CH302362A - Process for the preparation of a whitening agent. - Google Patents

Process for the preparation of a whitening agent.

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Publication number
CH302362A
CH302362A CH302362DA CH302362A CH 302362 A CH302362 A CH 302362A CH 302362D A CH302362D A CH 302362DA CH 302362 A CH302362 A CH 302362A
Authority
CH
Switzerland
Prior art keywords
whitening agent
preparation
stilbene
disulfonic acid
benzoylamino
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 CH302362A publication Critical patent/CH302362A/en

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Description

  

      Verfahren    zur Herstellung eines     Aufhellungsmittels.       Gegenstand vorliegenden Patentes ist ein  Verfahren zur Herstellung eines     Aufhellungs-          mittels.    Das Verfahren ist dadurch gekenn  zeichnet, dass man     4,4'-Di-(2"-oxy-4"-methyl-          benzoylamino)-stilben-2,2'-disulfonsäure        äthy-          liert.     



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

  </I>  68,2 Teile     4,4'-Di-        (2"-oxy-4"-methyl-          benzoylamino)-stilben-2,2'-disulfonsäure    wer  den in 1400 Teilen Wasser und 8 Teilen       Natriumhydroxyd    gelöst und bei 50-60   unter Rühren mit 30,8 Teilen     Diäthylsulfat          äthyliert.    Das Reaktionsprodukt scheidet sieh  aus der Lösung als gut     filtrierbare    Masse ab    und stellt nach dem Trocknen ein nur schwach  g<B>D'</B>     #          elbliches    Pulver dar.

   Das so erhaltene     Dina-          triumsalz    der     4,4'-Di-        (2"-äthoxy-4"-methyl-          benzoylamino)-stilben-2,2'-disulfonsäure    ist in  heissem Wasser ziemlich     gut    löslich; beim Er  kalten     einer    heiss     gesättigten,        wässrigen    Lösung  scheidet sich die neue Verbindung als galler  tige,     intensiv    blauviolett     fluoreszierende     Masse ab.



      Process for the preparation of a whitening agent. The subject of the present patent is a method for the production of a whitening agent. The process is characterized in that 4,4'-di- (2 "-oxy-4" -methylbenzoylamino) stilbene-2,2'-disulfonic acid is ethylated.



  The new lightening agent obtained, 4,4'-di- (2 "-ethoxy-4" -methyl-benzoylamino) stilbene-2,2'-disulfonic acid, is a pale yellowish colored powder and has a good affinity for cellulose fibers. <I> example:

  </I> 68.2 parts of 4,4'-di- (2 "-oxy-4" -methyl-benzoylamino) -stilbene-2,2'-disulfonic acid who dissolved in 1400 parts of water and 8 parts of sodium hydroxide and with 50-60 ethylated with stirring with 30.8 parts of diethyl sulfate. The reaction product separates out of the solution as an easily filterable mass and, after drying, is an only slightly yellow powder.

   The dinatrium salt of 4,4'-di- (2 "-ethoxy-4" -methylbenzoylamino) stilbene-2,2'-disulfonic acid obtained in this way is fairly soluble in hot water; When a hot, saturated, aqueous solution is cooled, the new compound is deposited as a gelatinous, intensely blue-violet fluorescent mass.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Aufhel- lungsmittels, dadurch gekennzeichnet, dass man 4,4'-Di-(2"-oxy-4"-methyl-benzoylamino)- stilben-2,2'-disulfonsäure äthyliert. Das erhaltene neue Aufhelhmgsinittel, die 4,4'- Di - (2"- äthoxy- 4"-methyl-benzoylamino) - stilben-2,2'-disulfonsäure, Claim: Process for the production of a brightening agent, characterized in that 4,4'-di- (2 "-oxy-4" -methyl-benzoylamino) stilbene-2,2'-disulfonic acid is ethylated. The new Aufhelhmgsinittel obtained, the 4,4'-di - (2 "- ethoxy- 4" -methyl-benzoylamino) - stilbene-2,2'-disulfonic acid, stellt ein schwach gelblich gefärbtes Pulver dar und besitzt gute Affinität zur Cellulosefaser. is a slightly yellowish colored powder and has a good affinity for cellulose fibers.
CH302362D 1949-05-27 1949-05-27 Process for the preparation of a whitening agent. CH302362A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH276692T 1949-05-27
CH302362T 1949-05-27

Publications (1)

Publication Number Publication Date
CH302362A true CH302362A (en) 1954-10-15

Family

ID=25731711

Family Applications (1)

Application Number Title Priority Date Filing Date
CH302362D CH302362A (en) 1949-05-27 1949-05-27 Process for the preparation of a whitening agent.

Country Status (1)

Country Link
CH (1) CH302362A (en)

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