CH285355A - Process for the preparation of a whitening agent. - Google Patents

Process for the preparation of a whitening agent.

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Publication number
CH285355A
CH285355A CH285355DA CH285355A CH 285355 A CH285355 A CH 285355A CH 285355D A CH285355D A CH 285355DA CH 285355 A CH285355 A CH 285355A
Authority
CH
Switzerland
Prior art keywords
whitening agent
preparation
stilbene
ethoxy
amino
Prior art date
Application number
Other languages
German (de)
Inventor
Ag J R Geigy
Original Assignee
Ag J R Geigy
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 Ag J R Geigy filed Critical Ag J R Geigy
Publication of CH285355A publication Critical patent/CH285355A/en

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Description

  

  Verfahren zur Herstellung eines     Aufhellungsmittels.            Clegenstand    vorliegenden Patentes ist ein  Verfahren zur Herstellung eines     Aufhellungs-          mittels.    Das Verfahren ist dadurch gekenn  zeichnet, dass man     4,4'-Diamino-stilben-2,2'-di-          sulfonsäure    mit einem.     2-(ss-iVlethoxy-äthoxy)-          benzoylhalogenid    bis zum Verschwinden der       Aminogruppen        acyliert.     



  Das erhaltene neue     Aufhellungsmittel,    die       4,4'-Di-[        2"-(ss-methoxy-äthoxy)-benzoylamino]-          stilben-2,2'-disulfonsäure,    stellt. ein schwach  gelblich gefärbtes Pulver dar und besitzt gute  Affinität zur     Cellulosefaser.            Beispiel:

              37    Teile     4,4'-1)iainino-still)en-2,2'-disulfon-          säure    werden in 1000 Teilen Wasser unter  Zusatz von 10,6 Teilen     eale.    Soda gelöst und  bei 0 bis 10  mit einer Lösung von 42,9 Tei  len     2-(ss-hletlioxy-ätlioxy)-benzoylehlorid    in  <B>150</B> Teilen Benzol kräftig verrührt und durch       Zutropfen    einer 1     5 /oigen        Sodalösung    die     frei-          werdende    Salzsäure neutralisiert.

   Sobald kein       Sodaverbraucli    mehr stattfindet, gibt man so  viel Soda zu, bis schwach     phenolplithaleinalka-          liselie    Reaktion herrscht, erwärmt auf 80 bis    90  und lässt das Benzol am absteigenden Küh  ler     abdestillieren.    Die zurückbleibende, wäs  serige Lösung enthält das     Reaktionsprodukt,     als gelbliche, leicht     filtrierbare        ATasse.    Nach  dem Trocknen bildet das so erhaltene     Dina-          triumsalz    der     4,4'-Di-[2"-(,B-methoxy-äthoxy)-          benzoylamino]-stilben-2,

  2'-disulfonsäure    ein  gelbliches Pulver, dessen wässerige Lösung auf  farblosem     Cellulosematerial    im ultravioletten  Licht und im ultraviolette Strahlen enthalten  den Tageslicht blau fluoreszierende, farblose       Fä.rbung-en    erzeugt.



  Process for the preparation of a whitening agent. The present patent is a method of making a whitening agent. The process is characterized in that 4,4'-diamino-stilbene-2,2'-disulfonic acid with a. 2- (ss-iVlethoxy-ethoxy) - benzoyl halide acylated until the amino groups disappear.



  The new brightening agent obtained, 4,4'-di- [2 "- (ss-methoxy-ethoxy) -benzoylamino] - stilbene-2,2'-disulfonic acid, is a pale yellowish colored powder and has a good affinity for Cellulose fiber. Example:

              37 parts of 4,4'-1) iainino-still) en-2,2'-disulphonic acid are eale in 1000 parts of water with the addition of 10.6 parts. Soda dissolved and vigorously stirred at 0 to 10 with a solution of 42.9 parts 2- (ss-hletlioxy-ätlioxy) -benzoylehlorid in <B> 150 </B> parts of benzene and the dropwise addition of a 1 5% sodium carbonate solution Hydrochloric acid released is neutralized.

   As soon as there is no more soda consumption, enough soda is added until the reaction is weakly phenolplithalein alkaline, heated to 80 to 90 and the benzene is allowed to distill off on the descending cooler. The remaining aqueous solution contains the reaction product as a yellowish, easily filterable cup. After drying, the dinatrium salt obtained in this way forms the 4,4'-di- [2 "- (, B-methoxy-ethoxy) -benzoylamino] -stilbene-2,

  2'-disulfonic acid is a yellowish powder, the aqueous solution of which on colorless cellulose material in the ultraviolet light and in the ultraviolet rays contains daylight produces blue fluorescent, colorless tints.

 

Claims (1)

PATENTANSPRUCH: Verfahren zur I1erstellung eines Aufhel- lungsmittels, dadurch gekennzeichnet, dass man 4,4'-Diamino-stilben-2,2'-disulfonsäure mit einem 2-(ss-llethoxy-äthoxy)-benzoylhalo- ;enid bis zum Verschwinden der Amino-rup- peri aeyliert. Das erhaltene neue Aufhellungsmittel., die 4,4'-D i- [ 2"- (ss-methoxy-ät; PATENT CLAIM: A method for producing a brightening agent, characterized in that 4,4'-diamino-stilbene-2,2'-disulfonic acid is mixed with a 2- (s-llethoxy-ethoxy) -benzoylhalo; enide until the Amino-rupperi aeylated. The obtained new lightening agent., The 4,4'-D i- [2 "- (ss-methoxy-ät; lio xy) -benzoyl amino ] - stilbeü2,2'-disul.fonsäure, stellt ein schwach gelblich gefärbtes Pulver dar und besitzt geite Affinität zur Cellulosefaser. lio xy) -benzoyl amino] - stilbeü2,2'-disul.fonsäure, is a slightly yellowish colored powder and has a good affinity for cellulose fibers.
CH285355D 1949-05-27 1949-05-27 Process for the preparation of a whitening agent. CH285355A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH285355T 1949-05-27
CH282055T 1949-05-27

Publications (1)

Publication Number Publication Date
CH285355A true CH285355A (en) 1952-08-31

Family

ID=25732135

Family Applications (1)

Application Number Title Priority Date Filing Date
CH285355D CH285355A (en) 1949-05-27 1949-05-27 Process for the preparation of a whitening agent.

Country Status (1)

Country Link
CH (1) CH285355A (en)

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