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CH145320A - Process for the preparation of an azophthalein dye. - Google Patents

Process for the preparation of an azophthalein dye.

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Publication number
CH145320A
CH145320A CH145320DA CH145320A CH 145320 A CH145320 A CH 145320A CH 145320D A CH145320D A CH 145320DA CH 145320 A CH145320 A CH 145320A
Authority
CH
Switzerland
Prior art keywords
dye
preparation
azophthalein
acid
green
Prior art date
Application number
Other languages
German (de)
Inventor
A-G J R Geigy
Original Assignee
Geigy Ag J R
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 Geigy Ag J R filed Critical Geigy Ag J R
Publication of CH145320A publication Critical patent/CH145320A/en

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Description

  

  Verfahren zur Darstellung eines     Azophtaleinfarbstoffes.       Gegenstand dieser Erfindung ist -ein Ver  fahren zur Darstellung eines     Azophtalein-          farbstoffes    von nachstehender Formel:  
EMI0001.0004     
    welches dadurch gekennzeichnet ist, dass man  den     Monoazofarbstoff    auf der     nitrierten        1,2,4-          Diazonaphtolsulfosäüre    und     Resorcin    mit       Dimethylamido-m-oxybenzoylbenzoesäure    im  Verhältnis gleicher Moleküle kondensiert.  



  <I>Beispiel:</I>  36 Teile des Farbstoffes aus der nitrier  ten     1,2,4-Diazonaphtolsulfosäure    und     Resor-          cin    werden mit 28,5 Teilen     Dimethylamido-          m-oxybenzoylbenzoesäure    vermischt und ein  getragen in 300 Teile     konz.    Schwefelsäure.  Man     rührt    acht     Stunden    bei<B>60'</B> und giesst    darauf in Wasser; die     Farbstoffsäure    fällt  vollständig aus.

   Sie bildet getrocknet     eia          bronzierendes    Pulver, das in Wasser auf Zu  satz von Alkali blaugrün, in     konz.    Schwefel  säure violett löslich ist. Die     nachchromierteii     oder     nachgekupferten    Färbungen auf Wolle  und Seide des nach bekannten Verfahren in  das     Alkalisalz    übergeführten Farbstoffe  sind grün und besitzen gute Echtheitseigen  schaften.



  Process for the preparation of an azophthalein dye. The subject of this invention is a process for the preparation of an azophtalein dye of the following formula:
EMI0001.0004
    which is characterized in that the monoazo dye is condensed on the nitrated 1,2,4-diazonaphthol sulfonic acid and resorcinol with dimethylamido-m-oxybenzoylbenzoic acid in proportions of the same molecules.



  <I> Example: </I> 36 parts of the dye from the nitrated 1,2,4-diazonaphtholsulfonic acid and resorcin are mixed with 28.5 parts of dimethylamido-m-oxybenzoylbenzoic acid and added to 300 parts of conc. Sulfuric acid. The mixture is stirred for eight hours at <B> 60 '</B> and then poured into water; the dye acid precipitates out completely.

   When dried, it forms a bronzing powder, which in water with the addition of alkali is blue-green, in conc. Sulfuric acid is soluble in violet. The afterchromized or coppered dyeings on wool and silk of the dyes converted into the alkali salt by known processes are green and have good fastness properties.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azo- phtaleinfarbstoffes, dadurch gekennzeichnet. dass man den Monoazofarbstoff aus der nitrierten 1,2,4-Diazonaphtolsulfosäure und Resorcin mit Dimethylamido-m-oxybenzoyl- benzoesäure kondensiert. Der Farbstoff ist ein dunkles Pulver, das sich in Wasser blau grün, in konz. Schwefelsäure violett löst. Die nachchromierte oder nachgekupferte Fär bung ist grün. PATENT CLAIM: Process for the preparation of an azo phthalein dye, characterized. that one condenses the monoazo dye from the nitrated 1,2,4-diazonaphthol sulfonic acid and resorcinol with dimethylamido-m-oxybenzoylbenzoic acid. The dye is a dark powder that turns blue green in water, and in conc. Sulfuric acid dissolves violet. The re-chromed or re-coppered color is green.
CH145320D 1928-05-24 1929-05-21 Process for the preparation of an azophthalein dye. CH145320A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE145320X 1928-05-24
CH142447T 1929-05-21

Publications (1)

Publication Number Publication Date
CH145320A true CH145320A (en) 1931-02-15

Family

ID=25714069

Family Applications (1)

Application Number Title Priority Date Filing Date
CH145320D CH145320A (en) 1928-05-24 1929-05-21 Process for the preparation of an azophthalein dye.

Country Status (1)

Country Link
CH (1) CH145320A (en)

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