CH268425A - Process for the production of a chromating dye. - Google Patents
Process for the production of a chromating dye.Info
- Publication number
- CH268425A CH268425A CH268425DA CH268425A CH 268425 A CH268425 A CH 268425A CH 268425D A CH268425D A CH 268425DA CH 268425 A CH268425 A CH 268425A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- chromating
- production
- benzoyl
- benzoylating
- Prior art date
Links
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
- C09B43/00—Preparation of azo dyes from other azo compounds
- C09B43/18—Preparation of azo dyes from other azo compounds by acylation of hydroxyl group or of mercapto group
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Coloring (AREA)
Description
<B>Zusatzpatent</B> zum Hauptpatent Nr. 266372. Verfahren zur Herstellung eines Chromierungsfarbstoffes. 17s wurde gefunden, dass man zu einem wertvollen Chromierungsfarbstoff gelangt, wenn man den Monoazofarbstoff der Formel
EMI0001.0005
in wässerig alkalischem Medium bis zum Ein tritt eines Benzoylrestes mit benzoylierenden Mitteln behandelt.
Der neue Farbstoff löst sich in heissem Wasser mit, roter und in konz. Schwefelsäure mit blauer Farbe und färbt Wolle nach dem Einbadehromierungsverfahren in blauen Tö nen.
Der beim vorliegenden Verfahren als Aus gangsstoff dienende Monoazofarbstoff der oben erwähnten Formel kann durch Vereini gen von diazotierter 1-Amino-2-oxynaphtha- lin-4-sulfonsäure mit 4-Methyl-l-oxynaphtha- lin in alkalischem Medium erhalten werden.
Als benzoylierende Mittel kommen zum Beispiel. Benzoylhalogenide, wie Benzoylbro- mid oder vorzugsweise Benzoylchlorid, in Be tracht. Die Behandlung mit den benzoylieren- den Mitteln erfolgt erfindungsgemäss in wäs serigem, alkalischem Medium. Dabei empfiehlt es sich, einen geringen Überschuss über die zur Einführung eines Benzoylrestes ins Farbstoff molekül theoretisch benötigte Menge zu ver- wenden. Die Benzoylierung kann zum Beispiel bei Zimmertemperatur, beispielsweise bei etwa 20 bis 300, durchgeführt werden.
Zur Ver hütung einer VerseUung empfiehlt es sich, die erhaltene Benzoylverbindung aus neutralem bis schwach saurem Medium aufzuarbeiten.
<I>Beispiel:</I> 43 Teile des Farbstoffes (Mononatrium- salz) aus diazotierter 1-Amino-2-oxynaphtha- lin-4-sulfonsäure und 4-Methyl-l-oxynaphtha- lin werden als feuchte Paste mit 100 Teilen Wasser, 20 Teilen kristallisiertem Natrium- a.cetat und 4,05 Teilen Natriumhydroxyd ver rührt und bei 20 bis 300 mit 16 Teilen Ben- zoylchlorid verestert.
Man rührt noch einige Stunden weiter, filtriert den braunen Farb- stoffester ab, wäscht ihn mit verdünnter Na- triumehloridlösung und trocknet ihn.
<B> Additional patent </B> to the main patent No. 266372. Process for the production of a chromating dye. It was found that a valuable chromating dye can be obtained by using the monoazo dye of the formula
EMI0001.0005
treated in an aqueous alkaline medium until a benzoyl residue occurs with benzoylating agents.
The new dye dissolves in hot water with, red and in conc. Sulfuric acid with a blue color and dyes wool in blue tones using the incorporation process.
The monoazo dye of the above formula used as starting material in the present process can be obtained by combining diazotized 1-amino-2-oxynaphthalene-4-sulfonic acid with 4-methyl-1-oxynaphthalene in an alkaline medium.
Benzoylating agents include, for example. Benzoyl halides, such as benzoyl bromide or preferably benzoyl chloride, are suitable. The treatment with the benzoylating agents is carried out according to the invention in an aqueous, alkaline medium. It is advisable to use a small excess over the amount theoretically required to introduce a benzoyl radical into the dye molecule. The benzoylation can for example be carried out at room temperature, for example at about 20-300.
To prevent contamination, it is advisable to work up the benzoyl compound obtained from a neutral to weakly acidic medium.
<I> Example: </I> 43 parts of the dye (monosodium salt) from diazotized 1-amino-2-oxynaphthalene-4-sulfonic acid and 4-methyl-1-oxynaphthalene are used as a moist paste with 100 parts Water, 20 parts of crystallized sodium acetate and 4.05 parts of sodium hydroxide are stirred and esterified at 20 to 300 parts with 16 parts of benzoyl chloride.
The mixture is stirred for a few more hours, the brown dye ester is filtered off, washed with dilute sodium chloride solution and dried.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH268425T | 1947-04-11 | ||
CH266372T | 1947-04-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH268425A true CH268425A (en) | 1950-05-15 |
Family
ID=25730874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH268425D CH268425A (en) | 1947-04-11 | 1947-04-11 | Process for the production of a chromating dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH268425A (en) |
-
1947
- 1947-04-11 CH CH268425D patent/CH268425A/en unknown
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