CH201858A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH201858A
CH201858A CH201858DA CH201858A CH 201858 A CH201858 A CH 201858A CH 201858D A CH201858D A CH 201858DA CH 201858 A CH201858 A CH 201858A
Authority
CH
Switzerland
Prior art keywords
azo dye
preparation
diphenylamine
bromo
nitro
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
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
Publication of CH201858A publication Critical patent/CH201858A/en

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Description

  

  Verfahren zur Herstellung eines     Azofarbstoffes.       Gemäss dem im     Hauptpatent    beschrie  benen Verfahren erhält man     einen    Leder     in     braunen Tönen färbenden     Azofarbstoff,    wenn  man     2-1Vlethyl-6-brom-4-nitro-l-aminobenzol          diazotiert    und die     Diazoverbindung    mit     Di-          phenylamin-2-carbon-2'-sulfosäure    kuppelt.  



  Wie nun weiter     gefunden    wurde, erhält  man     einen        Azofarbstoff    von ganz ähnlichen  Eigenschaften, wenn man     2-Ami.no-3-brom-          5-nitro-l-benzylsulfosäure        diazotiert    und die       Diazoverbindung    mit     Diphenylamin-2.        2'-di-          carbonsäure    kuppelt.  



       Beispiel:     311 Gewichtsteile     2-Amino-3-brom-5-nitro-          1    -     benzylsulfonsäure    werden mit     Nitrosyl-          schwefelsäure    diazoniert und zu einer Lösung  des     Natriumsalzes    von 260     Teilen        Diphenyl-          amin-2.        2'-dicarbonsäure    in Wasser, der noch    250 Gewichtsteile     Natriumacetat    zugesetzt       sind,    gegeben. Nach beendeter Kupplung  wird der Farbstoff     ausgesalzen,    abgesaugt,  gewaschen und getrocknet.

   Der leicht wasser  lösliche Farbstoff färbt Chromkalbleder rot  braun. Die     Färbung    zeigt sehr gute     Echt-          ]leiten.  



  Process for the preparation of an azo dye. According to the process described in the main patent, an azo dye which dyes leather in brown shades is obtained if 2-1Vlethyl-6-bromo-4-nitro-1-aminobenzene is diazotized and the diazo compound is treated with diphenylamine-2-carbon-2'- sulfonic acid couples.



  As has now been further found, an azo dye with very similar properties is obtained if 2-amino-3-bromo-5-nitro-1-benzylsulfonic acid is diazotized and the diazo compound is diazotized with diphenylamine-2. 2'-dicarboxylic acid couples.



       Example: 311 parts by weight of 2-amino-3-bromo-5-nitro-1-benzylsulfonic acid are diazonated with nitrosylsulfuric acid and form a solution of the sodium salt of 260 parts of diphenylamine-2. 2'-dicarboxylic acid in water to which 250 parts by weight of sodium acetate have been added. When the coupling is complete, the dye is salted out, filtered off with suction, washed and dried.

   The easily water-soluble dye dyes chrome calfskin red brown. The coloring shows very good fast] conductors.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man 2- Amino-3-brom-5-nitro-l-benzylsulfosäure di- azoniert und die Diazoverbindung mit Di- phenylamin-2. 2'-dicarbonsäure kuppelt. Der so erhaltene, leicht wasserlösliche Farbstoff färbt Chromkalbleder rotbraun. Claim: Process for the production of an azo dye, characterized in that 2-amino-3-bromo-5-nitro-1-benzylsulfonic acid is diaconated and the diazo compound with diphenylamine-2. 2'-dicarboxylic acid couples. The easily water-soluble dye obtained in this way dyes chrome calfskin red-brown.
CH201858D 1936-08-26 1937-05-14 Process for the preparation of an azo dye. CH201858A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201858X 1936-08-26
CH198711T 1938-07-15

Publications (1)

Publication Number Publication Date
CH201858A true CH201858A (en) 1938-12-15

Family

ID=25723123

Family Applications (1)

Application Number Title Priority Date Filing Date
CH201858D CH201858A (en) 1936-08-26 1937-05-14 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH201858A (en)

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