DE133714C - - Google Patents

Description

IMPERIAL 7i

PATENT OFFICE.

The diazo compounds of p-nitroaniline-sulfonic acid respectively -o-carboxylic acids have not yet been used technically for the preparation of azo dyes been used. In pursuit of the research on these two easily accessible Diazo compounds is the inventor for the preparation of other highly valuable ones Polyazo dyes. If you run on the diazo compounds from these of the amidonaphthol disulfonic acid K represented o-amidoazo dye molecular amounts of tetrazodiphenyl act and combine the resulting intermediate product with phenols or their carboxylic acids, one obtains dyes, dye the cotton green to blue-green in an alkaline bath without staining. Compared to the similarly composed dyes from the unsubstituted p-nitroaniline (cf. English Patent 515/94) are those according to characterized by greater solubility. While the dyes of the English patent fail in the dye bath and uneven dyeings produce, you get very nice level nuances with the new dyes, which also compared to the commercial diamine green dye (D. R. P. 66351) due to better light and alkali fastness are excellent.

Examples:

i. 24 kg ρ nitranilinsulfosaures soda become dissolved in 500 liters of hot water, mixed with 6.9 kg of nitrite after cooling with ice and allowed to run into 30 kg of hydrochloric acid diluted with ice water. The diazotization takes place momentarily taking place, the diazo compound partly precipitating out in crystalline form. For this purpose, a solution of 34.1 kg of the acidic sodium salt of the K-acid is now allowed Run 5.5 kg of soda in 800 l of water and stir for several hours until the coupling has ended is. A solution of 100 kg of crystallized sodium acetate is then added, whereupon a tetrazo solution prepared in the usual way from 18.4 kg of benzidine runs in. The formation of the intermediate product is complete after some stirring. Now let in a solution of 15 kg of salicylic acid in 50 kg of sodium hydroxide solution and 1500 l of water, which also 50 kg of soda were added, run in, after several hours warm up and the dye is precipitated with salt, filtered, prefilled, and dried.

2. 21 kg of nitraniline carbonate of soda become dissolved in 500 l of hot water, cooled with ice and after mixing with 7 kg Nitrite poured into 42 kg of hydrochloric acid diluted with ice water. After the nitrite reaction disappeared and the diazotization event, still through the addition of small amounts of nitrite is completed, a solution of 34.1 kg of the acidic sodium salt of the Run K-acid and 5.5 kg of soda in 800 l of water and stir until the coupling has ended is. The intermediate product thus obtained is then mixed with 100 kg of sodium acetate and The tetrazo solution obtained from 18.4 kg of benzidine runs in the usual way. As soon as no more tetrazodiphenyl can be detected a cold solution of 15 kg of salicylic acid in 50 kg of sodium hydroxide solution and 500 l Add water. After some stirring it is

Dye formation ended. The new trisazo dye is completely dissolved and is made by heating and salting out. if

if necessary, it can be washed out with salt water or by dissolving in hot water and again salting out be cleaned.

composition the end
see solution
in
water on
additive
from
hydrochloric acid on
additive
from
Baking soda
lye solution
in
sulfur
acid on
additive
from
water coloring
on
tree
wool K-acid-p-nitroaniline-
Benzidine <f sulfonic acid
. ^x phenol Brown-
bronzy
powder green bluer
'Down
blow black
precipitation violet
blue bluer
Low
blow green K-acid-p-nitroaniline-
Benzidine ^ sulfonic acid
Salicylic acid the same
the same green theihveise
green
■ precipitation violet
black blue
violet- green
black
Low
blow
blnu-
blacker
■ low,
blow green K-Sllure-p-Nitninilin-
Benzidine ^ sullnslturc
p-Oxy-o-toluic acid the same blooming green blue-
blacker
Low
hit blue am u:. purple
Low
blow blue green K-acid-p-nitroaniline-
Benzidine / carboxylic acid
^ Phenol " the same green Blue violet-
black
Low
blow violet blue green
black
Low
blow gray-green · ■ K-Acid-p-NitraniKn-
Benzidine <f. carboxylic acid
Salicylic acid the same blue green green
black
Low
blow violet violet
blue blue
black
Low
blow gray-green K-acid-p-nitroaniline-
Benzidine ^ carboxylic acid
p-oxy-o-toluic acid green Blue blue
black
Low
blow blue blue gray-blue

Claims (1)

Patent A NSPRU ch: The process of preparing substantive polyazo dyes using the diazo compounds of ρ -nitraniline-o-sulfonic acid or p -nitraniline-o-carboxylic acid, consisting of that one from these diazo compounds with the ι · S-Amidonaphtol-4 · 6-disulfosä'ure K shown o-Amidoazo dyes with the tetrazo compounds of the usual p-diamines in an ■ Essence of alkalis or acids combined into intermediate products and these then either with the oxytoluic acids (D. R. P. 91201) or Salicylic acid or Phenol combined.