Year: 1898

page_text: Date of Applleation, 6th Oct., 1898
Complete Specification Left, 30th June, 1899-Accepted, 12th Aug., 1899
A mixture prepared from 100 parts of paratoluidine, 10 parts of stannous chloride,
8 parts of boric acid, and 10 parts of the potassium salt of alpha amido hydroxy
anthraquinone sulphonic acid, is heated by means of a water bath. After a short
time, the original yellow colour of the mixture turns to a dark green, and the reaction
is finished, when a change in colour is no longer distinguishable. At this stage, the
mixture is allowed to cool to 50 degrees Centigrade, and is subsequently poured into
dilute hydrochloric acid. In this manner, a greenish blue precipitate is obtained,
which represents the paratoluidine salt of the colouring matter. This salt is insoluble
even in hot water. When heated with dilute caustic soda-lye, it is transformed into
the sodium salt of the dye-stuff, which yields, on wool, with or without the aid of
mordants very fast green shades.
Analogous colouring matters are obtained if the alpha amido hydroxy anthra-
quinone sulphonic acid is condensed with other aromatic amido compounds."
On using the amidohydroxy-anthraquinone sulphonic acid which is obtainable from
beta nitro anthraquinone sulphonic acid, dyestuffs result which are identical with
those producible from the amidohydroxyanthraquinone sulphonic acid which can be
obtained from alpha-nitro-anthroquinone sulphonic acid.
My foreign correspondents wish it to be understood that they do not limit them-
selves to the particulars given in the above example, which is merely typical, as the
present invention, in general, relates to the production of green anthraquinone
D
077

page_text: dyestuff, by condensing, with aromatic amido compounds, amido hydroxy
anthraquinone sulphonic acids obtainable from nitro anthraquinone sulphonic
acids.
A mixture prepared from 100 parts of paratoluidine, 10 parts of stannous chloride,
8 parts of boric acid, and 10 parts of the potassium salt of alpha amidohydroxyanthra-
quinone sulphonic acid, is heated by means of a water-bath. After a short time, the
original yellow colour of the mixture turns to a dark green, and the reaction is
finished when a change in colour is no longer distinguishable. At this stage, the
mixture is allowed to cool to 50 degrees Centigrade, and is subsequently poured into
dilute hydrochloric acid. In this manner a greenish-blue precipitate is obtained,
which represents the paratoluidine salt of the colouring matter. This salt is insoluble,
even in hot water. When heated with dilute caustic soda-lye, it is transformed into
the sodium salt of the dye-stuff, which yields on wool, with or without the aid of
mordants, very fast green shades.
Analogous coloring-matters are obtained if the alpha amidohydroxyanthraquinone
sulphonic acid is condensed with other aromatic amido compounds.
On using the amidohydroxyanthraquinone sulphonic acid which is obtainable
from beta nitroanthraquinone sulphonic acid, dyestuffs result which are identical with
those produced from the amidohydroxyanthraquinone sulphonic acid which can be
obtained from alpha nitroanthraquinone sulphonic acid.
My foreign correspondents wish it to be understood that they do not limit
themselves to the particulars given in the above example, which is merely typical
as the present invention in general relates to the production of green anthraquinone
dye-stuffs by condensing with aromatic amido compounds the amidohydroxyanthra-
quinone sulphonic acids obtainable from the above defined nitroanthraquinone
sulphonic acids.

page_text: 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
from abroad), I declare that what I claim is:―
The process for producing green anthraquinone dye-stuffs, which process consists
in condensing with aromatic amido compounds, those alpha, alpha, amidohydroxy-
anthraquinone sulphonic acids which can be obtained, for instance, by treating with
sulphur sesquioxide the nitroanthraquinone sulphonic acids (described in the
"Berichte der Deutschen Chemischen Gesellschaft," Vol. 15, page 1514),
substantially as herein before described.