CH183876A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH183876A
CH183876A CH183876DA CH183876A CH 183876 A CH183876 A CH 183876A CH 183876D A CH183876D A CH 183876DA CH 183876 A CH183876 A CH 183876A
Authority
CH
Switzerland
Prior art keywords
azo dye
dye
preparation
pyrazolone
naphthol
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 CH183876A publication Critical patent/CH183876A/en

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Description

  

  Verfahren zur Herstellung eines     Azofarbstoffes.       Gegenstand des vorliegenden Zusatzpaten  tes ist ein Verfahren zur Herstellung eines       Azofarbstoffes,    welches dadurch gekenn  zeichnet ist, dass man dianotierte     1-Amino-2-          naphtol-4-sulfonsäure    mit     3-Phenyl-5-pyr-          azolon    kuppelt.

      <I>Beispiel:</I>  25 Gewichtsteile der festen     Diazoverbin-          dung    der     1-Amino-2-naphtol-4-sulfonsäure     werden mit 100 Gewichtsteilen Wasser an  gerührt und bei 20   in eine     ätzn@Ltronalka-          lische    Lösung von 16 Gewichtsteilen     3-Phe-          nyl-5-pyrazolon    eingerührt. Der vollkommen  in Lösung befindliche Farbstoff wird durch       Ansäuren    gefällt, filtriert und getrocknet.  



  Er stellt ein rotes Pulver dar, das Wolle  aus saurem Bade in roten Tönen von sehr    guter Wasch- und Lichtechtheit färbt. Durch  Nachbehandlung mit Chromsalzen kann die  Echtheit der Färbung noch verbessert wer  den.



  Process for the preparation of an azo dye. The subject of the present additional patent is a process for the production of an azo dye, which is characterized in that dianotated 1-amino-2-naphthol-4-sulfonic acid is coupled with 3-phenyl-5-pyrazolone.

      <I> Example: </I> 25 parts by weight of the solid diazo compound of 1-amino-2-naphthol-4-sulfonic acid are stirred with 100 parts by weight of water and at 20 in a caustic solution of 16 parts by weight of 3 -Phenyl-5-pyrazolone stirred in. The dye, which is completely in solution, is precipitated by acidification, filtered and dried.



  It is a red powder that dyes wool from an acid bath in red shades that are very washfast and lightfast. The fastness of the coloration can be further improved by post-treatment with chromium salts.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man dianotierte 1-Amino-2-naphtol-4-sulfonsäure mit 3-Phenyl-5-pyrazolon kuppelt. Der so erhaltene Farbstoff stellt ein. rotes Pulver dar, das Wolle aus saurem Bade in roten Tönen von sehr guter Wasch- und Lichtechtheit färbt. Durch Nachbehandlung mit Chromsalzen kann die Echtheit der Fär bung noch verbessert werden. PATENT CLAIM: Process for producing an azo dye, characterized in that dianotated 1-amino-2-naphthol-4-sulfonic acid is coupled with 3-phenyl-5-pyrazolone. The dye thus obtained adjusts. red powder that dyes wool from acid baths in red shades of very good wash and lightfastness. The fastness of the dye can be improved by post-treatment with chromium salts.
CH183876D 1933-12-01 1934-11-29 Process for the preparation of an azo dye. CH183876A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE183876X 1933-12-01
CH180961T 1934-11-29

Publications (1)

Publication Number Publication Date
CH183876A true CH183876A (en) 1936-04-30

Family

ID=25720492

Family Applications (1)

Application Number Title Priority Date Filing Date
CH183876D CH183876A (en) 1933-12-01 1934-11-29 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH183876A (en)

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