DE239916C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 239916 CLASS 22 e. GROUP

KALLE & CO. ACT.-TOTAL in BIEBRICH a. Rh. Process for the preparation of indigoid dyes. Patented in the German Empire on May 15, 1910.

The surprising observation has been made that dialdehydes "as well non-cyclic diketones with 2 moles of bodies of the constitution of indoxyl or oxythionaphthene let condense, and that stable vat dyes are formed in the usual way by conversion into Their leuco compounds are suitable for dyeing animal and vegetable fibers are.

The resulting products have the following general composition:

C - R - C

where R can be eliminated or represents a hydrocarbon radical connecting the two carbon atoms. R ₁ and R ₂ can be hydrogen atoms or hydrocarbon radicals, X and Y identical or different atoms or radicals, such as S, · - NH, O be.

Surprisingly, the bodies obtained in this way have the property that the fiber ever according to the type of dialdehyde, indoxyl or oxythionaphthene used, etc. in color shades, the the. run through the whole range to color. So z. B. when bringing them together of 2 mol. Oxythionaphten with 1 mol. Terephthalaldehyde a crystalline yellow Condensation product of the following constitution:

-CO

C = C-

H > -C = i

C O

The body can easily be turned into a pale yellow color with alkali and hydrosulfite Transfer vat from which the leuco compound on both cotton and wool, colorless to bluish, depending on the degree of alkalinity of the vat. In the case of oxidation, z. B. when hanging in the air, the original forms on the fiber yellow dye back.

Treating 1 mole of glyoxal, ζ. Am

Form of the bisulfite compound, with 2 mol. Oxythionaphten in aqueous or alcoholic Solution, when heated, a body emerges that crystallizes in brownish-red needles, which delivers a dark yellow leuco solution when vatting, which the animal and vegetable fiber stains yellow; when hanging in the air you get deep burgundy red Sounds that make you wash

ίο take on a more yellowish tinge.

In the same way, using indoxyl in place of oxythionaphthene is obtained a blue-violet dye. Instead of 2 mol. Indoxyl or Oxythionaphten one can use the dialdehyde or the Diketone with 1 mole of indoxyl and 1 mole of oxythionaphthene condense. Likewise, in place of the body can depend on the composition of oxythionaphthene or indoxyls their substitution products or similarly composed bodies and in place of the Dialdehydes or diketones their substitution products can be used, as well as substances which under the existing reaction conditions in dialdehydes or diketones in indoxyl, oxythionaphthene and the like.

The reaction can be carried out by heating the reagents alone or in the presence of Solvents or diluents, optionally with the addition of condensing agents be made.

Of the diketones, both aliphatic and aliphatic ones are suitable for this condensation aromatic diketones, e.g. B. diacetyl or benzyl.

Claims (1)

Patent claim: Process for the preparation of indigoid dyes, which are characterized by the general formula X ' consisting in that 2 mol. Of Jfidoxyl, 3_ ^ xy (i) thiona.phten or one Substitution process for these compounds or an analogous body or such substances that these bodies supply, with ι Mol. One, dialdehyde or one not the fat or cyclic dikejxms of the aromatic series or a derivative of this body condenses.