EP0600543A1 - Verfahren zur Herstellung von Silberhalogenidkörnern - Google Patents

Verfahren zur Herstellung von Silberhalogenidkörnern Download PDF

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Publication number
EP0600543A1
EP0600543A1 EP93203293A EP93203293A EP0600543A1 EP 0600543 A1 EP0600543 A1 EP 0600543A1 EP 93203293 A EP93203293 A EP 93203293A EP 93203293 A EP93203293 A EP 93203293A EP 0600543 A1 EP0600543 A1 EP 0600543A1
Authority
EP
European Patent Office
Prior art keywords
gelatin
range
reactor
process according
halide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93203293A
Other languages
English (en)
French (fr)
Other versions
EP0600543B1 (de
Inventor
John Arthur Kodak Limited Bee
Andrew Kodak Limited Hartman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kodak Ltd
Eastman Kodak Co
Original Assignee
Kodak Ltd
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kodak Ltd, Eastman Kodak Co filed Critical Kodak Ltd
Publication of EP0600543A1 publication Critical patent/EP0600543A1/de
Application granted granted Critical
Publication of EP0600543B1 publication Critical patent/EP0600543B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03C1/04—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with macromolecular additives; with layer-forming substances
    • G03C1/047—Proteins, e.g. gelatine derivatives; Hydrolysis or extraction products of proteins

Definitions

  • This invention relates to a process for producing silver halide grains and to a process for the formation of a photographic emulsion.
  • nucleus formation is a step in which new crystals are formed and a sharp increase in the number of crystals takes place.
  • Crystal growth is a step in which new layers are added to existing crystals. Nucleus formation is rapid, generally taking less than a minute. Crystal growth is slower, generally taking 20 to 60 minutes.
  • silver halide grains are precipitated in the presence of a protective colloid i.e. gelatin.
  • a protective colloid i.e. gelatin.
  • Conventional gelatin solutions display a sol-gel property and this generally constrains precipitation of silver halide emulsions in which gelatin is used as a peptizing agent to temperatures above 35 C.
  • European Patent Application EP-A-374853 relates to a process of producing silver halide grains in which the inventive step is to separate nucleus formation step (a) from crystal growth step (b) by carrying out the former in a separate mixer outside the reactor in which (b) takes place.
  • the stated aim of this process is to produce silver crystal grains having a homogeneous halide composition in each crystal and having no halide distribution among the grains.
  • the nucleus formation step in this process is carried out at a reduced temperature in the presence of low molecular weight gelatin which can be obtained from ordinary gelatin.
  • the use of low molecular weight gelatin in this process is confined to step (a) in the mixer. It is not used in step (b) in the main reactor.
  • a process for the production of silver halide grains in which an aqueous solution comprising a water-soluble halide, a water-soluble silver salt and a protective colloid is produced in a reactor and silver halide grains are formed in the reactor by reaction of the halide and the silver salt, nucleus formation and crystal growth both taking place in the reactor characterised in that a major proportion of the protective colloid is a modified mammalian gelatin having a mean molecular weight in the range 5000 to 30000 daltons.
  • a process for the formation of a photographic emulsion in which an aqueous solution comprising a water-soluble halide, a water-soluble silver salt and a protective colloid is produced in a reactor and silver halide grains are formed in the reactor by reaction of the halide and the silver salt, nucleus formation and crystal growth both taking place in the reactor characterised in that a major proportion of the protective colloid is a modified mammalian gelatin having a mean molecular weight in the range 5000 to 30000 daltons.
  • the silver halide grains are produced by reacting an aqueous silver salt solution and an aqueous halide solution in an aqueous colloid solution in the reactor. This can be done in any suitable manner. Possible modes of operation include the single jet method and the double jet method. In the single jet method the aqueous solution of the colloid and the halide are placed in the reactor and the aqueous silver salt solution is added with stirring for a suitable time. In the double jet method, which is preferred, the aqueous colloid solution is placed in the reactor and the aqueous halide solution and the aqueous salt solution are added to the solution in the reactor.
  • the modified mammalian gelatin has a mean molecular weight in the range 5000 to 30000, preferably in the range 10000 to 20000.
  • modified gelatin can be obtained in a variety of ways. It can be obtained by treating an aqueous solution of normal gelatin, which generally will have a mean molecular weight of approximately 100000, with a gelatin decomposing enzyme such as trypsin. Alternatively the gelatin can be hydrolised with an acid, heating it at a low pH e.g.in the range 1 to 3, or with a base, heating it at a high pH e.g. in the range 10 to 12.
  • the process is carried out at a temperature up to 35 C, a preferred range being 5 to 35 C.
  • ambient temperature i. e. the range 18 to 20 C
  • Heating of the reactor is preferably avoided.
  • the process temperature is preferably controlled within a narrow range, i.e. to within 0.5 degrees and particularly to within the range 0.25 to 0.3 degrees C.
  • Halides and silver salts are preferred which can be used to precipitate silver chloride, bromide, bromoiodide or chlorobromide.
  • Particularly preferred as the halide is sodium chloride and as the silver salt silver nitrate.
  • halide and the silver salt are supplied to the reactor in the double jet method, it is convenient for them to be supplied at the same or at similar rates, suitable rates depending partly upon the scale of operation. It is preferred that during the process the vAg of the solution is controlled to prevent significant variation.
  • the vAg of the solution is controlled to prevent significant variation.

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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)
  • Colloid Chemistry (AREA)
EP19930203293 1992-11-28 1993-11-25 Verfahren zur Herstellung von Silberhalogenidkörnern Expired - Lifetime EP0600543B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929224967A GB9224967D0 (en) 1992-11-28 1992-11-28 Process for producing silver halide grains
GB9224967 1992-11-28

Publications (2)

Publication Number Publication Date
EP0600543A1 true EP0600543A1 (de) 1994-06-08
EP0600543B1 EP0600543B1 (de) 1999-03-03

Family

ID=10725837

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930203293 Expired - Lifetime EP0600543B1 (de) 1992-11-28 1993-11-25 Verfahren zur Herstellung von Silberhalogenidkörnern

Country Status (4)

Country Link
EP (1) EP0600543B1 (de)
JP (1) JPH06214329A (de)
DE (1) DE69323697T2 (de)
GB (1) GB9224967D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6344312B1 (en) 1999-02-10 2002-02-05 Fuji Photo Film Co., Ltd. Heat developable photosensitive material

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1173196A (en) * 1967-01-24 1969-12-03 Wolfen Filmfab Veb Photographic Material Containing Silver Halide and Process for its Manufacture
GB1177185A (en) * 1966-09-20 1970-01-07 Eastman Kodak Co Photographic Emulsions
JPH01213637A (ja) * 1988-02-22 1989-08-28 Fuji Photo Film Co Ltd ハロゲン化銀乳剤とその製造方法並びに処理方法
JPH02838A (ja) * 1987-12-17 1990-01-05 Fuji Photo Film Co Ltd ハロゲン化銀乳剤及びその製造方法
JPH04110935A (ja) * 1990-08-31 1992-04-13 Konica Corp ハロゲン化銀写真乳剤
JPH04110934A (ja) * 1990-08-31 1992-04-13 Konica Corp ハロゲン化銀写真乳剤及びその製造方法
US5145768A (en) * 1988-12-22 1992-09-08 Fuji Photo Film Co., Ltd. Process of forming silver halide grains

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1177185A (en) * 1966-09-20 1970-01-07 Eastman Kodak Co Photographic Emulsions
GB1173196A (en) * 1967-01-24 1969-12-03 Wolfen Filmfab Veb Photographic Material Containing Silver Halide and Process for its Manufacture
JPH02838A (ja) * 1987-12-17 1990-01-05 Fuji Photo Film Co Ltd ハロゲン化銀乳剤及びその製造方法
JPH01213637A (ja) * 1988-02-22 1989-08-28 Fuji Photo Film Co Ltd ハロゲン化銀乳剤とその製造方法並びに処理方法
US5145768A (en) * 1988-12-22 1992-09-08 Fuji Photo Film Co., Ltd. Process of forming silver halide grains
JPH04110935A (ja) * 1990-08-31 1992-04-13 Konica Corp ハロゲン化銀写真乳剤
JPH04110934A (ja) * 1990-08-31 1992-04-13 Konica Corp ハロゲン化銀写真乳剤及びその製造方法

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 9223, Derwent World Patents Index; Class A12, AN 92187528 *
DATABASE WPI Week 8940, Derwent World Patents Index; AN 89289978 *
DATABASE WPI Week 9007, Derwent World Patents Index; AN 90048068 *
DATABASE WPI Week 9223, Derwent World Patents Index; AN 92187527 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6344312B1 (en) 1999-02-10 2002-02-05 Fuji Photo Film Co., Ltd. Heat developable photosensitive material

Also Published As

Publication number Publication date
DE69323697T2 (de) 1999-09-30
JPH06214329A (ja) 1994-08-05
DE69323697D1 (de) 1999-04-08
GB9224967D0 (en) 1993-01-20
EP0600543B1 (de) 1999-03-03

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