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
  • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
  • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
  • G03C5/38—Fixing; Developing-fixing; Hardening-fixing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
  • Y10S430/164—Rapid access processing

Definitions

• the salts from the processing bath must not bridge across laps and thus cause blocking of the processed roll.
• the salts in the final bath must leave no objectionable deposit on the paper or on the drying drum.
• the bath ingredients must not cause stain on the processed paper, and the bath must be stable and give no excessive sludge upon exhaustion.
• the components should be readily available and relatively low in cost, and they should be highly soluble so that the solution can be packaged as a liquid concentrate. Moreover, the bath should give no objectionable odor upon drying (such as S fumes) and the solution should be relatively non-toxic and safe to handle.
• One object of this invention is to provide a stabilizing bath which can be used to omit the washing step following customary processing using a photographic silver halide developer and a fixing agent. Another object is to provide a rapid processing system employing a stabilizing bath which permits rapid drying of the processed photographic aper, does not cause stain on the processed paper, and is relatively free from objectionable odor and toxicity. An additional object is to provide a stabilizing bath containing a relatively high salt content, the salts of which do not bridge across laps and cause blocking of the processed roll, do not leave objectionable depositions on the photographic emulsion or on the drying drum and which give no excessive sludge upon exhaustion. A still further object is to provide a stabilizing bath having components which are readily available, relatively low in cost and which are highly soluble so that the solution can be pack-aged as a liquid concentrate.
• a solution of potassium phosphates and sulfites preferably in combination with an anti-sludging agent.
• a stabilization solution containing about 15 percent by weight of a mixture of dipotassiurn hydrogen phosphate and potassium dihydrogen phosphate, about 15 percent by weight of potassium sulfite, and about 2 percent by weight of sodium citrate.
• a well-known simple silver halide emulsion is employed, for example, which is exposed and then processed in a developer bath for about 10 seconds, in a first stop bath containing a high concentration of hypo for about 10 seconds, in a second stop bath containing :a high concentration of hypo for about 10 seconds and in a stabilizing bath as described above for about 10 seconds.
• a typical stabilizer bath is prepared, for example, as follows:
• KH PO pH 7
• K solution 20 grams sodium citrate Water is used as the solvent, but a water soluble volatile solvent such as ethyl alcohol may be added to the solution to expedite drying where the solvent is not deterimental because of vapor disposing problems.
• potassium salts are preferable, other alkaline metal salts may be substituted in part.
• the limiting factors are the required solubility, freedom from salt bridges, and freedom from drum deposits.
• the total concentration of salt in the stabilizer should be held at 30 percent or above. A lower salt content will result in corresponding slower drying rate.
• anti-sludge agents than sodium citrate may be used such as, for example, sodium tetraphosphate, potassium tartrate, etc.
• the stabilizing bath can be prepared by mixing easily available components which will react together in situ to form the above salts. For instance, phosphoric acid, sodium or potassium bisulfite and potassium hydroxide can be added to the aqueous solution in any order. The phosphate salts and the sulfite salts will then form in the stabilizing bath.
• this stabilizing bath can be used for photographic emulsions on other supports such as commonly used film bases, aluminum foil and the like.
• the term light-sensitive silver halide includes photographic emulsions known in the art as silver chloride, silver bromide, and mixed halide emulsions including iodides, etc.
• the silver halide developer used is not critical, but may be any of those known in the art.
• this stabilization system can be used to stabilize color emulsions as well as those which are used to make prints by the diffusion process, colloid transfer process and the like. It can be used where the hypo or similar fixing agent is present in the emulsion or contiguous layer, applied from .a solution, for example, in ntonobath systems, etc.
• a method of rapid processing light-sensitive silver halide emulsion comprising developing an exposed emulsion with a silver halide developer, fixing with a silver halide solvent to remove unexposed silver halide, and stabilizing by imbibing into the emulsion a stabilizing bath containing about 15-40 percent by weight of a mixture of monoand di-basic salts of phosphoric acid and about 220 percent by Weight of a sulfite salt.
• a method of rapid processing light-sensitive silver halide emulsions comprising developing an exposed emulsion with a silver halide developer, fixing with a silver halide solvent to remove unexposed silver halide and stabilizing by imbibing into the emulsion a stabilizing bat-h containing about 15-40 percent by weight of a mixture of dipotassium hydrogen phosphate and potassium dihydrogen phosphate, 2-20 percent by weight potassium sulfite, and about 3 percent by weight of an anti-sludge agent.
• a method of rapid processing light-sensitive silver halide emulsions comprising developing an exposed emulsion with a silver halide developer, fixing with a silver halide solvent to remove unexposed silver halide and stabilizing by imbibing into the emulsion a stabilizing bath containing about 1540 percent by weight of a mixture of monoand di-basic salts of phosphoric acid, 2-20 percent by weight of a sulfite salt, and about 0-3 percent by Weight of an anti-sludge agent.
• a bath for stabilization of developed and fixed photographic silver halide emulsions comprising about 37 to 83 percent by weight of an aqueous solvent, about 15 to 40 percent by weight of a mixture of dipotassium hydrogen phosphate and potassium dihydrogen phosphate, 2 to 20 percent by weight of potassium sulfite and about 0 to 3 percent by weight sodium citrate.
• a bath for stabilization of developed and fixed photographic silver halide emulsions consisting essentially of about 37 to 83 percent by Weight of an aqueous solvent, about 15 to 40 percent by weight of a mixture of monoand di-basic salts of phosphoric acid, about 2-20 percent by weight of a sulfite salt and up to about three percent of an anti-sludge agent.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)

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Publications (1)

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Citations (3)

• 0
  • CA CA700148A patent/CA700148A/en not_active Expired
• 1963
  • 1963-01-18 US US252305A patent/US3271153A/en not_active Expired - Lifetime
• 1964
  • 1964-01-15 BE BE642560A patent/BE642560A/xx unknown
  • 1964-01-20 GB GB2486/64A patent/GB1045044A/en not_active Expired

Patent Citations (3)

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