DE267418C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 267418 - CLASS 22 b. GROUP

<L

Patented in the German Empire on October 12, 1912.

It has been shown that you get new valuable vat dyes if you in the amino derivatives of dibenzanthrones (which used to be called cyananthrene B, Violanthren B, Violanthren R extra were in the trade and in the patent specifications 177574, 194252 and 217570 were briefly designated as cyananthrene, violanthrene and isoviolanthrene) Introduces radicals such as alkyls, aryls, alkaryls, aldehyde residues, acid residues and the like. the The vat dyes obtained have different shades than the amino derivatives used

and are generally superior to these in terms of fastness, in particular to oxidizing agents.

The few already known cases in which the introduction of radicals into the amino group dyes originated from other shades, could not give any clues offer that with the amino derivatives used here an extraordinary extensive shift in the nuance, namely z. B. from green to very valuable Bordeaux, will take place. Apart from the

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Dye off Appearance
of the dry
Dye colour
the solution
in
conc. sulfur
acid coloring
on cotton
from the
alkaline
Hydrosulfite vat 20 _f
Aminoviolanthrene + iodoethyl dark brown
powder violet blue burgundy Aminoviolanthrene + benzoyl chloride dark brown
powder blue-violet purple red Aminoviolanthrene + benzyl chloride purple black
powder cloudy blue-violet blue-violet Aminoisoviolanthrene + iodoethyl
30th dark
shiny bronze
powder . blue green violet Aminoisoviolanthrene + benzyl chloride dark
shiny bronze
powder blue green violet 35
Aminoisoviolanthrene + formaldehyde dark
shiny bronze
powder blue green violet

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valuable nuance, the products obtained have a significantly higher authenticity than the starting products, especially excellent chlorine fastness.

Example i.

ι part of aminoviolanthrene (see. Patent 185222) is with 5 parts of Jo'däthyl in the autoclave heated to 150 ° for about 6 hours; then the excess iodoethyl distilled off, the residue dissolved in concentrated sulfuric acid by pouring into Water precipitated, filtered off and made into dough form.

Example 2.

ι part aminoviolanthrene is 10 parts Benzoyl chloride heated to a boil until the development of hydrochloric acid ceased Has; after cooling, the separated reaction product is filtered off with alcohol washed and dried.

Example 3.

3 parts of aminoisoviolanthrene (cf. patent specification 234749) are used in 100 parts of sulfuric acid 66 ° Be. dissolved and slowly added at about 30 ° with 20 parts of 40 percent formaldehyde solution with shaking. The temperature increases to about 100 to 10 °, and the initially green color of the solution changes to blue. To stop the reaction it is heated to 90 to 100 ° for about an hour. The melt is in water poured, the precipitated dye filtered off, washed and made into dough shape.

The properties of those obtained according to the preceding examples as well as some other, Dyes presented in an analogous manner are shown in the table above.

Instead of those mentioned, other radicals can also be converted into the amino compounds mentioned introduce.

Claims (1)

Patent claim: Process for the preparation of vat dyes of the benzanthrone series, consisting of that in the amino derivatives of dibenzanthrones and their derivatives hydrogen of the amino group through Replaced radicals.