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
• • 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
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
  • G03C1/34—Fog-inhibitors; Stabilisers; Agents inhibiting latent image regression
  • G03C1/346—Organic derivatives of bivalent sulfur, selenium or tellurium

Definitions

• R represents an alkyl group, an aralkyl group or an aryl group
• R and R" each represents a hydrogen atom or an alkyl group, wherein said R' and R" may form a condensed ring and wherein said condensed ring may be substituted by an alkyl group
• an imidazole compound represented by the following formula:
• R R R and R each represents a hydrogen atom, an alkyl group, a hydroxyl group, or an alkenyl group.
• This invention relates to a process of low contrast development and more particularly, it relates to a process of low contrast development for silver halide photographic light-sensitive materials.
• microfilms are commercially avail able but since such materials are among the so-called high contrast films having high gamma characteristics, they are unsuitable for recording tonal scenery although they are excellent in resolving power and granularity.
• a developing solution containing l-phenyl-3-pyrazoli done developing agent can soften high contrast photographic film but it is accompanied by low sensitivity and is very easily exhausted by processing a small quantity of films.
• a developing solution containing N-methyl-p-aminophenol developing agent may have a high sensitivity but it is not effective for obtaining a soft-tone image.
• a developing solution containing a suitable amount of l-phenyl-3-pyrazolidone and N-methylp-aminophenol may have a high sensitivity and can give a considerably soft-tone image but is easily exhausted.
• a developing solution containing a suitable amount of 1-phenyl-3-pyrazolidone, N-methyl-p-aminophenol and hydroquinone developing agent may have a high sensitivity and is not easily exhausted but it is impossible to obtain good soft-tone images by using such a developing solution.
• a developing solution giving a high sensitivity, having a good resistance to exhaustion and which is capable of producing soft-tone images may have a high sensitivity and is not easily exhausted but it is impossible to obtain good soft-tone images by using such a developing solution.
• An object of this invention is to provide a process of enlarging the exposure latitude by low contrast development and varying widely the characteristics of a silver halide hard-tone light-sensitive material without lowering the granularity and resolving power of the light-sensitive material.
• R represents an alkyl group, an aralkyl group such as a benzyl group or an aryl group, and R and R" each represents a hydrogen atom or an alkyl group; wherein said R and R" may form a condensed ring and further said condensed ring may be substituted with an alkyl group;
• R R R and R each represents a hydrogen atom, an alkyl group, a hydroxyalkyl group or an alkenyl group.
• the alkyl group described preferably contains from 1 to 5 carbon atoms.
• Compound 1-6 Compound 1-7 4 11-1 3-4-( Z-hydroxyethyl -5-methylimidazole, II14-1-allyl-2-methylimidazole, IL-15-1-vinyl2-methylimidazole, etc.
• the thiazole derivatives represented by General Formula I give less loss of speed and more remarkable softening effects as compared with other conventional organic antifoggants.
• the low contrast development by these thiazole derivatives is still accompanied by some loss of speed.
• An improvement of low contrast development with an improved speed will, therefore, be advantageous for many fields of application.
• a development accelerator such as an amine compound or a polyethylene oxide is known but the use of such an accelerator is not preferable since the com pound tends to increase the contrast of the processed image.
• the imidazole derivatives represented by the above-mentioned General Formula'II show excellent development accelerating effects (Japanese patent application No. 5,126/ 1969). That is to say, when the imidazole derivative represented by General Formula II is incorporated in a developing solution containing 1 phenyl-3-pyrazolidone and hydroquinone or N-methyl-p-aminophenol and hydroquinone, the speed is increased, the developing period is shortened, and the gamma is increased to some extent.
• an aqueous solution containing at least one developing agent such as hydroqinone, 1-phenyl-3-pyrazolidone, N-methyl-p-aminophenol, and the like.
• the aqueous solution usually contains an anti oxidant such as sodium sulfite, ascorbic acid, etc; a pH- controlling agent such as boric acid, borax, sodium hydroxide, sodium carbonate, trisodium ortho-phosphate, etc.; a salt such as sodium sulfate, etc., and a butter agent.
• potassium bromide or potassium iodide may be added to the developing solution together with the above additives.
• an organic antifoggant may also be added to the developing solution.
• an aldehyde such as formalin, glutaraldehyde etc., with an organic solvent such as triethylene glycol, hexylene glycol, etc., may be used.
• the concentration of the aforesaid compounds of this invention depends upon the composition of the developing solution used, the developing temperature, and the nature of the light-sensitive material to be processed but generally, the thiazole derivative is used in a range of from 1 mg. to 10 g. per liter of the developing solution and the irnidazole derivative is used in a range of from 10 mg. to g. per liter of the developing solution.
• the compounds of this invention are elfective not only in the case where they are incorporated in a developing solution but also in the case where they are incorporated in the photographic emulsion layer of a light-sensitive material to be processed.
• the above explanation describes adding the compounds to a developing solution, the use of such compounds is not limited to only this embodiment.
• EXAMPLE 1 A microfilm prepared by coating a fine grain silver chlorobromide gelatin emulsion on a support was exposed by means of a sensitometer and developed by one of the following three kinds of developing solutions A, B and C.
• Developing solution A is an ordinary high contrast developing solution
• developing solution B is a known soft-tone developing solution
• developing solution C is the low contrast developing solution of this invention.
• EXAMPLE 2 A microfilm prepared by coating a fine grain silver chlorobromide gelatin emulsion on a support was exposed by means of a sensitometer and then developed in developing solution D having the composition shown below at 27 C. For the sake of comparison, the same development was conducted by using developing solution F having the same composition except that Compound II-3 was omitted or solution B having the same composition except that Compound I-5 and Compound II-3 were omitted.
• EXAMPLE 4 A microfilm prepared by coating a fine grain silver chlorobromide gelatin emulsion onto a support was exposed by means of a sensitometer and then developed in developing solution I, having the same composition as developing solution D except that 4.0 g. of compound II-l was used instead of the compound 11-3; developing solution I having the same composition as developing solution D except that 4.0 g. of compound II2 was used instead of the compound II-3; developing solution K having the same composition as developing solution D except that 4.0 g. of compound II6 was used instead of compound II3; or developing solution L having the same composition as developing solution D except that 4.0 g. of compound II-7 was used instead of compound 'II-3; all at 27 C.
• Photographic characteristics Gamma v The value of the sensitivity was shown by the logarithmic sensitivity when the sensitivity obtained by using developing solution E in example 2 was assumed to be 1.00.
• a developing process for silver halide photographic light-sensitive materials which comprises developing the exposed photographic materials in the presence of a thiazole compound represented by the following formula:
• R R R and R each represents a hydrogen atom, an alkyl group, a hydroxyl group, or an alkenyl group.
• said developing solution contains as the developing agent at least one of the developers l-phenyl-3-pyrazolidone and N- methyl-p-amino-phenol sulfate.
• said imidazole compound is selected from the group consisting of imidazole, l-methylimidazole, Z-methylimidazole, 4- methylimidazole, Z-ethyli-midazole, 2,4-dimethylimidazole, 2-ethyl-4-methylimidazo1e, 2-amylimidazole, l-isoamyl-Z- methylimidazole, 4,5-dimethylimidaz0le, 2,4,5-trimethylimidazole, 4-hydroxymethyl-S-methylimidazole, 4-(2-hydroxyethyl)-5-methylimidazole, 1-al1yl-2-methylimidazole, and 1-vinyl-2rnethylimidazole.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Plural Heterocyclic Compounds (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=11731307

Family Applications (1)

Country Status (5)

Cited By (3)

Families Citing this family (1)

• 1970
  • 1970-02-04 JP JP45009840A patent/JPS4912663B1/ja active Pending
• 1971
  • 1971-02-03 DE DE19712105042 patent/DE2105042A1/de active Pending
  • 1971-02-03 FR FR7103635A patent/FR2078153A5/fr not_active Expired
  • 1971-02-04 US US112825A patent/US3687669A/en not_active Expired - Lifetime
  • 1971-04-19 GB GB21347/71A patent/GB1298542A/en not_active Expired

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