The Manufacture or Production of Colouring Matters for Cotton.
Year: 1898

page_text: Date of Application, 3rd Mar., 1898
Complete Specification Left, 15th Nov., 1898-Accepted, 4th Feb., 1899
.
[Communicated from abroad by THE FARBENFABRIKEN vormals FRIEDRICH
BAYER & Co., of Elberfeld, Germany.]
The Manufacture or Production of Colouring Matters for Cotton.
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 have found that valuable tetrazo dyestuffs are
obtained, if the tetrazo derivatives of diamido-dibenzyl disulphonic acid, having
the formula
2
(produced by reducing the dinitrobenzyldisulphonic acid described in the "Berichte
der Deutschen Chemischen Gesellschaft," vol. 30, p. 3099)—are combined with a
nitrometadiamine of the benzene series, such as nitrometaphenylenediamine (see
'Berichte," vol. VII., page 1259), nitrometatoluylenediamine (see "Berichte"
.vol. VIII., p. 1211, and vol. III., p. 219), or the like.
68
In order to illustrate the new process, the following example is given, the parts
being he resight

page_text: To the resulting tetrazo solution, a boiling solution, prepared from 35 parts of
nitrometaphenylenediamine, 35 parts of concentrated hydrochloric acid, and
1500 parts of water, is added, while well stirring. The reaction mixture is
further stirred for about 6 hours, at about 60 degrees Centigrade. Subsequently
it is filtered and the residue remaining on the filter is dissolved with the aid of
a hot sodium carbonate solution. From the resulting solution the finished dye-
stuff is separated by adding a hot solution of common salt. Finally, the coloring
matter is filtered, pressed, dried, and pulverized.
It dyes unmordanted cotton bright yellow shades, which are fast against
alkalies and acids.
On substituting nitrometatoluylenediamine for the nitrometaphenylenedia-
mine used in the above example, a similar result is obtained.
It may be remarked that for the production of the new dyestuffs, my foreign
correspondents do not limit themselves to the particulars given in the above
example, as this is merely typical.
Dated this 3rd day of March 1898.
NEWTON & SON,
Agents for the Applicant.
The Manufacture or Production of Colouring Matters for Cotton.
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 have found that valuable tetrazo dyestuffs are
obtained if the tetražo derivatives of diamido-dibenzyl disulphonic acid, having
the formula:

page_text: (produced by reducing the dinitrodibenzyldisulphonic acid described in the "Berichte
der Deutschen Chemischen Gesellschaft," vol. 30, p. 3099) are combined with a
nitrometadiamine of the benzene series, such as nitrometaphenylenediamine (see
"Berichte," vol. VII., p. 1259), nitrometatoluylenediamine (see "Berichte"
vol. VIII., p. 1211, and vol. III., p. 219), or the like.
In order to illustrate the new process, the following example is given, the parts
being by weight:-
EXAMPLE.
37 parts of diamidodibenzyldisulphonic acid are diazotised in the usual
manner by means of 14 parts of sodium nitrite and 45 parts of concentrated
hydrochloric acid (containing 365 per cent. of HCI).
To the resulting tetrazo solution is added a boiling solution prepared from 35 parts
of nitrometaphenylenediamine, 35 parts of concentrated hydrochloric acid, and
1500 parts of water, the mixture being well stirred all the time. The reaction mix-
ture is further stirred for about 6 hours, at about 60 degrees Centigrade. Subse-
quently it is filtered, and the residue remaining on the filter is dissolved with the aid
of a hot sodium carbonate solution. From the resulting solution, the finished dye-
stuff is separated by adding a hot solution of common salt. Finally, the colouring
matter is filtered, pressed, dried, and pulverized.
It dyes unmordanted cotton bright yellow shades, which are fast against
alkalies and acids.
On substituting, nitrometatoluylenediamine for nitrometaphenylenediamine
used in the above example, a similar result is obtained.
It may be remarked that for the production of the new dyestuffs, my foreign
correspondents do not limit themselves to the particulars given in the above
example, as this is merely typical.
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 :-
1. The process for producing new tetrazo dyestuffs consisting in combining one
molecule of a tetrazo derivative of diamidodi benyldisulphonic acid with two
molecules of a nitrometadiamine of the benzene series, substantially as herein-
before described.
2. As new articles of manufacture, the new tetrazo dyestuffs herein before defined,
Dated this 14th day of November 1898.
NEWTON & SON,
Agents for the Applicant.