A New Black Azo Dye Stuff and the Production of the same.
Year: 1892

page_text: Date of Application, 2nd Mar., 1892
Complete Specification Left, 24th Oct., 1892-Accepted, 10th Dec., 1892
PROVISIONAL SPECIFICATION.
[Communicated from abroad by GUSTAV ADOLF DAHL, of the firm of Dahl and
Company, of Barmen, in the Kingdom of Prussia, Dye-stuff Manufacturers.]
A New Black Azo Dye Stuff and the Production of the same.
I ADOLF BANG of Basinghall Street Leeds in the County of York Dye-stuff,
Merchant do hereby declare the nature of this invention to be as follows :-
Paraacetnaphtylenediamine (1 : 4) (Liebermann, Leibig's Annalen 183 p. 239) is
readily transformed into a mono sulphonic acid by means of fuming sulphuric acid
(of 25% anhydride). Now my communicator has found, that by the action of
the diazo-compound of this monosulphonic acid on a naphtylamine an hitherto ;
unknown naphtylamineazoacetnaphtalid sulphonic acid is obtained, which can be
again diazotised, and then, by combination with naphtolmono- and disulphonic
acids furnishes black dyeing azo dyestuffs for woollens and silks. The colours on
wool are fast to washing and milling those on silk are fast to washing.
Example of the production of the dyestuff.
30 kg. (66 lbs.) of paraacetnaphtylenediaminesulphonic acid are dissolved in
500 litres (110 gallons) of water, and diazotised with 35 kg. (77 lbs.) of hydro-
chloric acid and 7 kg. (15.4 lbs.) of sodic nitrite. This diazo compound is poured,
while well stirring, into a solution of 14.4 kg. (31.7 lbs.) of a-naphtylamine in
12 kg. (26-4 lbs.) of hydrochloric acid and 200 litres (44 gallons) of water, whereby
the amidoazo compound almost at once separates out. After the deposit has stood
about one day, it is further diazotised with a solution of 7 kg. (15.4 lbs.) of sodic
nitrite, and this new diazo compound is then combined with a solution of 35 kg.
(77 lbs.) of B-naphtoldisulphonic acid R kept alkaline by 30 kg. (66 lbs.) of soda.
The dye-stuff separates out at once.
Dah 14
Manch 1000
}
J. CLARK JEFFERSON, A.R.S.M., Wh. Sc.,
2, East Parade, Leeds, Agent for Applicant.
COMPLETE SPECIFICATION.
A New Black Azo Dye Stuff and the Production of the same.
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 :-
Paraacetnaphtylenediamine (1:4) (Liebermann, Liebig's Annalen 183 p. 239) is
readily transformed into a mono-sulphonic acid by means of fuming sulphuric acid
(of 25% anhydride). Now my coinmunicator has found that by the action of the
diazo compound of this monosulphonic acid on a naphtylamine an hitherto unknown
naphtylamineazoacetnaphtaldisulphonic acid is obtained, which can be again
diazotised, and then by combination with naphtolmono- and disulphonic acids
furnishes black dyeing azo dyestuff's for woollens and silks. The colours on wool
are fast to washing and milling; those on silk are fast to washing.
Example of the production of the dyestuff.
30 kg. (66 lbs.) of paraacetnaphtylenediaminesulphonic acid are dissolved in
500 litres (110 gallons) of water, and diazotised with 35 kg. (77 lbs.) of hydro-
chloric acid and 7 kg. (15-4 lbs.) of sodic nitrite. This diazo-compound is poured,

page_text: with well stirring into a solution of 14.4 kg. (31.7 lbs.) of a-naphtylamine in 12 kg.
(26-4 lbs.) of hydrochloric acid and 200 litres (44 gallons) of water, whereby the
amidoazo compound almost at once separates out. After the deposit has stood
about one day, it is further diazotised with a solution of 7 kg. (15.4 lbs.) of sodic
nitrite, and this new diazo compound is then combined with a solution of 35 kg.
(77 lbs.) of B-naphtoldisulphonic acid R kept alkaline by 30 kg. (66 lbs.) of soda.
The dye-stuff separates out at once.
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 :-
1st. The process for the production of a black azo dye, consisting in diazotising
paraacetnaphtylenediaminemonosulphonic acid, allowing (the resulting diazo
compound) to act upon a-naphtylamine, and again diazotising the a-naphtylamine-
azoacetnapthalidsulphonic acid thus obtained, and combining with ẞ naphtoldi-
sulphonic acid R.
2nd. The black azo dye stuff resulting from the process claimed in Claim 1st.
Dated this 22.1
2002
J. CLARK JEFFERSON, Assoc. R.S.M.,
2, East Parade, Leeds, Agent for Applicant.