
BE765353A (fr) 1971-10-06
NL170669B (nl) 1982-07-01
NL170669C (nl) 1982-12-01
NL7104591A (fr) 1971-10-08
DE2116788C3 (de) 1979-08-02

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