Manufacture of Blue Dyestuffs Directly Dyeing Cotton.
Year: 1899

page_text: Date of Application, 1st Apr., 1899
Complete Specification Left, 8th Dec., 1899-Accepted, 13th Jan., 1900
PROVISIONAL SPECIFICATION.
Manufacture of Blue Dyestuffs Directly Dyeing Cotton.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, in the County of London, Consulting Engineer and Chartered Patent Agent,
do hereby declare the nature of this invention (as communicated to me from
abroad by Actien Gesellschaft für Anilin Fabrikation, of Berlin, in the Empire
of Germany, Chemical Manufacturers), to be as follows:-
It has previously been shown, for instance in the British Patent No. 25234
of 1897, that direct dyeing colouring matters can be produced by melting with
sulphur and sulphides of alkalies oxynitrodiphenylamine or its homologues, the
shades obtained varying from greenish-black to violet-black
or blue-black
according to the nature of the raw materials used.
My correspondents have now found that by treating the melts obtained by
the above methods and which can be directly used for dyeing, with alcohol in
the heat, there result products which essentially differ from the dyestuffs
directly obtained not only by their tinctorial properties, but also by their whole
chemical and physical character. The products obtained by this treatment with
alcohol dye much clearer and more indigo-blue shades than the raw materials
from which they are prepared. At the same time these new products dissolve
in water with purer and more violet coloration. Whereas the directly obtained
products of the reaction of sulphur and alkalisulphides with the derivatives of
oxynitrodiphenylamine when mixed with ordinary sulphuric acid remain at first
nearly undissolved and only yield, after standing for some time, solutions of
dirty gray-green or gray-blue colour, the dyestuffs obtained by treating the
aforesaid products with alcohol, dissolve easily in cold concentrated sulphuric acid
with a fine blue or violet-blue coloration.
In order to further illustrate the new process the following examples are
given:-
-
1. One part by weight of the melt obtained directly by the process described
in the British Patent No. 25234 of 1897 is boiled with 10 parts of alcohol during
several hours in a vessel connected with a reflux-condenser. The mother-lye
is then filtered off and the residue dried, whereupon the latter can be directly
used for dyeing. It dyes unmordanted cotton fine indigo-blue shades. The
dyestuff dissolves in water with violet colour whereas the raw material used for
its production dissolves with gray-green colour. The solution of the new pro-
duct in concentrated sulphuric acid is of a fine corn-flower-blue colour, whereas
its raw material only dissolves in sulphuric acid after standing, and yields a
dirty green solution.
2. If the dyestuff obtained by melting with sulphur and sulphides of alkalies
dinitrooxydiphenylamine-sulphonic acid, is treated with alcohol in the manner
above described a new colouring matter is produced, which dyes similar țints but

page_text: of a somewhat more violet shade than the product obtained according to exam-
ple 1. The aqueous solution of this dyestuff is red-violet whereas that of its
raw material is grayish-blue. The new dye-stuff dissolves readily in concen-
trated sulphuric acid with blue-violet colour, whereas its raw material only after
standing for some time yields a dirty grayish-blue solution.
3. If the dyestuff obtained by the action of sulphur and sulphides of alkalies
upon dinitrooxydiphenylaminecarboxylic acid is treated with alcohol in the above
described manner a product is produced which likewise dyes cotton indigo-blue
shades. This dyestuff readily dissolves in concentrated sulphuric acid with corn-
flower-blue colour whereas its raw material yields a solution of a dirty grayish-
green colour only after standing for some time; contrary to the dirty grayish-
green solution of the raw material in water, the aqueous solution of the dyestuff
obtained by treatment with alcohol is of a pure blue-violet colour.
Dated this 1st day of April 1899,
ABEL & IMRAY,
Agents for the Applicants.
Manufacture of Blue Dyestuffs Directly Dyeing Cotton.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, in the County of London, Consulting Engineer and Chartered Patent Agent,
do hereby declare the nature of this. invention (as communicated to me from
abroad. by Actien Gesellschaft für Anilin Fabrikation, of Berlin, in the Empire
of Germany, Chemical Manufacturers), and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
It has previously been shown, for instance in the British Patent No. 25234
of 1897, that direct dyeing colouring matters can be produced by melting with
sulphur and sulphides of alkali metals oxynitrodiphenylamine, or its homologues
the shades obtained varying from greenish-black to violet-black or blue-black
according to the nature of the raw materials used.
My correspondents have now found that by treating the melts obtained by
the above methods and which can be directly used for dyeing, with alcohol in
the heat, there result products which essentially differ from the dyestuffs
directly obtained not only by their tinctorial properties, but also by their whole
chemical and physical character. The products obtained by this treatment with
alcohol dye much clearer and more indigo-blue shades than the raw materials
from which they are prepared. At the same time these new products dissolve
in water with purer and more violet coloration. Whereas the directly obtained
products of the reaction of sulphur and alkalisulphides with the derivatives of
oxynitrodiphenylamine when mixed with ordinary sulphuric acid remain at first
nearly undissolved and only yield, after standing for some time, solutions of
dirty gray-green or gray-blue colour, the dyestuff's obtained by treating the
aforesaid products with alcohol, dissolve easily in cold concentrated sulphuric acid
with a fine blue or violet-blue coloration.
In order to further illustrate the new process the following examples are
given:-
1. One part by weight of the melt obtained directly by the process described
in the British Patent No. 25234 of 1897 is boiled with 10 parts of alcohol during
several hours in a vessel connected with a reflux-condenser. The mother-lye

page_text: is then filtered off and the residue dried, whereupon the latter can be directly
used for dyeing. It dyes unmordanted cotton fine indigo-blue shades. The
dyestuff dissolves in water with violet colour whereas the raw material used for
its production dissolves with gray-green colour. The solution of the new pro-
duct in concentrated sulphuric acid is of a fine corn-flower-blue colour, whereas
its raw material only dissolves in sulphuric acid after standing, and yields a
dirty green solution.
2. If the dyestuff obtained by melting with sulphur and sulphides of alkalies
dinitrooxydiphenylamine-sulphonic acid, is treated with alcohol in the manner
above described a new colouring matter is produced which dyes similar tints but
of a somewhat more violet shade than the product obtained according to exam-
ple 1.
The aqueous solution of this dyestuff is red-violet whereas that of its
raw material is grayish-blue. The new dye stuff dissolves readily in concen-
trated sulphuric acid with blue-violet colour, whereas its raw material only after
standing for some time yields a dirty grayish-blue solution.
3. If the dyestuff obtained by the action of sulphur and sulphides of alkalies
upon dinitrooxydiphenylaminecarboxylic acid is treated with alcohol in the above
described manner a product is produced which likewise dyes cotton indigo-blue
shades. This dyestuff readily dissolves in concentrated sulphuric acid with corn-
flower-blue colour whereas its raw material yields a solution of a dirty grayish-
green colour only after standing for some time; contrary to the dirty grayish-
green solution of the raw material in water, the aqueous solution of the dyestuff
obtained by treatment with alcohol is of a pure blue-violet colour.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. The herein described manufacture of blue colouring matters directly dye-
ing cotton by extracting with alcohol and then drying the products obtained
from melting dinitrooxydiphenylamine and its sulphonic and carboxylic acids
with sulphur and sulphides of alkali metals.
2. The products manufactured as above set forth.