Process for Producing Insoluble Azo Colours on Fibre.
Year: 1893

page_text: Date of Application, 6th Nov., 1893
Complete Specification Left, 7th Aug., 1894-Accepted, 8th Sept., 1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE FARBWERKE vormals MEISTER LUCIUS
AND BRUNING, of Hoechst a/Main, in the Empire of Germany, Manu-
facturers.]
Process for Producing Insoluble Azo Colours on Fibre.
I, OLIVER IMRAY, 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:-
It is well known that both in printing and dyeing, insoluble azo colours have
during several years been developed on cotton fibre on a large scale, and that
almost exclusively in the form of beta naphthol compounds.
During this time many experiments have been made to produce, on the beta
naphthol prepared fibre, besides red and claret a pretty and fast blue in the form
of an azo colour, but none of these efforts have succeeded.
All that could be attained was to develope a blue of little beauty or fastness, by
employing for the ground another component beta-oxy-naphthoic acid (melting
point 216° C.) and as second component dianisidine.
But the colour thus obtained has to be treated with sulphate of copper in order
to give it some degree of fastness in washing and moreover this method of grounding
has the disadvantage, that, except blue, no other colour, such as red or claret, can
be produced upon it. It is therefore impossible to produce in this manner a many
coloured fabric. Another objection to the practical introduction of this process is
the high price of the oxynaphthoic acid.
My foreign correspondents have now discovered that a beautiful blue can be
obtained by adding cupric chloride to the diazo solution of the dianisidine, whereas
by employing the copper salt only a red violet is obtained.
A similar effect, marked principally by greater fastness, is obtained when cupric
chloride is added to the diazo compounds of other bases, which have been used for
producing azo colours on the fibre.
The goods are
The process for the production of the colour is the usual one.
padded with beta-naphthol sodium or another phenol suitable for coupling with or
without addition of Turkey red oil, the goods are dried and then printed with the
thickened diazo solution with addition of cupric chloride or are passed through the
chloride in unthickened state.

page_text: 15
gr.
"
50
"
35
"
of diazo solution.
cupric chloride 40° Bé.
gum water.
water.
•
.
"
COMPLETE SPECIFICATION.
Process for Producing Insoluble Azo Colours on Fibre.
I, OLIVER IMRAY, 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 :-
It is well known that both in printing and dyeing, insoluble azo colours have
during several years been developed on cotton fibre on a large scale, and that
almost exclusively in the form of beta naphthol compounds.
During this time many experiments have been made to produce, on the beta
naphthol prepared fibre, besides red and claret a pretty and fast blue in the form
of an azo colour, but none of these efforts have succeeded.
All that could be attained was to develop a blue of little beauty or fastness, by
employing for the ground another component beta oxy-naphthoic acid (melting
point 216° C.) and as second component dianisidine.
But the colour thus obtained has to be treated with sulphate of copper in order
to give it some degree of fastness in washing and moreover this method of grounding
has the disadvantage that, except blue, no other colour such as red or claret, can
be produced upon it. It is therefore impossible to produce in this manner a many
coloured fabric. Another objection to the practical introduction of this process is
the high price of the oxynaphthoic acid.
My foreign correspondents have now discovered that a beautiful blue can be
obtained by adding cupric chloride to the diazo solution of the dianisidine, whereas
by employing the copper salt only a red violet is obtained.
A similar effect, marked principally by greater fastness, is obtained when cupric
chloride is added to the diazo compounds of other bases, which have been used for
producing azo colours on the fibre.
The goods are
The process for the production of the colour is the usual one.
padded with beta-naphthol sodium or another phenol suitable for coupling with or
without addition of Turkey red oil, the goods are dried and then printed with the
thickened diazo solution with addition of cupric chloride or are passed through the
chloride in unthickened state.
EXAMPLE.

page_text: 15
gr.
of diazo solution.
6
"
cupric chloride 40° Bé.
50
"
gum water.
35
"
water.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The production of fast insoluble azo-colours on fibre by submitting phenols,.
with the sodium salts of which the cotton to be dyed or printed has been
impregnated to the action of mixtures of diazo compounds of aromatic bases and of
cupric chloride.
2. Cotton fibre having fast insoluble azo-colours developed in or upon it by the
action of mixtures of diazo compounds of aromatic bases and of cupric chloride
upon phenols, with the sodium salts of which the cotton goods to be dyed or printed
have been impregnated, substantially as described.
Dated this 7th day of August 1894.
ABEL & IMRAY,
Agents for the Applicant.