Manufacture of New Colouring Matters.
Year: 1892

page_text: Date of Application, 16th Sept, 1892
Complete Specification Left, 10th May, 1893-Accepted, 10th June, 1898
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE ACTIEN GESELLSCHAFT FÜR ANILIN
FABRIKATION, of Berlin, in the Empire of Germany, Chemical Manu-
facturers.]
Manufacture of New Colouring Matters.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery Lane,
In the County of London, Chartered Patent Agent, do hereby declare the nature
of this invention to be as follows:-
The invention relates to the production of new and valuable azo colouring
matters, containing as component the 1:8 amidonaphtholmonosulpho-acid, which
may be prepared by melting with alkali the a naphthylamine-disulpho-acid mentioned
in the German Patent No. 40571.
The amidonaphthol monosulpho acids at present known yield, when combined with
the tetrazo-derivatives of para diamines, either bluish black colouring matters or
bluish violet to red violet products of no practical value.
My foreign correspondents have now discovered that, on the contrary, by the
combination of the aforesaid 1:8 amidonaphtholmonosulpho acid with the tetrazo
derivatives of tolidine and dianisidine, colouring matters of high technical value are
produced, which dye unmordanted cotton in an alkaline or salt bath pure blue
shades, and which are moreover in purity and greenish tint superior to the corre-
sponding combination products obtained with a naphtholsulpho acids and even with
dihydroxynaphthalene-sulpho acid d.
In order to prepare these new colouring matters, one molecule of tolidine or
dianisidine is converted in the well known manner into the tetrazo compound, which
is then combined with two molecules of the 1:8 amidonaphtholmonosulphonic in an
alkaline solution.
The colouring matter, obtained in this way from dianisidine, dyes unmordanted
cotton slightly more greenish blue than the corresponding tolidine derivative.
My foreign correspondents have further discovered, that one molecule of
the 1:8 amidonaphtholmonosulpho acid forms with one molecule of tetrazo-ditoly!
or tetrazo dianisol an intermediate product which contains one free diazo group and
can therefore be afterwards combined with one molecule of an amine, diamine,
phenol, amido-phenol, or the sulpho- and carbo- acids of these bodies.
The preparation of these mixed azo colours is generally carried out in the
following way.
One molecule of the tetrazo compound of tolidine or dianisidine is combined in
an alkaline solution with one molecule of 1:8 amidonaphtholmonosulpho acid; the
intermediate product, which is a bluish black insoluble precipitate, is caused to
react upon one molecule of the aforesaid substances; according to the compounds
employed, the shade of the resulting mixed azo colour varies from greenish blue to
greyish violet and bluish black.
Dated this 19th of Qantambor 1900
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Manufacture of New Colouring Matters.
1, CHARLES DENTON ABEL of No. 28 Southampton Buildings, Chancery Lane,
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 new and valuable azo colouring
matters, containing as component the 1:8 amidonaphtholmonosulpho acid, which
may be prepared by melting with alkali the a naphthylamine-disulpho-acid mentioned
in the German Patent No. 40571.
The amidonaphthol monosulpho acids at present known yield, when combined
with the tetrazo derivatives of para diamines, either bluish black colouring matters
or bluish violet to red violet products of no practical value.
My foreign correspondents have now discovered that, on the contrary, by the
combination of the aforesaid 1:8 amidonaphtholmonosulpho acid with the tetrazo
derivatives of tolidine and dianisidine, colouring matters of high technical value
are produced, which dye unmordanted cotton in an alkaline or salt bath pure blue
shades, and which are moreover in purity and greenish tint superior to the corre-
sponding combination products obtained with a naphthol-sulpho acids and even
with dihydroxynaphthalenesulpho acid 8.
The following example shows the manner of carrying out this invention:
21-2 kilos. tolidine are couverted into the tetrazo compound, and the solution of
this is poured into a solution of 52.2 kilos. 1:8 amidonaphtholmonosulphonate of
sodium kept alkaline by addition of carbonate of soda. A black blue precipitate
is immediately formed; after standing for some time the mixture is slightly heated,
and the colouring matter is salted out, filtered, pressed and dried.
It dyes
unmordanted cotton in an alkaline or neutral bath containing common salt or
Glauber's salts a pure blue; it may also be fixed on wool in a dye bath containing
some salt.
The colouring matter obtained in an analogous manner from dianisidine gives a
blue of a more greenish shade.
My foreign correspondents have further discovered that one molecule of the
1:8 amidonaphtholmonosulpho acid forms with one molecule of tetrazo-ditolyl or
tetrazodianisol an intermediate product which contains one free diazo group and
can therefore be afterwards combined with one molecule of an amine, diamine,
phenol, amidophenol or the sulpho- and carbo- acids of these bodies.
The preparation of these mixed azo colours is generally carried out in the
following way.
One molecule of the tetrazo compound of tolidine or dianisidine is combined in
an alkaline solution with one molecule of 1:8 amidonaphtholmonosulpho acid; the
intermediate product, which is a bluish black insoluble precipitate, is caused to
react upon one molecule of the aforesaid substances; according to the compounds
employed, the shade of the resulting mixed azo colour varies from greenish blue to
greyish violet and bluish black.
For instance, by combining the intermediate product resulting from 24.4 kilos.
dianisidine and 26.1 kilos. amidonaphtholmonosulphonate of sodium with 24°4 kilos.
naphthol monosulphonate of sodium, a dyestuff is obtained which dyes
unmordanted cotton pure blue.
a
a
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 manufacture of colouring matters by
combining one molecule of tetreze ditolul tator h
molecules of

page_text: the 1:8 amidonaphtholsulphonic acid which may be prepared by melting with
alkalies the a naphthylaminedisulpho acid mentioned in the German Patent
No. 40571.
2-The herein described process for the manufacture of mixed azo colouring
matters by combining one molecule of tetrazoditolyl, tetrazodianisol with one
molecule of the 1:8 amidonaphtholsulpho acid to form an intermediate product and
reacting therewith upon one molecule of an amine, diamine, phenol, amidophenol or
their sulpho- or carbo- acids.
3-The colouring matters produced by the process referred to in Claim 1.
4-The mixed azo colouring matters "produced by the process referred to in
Claim 2.
ABEL & IMRAY,
Agents for the Applicant.