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
  • G03C5/29—Development processes or agents therefor
  • G03C5/305—Additives other than developers
• • 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
  • Y10S430/167—X-ray

Definitions

• ABSTRACT A photographic developer solution for manual processing of photographic [radiographic] film said solution comprising from about 10 to 30 grams per liter of hydroquinone, from about 0.3 to 0.9 grams per liter of phenidone, and further comprising a source of thiosulfate ion in an amount equivalent to from about 0.1 to 1.0 grams per liter of sodium thiosulfate.
• the present invention relates to liquid photographic developer compositions and particularly to such compositions useful for developing radiographic films of the type designed for automatic machine processing.
• Certain presently-available photographic films are designed for rapid (e.g., 90 seconds or less) machine processing. Such processing normally employs temperatures in the range of 35C, and utilizes speciallyformulated radiographic film characterized by containing a comparatively small quantity of silver (such as 9.0 grams per square meter) and by a comparatively high silver/gelatin ratio, which may often be higher than 1.2. Reduced quantities of gelatin permit rapid drying of radiographic film.
• Machine processing e.g., machine development
• Liquid developers normally employed in machine processing include hydroquinone and phenidone as developing agents, an antioxidant such as an alkali sulfite (e.g., sodium sulfite), a development inhibitor such as an alkali bromide, an alkalizing agent for raising pH, such alkali metal and ammonium hydroxides or sodium carbonate, etc., a pH controlling agent such as an alkali metal metaborate or tetraborate, and an organic foginhibiting agent such as benzotriazole, S-methylbenzotriazole, 6-nitro-benzimidazole and l-phenyl-- mercaptotetrazole, etc.
• an antioxidant such as an alkali sulfite (e.g., sodium sulfite)
• a development inhibitor such as an alkali bromide
• an alkalizing agent for raising pH such alkali metal and ammonium hydroxides or sodium carbonate
• a pH controlling agent such as an alkali metal meta
• compositions ordinarily also include an anticalcium substance such as an alkali polyphosphate, or alkali salts of the ethylenediaminotetraacetic acid type.
• an anticalcium substance such as an alkali polyphosphate, or alkali salts of the ethylenediaminotetraacetic acid type.
• Such developers can be, if de-, sired, marketed as concentrated liquids to be diluted prior to use, for example, in a one-fourth or one-fifth ratio.
• liquid developer components can be divided into several, separately packaged portions. For example, in one instance it may be desirable to divide the liquid developer into two concentrated portions, one acidic in nature and the other basic in nature. Such portions, when mixed and diluted, will provide a developing solution ready for use (working solution).
• the portion which is basic in nature will have a pH normally higher than the intended working solution, and may tolerate a high concentration of hydroquinone-if desired.
• Phenidone can be included in the alkaline portion, in the acid portion, or can be divided between the two portions.
• the basic portion may include the pH control agent and antioxidant
• the acid portion may include the develop ment inhibitor and fog inhibitor.
• hydroquinone and phenidone components of the above-described liquid photographic developers are ordinarily used within concentration limits known to the art.
• hydroquinone is employed in amounts ranging from about 10 to about 30 grams per liter
• phenidone is employed in amounts ranging from about 0.3.to about 0.9 grams per liter.
• the pH of such liquid developers is ordinarily in the range of from about 10 to about 11 (preferably 10.2 to 10.5), and may be regulated by use of an alkalizing agent.
• hydroquinone/phenidone liquid developer compositions of the type hereinabovedescribed may be modified so as to permit excellent results to be obtained in manual development of machineprocessable radiographic films.
• the modification comprises incorporating into such liquid developers a source of thiosulfate ions in an amount-equivalent, in thiosulfate ions, to from about 0.1 to about 1.0 grams per liter of sodium thiosulfate.
• the present invention relates to a liquid photographic developer having a pH of from about 10 to about 1 1 (preferably from about 10.2 to about 10.5) and comprising from about 10 to about 30 grams per liter of hydroquinone and about 0.3 to about 0.9 grams per liter of phenidone, the developer being characterized by including a source of thiosulfate ions in an amount equivalent, in thiosulfate ions, to from about 0.1 to about 1.0 grams per liter of sodium thiosulfate.
• the liquid photographic developers of the present invention may, of course, Contain the various developer additives as previously exemplified, and may be packaged as concentrates as exemplified above.
• the optimum amount of thiosulfate which is added to hydroquinone/phenidone liquid developers to form the developers of the invention may vary according to the type of developer which is used and the type of radiographic material which is developed, and this amount can be easily determined by the skilled artisan. it has been found, however, that the amount of the source of thiosulfate ions can vary only within certain predetermined limits; these limits corresponding to thiosulfate ions in an amount equivalent to from about 0.1 to about 1.0 grams of sodium thiosulfate per liter of working solution.
• EXAMPLE 1 A medical radiographic film, suitable for rapid machine processing (Minnesota Mining and Manufacturing Company Medical X-Ray film type R) comprising a silver bromoiodide emulsion with about 9 g of silver per square meter and a silver/gelatin ratio of 1.80 was radiographically exposed and then divided into three portions.
• Minnesota Mining and Manufacturing Company Medical X-Ray film type R comprising a silver bromoiodide emulsion with about 9 g of silver per square meter and a silver/gelatin ratio of 1.80 was radiographically exposed and then divided into three portions.
• the first portion was processed by machine using a processing cycle of 90 seconds at 33C (a Kodak X- OMAT M6-RP X-Ray Processor) comprising as development solution the Kodak RP Medical X-OMAT Deve1oper-Replenisher type MX 810.
• the second portion was processed in a manual processing cycle of 3.5 at 20C using a development bath obtained by dilution of a concentrated liquid development composition consisting of two parts, A and B with the following relative composition:
• solution C The working" development solution was obtained by dilution of 250 cc of part A with 750 cc of common water and adding 20 cc of part B in order to obtain a final pH of 10.35.
• the third part of the film was processed in a manual processing cycle of 3.5, wholly equivalent to the pre- 4 ceding cycle, except that the processing bath included sodium thiosulfate present in part A of the concentrated liquid development composition in amount of
• the results obtained are given in the following table.
• the first part was processed by machine in Kodak X-OMAT M6-RP X-Ray Processor in a processing cycle of 90 seconds-employing the development bath Kodak RP Medical X-OMAT Developer-Replenisher Type MX810 of Eastman Koda.
• the second part was processed in a manual processing cycle comprising'a development bath wholly analogous to solution C of Example l but containing, according to the present invention, 0.5050 g of sodium thiosulfate per liter of solution.
• a liquid photographic developer having a pH of from about 10 to about 1 l and comprising about 10 to about 30 grams per liter of hydroquinone and from about 0.3 to about 0.9 grams per liter of phenidone, said developer further comprising a source of thiosulfate ions in an amount equivalent, in thiosulfate ion, to from about 0.1 to about 1.0 grams per liter of sodium thiosulfate.
• liquid photographic developer of claim 1 wherein said thiosulfate ion source is an alkali metal or ammonium thiosulfate.
• liquid photographic developer according to claim 1 wherein the pH of said developer is from about 10.2 to about 10.5.
• a method for the manual development of a machine processable photographic film which comprises manually treating said film in a liquid photographic developer having a pH of from about 10.0 to about 1 1.0 and comprising from about 10 to about 30 grams per liter of hydroquinone, from about 0.3 to about 0.9
• sodium thiosulfate in an amount ranging from about,
• liquid photographic developer contains ammonium thiosulfate or sodium thiosulfate as said source of thiosulfate ion.

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

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Citations (7)

• 1972
  • 1972-05-11 AU AU42180/72A patent/AU456094B2/en not_active Expired
  • 1972-05-12 FR FR7216981A patent/FR2137804B1/fr not_active Expired
  • 1972-05-15 BE BE783474A patent/BE783474A/fr not_active IP Right Cessation
  • 1972-05-15 AR AR242007A patent/AR193523A1/es active
  • 1972-05-15 US US00253428A patent/US3854948A/en not_active Expired - Lifetime

Patent Citations (8)

Non-Patent Citations (1)

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