Improvements in the Manufacture of Colouring Matters.
Year: 1893

page_text: Date of Application, 3rd Aug., 1893
Complete Specification Left, 28th Apr., 1894-Accepted, 2nd June, 1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE ACTIEN GESELLSCHAFT FÜR ANILIN
FABRIKATION, of Berlin, in the Empire of Germany, Chemical Manu-
facturers.]
Improvements in the Manufacture of Colouring Matters.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, in the County
of London, Consulting Engineer and Chartered Patent Agent, do hereby declare
the nature of this invention to be as follows:-
:-
This invention relates to the manufacture of black tetrazo dye stuff's capable of
directly dyeing unmordanted cotton.
Hitherto the dyeing of deep black shades on unmorlanted cotton by means of
the so called substantive dyes-as for instance diamine black and the like-could
only be effected by rediazotising these substances on the fibre and afterwards
developing with certain amines or phenols and the like.
Now, my foreign correspondents have discovered a series of new tetrazo dyes,
which in tinctorial power greatly surpass the above mentioned substances.
In dyeing cotton with these new colouring matters, it is possible to obtain deep
black shades directly in a single bath without diazotation or development which
always render the dyeing process more complex.
The process of preparing these colours may be illustrated by the following
example:
212 kilos. tolidine are converted in the well known manner into tetrazo-ditolyl
salt. The tetrazo compound obtained is poured into a solution of 32 kilos.
amido-naphtholdisulpho acid (described in the Specification No. 15175 of 1889)
and 30 kilos. sodium carbonate. As soon as the formation of the intermediate
product is completed, 90 kilos. hydrochloric acid at 20° B. are added and the product
is rediazotised by means of 7 kilos. sodium nitrite.
The new
tetrazo compound obtained is allowed to run into a solution
containing 30 kilos. m. toluylen diamine and 30 kilos. sodium carbonate.
After stirring for some hours the solution is boiled and the dye stuff is precipitated
by the addition of common salt, filtered off, pressed and dried.
The colouring matter produced in this way dyes unmordanted cotton in a soap
or salt bath a deep black colour. It is distinguished by remarkable fastness against
acids and alkalies.
Instead of tolidine, other paradiamines, as for instance benzidine or dianisidine.
may be used, and for the m. toluylendiamine may be substituted m-phenylen-
diamine or resorcine.
1000
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Colouring Matters.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, in the County
of London, Consulting Engineer and Chartered Patent Agent, do hereby
40 declare the nature of this invention and in what manner the same is to be
[Price 8d.]

page_text: performed to be particularly described and ascertained in and by the following
statement:-
This invention relates to the manufacture of black tetrazo dye stuff's capable of
directly dyeing unmordanted cotton.
Hitherto the dyeing of deep black shades on unmordanted cotton by means of
the so called substantive dyes-as for instance diamine black and the like-could
only be effected by rediazotising these substances on the fibre and afterwards
developing with certain amines or phenols and the like.
Now, my foreign correspondents have discovered a series of new tetrazo dyes,
which in tinctorial power greatly surpass the above mentioned substances.
In dyeing cotton with these new colouring matters, it is possible to obtain deep
black shades directly in a single bath without diazotation or development which
always render the dyeing process more complex.
The process of preparing these colours may be illustrated by the following
example:
212 kilos. tolidine are converted in the well known manner into tetrazo-ditolyl
salt. The tetrazo compound obtained' is poured into a solution of 32 kilos. amido-
naphtholdisulpho acid (described in the Specification No. 15175 of 1889)
and 30 kilos. sodium carbonate. As soon as the formation of the intermediate
product is completed, 90 kilos. hydrochloric acid, at 20° Be., are added and the
product is rediazotised by means of 7 kilos. sodium nitrite.
The new
tetrazo compound obtained is allowed to run into a solution
containing 30 kilos. m. toluylendiamine and 30 kilos. sodium carbonate.
After stirring for some hours the solution is boiled and the dye stuff is precipitated
by the addition of common salt, filtered off, pressed and dried.
The colouring matter produced in this way dyes unmordanted cotton in a soap
or salt bath a deep black colour. It is distinguished by remarkable fastness against
acids and alkalies.
Similar colouring matters are obtained if, instead of tolidine, other paradiamines
as for instance, benzidine, dianisidine are used, and if for the meta-toluylendiamine
is substituted meta-phenylendiamine or resorcine.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
:-
1. The herein described manufacture of colouring matters from amidonaphtoldi-
sulpho acid by combining one molecule of the tetrazo compounds of paradiamines
with one molecule of the said acid, rediazotising the intermediate product thus
obtained, and combining it with two molecules of meta-toluylendiamine, meta-
phenylendiamine or resorcin.
2. The colouring matters produced by the process above referred to.
ABEL & IMRAY,
Agents for Applicant.