CH191569A - 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
CH191569A
CH191569A CH191569DA CH191569A CH 191569 A CH191569 A CH 191569A CH 191569D A CH191569D A CH 191569DA CH 191569 A CH191569 A CH 191569A
Authority
CH
Switzerland
Prior art keywords
orange
preparation
monoazo dye
new monoazo
yellow
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 CH191569A publication Critical patent/CH191569A/en

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Description

  

  Verfahren zur Herstellung eines neuen     Nonoazofarbstoffes.            Vorliegende    Erfindung betrifft die Her  stellung     eines    neuen     Monoazofarbstoffes,     welcher auf     Wolle        lebhaft    orangegelbe Töne  von ausgezeichneter Wasch- und     Walkec11t-          heit    und sehr guter Lichtbeständigkeit er  zeugt.  



  Gemäss vorliegendem Verfahren wird der       Farbstoff    hergestellt durch Kuppeln von       diazotiertem        Dodecyl-p-aminobenzoat    mit     2-          Naphtol-,6    :

       8-disulfosäure.       <I>Beispiel:</I>    80,5 Gewichtsteile     Dodecyl    - p -     amino-          benzoat        (Smp.    77 bis<B>78'</B> C) werden als       Suspension        in    250     Gewichtsteilen    Wasser  und 2,6 Gewichtsteilen     86%iger    Salzsäure  durch     Hinzufügen    von 7     Gewichtsteilen          Natriumnitrit        @diazotiert.    Die so erhaltene       Diazosuspension    wird     dann    zu einer wässe  rigen Lösung von 30,

  5     Gewichtsteilen:    2.  Naphtol-6     :8-disulfosäure    .gesetzt, die man  während des     Zusetzens    mit Soda gegen Lack  mus alkalisch hält. Der Farbstoff     wird     nötigenfalls nach voraufgegangenem Aus  salzen,     erbfiltriert    und     entweder    als Paste    aufbewahrt, oder auf     irgendeine    passende  Weise getrocknet.

   Trocken bildet er     ein        röt-          lichorangefarbenes    Pulver, welches     mit    Was  ser oder mit konzentrierter .Schwefelsäure  eine orangegelbe Lösung     ,gibt.    Er färbt  Wolle aus     2,%        Ammonazetat    enthaltendem       Bade    in lebhaft orangegelben Tönen von aus  gezeichneter Wasch- und     Walkechtheit    und  sehr guter     Lichtbeständigkeit.  



  Process for the preparation of a new nonoazo dye. The present invention relates to the manufacture of a new monoazo dye, which on wool produces vivid orange-yellow shades of excellent washing and milled properties and very good lightfastness.



  According to the present process, the dye is prepared by coupling diazotized dodecyl p-aminobenzoate with 2-naphthol, 6:

       8-disulfonic acid. <I> Example: </I> 80.5 parts by weight of dodecyl - p - amino benzoate (melting point 77 to <B> 78 '</B> C) are used as a suspension in 250 parts by weight of water and 2.6 parts by weight of 86% iger hydrochloric acid @diazotized by adding 7 parts by weight of sodium nitrite. The diazo suspension thus obtained is then converted to an aqueous solution of 30

  5 parts by weight: 2. Naphthol-6: 8-disulfonic acid, which is kept alkaline against lacquer during the addition of soda. The dye is, if necessary, salted out beforehand, filtered and either stored as a paste or dried in any convenient way.

   When dry, it forms a reddish orange powder which, when mixed with water or with concentrated sulfuric acid, gives an orange-yellow solution. It dyes wool from a bath containing 2.0% ammonium acetate in lively orange-yellow shades of excellent wash and milled fastness and very good lightfastness.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines neuen Monoazofarbstoffes, @dadurch ,gekennzeichnet, dass, man Dodecyl-p-aminobenzoat diazotiert und die Diazoverbindung mit 2:-Naphtol- 6 :8-disulfosäure kuppelt. Das Produkt ist ein rötlichorangegelbes Pulver, welches mit Wasser oder mit konzentrierter Schwefel säure eine orangegelbe Lösung gibt und Wolle in lebhaft orangegelben Tönen färbt. PATENT CLAIM: Process for the production of a new monoazo dye, characterized in that dodecyl p-aminobenzoate is diazotized and the diazo compound is coupled with 2: -naphthol- 6: 8-disulfonic acid. The product is a reddish-orange-yellow powder which, when mixed with water or with concentrated sulfuric acid, gives an orange-yellow solution and dyes wool in vivid orange-yellow tones.
CH191569D 1935-11-21 1936-11-05 Process for the preparation of a new monoazo dye. CH191569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191569X 1935-11-21

Publications (1)

Publication Number Publication Date
CH191569A true CH191569A (en) 1937-06-30

Family

ID=10124692

Family Applications (1)

Application Number Title Priority Date Filing Date
CH191569D CH191569A (en) 1935-11-21 1936-11-05 Process for the preparation of a new monoazo dye.

Country Status (1)

Country Link
CH (1) CH191569A (en)

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