CH145323A - Process for the preparation of an azophthalein dye. - Google Patents

Process for the preparation of an azophthalein dye.

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Publication number
CH145323A
CH145323A CH145323DA CH145323A CH 145323 A CH145323 A CH 145323A CH 145323D A CH145323D A CH 145323DA CH 145323 A CH145323 A CH 145323A
Authority
CH
Switzerland
Prior art keywords
dye
preparation
azophthalein
acid
plated
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 CH145323A publication Critical patent/CH145323A/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:  
EMI0001.0005     
    welches gekennzeichnet ist dadurch, dass man  den     Monoazofarbstoff    aus     o-Amidophenol-p-          sulfosäure    und     Resorcin    mit     Diäthylamido-          m-oxybenzoylbenzoesäure    im Verhältnis glei  cher Moleküle kondensiert.

      <I>Beispiel:</I>  31 Teile des     Farbstoffes    aus     o-Amidophenol-          p-sulfosäure    und     Resorcin    werden mit 81,4  Teilen     Diäthylamido    - m -     oxybenzoylbenzoe-          säure    vermischt und eingetragen in 300 Teile       konzentrierte    Schwefelsäure. Man rührt 24    Stunden bei 80   und giesst in Wasser:     die          Farbstoffsäure    fällt vollständig aus. sie  bildet ein bronzierendes Pulver, das sich in  Wasser auf Zusatz von Alkalien violett, in       konzentrierter    Schwefelsäure gelbrot löst.

   Die       nachchromierten    oder     nachgekupferten    Fär  bungen auf Wolle und Seide des nach be  kannten Verfahren in das     Alkalisalz    über  geführten Farbstoffes sind blau und besitzen  gute Echtheitseigenschaften.



  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:
EMI0001.0005
    which is characterized in that the monoazo dye from o-amidophenol-p-sulfonic acid and resorcinol is condensed with diethylamido-m-oxybenzoylbenzoic acid in a ratio of the same molecules.

      <I> Example: </I> 31 parts of the dye from o-amidophenol-p-sulfonic acid and resorcinol are mixed with 81.4 parts of diethylamido-m-oxybenzoylbenzoic acid and added to 300 parts of concentrated sulfuric acid. The mixture is stirred for 24 hours at 80 and poured into water: the dye acid precipitates completely. it forms a bronzing powder which, when alkalis are added, dissolves violet in water and yellow-red in concentrated sulfuric acid.

   The re-chromed or re-coppered dyeings on wool and silk of the dye carried over into the alkali salt according to known processes are blue and have good fastness properties.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azo- phtaleinfarbstoffes, dadurch gekennzeichnet, dass man den Monoazofarbstoff aus o-Amiclo- phenol-p-sulfosäure und Resorein mit 1)i- äthylamido - m - oxybenzoylbenzoesäure kon densiert. Der Farbstoff ist ein dunkles Pul ver, das sich in Wasser violett, in konzen trierter Schwefelsäure gelbrot löst. Die nach- chromierte oder nachgekupferte Färbung ist blau. PATENT CLAIM: A process for the preparation of an azophthalein dye, characterized in that the monoazo dye from o-amiclophenol-p-sulfonic acid and resorein is condensed with 1) i-ethylamido-m-oxybenzoylbenzoic acid. The dye is a dark powder that dissolves violet in water and yellow-red in concentrated sulfuric acid. The chromium-plated or copper-plated color is blue.
CH145323D 1928-05-24 1929-05-21 Process for the preparation of an azophthalein dye. CH145323A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE145323X 1928-05-24
CH142447T 1929-05-21

Publications (1)

Publication Number Publication Date
CH145323A true CH145323A (en) 1931-02-15

Family

ID=25714072

Family Applications (1)

Application Number Title Priority Date Filing Date
CH145323D CH145323A (en) 1928-05-24 1929-05-21 Process for the preparation of an azophthalein dye.

Country Status (1)

Country Link
CH (1) CH145323A (en)

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