AT48903B - Process for the preparation of yellow dyes. - Google Patents

Process for the preparation of yellow dyes.

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Publication number
AT48903B
AT48903B AT48903DA AT48903B AT 48903 B AT48903 B AT 48903B AT 48903D A AT48903D A AT 48903DA AT 48903 B AT48903 B AT 48903B
Authority
AT
Austria
Prior art keywords
preparation
yellow dyes
acid
phenylhydrazine
mixture
Prior art date
Application number
Other languages
German (de)
Original Assignee
Farbenfab Vorm Bayer F & Co
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 Farbenfab Vorm Bayer F & Co filed Critical Farbenfab Vorm Bayer F & Co
Application granted granted Critical
Publication of AT48903B publication Critical patent/AT48903B/en

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Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Darstellung von gelben Farbstoffen. 
 EMI1.1 
 



   Es wurde gefunden, dass man zu gelben Farbstoffen dadurch gelangen kann, dass man Dioxyweinsäure mit 2 Molekülen   Phenylbydrazinorthosulfosäure   oder einem Gemisch dieser Säure mit der   Phenylhydrazin-p-sulfosäure   kondensiert. 



   Die so erhaltenen neuen Farbstoffe sind bedeutend grünstichiger und lichtechter als Tartrazin, auch egalisieren sie besser als dieser Farbstoff. Sie eignen sich ferner in hervorragender Weise zur Herstellung von Farblacken, die sich durch ihre gute Lichtechtheit und ihre klaren grünstichigen Nuancen auszeichnen 
Beispiel. 
 EMI1.2 
 und mit 60 Teilen Schwefelsäure von   600 Bé   versetzt. Zu dieser Mischung fügt man dann unter Rühren 106 Teile dioxyweinsaures Natrium hinzu, bringt das Reaktionsgemisch nach einstündigem Rühren   allmählich   zum Kochen und kocht zwei Stunden lang. Hierauf wird die Farbstoffsäure durch Zusatz von   225   Teilen Kochsalz in schön kristallinischer Form ausgefällt und erkalten gelassen. 
 EMI1.3 
 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Process for the preparation of yellow dyes.
 EMI1.1
 



   It has been found that yellow dyes can be obtained by condensing dioxytartaric acid with 2 molecules of phenylbydrazine orthosulfonic acid or a mixture of this acid with phenylhydrazine-p-sulfonic acid.



   The new dyes obtained in this way are significantly greener and more lightfast than tartrazine, and they level out better than this dye. They are also extremely suitable for the production of colored lacquers which are distinguished by their good lightfastness and their clear greenish nuances
Example.
 EMI1.2
 and 60 parts of sulfuric acid of 600 Bé are added. 106 parts of sodium dioxy-tartaric acid are then added to this mixture with stirring, and after stirring for one hour, the reaction mixture is gradually brought to the boil and boiled for two hours. The dyestuff acid is then precipitated in a nicely crystalline form by adding 225 parts of common salt and allowed to cool.
 EMI1.3
 

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims (1)

PATENT-ANSPRUCH : Verfahren zur Darstellung von gelben Farbstoffen der Pyrazolonreihe aus Dyoxiwein- EMI1.4 Phenylhydrazin-o-sulfosäure oder einem Gemisch dieser Säure mit der Phenylhydrazin-p-sulfo- säure kondensiert. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Process for the preparation of yellow dyes of the pyrazolone series from Dyoxiwein- EMI1.4 Phenylhydrazine-o-sulfonic acid or a mixture of this acid condensed with the phenylhydrazine-p-sulfonic acid. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT48903D 1909-01-18 1909-12-29 Process for the preparation of yellow dyes. AT48903B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE48903X 1909-01-18

Publications (1)

Publication Number Publication Date
AT48903B true AT48903B (en) 1911-07-10

Family

ID=5626139

Family Applications (1)

Application Number Title Priority Date Filing Date
AT48903D AT48903B (en) 1909-01-18 1909-12-29 Process for the preparation of yellow dyes.

Country Status (1)

Country Link
AT (1) AT48903B (en)

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