An Improved Process for Producing Azo Colouring Matters.
Year: 1891

page_text: Date of Application, 23rd Feb., 1891
Complete Specification Left, 1st May, 1891-Accepted, 23rd Feb., 1892
PROVISIONAL SPECIFICATION.
An Improved Process for Producing Azo Colouring Matters.
I, ALFRED FISCHESSER, of Lutterbach, Alsace, in the Empire of Germany,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
My invention relates to a process for producing azo colouring matters.
By substituting in the well-known process for the direct production of insoluble
azo colouring matters upon the fibre, either by printing or by dyeing, one of the
components, which is usually a or ẞ naphthol, by ẞ oxynaphtholic acid the melting
point of which is 216 degrees, very valuable new tints are obtained..
For instance by preparing a fabric in an alkaline solution of ẞ oxynaphtholic.
acid (melting point 216 degrees) and printing upon the same a concentrated
solution of tetrazodized dianisidine a blue is obtained which greatly resembles
indigo and resists washing and soap. In lieu of dianisidine the following amido
substances can be employed, that is to say, aniline, toluidine, xyloidine, cumidine,
amidoazoxylol, amidoazobenzol, amidoazotoluol, the various nitroanilines and
nitrotoluidines, a or ẞ naphthylamines, benzidine, toluidine, diamidophenolether,
amidonaphthols, acetparaphenylenediamine, thioparatoluidine, or mixtures of the
same.
It is evident that instead of the above-mentioned amines others can be used, they
are however rarer, otherwise they produce the same effect as those named.
The tints obtained differ from those which the respective amines give with a or ẞ
naphthol.
Thus, for instance, ẞ naphthylamine gives a bordeaux, aniline a yellowish red,
nitroaniline a fiery red, toluidine a deep violet.
The colours can also be produced by dyeing upon yarn and piece-ware.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Process for Producing Azo Colouring Matters.
I, ALFRED FISCHESSER, of Lutterbach, Alsace, in the Empire of Germany,
Manufacturer 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 :-
My invention relates to a process for producing azo colouring matters.
By substituting in the well-known process for the direct production of insoluble
azo-colouring matters upon the fibre, either by printing or by dyeing, one of the
components, which is usually a- or ẞ-naphthol, by B-oxynaphthoic acid the melting
point of which is 216 degrees, very valuable new tints can be produced. For
instance by preparing a fabric in an alkaline solution of ẞ oxynaphthoic acid
(melting point 216 degrees) and printing upon the same a thickened solution of
tetrazodized dianisidine a blue is obtained which resembles indigo and resists
washing and soap. Instead of dianisidine the following amido-substances can be
employed viz.aniline toluidine, xylidine, cumidine, amido-azoxylol, amido-azo-
benzol, amidoazotoluol, the various nitroanilines and nitrotoluidines a ог
ẞ naphthylamines, benzidine, tolidine, diamidodiphenol ether, amidonaphthols,
acet paraphenylene-diamine, thioparatoluidine or mixtures of the same. Magenta
can be employed as an amine and will also give good results.

page_text: It is evident, that instead of the above-mentioned amines others can be used, they
are however scarcer, but they produce the same effects as those above named."
The tints obtained differ from those which the respective amines give with « or
ẞ naphthol. Thus for instance, 3 naphthylamine gives a bordeaux aniline a
yellowish red, nitroaniline a fiery red, tolidine a deep violet.
The colours can also be produced by dyeing upon yarn and piece-ware.
The textile fibre whether cotton, wool, silk, or jute are impregnated with the
solution of the diazo-compound or tetrazo-compound and the ẞ oxynaphthoic acid
(melting point 216° C.) in an alkaline solution or vice versa.
It is also advantageous to oil the fibre first, as in turkey-red dyeing, insoluble
metallic soaps may also be precipitated on it.
The most valuable shades produced by dyeing are greenish blue with
dianisidine, reddish blue with tolidine and dark velvet (mauvine) with benzidine.
A passage through weak acid after dyeing is useful in order to develop the colour
well.
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 :-
The employment of ẞ oxynaphthoic acid having a melting point of 216 degrees
for producing azo colours which are insoluble in water, directly upon textile fibres
either by dyeing or by printing.
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HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.