CH121017A - Process for the preparation of a developer dye. - Google Patents

Process for the preparation of a developer dye.

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Publication number
CH121017A
CH121017A CH121017DA CH121017A CH 121017 A CH121017 A CH 121017A CH 121017D A CH121017D A CH 121017DA CH 121017 A CH121017 A CH 121017A
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CH
Switzerland
Prior art keywords
brown
dye
red
preparation
nitro
Prior art date
Application number
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German (de)
Inventor
Sandoz Chemische Fabri Vormals
Original Assignee
Chem Fab Vormals Sandoz
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 Chem Fab Vormals Sandoz filed Critical Chem Fab Vormals Sandoz
Publication of CH121017A publication Critical patent/CH121017A/en

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  Verfahren zur Darstellung eines     Entwicklerfarbstoffes.       Es wurde gefunden, dass ein wertvoller       Entwicklerfarbstoff    erhalten wird, wenn man       tetrazotiertes        o-Tolidin    in molekularem Ver  hältnis mit     2'-Methyl-3'-nitro-5'-sulfo-1-phenyl-          5-pyrazolon-3-karbonsäure    zu einem Zwischen  produkt vereinigt, dasselbe mit     a-Naphtyl-          aminsulfosäure-1,

  6-Cleve        weiterkuppelt    und in  dem so gebildeten     Disazofarbstoff    die     Nitro-          gruppe    mit Schwefelnatron zur     Aminogruppe     reduziert.    Der neue     Farbstoff    bildet ein braun  schwarzes Pulver, das sich in Wasser mit  rotbrauner, in konzentrierter Schwefelsäure  mit blauvioletter Farbe löst. Er färbt     unge-          beizte    Baumwolle in. rotbraunen Tönen,  welche sich durch     Diazotieren    auf der Faser  und nachfolgende Entwicklung mit     Betanaph-          tol    zu waschechtem Schokoladebraun fixieren  lassen.

      <I>Beispiel:</I>  Zu der     Terazoditolyllösung    aus 21,2 Teilen       o-Tolidin    lässt man bei 0-5   C die Lösung  des     Trinatriumsalzes    von 34,3 Teilen     2'-Methyl-          3'-        nitro        -5'-    s     ulfo        -1-ph        enyl    - 5 -pyrazolon-3-kar-    Bonsäure zufliessen. Nach vollständiger Bil  dung des     Zwischenproduktes    gibt man die  Lösung von 24,5 Teilen     a-Naphtylaminsulfo-          saurem        Natron-1,6-Cleve    zu.

   Die Kombination  ist nach wenigen Stunden beendigt. Man  neutralisiert durch Zugabe von 18 Teilen       kalzinierter    Soda, gibt die Lösung von 60  Teilen kristallisiertem Schwefelnatron zu und  hält die braunrote Lösung solange bei 50   C,  bis sich kein unverändertes     Schwefelnatron     mehr nachweisen lässt, was 12-15 Stunden  dauert. Alsdann wird mit Salzsäure neutrali  siert und der     Farbstoff    ausgewaschen.



  Process for the preparation of a developer dye. It has been found that a valuable developer dye is obtained if tetrazotized o-tolidine in a molecular ratio with 2'-methyl-3'-nitro-5'-sulfo-1-phenyl-5-pyrazolone-3-carboxylic acid to one Combined between product, the same with a-naphthyl aminesulfonic acid-1,

  6-Cleve further coupled and in the disazo dye thus formed, the nitro group is reduced to the amino group with sodium sulphide. The new dye forms a brown-black powder that dissolves in water with a red-brown color, and in concentrated sulfuric acid with a blue-violet color. It dyes unplaced cotton in red-brown shades, which can be fixed to washable chocolate brown by diazotizing the fiber and then developing it with betanaphthol.

      <I> Example: </I> The solution of the trisodium salt of 34.3 parts of 2'-methyl-3'-nitro -5'- s is added to the terazoditolyl solution of 21.2 parts of o-tolidine at 0-5 ° C ulfo -1-ph enyl - 5 -pyrazolon-3-carboxylic acid. When the intermediate product is completely formed, the solution of 24.5 parts of α-naphthylaminesulfonic acid sodium 1,6-Cleve is added.

   The combination ends after a few hours. The mixture is neutralized by adding 18 parts of calcined soda, the solution of 60 parts of crystallized sodium sulfate is added and the brown-red solution is kept at 50 ° C. until unchanged sodium sulfate can no longer be detected, which takes 12-15 hours. It is then neutralized with hydrochloric acid and the dye is washed out.

 

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Entwick- lerfarbstoffes, dadurch gekennzeichnet, dass man tetrazotiertes o-Tolidin in molekularem Verhältnis mit 2'-Methyl-3'-nitro-5'-sulfo-l- phenyl-5-pyrazolon-3-karbonsäure zu einem Zwischenprodukt vereinigt, dasselbe mit a Naphtylaminsulfosäure-1,6-Cleve weiterkup- pelt und in dem so gebildeten Disazofarbstoff die Nitrogruppe mit Schwefelnatron zur Amino- gruppe reduziert. Claim: method for the preparation of a developer dye, characterized in that tetrazotized o-tolidine is added in a molecular ratio with 2'-methyl-3'-nitro-5'-sulfo-1-phenyl-5-pyrazolone-3-carboxylic acid combined with an intermediate product, coupled it further with a naphthylaminesulfonic acid-1,6-Cleve, and in the disazo dye thus formed, the nitro group is reduced to the amino group with sodium sulphide. Der neue Farbstoff bildet ein braunschwarzes Pulver, das sich in Wasser mit rotbrauner, in konzentrierter Schwefelsäure mit violetter Farbe löst. Er färbt ungebeizte Baumwolle in rotbraunen '.Tönen, welche durch Diazotieren auf der Faser und nachfolgende Entwicklung mit Betanaph- tol zu waschechtem Schokoladebraun fixiert werden. The new dye forms a brown-black powder that dissolves in water with a red-brown color, and in concentrated sulfuric acid with a purple color. It dyes unstained cotton in red-brown tones, which are fixed to washable chocolate brown by diazotizing on the fiber and subsequent development with betanaphthol.
CH121017D 1925-03-28 1925-11-02 Process for the preparation of a developer dye. CH121017A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE121017X 1925-03-28
CH119229T 1925-10-17

Publications (1)

Publication Number Publication Date
CH121017A true CH121017A (en) 1927-07-01

Family

ID=25709201

Family Applications (1)

Application Number Title Priority Date Filing Date
CH121017D CH121017A (en) 1925-03-28 1925-11-02 Process for the preparation of a developer dye.

Country Status (1)

Country Link
CH (1) CH121017A (en)

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