DE156828C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

In patent specification 150373 it has been shown that from the diamidochlorobenzenesulfonic acid (N: N: Cl : S = 1: 3: 2: 5) by tetrazotizing and combining the tetrazo compound in the presence of alkalis or. Hydrochloric acid binding agents with 2 molecules of the same or two different chromogens are obtained after-chromable disazo dyes which are identical to those obtained from the tetrazo compound of oo-diamidophenolsulfonic acid.

It has now been shown that the diamidochlorobenzenesulfonic acid of the formula

Cl

NH ₁ ,

NH-,

which by reducing the 1 · 3 - dinitro - 4 · 5 - chlorobenzenesulf described in patent 116339 Acid can be obtained showing a very similar behavior by the tetrazo compound this diamido acid with chromogens in the presence of alkalis or hydrochloric acid binding agents Agents combined do not provide the corresponding chlorine-containing disazo dyes, but combinations which are identical are with those derived from the tetrazo compound of the corresponding diamidophenolsulfonic acid develop.

35

The procedure is illustrated by the following examples:

Example 1.

Representation of the 1 · 3-Diamido-4 · 5-

chlorobenzenesulfonic acid.
15 parts of dinitrochlorobenzenesulfonate are gradually introduced into 100 parts of hot water to which 30 parts of iron and 1 part of acetic acid have previously been added. After the reduction has taken place, 1.3 parts of soda are made alkaline and the diamidochlorobenzenesulfonic acid is precipitated from the liquor filtered off from the iron sludge after prior concentration. It is difficult to dissolve in cold water, and more easily soluble in hot water, from which it crystallizes in colorless needles on cooling. It is easily soluble in dilute alkalis and in sodium acetate and is separated out again by adding mineral acids. It gives a yellow tetrazo compound.

Example 2.

Tetrazotization of I · 3'-Diamido-4 · 5-chlorobenzenesulfonic acid and coupling with 2 molecules of β-naphtol with counter-

waiting for alkali.

To a suspension of 11.1 parts of hydrochloric acid Diamidochlorbenzolsulf 21 ⁰ B. osäure and 20 parts in 120 parts of water

a concentrated aqueous solution of 7 parts of sodium nitrite is slowly added gradually with stirring. ^{The tetrazo solution obtained in this way is poured onto ice, made clearly alkaline at 0} ° with soda and then immediately added to a solution of 14.5 parts of β-naphthol in 13 parts of 40% sodium hydroxide solution and 125 parts of water. After stirring for 10 to 12 hours at normal temperature, the mixture is boiled and the black powder has completely separated out

Filtered dye, washed, pressed and dried.

It dissolves in water with a purple-black color, which is due to the addition of mineral acids turns dark red, turns blue when a little soda is added. The nuance of the direct coloring is red-brown and goes with Chromium plating in black over.

For the representation of the other combinations, the information in the main patent, authoritative. -

Combination of with soda
treated tetrazo compound of op-diamidochlorobenzene sulfonic acid with

solubility in water

on

additive

of soda on the addition of dilute mineral acid

Color of the solution in concentrated sulfur

nuance

the

direct

coloring

on wool

nuance

the, chro-

mated

coloring

on wool

nuance

the

coppered

coloring

on wool

2 molecules of ß-naphthol sulfonic acid Schäffer

violet blue

purple-blue red solution

red-violet

red-brown

purple black

blackish purple

2 molecules of m - phenylenediamine

yellow-brown

red-brown

ι Molecule ß-Naphtholdisulfonic acid R and 1 molecule ß-naphtol

blue

violet brown precipitate

dirty red solution

i red-brown

yellow-brown

Brown

ι Molecule of a-naphthol sulfonic acid ι · \ and 1 Molecule of ß-naphtol

violet blue

violet violet-blue precipitate

1 molecule of ci-naphthol sulfonic acid 1 -4 and 1 molecule ι · 8 · 4-amidonaphthol sulfonic acid

dark blue

ι molecule ß-naphthol-

sulfonic acid Schäffer and

ι Molecule ß-naphtol

violet

1 molecule of naphthionic acid and 1 molecule
β - naphtol

wine red

violet-blue partly violet-blue precipitation

purple claret solution

claret red precipitation

reddish brown

deep

violet blue

purple brown

purple black

purple black

deep blue-violet

reddish purple

purple black

cloudy purple

deep blue

bluish purple

blackish green

blackish blue

violet blue

red-brown

purple black

blackish purple

violet blue

brownish red

yellow-brown

red-brown.

Claims (1)

Patent claim: 'Modification in the procedure of patent specification 150373 for representation according to-' chromable disazo dyes, consisting of that instead of m-diamidochlorobenzenesulfonic acid (N: N: Cl: S = 1: 3: 2: 5) here the isomeric acid (N: N: Cl: S = 1: 3: 4: 5) applies.