Manufacture of Poly-azo Colouring Matters.
Year: 1895

page_text: Date of Application, 13th May, 1895
Complete Specification Left, 20th Jan., 1896-Accepted, 22nd Feb.,
1896
PROVISIONAL OF BUITIATION.
[Communicated from abroad by THE ACTIEN GESELLSCHAFT FÜR
ANILIN FABRIKATION, of Berlin, in the Empire of Germany, Chemical
Manufacturers.]
Manufacture of Poly-azo Colouring Matters.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery
Lane, in the County of London, Consulting Engineer and Chartered Patent
Agent, do hereby declare the nature of this invention to be as follows:-
The invention relates to the production of a new series of direct dyeing
colouring matters which are derivatives of diazo compounds possessing the
following typical constitution :
X and Y signifying an amido or a hydroxyl group, whilst R signifies the radical
of any aromatic diazo compound. Moreover the benzene nucleus carrying the two
diazo groups may be substituted by the sulpho group and the like.
The products from which such diazo compounds are derived may be obtained,
for instance, by reacting upon a sulpho acid of an amidonaphthol, dihydroxy-
naphthaline or naphthylenediamine with one molecule of an aromatic diazo
compound and one molecule of para-niti odiazobenzene and subsequent reduction
by means of alkalı sulphides.
My foreign correspondents have discovered that the aforementioned diazo
compounds when combined with phenoles, amines, diamines &c. yield valuable
colouring matters, which generally are distinguished by their deep and dark
shades and by their intensity.
If for instance the diazo compound

page_text: colouring matter is produced dyeing unmordanted cotton deep black shades; by
combining the aforesaid dinzo compound with ẞ-naphthol, a dark blue dye is
produced. Colouring matters of similar properties are obtained by combining
with one molecule of meta-toluylenediamine or ẞ-naphthol one of the following
diazo compounds.
Manufacture of Poly-azo Colouring Matters.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery
Lane, in the County of London, Consulting Engineer and Chartered Patent 1
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 :-
The invention relates to the production of a
new series of direct dyeing

page_text: colouring matters which are derivatives of diazo compounds possessing the
following typical constitution :
X and Y signifying an amido or a hydroxyl group, whilst R signifies the radical
of any aromatic diazo compound, combined with the naphthaline-nucleus but in
itself containing no diazotizable amido-group
Moi cover for the hydrogen atoms of the benzine nucleus carrying the two
diazo groups may be substituted the sulpho group and the like.
The products from which such diazo compounds are derived may be obtained,
for instance, by reacting upon a sulpho acid of an amidonaphthol, dihydroxy-
naphthaline or naphthylenediamine with one molecule of an aromatic diazo com-
pound and one molecule of para-nitrodiazobenzene and subsequent reduction by
means of alkali sulphides.
My foreign correspondents have discovered that the aforementioned diazo
compounds when combined with phenoles, amines, diamines &c. yield valuable
colouring matters, which generally are distinguished by their deep and dark shades
and by their intensity.
The following examples may serve to illustrate the present invention.
are diazotised by means of 3-5 kilos of nitrite of soda. The dark blue solution of
the diazo-compound is allowed to flow into a solution, maintained alkaline by
carbonate of soda, of 5.5 kilos of metatoluylenediamine.
The combination being completed, the colouring matter formed separates as a
blue-black precipitate. After stirring for some time the whole is heated on the
water bath, the colouring matter is filtered off, pressed and dried. It is readily
soluble in water and dyes unmordanted cotton black shades.
If in the above example for the toluylenediamine be substituted the equivalent

page_text: LSO,HI
are diazotised and combined as described in the previous example with the
equivalent quantities of meta-toluylenediamine or B-naphthol. The dye-stuffs
formed dye cotton directly from a salt oi soap bath black or black-blue shades 20
respectively. It lies within the scope of this invention that the lotter "R" in the
general formula may represent complex derivatives, as for instance the socalled
"intermediate products "obtained by tetrazotising a para-diamine and subsequently
combining it with one equivalent quantity of any suitable component. As a

page_text: typical representative of such complex derivatives a compound having the following
formula may be used.
in which X and Y signify an amido- or hydroxyl-group, and R indicates the
15 radical of any aromatic diazo-compound combined with the naphthaline nucleus
but, in itself, containing no diazotisable amido group.
2. The products manufactured as above set forth.
Dated this out do. of Ta100c
ABEL & IMRAY,
Agents for the Applicant.