IMPROVEMENTS IN COLOURING MATTERS SUITABLE FOR DYEING AND PRINTING
Year: 1882

page_text: LETTERS PATENT to John Erskine of 151 St. Vincent Street Glasgow in the
County of Lanark North Britain Solicitor for an invention of IMPROVEMENTS
IN COLOURING MATTERS SUITABLE FOR DYEING AND PRINTING a communi-
cation from abroad by Dr. Carl Koenig of Höechst-am-Main in the Empire of
Germany, a Director of the Farbwerke vorm: Meister Lucius and Brüning a
PROVISIONAL SPECIFICATION left by the said John Erskine at the
Office of the Commissioners of Patents on the 30th May 1882.
JOHN ERSKINE, of 151 St. Vincent Street, Glasgow, in the County of Lanark,
North Britain, Solicitor. "IMPROVEMENTS IN COLOURING MATTERS SUITABLE FOR
DYEING AND PRINTING," [A communication from abroad by Dr. Carl Koenig
of Höechst-am-Main in the Empire of Germany, a Director of the Farbwerke
vorm Meister Lucius and Brüning a company carrying on business as Chemical
Manufacturers].
The Invention as communicated to me consists in the production of azo
colouring matters from the Trisulphonic acids of Alpha-and Beta-Napthol.
The process for the production of new colouring matters being partly founded on
the discovery of the Trisulphonic Acid of Beta-Napthol, I first give the description
of the method of producing this sulphonic acid.
I wish it to be understood that besides the Beta-Napthol itself, its mono-and
Bi-sulphonic acids can serve as starting points in the production of the Trisulphonic
acid of Beta-Napthol.
In order to convert the Beta-Napthol, for example, into the Trisulphonic acid I
add one part of Napthol, to from four to five parts of fuming sulphuric acid
(containing 20% of SO) in such a manner that the temperature of the mixture
rises up to 284-320° Fahrenheit (140°-160° Centigrado).
°
The action is allowed to proceed at this temperature until a sample of the
product gives with ammonia a solution showing a pure green fluorescence and
produces a colouring matter on being left standing with Diazo-Xylol in an alkaline

page_text: solution. This point having been attained the mass is in the usual manner converted
into the sodium salt of the Trisulphonic acid of Beta-Napthol.
In the place of the fuming sulphuric acid all the sulphonizing agents known at
present may be used.
Out of the number of Diazo compounds that the communication of this
Invention has combined in the way generally employed with the new Trisulphonic
acid of Napthol for the purpose of producing azo colouring matters ranging in tint
from yellow through scarlet to purple, I mention the following viz: the Diazo-
Benzol, the sulphonic acid of Diazo-Benzol, the Diazo-Chloro-Xylol, the Diazo-
Chloranisol, the Diazo-Nitro-Benzol, the Diazo-Napthaline sulphonic acid, the
Diazo-Azo-Benzol, the Diazo-Azo-Benzol sulphonic acid, the Diazo-Methyl-azo-
Benzol, (CH, CH, N=NC. H, NN Cl) the Diazo-Benzoic acid and the Methyl-ether
of Diazocinnamic acid, without however meaning to keep the number of colouring
matters that may be obtained in the aforesaid, or in an analogous manner, within
that of the examples before mentioned.
The Trisulphonic acid of Alpha-Napthol described in the Specification of Letters
Patent granted to John Henry Johnson No 5305 A.D. 1879 behaves like the
Trisulphonic acid of Beta-Napthol, that is to say, this acid also yields, on com-
bination with Diazo-compounds, new azo-colouring matters.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Erskine in the Great Seal Patent Office on the 10th November
1882.
"
JOHN ERSKINE, of 151 St. Vincent Street, Glasgow, in the County of Lanark,
North Britain, Solicitor "IMPROVEMENTS IN COLOURING MATTERS SUITABLE FOR
DYEING AND PRINTING a communication from abroad by Dr Carl Koenig
of Hoechst-am-Main in the Empire of Germany, a Director of the Farbwerke
vorm: Meister, Lucius and Bruning, a Company carrying on business as Chemical
Manufacturers
The Invention as communicated to me consists in the production of azo
colouring matters from the Trisulphonic acids of Alpha and Beta Napthol.
.
The process for the production of new colouring matters being partly founded
on the discovery of the Trisulphonic Acid of Beta Napthol, the description of the
method of producing this sulphonic acid is first given.
It is to be understood that besides the Beta Napthol itself, its mono and
bi-sulphonic acids can serve as starting points in the production of the Trisulphonic
acid of Beta Napthol.
In order to convert the Beta Napthol, for example, into the trisulphonic acid one
part of Napthol, is added to from four to five parts of fuming Sulphuric Acid
(containing 20% of SO3) in such a manner that the temperature of the mixture
rises up to 284°-320° Fahrenheit (140°-160° Centigrade).
The action is allowed to proceed at this temperature until a sample of the
product gives with ammonia a solution shewing a pure green fluorescence and
produces a colouring matter on being left standing with Diazo-Xylol in an alkaline
solution. This point having been attained the mass is in the usual manner
converted into the sodium salt of the Trisulphonic Acid of Beta Napthol.
In the place of the fuming sulphuric acid all the Sulphonizing Agents known at
present may be used.
Out of the number of Diazo compounds that the communicator of this Invention
has combined in the way generally employed with the new Trisulphonic acid of
Napthol for the purpose of producing azo colouring matters ranging in tint from
yellow through scarlet to purple, the following may be mentioned namely, the
Diazo Benzol, the Sulphonic Acid of Diazo Benzol, the Diazo Chloro Xylol, the
Diazo Chloranisol, the Diazo-Nitro-Benzol, the Diazo-Napthalene Sulphonic acid,
the Diazo-Azo Benzol, the Diazo-azo-Benzol Sulphonic Acid, the Diazo-methyl-azo
Benzol, (CH, C, H, N=NC. H, NN CI) the Diazo-Benzoic acid and the Methyl-ether
of Diazo-cinnamic acid, without however meaning to keep the number of colouring
matters that may be obtained in the aforesaid or in an analogous manner within that
of the examples before mentioned.
The Trisulphonic acid of Alpha Napthol described in the Specification of Letters
Patent granted to John Henry Johnson No. 5305 A.D. 1879 behaves like the
trisulphonic acid of Beta Napthol, that is to say, this acid also yields on com-
bination wiih diazo compounds, new azo colouring matters.
Having now described and particularly ascertained the nature of the said
Invention and the system, mode or manner in or under which the same is or
may be used or practically carried into effect, it is to be observed in conclusion
that what is considered to be novel and original and therefore claimed as the
Invention secured to the Inventor by the hereinbefore in part recited Letters
Patent is.
First. The production of the trisulphonic acid of Beta Napthol by sulphoniza
tion of beta napthol and of its mono and di-sulphonic acids as hereinbefore
described or in manner substantially the same.

page_text: Second-The production of Azo colouring matters by combining the trisulphonic
acids of alpha and of beta napthol with aromatic diazo compounds as hereinbefore
described or in manner substantially the same.
In witness whereof I the said John Erskine have hereunto set my hand
and seal this Third day of November in the year of our Lord One thousand
eight hundred and eighty two.