Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
  • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
  • C07D487/04—Ortho-condensed systems
• • 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 and R which may be the same or different, represent a hydrogen atom, a hydroxyl group, a hydrocarbon group or -SR,-,; at least one of said R and R being -SR R represents a hydrogen atom or an alkyl radical; and R and R, which may be the same or different, represent a hydrogen atom, a hydroxyl group, a halogen atom, or a hydrocarbon group; said R and R may be ring-closed to form a 5- or 6-membered ring.
• the present invention relates to a process for developing a silver halide photographic element for printing plate and more particularly the invention relates to a developing process having a wide developing latitude and giving images having good quality.
• lith-type light-sensitive materials include a lith plate (lithographic plate) or lith film (lithographic film).
• the original picture consisting of a continuous tone image is recorded on these materials with a continuous regularly distributed crowd of dots, namely, the continuous tone image is converted to a divided discontinuous dot image. In this process the density variation of the original is changed to a dot size variation.
• the other group of lithographic materials include lith line plate (lithographic line dry plate) or lith line film (lithographic line film) for recording line image.
• photographic plates for prinitng Furthermore, at the development of such photographic silver halide element for printing plates (hereinafter referred to as photographic plates for prinitng), the control of the developing period of time is an important problem.
• a photographic plate for printing has a feature that the latitude of the developing time thereof for obtaining the optimum dot qualities is quite narrow. Particularly, if a developing period of time is prolonged, the qualities of dots are degraded. It is an important theme in the development of the photographic plate for printing to overcome such difiiculties and widen the latitude of the optimum developing time.
• An object of this invention is to provide a developing process for lithographic materials, which can reduce fringe and can improve latitude of development.
• R and R which may be the same or different, represent a hydrogen atom, a hydroxyl group, a hydrocarbon group or -SR at least one of said R and R being SR R represents a hydrogen atom or an alkyl group, and R and R.,, which may be the same or different,
• Compound 2 fi-methyl-l,3,3a,7-tetraazaindene-4-thiol.
• Compound 6 G-undecyl-l,3,3a,7-tetraazatndeno-4'thiol.
• Compound 7 6-heptadecyl-l,3,3a,7-tetraazindene-4-thiol.
• Compound 10 2, fi-dlmethyl-l, 3, 3a, 7-tctraazulndoneA-thlol.
• Compound 12 fi-iso-butyl-G-mothyl-l, 3, 3a, 7-tetraazaindene-4thiol1 I SH Compound 13: 2-benzyl-6-methyl-l, 3, 3a, 7-tetraazaindenet-thiol.
• Compound 14 2-mcthyltl1io-4-hydroxy-61nothyl-1,3,3a,7-totraazaindeno.
• the Compounds 1-8 may be prepared by reacting 3-amino-1,2,4-triazole with corresponding acylacetic acid esters, followed by chlorination of the products by phosphorus oxychloride then reacting the products with thiourea.
• the Compound 9 may be obtained by bromination of the Compound 2 in acetic acid.
• the Compounds 14-17 may be obtained by the coudensation reaction of 3-amino-5-methylthio-1,2,4-triazole and corresponding ketoesters or diethyl malonate (Compound 15).
• the amount of the compound used in this invention is varied according to the composition of the developing solution and the nature of the emulsion to be employed, but in case of incorporating the compound in the developing solution, it is preferable that the amount of the compound b from 1 10- mol to 1 10- mol per liter of the developing solution, and in case of incorporating it in the silver halide emulsion, it is preferable that the amount of it be in a range of from 1 10 mol to 1 10 mol per mol of the silver halide.
• the developing solution for lithographic materials ordinarily contains hydroquinone as a developing agent
• the developing solution may sometimes contain a softener for hard water, an organic solvent, a polyalkylene oxide compound, ascorbic acid, etc.
• the emulsion used for the photographic plate for printing is an ordinary silver halide photographic emulsion and a silver chloride emulsion, a silver bromide emulsion, a silver chlorobromide emulsion, a silver iodobromide emulsion, and a silver chloroiodobromide emulsion are employed, although the silver chlorobromide is particularly preferable.
• a silver halide emulsion is prepared by dispersing the silver halide in a medium, such as gelatin or a mixture of gelatin and a synthetic polymer.
• the silver halide emulsion may be sensitized chemically by ammonium thiosulfate, sodium thiosulfate, or allylthiourea; a gold compound, such as a complex salt of a monovalent gold and thiocyanic acid; or a combination of them.
• the silver halide emulsion may be optically sensitized by adding thereto a spectral sensitizer such as a cyanine dye, merocyanine dye and the like.
• the silver halide emulsion may contain a heterocyclic compound, such as benzotriazole or a polyalkylene oxide compound, an amine compound, and further may contain' a hardening agent such as formaldehyde or mucochloric acid. Furthermore, the silver halide emulsion may contain a surface active agent such as saponine for facilitating the coating operation.
• a heterocyclic compound such as benzotriazole or a polyalkylene oxide compound, an amine compound
• a hardening agent such as formaldehyde or mucochloric acid.
• the silver halide emulsion may contain a surface active agent such as saponine for facilitating the coating operation.
• the compound may be incorporated in the silver halide emulsion at any stage during the preparation of the photographic emulsion, but the most preferable results are obtained by adding the compound at a stage after the postripening and before coating.
• the compound may be added as a solution thereof in an organic solvent, such as methanol, ethanol, acetone, etc.
• the compound may of course be incorporated directly in the silver halide emulsion but may be incorporated in an adjacent layer of the silver halide emulsion layer such as a protective layer to diifuse the compound into the silver halide emulsion layer from the protective layer.
• EXAMPLE 1 A commercially available lithographic film was exposed by a sensitometer using an optical wedge attached with a magenta contact screen of 150 lines and then developed for 2-5 minutes at 20 C. in the developing solution prepared from the two kinds of the concentrated liquids having the following formulas:
• Distilled water (50 C.) cc 100 Sodium sulfite g 2 Sodium carbonate (monohydrate) g 30 Sodium hydroxide g 5 Boric acid g 5 Sodium bromide g 2 Distilled water to make 125 cc.
• the liquid A was first added to 750 cc. of water and then the liquid B was added to the mixture so that the whole volume of the final solution became 1,000 cc.
• the widths of the fringes around the dots were measured by tracing the dots of 20% in dot area ratio by means of a microdensitometer.
• EXAMPLE 2 A commercial lithographic film was exposed with a sensitometer through an optical wedge for sensitometry attached with a magenta contact screen of 150 lines and then developed for 2-5 minutes at 20 C. in the developer prepared by mixing the two kinds of the concentrated liquids having the following composition:
• Distilled water (50 C.) cc 50 Diethylene glycol cc 15 'Methyl Cellosolve cc 15 Formaldehyde-potassium bisulfite addition product g 45 Hydroquinone g 16 L-ascorbic acid g 1 Distilled water to make 125 cc.
• the liquid A was added to 750 cc. of water and then the liquid B was added to the mixture so that the whole volume of the resultant developer became 1,000 cc.
• the widths of the fringes around the dots of each of the two samples thus developed were measured by tracing the dots of 20% in dot area ratio by means of a microdensitometer.
• EXAMPLE 3 A commercially available lithographic film was used to take a photograph of an optical wedge for sensitometry through contact screen of 150 lines magenta and then developed for 2-5 minutes at 20 C. in the developer having the following composition:
• the widths of the fringes around the dots of the samples thus developed were measured by tracing the dots of 20% in dot area ratio by means of microdensitometer.
• the widths of the fringes around the dots of each sample were measured by tracing the dots of 20% in dot area ratio by means of a microdensitometer.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (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)

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Cited By (7)

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• 1970
  • 1970-06-11 JP JP45050564A patent/JPS503170B1/ja active Pending
• 1971
  • 1971-06-08 FR FR7120685A patent/FR2096049A5/fr not_active Expired
  • 1971-06-08 DE DE19712128498 patent/DE2128498A1/de active Pending
  • 1971-06-10 GB GB1994971*[A patent/GB1312864A/en not_active Expired
  • 1971-06-11 US US00152397A patent/US3782945A/en not_active Expired - Lifetime

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