Method for the Production on the Fibre of Azo-colours insoluble in Water, in Tints Varying from Violet-Black to Dark Black Tints.
Year: 1898

page_text: Date of Application, 8th Aug., 1898
Complete Specification Left, 8th May, 1899-Accepted, 1st July, 1899
Method for the Production on the Fibre of Azo-colours insoluble in
Water, in Tints Varying from Violet-Black to Dark Black Tints.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, Chancery
Lane, in the County of London, Chartered Patent Agent, do hereby declare the nature
of this invention (as communicated to me from abroad by The Farbwerke vormals:
Meister Lucius and Brüning, of Hoechst a/Main, in the Empire of Germany, Chemical
Manufacturers), to be as follows:-
Since the introduction in cotton printing of insoluble naphtholazo colours produced
on the fibre, the want has made itself felt of being able to combine these colours with a
fast black easily applied, a want which hitherto has only been imperfectly satisfied.
Since, as is known, the alkaline naphthol preparation of the tissue to be printed did
not permit the production of a good and reliably acting aniline black, a sable black
obtained from logwood extract was at first employed, which adhered to the tissue only
in a very imperfect manner, as in consideration of the corresponding azo colours, a
prolonged steaming such as is requisite for the complete fixing, had to be omitted.
It was therefore endeavoured to produce the black as azo colour direct on the fibre,
and results worth of notice have been obtained in this promising direction.
Experiments to form the black as azo colour direct on the fibre have been made
hitherto according to the following methods :-
1) Production of black as a mixed colour from a dark-violet or blue with brown, red
or orange, in such a manner, that, on the tissue grounded with B-naphthol sodium,
mixtures of tetrazo or diazo compounds of dianisidin, benzidin, tolidin, p-nitranilin,
m-nitranilin or ẞ-naphthylamine etc. were printed.
2) Production of black on B-naphthol ground by applying very powerful tetrazo
compounds of certain diamidobases and diamidoazobases, for instance, p-amido-
benzeneazoalphanaphthylamine, amidochrysoidine etc.
3) Production of black from diazocompounds by means of substituted naphthols,
particularly amidonaphthols by themselves or mixed with ẞ-napthol.
For want of better methods that described under (1) is much used at present;
the black tints obtained can only claim the name of black as very concentrated
colours. Besides, this method has the drawback of inferior durability of the
printing colours and variable results caused by the application of mixtures of various
easily decomposed diazo compounds.
Method (3), on the other hand, permits only of a limited application, rendered
complicated by its very nature.
Of the bases employed according to method (2), only p-amidobenzolazoalphanaph-
thylamine has hitherto yielded a dark and pure black, and a general application of
this diamidoazo-body failed on account of the foaming of the diazo printing colour
and its decomposition when printing in hot places.
My correspondents have shewn in their English Patent Application No 30446
of 1897, that diamidocarbazols are very appropriate for producing powerful and fast
brown tints on naphthol ground and they have now succeeded in obtaining a dark

page_text: violet and violet-black by coupling the tetrazocompound of dimethylated diamido-
carbazol with ẞ-naphthol on the fibre.
The introduction of 2 methyl groups into the molecule of p-diamidocarbazol
evidently increases the tinctorial power of the ẞ-naphthol azo dyestuff and changes
the tints of the same in the direction of blue.
The diazo colour printed in a sufficiently strong concentration yields on the
usual B-naphthol ground a full violet black very fast to soap and light and the
prepared diazo printing colour is also sufficiently stable for practical use.
By a first print of resisting agents;-tin salts or sulphite colours, the black can also
be resisted in white or variegated.
.
The application of diamidodimethyl carbazol for producing black on the fibre by
way of printing is carried out in the known manner :-
ABEL & IMRAY,
Agents for the Applicants.
Method for the Production on the Fibre of Azo-colours Insoluble in
Water, in Tints Varying from Violet-black to Dark Black Tints.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, Chancery
Lane, in the County of London, Chartered Patent Agent, do hereby declare the
nature of this invention (as communicated to me from abroad by The Farbwerke
vormals Meister Lucius and Brüning, of Hoechst a/Main, in the Empire of Germany,
Chemical Manufacturers), and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
Since the introduction in cotton printing of insoluble naphtholazo-colours produced
on the fibre, the want has made itself felt of being able to combine these colours with
a fast black easily applied, a want which hitherto has only been imperfectly satisfied.
Since, as is known, the alkaline naphthol preparation of the tissue to be printed
did not permit the production of a good and reliably acting aniline black, a printing
black obtained from logwood extract was at first employed which adhered to the tissue

page_text: only in a very imperfect manner, as in consideration of the corresponding azo-colours,
prolonged steaming such as is requisite for the complete fixing, had to be
omitted.
It was therefore endeavoured to produce the black as azo-colour direct on the fibre,
and results worth of notice have been obtained in this promising direction.
Experiments to form the black as azo-colour direct on the fibre have been made
hitherto according to the following methods:-
1. Production of black as a mixed colour from a dark-violet or blue with brown, red
or orange, in such a manner that on the tissue grounded with ẞ-naphthol sodium,
mixtures of tetrazo-or diazo-compounds of dianisidine, benzidine, tolidine, p-nitrani-
line, m-nitraniline or B-naphthylamine etc. were printed.
2. Production of black on 8-naphthol ground by applying very powerful tetrazo-
compounds of certain diamido-bases and diamidoazobases, for instance, p-amido-
benzeneazoalphanaphthylamine, amidochrysoidine etc.
3. Production of black from diazo-compounds by means of substituted naphthols,
particularly amidonaphthols by themselves or mixed with 8-naphthol.
For want of better methods that described under (1) is much used at present; the
black tints obtained can only claim the name of black as very concentrated colours.
Besides, this method has the drawback of inferior durability of the printing colours
and variable results caused by the application of mixtures of various easily
decomposed diazo-compounds.
Method 3, on the other hand permits only of a limited application, rendered
complicated by its very nature.
Of the bases employed according to method 2, only p-amidobenzeneazoalpha-
naphthylamine has hitherto yielded a dark and pure black and a general application
of this diamidoazo-body failed on account of the foaming of the diazo-printing colour
and its decomposition when printing in hot places.
My correspondents have shewn in their English Patent Application No. 30446
of 1897, that diamidocarbazoles are very appropriate for producing powerful and fast
brown tints on naphthol ground and they have now succeeded in obtaining a dark
violet and violet-black by coupling the tetrazo-compound of dimethylated diamido-
carbazole with 8-naphthol on the fibre.
The introduction of 2 methyl groups into the molecule of p-diamidocarbazole
evidently increases the tinctorial power of the B-naphtholazo-dyestuff and changes the
tints of the same in the direction of blue.
The diazo-colour printed in a sufficiently strong concentration yields on the usual
8-naphthol ground a full violet black very fast to soap and light and the prepared
diazo-printing colour is also sufficiently stable for practical use.
By a first print of resisting agents :-Tin salts or sulphite colours, the black can
also be resisted in white or variegated patterns.
The application of diamidodimethyl-carbazole for producing black on the fibre by
way of printing is carried out in the known manner :-

page_text: 100 gr. ice, to which is aqued
52 c.c. solution of sodium nitrite 290/1000.
After diazotisation the solution is filtered and made up to 500 c.c.
The above printing colour is printed on the cotton goods provided with naphthol
ground, then dried, washed and soaped in the usual manner.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
Method for the production on the fibre of azo-colours insoluble in water in tints
varying from violet-black to dark-black by combining the tetrazo-compounds of
diamidodimethylcarbazole with naphthol by way of printing or dyeing, substantially
as described.