CH184880A - 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
CH184880A
CH184880A CH184880DA CH184880A CH 184880 A CH184880 A CH 184880A CH 184880D A CH184880D A CH 184880DA CH 184880 A CH184880 A CH 184880A
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CH
Switzerland
Prior art keywords
blue
dye
acid
preparation
gray
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 CH184880A publication Critical patent/CH184880A/en

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  Verfahren zur     Darstellung        eines        o-Ogyazofarbstoffes.       Es wurde gefunden, dass durch Kuppeln  von     diazotiertem        6-Nitro-4-methyl-2-amirro-          1-oxybenzol    reit     2-Acetylamino-6-oxynaph-          thalin-8        sulfonsäure    ein Farbstoff erhalten  wird, der durch     Nachchromieren    der in sau  rem Bade entstehenden Färbungen gleich  mässige, blaugraue Färbungen von ausge  zeichneten Echtheitseigenschaften liefet.

           Beispiel:       16,8 Teile     6-Nitro-4-methyl-2-amino-l-          oxybenzol    werden wie üblich     diazotiert    und  mit 28,4 Teilen     2-Acetylamino-6-oxynaphtba-          lin-8-sulfonsäure,    hergestellt in bekannter  Weise durch     Acetylieren    von     2-Amino-6-          oxynaphthalin-8-sulfonsäure,    in schwach     soda-          alkalischer    Lösung gekuppelt. Nach beende  ter Kupplung wird der Farbstoff     abfiltriert     und getrocknet.

   Er stellt ein schwarzes Pul  ver dar, das sich in verdünnter Essigsäure  violett, in verdünnter     Natriumkarbonatlösung     blau 'und in konzentrierter Schwefelsäure  blaurot löst. Der Farbstoff färbt Wolle aus    saurem Bade blau, beim     Nachohromieren    der  Färbung erhält man ein Blaugrau von aus  gezeichneten Echtheitseigenschaften.



  Process for the preparation of an o-ogyazo dye. It has been found that by coupling diazotized 6-nitro-4-methyl-2-amirro-1-oxybenzene with 2-acetylamino-6-oxynaphthalene-8 sulfonic acid, a dye is obtained which can be obtained by re-chroming the in acidic bath The resulting dyeings produce uniform, blue-gray dyeings with excellent fastness properties.

           Example: 16.8 parts of 6-nitro-4-methyl-2-amino-l-oxybenzene are diazotized as usual and prepared in a known manner with 28.4 parts of 2-acetylamino-6-oxynaphtbalin-8-sulfonic acid Acetylation of 2-amino-6-oxynaphthalene-8-sulfonic acid, coupled in a weakly alkaline soda solution. After the coupling has ended, the dye is filtered off and dried.

   It represents a black powder that dissolves violet in dilute acetic acid, blue in dilute sodium carbonate solution and blue-red in concentrated sulfuric acid. The dye dyes wool from an acid bath blue, and when the dyeing is followed up, a blue-gray with excellent fastness properties is obtained.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines o- Oxy- azofarbstoffes, der durch Nachchromieren der in saurem Bade entstehenden Färbungen gleichmässige blaugraue Färbungen von aus gezeichneten Echtheitseigenschaften liefert, dadurch gekennzeichnet, dass man 6-Nitro-4- methyl-2-diazo-l-oxybenzol mit 2-Acetyl- amino-6-oxynaphthalin-8-sulfonsäure kuppelt, Der neue Farbstoff stellt getrocknet ein schwarzes Pulver dar, das sich in verdünn ter Essigsäure violett, in verdünnter Natrium karbonatlösung blau und in konzentrierter Schwefelsäure blaurot löst; PATENT CLAIM: Process for the preparation of an o-oxy azo dye which, by re-chroming the dyeings in an acidic bath, provides uniform blue-gray dyeings with excellent fastness properties, characterized in that 6-nitro-4-methyl-2-diazo-1-oxybenzene is used coupled with 2-acetylamino-6-oxynaphthalene-8-sulfonic acid, the new dye is a black powder when dried, which dissolves violet in dilute acetic acid, blue in dilute sodium carbonate solution and blue-red in concentrated sulfuric acid; .er färbt Wolle aus saurem Bade blau, beim Nachchromieren der Färbung erhält man- ein Blaugrau von ausgezeichneten Echtheitseigenschaften. It dyes wool from an acid bath blue; when the dyeing is re-chromed, a blue-gray with excellent fastness properties is obtained.
CH184880D 1934-11-10 1935-08-24 Process for the preparation of an o-oxyazo dye. CH184880A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE184880X 1934-11-10
CH184880T 1935-08-24

Publications (1)

Publication Number Publication Date
CH184880A true CH184880A (en) 1936-06-30

Family

ID=25721089

Family Applications (1)

Application Number Title Priority Date Filing Date
CH184880D CH184880A (en) 1934-11-10 1935-08-24 Process for the preparation of an o-oxyazo dye.

Country Status (1)

Country Link
CH (1) CH184880A (en)

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