DE229303C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- Jig-229303 - CLASS 22 β. GROUP

by means of aniinohydroquinone dialkyl ether.

Patented in the German Empire on December 30, 1908.

It has been shown that the aminohydroquinone dialkyl ethers of the following constitution:

O · Alk

ίο Ο · Alk

Use as a middle component in the manufacture of polyazo dyes permit. In this way, dyes are obtained! 5, for example, of the following typical constitution:

O -alk

R - N =

In these formulas, R denotes the radical of an aromatic diazo compound, R ₁ one of the final components customary for the preparation of azo dyes; Both the radicals R and ^ _{1 can} contain sulfo groups, or sulfo groups can only be present in one of them, that is to say either in R or in R ₁ . ^:

If component R also contains a nitro group or an acetylamino group, the nitro group in the end product obtained can be reduced by mildly reducing agents or the acetyl group can be split off by the action of alkalis or acids, so that dyes with the following typical composition are formed:

O -alk

= Ν - R ₁

35

40

45

I.
O.Alk

Although it is from patent specification 109491, Addition to patents 95530, already known that aminohydroquinone ethers are in the middle Component can apply; but the dyes described there are products of a different constitution and other properties. The dyes described in patent specification 109491 are - just like the products of the main patent known under the name Janus colors 95530 and the other additional patents

to this patent - basic disazo dyes, which are characterized by the fact that their first Component of an ammonium base is that they do not contain sulfo groups, tannic Dye cotton as well as pull it on cotton in an acid bath.

In contrast to this are the dyes that can be prepared by the present process substantive cotton dyes containing sulfo groups.

Example i.

23.1 parts of crystall. sulfanilic acid sodium are concentrated with 30 parts. Hydrochloric acid, 7 parts Sodium nitrite and diazotized with a solution of 15.5 parts of aminohydroquinone dimethyl ether in 12 parts conc. Hydrochloric acid combined. Then continue with 7 parts of sodium nitrite diazotized and the diazo solution to a solution of 24 parts of 2-5-AmInOUaPMoI ^ -SuIfO-acid run along with 17 parts of soda. When the combination is complete, the dye salted out with table salt. The dye thus obtained dyes unstained cotton in blue-violet tones.

Example 2.

the above case

in

Replace one
If the 2 · 5-aminonaphthol-7-sulfonic acid is replaced by 31.6 parts of 2-phenylamino-5-naphthol-7-sulfonic acid, a dye is obtained which dyes unstained cotton with a slightly more bluish shade than the dye of Example 1.

Example 3.

If you use in the preparation of the dyes instead of sulfanilic acid as in example ι in the first place 24.1 parts of 2 · 5-dichloroaniline-4-sulfonic acid on, the result is a dye that turns unstained cotton blue.

Example 4.

70 parts of p-nitroaniline are mixed with 150 parts conc. Hydrochloric acid, 35 parts of sodium nitrite and diazotized with a solution of 77.5 parts Aminohydroquinone dimethyl ether in 60 parts of conc. Hydrochloric acid combined. Then with 35 parts of sodium nitrite are further diazotized and the diazo solution to a solution of 120 parts 2 · 8-aminonaphthol-6-sulfonic acid together with 40 parts of soda run. After the combination has been made the dye solution is mixed with a solution of 18 parts of sodium sulphide (crystalline) heated and, after the reduction of the nitro group, the dye is salted out with common salt. It produces blue-black tones on unheated cotton. The colorations obtained can be diazotized on the fiber and deliver with subsequent development, z. B. with m-toluenediamine, a very strong black.

Instead of the aminohydroquinone dimethyl ether used in the previous example The aminohydroquinone diethyl ether can also be used with a similar result.

Claims (1)

Patent claim: The method comprising for the preparation of sulfo secondary disazo means Aminohydrochinondialkyläther consisting in that ι Mol. A diazo compound with Aminohydrochinondialkyläther combined diazötiert the resulting aminoazo dye and combined with a customary for the preparation of 75j azo dyes Schlußkom- ^v component, wherein the sulpho groups in either the initial component or the final component or both.