Improvements in the Production of Azo Colouring Matters.
Year: 1892

page_text: Date of Application, 2nd Sept., 1892
Complete Specification Left, 31st May, 1893-Accepted, 15th July, 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE ACTIEN GESELLSCHAFT FÜR ANILIN
FABRIKATION, of Berlin, Germany, Chemical Manufacturers.]
Improvements in the Production of Azo Colouring Matters.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, in the County
of London, Chartered Patent Agent, do hereby declare the nature of this inven-
tion to be as follows:-
The invention relates to the production of mixed azo colouring matters, derived
from para-diamines in combination with y amidonaphthol-mono-sulphonic acid and
certain naphthol carbonic acids.
(
My foreign correspondents have discovered that by combining tetrazodiphenyl
or its homologues with one molecule of y amidonaphthol mono-sulphonic acid, and
reacting afterwards with the intermediate product thus formed upon ẞ hydroxy-
naphthoic acid, (melting at 216° C.,) or hydroxynaphthoic acid, valuable
colouring matters may be formed, which possess the property of dyeing unmordanted
cotton in an alkaline or salt bath from indigo blue to brown violet. These new
colouring matters are further distinguished by their great intensity and fastness
against light, air and washing.
The preparation of these, colouring matters is generally carried out in the
following manner.
One molecule of dianisidine is converted in the well known manner into
tetrazo-dianisol salt; the solution of the latter is poured into a solution of one
molecule of y amidonaphthol monosulphonic acid, which is kept alkaline by means
of carbonate of soda; the intermediate product, which is a black insoluble
precipitate, is afterwards combined with one molecule of ẞ hydroxynaphthoic acid,
(melting at 216° C.,) in a solution rendered alkaline by the addition of caustic
soda lye.
The mixture is well stirred for some time; after heating it the colouring matter
is salted out, filtered, pressed and dried. It dyes unmordanted cotton a deep
indigo blue shade.
If, for the dianiside, tolidine or benzidine, is substituted, similar colouring matters
are obtained which yield shades slightly more violet blue.
By employing instead of the 3 hydroxynaphthoic acid, the isomeric a hydroxy-
naphthoic acid, violet brown colouring matters are produced.
Dated this 2nd day of September 1892.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Production of Azo Colouring Matters.
I, CHARLES DENTON ABEL of No. 28 Southampton Buildings, in the County
of London, Chartered 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 :-
This invention relates to the production of mixed azo colouring matters derived
from para-diamines in combination with y amido-naphthol-mono-sulphonic acid and
certain naphthol carbonic acids.
My foreign correspondents have discovered that by combining tetrazodiphenyl

page_text: a
or its homologues with one molecule of y amido-naphthol-mono sulphonic acid and
reacting afterwards with the intermediate product thus formed upon ẞ hydroxy-
naphthoïc acid (melting at 216° C.) or hydroxynaphthoic acid, valuable
colouring matters may be formed, which possess the property of dyeing unmordanted
cotton in an alkaline or salt bath from indigo blue to brown violet. These new
colouring matters are further distinguished by their great intensity and fastness
against light, air and washing.
The following example will show the manner in which the preparation of these
colouring matters may he practically carried out. 24.4 kilos. of dianisidine are
converted in the well known manner into tetrazodianisol salt, the solution of the
latter is poured into a solution of 26 kilos. of y-amidonaphtholmono-sulpho acid,
which is kept alkaline by carbonate of soda, the intermediate product, which is a
black insoluble precipitate, is afterwards combined with 19 kilos. of B-hydroxy-
naphthoic acid (having a melting point of 216° C.) in a solution rendered alkaline
by the addition of caustic soda lyc. The mixture is well stirred for some time;
after heating it the colouring matter is salted out, filtered, pressed and dried. It
dyes unmordanted cotton a deep indigo blue. The colouring matter prepared in
an analogous manner from diphenitidine possesses a similar shade.
If for the dianisidine, tolidine or benzidine is substituted, similar colouring
matters are obtained which yield shades slightly more violet blue.
By employing, instead of the ẞ-hydroxynaphthoïc acid, the isomeric a-hydroxy-
naphthoic acid, violet brown colouring matters are produced.
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. The herein described process for the production of azo-colouring matters by
combining one molecule of the tetrazo compounds obtained from benzidine, tolidine
or diamido-diphenol-ether with one molecule of y-amidonaphthol-mono-sulpho acid
to form an intermediate product, and reacting with this product upon one molecule
of B-hydroxynaphthoïc acid (having a melting point of 216° C.) or a-hydroxy-
naphthoïc acid.
2. The colouring matters manufactured as set forth in the preceding claim.
Dated this 27th day of Mar 1893
ABEL & IMRAY,
Agents for the Applicant.