DE204772C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

..,. '■ - M 204772 CLASS 22 a. GROUP

The action of alkaline sulfur on haloanthraquinone derivatives is described in the patents 95484 and 102532. In the proceedings of the first-mentioned patent to obtain a sulfur black halogen-free and halogen-containing anthraquinone derivatives at higher temperatures with sulphurous alkalis or polysulphides without Addition of solvents to be fused; it's playing . obviously the halogen here not matter. In the process of patent 102532 a halogen-containing nitroanthraquinone derivative is used by reduction z. B. with alkaline sulfur in an aminoanthraquinone- ' transferred derivative, in which reaction the halogen is also not involved.

It has now been found that haloanthraquinones and their derivatives, when treated with solutions of alkali polysulphides, convert into new leuco compounds which can be fixed on unstained cotton and give valuable hues through subsequent oxidation. In contrast to that described in patent specification 95484, the reaction takes place at a low temperature. The new products obtained in this way contain sulfur and are in all probability mercaptans, so that the new reaction evidently consists in an exchange of halogens for the SH group.

Example ι.

ίο kg ■ finely divided a - chloranthraquinone are boiled for 4 hours with a solution of 50 kg of crystallized sodium sulfur and 6 kg of sulfur in 50 kg of alcohol and 50 liters of water. After cooling, the reaction product separates out in shiny bronze crystals and is isolated by suction. Its solution in water is red; Unstained cotton is dyed from this solution in dirty red tones that turn a beautiful green-yellow when oxidized.

If the α-chloroanthraquinone is replaced by ι - chloro - 4 - oxyanthraquinone, one obtains dark blue needles that dissolve in water with a green-blue color. The colorations of this product on cotton are salmon red.

Example 2.

10 kg of i-amino-2 · 4-dibromoanthraquinone will be with a solution of 50 kg of crystallized sodium sulfur and 6 kg of sulfur in Boiled 75 liters of water and 75 kg of alcohol until a blue solution has formed. The dye is salted out from this solution by chlorammonium, filtered off with suction and dried. It is a dark purple powder that is in a dilute solution of Sodium sulfur with blue, in alkaline

Dissolves hydrosulfite solution with an orange-yellow color. With these solutions you get on cotton beautiful red-violet colorations.

j. Example 3.

IO kg of finely ground bromanthrapyridone (see patent specification 192201, class 22 b) are with a solution of 60 kg of crystallized sulfur aetrium and 8 kg of sulfur in 60 l of water and 60 kg of alcohol boiled for 2 hours. The melt solidifies into a thick, bronze

. shimmering crystal pulp, from which the resulting product is isolated by suction. The solution of the dye in water is initially violet-red and turns on when standing the air blue. Cotton is stained orange-yellow by this solution.

The dye can also be colored from the hydrosulfite vat, which is yellow.

Claims (1)

Patent claim:, Process for the preparation of sulfur-containing dyes of the anthracene series, consisting in that one halanthraquinones or their derivatives with alkali polysulphides in the presence of a solution .bzw. Treated diluent.