Classifications

• • 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
  • G03C8/42—Structural details
  • G03C8/52—Bases or auxiliary layers; Substances therefor

Definitions

• the conversion is effected by the catalytic action of the development nuclei present in the receiving or silver precipitating layer.
• These nuclei consist of finely divided metal or metal sulfide. In this way, an image is formed in the receiving layer, which image becomes visible after the separation of the image-receiving material'from the light-sensitive material.
• German patent specification 869,008 that the separation of emulsion and receiving layers is facilitated by wholly or partly replacing the gelatin in at least one of these layers with other layer-forming substances such as cellulose derivatives, polyamides, polyesters, polyvinyl alcohols, polyvinyl acetates, partially hydrolized polyvinyl acetates, polyvinyl acetals, or other synthetic or natural resins.
• layer-forming substances such as cellulose derivatives, polyamides, polyesters, polyvinyl alcohols, polyvinyl acetates, partially hydrolized polyvinyl acetates, polyvinyl acetals, or other synthetic or natural resins.
• Another method of facilitating the separation of the emulsion layer from the image-receiving layer consists in applying a thin auxiliary layer onto the emulsion layer and/or onto the image-receiving layer. It is known, as shown in the German patent specification 1,055,953 that starch or starch derivatives can be used for this purpose.
• the image-receiving material comprises successively a support, a gelatin image-receiving layer containing development nuclei and an alginate surface layer, the former layer being hardened in situ by a hardening agent for gelatin present in the coating composition of the alginate layer, and the latter layer being insolubilised in situ by a suitable Water-soluble metal salt present in the coating composition of the image-receiving layer.
• Any water-soluble metal salt which forms a water-insoluble compound with the alginate can be used.
• Suitable metal salts are the water-soluble salts of calcium, strontium, barium, cerium, uranium, titanium; chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, cadmium, mercury, aluminium, thallium and lead. These water-soluble metal salts are incorporated into the coating composition of the image-receiving layer.
• the amounts of added metal salts may vary widely but are preferably chosen between 5 and 20 g. per litre of coating composition for the image-receiving layer.
• the alginate used for coating. the surface layer is soluble in water. Its molecular weight may vary between 18,000 and 200,000. Suitable alginates for this purpose are e.g. sodium alginate, potassium alginate, ammonium alginate, magnesium alginate and triethanolamine alginate. They are used in aqueous solutions in concentrations which may vary between 5 and g. per litre of coating composition. These amounts, however, are not at all critical, and if it is convenient may be varied outside these limits.
• the said adhesion seems likewise to be improved very considerably by applying the alginate layer at a relatively high temperature, viz, between 60 and C.
• An important advantage in the use of the image-receiving material according to this invention is the greater range of manipulation conferred to the silver salt diffusion transfer process. Indeed, due tothe short contact times of light-sensitive material and image-receiving material, the same light-sensitive material can successfully be used for the manufacture of a second, a third, etc., diffusion transfer print. Also for use in developing apparatus that operates at a developing speed of 7.5 cm./sec., the quick bath treatment can now be coupled with a quick separation of the light-sensitive and image receiving materials so that the diffusion transfer process is speeded up considerably. Moreover, due to the strongly improved mutual adhesive properties, the image-receiving material can be separated from the light-sensitive material after a long contact time and even after complete drying Without the risk of tearing these materials.
• silver halide emulsion can be used in the process of this invention, except only that its exposed silver salt is sufficiently rapidly developed during the diffusion transfer process and its non-exposed silver salt is sufficiently rapidly complexed.
• silver chloride emulsions which may contain silver bromide or silver iodide, or to which other ingredients have been added, so as to impart the desired emulsion characteristics, are preferably used.
• the image-receiving layer is a gelatin layer containing development nuclei.
• Development nuclei for complexed silver halides suitable for obtaining the silver-containing image in the image receiving layer are the sulphides of heavy metals such as, e.g., of antimony, bismuth, cadmium, cobalt, lead, nickel, silver and Zinc.
• Selenides, polysulfides, polyselenides, mercaptans, tin (II) halides, heavy metals or their salts and fogged silver halides are also suitable for this purpose.
• the complex salts of lead sulfide and zinc sulfide are effective either in themselves or mixed with thioacetamide, dithiobiuret and dithio-oxamide.
• thioacetamide, dithiobiuret and dithio-oxamide are particularly worthy of mention, especially in their collodial form.
• the precious metals among them are the most active.
• the composition of the developing solution for the silver halide is that of the conventional developing solution for the silver complex diffusion transfer: it contains the necessary ingredients for the development of the exposed silver halide such as hydroquinone and 1-phenyl-3-pyrazolidone and sometimes a solvent for the undeveloped silver halide, e.g., sodium thiosulphate, sodium thiocyanate or ammonia.
• a solvent for the undeveloped silver halide e.g., sodium thiosulphate, sodium thiocyanate or ammonia.
• the solvent for silver halide may, of course, be present in the image-receiving material as well as in the developer.
• composition of the silver halide emulsion layer the image-receiving material and the baths, and for the exposing and developing apparatus are given in the last cited literature and to the patent specifications mentioned therein.
• Example 1 A 90 g./sq. m. paper support is coated with an imagereceiving layer from a 40 C. warm suspension of the following composition:
• This suspension is cast in such a way that 1 1. thereof covers 40 sq. m. of paper.
• a second layer is applied from the following solution at 60 C.:
• the image-receiving material thus obtained is together with an image-wise exposed light-sensitive material, comprising a silver halide emulsion layer in the usual way conducted through a developing bath of the following composition:
• Example 2 The same favorable results as in Example 1 can be attained when in the suspension of Example 1 the strontium chloride is replaced by calcium chloride.
• Example 3 A g./sq. in. paper support is coated with a receiving layer as described in Example 1. After drying a second layer is applied thereon from the following solution at 60 C.:
• the image-receiving material is conducted through a developing bath together with an image-wise exposed silver halide material such as described in Example 1. After leaving the squeezing rollers of the developing apparatus the image-receiving and light-sensitive materials are dried occasionally by means of heat and finally separated from each other, A positive image of the original is obtained in the receiving material.
• An image-receiving material for use in the silver complex diffusion transfer process comprising successively a support, a gelatin image-receiving layer containing development nuclei and an alginate surface layer, the former layer being hardened in situ by a hardening agent for gelatin present in the coating composition of the alginate layer, and the latter layer being insolubilised in situ by a suitable water-soluble metal salt present in the coating composition of the image-receiving layer.
• hardening agent for gelatin is formaldehyde
• water-soluble metal salt for the insolubilisation of the alginate surface layer is selected from the group consisting of water-soluble calcium and strontium salts.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Structural Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Photosensitive Polymer And Photoresist Processing (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19752641

Family Applications (1)

Country Status (8)

Cited By (4)

Families Citing this family (2)

Citations (4)

Family Cites Families (1)

• 0
  • BE BE609394D patent/BE609394A/xx unknown
  • NL NL108971D patent/NL108971C/xx active
  • NL NL257057D patent/NL257057A/xx unknown
• 1961
  • 1961-10-14 SE SE10201/61A patent/SE318188B/xx unknown
  • 1961-10-18 ES ES271324A patent/ES271324A1/es not_active Expired
  • 1961-10-18 CH CH1203861A patent/CH416321A/de unknown
  • 1961-10-19 GB GB37615/61A patent/GB998956A/en not_active Expired
  • 1961-10-19 DE DEG33381A patent/DE1155334B/de active Pending
• 1966
  • 1966-04-06 US US540510A patent/US3351469A/en not_active Expired - Lifetime

Patent Citations (4)

Also Published As

Similar Documents