The Production of Polyazo-dyestuffs from Gamma-amidonaphtol- sulpho Acid.
Year: 1894

page_text: Date of Application, 15th May, 1894
Complete Specification Left, 14th Feb., 1895-Accepted, 16th Mar., 1895
PROVISIONAL SPECIFICATION.
The Production of Polyazo-dyestuffs from Gamma-amidonaphtol-
sulpho Acid.
I, SYDNEY PITT, of Sutton in the County of Surrey, Gentleman, (a communi-
cation to me from abroad by Leopold Cassella & Co. of 19 Liebigstrasse,
Frankfort-on-Main in the Empire of Germany) do hereby declare the nature of
this invention to be as follows:
In the British Patent No. 193300 a group of new tetrazo compounds has been
described which are derived from gamma-amidonaphtol sulpho acid of the general
constitution:
узаштанаритоточерно во
In the same Patent it has further been shown that these tetrazo compounds may
be used in place of the tetrazo compounds used in the process of the British
Patent No. 166999. My correspondents have now discovered some new combina-
tions of this class.
The British Patent No. 166998 describes the production of mixed dye-stuffs from
5 one molecule of a tetrazo compound, one molecule of gamma-amidonaphtolsulpho
acid and one molecule of an amine or phenole. The dye-stuffs of the present
application belonging to this group have the composition:
y-amidonaphtolsulpho acid-(a)-R
in which (a) means the above named tetrazo compound and R a phenole or amine.
The British Patent No. 1933000 describes the further diazotation of the inter-
mediate bodies from one molecule of a tetrazo compound and one molecule gamma-
amidonaphtolsulpho acid and the combination with phenoles or amines. The
dye-stuffs of the present application belonging to this group have the composition:
R-y-amidonaphtolsulpho acid-(a)-R
in which (a) and R have the same meaning as above.
A few especially valuable methods of application are described in the following
examples;
Example I-20 kilos. diamidodiphenylamine are transformed into tetrazo
diphenylamine. The tetrazo compound is in the known manner combined in
alkaline solution with 24 kilos. gamma-amido-naphtolsulpho acid. The thus
formed intermediate body separates as a black insoluble precipitate which is then
diluted with some muriatic acid, and 7 kilos. nitrite of soda are added. A tetrazo
compound results of the following constitution :
UH
-N=N-CH.
»EN=N- CH – NH – C H - N=N,
-

page_text: acid and immediately afterwards a solution of 12 kilos. m. phenylenediamine is
added. The dye-stuff separates. It.dyes unmordanted cotton black.
Example II.-15 kilos. acetparaphenylenediamine are diazotised and combined
in alkaline solution with 24 kilos. gamma-amido-naphtolsulpho acid. From the
thus formed azo body the acetyl group is removed in the known manner and then
the diamido-azo body tetrazotised. The tetrazo compound has the constitution :
паспартоигрио аст
the above complex of atoms marked (6).
It can easily be combined with phenoles or amines. If for instance it is
introduced into an alkaline solution of 24 kilos. metaphenylenediamine, a, black
dye-stuff forms immediately which separates completely. It dyes unmordanted
cotton a deep black.
If in these examples the diamidodiphenylamine or the para-phenylenediamine is
replaced by benzidine, tolidine, ethoxybenzidine, diamido-diphenolether or the
meta-phenylenediamine replaced by metatoluylenediamine likewise black coloring
matters are obtained which like the above described ones resemble in general the
analogous combinations formerly obtained from the more simple tetrazo bodies,
only their intensity is increased in consequence of the conglomeration of the azo
groups. All these dye-stuffs dye unmordanted cotton a direct black; they differ
very little from each other and the dyeings are generally very fast to washing.
Dated this. 15th day of May 1894.
The Production of Polyazo-dyestuffs. from Gamma-amidonaphtol-
sulpho Acid.
I, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman, (a communi-
cation to me from abroad by Leopold Cassella & Co., of 19 Liebigstrasse,
Frankfort-on-Main, in the Empire, of Germany,) 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 the British Patent No. 19330° a group of new tetrazo compounds has been
described which are derived from gamma-amidonaphtol sulpho acid of the general
constitution:

page_text: y-amidonaphtolsulpho acid the above complex of atoms marked (b).
It can easily be combined with phenoles or amines. If for instance it is introduced
into an alkaline solution of 24 kilos. metaphenylenediamine, a black dye-stuff forms
immediately which separates completely. It dyes uumordanted cotton a deep
black.
If in these examples the diamidodiphenylamine or the para-phenylenediamine is
replaced by other para-diamines such as benzidine, tolidine, ethoxybenzidine,
diamido-diphenolether or if the meta-phenylenediamine is replaced by other
amines or by phenols such as metatoluylenediamine resorcine, meta-amido phenole

page_text: likewise black coloring matters are obtained which like the above described ones
resemble in general the analogous combinations formerly obtained from the more
simple tetrazo bodies, only their intensity is increased in consequence of the
conglomeration of the azo groups. All these dye-stuffs dye unmordanted cotton a
direct black, they differ very little from each other and the dyeings are generally
very fast to washing.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. Producing polyazo dyestuffs by combining the tetrazo derivatives of those
compounds which are obtained from one molecule of gamma-amidonaphtolsulpho
acid and one molecule of a para-diamine with one molecule of gamma-amido-
naphtolsulpho acid and one molecule of an amine or a phenole substantially as
described.
2. Producing polyazo dyestuffs by combining the tetrazo derivatives of those
compounds which are obtained from one molecule of gamma-amidonaphtolsulpho
acid and one molecule of a para-diamine with an additional molecule of gamma-
amidonaphtolsulpho acid, rediazotising the intermediate compounds and finally
combining with amines or phenols substantially as described.
3. As new products of manufacture the dyestuffs herein described.
· Dated this 2nd day of February 1805
SYDNEY PITT.