New Brown Azo Dye Stuffs, and Method of Producing the same.
Year: 1895

page_text: Date of Application, 1st Aug., 1895
Complete Specification Left, 1st Apr., 1896-Accepted, 2nd May, 1896
[Communicated from abroad by K. OEHLER, of Offenbach a/M., in the Empire
of Germany, Manufacturer.]
New Brown Azo Dye Stuffs, and Method of Producing the same.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
:-
=
By my studies of azo colouring matters derived from diazotated toluylendiamin-
sulpho acid (CH, NH, SO,H: NH, 12:46) I found that not only the
so called paradiamines (benzidine, p-phenylendiamine etc.) are suitable for the
production of azo colouring matters dyeing cotton directly, but that also certain
derivatives of metadiamines can be used for the same purpose.
The Specification of my prior Patent No. 17546 A.D. 1892 shows already bow
to produce brown and orange azo dye stuffs (capable of dyeing cotton directly) by
the aid of diazotated toluylendiaminsulpho acid (derived from 1: 2: 6 meta-
toluylendiamine) and aromatic amines and diamines.
Now I have found, that the orange dye stuff which is produced by the aforesaid
method from toluylendiaminsulpho acid, ẞ naphthylamine and meta phenylene
diamine
can be combined with a further molecule of a diazotated aromatic amido sulpho
acid as for instance diazonaphthionic acid and produces a very fast yellow brown
cotton dye stuff.
Example. 1 produce the dye stuff above formulated from 10.1 parts by
weight of toluylendiaminsulpho acid, 9 parts of chlorhydrate of 3 naphthylamine
and 10-3 parts of sulphate of meta-phenylendiamine to which is added an aqueous
solution of diazonaphthionic acid prepared from 13 parts of naphthionate of
sodium. After stirring for 24 hours the mass is heated and neutralized with soda;
then the dye stuff formed is precipitated by salt, filtered off, pressed and dried.
The new dye stuff forms a dark brown powder soluble in water with yellow brown
Muriatic acid added
and in concentrated sulphuric acid with dirty violet colour.
to the aqueous solution precipitates the dye stuff acid in the shape of brown flakes.
Cotton treated with this dye-stuff is dyed yellow-brown.
When the meta-phenylendiamine above used is substituted by the equivalent
quantity of toluylendiamine, a dye stuff is obtained which dyes unmordanted cotton
yellow brown of a very clear shade.
Dated this 1st day of August. 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.

page_text: I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, 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:-
:
In my studies of azo colouring matters derived from diazotized toluylene-
diamine-sulpho-acid (CH, NH, SO,H: NH, = 1:2:4:6) I found that not
only the so called paradiamines (benzidine, para-phenylene-diamine, and the like)
are suitable for the production of azo-colouring matters, dyeing cotton directly,
but that also certain derivatives of meta-diamines can be used for the same
purpose.
In the Specification of my British Patent No. 17546 of 1892 1 have already
described the method of producing brown and orange azo-dyestuffs (dyeing cotton
directly) by the aid of diazotized toluylene-diamine sulpho-acid derived from
1:26 meta-toluylene-diamine and aromatic amines and diamines.
Now I have found that the orange dyestuff, which is to be produced by the
method of this Patent from toluylendiamine sulphoacid, ẞ-naphthyl-amine and
meta-phenylenediamine.
can be combined with a further molecule of a diazotized aromatic amido sulpho
acid as for instance diazonaphthionic acid, and produces a very fast yellow brown
cotton dyestuff.
Example. I produce the dyestuff above formulated, from 10.1 parts by weight
of toluylene-diamine-sulphoacid, 9 parts of chlorhydrate of ẞ naphthylamine
and 103 parts of sulphate of meta-phenylene-diamine and add to it an aqueous
solution of diazo naphthionic acid prepared from 13 parts of naphthionate of sodium.
After stirring for 24 hours, the mass is heated and neutralized with soda; then the
dyestuff formed is precipitated by salt filtered off, pressed and dried.
The new dyestuff forms a dark brown powder, soluble in water with a yellow
brown and in concentrated sulphuric acid with a dirty violet colour; muriatic acid
added to the aqueous solution precipitates the dye-stuff acid in the shape of brown
flakes. Cotton is dyed yellow brown.
When the meta-phenylene-diamine, above used is substituted by an equivalent
quantity of toluylene diamine, a dyestuff is obtained which dyes unmordanted
cotton yellow brown of a very clear shade.
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
by my foreign correspondent, I declare that what I claim is :-
1. The method of producing new brown azo-dyestuffs by the combination of
one molecule of a diazotized aromatic amido-sulpho acid with the mixed tetrazo
dyestuffs

page_text: 2. As a new article of manufacture the new brown azo-dyestuffs, produced by
the method described in Claim 1.
Dated this 1st day of Avril 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.