CH122932A - Process for the preparation of a vat dye of the thioindigo series. - Google Patents

Process for the preparation of a vat dye of the thioindigo series.

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Publication number
CH122932A
CH122932A CH122932DA CH122932A CH 122932 A CH122932 A CH 122932A CH 122932D A CH122932D A CH 122932DA CH 122932 A CH122932 A CH 122932A
Authority
CH
Switzerland
Prior art keywords
dimethylthioindigo
dichloro
preparation
vat dye
thioindigo series
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 CH122932A publication Critical patent/CH122932A/en

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Description

  

  Verfahren zur     Herstellung    eines     Küpenfarbstoffes    der     Thioindigoreihe.       Es wurde gefunden, dass man einen neuen       Küpenfarbstoff    der     Thioindigoreihe    erhält,  wenn man den     6.6'-Dichlor-4.4'-dimethylthio-          indigo    der     Bromierung    mit Brom oder Brom  abspaltenden Mitteln unterwirft. Die     Bro-          mierung    kann nach den üblichen Verfahren  in Nitrobenzol bei höherer Temperatur oder  beispielsweise in     Chlorsulfonsäure    bei niede  ren Temperaturen durchgeführt werden.  



  Der so erhaltene     5.5'-Dibrom-6.6'-dichlor-          4.4'-dimethylthioindigo    bildet ein dunkelrotes  Pulver, welches sich in     Schwefelsäuremono-          hydrat    und     Chlorsulfonsäure    mit dunkelgrüner  Farbe löst und mit     Hydrosulfit    und Natron  lauge eine goldgelbe     güpe    bildet, aus der  Baumwolle in licht-, koch- und chlorechten  rotvioletten Tönen gefärbt wird, die etwas  blauer sind als die des nach dem Haupt  patent dargestellten Farbstoffes.

      <I>Beispiel:</I>  20 Gewichtsteile     6.6'-Dichlor-4.4'-Di-          methylthioindigo    werden in 300 Gewichts  teilen Nitrobenzol suspendiert und mit 18-20  Gewichtsteilen Brom versetzt. Nach kurzem  Rühren bei gewöhnlicher Temperatur wird    langsam auf 130-140   erhitzt. Bei dieser  Temperatur wird solange gehalten, bis die       Bromwasserstoffentwicklung    zu Ende ist. Man  erhitzt dann noch kurze Zeit zum     SiedAn     und lässt erkalten. Der ausgeschiedene Farb  stoff wird filtriert und durch Auskochen mit  Sprit vom Nitrobenzol befreit.



  Process for the preparation of a vat dye of the thioindigo series. It has been found that a new vat dye of the thioindigo series is obtained if the 6,6'-dichloro-4,4'-dimethylthioindigo is subjected to bromination with bromine or bromine-releasing agents. The brominating can be carried out by the customary processes in nitrobenzene at a higher temperature or, for example, in chlorosulfonic acid at lower temperatures.



  The 5.5'-dibromo-6.6'-dichloro-4.4'-dimethylthioindigo obtained in this way forms a dark red powder which dissolves in sulfuric acid monohydrate and chlorosulfonic acid with a dark green color and, with hydrosulfite and sodium hydroxide solution, forms a golden yellow güpe from the cotton in light -, cooking and chlorine-proof red-violet tones that are somewhat bluer than those of the dye represented according to the main patent.

      <I> Example: </I> 20 parts by weight of 6.6'-dichloro-4.4'-dimethylthioindigo are suspended in 300 parts by weight of nitrobenzene, and 18-20 parts by weight of bromine are added. After brief stirring at normal temperature, the mixture is slowly heated to 130-140. This temperature is maintained until the evolution of hydrogen bromide has ended. It is then heated to the boil for a short time and allowed to cool. The precipitated dye is filtered and freed from nitrobenzene by boiling with fuel.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Küpen- farbstoffes der Thioindigoreihe, dadurch ge kennzeichnet, dass man den 6.6'-Dichlor-4.4'- dimethylthioindigo bromiert. Der so erhaltene 5. PATENT CLAIM: Process for the production of a vat dye of the thioindigo series, characterized in that the 6.6'-dichloro-4.4'-dimethylthioindigo is brominated. The 5. 5'-Dibrom-6. 6'-dichlor-4. 4'-dimethylthioin- digo bildet ein dunkelrotes Pulver, das sich in Schwefelsäuremonohydrat und Chlorsulfon- säure mit dunkelgrüner Farbe löst und mit Hydrosulfit und Natronlauge eine goldgelbe Küpe bildet, aus welcher Baumwolle in licht-, koch- und chlorechten rotvioletten Tönen ange färbt wird, die etwas blauer sind als die des nach dem Hauptpatent dargestellten Farbstoffes. 5'-dibromo-6. 6'-dichloro-4. 4'-dimethylthioindigo forms a dark red powder that dissolves in sulfuric acid monohydrate and chlorosulphonic acid with a dark green color and, with hydrosulphite and sodium hydroxide solution, forms a golden yellow vat from which cotton is dyed in light, boiling and chlorine-proof red-violet tones, which are somewhat bluer than that of the dye shown in the main patent.
CH122932D 1925-06-27 1926-06-25 Process for the preparation of a vat dye of the thioindigo series. CH122932A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE122932X 1925-06-27
CH120808T 1926-06-25

Publications (1)

Publication Number Publication Date
CH122932A true CH122932A (en) 1927-10-17

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ID=25709580

Family Applications (1)

Application Number Title Priority Date Filing Date
CH122932D CH122932A (en) 1925-06-27 1926-06-25 Process for the preparation of a vat dye of the thioindigo series.

Country Status (1)

Country Link
CH (1) CH122932A (en)

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