DE559120C - Process for removing the preparation layer from photographic films and film waste - Google Patents

Process for removing the preparation layer from photographic films and film waste

Info

Publication number
DE559120C
DE559120C DEI41541D DEI0041541D DE559120C DE 559120 C DE559120 C DE 559120C DE I41541 D DEI41541 D DE I41541D DE I0041541 D DEI0041541 D DE I0041541D DE 559120 C DE559120 C DE 559120C
Authority
DE
Germany
Prior art keywords
layer
film waste
preparation layer
photographic films
film
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
DEI41541D
Other languages
German (de)
Inventor
Dr Bruno Breyer
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
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEI41541D priority Critical patent/DE559120C/en
Application granted granted Critical
Publication of DE559120C publication Critical patent/DE559120C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/08—Cellulose derivatives
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Description

Verfahren zur Entfernung der Präparationsschicht aus photographischen Filmen und Filmabfällen Es ist bekannt, daß man beim Auflösen der für kinematographische Zwecke usw. gebrauchten, aus Celluloid oder ähnlichen plastischen Massen bestehenden Filme und Filmabfälle vor oder nach der Entfernung der photographischen Schicht in den üblichen Lösungsmitteln meist faserhaltige, stark getrübte Flüssigkeiten erhält. Diese Trübungen rühren von Eiweißstoffen her, die zur Vorpräparation des Films zwecks Verbesserung der Haftfestigkeit der Emulsionsschicht angewendet werden und die tief in die Filmschicht eingelagert sind. Diese Schicht, die bei der üblichen Behandlung der Filmabfälle mit heißem Wasser nicht mit abgewaschen wird, ist mit den gebräuchlichen Mitteln, wie z. B. Alkalien, häufig nicht oder nur nach teilweiser Zerstörung der Filmsubstanz entfernbar. Bisher war man der Meinung, daß auch Säuren -zur Ablösung dieser Präparationsschicht nicht geeignet wären.Process for removing the preparatory layer from photographic Films and Film Waste It is known that when resolving the for cinematographic Purposes, etc. used, consisting of celluloid or similar plastic masses Films and film waste before or after removal of the photographic layer in the usual solvents mostly fibrous, heavily cloudy liquids receives. This cloudiness is caused by proteins that are used to prepare the Films can be used to improve the adhesive strength of the emulsion layer and which are embedded deep in the film layer. This layer that with the usual Treatment of film waste with hot water is not washed off with is having the usual means, such as. B. alkalis, often not or only partially Destruction of the film substance can be removed. So far it was believed that acids - would not be suitable for detaching this preparation layer.

Im Gegensatz dazu wurde nun festgestellt, daß wäßrige Lösungen von Phosphorsäure hervorragend zur Entfernung dieser Schicht geeignet sind, und daß die so gereinigten Filme klare Cellufoseesterlösungen liefern, die z. B. zur Herstellung von Lacken, Klebstoffen usw. mit Vorteil verwendet werden können. Beispiel Abgespielter Kinofilm wird zunächst, wie üblich, durch Behandlung mit warmem Wasser von der photographischen Schicht befreit und darauf der Einwirkung von 9o °/oiger Phosphorsäure bei einer Temperatur von etwa 8o° ausgesetzt. Nach dem Abspülen der Phosphorsäure in Wasser und Trocknen ist der Film in den üblichen Celluloidlösungsmitteln klar löslich.In contrast, it has now been found that aqueous solutions of Phosphoric acid are excellent for removing this layer, and that the thus purified films provide clear cellulose ester solutions which, for. B. for production paints, adhesives, etc. can be used with advantage. Example played As usual, cinema film is first removed from photographic film by treatment with warm water Layer freed and then the action of 90% phosphoric acid in a Exposed to a temperature of about 8o °. After rinsing the phosphoric acid in water and drying, the film is clearly soluble in common celluloid solvents.

Claims (1)

PATENTANSPRUCH: Verfahren zur Entfernung der Präparationsschicht aus photographischen Filmen und Filmabfällen, dadurch gekennzeichnet, daß man wäßrige Lösungen der Phosphorsäure auf die von der photographischen Schicht befreiten Filme einwirken läßt.PATENT CLAIM: Process for removing the preparation layer from Photographic films and film waste, characterized in that aqueous Solutions of phosphoric acid on the films from which the photographic layer has been removed can act.
DEI41541D 1931-05-14 1931-05-14 Process for removing the preparation layer from photographic films and film waste Expired DE559120C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEI41541D DE559120C (en) 1931-05-14 1931-05-14 Process for removing the preparation layer from photographic films and film waste

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI41541D DE559120C (en) 1931-05-14 1931-05-14 Process for removing the preparation layer from photographic films and film waste

Publications (1)

Publication Number Publication Date
DE559120C true DE559120C (en) 1932-09-15

Family

ID=7190567

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI41541D Expired DE559120C (en) 1931-05-14 1931-05-14 Process for removing the preparation layer from photographic films and film waste

Country Status (1)

Country Link
DE (1) DE559120C (en)

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