CH103137A - Process for the preparation of a disazo dye. - Google Patents

Process for the preparation of a disazo dye.

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Publication number
CH103137A
CH103137A CH103137DA CH103137A CH 103137 A CH103137 A CH 103137A CH 103137D A CH103137D A CH 103137DA CH 103137 A CH103137 A CH 103137A
Authority
CH
Switzerland
Prior art keywords
preparation
pyrazolone
methyl
red
dye
Prior art date
Application number
Other languages
German (de)
Inventor
Farbenfabriken Vorm Friedr Co
Original Assignee
Farbenfab Vorm Bayer F & Co
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 Farbenfab Vorm Bayer F & Co filed Critical Farbenfab Vorm Bayer F & Co
Publication of CH103137A publication Critical patent/CH103137A/en

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  Verfahren zur Darstellung eines     Disazofarbstoffes.       Es wurde gefunden, dass man einen     gat     ziehenden und gut löslichen     substantiven     Farbstoff erhält, wenn man die     Tetrazover-          bindung    der     Benzidindikarbonsäure    einerseits  mit     1-m-Aminophenyl-3-methyl-5-pyrazolon,     anderseits mit     1-rr.-Nitrophenyl-3-methyl-5-          pyrazolon    kuppelt, dann die     Aminogruppe          diazotiert    und verkocht und zum     Schlusse     die Nitrogruppe mit Schwefelnatrium redu  ziert.  



  <I>Beispiel:</I>  272 Gewichtsteile     4.4'-Diaminophenyl-          3.3'-dicarbonsäure    werden in Wasser mit  Nitrit und Salzsäure     tetrazotiert,    mit essig  saurem Natrium abgestumpft und dazu eine  Lösung von     225,5    Gewichtsteilen     1-m-Amino-          phenyl-3-methyl-5-pyrazolonchlorhydrat    in  Wasser gegeben. Nach Beendigung der Bil  dung des Zwischenproduktes wird     sodaalka-          lisch    gemacht und eine alkalische Lösung  von 219 Gewichtsteilen     1-m-Nitrophenyl-3-          methyl-5-pyrazolon    unter Rühren zugefügt.

    Der so erhaltene Farbstoff     wird    in üblicher  Weise mit Nitrit und Salzsäure     diazotiert,     verkocht und zum Schluss mit Schwefel-         natrium    reduziert. Der resultierende Farb  stoff stellt ein rotbraunes Pulver dar, das un  geheizte Baumwolle gelbrot anfärbt. Beim  Nachkupfern entsteht ein waschechtes und  lichtechtes     Gelbbraun.  



  Process for the preparation of a disazo dye. It has been found that a well-soluble substantive dye is obtained if the tetrazo compound of the benzidinedicarboxylic acid is mixed with 1-m-aminophenyl-3-methyl-5-pyrazolone on the one hand and with 1-rr.-nitrophenyl-3 on the other -methyl-5-pyrazolone couples, then diazotized the amino group and boiled it off and finally reduced the nitro group with sodium sulphide.



  <I> Example: </I> 272 parts by weight of 4,4'-diaminophenyl-3,3'-dicarboxylic acid are tetrazotized in water with nitrite and hydrochloric acid, blunted with acetic acid sodium and a solution of 225.5 parts by weight of 1-m-aminophenyl -3-methyl-5-pyrazolone chlorohydrate added to water. After the formation of the intermediate product has ended, it is made alkaline with soda and an alkaline solution of 219 parts by weight of 1-m-nitrophenyl-3-methyl-5-pyrazolone is added with stirring.

    The dye thus obtained is diazotized in the usual way with nitrite and hydrochloric acid, boiled and finally reduced with sodium sulphide. The resulting dye is a red-brown powder that dyes unheated cotton yellow-red. A real and lightfast yellow-brown is produced during re-coppering.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Disazo- farbstoffes, dadurch gekennzeichnet, dass mau die Tetrazoverbindung der Benzidindikarbon- säure einerseits mit 1-m-Aminophenyl-3- m6thyl-5-pyrazolon, anderseits mit 1-m-Ni- trophenyl-3-methyl-5-pyrazolonkuppelt, dann die A,minogruppe diazotiert und verkocht und zum Schlusse die Nitrogruppe mit Schwefel natrium reduziert. PATENT CLAIM: Process for the preparation of a disazo dye, characterized in that the tetrazo compound of benzidinedicarboxylic acid is mixed with 1-m-aminophenyl-3-methyl-5-pyrazolone on the one hand and with 1-m-nitrophenyl-3-methyl on the other -5-pyrazolone coupled, then the A, mino group diazotized and boiled off and finally the nitro group reduced with sodium sulfur. Der resultierende Farbstoff stellt ein rot braunes Pulver dar, das ungeheizte Baum wolle gelbrot anfärbt. Beim Nachkupfern entsteht ein waschechtes und lichtechtes Gelbbraun. The resulting dye is a red-brown powder that turns unheated cotton yellow-red. A real and lightfast yellow-brown is produced during re-coppering.
CH103137D 1921-02-28 1922-02-13 Process for the preparation of a disazo dye. CH103137A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE100184X 1921-02-28
CH100184T 1922-02-13

Publications (1)

Publication Number Publication Date
CH103137A true CH103137A (en) 1924-01-16

Family

ID=25705720

Family Applications (2)

Application Number Title Priority Date Filing Date
CH102911D CH102911A (en) 1921-02-28 1922-02-13 Process for the preparation of a disazo dye.
CH103137D CH103137A (en) 1921-02-28 1922-02-13 Process for the preparation of a disazo dye.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CH102911D CH102911A (en) 1921-02-28 1922-02-13 Process for the preparation of a disazo dye.

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CH (2) CH102911A (en)

Also Published As

Publication number Publication date
CH102911A (en) 1924-01-02

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