The Production of Dye-stuffs on Fibre.
Year: 1896

page_text: BAYER & Co., of Elberfeld, Germany.]
The Production of Dye-stuffs on Fibre.
I HENRY EDWARD NEWTON of The Office for Patents, 6 Bream's Buildings,
Chancery Lane in the County of London, Patent Agent, do hereby declare the
nature of this invention to be as follows:
My foreign correspondents described in the English Letters Patent No 825
4757, 603593, 6035 A³, 8093%, processes for the production of blue thiazinic
coloring matters dyeing with the aid of mordants. These products, which are
known as "brilliant alizarine blues," are of great value for calico printing, owing
to the high degree of fastness against the action of light, and to the beauty of the
shades obtained therewith.
But on being practically employed in calico printing with chrome mordants, the
said dye-stuffs have been found to yield perfect chrome lakes only on steaming the
printing fabrics at high pressure. My foreign correspondents have now discovered
a process for the production, on fibre, of chrome lakes from brilliant alizarine
blue dye-stuffs without pressure, which process consists in printing calico, not with
the brilliant alizarine blues themselves, but with certain intermediate products, and
in subsequently transforming these compounds into the corresponding dye-stuffs on
fibre. The said intermediate products, chemically, are oxindophenol thiosulphonic
acids of the typical formula-"
obtained in the process of manufacturing brilliant alizarine blue dye-stuffs by
means of the methods described in the above mentioned Letters Patent.
For example, on mixing equimolecular quantities of dimethyl paraphenylene
diaminethiosulphonate of sodium, and alpha, beta, naphthoquinone alpha, sulphonate
[Price 8d.]

page_text: of potassium in watery solution (see English Letters Patent No. 4757%), and
intermediate product is instantaneously formed, which has.the formula―
427
The intermediate products produced in the manner are separated from the
obtained liquids by means of common salt in the form of black precipitates. On
being boiled in watery solution with alkalies, or with salts possessing alkaline
properties, the intermediate products are changed into the corresponding brilliant
alizarine blues.
The present invention of my foreign correspondents consists in effecting the
transformation of the said intermediate products into thiazinic coloring matters,
and, at the same time, the formation of chrome lakes of these coloring matters on
fibre, and they have ascertained that the formation of the dye-stuffs, as well as that
of the chrome lakes therefrom, takes place with readiness on steaming without
pressure fabrics printed with a printing paste containing the herein before defined
intermediate products, in combination with chrome salts, and with salts possessing
alkaline properties, such as sodium acetate, sodium thiosulphate, or the like.
In carrying out their new process of producing brilliant alizarine blue dye-stuffs on
fibre, my foreign correspondents, for example, proceed as follows:-
EXAMPLE.
A solution, in 20 parts of water, of 3 parts of the intermediate product obtained
from the interaction of equimolecular proportions of paramidodimethylaniline
thiosulphonate of sodium, and alpha, beta, naphthoquinone-alpha, sulphonate of
potassium in the hereinbefore defined manner, is stirred into 61 parts of neutral
starch-tragacanth-thickening, and 6 parts of a chrome acetate solution of
20 degrees Baumé, and 10 parts of a 25 per cent. sodium thiosulphate solution are
added to this mixture.
The paste thus produced is printed on oiled cloth, which subsequently is steamed
for about one hour without pressure, and then is chalked, malted, and soaped in
the usual manner.
The print thus obtained shows a bright indigo-like colour, and possesses a
remarkable uniformity and great fastness against washing, and even against the
action of a boiling sodium carbonate solution.
Instead of chrome acetate used in the process described in the above example,
other chrome hydroxyde salts may be employed, and the sodium thiosulphate may
be replaced by other salts of weak alkaline properties, such as sodium acetate or
the like. Likewise, other thickenings may be used in the printing process, instead
of starch tragacanth thickening.
The analogous intermediate products "hereinbefore mentioned are employed for
calico-printing in the same manner as that used in the above example.
Dated this 8th day of August 1896.
NEWTON & SON,
Agents for the Applicant.

page_text: I HENRY EDWARD NEWTON of The Office for Patents, 6 Bream's Buildings,
Chancery Lane in the County of London, 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:-
My foreign correspondents described in the English Letters Patent Nos. 82;";
4757; 603593; 60353; & 8093", processes for the production of blue thiazinic
coloring matters dyeing with the aid of mordauts. These products, which are
known as brilliant alizarine blues, are of great value for calico priating, because
of the beauty of the shades obtained, and because they are in a high degree fast
against the action of light.
If employed in calico printing with chrome mordants, the said dye-stuffs yield
perfect chrome lakes when the printed fabrics are subjecte 1 to a steaming operation
at high pressure. My foreign correspondents have now discovered a process
whereby the production of chrome lakes on fibre from brilliant alizarine blue dye-
stuffs may be effected by the steaming operation without pressure, which process
consists in printing the calico, not with the brilliant alizarine blues themselves,
but with certain intermediate products derived therefrom, and in subsequently
transforming these compounds into the corresponding dye-stuffs on the fibre. The
said intermediate products chemically are oxindophenolthiosulphonic acids of the
typical formula-

page_text: The intermediate products produced in this manner are separated by means of
common salt in the form of dark precipitates. When boiled in a watery solution
with alkalies, or with salts possessing alkaline properties, these intermediate
products are changed into the corresponding brilliant alizarine blues.
The present invention of my foreign correspondents consists, then, in effecting
the transformation on the fibre of the said intermediate products, into the chrome
lakes of the corresponding thiazinic colors, in the presence of the above mentioned
salts possessing alkaline properties. The said process is based on the observation
made by my foreign correspondents, that the formation of the dye-stuffs, as well
as that of their chrome lakes, takes place readily on the fibre during the operation
of steaming (without pressure) fabrics printed with a printing paste containing
the hereinbefore defined intermediate products, in combination, with chrome salts,
if the above defined salts possessing alkaline properties, such as sodium acetate,
sodium thiosulphate, or the like, are added to these pastes. If sodium thiosulphate
is used in this process, it is undesirable to add acetic acid to the printing paste for
the purpose of preventing its decomposition.
In carrying out their new process of producing brilliant alizirine blue dye-stuffs,
in the form of their chrome lakes, on fibre, my foreign correspon lents may proceed
as follows:
EXAMPLE.
A solution in 20 parts of water of 3 parts of the intermediate product obtained,
as above indicated, from the interaction of equimolecular proportions of paramido-
dimethylaniline thio sulphonate of sodium and alpha, beta, naphthoquinone alpha,
sulphonate of potassium, is stirred into 61 parts of a neutral starch tragacanth
thickening subsequently 6 parts of a chrome acetate solution, of 20 degrees
Baumé, and 10 parts of a 25 per cent. sodium thiosulphate solution, are added to
this mixture.
The paste thus produced is printed on fabric, which is subsequently steamed for
about one hour without pressure, and then is chalked, malted, and soaped, in the
usual manner.
The print thus obtained shows a bright indigo-like color of remarkable uniformity,
and is fast in a high degree against washing, and even against the action of boiling
sodium carbonate solution.
Instead of chrome acetate used in the process described in the above example,
other chrome hydroxyde salts may be employed, and the sodium thiosulphate may
be replaced by other salts of weak alkaline properties, such as sodium acetate or
the like. Likewise, any other thickening may be used in the printing process,
instead of starch tragacanth thickening.
The analogous intermediate products herein before mentioned are employed for
calico printing in the same manner as that described in the above example. If,
for instance, the intermediate product formed from dimethylparaphenylenediamine-
thiosulphonate of sodium and alpha, beta, naphthoquinone alpha, beta, disulphonic
acid, having the formula-

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me.
from abroad, I declare that what I claim is :-
The process for producing, on fibre, the chrome lakes of the dye-stuffs described
in the Letters Patent Nos. 825, 47573, 6035°, 6035A, & 80933, and known as
"brilliant alizarine blues," which process consists in printing on calico or the like
fabrics, not the brilliant alizarine blues themselves, but the oxyindophenolthio-
sulphonic acids and their derivatives (which are formed as intermediate products.
in the processes described in the above patents), together with chrome salts, and
salts possessing alkaline properties, and subsequently steaming the printed material,.
in order to convert the intermediate products printed on the fibre, into the chrome:
lakes of the corresponding thiazinic dye-stuffs, as set forth.
Dated this Zeh
NEWTON & SON,
Agents for the Applicant..