DE737660C - Process for the preservation of aqueous solutions of polyvinyl alcohols or their water-soluble derivatives - Google Patents

Process for the preservation of aqueous solutions of polyvinyl alcohols or their water-soluble derivatives

Info

Publication number
DE737660C
DE737660C DEC56854D DEC0056854D DE737660C DE 737660 C DE737660 C DE 737660C DE C56854 D DEC56854 D DE C56854D DE C0056854 D DEC0056854 D DE C0056854D DE 737660 C DE737660 C DE 737660C
Authority
DE
Germany
Prior art keywords
water
polyvinyl alcohols
preservation
aqueous solutions
soluble derivatives
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
DEC56854D
Other languages
German (de)
Inventor
Emil Reiter
Dr Alfred Treibs
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.)
Consortium fuer Elektrochemische Industrie GmbH
Original Assignee
Consortium fuer Elektrochemische Industrie GmbH
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 Consortium fuer Elektrochemische Industrie GmbH filed Critical Consortium fuer Elektrochemische Industrie GmbH
Priority to DEC56854D priority Critical patent/DE737660C/en
Application granted granted Critical
Publication of DE737660C publication Critical patent/DE737660C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/04—Chromates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Description

Verfahren zum Haltbarmachen von wäßrigen Lösungen von Polyvinylalkoholen - - oder ihren wasserlöslichen Derivaten Die Verwendung., von. Polyvinylalkoholen oder ihren wasserlöslichen. Derivaten anstatt Gelatine zur Herstellung von- Druckformen ist bekannt. .Sie beruht auf der Gerbfähigkeit ,von Polyvinylalkohol durch Belichtung in Gegenwart vonaBichromat.- Bei den Lösungen der Pölyvinxlälkohole usw. zeigt sich des öfteren der Übelstand, daß sie bei längerem Aufbewahren .gelieren und dann in dieser Form zur Beschichtung der Metallplatten nicht Verwendung finden können. Die Entwicklung; d. h. die Entfernung der unbelichteten Anteile mittels Wässer wird bei einer Schicht, die aus .einer zur Gelierung neigenden Lösung hergestellt ist,- ,sehr ungünstig beeinflußt Diese Tendenz zur Koagulation wird durch Farbstoffe" deren Zusatz für die,. Kopierzwecke erforderlich ist, um die -Schicht sichtbar zu machen, gefördert. Die Koagulation mu(.'> durch Erwärmung rückgängig gemacht werden,. was in den- graphischen Betrieben; -die nicht über die dazu nötigen technischen Einrichtungen verfügen, auf Schwierigkeiten stößt;. sei kann eine derartige--Lösung beispielsweise- -nicht durch direkte Bchcizung tn,it der Flamme erwärmt werden, da dabei ein Anbrennen stattfindet.Process for preserving aqueous solutions of polyvinyl alcohols - - or their water-soluble derivatives The use., of. Polyvinyl alcohols or their water-soluble ones. Derivatives instead of gelatine for the production of printing forms is known. It is based on the tannability of polyvinyl alcohol through exposure to light in the presence of a dichromate. In the solutions of polyvinyl alcohols etc. often the disadvantage that they .gelieren after prolonged storage and then in this form for coating the metal plates can not be used. the Development; d. H. the removal of the unexposed parts by means of water with a layer that is made from a solution that tends to gel, , very unfavorably influenced This tendency to coagulation is caused by dyes " their addition for the ,. Copying purposes is required to make the -Layer visible make, promoted. The coagulation must be reversed by heating. what in dengraphic companies; -that do not have the necessary technical Facilities have difficulties. may be such a - solution for example- -not be heated by direct exposure to the flame, because burning takes place.

Es wurde nun gefunden, daß durch- Zusatz von Rhödansalzen die Haltbarkeit der Kopierlösung erheblich verbessert wird, indem die Neigung zur Gelierung stark herabgesetzt wird: Eine durch Kälteeinwirkung eingetretene Gelierung wird viel leichter und schon bei -viel niedrigerer Temperatur rückgängig gemacht. Durch den Rhodanidzusatz wird die Entwicklung der belichteten Kopierschicht erleichtert. , Günstig beeinflußt werden auch solche Lösungen, die durch Zusätze, wie die obenerwähnten rarbstoffzusätzc noch leicliter koagulieren. Der Rhodanidzusatä- bewirk l auch eine geringe Verminderung der Viscosität der Lösungen.It has now been found that the shelf life is improved by adding Rhödan salts the copying solution is considerably improved by the tendency to gel strongly is reduced: Gelation caused by exposure to cold becomes much easier and reversed at a much lower temperature. By adding rhodanide the development of the exposed copy layer is facilitated. , Favorably influenced Such solutions are also made possible by additives such as the abovementioned rare substances coagulate even less. The Rhodanidzusatä also causes a slight reduction the viscosity of the solutions.

Wirksam erweisen sich -schon, sehr geringe Mengen an Rhodapid; brauchbar sind wasserlösliche Rhodansalze, deren Zusatz in weiten Grenzen abgestuft werden kann. Es genügte z. B. 0t 5 % -Ammonfumrhddanid, um eine Löstnig; die nach einigen Stunden bei o° koagulierte; bei 2o" wieder in den Normalzustand zu versetzen, während -ohne Rhodanammoniumzusatz eine Erwärmung auf mindestens 7o° nötig war. Very small amounts of Rhodapid have proven to be effective; Water-soluble rhodan salts, the addition of which can be graded within wide limits, can be used. It was enough z. B. 0t 5% -Ammonfumrhddanid, to a loosening; which coagulated after a few hours at o °; at 2o "to return to the normal state, while -without the addition of rhodanammonium, heating to at least 70 ° was necessary.

Die Verbesserung der Lagerfähigkeit von 1'olyvinylalkohollösungen kann auch fet andere Vfrwendungszwecke von Nutzen 'sein. Dabei ergibt sich noch der Vorteil; daß Rhodanverbindungen sterilisierend wirken.Improving the shelf life of polyvinyl alcohol solutions May be useful for other purposes as well. It still results the advantage; that rhodan compounds have a sterilizing effect.

Claims (1)

PATENTANSPRUCH: Verfahren zum Haltbarmachen von wäB-rigen Lösungen von Polyvinylalkoholen oder ihren wasserlöslichen Derivaten. gekennzeichnet durch den Zusatz von wasserlöslichen Rhodansalzen.PATENT CLAIM: Process for the preservation of aqueous solutions of polyvinyl alcohols or their water-soluble derivatives. marked by the addition of water-soluble rhodan salts.
DEC56854D 1941-10-25 1941-10-26 Process for the preservation of aqueous solutions of polyvinyl alcohols or their water-soluble derivatives Expired DE737660C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEC56854D DE737660C (en) 1941-10-25 1941-10-26 Process for the preservation of aqueous solutions of polyvinyl alcohols or their water-soluble derivatives

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEC0056854 1941-10-25
DEC56854D DE737660C (en) 1941-10-25 1941-10-26 Process for the preservation of aqueous solutions of polyvinyl alcohols or their water-soluble derivatives

Publications (1)

Publication Number Publication Date
DE737660C true DE737660C (en) 1943-07-20

Family

ID=25970492

Family Applications (1)

Application Number Title Priority Date Filing Date
DEC56854D Expired DE737660C (en) 1941-10-25 1941-10-26 Process for the preservation of aqueous solutions of polyvinyl alcohols or their water-soluble derivatives

Country Status (1)

Country Link
DE (1) DE737660C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE873374C (en) * 1950-11-14 1953-08-10 Peter Eyrich Seamless wall covering

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE873374C (en) * 1950-11-14 1953-08-10 Peter Eyrich Seamless wall covering

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