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
  • 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
  • G03C1/35—Antiplumming agents, i.e. antibronzing agents; Toners
  • G03C1/355—Organic derivatives of bivalent sulfur, selenium or tellurium
• • 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
  • Y10S430/13—Antibronze agent or process

Definitions

• One object of our invention is to provide a method of preventing plumniing of photographic silver images without decreasing the sensitivity of the silver halide emn'lsity obtained is consistently better than the correspondingmaximum density when these compoun are Omitted or when the free compounds corresponding thereto are incorporated in the emulsion layer or in coating layers adjacent to the photographic emulsion layer.
• Compounds whose silver salts are useful in products in accordance with our invention are described in U. S. Patent 2,5 3,861 o weis berg r of Ap i 1 5 he o pounds in accordance with our invention, are employed at the rate of 0.5-3 grams of silver salt per mol of silver halide contacted in accordance with our invention.
• Example 1 Finely dispersed silver chloride was prepared by adding a solution of 5.44 grams of silver nitrate in 95 ml. of water and a solution of 2.24 grams of potassium chloride in 95 ml. of water simultaneously to 200 ml. of 5% gelatin solution at 40 C. with stirring.
• the silver salt of 2-thioglycolylamidobenzothiazole was formed by mixinga solution of the sodium salt thereof (which had been prepared by dissolving 2.6 grams of 2-acetylthioglycolylarnidobenzothiazole in 14 ml. of 2.5 N. sodium hydroxide with 25 ml. of additional water) with the silver chloride preparation.
• the thus prepared silver salt was added to a gelatino-silver chloride emulsion containing about 2% silver bromide, in one case in the proportion of 0.7 gram of the silver salt of acetylthioglycolylamido'bengothiazole per mol of silver halide and in the second case in the proportion of 2.8 grams thereof per mol of silver halide in the emulsion.
• Solutions of saponin and formaldehyde were also added to each sample of emulsion and they were coated on a single weight baryta coated paper at the rate of 1 mol of silver per 1000 sq. ft.
• Another object .of our invention is to employ certain simple salts to give the antiplumming effect.
• a further object of our invention to provide antiplumming agents which may be directly ncorporated in the photographic emulsion or in layers in contact therewith without itesof. the photographic emulsion.
• Other objects of our invention will appear herein.
• the silver salt of 2-thioglycolylamidobenzothiazole and the silver salt of 2-acetylthioglycolylamidobenzothiazole are both excellent antiplummmg agents either when added to the photographic emulsion prior to applying to a support orwhen incorporated in a gelatin solution which is applied as an overcoating over the photographic emulsion layer.
• any efiect upon the proper- Our invention involves the reacting of silver nitrate
• the product was exposed, developed, fixed and washed and test strips were dried at approximately F. on a Kodak gloss print drier.
• the results obtained as compared with the same emulsion having no antiplumming agent therein were as follows:
• a silver salt of acetylthioglycolylamidobenzothiazole was prepared by dissolving 0.675 g. thereof in 100 ml. of methanol, mixing with 187 grams of 6.6% gelatin solution plus sufiicient water to bring the total volume to 375 ml. and mixing the whole with a second solution of 44 ml. of 1% silver nitrate solution, 187 ml. of 6.6% gelatin solution mixed with sufficient water to bring the total volume to 375 ml. The solution of silver nitrate was added quickly and with stirring to the solution of acetylthioglycolylamidobenzothiazole.
• the silver salt in gelatin solution thus prepared was applied over a gelatin silver chloride emulsion layer on single Weight baryta coated paper base at a rate equivalent to 7.5 mg. of the silver salt of acetylthioglycolylamidoben zothiazole per sq. ft.,the emulsion coating being at the rate of approximately 1 mol of silver per 1000 sq. ft.
• Another application of the silver salt at the rate of 3.75 mg. per sq. ft. was made by first diluting the solution of gelatin and silver salt with an equal volume of 3.3% gelatin solution. These products were exposed and were developed, fixed and washed. Test strips of this photographic material were dried at 180 F. on a print drier and the table indicates the comparison of the maximum density of the product as compared to one in which the antiplumming agent was not supplied.
• AgX being silver halide.
• Example 4 The silver salt of thioglycolylamidobenzothiazole causes no desensitization when material containing that layers and the emulsion is applied thereover.
• Our invention is especially adapted for use in connection with photographic emulsions employed for photographic paper purposes in which drying at elevated temperatures occurs.
• a photographic element comprising a silver halide emulsion layer, containing as an additive thereto an antiplumming agent selected from the group consisting of the silver salt of thioglycolylamidobenzothiazole and the silver salt of acetylthioglycolylamidobenzothiazole.
• a photographic element comprising a silver halide emulsion layer containing as an additive thereto a sulficient proportion therein of a compound selected from the group consisting of the silver salt of thioglycolylamidohenzothiazole and the silver salt of acetylthioglycolylamidobenzothiazole to prevent plumming of the photographic image formed therefrom.
• a photographic element comprising a silver halide emulsion layer and in contact therewith a water permeable colloid layer containing as an additive thereto an antiplumming agent selected from the group consisting of the silver salts of thioglycolylamidobenzothiazole and the silver salts of acetylthioglycolylamidobenzothiazole.
• a photographic silver halide emulsion containing as an additive thereto the silver salt of thioglycolylamidm benzothiazole in suflicient amount to prevent plumming of the photographic image which is formed by the emulsion.
• a photographic silver halide emulsion containing as an additive thereto the silver salt of acetylthioglycolylamidobenzothiazole in sufficient amount to prevent plumming of the photographic image which is formed by the emulsion.
• a coating composition comprising an aqueous solution of gelatin containing as an additive thereto a compound selected from the group consisting of the silver salts of thioglycolylamidobenzothiazole and of acetylthioglycolylamidobenzothiazole.

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• Physics & Mathematics (AREA)
• Chemical & Material Sciences (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)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

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Citations (6)

• 0
  • BE BE548727D patent/BE548727A/xx unknown
• 1955
  • 1955-06-21 US US517092A patent/US2852380A/en not_active Expired - Lifetime
• 1956
  • 1956-06-13 GB GB18233/56A patent/GB794637A/en not_active Expired
  • 1956-06-20 FR FR1151738D patent/FR1151738A/fr not_active Expired

Patent Citations (7)

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