DE139286C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

It has been found that with the help of the up to now for the representation of dyes not yet used monoacetyl-ρ-diamidohydroquinonedialkyla'thers

O alkyl

ca

O alkyl

very valuable blue to blue-black dyes can be obtained if one diazotized this ether, with i-naphtylamine-6-respectively. -7-monosulfonic acid combined, the resulting Amidoazo compound further diazotized with 2-naphthol-6-sulfonic acid or with 2-amido-8-naphthol-6-sulfonic acid couples and then splits off the acetyl group.

By using the hydroquinone dialkyl ether instead of the one in the French patent 307719 called p-cresol alkyl ether is a Much greener and purer blue is achieved than before with the aid of diazotization dyes was even possible.

The dyes obtained in this way can be fixed on unstained cotton and give by diazotizing on the fiber and developing with ß-naphtol completely real blue to blue-black colors.

The so far not yet described monoacetyl - ρ - 'diamidohydroquinone dimethyl ether can be obtained by using amidohydroquinone dimethyl ether (see Magatti, Ber. XIV, 71, Mühlhäuser, Ann. 207, 254, Bä'ssler, Ber. XVII, 2119) acetylated and in usual way nitrated and reduced, or if you have the same with a diazo compound combined, the amidoazo compound thus obtained acetylated, then reduced and the Separates components.

The corresponding ethyl ether can be represented in the same way.

Example.

Monoacetyl-ρ-diamidohydroquinone dimethyl ether is diazotized in the usual way and with the equivalent amount of i-naphtylamine-6-respectively. -7-monosulfonic acid coupled. The received The amidoazo compound is then diazotized again and coupled with 2-naphthol-6-sulfonic acid and then split off the acetyl group in the usual way.

The dye thus obtained is a dark powder after drying and colors unheated cotton in blue tones. The color goes when diazotizing on the Fiber and develop into a washable blue with ß-naphtol.

In this example, 2-naphthol-6-sulfonic acid is used replaced by an equivalent amount of 2-amido-8-naphthol-6-sulfonic acid, so gets a blue-black dye which is diazotized on the fiber and developed with the well-known developers, such as ß-naphthol, m-phenylenediamine, m-tolylenediamine, Resorcinol, etc., turns into a true blue-black.

By using the diethyl ether in place of the above-mentioned dimethyl ether only marginally influenced the results.

The characteristic properties of the dyes are summarized in the table below :

Appearance
of
Color
fabric colour
the
solution
in
water To
additive
from
At the
moniak Color of
solution
in conc.
sulfur
acid To
Ver
thin
with
water Direct
coloring
on
tree
wool Diazotized
and ent
wraps
with
ß-naphtol dye
with 2x6-naphthol sulfonic acid metalgl.
dark
powder violet
blue some
bluer blue Red
purple
solution violet
blue greenish
blue Dye with
2 x 8 x 6 - amidonaphthol sulfonic acid dark
brown
powder dark
blue some
bluer blue Red
purple
Low-,
blow dark
blue blue
black.

Claims (1)

Patent claim: Process for the representation of blue to blue-black which can be further diazotized on the fiber Noun secondary disazo dyes from monoacetyl p-diamidohydroquinone dialkyl ether, consisting in that one called ether with ι-naphthylamine-6- or. -7-monosulfonic acid combined, the resulting amidoazo compound is further diazotized with 2-naphthol-6-sulfonic acid or with 2-amido-8-naphthol-6-sulfosa'ure coupled and in the products thus obtained splits off the acetyl group.