DE108274C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 22: dyes, varnishes, lacquers.

the anthracene series.

Patented in the German Empire on December 10, 1898.

It has been observed that those mentioned in patent 106227, by action of primary aromatic amines on dinitroanthraquinones and there as Dialphylido- (dialphyldiamido-) anthraquinones designated body, which for themselves no Show affinity to fibers by sulphurizing agents into valuable water-soluble dyes which are vividly burgundy colored on the animal fiber can be transferred and deliver red-violet to yellow-red nuances of outstanding lightfastness. at shorter resp. moderate action of sulfuric acid produces violet-red coloring Products that are relatively easy to salt out. If, on the other hand, you let the sulfuric acid more vigorously act on the dialphyldiamidoanthraquinones by z. B. anhydride-containing Sulfuric acid (about oleum with an anhydride content of 20 pCt) is used, then sulfonic acids are obtained, which are not or far more difficultly salted out by table salt or by potassium chloride than the first mentioned. These Acids can e.g. B. be isolated by converting them into the calcium salts and then these reacts with sodium carbonate, whereby the sodium salts of the sulfonic acids are obtained.

These latter sulfonic acids color wool in an acidic bath with a yellowish red tinge.

The following examples may serve to explain the procedure:

Example I.

100 kg · ι 5-Dianilidoanthrachinon are heated with 1,000 kg of sulfuric acid of 66 ⁰ B. so long "to about 80 to 100 ⁰ C., until a sample in hot water readily dissolves. The cooled melt is then poured into water, with a little table salt the dye is separated, filtered off, pressed and dried. It forms a chocolate-brown powder which is easily soluble in hot water with a red color; the addition of sodium carbonate or sodium hydrate to the aqueous solution does not change its color. The dye is present in alcohol and warm aniline Soluble cherry-red color, concentrated sulfuric acid dissolves it in a dirty brown color, and dyes wool in violet-red tones.

Example II.

10 kg of the i · 5-dianilidoanthraquinone are dissolved in 100 kg of oleum of 20 pCt. Entered anhydride content and ^{stirred at 30 to 35 0} C. until a sample has become completely soluble in water. The melt is then poured into ice water, the solution is precisely neutralized with milk of lime, and the gypsum which has separated out is filtered off. The filtrate is reacted with sodium carbonate, the precipitated carbonate of lime is filtered off, and the sodium salt of sulfonic acid contained in the filtrate is obtained in dry form by evaporation. It forms a dark-colored powder, easily soluble in water with a yellowish-red color, which becomes more bluish with the addition of sodium hydroxide solution. The dye dissolves red in concentrated sulfuric acid, but is as good as insoluble in alcohol and aniline. He dyes wool in an acid bath in very genuine red tones.

The condensation products can be found in a completely analogous manner according to the examples given above of ι · 5 - Di - ο - nitroanthraquinone with other aromatic amines in transfer water-soluble dyes; the procedure always remains the same in principle and the products available are very similar in their properties.

Of course, instead of pure ι · 5-dinitroanthraquinone and amines Condensationsproducte shown also those come to use, which from crude nitro product obtained by nitriding of anthraquinone.

Claims (1)

Claim: Process for the preparation of water-soluble, yellowish-red to red-violet dyes of the anthracene series, characterized in that the di-alphyl-diamidoanthraquinones treated with sulphurizing agents.