CH300773A - A process for preparing a disazo dye. - Google Patents

A process for preparing a disazo dye.

Info

Publication number
CH300773A
CH300773A CH300773DA CH300773A CH 300773 A CH300773 A CH 300773A CH 300773D A CH300773D A CH 300773DA CH 300773 A CH300773 A CH 300773A
Authority
CH
Switzerland
Prior art keywords
dye
preparing
red color
disazo dye
molecule
Prior art date
Application number
Other languages
French (fr)
Inventor
Sandoz S A
Original Assignee
Sandoz Sa
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 Sandoz Sa filed Critical Sandoz Sa
Publication of CH300773A publication Critical patent/CH300773A/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B31/00—Disazo and polyazo dyes of the type A->B->C, A->B->C->D, or the like, prepared by diazotising and coupling
    • C09B31/02—Disazo dyes
    • C09B31/12—Disazo dyes from other coupling components "C"
    • C09B31/14—Heterocyclic components

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Description

  

  Procédé de préparation     d'un    colorant     disazoïque.       Le présent brevet a pour objet un pro  cé<B>d</B>é de préparation d'un colorant     disazoïque.     Ce procédé est caractérisé en ce que l'on     di-          azote    une molécule d'acide     4'-(4"-aminobeii-          zoylamino)-1,1'-azobenzène-4,3'-disulfonique,     puis on copule le     diazoïque    ainsi obtenu avec  une molécule d'acide     2-phénylamino-5-hy-          droxynaphtalène-7-sulfonique.     



       Exemple:     On dissout 47,6     parties    d'acide     4'-(4"-          #im1nobenzoy'Iamnino)        -1,1'-a,zobenzène-4,3'-;di-          sulfonique    dans 250 parties d'eau à l'aide  d'hydroxyde de sodium,

   on ajoute 7 parties  de nitrite de sodium et on introduit lente  ment la solution     dans    un mélange de 45     par-          ties        d'acide        chlorhydrique    à     30        %        et        100        par-          ties    de glace, de faon que la température se  maintienne finalement     @à    5-10 .

   Une fois la       diazotation    terminée, on fait couler lentement,  en     l'espace    de 30     minutes,    la     suspension    du       diazoïque    dans une solution neutre de 31,5  parties d'acide 2 -     phénylamino    - 5 -     hydroxy-          naphtalène-7-sulfonique,    en ajoutant simulta  nément du bicarbonate de sodium, de façon à  maintenir le<B>pH</B> de la solution entre 6,5 et 7,0.

      Quand la copulation est achevée, on chauffe  la solution à 70 , on précipite le     colorant        di-          sazoïque        formé    par le     chlorure    de sodium, on  le filtre et on le sèche.  



  Le nouveau colorant est une poudre brun  rouge, qui se     dissout    dans l'eau avec une co  loration rouge et dans l'acide sulfurique con  centré avec     une    coloration rouge bordeaux. Il  teint le coton et la cellulose régénérée en des  nuances rouge brun bien     rongeables    et. solides  à la. lumière.



  A process for preparing a disazo dye. The present patent relates to a process <B> d </B> for the preparation of a disazo dye. This process is characterized in that a 4 '- (4 "-aminobeii- zoylamino) -1,1'-azobenzene-4,3'-disulfonic acid molecule is di-nitrogenized, then the diazo is copulated as follows. obtained with a molecule of 2-phenylamino-5-hydroxynaphthalene-7-sulfonic acid.



       Example: 47.6 parts of 4 '- (4 "- # im1nobenzoy'Iamnino) -1,1'-a, zobenzene-4,3' -; disulfonic acid are dissolved in 250 parts of water at 1 'using sodium hydroxide,

   7 parts of sodium nitrite are added and the solution is slowly introduced into a mixture of 45 parts of 30% hydrochloric acid and 100 parts of ice, so that the temperature is finally maintained at 5- 10.

   Once the diazotization is complete, the diazo suspension is slowly poured over 30 minutes into a neutral solution of 31.5 parts of 2-phenylamino-5-hydroxy-naphthalene-7-sulfonic acid, simultaneously adding sodium bicarbonate, so as to maintain the <B> pH </B> of the solution between 6.5 and 7.0.

      When coupling is complete, the solution is heated to 70, the diszoic dye formed by sodium chloride is precipitated, filtered and dried.



  The new colorant is a reddish brown powder, which dissolves in water with a red color and in concentrated sulfuric acid with a burgundy red color. It dyes cotton and regenerated cellulose in well-eatable and brownish red shades. solid at the. light.

Claims (1)

REVENDICATION: Procédé de préparation -d'un colorant di- sazoïque, caractérisé en ce que l'on diazote une molécule d'acide 4'-(4"-aminobenzoyl- amino)-1,1'-azobenzène-4,3'-disülfonique, puis on copule le diazoïque ainsi obtenu avec une molécule d'acide 2-phénylamino-5-hydroxy- naphtalène-7-siilfoniqite. Le nouveau colorant est -me poudre brun rouge, CLAIM: Process for the preparation of a diszoic dye, characterized in that a 4 '- (4 "-aminobenzoyl-amino) -1,1'-azobenzene-4,3' acid molecule is dinitrogenated. -disülfonique, then the diazo thus obtained is copulated with a molecule of 2-phenylamino-5-hydroxy-naphthalene-7-siilfoniqite. The new dye is a reddish brown powder, qui se dissout dans l'eau avec une co loration rouge et dans l'acide sulfurique con centré avec une coloration rouge bordeaux. Il teint le coton et la cellulose régénérée en des nuances rouge brun bien rongeables et solides à la liunière. which dissolves in water with a red color and in concentrated sulfuric acid with a burgundy red color. It dyes cotton and regenerated cellulose in shades of brownish red that are easy to eat and solid at the same time.
CH300773D 1951-04-27 1951-04-27 A process for preparing a disazo dye. CH300773A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH290300T 1951-04-27
CH300773T 1951-04-27

Publications (1)

Publication Number Publication Date
CH300773A true CH300773A (en) 1954-08-15

Family

ID=25732977

Family Applications (1)

Application Number Title Priority Date Filing Date
CH300773D CH300773A (en) 1951-04-27 1951-04-27 A process for preparing a disazo dye.

Country Status (1)

Country Link
CH (1) CH300773A (en)

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