CH194952A - 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
CH194952A
CH194952A CH194952DA CH194952A CH 194952 A CH194952 A CH 194952A CH 194952D A CH194952D A CH 194952DA CH 194952 A CH194952 A CH 194952A
Authority
CH
Switzerland
Prior art keywords
preparation
monoazo dye
new monoazo
yellow
dye
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 CH194952A publication Critical patent/CH194952A/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     grünlichgelbe    Töne erzeugt,  die intensivem Waschen, Walken und Licht  ausgezeichnet widerstehen.  



  Gemäss vorliegendem Verfahren wird der       Farbstoff    hergestellt durch Kuppeln von     di-          azoLiertem        Dodecyl-p-aminobenzoat    mit<B>1-</B>  (2': 5'-     Dichlor-4'-sulfophenyl)-3-methyl-5-pyr-          azolon.     



       .Beispiel:     30,5 Gewichtsteile     Dodecyl-p        aminobenzoat,     suspendiert in 250 Gewichtsteilen Wasser und  26 Gewichtsteilen     36o/oiger        Salzsäure,    wer  den durch Hinzufügen von 7 Gewichtsteilen       Natriumnitrit        diazotiert.    Die so erhaltene     Di-          azosuspension    setzt man zu einer gekühlten,  wässerigen Lösung von 32,3 Gewichtsteilen       1-(2':

          5'-Dichlor-4'-        sulfophenyl)    -3     -methyl-5-          pyrazolon,    welche während des     Zusetzens    mit  tels Soda gegen Lackmus alkalisch gehalten  wird. Nach vollendeter Kupplung hat das  Kupplungsgemisch anfänglich das Aussehen  einer dünnen Gallerte. Nach Zugeben von       5'/o    Kochsalz (Gewicht für Volumen) und    mehrstündigem     Rühren    scheidet sich indessen  der     Farbstoff    in körniger Form aus. Er wird       abfiltriert    und getrocknet. Im trockenen Zu  stande bildet der neue     Farbstoff    ein gelbes  Pulver.

   Er gibt sowohl mit heissem Wasser,  als auch mit Schwefelsäure eine gelbe     Lö-          sung.        Auf        Wolle        erzeugt        er        in    2     %        Ammon-          acetat    enthaltendem Bade     grünlichgelbe    Töne  von ausgezeichneter Beständigkeit gegen in  tensives Waschen, Walken und Licht.



  Process for the preparation of a new monoazo dye. The present invention relates to the Her position of a new monoazo dye, wel cher produces greenish-yellow tones on wool that withstand intensive washing, fulling and light excellently.



  According to the present process, the dye is prepared by coupling di-azoLated dodecyl-p-aminobenzoate with 1- (2 ': 5'-dichloro-4'-sulfophenyl) -3-methyl-5-pyr - azolone.



       Example: 30.5 parts by weight of dodecyl-p aminobenzoate, suspended in 250 parts by weight of water and 26 parts by weight of 36% hydrochloric acid, who diazotized by adding 7 parts by weight of sodium nitrite. The diazo suspension obtained in this way is added to a cooled, aqueous solution of 32.3 parts by weight of 1- (2 ':

          5'-dichloro-4'-sulfophenyl) -3 -methyl-5-pyrazolone, which is kept alkaline against litmus during the addition by means of soda. After the coupling is complete, the coupling mixture initially has the appearance of a thin jelly. After adding 5% sodium chloride (weight for volume) and stirring for several hours, the dye separates out in granular form. It is filtered off and dried. When dry, the new dye forms a yellow powder.

   It gives a yellow solution both with hot water and with sulfuric acid. On wool, in baths containing 2% ammonium acetate, it creates greenish-yellow tones with excellent resistance to intensive washing, fulling and light.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines neuen Monoazofarbstoffes, dadurch gekennzeichnet, dass man Dodecyl-p-aminobenzoat diazotiert und die diazotierte Verbindung mit 7-(2':5'- Dichlor-4'-sulfophenyl)-3-methyl- 5 - pyrazolon kuppelt. Das Produkt stellt ein gelbes Pulver dar, das sich in heissem Wasser, oder in konzentrierter Schwefelsäure mit gelber Farbe löst und auf Wolle grünlichgelbe Töne er zeugt. PATENT CLAIM: A process for the preparation of a new monoazo dye, characterized in that dodecyl p-aminobenzoate is diazotized and the diazotized compound is coupled with 7- (2 ': 5'-dichloro-4'-sulfophenyl) -3-methyl-5-pyrazolone . The product is a yellow powder that dissolves in hot water or concentrated sulfuric acid with a yellow color and produces greenish-yellow tones on wool.
CH194952D 1935-11-21 1936-11-05 Process for the preparation of a new monoazo dye. CH194952A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB194952X 1935-11-21
CH191569T 1936-11-05

Publications (1)

Publication Number Publication Date
CH194952A true CH194952A (en) 1937-12-31

Family

ID=25722145

Family Applications (1)

Application Number Title Priority Date Filing Date
CH194952D CH194952A (en) 1935-11-21 1936-11-05 Process for the preparation of a new monoazo dye.

Country Status (1)

Country Link
CH (1) CH194952A (en)

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