US3637376A - Silver salt diffusions copyimg method - Google Patents

Silver salt diffusions copyimg method Download PDF

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Publication number
US3637376A
US3637376A US703026A US3637376DA US3637376A US 3637376 A US3637376 A US 3637376A US 703026 A US703026 A US 703026A US 3637376D A US3637376D A US 3637376DA US 3637376 A US3637376 A US 3637376A
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United States
Prior art keywords
solution
negative
liquid
sheet
silver
Prior art date
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 - Lifetime
Application number
US703026A
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English (en)
Inventor
Rudolf Wendt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lumoprint Zindler KG and Co GmbH
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Lumoprint Zindler KG and Co GmbH
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Filing date
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Application filed by Lumoprint Zindler KG and Co GmbH filed Critical Lumoprint Zindler KG and Co GmbH
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Publication of US3637376A publication Critical patent/US3637376A/en
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Expired - Lifetime legal-status Critical Current

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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
    • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
    • G03C8/02—Photosensitive materials characterised by the image-forming section
    • G03C8/04—Photosensitive materials characterised by the image-forming section the substances transferred by diffusion consisting of inorganic or organo-metallic compounds derived from photosensitive noble metals
    • G03C8/06—Silver salt diffusion transfer

Definitions

  • the invention provides that the receiving sheetis uncoated sheet material which, prior to the pressure contact with the negative material, is moistened with a liquid of different composition than said developer liquid, the liquid comprising an aqueous alkaline or acidic solution containing a substance exhibiting amphoteric properties and being capable of reducing silver salts to silver.
  • dissolving silver halides such as, for example, sodium thiosulphate and/or reacting substances which produce in the medium difficulty soluble silver compounds and/or compounds which form developing nuclei or are such nuclei, such as, for example, sodium sulphite, stannochloride, and others.
  • the practical embodiment of this method for commercial use with foliate copying material comprises separate positive or receiving layers containing reducing nuclei. This layer is arranged on a special carrier such that layer and carrier form together the receiving material.
  • material as used in the following specification comprises also foliate materials.
  • the said patent specification mentions also a multilayer material as negative material.
  • the receiving layer is applied to a carrier and an unhardened silver halide solution is poured over the receiving layer.
  • the receiving layer is applied as covering layer over the negative layer.
  • this layer need not contain reducing nuclei, and these are supplied by the treatment liquid to the colloidal receiving or covering layer.
  • Such reducing nuclei are: sulphides, selenides, polysulphides, polyselenides, thiourea, mercaptanes, stannous halides, heavy metals and their salts and cloudy silver halide, suplphides of heavy metals such as antimony, bismuth, cadmium, cobalt, lead, nickel and silver.
  • heavy metals for example, silver, gold, platinum, palladium and mercury, particularly in colloidal form, as well as the noble metals are most efficient.
  • the Belgian Pat. Nos. 635,811 through 635,813 describe a modification of the known method with two distinct sheets for the receiving and negative materials, which has become known as the Copyrapid-Dry Method.
  • the production of pictures or copies on an unprepared receiving material has not been successful.
  • an additional special layer was provided on the negative material and developing nuclei were to be supplied thereto by the treatment fluid.
  • the coating of the receiving material has again been adopted in order to produce copies which are as dry as possible.
  • the coating of the receiving material contains fillers. This method is based on the consideration that at least a thin layer of the additional coating of the negative material is transferred to the receiving material.
  • this method is characterized by a physical transfer of coating.
  • the originally bad adhesion of the originally proposed treatment liquid was avoided by incorporating the developing nuclei and/or the substances capable of forming these nuclei again into the receiving layer and ad ding the developing substances both to the negative and to the positive materials.
  • the treatment liquid is here merely a socalled activator.
  • the used liquids are not subject to any disadvantages either from the viewpoint of durability, or from that of their use for the development of the negative or for the impregnating of the positive material.
  • the execution of this method and especially the production of the associated apparatus is costly and requires expensive safeguards due to the fact that the transport of even minute quantities of one treatment solution into the other must be avoided, because otherwise the durability of the treatment solutions would be seriously impaired.
  • this method has the advantage that a usable silver picture is produced on an uncoated receiving material by means of the silver salt diffusion transfer method.
  • the present invention has the object of improving this method and of eliminating the incompatibility of two treatment solutions.
  • the treatment liquid for the receiving material is an aqueous alkaline or acid solution containing as reaction substance a substance with amphoteric properties and capable of forming, both in the alkaline and in the acidic ranges, compounds which are reducing agents and which can reduce silver salts.
  • these compounds can be formed both in the alkaline and in the acidic ranges.
  • Tin (ll) salts and aluminum chloride are preferred amphoteric substances.
  • uncoated receiving material designates merely a foliate material which does not contain any film-fonning colloids.
  • the material is wetted with an aqueous alkaline or acid solution only during the execution of the method for producing a copy.
  • the invention affords the possibility, not only of using simple and cheap materials, but also particularly sheets, e.g., of paper, which may have been imprinted preliminarily with other matter.
  • the method makes use of a treatment liquid which is cheaper than the noble metal salt solutions hitherto proposed.
  • negative material relates to a foliate element with a silver halide emulsion layer on which a water-permeable covering layer has been arranged as top layer.
  • this material contains developing substances or combinations of such substances, as well as tint improving substances and other materials favoring the execution of the silver salt diffusion method, and known in the art.
  • Such a material is known and is commercially available as Copyrapid-Dry Negative.”
  • activator solution means in its simplest form:
  • EXAMPLE 1 A negative material (CopyrapidDry negative) is exposed and brought into contact with a receiving material of paper, after development in the activator solution provided for this purpose; the receiving material has been wetted in a separate bath, having the following composition:
  • activator solution 100 ml. 1 percent aqueous tin (ll) chloride solution 10 ml. 1 percent aqueous sodium hydroxide solution.
  • EXAMPLE 2 As in example I, but with a treatment liquid for the receiving material having the following composition:
  • EXAMPLE 4 As in example 1, but with a treatment liquid for the receiving material of an acid solution of tin (ll) chloride with the following composition;
  • EXAMPLE 5 As in example 4, but with a treatment liquid for the receiving material having the following composition:
  • EXAMPLE 6 Production of copies as described in examples I through 5. After producing the first copy, the light-sensitive material is again wetted with activator solution and pressed on to a receiving sheet wetted with the treatment solution specified for the positive. Thus, two positive copies are obtained from an exposed, light-sensitive material.
  • the reverse of the receiving sheet may be subjected to the same steps in conjunction with another exposed negative.
  • a two-sided positive copy is produced on the receiving sheet.
  • EXAMPLE 8 As in example i, but with a treatment solution for the positive sheet having the following composition:
  • Such guide webs may be, for example, webs elevated above the bottom of the bath, over which the foliate materials pass so that they are not in contact with the precipitate.
  • the treatment solutions for the receiving sheet could be reactivated after consumption of the reacting substances by adding new reaction concentrate, either in the form of salts or their solutions, or in the form of metal tin as foil or powder. It is also safe to add from the beginning sufficient quantities of the amphoteric substance and more particularly of metallic tin, whereby the utilization of the solution is substantially improved without impairing its functional capabilities. in addition, further substances may be added to the solution which favorably affect the silver salt diffusionmethod, such as, e.g., picture tint improving agents, substances preventing yellowing, and the like.
  • EXAMPLE 9 A negative material (Copyrapid-Dry Negative) is exposed and, after developing in an apparatus constructed for carrying out the conventional silver salt diffusion method, is brought into contact with an uncoated receiving sheet wetted in the same treatment solution.
  • the single bath solution for carrying out this method has the following composition:
  • the method is described in conjunction with the accompanying drawing.
  • 1 shows the receiving material.
  • the negative material 5 is composed of the foliate element 2, the silver halide emulsion layer 3 and the covering layer 4.
  • the figure shows that a document is exposed to the negative material 5 by means of an exposing lamp 7.
  • a device can be used which has a first bath 8 with an activator solution and a second bath 10 with a treatment liquid ll.
  • a wetting-roller 12 in bath 10 rotates a wetting-roller 12. Above this wetting-roller a guide element I3 is arranged, which guides the receiving material over the wetting-roller. Behind the baths 9 and 10 is mounted a pair of squeezing and advancing rollers 14. Between the rollers both materials, wetted in the respective baths, were pressed together.
  • the negative material After exposing, the negative material will be put in the apparatus according to arrow 16 and the receiving material 1 according to arrow 15, and both materials will bewetted and guided to the pair of squeezing and advancing rollers.
  • a silver salt diffusion transfer method wherein an image is formed by exposure on the silver halide emulsion layer of a negative sheet and thus exposed negative sheet is developed by a developer liquid, whereupon the developed image is transferred by pressure contact to a receiving sheet
  • the improvement which comprises that the receiving sheet is uncoated sheet material which, prior to the pressure contact with the negative material, is moistened with a liquid compatible with said developer liquid, said liquid comprising an aqueous alkaline or acidic solution containing about I percent by weight of a tin (ll) salt or aluminum chloride, said liquid, per 1,000 ml. containing about I00 ml. of said solution.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)
US703026A 1967-02-10 1968-02-05 Silver salt diffusions copyimg method Expired - Lifetime US3637376A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0055706 1967-02-10

Publications (1)

Publication Number Publication Date
US3637376A true US3637376A (en) 1972-01-25

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US703026A Expired - Lifetime US3637376A (en) 1967-02-10 1968-02-05 Silver salt diffusions copyimg method

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US (1) US3637376A (US07655688-20100202-C00086.png)
AT (1) AT278522B (US07655688-20100202-C00086.png)
BE (1) BE710084A (US07655688-20100202-C00086.png)
CH (1) CH498425A (US07655688-20100202-C00086.png)
FR (1) FR1555932A (US07655688-20100202-C00086.png)
GB (1) GB1220227A (US07655688-20100202-C00086.png)
NL (1) NL6801333A (US07655688-20100202-C00086.png)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352014A (en) * 1941-07-21 1944-06-20 Rott Andre Photomechanical printing process and printing material for carrying out the same
US2495112A (en) * 1946-11-08 1950-01-17 Polaroid Corp Self-developing magazine and film unit
US2686717A (en) * 1949-04-16 1954-08-17 Polaroid Corp Photographic product comprising a sheet support and means for collecting liquid spread upon said support in excess of that required to cover a predetermined area of the support
US3450535A (en) * 1962-01-25 1969-06-17 Lumoprint Zindler Kg Diffusion transfer receiving layer with high soda content
US3510301A (en) * 1965-11-17 1970-05-05 Lumoprint Zindler Kg Silver salt diffusion transfer method
US3510302A (en) * 1966-02-10 1970-05-05 Walter Limberger Transfer method for silver salt diffusion and liquid agent for use in this method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352014A (en) * 1941-07-21 1944-06-20 Rott Andre Photomechanical printing process and printing material for carrying out the same
US2495112A (en) * 1946-11-08 1950-01-17 Polaroid Corp Self-developing magazine and film unit
US2686717A (en) * 1949-04-16 1954-08-17 Polaroid Corp Photographic product comprising a sheet support and means for collecting liquid spread upon said support in excess of that required to cover a predetermined area of the support
US3450535A (en) * 1962-01-25 1969-06-17 Lumoprint Zindler Kg Diffusion transfer receiving layer with high soda content
US3510301A (en) * 1965-11-17 1970-05-05 Lumoprint Zindler Kg Silver salt diffusion transfer method
US3510302A (en) * 1966-02-10 1970-05-05 Walter Limberger Transfer method for silver salt diffusion and liquid agent for use in this method

Also Published As

Publication number Publication date
BE710084A (US07655688-20100202-C00086.png) 1968-05-30
DE1572113A1 (de) 1970-01-02
FR1555932A (US07655688-20100202-C00086.png) 1969-01-31
CH498425A (de) 1970-10-31
AT278522B (de) 1970-02-10
NL6801333A (US07655688-20100202-C00086.png) 1968-08-12
GB1220227A (en) 1971-01-20

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