AT33970B - Process for the production of light-resistant lithopone. - Google Patents

Process for the production of light-resistant lithopone.

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Publication number
AT33970B
AT33970B AT33970DA AT33970B AT 33970 B AT33970 B AT 33970B AT 33970D A AT33970D A AT 33970DA AT 33970 B AT33970 B AT 33970B
Authority
AT
Austria
Prior art keywords
lithopone
resistant
production
light
hand
Prior art date
Application number
Other languages
German (de)
Inventor
Wilhelm Dr Ostwald
Eberhard Dr Brauer
Original Assignee
Wilhelm Dr Ostwald
Eberhard Dr Brauer
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 Wilhelm Dr Ostwald, Eberhard Dr Brauer filed Critical Wilhelm Dr Ostwald
Application granted granted Critical
Publication of AT33970B publication Critical patent/AT33970B/en

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  • Inorganic Compounds Of Heavy Metals (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Herstellung von lichtbeständigem Lithopon. 
 EMI1.1 
 standee Gemenge von Zinksulfid und Baryumsulfat wird getrocknet, geglüht. in   Wasser ab-   geschreckt und bildet dann in fein gemahlenem Zustande den Farbstoff. 
 EMI1.2 
   und   seiner   Unveränderlichkeit   durch Schwefelwasserstoff hat dieser Farbstoff indessen einen Fehler, den man bisher   nicht hat beseitigen können ;   er wird nämlich im   Sonnenlichte grau.   um im Dunkeln wieder seine weisse Farbe anzunehmen.

   Worauf dieser Vorgang beruht. ist noch nicht festgestellt worden ; ebenso ist es   bisher nicht möglich gewesen,   ihn   zu beseitigen.   
 EMI1.3 
 sowie Gemenge solcher Salze verwendet werden.   Ammoniaksalze   bewähren sich im allgemeinen   nicht, da sie im Laufe   der Zeit durch   Ammoni & kverlust leicht sauer werden.   
 EMI1.4 
   verwenden.   



   Es ist schon bekannt, das Lithopon mit löslichen Salzen auszuwaschen (Brit. Patentschrift Nr.   17956@1903). wobei aber ein Verdrängen der gemachten Zusäte durch Wasser stattfand,   
 EMI1.5 




   <Desc / Clms Page number 1>
 



  Process for the production of light-resistant lithopone.
 EMI1.1
 Standee mixture of zinc sulphide and barium sulphate is dried, calcined. Quenched in water and then, when finely ground, forms the dye.
 EMI1.2
   and its immutability due to hydrogen sulfide, however, this dye has a defect which it has hitherto not been able to remove; it turns gray in the sunlight. to take on its white color again in the dark.

   What this process is based on. has not yet been established; likewise it has so far not been possible to eliminate it.
 EMI1.3
 as well as mixtures of such salts can be used. Ammonia salts generally do not prove successful, as they become slightly acidic over time due to ammonia loss.
 EMI1.4
   use.



   It is already known to wash out the lithopone with soluble salts (Brit. Patent No. 17956 @ 1903). but there was a displacement of the additives made by water,
 EMI1.5

Claims (1)

PATENT-ANSPRÜCHE : 1. Verfahren zur Herstellung von lichtbeständigem Lithopon, dadurch gekennzeichnet, dass man das auf die übliche Weise hergestellte Rohprodukt einerseits mit solchen wasserlöslichen nicht sauer reagierenden Verbindungen vermahlt, die auf Zinksalzlösungen fällend wirken, oder andererseits mit Lösungen solcher Verbindungen behandelt, und in letzterem Falle, ohne dass ein Nachwaschen mit reinem Wasser erfolgt. trocknet. PATENT CLAIMS: 1. A process for the production of light-resistant lithopone, characterized in that the crude product produced in the usual way is ground on the one hand with those water-soluble non-acidic compounds which have a precipitating effect on zinc salt solutions, or on the other hand, treated with solutions of such compounds, and in the latter case, without rewashing with pure water. dries. 2. Eine Ausführungsform des Verfahrens nach Anspruch 1, darin bestehend, dass das geglühte Lithopon durch Einbringen in eine Lösung solcher Körper, welche auf Zinksalzlösungen fällend wirken, abgeschreckt und direkt getrocknet wird. 2. An embodiment of the method according to claim 1, in which the annealed lithopone is quenched and dried directly by introducing it into a solution of such bodies which have a precipitating effect on zinc salt solutions.
AT33970D 1906-03-26 1906-03-26 Process for the production of light-resistant lithopone. AT33970B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT33970T 1906-03-26

Publications (1)

Publication Number Publication Date
AT33970B true AT33970B (en) 1908-08-10

Family

ID=3549906

Family Applications (1)

Application Number Title Priority Date Filing Date
AT33970D AT33970B (en) 1906-03-26 1906-03-26 Process for the production of light-resistant lithopone.

Country Status (1)

Country Link
AT (1) AT33970B (en)

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