CH139081A - Process for the preparation of a blue dye of the diaminotriphenylmethane series. - Google Patents

Process for the preparation of a blue dye of the diaminotriphenylmethane series.

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Publication number
CH139081A
CH139081A CH139081DA CH139081A CH 139081 A CH139081 A CH 139081A CH 139081D A CH139081D A CH 139081DA CH 139081 A CH139081 A CH 139081A
Authority
CH
Switzerland
Prior art keywords
diaminotriphenylmethane
series
preparation
blue dye
dye
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 CH139081A publication Critical patent/CH139081A/en

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Description

  

  Verfahren zur Darstellung eines blauen     Farbstoffes    der     Diaminotriphenylmethanreihe.       Im Hauptpatent wird ein blauer     Farbstoff     beschrieben, der durch     Kondensation    von  1     1M1.        Benzaldehyd-2.4-disulfosäure    mit  2     111:o1.    2 .     1'-Methylpropylamino-l-methylben-          zol    und Oxydation der entstandenen     Leuko-          verbindung    erhalten wird.  



  Einen analogen     Farbstoff    mit den glei  chen wertvollen Eigenschaften erhält man,  wenn man 1     Mol.        Benzaldehyd-2.5-disulfo-          säure    mit 2     Mol.        2-Isopropylamino-l-methyl-          benzol    kondensiert und die     Leukoverbindung          dann    oxydiert.  



       Beispiel:     26,6 Teile     Benzaldehyd-2        .5-disulfosäure     werden in üblicher Weise in verdünnter  Schwefelsäure mit 34 Teilen     2-Isopropyl-          amino-l-methylbenzol    kondensiert. Die aus-    fallende     Leukoverbindung    wird in bekannter  Weise mit     Biehromat    bei Gegenwart von       Oxalsäure    und Schwefelsäure zum     Farbstoff     oxydiert, der     ausgesalzen    wird.



  Process for the preparation of a blue dye of the diaminotriphenylmethane series. The main patent describes a blue dye which is produced by condensation of 1 1M1. Benzaldehyde-2,4-disulfonic acid with 2 111: o1. 2. 1'-methylpropylamino-l-methylbenzene and oxidation of the leuco compound formed is obtained.



  An analogous dye with the same valuable properties is obtained if 1 mole of benzaldehyde-2,5-disulfonic acid is condensed with 2 moles of 2-isopropylamino-1-methylbenzene and the leuco compound is then oxidized.



       Example: 26.6 parts of benzaldehyde-2,5-disulfonic acid are condensed in the customary manner in dilute sulfuric acid with 34 parts of 2-isopropylamino-1-methylbenzene. The leuco compound which precipitates is oxidized in a known manner with Biehromat in the presence of oxalic acid and sulfuric acid to form the dye, which is then salted out.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines blauen Farbstoffes der Diaminotriphenylmethanreihe, dadurch gekennzeichnet, dass man 1 Mol. Benzaldehyd-2.5-disulfosäure mit 2 Mol. 2-Isopropylamino-l-methylbenzol kondensiert und die Leukoverbindung oxydiert. Der Farb stoff färbt Wolle und Seide in sehr kräftigen und auch bei künstlichem Licht klaren, schönen blauen Tönen an. Claim: Process for the preparation of a blue dye of the diaminotriphenylmethane series, characterized in that 1 mole of benzaldehyde-2,5-disulfonic acid is condensed with 2 moles of 2-isopropylamino-1-methylbenzene and the leuco compound is oxidized. The dye stains wool and silk in very strong and beautiful blue tones, even in artificial light.
CH139081D 1927-04-23 1928-04-21 Process for the preparation of a blue dye of the diaminotriphenylmethane series. CH139081A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE139081X 1927-04-23
CH136390T 1931-08-28

Publications (1)

Publication Number Publication Date
CH139081A true CH139081A (en) 1930-03-31

Family

ID=25712716

Family Applications (1)

Application Number Title Priority Date Filing Date
CH139081D CH139081A (en) 1927-04-23 1928-04-21 Process for the preparation of a blue dye of the diaminotriphenylmethane series.

Country Status (1)

Country Link
CH (1) CH139081A (en)

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