CH194949A - Process for the preparation of a new monoazo dye. - Google Patents

Process for the preparation of a new monoazo dye.

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Publication number
CH194949A
CH194949A CH194949DA CH194949A CH 194949 A CH194949 A CH 194949A CH 194949D A CH194949D A CH 194949DA CH 194949 A CH194949 A CH 194949A
Authority
CH
Switzerland
Prior art keywords
preparation
orange
monoazo dye
dye
scarlet
Prior art date
Application number
Other languages
German (de)
Inventor
Limited Imperial Ch Industries
Original Assignee
Ici Ltd
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 Ici Ltd filed Critical Ici Ltd
Publication of CH194949A publication Critical patent/CH194949A/en

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Description

  

  Verfahren zur Herstellung eines neuen     Monoazofarbstoffes.       Vorliegende Erfindung     betrifft    die Her  stellung eines neuen     Monoazofarbstoffes,    wel  cher auf Wolle lebhaft     rötlich-orangefarbene     Töne von ausgezeichneter Wasch- und     Walk-          echtheit    und sehr guter Lichtbeständigkeit  erzeugt.  



  Gemäss vorliegendem Verfahren wird der  Farbstoff durch Kuppeln von dianotiertem       Dodecyl-3-amino-4-methoxy-l-benzoat    mit       2-Naphtol-6:8-disulfosäure    erhalten.    <I>Beispiel:</I>    Eine Suspension von 33,5 Gewichtsteilen       Dodecyl-3-amino-4-methoxy-l-benzoat        (Smp.     500C) in 250 Gewichtsteilen Wasser und       26        Gewichtstölen        36        %iger        Salzsäure        wird     durch Hinzufügen von 6,9 Gewichtsteilen       Natriumnitrit    dianotiert.

   Die so erhaltene Lö  sung der     Diazoverbindung    setzt man, nötigen  falls nach voraufgegangenem Filtrieren, zu  einer gekühlten, wässerigen Lösung (5 0 C)    von 30,5 Gewichtsteilen     2-Naphtol-6    :     8-disulfo-          säure,    welche während des     Zusetzens    mittels  Soda gegen Lackmus alkalisch gehalten wird.

    Der gebildete Farbstoff ist anfänglich gela  tinös, scheidet sich aber nach Beigabe von  Salz und 20 bis 30     stündigem    Rühren in       filtrierbarem    Zustande aus, worauf man ihn       abfiltriert,        mit        10        %igem        Salzwasser        wäscht     und trocknet. Trocken stellt er ein scharlach  rotes Pulver dar, welches mit kaltem Wasser  eine orangefarbene, mit konzentrierter Schwe  felsäure eine scharlachrote Lösung gibt.

   Der       neue        Farbstoff        färbt        Wolle        aus    2     %        Ammon-          azetat    enthaltendem Bade in lebhaft rötlich  orangegelben Tönen von ausgezeichneter  Wasch- und     Walkechtheit    und sehr guter  Lichtbeständigkeit.



  Process for the preparation of a new monoazo dye. The present invention relates to the manufacture of a new monoazo dye which produces vivid reddish-orange shades of excellent wash and milled fastness and very good lightfastness on wool.



  According to the present process, the dye is obtained by coupling dianotized dodecyl 3-amino-4-methoxy-1-benzoate with 2-naphthol-6: 8-disulfonic acid. <I> Example: </I> A suspension of 33.5 parts by weight of dodecyl 3-amino-4-methoxy-1-benzoate (melting point 500C) in 250 parts by weight of water and 26 parts by weight of 36% hydrochloric acid is obtained by adding 6 , 9 parts by weight of sodium nitrite dianotized.

   The solution of the diazo compound obtained in this way is added, if necessary after previous filtration, to a cooled, aqueous solution (5 ° C.) of 30.5 parts by weight of 2-naphthol-6: 8-disulfonic acid, which during the addition by means of soda is kept alkaline against litmus.

    The dye formed is initially gelatinous, but after adding salt and stirring for 20 to 30 hours it separates out in a filterable state, whereupon it is filtered off, washed with 10% salt water and dried. When dry, it is a scarlet red powder, which gives an orange-colored solution with cold water and a scarlet-red solution with concentrated sulfuric acid.

   The new dye dyes wool from baths containing 2% ammonium acetate in bright reddish orange-yellow shades of excellent wash and milled fastness and very good lightfastness.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines neuen AZonoazofarbstoffes, dadurch gekennzeichnet, dass rnan Dodecyl-3-amino-4-cnetboxy-l-ben- zoat dianotiert und die Diazoverbindung mit 2-Naphtol-6:8-disulfosäure kuppelt. Das Pro dukt stellt ein scharlachrotes Pulver dar, welches mit kaltem Wasser eine orangefar- bene, mit konzentrierter Schwefelsäure eine scharlachrote Lösung gibt und Wolle in leb haft rötlich-orangegelben Tönen färbt. PATENT CLAIM: Process for the production of a new azoazo dye, characterized in that dodecyl-3-amino-4-cnetboxy-1-benzoate is dianotated and the diazo compound is coupled with 2-naphthol-6: 8-disulfonic acid. The product is a scarlet-red powder which, with cold water, gives an orange-colored solution, and with concentrated sulfuric acid a scarlet-red solution and colors wool in vivid reddish-orange-yellow tones.
CH194949D 1935-11-21 1936-11-05 Process for the preparation of a new monoazo dye. CH194949A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB194949X 1935-11-21
CH191569T 1936-11-05

Publications (1)

Publication Number Publication Date
CH194949A true CH194949A (en) 1937-12-31

Family

ID=25722142

Family Applications (1)

Application Number Title Priority Date Filing Date
CH194949D CH194949A (en) 1935-11-21 1936-11-05 Process for the preparation of a new monoazo dye.

Country Status (1)

Country Link
CH (1) CH194949A (en)

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