The Production of Fast Yellow Mordant Dyeing Azo Dye-stuffs.
Year: 1892

page_text: Date of Application, 18th Jan., 1892-Accepted, 19th Mar., 1892.
WUMI DEIN DI BUITIVATION.
[Communicated from abroad by GUSTAV ADOLF DAHL, of the firm of
Dahl and Company, of Barmen, in the Kingdom of Prussia, Dye-stuff
Manufacturers.]
The Production of Fast Yellow Mordant Dyeing Azo Dye-stuffs.
I ADOLF BANG of Basinghall Street Leeds in the County of York, Dye-stuff
Merchant, 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 :-
A good substitute for fustic has not up to the present existed. The advantage
of fustic dye stuff, and its extensive application for dyeing and printing rest upon
its property of dyeing chromated wool absolutely fast to milling operations; the
disadvantage of the dye stuff is in its insufficient fastness to light."
Up to the present only one dye-stuff has been known, which can be applied in a
similar manner to fustic extract, and this is the combination from diazotised
nitraniline and salicylic acid patented by O. Imray (R. Nietz Ri, Basle,
Switzerland) and described in the Specification of English Letters Patcut
No. 17583 under date 21st December 1887. But this dye also is not faster than
fustic.
Now my communicator's firm have discovered, that by the action of diazotised
alpha- and beta-naphthylamine sulpho acids on salicylic acid, ortho-, and meta-
cresotin acid, dye stuffs may be obtained, which in similar shades to fustic may be
fixed on fibres mordanted with chromium, and besides being absolutely fast to
milling operations, possess also the advantage of fastness to light.
These dye stuff's may also be fixed in beautiful yellow shades on wool not treated
with chromium, and the colours are likewise extremely fast both to milling
operations and to light.
As suitable diazo compounds for the production of these dye stuffs, the four up
to the present known beta-naphthylaminemono-sulpho acids, as well as the alpha-
naphthylamine-mono-sulpho acids of Laurent and Piria have proved themselves.
From the beta-naphthylamine-sulpho acids more greenish yellow, and from the
alpha-naphthylamine-sulpho acids more orange yellow dye stuffs are obtained. The
influence of the oxycarbon acids, which are employed, is shewn, in that by means
of salicylic acid somewhat greener dye stuff's are obtained than with the two
cresotine acids.
The following example of the production of the dye stuff's will serve to shew or
illustrate how my invention is to be performed.
24.5 kilogrammes (= 54 lbs.) of naphthylamine sulphonate of soda are dissolved
in 200 litres (44 gallons) of water, and as usual diazotised with 30 kilogrammes
(66 lbs.) of hydrochloric acid of 30% strength and 7 kilogrammes (15.4 lbs.) of
sodic nitrite.
==
This diazo compound is allowed to flow into a cold solution of 14 kilogrammes
(30.8 lbs.) of salicylic acid (or 16 kilogrammes 35-2 lbs. of cresotine acid) in
30 kilogrammes (66 lbs.) of soda and 200 litres (44 gallons) of water. After
standing one day, the dye stuff is separated out with common salt, pressed and
dried.

page_text: 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 :-
Yellow mordant-dyeing azo dye stuffs, and the production of the same, from and
by the combination of the diazo compounds of
B-naphthylamine-a-sulpho acid,
B-naphthylamine-ẞ-sulpho acid,
B-naphthylamine-y-sulpho acid,
B-naphthylamine-&-sulpho acid,
and also of the two a-naphthylamine sulpho acids of Laurent and Piria with
salicylic acid, or ortho- or meta-cresotine acid.
Dated this 16th day of January 1892.
J. CLARK JEFFERSON, A.R.S.M. Wh. Sc.,
2, East Parade, Leeds, Agent for Applicant.
J. CLARK JEFFERSON, A.R.S.M. Wh. Sc.,
2, East Parade, Leeds, Agent for Applicant.