CH194084A - 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
CH194084A
CH194084A CH194084DA CH194084A CH 194084 A CH194084 A CH 194084A CH 194084D A CH194084D A CH 194084DA CH 194084 A CH194084 A CH 194084A
Authority
CH
Switzerland
Prior art keywords
dye
preparation
green
oxyazo
dyeings
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 CH194084A publication Critical patent/CH194084A/en

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Description

  

  Verfahren zur Darstellung eines     o-Ogyazofarbstoffes.       Es wurde gefunden, dass durch Kuppeln  von dianotiertem     5-Nitro-2-amino-l-oxybenzol     mit     2-Phenylamino-6-oxynaphtbalin-8-sulfoii-          säure    ein Farbstoff erhalten wird, der durch       Nachchromieren    der in saurem Bade ent  stehenden Färbungen gleichmässige, graue  Färbungen von ausgezeichneten Echtheits  eigenschaften liefert.    <I>Beispiel:</I>    15,4 kg     5-Nitro-2-amino-l-oxybenzol    wer  den in üblicher Weise dianotiert.

   Die     Diazo-          lösung,    deren Mineralsäure mit     Natriumbi-          carbonat    abgestumpft wird, fliesst zu einer  Lösung von 31,5 kg     2-Phenylamino-6-oxy-          naphthalin-8-sulfonsäure,    hergestellt in be  kannter Weise durch     Phenylieren    von     2-          Amino-6-oxynaphthalin-8-sulfonsäure,    in 250  Liter Wasser, 10 kg     Natriumbicarbonat    und  100 Liter     Pyridin.     



  Nach beendeter Kupplung wird filtriert.  Der Farbstoff, ein dunkles Pulver, löst sich  in Wasser grün und in konzentrierter Schwe-         felsäure    rotviolett. Er färbt Wolle aus saurem  Bade grün. Beim     Nachchromieren    der Färbung  erhält man ein lichtechtes Grau.



  Process for the preparation of an o-ogyazo dye. It has been found that by coupling dianotized 5-nitro-2-amino-1-oxybenzene with 2-phenylamino-6-oxynaphthalene-8-sulfoic acid, a dye is obtained which is uniform by after-chromating the colorations that arise in an acid bath , provides gray dyeings with excellent fastness properties. <I> Example: </I> 15.4 kg of 5-nitro-2-amino-1-oxybenzene are dianotized in the usual way.

   The diazo solution, the mineral acid of which is truncated with sodium bicarbonate, flows into a solution of 31.5 kg of 2-phenylamino-6-oxynaphthalene-8-sulfonic acid, prepared in a known manner by phenylating 2-amino-6 -oxynaphthalene-8-sulfonic acid, in 250 liters of water, 10 kg of sodium bicarbonate and 100 liters of pyridine.



  After the coupling has ended, it is filtered. The dye, a dark powder, dissolves green in water and red-violet in concentrated sulfuric acid. He dyes wool from acid bath green. When the color is re-chromed, a lightfast gray is obtained.

Claims (1)

PATENTANSPRÜCH: Verfahren zur Darstellung eines o-Oxy- azofarbstoffes, der durch Nachchromieren der in saurem Bade entstehenden Färbungen gleichmässige graue Färbungen von ausge zeichneten Echtheitseigenschaften liefert, da durch gekennzeichnet, dass man 5-Nitro-2- diazo-l-oxybenzol mit 2-Phenylamino-6-oxy- naphthalin-8-sulfonsäure kuppelt. PATENT CLAIM: A process for the preparation of an o-oxy-azo dye which, by re-chroming the dyeings in an acidic bath, produces uniform gray dyeings with excellent fastness properties, as characterized in that 5-nitro-2-diazo-l-oxybenzene is mixed with 2- Phenylamino-6-oxynaphthalene-8-sulfonic acid couples. Der neue Farbstoff stellt getrocknet ein dunkles Pulver dar, das sich in Wasser grün und in kon zentrierter Schwefelsäure rotviolett löst; er färbt Wolle aus saurem Bade grün, beim Nachchromieren der Färbung erhält man ein Grau von ausgezeichneten Echtheitseigen schaften. When dried, the new dye is a dark powder that dissolves green in water and red-violet in concentrated sulfuric acid; it dyes wool from an acidic bath green; after chroming the dyeing, a gray with excellent fastness properties is obtained.
CH194084D 1935-08-24 1937-01-05 Process for the preparation of an o-oxyazo dye. CH194084A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH184880T 1935-08-24
DE194084X 1936-05-06

Publications (1)

Publication Number Publication Date
CH194084A true CH194084A (en) 1937-11-15

Family

ID=25721108

Family Applications (1)

Application Number Title Priority Date Filing Date
CH194084D CH194084A (en) 1935-08-24 1937-01-05 Process for the preparation of an o-oxyazo dye.

Country Status (1)

Country Link
CH (1) CH194084A (en)

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