DE472890C - Process for making halo-free photographic plates - Google Patents

Process for making halo-free photographic plates

Info

Publication number
DE472890C
DE472890C DEI31545D DEI0031545D DE472890C DE 472890 C DE472890 C DE 472890C DE I31545 D DEI31545 D DE I31545D DE I0031545 D DEI0031545 D DE I0031545D DE 472890 C DE472890 C DE 472890C
Authority
DE
Germany
Prior art keywords
photographic plates
halo
free photographic
making
free
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
DEI31545D
Other languages
German (de)
Inventor
Dr Ernst Leupold
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 DEI30908D external-priority patent/DE472115C/en
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEI31545D priority Critical patent/DE472890C/en
Application granted granted Critical
Publication of DE472890C publication Critical patent/DE472890C/en
Expired legal-status Critical Current

Links

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
    • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
    • G03C1/825—Photosensitive materials characterised by the base or auxiliary layers characterised by antireflection means or visible-light filtering means, e.g. antihalation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Laminated Bodies (AREA)

Description

Verfahren zur Herstellung von lichthoffreien photographischen Platten In dem Patent 4.72 115 ist ein Verfahren zur Herstellung von lichthoffreien photographischen Platten beschrieben, welche vor dem Aufbringen der Emulsion auf der nicht für den Emulsionsauftrag bestimmten Seite mit einer im Entwickler nicht löslichen Schicht überzogen sind, die während der Entwicklung als zusammenhängendes Häutchen abschwimmt oder sich als solches mühelos ablösen läßt.Process for the production of halo-free photographic plates Patent 4.72 1 1 5 describes a process for the production of halo-free photographic plates which, before the application of the emulsion, are coated on the side not intended for emulsion application with a layer which is insoluble in the developer floats off as a coherent membrane during development or can easily be detached as such.

Es hat sich nun gezeigt, daß Lichthofschutzschichten mit diesen Eigenschaften auch vorteilhaft durch . Auftragen einer mit einem Farbstoff und mit Formaldehyd versetzten alkalischen Caseinlösung auf die Rückseite des Schichtträgers hergestellt werden können. Geeignete Farbstoffe sind z. B. Säureschwarz 2 B, Nigrosin D wasserlöslich, Wollschwarz 4. B uhd andere oder auch Kienruß. Beispiel 75 g Casein werden- in 300 ccm Wasser unter Zusatz von z ccm Ammoniak D. o,9 r gelöst und 37,5 g Kienruß aufs feinste mit der Lösung gemischt. Nach Auffüllen mit Wasser auf etwa 95o ccm werden 35,5 ccm 3prozentige Formaldehydlösung langsam unter stetem Umschütteln hinzugefügt. Die schließlich mit Wasser auf z 1 aufgefüllte Mischung wird auf die Rückseite von photographischen Trockenplatten gegossen.It has now been shown that antihalation layers with these properties also have an advantageous effect. Application of an alkaline casein solution mixed with a dye and formaldehyde to the back of the layer support can be produced. Suitable dyes are e.g. B. Acid black 2 B, nigrosine D water-soluble, wool black 4. B uhd other or also pine soot. Example 75 g of casein are dissolved in 300 cc of water with the addition of z cc of ammonia D. o.9r and 37.5 g of pine soot are finely mixed with the solution. After filling up with water to about 95o ccm, 35.5 ccm of 3 percent formaldehyde solution is slowly added with constant shaking. The mixture, finally made up to z 1 with water, is poured onto the back of photographic drying plates.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Lichthofschutzschichten gemäß Patent 472 115, welche während der Entwicklung als zusammenhängendes Häutchen abschwimmen, dadurch gekennzeichnet, daß eine mit einem Farbstoff und mit Formaldehyd versetzte alkalische Caseinlösung auf die Rückseite des Schichtträgers aufgetragen wird.PATENT CLAIM: Process for the production of antihalation layers according to patent 472,115, which during development as a coherent pellicle swim off, characterized in that one with a dye and with formaldehyde mixed alkaline casein solution applied to the back of the support will.
DEI31545D 1927-04-09 1927-06-30 Process for making halo-free photographic plates Expired DE472890C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEI31545D DE472890C (en) 1927-04-09 1927-06-30 Process for making halo-free photographic plates

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEI30908D DE472115C (en) 1927-04-09 1927-04-09 Production of halo-free photographic plates
DEI31545D DE472890C (en) 1927-04-09 1927-06-30 Process for making halo-free photographic plates

Publications (1)

Publication Number Publication Date
DE472890C true DE472890C (en) 1929-03-06

Family

ID=25981414

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI31545D Expired DE472890C (en) 1927-04-09 1927-06-30 Process for making halo-free photographic plates

Country Status (1)

Country Link
DE (1) DE472890C (en)

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