DE88848C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

In the patent specification no. 84390 a method is described for the production of direct coloring azo-dyes, which consists in using the tetrazo compound of the product of the following constitution:

HO NH

H ₂ N-

HO ₃ S

combined with amines, phenols, etc.

In the patent specification No. 86199 it is then shown that quite generally the mean 2 moles of p-nitroaniline and certain naphthalene derivatives available products of the general constitution:

Cj ₀ H fi-xj

by Tetrazotiren and subsequent combination with m-toluenediamine or ß-naphthol can be converted into real and very intense dyes, their extremely valuable ones Properties are due to the fact that they contain the complex (naphthalene derivative -f 2 mol. p-phenylenediamine residue).

X NC ₆ H ₁ NH ₂ Y N - C ₆ H ₄ NH ₀ N = H) _x N = (SO ₃

= N C ₆ H ₄ NH,

SO ₃ H

With further development of this method, as in patent specification No. 86915 show that dyes are obtained with the same valuable properties, if one uses the isomeric substances of the general formula:

X Y

C ₆ H ₄ NH ₂

N = NC ₆ H ₄ NH ₂ N = NC ₆ H ₃ (SO ₃ H) NH ₂

OH _(x _y,

SO _s H _(x _

the mean 1 mol. p-Nitranilinsulfonic acid and ι Mol. p-Nitraniline from certain naphthalene derivatives are obtained, after tetrazotization combined with m-toluylenediamine.

Thus one obtains dyes of similar valuable properties, if one takes in place

that in the process of patent No. 86915 Tetrazo compound used starts from the tetrazo compound of the substance below Constitution:

HO ₃ S

= NC ₆ H ₁ - NH ₂

= NC ₆ H ₃

/ SO ₃ H

This product can be prepared from P ₁ ß ₂ -amidonaphthol-ß ₃ -sulfonic acid by combining with ι mol. P-nitrodiazobenzenesulfonic acid and p-nitrodiazobenzene and subsequent reduction.

In order to produce the new dye from the same, one proceeds, for example, as follows:

14 kg of the product identified by the above formula becomes 3.5 kg of nitrite on average converted into the tetrazo compound in hydrochloric acid solution. The dark blue solution of the the latter is then allowed to run into a 6.1 kg solution, which is always kept alkaline m-tolylenediamine. The dye is formed immediately and for the most part separates as dark precipitation from. After standing for a long time, warm up and beat the dye down by adding saline solution; it is filtered off, pressed and dried. The dye is a metallic, shiny powder, which is little in cold water, is more easily soluble in hot water with blue color. The aqueous solution becomes the same partly precipitated from alkalis without color change; mineral acids completely beat that free color acid in blue-black flakes. The new dye is insoluble in alcohol; it dissolves in concentrated sulfuric acid with a green-blue color, the solution becomes when diluted first violet-blue, then brown-violet flakes fall; on unheated Cotton, the dye produces intense blue-black tones of in salt and soap baths remarkable authenticity.

Claims (1)

Patent claim: Innovation in the process of patent no. 84390 and its additions, consisting of that instead of the tetrazo compounds used there, the Tetrazo compound of the following constitutional formula: = NC _n HNH ₀ HO ₅ S \OH N = NC ₆ H ₃ SO ₃ H labeled productes combined with 2 mol. m-toluylenediamine.