CH148979A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH148979A
CH148979A CH148979DA CH148979A CH 148979 A CH148979 A CH 148979A CH 148979D A CH148979D A CH 148979DA CH 148979 A CH148979 A CH 148979A
Authority
CH
Switzerland
Prior art keywords
preparation
azo dye
fastness
dye
produced
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
Original Assignee
Ig Farbenindustrie Ag
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 Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Publication of CH148979A publication Critical patent/CH148979A/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

  Verfahren zur     Darstellung    eines     Azofarbstoffes.       Gegenstand der vorliegenden Erfindung  ist ein Verfahren zur Darstellung eines     Azo-          farbstoffes,        welches    dadurch gekennzeichnet  ist, dass man die     Diazoverbindung    von     5-Chlor-          2-aminobenzoesäuremethylester    mit 2 .     3-Oxy-          naphtoesäure-alpb.a-naphtylamid    kuppelt. Die  Einwirkung der beiden Komponenten aufein  ander kann auch in Gegenwart eines Sub  strates erfolgen.  



  Der in- Substanz hergestellte Farbstoff  bildet ein rotes Pulver und liefert, wenn auf  der Faser erzeugt, ein lebhaftes Rot von  sehr guter Lichtechtheit, Waschechtheit und  guter     Laugenkochechtheit.     



  <I>Beispiel:</I>  18,5 Gewichtsteile     5-Chlor-2-aminobenzoe-          säuremethylester    werden in bekannter Weise  mit Salzsäure und     Natriumnitrit        diazotiert.     Die nötigenfalls filtrierte     Diazolösung    wird  bei 0   bis 5   C     rnit    einer     ätzalkalischen     wässerigen Lösung von 31,3 Gewichtsteilen  2 .     3-Oxynaphtoesäure-alpha-naphtylamid    ver  einigt. Der     Farbstoff    fällt sofort in Form    roter Flocken aus. Nach dem Filtrieren wird  mit Wasser gewaschen und getrocknet.

   Die  Darstellung des     Farbstoffes    kann auch in  Gegenwart eines Substrates erfolgen. Wird  der Farbstoff auf der Faser erzeugt, so erhält  man ein lebhaftes Rot von sehr guter Licht  echtheit; Waschechtheit und guter Laugen  kochechtheit.



  Process for the preparation of an azo dye. The present invention relates to a process for the preparation of an azo dye, which is characterized in that the diazo compound of 5-chloro-2-aminobenzoic acid methyl ester with 2. 3-oxynaphthoic acid alpb.a-naphthylamide couples. The action of the two components on one another can also take place in the presence of a substrate.



  The dyestuff produced in substance forms a red powder and, when produced on the fiber, provides a vivid red with very good fastness to light, fastness to washing and good fastness to lye boiling.



  <I> Example: </I> 18.5 parts by weight of 5-chloro-2-aminobenzoic acid methyl ester are diazotized in a known manner with hydrochloric acid and sodium nitrite. The diazo solution, filtered if necessary, is mixed at 0 to 5 C with a caustic alkaline aqueous solution of 31.3 parts by weight of 2. 3-oxynaphthoic acid-alpha-naphthylamide united. The dye immediately precipitates in the form of red flakes. After filtering, it is washed with water and dried.

   The preparation of the dye can also take place in the presence of a substrate. If the dye is produced on the fiber, a vivid red with very good light fastness is obtained; Washfastness and good lye fastness to boil.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man die Diazoverbindung von 5-Chlor-2-aminobenzoe- säuremethylester mit 2.3-Oxynaphtoesäure- alpha-naphtylamid kuppelt. Der in Substanz hergestellte Farbstoff bildet ein rotes Pulver und liefert, wenn auf der Faser erzeugt, ein lebhaftes Rot von sehr guter Lichtechtheit, Waschechtheit und guter Laugenkochechtheit. PATENT CLAIM: Process for the preparation of an azo dye, characterized in that the diazo compound of 5-chloro-2-aminobenzoic acid methyl ester is coupled with 2,3-oxynaphthoic acid-alpha-naphthylamide. The dye, which is produced in substance, forms a red powder and, when produced on the fiber, provides a vivid red with very good fastness to light, fastness to washing and good fastness to lye boiling.
CH148979D 1928-09-18 1929-09-13 Process for the preparation of an azo dye. CH148979A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE148979X 1928-09-18
CH145153T 1929-09-13

Publications (1)

Publication Number Publication Date
CH148979A true CH148979A (en) 1931-08-15

Family

ID=25714617

Family Applications (1)

Application Number Title Priority Date Filing Date
CH148979D CH148979A (en) 1928-09-18 1929-09-13 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH148979A (en)

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