DE97210C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

Through the process the representation of azo dyes is achieved, which the vegetable Dye fibers, without prior pickling, in dark, rich colors that are resistant to acids and Resistant to alkalis. This method is an extension of that described in Patent No. 56456 protected.

The dyes obtained by the present process stand out above those of patent no. 56456 by the following properties:

i. By making it easier to use. The after Namely, the dyes obtained in Patent No. 56456 require the presence of caustic soda and of considerable quantities of table salt, without, however, having drawn out the dye bath would. The dyes obtained by the present process, on the other hand, dye in aqueous media Solution containing small amounts of common salt solutions, such as table salt or carbonate Baking soda, can be added. With ι or 3 pCt. the dye bath completely exploited.

2. By the great diversity of the Nuances. According to Patent No. 56456, red to bluish-red dyes are obtained, while the present process gives dark blue-green tones.

The starting material used are those dyes that dye wool, which according to the Patents No. 65651 and 75015 arise when p- and m-Nitranilih with amidonaphtholdisulfonic acid H can be paired in acidic solution and then combined further in an alkaline way with the im Addressed diazo compounds.

In addition to these dyes, there are those which are obtained from p-nitro-o-toluidine and m-nitro-p-toluidine, and which are not described in the above-mentioned patents.

These dyes are easily and quantitatively converted into azoxyamine dyes Reduction in an alkaline solution by means of glucose, tin oxide or arsenic Acid, d. H. by reducing agents, which are also used in the process of patent no. 56456 have found.

The presentation can be done in two ways:

I. The diazo compound of nitramine is first prepared by the procedures of Patent Nos. 65651 and 75015 in acidic solution with amidonaphthol disulfonic acid H paired, then further connected with another diazo compound in alkaline solution and finally in azoxyamine compound convicted, or

II. The diazo compound of nitramine is paired with amidonaphthol disulfonic acid H, the Dye converted into azoxyamine dye and this further with a diazo compound coupled. The dyes obtained by both routes are identical.

Example I.

One solves the BEZW after the method of the patents No. 75015. 65651 from 13.8 kg p-nitroaniline

and diazobenzene dye obtained in 1500I water, the solution gives 150 1 sodium hydroxide solution of 40 ° for example, and 11 kg of dextrose are added and heated for 4 to 5 hours at 40 to 50 ⁰ C. The dye formed is salted out, priced and dried; it is a black, bronze-shining powder, the aqueous solution of which turns unstained cotton a dark green color.

Example II.

14.2 kg of p-nitro-o-toluidine (melting point 127 ⁰ ) are paired with amidonaphthol disulfonic acid H in acidic solution and, as indicated in patent specification No. 91507, converted into azoxyamine dye with grape sugar.

This dye is very sensitive to acids and has no technical merit. This The disadvantage disappears, however, by the subsequent pairing with a second diazo body. For this purpose, the paste obtained from the amounts by weight given above is dissolved in 1,500 liters of water and made alkaline held solution the diazo compound of 9.3 kg of aniline or 10.7 kg of p-toluidine flow in.

The dye obtained, which is obtained by salting out, pressing and drying, is a dark, shiny bronze powder that dissolves easily in water and is unpickled Dyes cotton with a dark blue-green color.

The table below shows the most important of the dyes obtainable in the above manner.

Amidonaphthol disulfonic acid H combined in acidic solution

with the diazo compounds of

p- m-

O
t ^ ¹ \ zo CD 3 ^ ι σ CD cn Y PS
N η η O B. ti G" 3 O CD O SJ

in an alkaline solution
combined with

, Aniline

ρ-toluidine

ο -Toluidine

α-naphthylamine

m-sulfanilic acid;

p-sulfanilic acid '.

p-toluidine sulfonic acid (1, 2,4)

ο-toluidine sulfonic acid (1, 2, 5)

Claims (1)

Patent claim: A process for the preparation of substantive dyes which cotton stain dark blue and blue green, consisting, that Nitroazofarbstoffe according to the method of the patent no. Are reduced 56456 in an alkaline solution to Azoxyazofarbstoffen, wherein one selected from the diazo compounds of p-nitroaniline (mp. 147 ⁰ C), m-nitroaniline (mp. iio °), p-nitro-o-toluidine (mp. 127 ⁰⁾ or m-Nitrop-toluidine (mp. ° yy) dyes available in acid solution with Amidonaphtoldisulfosäure H a) ', either converted into azoxyamine dyes and from these further according to the patents No. 65651 and 75015 in alkaline solution nitroaniline
M.p. 147 ^c Nitro o-toluidine 127 ° Nitroaniline
M.p. no ⁰ Nitro p-toluidine M.p. 77 ° green Blue. teal teal blue blue blue green blue i. those from p-nitroaniline with the diazo compounds of aniline, o- or p-toluidine, a-naphthylamine or m-sulfanilic acid; 2. those from m-nitroaniline with the diazo compound of aniline; 3. those from p-nitro-o-toluidine with the diazo compounds of aniline, o- or p-toluidine, p-sulfanilic acid, ρ-toluidinesulfonic acid i, 2,4 or o-toluidinsulfonic acid 1, 2, 5; 4. couples those from m-nitro-p-toluidine with the diazo compound of ρ-toluidine, or b) first according to the patents No. 65651 and 75015 with the last mentioned diazo compounds couples and then converted to azoxyamine dyes.