CH187332A - Process for the preparation of an o-oxyazo dye. - Google Patents

Process for the preparation of an o-oxyazo dye.

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Publication number
CH187332A
CH187332A CH187332DA CH187332A CH 187332 A CH187332 A CH 187332A CH 187332D A CH187332D A CH 187332DA CH 187332 A CH187332 A CH 187332A
Authority
CH
Switzerland
Prior art keywords
dye
acid
preparation
sulfonic acid
olive
Prior art date
Application number
Other languages
German (de)
Inventor
A-G J R Geigy
Original Assignee
Geigy Ag J R
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 Geigy Ag J R filed Critical Geigy Ag J R
Publication of CH187332A publication Critical patent/CH187332A/en

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  Verfahren zur     Darstellung    eines     o-Ogyazofarbstoffes.       Es wurde gefunden, dass durch Kuppeln  von     diazotierter        4-Nitro-2-amino-l-oxyben-          zol-6-sulfonsäure    mit     2-Benzoylamino-6-oxy-          naphthalin-8-sulfonsäure    ein Farbstoff er  halten wird, der durch     Nachehromieren    der  in saurem Bade entstehenden Färbungen  gleichmässige,     olive    Färbungen von ausge  zeichneten Echtheitseigenschaften liefert.  



  <I>Beispiel:</I>  23,4 kg     4-Nitro-2-amino-l-oxybenzol-6-          sulfonsäure    werden wie üblich     diazotiert.    Die       Diazolösung    gibt man zu einer     sodaalkali-          schen    Lösung von 34,3 kg     2-Benzoylamino-6-          oxynaphthalin-8=sulfonsäure,    hergestellt in  bekannter     Weise    durch     Benzoylieren    von     2-          Amino-6-oxynaphthalin-8-sulfonsäure    in Ge  genwart von     Natriumacetat.    Nach beendeter  Kupplung wird filtriert.

   Der Farbstoff, ein  schwarzes Pulver, löst sich in Wasser essig  sauer rot,     sodaalkalisch    violett und in kon  zentrierter Schwefelsäure blaurot. Er färbt    Wolle aus saurem Bade blau. Die     nachchro-          mierte    Färbung ist olive. Sie besitzt sehr  gute Echtheitseigenschaften.



  Process for the preparation of an o-ogyazo dye. It has been found that by coupling diazotized 4-nitro-2-amino-1-oxyben- zene-6-sulfonic acid with 2-benzoylamino-6-oxynaphthalene-8-sulfonic acid, a dye is obtained that can be obtained by repeating the The dyeing produced in an acid bath provides uniform, olive dyeings with excellent fastness properties.



  <I> Example: </I> 23.4 kg of 4-nitro-2-amino-1-oxybenzene-6-sulfonic acid are diazotized as usual. The diazo solution is added to a soda-alkaline solution of 34.3 kg of 2-benzoylamino-6-oxynaphthalene-8-sulfonic acid, prepared in a known manner by benzoylating 2-amino-6-oxynaphthalene-8-sulfonic acid in the presence of sodium acetate . After the coupling has ended, it is filtered.

   The dye, a black powder, dissolves in water, acidic red, soda-alkaline violet and, in concentrated sulfuric acid, bluish red. He dyes wool from acid bath blue. The chromed color is olive. It has very good fastness properties.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines o-Oxy- a.zofarbstoffes, der durch Nachchromieren der in saurem Bade entstehenden Färbungen gleichmässige olive Färbungen von ausge zeichneten Echtheitseigenschaften liefert, da durch gekennzeichnet, dass man 4-Nitro-2- diazo-l-oxybenzol-6-sulfonsäure mit 2-Ben- zoylamino - 6 - oxynaphthalin - 8 - sulfonsäure kuppelt. PATENT CLAIM: A process for the preparation of an o-oxy-a.zo dye which, by re-chroming the dyeings produced in an acid bath, provides uniform olive dyeings with excellent fastness properties, as characterized in that 4-nitro-2-diazo-l-oxybenzene 6-sulfonic acid couples with 2-benzoylamino - 6 - oxynaphthalene - 8 - sulfonic acid. Der neue Farbstoff stellt getrocknet ein schwarzes Pulver dar, das sich in ver dünnter Essigsäure rot, in verdünnter Na triumkarbonatlösung violett und in konzen-_ trierter Schwefelsäure blaurot löst; er färbt Wolle aus saurem Bade blau, beim Nach- chromieren der Färbung erhält man ein Olive von ausgezeichneten Echtheitseigenschaften. The new dye is a black powder when dried, which dissolves red in dilute acetic acid, purple in dilute sodium carbonate solution and bluish red in concentrated sulfuric acid; it dyes wool from an acid bath blue; if the dyeing is re-chromed, an olive with excellent fastness properties is obtained.
CH187332D 1934-11-10 1935-08-24 Process for the preparation of an o-oxyazo dye. CH187332A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE187332X 1934-11-10
CH184880T 1935-08-24

Publications (1)

Publication Number Publication Date
CH187332A true CH187332A (en) 1936-10-31

Family

ID=25721091

Family Applications (1)

Application Number Title Priority Date Filing Date
CH187332D CH187332A (en) 1934-11-10 1935-08-24 Process for the preparation of an o-oxyazo dye.

Country Status (1)

Country Link
CH (1) CH187332A (en)

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