CH302037A - Process for the preparation of a chromable disazo dye. - Google Patents

Process for the preparation of a chromable disazo dye.

Info

Publication number
CH302037A
CH302037A CH302037DA CH302037A CH 302037 A CH302037 A CH 302037A CH 302037D A CH302037D A CH 302037DA CH 302037 A CH302037 A CH 302037A
Authority
CH
Switzerland
Prior art keywords
chromable
disazo dye
parts
preparation
oxynaphthalene
Prior art date
Application number
Other languages
German (de)
Inventor
Ag Sandoz
Original Assignee
Ag Sandoz
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 Ag Sandoz filed Critical Ag Sandoz
Publication of CH302037A publication Critical patent/CH302037A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B35/00—Disazo and polyazo dyes of the type A<-D->B prepared by diazotising and coupling
    • C09B35/02—Disazo dyes
    • C09B35/039—Disazo dyes characterised by the tetrazo component
    • C09B35/04—Disazo dyes characterised by the tetrazo component the tetrazo component being a benzene derivative

Description

  

  <B>Zusatzpatent</B> zum Hauptpatent Nr. 297842.    Verfahren zur     Herstellung        eines        ehromierbaren        Disazofarbatoffes.       Gegenstand des vorliegenden Patentes ist  ein Verfahren zur Herstellung eines     chromier-          baren        Disazofarbstoffes,    welches darin besteht,  dass man 1     Mol    der     Diazoverbindung    aus- der  durch Kuppeln von     diazotiertem        Aminobenzol     mit     Oxybenzol,

      anschliessendes Nitrieren des       llonoazokörpers    und Reduzieren der     Nitro-          gruppe    zur     Aminogruppe    erhältlichen     Amino-          monoazoverbindung    mit 1.     Mol        2-Oxynaph-          thalin-4-sulfonsäure    kuppelt.  



  Im nachfolgenden Beispiel bedeuten die  Teile Gewichtsteile.  



  <I>Beispiel:</I>  21,3 Teile der durch Kuppeln von     diazo-          tiertem        Aminobenzol    mit     Oxybenzol,    anschlie  ssendes Nitrieren des     Monoazokörpers    und  Reduzieren der Nitrogruppe zur     Aminogruppe     erhältlichen     Aminomonoazoverbindung    wer  den in 200 Teilen Wasser     und    4 Teilen Na  triumhydroxyd gelöst. Man versetzt die Lö  sung mit 6,9 Teilen     Natriumnitrit    und tropft  sie bei 0-l0  in eine Mischung von 36 Teilen  konzentrierter Salzsäure und 100 Teilen Eis  wasser.

   Den isolierten     Diazokörper    trägt man  unter Eiskühlung in eine Lösung von 22,4 Tei  len     2-Oxynaphthalin-4-sulfonsäure    und 6 Tei  len     Natriumhydroxyd    in 200 Teilen Wasser  und 20 Teilen     Pyridin    ein. Sobald die Bildung    des     Disazofarbstoffes        beendigt    ist, wird dieser  mit     Natriumchlorid    aus der     Kupphmgsmasse     abgeschieden,     abfiltriert    und     getrocknet.     



  Der neue     chromierbare        Disazofarbstoff    ist  ein dunkles Pulver, das sieh in     verdünnter          Sodalösung    mit violetter, in konzentrierter  Schwefelsäure mit grüner Farbe löst und  Wolle     naehchromiert    und     metachrom    in neu  tralen grauen Tönen von vorzüglicher     Licht-          und    guten     Nassechtheiten    färbt.



  <B> Additional patent </B> to the main patent No. 297842. Process for the production of an honorable disazo carbate. The subject matter of the present patent is a process for the preparation of a chromable disazo dye, which consists in that 1 mol of the diazo compound is obtained from the coupling of diazotized aminobenzene with oxybenzene,

      subsequent nitration of the ionoazo body and reduction of the nitro group to the amino group of the available amino monoazo compound with 1 mole of 2-oxynaphthalene-4-sulfonic acid.



  In the following example, the parts are parts by weight.



  <I> Example: </I> 21.3 parts of the aminomonoazo compound obtainable by coupling diazo-tated aminobenzene with oxybenzene, then nitrating the monoazo body and reducing the nitro group to the amino group are dissolved in 200 parts of water and 4 parts of sodium hydroxide. 6.9 parts of sodium nitrite are added to the solution and they are added dropwise to a mixture of 36 parts of concentrated hydrochloric acid and 100 parts of ice water at 0-10.

   The isolated diazo body is introduced into a solution of 22.4 parts of 2-oxynaphthalene-4-sulfonic acid and 6 parts of sodium hydroxide in 200 parts of water and 20 parts of pyridine, while cooling with ice. As soon as the formation of the disazo dye has ended, it is separated from the copper with sodium chloride, filtered off and dried.



  The new chromable disazo dye is a dark powder that dissolves in a dilute soda solution with a violet color, in concentrated sulfuric acid with a green color, and then chromates wool and dyes it metachromically in neutral gray tones of excellent light and good wet fastness properties.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines chromier- baren Disazofarbstoffes, dadurch gekennzeich net, dass man 1 Mol der Diazoverbindung aus der durch Kuppeln von diazotiertem Amino- benzol mit Oxybenzol, anschliessendes Nitrie ren des Monoazokörpers und Reduzieren der Nitrogruppe zur Aminogruppe erhältlichen Aminomonoazoverbindung mit 1. PATENT CLAIM: A process for the production of a chromable disazo dye, characterized in that 1 mol of the diazo compound is obtained from the aminomonoazo compound obtainable by coupling diazotized aminobenzene with oxybenzene, then nitriding the monoazo body and reducing the nitro group to the amino group with 1. Mol 2-Oxy- naphthalin-4-sulfonsäurekuppelt. Der neue chromierbare Disazofarbstoff ist ein dunkles Pulver, das sich in verdünnter Sodalösung mit violetter, in konzentrierter Schwefelsäure mit grüner Farbe löst und Wolle nachchromiert und metachrom in neu tralen grauen Tönen von vorzüglicher Licht- und guten Nassechtheiten färbt. 2-oxynaphthalene-4-sulfonic acid coupled. The new chromable disazo dye is a dark powder that dissolves in a dilute soda solution with violet color, in concentrated sulfuric acid with green color and re-chromates wool and dyes it metachromically in neutral gray tones with excellent light and good wet fastness properties.
CH302037D 1951-09-04 1951-09-04 Process for the preparation of a chromable disazo dye. CH302037A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH302037T 1951-09-04
CH297842T 1953-01-21

Publications (1)

Publication Number Publication Date
CH302037A true CH302037A (en) 1954-09-30

Family

ID=25733876

Family Applications (1)

Application Number Title Priority Date Filing Date
CH302037D CH302037A (en) 1951-09-04 1951-09-04 Process for the preparation of a chromable disazo dye.

Country Status (1)

Country Link
CH (1) CH302037A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994004613A1 (en) * 1992-08-14 1994-03-03 Zeneca Limited Watersoluble disazodyes for dyeing leather

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994004613A1 (en) * 1992-08-14 1994-03-03 Zeneca Limited Watersoluble disazodyes for dyeing leather

Similar Documents

Publication Publication Date Title
CH238459A (en) Process for the preparation of a copper-compatible polyazo dye.
CH302037A (en) Process for the preparation of a chromable disazo dye.
CH302036A (en) Process for the preparation of a chromable disazo dye.
CH302034A (en) Process for the preparation of a chromable disazo dye.
CH302033A (en) Process for the preparation of a chromable disazo dye.
CH302038A (en) Process for the preparation of a chromable disazo dye.
CH302035A (en) Process for the preparation of a chromable disazo dye.
CH253649A (en) Process for the preparation of an azo dye.
CH259329A (en) Process for the preparation of an azo dye.
CH263513A (en) Process for the preparation of an azo dye.
CH263514A (en) Process for the preparation of an azo dye.
CH263517A (en) Process for the preparation of an azo dye.
CH272156A (en) Process for the production of a copper-containing dye.
CH263516A (en) Process for the preparation of an azo dye.
CH258758A (en) Process for the preparation of an azo dye.
CH129482A (en) Process for the production of a new azo dye.
CH263518A (en) Process for the preparation of an azo dye.
CH227352A (en) Process for the preparation of a trisazo dye.
CH192047A (en) Process for the production of a new azo dye.
CH300450A (en) Process for the preparation of an acidic monoazo dye.
CH305335A (en) Process for the production of a copper-containing trisazo dye.
CH237723A (en) Process for the preparation of a new monoazo dye.
CH192985A (en) Process for the production of a new azo dye.
CH263515A (en) Process for the preparation of an azo dye.
CH243000A (en) Process for the preparation of a copper-compatible polyazo dye.