DE145907C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

By the patent 57907 a process was known, according to which the dyes of patent 57484, which is derived from zetanaphtholsulfamide sulfonic acid (patent 53934) when treated with alkaline liquids in heat new ones are transferred. As a result, they in and of themselves become disinterested yellow-brown-red monoazo dyes of patent 57484 a little bluer, but significant duller and therefore even less useful as red dyes than the original ones.

If, on the other hand, the products of patent 139287 are treated according to the present process

with alkaline liquids, a very valuable effect is achieved here. It arise new dyes, which are significantly deeper due to their blue to greenish-black color Nuance the rather violet-tinged dyes of patent 139287 still in value surpass. . They represent dark purple to black colored powders, which are in Water with yellow to blue-red, in conc. Dissolve sulfuric acid with a blue-red color.

To prepare these dyes one proceeds, for. B. in the following way:

30 kg of that according to Example 1 of Patent 139287 from picric acid and i-naphthol-8-sulfamide-3-sulfonic acid manufactured color

45

dye
the end
Picric acid
and By heating with soda
in aqueous solution
converted colour
of
Color
fabric colour
the
solution
in
water additive
from
hydrochloric acid
to the
water.
solution additive
from
At the
moniak
to the
water.
solution solution
in
conc.
sulfur
acid At the
Ver
thin
with
water coloring
in the
acidic
Bath ι - naphthol - 8 - sulfamide- '
25 3 - sulfonic acid
(Patent 53934) dark
violet yellow Red yellower
Low
blow unchanged
changes blue red yellower
Low
blow black i -naphthol-8-sulfamide-
4 - sulfonic acid
(Patent 57856) the same the same brown
Low
blow the same the same reddish brown
Low
blow black ι - naphthol - 8 - sulfamide-
3 x 6 - disulfonic acid
- (Patent 69518) * black blue red red-yellow
solution the same the same red-yellow
solution violet
black.

55

60

The substance is dissolved in 100,000 hot water, 100 kg of soda added and so long heated until the original blue-red color of the solution has completely turned yellow-red is. It is then salted out, filtered, pressed and dried. The dye obtained dyes wool deep green-black in a sulfuric acid bath and has an excellent quality Lightfastness.

Instead of using the isolated dye for conversion, you can of course also directly after the combination of picric acid with naphtholsulfamidesulfonic acid excess alkali in the mass

Add! g and warm up the transformation of the original dye in the new one.

In the same way as in the example above, the others can also be omitted Picramic acid and naphtholsulfamidesulfonic acids produced dyes in the new convert.

The table above shows the properties of various methods used in this case produced dyes compiled.

Claims (1)

Patent claim: Process for the representation of black Monoazo dyes !! from the dyes of patent 139287, consisting in that the latter are heated in aqueous solution with alkalis.