CH185957A - Process for the preparation of a yellow substantive cotton dye. - Google Patents

Process for the preparation of a yellow substantive cotton dye.

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Publication number
CH185957A
CH185957A CH185957DA CH185957A CH 185957 A CH185957 A CH 185957A CH 185957D A CH185957D A CH 185957DA CH 185957 A CH185957 A CH 185957A
Authority
CH
Switzerland
Prior art keywords
yellow
preparation
dye
cotton dye
substantive cotton
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 CH185957A publication Critical patent/CH185957A/en

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Description

  

  Verfahren zur Darstellung eines gelben     substantiven    Baumwollfarbstoffes.    Nach der deutschen Patentschrift Nr. 65402  erhält man durch Einwirkung alkalischer  Oxydationsmittel auf     Dehydrothiotoluidirr-          sulfosäure    und ihre Homologen gelbe Sub  stantive Baumwollfarbstoffe.  



  Es wurde nun gefunden, dass man einen  wesentlich lichtechteren,     grünstichig    gelben  Farbstoff erhält, wenn man die in der deut  schen Patentschrift Nr. 277395 beschriebene       2-p-Aminophenyl-6-carboxy-benzthiazol-sulfo-          säure    dem obigen Verfahren unterwirft.  



  Der neue Farbstoff 'bildet ein oranges, in  Wasser leicht lösliches Pulver und färbt die  pflanzliche Faser in einem     grünstichigen,    sehr  lichtechten Gelb. In konzentrierter Schwefel  säure löst er sich mit     rotbratrrrer    Farbe.  



  <I>Beispiel:</I>       In    die Lösung von 35 Teilen     2-p-Amino-          phenyl-g-carboxy-benzthiazol-sulfosäure    in  8 bis 9 Teilen     Ätznatron    und 800 bis 1000  Teilen Wasser lässt man unter gutem Rühren    180 Teile einer     Natriumhypochloritlösung,     die 100 bis 120 Teile aktives Chlor im Liter  enthält, einfliessen, rührt vorteilhaft mehrere  Stunden bei Raumtemperatur nach und er  hitzt dann zur Vollendung der Farbstoff  bildung auf 70 bis 80  . Der Farbstoff wird  durch     Aussalzen    isoliert.



  Process for the preparation of a yellow substantive cotton dye. According to German Patent No. 65402, the action of alkaline oxidizing agents on dehydrothiotoluidirulfonic acid and its homologues gives yellow sub stantive cotton dyes.



  It has now been found that a significantly more lightfast, greenish yellow dye is obtained if the 2-p-aminophenyl-6-carboxy-benzothiazole-sulfonic acid described in German patent specification No. 277395 is subjected to the above process.



  The new dye forms an orange powder that is easily soluble in water and colors the vegetable fiber in a greenish, very lightfast yellow. In concentrated sulfuric acid it dissolves with a roast red color.



  <I> Example: </I> In the solution of 35 parts of 2-p-aminophenyl-g-carboxy-benzthiazole-sulfonic acid in 8 to 9 parts of caustic soda and 800 to 1000 parts of water, 180 parts of a water are allowed with thorough stirring Sodium hypochlorite solution, which contains 100 to 120 parts of active chlorine per liter, is poured in, advantageously stirred for several hours at room temperature and then heated to 70 to 80 to complete the dye formation. The dye is isolated by salting out.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines gelben Substantiven Baumwollfarbstoffes, dadurch gekennzeichnet, dass man 2-p-Amirrophenyl- 6-carboxy-benzthiazol-sulfosäure mit alka lischen Oxydationsmitteln behandelt. Der neue Farbstoff bildet ein oranges, in Wasser leicht lösliches Pulver und färbt die pflanzliche Faser in einem grünstichigen, sehr lichtechten Gelb. In konzentrierter Schwefel säure löst er sich mit rotbrauner Farbe. PATENT CLAIM: Process for the representation of a yellow noun cotton dye, characterized in that 2-p-amirrophenyl-6-carboxy-benzothiazole-sulfonic acid is treated with alkaline oxidizing agents. The new dye forms an orange powder that is easily soluble in water and colors the vegetable fiber in a greenish, very lightfast yellow. In concentrated sulfuric acid, it dissolves with a red-brown color.
CH185957D 1934-11-07 1935-10-04 Process for the preparation of a yellow substantive cotton dye. CH185957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE185957X 1934-11-07

Publications (1)

Publication Number Publication Date
CH185957A true CH185957A (en) 1936-08-31

Family

ID=5719677

Family Applications (1)

Application Number Title Priority Date Filing Date
CH185957D CH185957A (en) 1934-11-07 1935-10-04 Process for the preparation of a yellow substantive cotton dye.

Country Status (1)

Country Link
CH (1) CH185957A (en)

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