AT35833B - Process for the preparation of a red disazo dye. - Google Patents

Process for the preparation of a red disazo dye.

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Publication number
AT35833B
AT35833B AT35833DA AT35833B AT 35833 B AT35833 B AT 35833B AT 35833D A AT35833D A AT 35833DA AT 35833 B AT35833 B AT 35833B
Authority
AT
Austria
Prior art keywords
preparation
disazo dye
red disazo
red
dye
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
Priority claimed from DE1907196989D external-priority patent/DE196989C/de
Application filed by Farbenfab Vorm Bayer F & Co filed Critical Farbenfab Vorm Bayer F & Co
Application granted granted Critical
Publication of AT35833B publication Critical patent/AT35833B/en

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Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Darstellung eines roten Disazofarbstoffs. Tetrazofarbstoffe aus   m-Dichlorbenzidm   der Formel : 
 EMI1.1 
 und   Naphtolsulfosäuren   sind bisher noch nicht bekannt geworden. 



   Es wurde nun gefunden, dass die Kombination aus einem Molekül   M-Dichlorbenzidin   der obigen Formel und zwei Molekülen   2-Naphtol-3.   6-disulfonsäure einen sehr wertvollen licht-undwalkechtenWollfarbstoffdarstellt. 



   Beispiel. 



   253 kg Dichlorbenzidin werden tetrazotiert und die Tetrazoverbindung zu einer Lösung von 608 kg   2-Naphtol-3. 6-disulfosäure   in einem Überschuss von Sodalösung zugefügt. Die   Farbstoffbildung   ist nach kurzer Zeit beendet. Der neue Farbstoff wird ausgesalzen, abfiltriert und getrocknet. Er färbt Wolle in saurem Bade in licht-und walkechten roten Tönen an. 

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



   <Desc / Clms Page number 1>
 



  Process for the preparation of a red disazo dye. Tetrazo dyes from m-dichlorobenzide of the formula:
 EMI1.1
 and naphthol sulfonic acids have not yet become known.



   It has now been found that the combination of one molecule of M-dichlorobenzidine of the above formula and two molecules of 2-naphtol-3. 6-disulfonic acid is a very valuable light- and whale-fast wool dye.



   Example.



   253 kg of dichlorobenzidine are tetrazotized and the tetrazo compound to a solution of 608 kg of 2-naphthol-3. 6-disulfonic acid was added in an excess of soda solution. The formation of the dye ends after a short time. The new dye is salted out, filtered off and dried. He dyes wool in an acid bath in lightfast and milled red tones.

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

Claims (1)

PATENT-ANSRPUCH : Verfahren zur Darstellung eines roten Disazofarbstoffs, dadurch gekennzeichnet, dass man die Tetrazoverbindung des m-Dichlorbenzidins der Formel : EMI1.2 mit 2 Molekülen 2-Naphtol-3.6-disulfosäure kombiniert. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Process for the preparation of a red disazo dye, characterized in that the tetrazo compound of m-dichlorobenzidine of the formula: EMI1.2 combined with 2 molecules of 2-naphthol-3,6-disulfonic acid. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT35833D 1907-04-10 1908-03-14 Process for the preparation of a red disazo dye. AT35833B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1907196989D DE196989C (en) 1907-04-10

Publications (1)

Publication Number Publication Date
AT35833B true AT35833B (en) 1909-01-11

Family

ID=5756122

Family Applications (1)

Application Number Title Priority Date Filing Date
AT35833D AT35833B (en) 1907-04-10 1908-03-14 Process for the preparation of a red disazo dye.

Country Status (1)

Country Link
AT (1) AT35833B (en)

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