The Manufacture or Production of Substantive Disazo Colouring Matters.
Year: 1897

page_text: Date of Application, 22nd Feb., 1897
Complete Specification Left, 6th Nov., 1897-Accepted, 11th Dec., 1897
[Communicated from abroad by THE CHEMICAL WORKS, formerly Sandoz, Basle,
Switzerland.]
The Manufacture or Production of Substantive Disazo Colouring
Matters.
WILLIAM GEORGE HEYS of 70 Market Street Manchester in the county of
Lancaster, Chartered Patent Agent, do hereby declare the nature of this invention
to be as follows:
The Disazo Colouring Matters described in the Specification of German Letters
Patent No. 58076 which are derived from one molecule of the Tetrazo Compound of
a Paradiamine and two molecules of the 1. Naphthol 3:6:8 Trisulphonic Acid
described in the Specificaton of German Letters Patent No. 56058 are, although
of bright shade, not adapted for dyeing unmordanted cotton, the accumulation of
the sulpho groups having abolished the affinity for cotton fibres.
My Foreign Correspondents have found that they can obtain good, direct dyeing
Colouring matters for Cotton, by combining Terazo bodies of Paradiamines, such
as Benzidine, Tolidine, Dianisidine, Ethoxybenzidine, or Diphenetidine, with
only one molecule of the before mentioned Naphthol Trisulphonic Acid, and by
afterwards combining the intermediate product with one molecule of beta-Naphthol.
The Colouring Matters thus formed are of superior solubility and brightness as
compared with the analogous Colouring Matters obtained from Tetrazo bodies, one
molecule of Naphthol Disulphonic Acids and one molecule of beta-Naphthol.
In carrying out their Invention my Foreign Correspondents may proceed as
follows:-
EXAMPLE I.
24.4 kilos of Dianisidine are dissolved in 300 litres of Water acidulated with
58 kilos of Hydrochloric Acid 21°Be., and are diazotised in the usual manner, by
the addition of 13.8 kilos of Sodium Nitrite, at a temperature of from 0° to 5°C.
There are then added 45 kilos of the Tri-sodium salt of 1. Naphthol 3:6:8 Tri-
sulphonic Acid dissolved in 800 litres of water cooled to 0°C, slowly and with
continued stirring. The mixture is then rendered alkaline by the addition of
35 kilos of Soda Ash dissolved in 250 litres of Water. The intermediate product,
in the state of a blueish red solution, is formed instantaneously. After it has
been stirred for from three to five minutes, there is added to it a cold solution
prepared from 14.4 kilos of beta-Naphthol and 4 kilos of Caustic Soda in 100 litres
of water. The original blueish red colour thereupon changes to a pure blue.
After the solution has stood for some hours, the new Colouring Matter can be
precipitated by heating in a closed chamber with the addition of common salt, to
temperature of 110° C., under steam. It is filtered whilst hot, and the product
s pressed and dried.

page_text: The Colouring Matter so produced is easily soluble in water with a pure blue
shade which is not modified by the addition of soda. It is however changed to
reddish violet by the addition of Caustic Soda. It dissolves in strong Sulphuric
Acid, with a greenish blue shade, and by the addition of water to this solution,
the violet Sulpho Acid of the new Colouring Matter is precipitated. Bright blue
shades ranging between those of Diamine Blue 2B and 3B are dyed on unmor-
danted Cotton by the new Colouring Matter in a boiling salt or Glauber salt bath,
which may be rendered alkaline to a slight extent by the addition of soda, soap,
or phosphate of soda.
D
.
L 3
The Manufacture or Production of Substantive Disazo Colouring
Matters.
I, WILLIAM GEORGE HEYS of 70 Market Street Manchester in the county of
Lancaster, Chartered Patent Agent do hereby declare the nature of this invention,
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement.
The disazo colouring matters described in the Specification of German Letters
Patent No. 58076, which are derived from one molecule of the tetrazo compound
of a paradiamine and two molecules of 1. naphthol 3:6:8 trisulphonic acid des-
cribed in the Specification of German Letters Patent No. 56058 are, although of
a bright shade, not adapted for dyeing unmordanted cotton, the accumulation of
the sulpho groups having abolished the affinity for cotton fibres.
My foreign correspondents have found that they can obtain good, direct dyeing,
cclouring matters for cotton, by combining tetrazo-bodies if paradiamines such as
benzidine, tolidine, dianisidine, ethoxybenzidine or diphenetidine, with only one
molecule of the before mentioned naphthol trisulphonic acid and by afterwards
combining the intermediate product with one molecule of beta-naphthol.
colouring matters thus formed are of superior solubilty and brightness as com-
pared with the analogous colouring matters obtained from tetrazo-bodies, one mole-
cule of naphthol disulphonic acids and one molecule of beta-naphthol.
The
In carrying out their invention, my foreign correspondents may proceed as
follows:
EXAMPLE.
24.4 kilos of dianisidine are dissolved in 300 litres of water acidulated with 58
kilos of hydrochloric acid 21° Be., and are diazotised in the usual manner by the
addition of 13.8 kilos of sodium nitrite at a temperature of from 0° to 5º C. There
are then added 45 kilos of the tri-sodium salt of 1. naphthol 3:6:8 trisulphonic
acid dissolved in 800 litres of water cooled to 0°C., slowly and with continued
stirring. The mixture is then rendered alkaline by the addition of 35 kilos of
soda-ash dissolved in 250 litres of water. The intermediate product, in the state
of a blueish red solution, is formed instantaneously. After it has been stirred
for from three to five minutes, there is added to it a cold solution prepared from
14.4 kilos of beta-naphthol and 4 kilos of caustic soda in 100 litres of water.
original blueish-red colour thereupon changes to a pure blue. After the solution
has stood for some hours, the new colouring matter can be precipitated by heating
The

page_text: in a closed chamber with the addition of common salt, to a temperature of 110° C.,
under steam. It is filtered whilst hot, and the product is pressed and dried.
The colouring matter so produced is easily soluble in water with a pure blue
shade which is not modified by the addition of soda. It is however changed to a
reddish-violet by the addition of caustic soda. It dissolves in strong sulphuric
acid with a greenish blue shade, and by the addition of water to this solution,
the violet sulphonic acid of the new colouring matter is precipitated. Bright blue
shades ranging between those of diamine blue 2B and 3B are dyed on unmordanted
cotton by the new colouring matter in a boiling salt or glauber salt bath, which
may be rendered alkaline to a slight extent by the addition of soda, soap, or
phosphate of soda.
In an analogous manner, as set forth in the above Example, similar disazo
colours are obtained by substituting the dianisidine by equimolecular proportions
of benzidine, tolidine, ethoxybenzidine or diphenetidine. The combination derived
from benzidine dyes unmordanted cotton in pure violet shades, and the analogous
tolidine dye-stuff gives violet-blue shades.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is:-
1. The hereinbefore described process for the production of colouring matters
dyeing violet to blue shades, which consists in the combination of one molecule
of the tetrazo compounds of paradiamines such as benzidine, tolidine, ethoxy-
benzidine and diamidodiphenolethers in a soda alkaline solution with one molecule
of 1.naphthol 3:6:8 trisulphonic acid and in combining the intermediate product
thus formed with one molecule of beta-naphthol, substantially as set forth.
2. As new substances, the new dyestuffs produced as and by the processes
hereinbefore described.