Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
  • C07C319/02—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of thiols
  • C07C319/12—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of thiols by reactions not involving the formation of mercapto groups
• • 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
• • 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
  • Y10S430/136—Coating process making radiation sensitive element
• • 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
  • Y10S430/139—Defect coating

Definitions

• This invention relates to a method -for obtaining photographic images which are protected aaginst bronzing caused by hot glazing or mechanical drying.
• the images obtained in light-sensitive silver halide emulsion layers often undergo changes during processing among others during hot glazing or mechanical drying at high temperature. During these treatments loss of density occurs easily by the so-called bronzing ofthe silver image.
• R represents an aryl group or a substituted arryl group
• R represents .a bivalent group such as an alkylene group
• X represents an oxygen atom or an imide group
• X represents a hydrogen atom, an alkaline metal atom
• the compounds according to the present invention can be used in their free mercapto form as well as in the form of their alkaline metal salts, their ammonium salts or their colloidal silver salts.
• the light-sensitive silver halide emulsion wherein compounds according to the present invention can be incorporated can be any silver halide emulsion such as 'a g'elatino-silver chloride emulsion, a gelatino-silver chlorobromide emulsion, a gelatino-silver chloroiodide emulsion, a gelatino-silver bromide emulsion, a gelatino-silver bromoiodide emulsion, and a gelatino-silver chlorobromoiodide emulsion.
• the emulsion can be sensitized chemically as we'll as optically. It may moveover contain all known additives such as anti-fogging agents, stabilizers, hardening agents, softening agents and dispersing agents.
• the compounds according to the present invention can be added during any stage of the preparation of the emulsion, e.g. during the formation of the silver halide or durration is given or reference is made to.
• Patented Nov. 1, 19 66 "ice ing the physical or chemical ripening, but preferably after the chemical ripening.
• the amount, in which the compounds according to the present invention may be added depends on the emulsion used but it generally varies from 0.15 to 9.0 g. (preferably from 0.25 to 4.7 g.) per mol of silver halide when using the free mercapto compounds, their alkaline metal salts or their ammonium salts, and from 0.3 g. to 18 g. (preferably fr-om 0.5 g. to 10 g.) per mol of silver halide when using their silver salts as a colloidal dispersion in gelatin or in another protective colloid.
• the amount in which the compounds according to the present invention are added to the covering layer or auxiliary water-permeable layers mostly varies from 5 to mg./ sq. m. when using them in their free mercapto form or in the form of their alkaline metal salts or ammonium salts and from 10 to 350 rug/sq. In. when using them in the form of their silver salts.
• the compounds according to the present invention may also be dissolved in a processing bath such as a fixing bath or a separate processing bath e.g. just be- :fore hot glazing or mechanical drying.
• This bath may eventually be a bath containing surface active substances.
• concentration in which the compounds according to the present invention are dissolved in such baths varies mostly from 0.5 g. to 2.5 g. per liter of bath.
• N-2-naphthyl-2'-mercaptoethyl carbamate is prepared as follows:
• N-phenyl-N'-2-mercapto-ethylurea is prepared as follows:
• N-1-naphthyl-N'-2-mercapto ethylurea is prepared as follows:
• Example 1 An ammoniacal gelatino-silver bromoiodide emulsion of average gradation, containing 3.5
• this light-sensitive emulsion layer is coated with a gelatincontaining covering layer.
• the material is exposed under a sensitometric step-wedge and after development, fixation and rinsing, it is hot-glazed by pressing the imageside against a heated polished metal surface.
• the reflection density is measured by means of a MacBeth densitometer before and after being subjected to high glossing. The following result is obtained.
• Comparison material (containing no antibronzing agent according to this invention) 2.13 1. 80 A material such as the comparison material,
• Example 2 An ammoniacal gelatino-silver bromoiodide emulsion of average gradation, containing 3.0 mol percent of silver iodide based on the total amount of silver halide and to which products according to the invention have been added, is applied on a baryta-coated paper supportv in such a Way, that the emulsion layer comprises per sq. m. an amount of silver halide equivalent to 2.5 g. of silver nitrate.
• Comparison material (containing no antibronzing agent according to this invention) 1.
• Comparison material (containing no antibronzing agent according to this invention) 1.
• Example 3 An ammoniacal gelatino-silver bromoiodide emulsion of hard gradation, containing 1.0 mol percent of silver iodide based on the total amount of silver halide, and to which products according to the invention have been added, is applied on a baryta-coated paper support in such a way, that the emulsion layer comprises per sq. m. an amount of silver halide equivalent to 2.8 g. of silver nitrate. After treating the material in the same way as the material of Example 1, the following results are obtained:
• Comparison material (containing no antibronzing agent according to this invention) 2. 11 1. 82 A material such as the comparison material,
• Example 4 A light-sensitive material as described in Example 1, but containing no products according to this invention, is exposed, developed and treated in a fixing bath, containing per litre 1 g. of the product according to preparation 1. The following results are obtained:
• Example 5 A gelatino-Silver chloroiodide emulsion containing 1.5 mol percent of silveriodide based on the total amount of silver halide, to which the usual coating compositions have been added, is applied on a barytacoated paper support. After drying, this material is exposed under a step-Wedge, developed, fixed and rinsed. The material thus processed is subjected to high glossing by pressing the image-side against a heated polished metal surface. A strong bronzing of the silver image arises especially in the highlight areas. However, when starting from a same emulsion to which per 12 g. of silver, an alcoholic solution of 385 mg. of the product according to preparatiorrl is added before coating, only a very little decrease in density arises after being subjected to high glossing. The maximum density of these two materials is measured by means of a MacBeth densitometer. The results are listed below.
• graphic material keeps its density after high glossing.
• Example 7 An orthochromatic gelatino-silver chloroiodide emulsion for document reproduction purposes, containing 0.6 mol percent of silver iodide based on the total amount of silver halide and having been prepared from 45 g. of silver nitrate per kg. of emulsion, is applied on a baryta-coated paper support of 90 g./sq. m. A strip of this material is exposed under a step-wedge. After being developed, fixed and rinsed, this strip is mechanically dried by pressing it with its back-side against a heated metal surface. The material thus treated shows a considerable bronzing especially on the areas of high density.
• R is an aryl group
• R is an organic bivalent aliphatic group
• X is a member selected from the group consisting of an oxygen atom and an NH group
• X is a member selected from the group consisting of a hydrogen atom, an alkali metal atom, an ammonium group and a silver atom.
• a photographic material comprising a support, at least one light-sensitive silver halide emulsion layer and at least one Water permeable layer on the same side of said support as said emulsion layer, wherein the lightsensitive silver halide emulsion layer and the water-permeable layer contain, as an antibronzing agent, an operable amount of-at least one compound of the formula:
• R1' NH (I? X1 "R2SX2 wherein: R is an aryl group, R is an organic bivalent aliphaticgroup, and
• - X is a member selected from the group consisting of an oxygen atom and an 'NH group
• X is a member selected from the group consisting of a hydrogen atom, an alkali metal atom, an ammonium group and a silver atom. 3.
• a photographic material comprising a support, at
• R is an aryl group
• R is an organic bivalent aliphatic group
• X is a member selected from the group consisting of an 7.
• the photographic material of claim 1 wherein the anti-bronzing agent has the formula:

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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  • BE BE612311D patent/BE612311A/xx unknown
• 1963
  • 1963-01-04 GB GB487/63A patent/GB1002329A/en not_active Expired
  • 1963-01-04 DE DEG36781A patent/DE1155013B/de active Pending
  • 1963-01-04 GB GB486/63A patent/GB1024035A/en not_active Expired
  • 1963-01-04 DE DEG36782A patent/DE1155330B/de active Pending
  • 1963-01-07 US US249615A patent/US3203800A/en not_active Expired - Lifetime
  • 1963-01-07 US US249595A patent/US3282696A/en not_active Expired - Lifetime

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