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

page_text: PROVISIONAL SPECIFICATION left by Joseph Anthony Dixon at the Office
of the Commissioners of Patents on the 21st April 1882. A communication
from abroad by Carl Rumpff of Aprath near Elberfeld in the Empire of
Germany Chemical Manufacturer.
JOSEPH ANTHONY DIXON of 151 St Vincent Street Glasgow in the County of
Lanark North Britain Solicitor IMPROVEMENTS IN THE MANUFACTURE OF
COLOURING MATTERS SUITABLE FOR DYEING AND PRINTING [A communication
from abroad by Carl Rumpff of Apratlı near Elberfeld in the Empire of Germany
Chemical Manufacturer.]
The nature of this Invention consists in manufacturing colouring matters
suitable for dyeing and printing by the reaction of the Sulpho Acids of Diazo and
Diazo azo or Tetrazo derivatives of the aromatic hydrocarbons preferably in the
form of the Sodium Salts or Compounds of the said Sulpho Acids on Napthylamine
Alpha or Beta in acid solution or any of the Sulpho acids of Napthylamine Alpha
or Beta in acid Solution.-Instead of fixing the Sulpho Molecule on the Diazo or
Diazo azo body or the Napthylamine before making them react on each other in
acid solution as aforesaid, either or both may be used in the non-sulphonated
state and the compound resulting from their reaction may be sulphonated after-
wards. By Diazo and Diazo azo or Tetrazo derivatives of the aromatic Hydro-
carbons, I mean the derivatives obtained by acting with nitrous acid (or a nitrite
and an acid to liberate from the nitrite its nitrous acid) on the amido and amido
azo bases corresponding to the Aromatic Hydrocarbons.-As examples and
illustrations of the reactions in which my Invention consists and of the process by
which the same are effected I give the following cases:―
I prepare a Now Brown dyestuff, or dyestuffs, or colouring matter, or matters,
by causing Diazo Napthalene Sulphonate of Soda to act on Napthylamine Alpha
or Beta in acid solution and this I do by dissolving 50 lbs of Alpha or Beta
Napthylamine Sulphonate of Soda in 500 lbs of water, cooling the solution down
to 3° Centegrade by ice, adding slowly to the cooled solution 75 lbs of Muriatic
Acid and then 11 lbs of Sodium Nitrito dissolved in 40 lbs of water, and then after
several hours rest (by which time the Napthylamine Sulphonate has been con-
verted into the corresponding Diazo Napthalene Sulphonate) I pour the liquid into
a solution containing 25 lbs of Napthylamine Alpha or Beta, 50 lbs of Muriatic

page_text: Acid, and 500 lbs of water.-On the union of the liquids the new Brown dyestuff
separates instantly as a voluminous precipitate which is filtered and dried.-This
dyestuff, when dry, appears as a Brown Powder which is soluble in hot water, and
crystallizes on cooling.-The aqueous solution becomes yellowish on addition of
alkalis; It becomes Blueish Red on addition of concentrated mineral acids and
the dyestuff partially separates. The dyestuff dyes silk and wool in an acidulated
bath and is fast against soap and light.
Again, for the above mentioned Alpha or Beta Napthylamine Sulphonate of
Soda, I substitute in the above process the Amido Azo Benzol Sulphonate of Soda
and conduct the process in all other particulars as above described and so I obtain
another Brown dyestuff which behaves towards acids and Alkalis very similarly to
the dyestuff already described, dyes wool and silk a dark reddish Brown colour in
an acidulated bath and is fast against soap and light.
Other colouring matters may be got by substituting in the preceding process the
Sulpho Acids of the Diazo and the Diazo azo or Tetrazo derivatives of Toluol,
Xylol, Methyl, Benzol, Ethyl Benzol, and of the other aromatic hydrocarbons
(including Naphalene) in the form preferably of the Sodium Salts of said Sulpho
Acids, for Diazo Napthalene Sulphonate of Soda, or for the Diazo derivative of
Amido azo Benzol Sulphonate of Soda, the-reaction-between the Diazotized body
and the Napthylamine or its Sulpho acid being always conducted in an acid-
solution.