DE679744C - Over-sensitization of photographic emulsions without the use of electrolytes - Google Patents

Over-sensitization of photographic emulsions without the use of electrolytes

Info

Publication number
DE679744C
DE679744C DED78084A DED0078084A DE679744C DE 679744 C DE679744 C DE 679744C DE D78084 A DED78084 A DE D78084A DE D0078084 A DED0078084 A DE D0078084A DE 679744 C DE679744 C DE 679744C
Authority
DE
Germany
Prior art keywords
mercury
sensitization
over
electrolytes
photographic emulsions
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.)
Expired
Application number
DED78084A
Other languages
German (de)
Inventor
Dr-Ing Ulrich Schmieschek
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.)
Deutsche Versuchsanstalt fuer Luftfahrt eV
Original Assignee
Deutsche Versuchsanstalt fuer Luftfahrt eV
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
Priority claimed from DED75405A external-priority patent/DE674634C/en
Application filed by Deutsche Versuchsanstalt fuer Luftfahrt eV filed Critical Deutsche Versuchsanstalt fuer Luftfahrt eV
Priority to DED78084A priority Critical patent/DE679744C/en
Application granted granted Critical
Publication of DE679744C publication Critical patent/DE679744C/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00Photosensitive materials
    • G03C1/005Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/08Sensitivity-increasing substances
    • G03C1/09Noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g. for chemical sensitising

Landscapes

  • 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)
  • Hybrid Cells (AREA)

Description

LJbersensibilisierung photographischer Emulsionen ohne Anwendung von Elektrolyten Zusatz zum Patent 674 634 Im Hauptpatent 67¢ 634 wird ein Verfahren zur übersensibilisierung photographischer Emulsionen beschrieben, dessen Wesen darin liegt, daß die photographische Emulsion kur zzeitig in Quecksilberbäder höherer Temperaturen :eingetaucht wird. Je kürzer die Eintauchzeit ist, je höher müssen die Temperaturen des Quecksilbers sein. Zu hohe Temperaturen haben aber eine Schädigung der photographischen Emulsion zur Folge.Oversensitization of photographic emulsions without the use of Electrolytes Addition to Patent 674 634 In the main patent 67 ¢ 634, a process is used described for the oversensitization of photographic emulsions, its essence therein is that the photographic emulsion briefly in mercury baths higher Temperatures: is immersed. The shorter the immersion time, the higher the need be the temperatures of the mercury. However, temperatures that are too high can be damaged of the photographic emulsion.

Nach dem Gegenstand vorliegender Erfindung wird nun dadurch eine günstigere Wirkung erreicht, daß die Emulsionen in Quecksilber von normaler oder ,auch höherer Temperatur getaucht werden, wobei auf dem Quecksilber ein höherer Druck als Atmosphärendruck lastet. Der Überdruck kann beispielsweise derart hergestellt werden, daß sich das Quecksilber in einem autoklavenähnlichen Gefäß befindet, welches mit einer Preßgas-Hasche in Verbindung steht, so daß also in dem über dem Quecksilber befindlichen freien Autoklavenraum nach Maßgabe der Ventilbetätigung ein gewünschter Druck, der somit gleichzeitig :auf das Quecksilber wirkt, eingestellt werden kann. Zur Erzielung des benötigten Druckes kann man sich sowohl komprimierter Luft als ;auch mit besonderem Vorteil inerter Gase bedienen. Bei der Übersensibilisierung von Film ist das Übersensibilisierungsverfahren z-,veckmäßigerweise kontinuierlich ,auszugestalten, in der Art, daß der Film mit einer von der Quecksilbertemperatur und dem über dem Quecksilber hastenden Druck :abhängigen Geschwindigkeit durch das Quecksilberbad gezogen wird. Dabei ist es zweckmäßig, die Schlitze, durch die man den Film in das Quecksilberbad hinein- und hinausführt, mit entsprechenden Abdichtungen unterhalb der Quecksilberober- Fläche anzubringen,. da auf diese Weise der Film stets -mit sauberem Quecksilber in Berührung kommt.According to the subject matter of the present invention, this now becomes a cheaper one Effect achieved that the emulsions in mercury of normal or, even higher Temperature are immersed, with a higher pressure than atmospheric pressure on the mercury burdens. The overpressure can be produced, for example, in such a way that the Mercury is in an autoclave-like vessel, which with a compressed gas hash is connected, so that in the free one located above the mercury Autoclave space according to the valve actuation a desired pressure, which is thus at the same time: on which mercury acts, can be adjusted. To achieve the required pressure can be used both with compressed air and with special Use the advantage of inert gases. When oversensitizing film, the oversensitization procedure is z-, preferably continuously, to design in such a way that the film with one of the mercury temperature and the pressure bustling above the mercury : dependent speed is drawn through the mercury bath. It is there expediently, the slots through which the film can be inserted into the mercury bath and leads out, with appropriate seals below the mercury upper area to be attached. because in this way the film is always in contact with clean mercury comes.

Ausführungsbeispiel Man gibt ein mit Quecksilber gefülltes Ge-fäß in einen Aütoklaven, den man erhitzt, bis das Quecksilber eine Temperatur von etwa 5J C :angenommen hat, und beschickt das Quecksilberbad mit der photographischen Platte. Nachdem der Autokl.av verschlossen ist, wird mit Hilfe von Preßluft ein überdruck von etwa 4,at erzeugt rund die Temperatur des Quecksilberbades auf 6o° -C erhöht. Nach 2o Minuten wird die photographische Platte ,aus dem Quecksilberbad Behandelt man auf diese Weise eine Agfa phototechnische Platte A, dann steigt deren Schwellenempfindlichkeit um et-,va das 36fache bei gleichbleibendem Schleier. Embodiment A vessel filled with mercury is placed in an autoclave, which is heated until the mercury has reached a temperature of about 5 ° C., and the mercury bath is charged with the photographic plate. After the autoclave is closed, an overpressure of about 4 atm is generated with the help of compressed air, around the temperature of the mercury bath is increased to 60 ° C. After 20 minutes the photographic plate is out of the mercury bath. If an Agfa phototechnical plate A is treated in this way, its threshold sensitivity increases by about 36 times, with constant fog.

-.Im Gegensatz dazu .steigt die Empfindlichkeit euer Agfa phototechnischen Platte A, die man 4 Wochen lang quecksilberhaltiger Luft aussetzt, nur um das etwa i,6fache.- In contrast, the sensitivity of your Agfa phototechnical increases Plate A exposed to mercury-containing air for 4 weeks, just about i, 6 times.

Claims (1)

PATENTANSPRUCH: ilbersensibilisierung photographischer Emulsionen ohne Anwendung von Elektrolyten nach Patent 674634, dadurch gekennzeichnet, daß die Emulsionen in Quecksilber von normaler oder erhöhter Temperatur unter erhöhtem Druck eingetaucht werden.PATENT CLAIM: Over-sensitization of photographic emulsions without the use of electrolytes according to patent 674634, characterized in that the emulsions in mercury of normal or elevated temperature under elevated Pressure to be immersed.
DED78084A 1937-05-27 1938-05-31 Over-sensitization of photographic emulsions without the use of electrolytes Expired DE679744C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DED78084A DE679744C (en) 1937-05-27 1938-05-31 Over-sensitization of photographic emulsions without the use of electrolytes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DED75405A DE674634C (en) 1937-05-27 1937-05-27 Over-sensitization of photographic emulsions without the use of electrolytes
DED78084A DE679744C (en) 1937-05-27 1938-05-31 Over-sensitization of photographic emulsions without the use of electrolytes

Publications (1)

Publication Number Publication Date
DE679744C true DE679744C (en) 1939-08-15

Family

ID=25972781

Family Applications (1)

Application Number Title Priority Date Filing Date
DED78084A Expired DE679744C (en) 1937-05-27 1938-05-31 Over-sensitization of photographic emulsions without the use of electrolytes

Country Status (1)

Country Link
DE (1) DE679744C (en)

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