DE183331C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 22 «. GROUP

in Basel.

Process for the preparation of o-oxymonoazo dyes.

Addendum to patent 181326 of May 10, 1904.

Patented in the German Empire on July 1, 1904. Longest duration: May 9, 1919.

Patent 181326 describes a process for the preparation of chromable o-oxyazo dyes, which consists in that the i-diazo-2-naphtolsulfosäureh obtainable according to patent 171024 bezw. Sulphonic acids of naphthalene-i-2-diazooxide combined with naphthols, their monosulpho- and carboxylic acids, aminonaphthols and their sulphonic acids, dioxynaphthalenes and their sulfo acids and resorcinol. As further investigations have now shown, in addition to the body classes mentioned, the m-aminophenols and m-diamines are also able to combine with great ease with the diazo compounds mentioned to form technically also very valuable dyes. The coupling of the diazo sulfonic acids with the diamines occurs particularly easily in the present cases in acetic acid or at least neutral solution, but with the aminophenols it is most expedient in the presence of quicklime.

The dyes obtainable in this way dye wool from an acetic acid bath in brick red to dark brown purple Tones, which by subsequent treatment with potassium dichromate in violet to greenish black, with copper sulfate in brownish to black-violet nuances of very good light and chrome Dyeings, some of which have excellent mill and potting fastness, pass over.

Examples:

1. 300 l of a solution containing 14.5 kg Hydrochloric acid m-aminophenol is mixed with 40 kg of 25 percent milk of lime while stirring, whereupon 30 kg of barium salt of I-diazo-2-naphthol-6-sulfonic acid enters. When the combination is complete, it is diluted with water, boiled and the deep red solution filtered. After the addition of hydrochloric acid to the filtrate, it becomes a dark red-brown precipitate precipitated dye filtered off, washed out, then dissolved in ammonia and evaporated to dryness.

2. 12 kg of m-tolylenediamine and 36 kg acid sodium salt of i-diazo-2-riaphthol-4-6-disulfonic acid are together with stirring and the addition of 5 kg of 40 percent acetic acid dissolved in 50 l of water. The combination is completed in a few hours at a temperature of 25 ° C, whereupon the dark brown, slightly metallic green-glossy solution acidified with hydrochloric acid and with Saline solution added. The dye which separates out as a red-brown precipitate is filtered off, pressed and dried.

Of the dyes obtainable by the above process, a number are with their properties and the nuances of their direct chrome-plated and copper-plated The colors are compiled in the table below.

Diazo compound
the end Coupled
with Appearance
of
dry
Dye Farl
in
water ae of his loos
on addition
hydrochloric acid ung
from
■ ammonia solution
in conc
trotter
sulfur
acid nuance
the end
acetic acid
Bath the coloring
really
chromed on wool
after-
coppered ι-amino-2-naphthol-
4-sulfonic acid m-amino
phenol brownish green
shiny. powder brownish red brown
Precipitation blue-violet red-violet dark brown black with
Violet cast dark purple the same m-amino
cresol red-brown powder brown-red " brownish red
Precipitation violet blue red-violet dark brown black with
Violet cast black
violet the same m-phenylene
diamine dark brown
powder Brown reddish brown
Precipitation Red violet brownish red brownish
black dark
brown purple the same m-toluylene
diamine blackish green
powder reddish brown yellowish brown
Precipitation Red violet red-brown greenish
black dark
brown purple i-amino-2-naphthol-
6-sulfonic acid m-amino
phenol greenish black
shiny powder Brown black-brown
Precipitation blue-violet fuchsin red red-brown black with
Violet cast dark purple the same m-amino
cresol greenish black
shiny powder Brown reddish brown
Precipitation dark-
violet blue fuchsin red Brown violet
black dark purple ι -Amino-2-naphtol-
3-6-disulfonic acid m-amino
phenol greenish black
powder brownish red red solution
with brown
Precipitation blue bluish red brownish
violet blue-gray vivid purple the same m-amino
cresol greenish black
shiny powder Brown brownish red
Precipitation violet blue fuchsin red dark
brown purple dark
blue-gray dark purple also · m-phenylene
diamine greenish black
powder Brown brown
Precipitation Red scarlet Brown reddish gray brown purple 'i-amino-2-naphthol-
4-6-disulfonic acid m-amino
phenol dark green brown
powder Brown brownish red fuchsin red blue red brownish red blue-gray vivid purple the same m-phenylene
diamine red-brown powder Brown yellowish brown
Precipitation yellow Red Red brick red grey black dark purple the same m-toluylene
diamine red-brown powder reddish brown reddish yellow
Precipitation Red ponceau red red-brown grey black dark purple

Claims (1)

Patent claim: Innovation in the process of the patent 181326 for the representation of re-chromable and post-copperable o-oxymonoazo dyes, consisting of that instead of the azo dye components mentioned therein, m-aminophenols and m-diamines with i-diazo-2-naphthol sulfonic acids or sulfonic acids of naphthalene-i-2-diazooxide in the one obtainable by the method of patent 171024 Combined form.