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
  • Y10S430/135—Cine film
• • 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
  • Y10S430/162—Protective or antiabrasion layer

Definitions

• This invention relates to the processing of silver halide photographic materials and more particularly to developing solution for fine grained photographic materials.
• the well known development accelerators are amine compounds, such as alkylamines (U.S. Pat. No. 2,196,037), aralkylamines (U.S. Pat. No. 2,496,903; 2,515,147; 2,541,889), phenoxyalkylamines (U.S. Patent No. 2,482,546), heterocyclic alkylamines (U.S. Pat. 2,605,183), morpholine and piperidine (U.S. Pat. No. 1,086,681).
• alkylamines U.S. Pat. No. 2,196,037
• aralkylamines U.S. Pat. No. 2,496,903; 2,515,147; 2,541,889
• phenoxyalkylamines U.S. Patent No. 2,482,546
• heterocyclic alkylamines U.S. Pat. 2,605,183
• morpholine and piperidine U.S. Pat. No. 1,086,681.
• the principal object of this invention is to provide an improved accelerator for the developing solution, which is easily handled, capable of increasing the rate of development and increasing the effective speed of the photographic material without undesirable increase in fog and the deterioration in the granularity of the developed silver.
• Still another object of this invention is to provide a process for accelerating the developing of the fine grained photographic materials without deterioration in the granularity of the developed silver.
• the developing solution of this invention is applied to the black-and-white photographic materials, especially to low sensitivity silver halide photographic materials which require fine granularity and is generally used for the oflice works, documentary works, industrial works, or reprographic works.
• the present invention can be applied to telephotographic materials; lithographic materials (used for producing dots), phototypesetting materials, microfilms, microplates, materials for facsimile, materials for prints of scanned dots, materials for production of integral circuit master and photographic materials for astronomical study; these photographic materials are composed of extremely fine grained silver halide and contain very small amounts of silver halide.
• the granularity of the developed silver image should be adequately low throughout the development in the development of, e.g., fine grain silver halide emulsions as in the developing acceleration of this invention.
• the present invention provides a method of treating a photographic material which comprise developing the materials with the developer containing imidazole and hydroquinone (substituted or unsubstituted) thus increasing the rate of development or shortening the developing time, inhibiting the fog formation, increasing the effective sensitivity and making fine the developed silver particles.
• the increase in speed of the black-and-white photographic material to which this invention is applied by the imidazole is much greater than that of the reversible color film described in the U.S. lPat. 3,126,282.
• the reversible color film of this is considered to be composed of an emulsion of coarse silver iodobromide particles, while the emulsion of the Black and White photographic materials used in this invention contains finely divided silver halide particles.
• the process for developing the photographic material containing fine grain silver halides according to this invention has been made on a discovery that the increase in speed by an imidazole depends on the size of the silver halide grain.
• fine grained denotes a particle size of from 0.1 to 0.3 micron.
• the developing solution exhibiting the aforesaid advantageous effects with the addition of the imidizole contains at least 120 parts/liter hydroquinone as the main developing agent and, in addition, a conventional developer such as 1-phenyl-3-pyrazolidone or N-methyl-paminophenol.
• an oxidation inhibitor such as Na sulfite or ascorbic acid
• a suitable pH buffer such as boric acid, sodium hydroxide, sodium carbonate or sodium phosphate
• a developing inhibitor such as potassium iodide or potassium bromide
• an organic fog inhibitor such as 6-nitro-benzimidazole or benzotriazole
• an aldehyde such as formaldehyde or glutaraldehyde
• the pH of this developing solution may be adjusted in a range between 8.5 and 12.0 and preferably 10 to 11.
• the amounts of the imidazole to be added to the developing solution vary with the type of the photographic material employed and the pH of the developing solution, but favorably in the range of between 0.5 part/liter and parts/liter.
• the finely divided silver halide is present in a concentration of from 10-70 mg./100 cm. and preferably 20-50 mg./crn.
• the process of this invention was not effective for the Benzylalcohol VOL)" films (I)-(IV), but the test results were shown to be Sodium sulfite 30 compared with those of the films (V)(VII).
• the mean Sodium carbonate 4L0 diameter of the silver halide grains in each of the photo- Sodium hydroxide L0 graphlc films were as follows: 4-amino 3 methyl-N-ethyl-N-methane sulfon- Mean diameter of the amidethylaniline sulfate 5.0 Photographic film: silver particle, microns Potassium bromide 0.5
• EXAMPLE 2 Commercial fine grain positive film for the cinematography composed of grained silver bromochloride-gelatinemulsion was subjected to development with solution having following composition at 27 C.
• Developing solution C Parts Water (by vol.) 800 l-phenyl-B-pyrazolidone 0.5 Sodium sulfite 50 Hydroquinone 12 Sodium carbonate (NaCO H O) 60 Potassium bromide 2.0 Benzotriazole 0.2 Water to make 1 liter.
• microfilm comprising a support with a fine grain silver chlorobromide, gelatin emulsion coated thereon, was subjected to development at 20 C. with a developing solution having following composition.
• the developing solution of E required 4 minutes to develop the microfilm, but the addition of the imidazole to the developing solution shortened the developing time as shown in Table 3. On the other hand, a development time of 4 minutes with the imidazole added to the developing solution produced a high sensitivity on the microfilm. Furthermore, the developed silver grains in the picture were favorably fine and uniform according to the process of this invention using the imidazole containing developing solution.
• a method for processing an exposed silver halide black-and-white photographic material, wherein the silver halide grains are less than 0.3 micron which comprises developing the photographic material with a developing solution comprising at least 1.0 part of hydroquinone as the main developing agent and at least 0.5 part of imidazole per one liter of the developing solution.

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

Applications Claiming Priority (1)

Publications (1)

Family

ID=13721115

Family Applications (1)

Country Status (5)

Cited By (4)

Families Citing this family (1)

• 1969
  • 1969-10-08 JP JP44080538A patent/JPS4828295B1/ja active Pending
• 1970
  • 1970-10-07 FR FR7036141A patent/FR2065100A5/fr not_active Expired
  • 1970-10-07 GB GB47751/70A patent/GB1275375A/en not_active Expired
  • 1970-10-08 US US00079335A patent/US3708299A/en not_active Expired - Lifetime
  • 1970-10-08 DE DE19702049502 patent/DE2049502A1/de active Pending

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