Manufacture of Blueish Black Coloring Matters.
Year: 1888

page_text: Date of Application, 17th Dec., 1888
Complete Specification Loft, 4th Sont 1889 Accented 12th Oct.
1889
PROVISIONAL SPECIFICATION.
Manufacture of Blueish Black Coloring Matters.
I, SYDNEY PITT of Sutton in the County of Surrey Gentleman (a communication
to me from abroad by Leopold Cassella & Co. Frankfort-on-Main, Germany Manu-
facturing Chemists) do hereby declare the nature of this invention to be as follows:-
My Correspondents have a British Patent N° 92148. There is described in the
Specification of this Patent a process which yields azo-dyestuffs of the general
formula
The black color producing tetrazoderivatives discovered by us can be combined
with amines in the same way as with phenoles, thus we make dyestuffs form a
and naphtylamine from naphtionic acid from the so called Brönner acid and from
our naphtylamine sulphonic acid F.
Example. The tetrazocompound from 32 Kilos diazonaphtalinedisulphonic
acid 14, 3 K° a naphtylamine and 7 K° nitrite of soda we add to a solution
of 18 Ko chlorhydrate of naphtylamine. The free dyestuff-acid separates, it is
then filtered, dissolved in soda and the dye stuff is precipitated with common salt.

page_text: If in place of the naphtylamines the secondary and tertiary amidonaphtalines are
used, somewhat bluer dyestuffs are obtained than those enumerated under IV.
principally when phenyl-a-or ẞ naphtylamine is used.
Example. The tetrazocompound form 32 K° a diazonaphtaline disulphonic
acid 14, 3 K° a naphtylamine, 7 K° nitrite of soda, we add to an alcoholic solution
of 22 K° a phenylnaphtylamine when the reaction is terminated we neutralize
with soda and separate the dyestuff by filtration.
Dated this 17th day of December 1888
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Manufacture of Blueish Black Coloring Matters.
I, SYDNEY PITT of Sutton in the County of Surrey, Gentleman, (a communica-
tion to me from abroad by Leopold Cassella & Co. Frankfort-on-Maine, Germany, 1
Manufacturing Chemists) 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 :-
This invention which has for its object the manufacture of blueish-black coloring
matters is described by my correspondents as follows:
:-
In our British Patont No. 92148 we have described a process which yields
azo-dyestuffs of the general formula
с
In lieu of the naphtylamine sulphonic acids heretofore used and known at the date
of our Patent 92148 we use the ẞ naplitylamine sulphonic acid F of our British 3
Patent No 129088 or the naphtol & disulphonic acid of our British Patent N° 826587,
or the amido acids obtained by heating with ammonia the naphtoldisulphonic acid
described in the German Patent No 38281, or the a naphtylamine & sulphonic acid of
the German Patents N° 40571 and N° 45776. Particularly valuable dyestuffs are
formed by the polysulphonic acids.
3
In lieu of the naphtolsulphonic acids described in our British Patent N° 92148 we
use the naphtolsulphonic acid F of our British Patent N° 1290880, or the naphtolmono-
and disulphonic acids S of the German Patent N° 40571, or the naphtolsulphonic acid
of the German Patent N° 38281, or the ẞ-naphtol & disulphonic acid of our British
Patent N° 826587; the latter acid produces a black of a very blueish tint.

page_text: deutschen chemischen Gesellschaft Vol. XIII page 1959 and German Patent 41934)
or by treating naphtaline tri- or tetrasulphonic acid with alkalies (German Patents
N° 40893 and 42261) or by heating under pressure naphtoldisulphonic acids with
aqueous alkalies. The black dyestuffs thus obtained are generally easier soluble than
the naphtol-colors the shades are similar.
IY.
The black color producing tetrazoderivatives discovered by us as stated above in
section 1 and in the aforesaid patent N° 92148 can be combined with amines, in the
same way as with Phenoles. Thus we make for instance dyestuffs from a and B
naphtylamine from naphtionic acid, from the so-called Broenner-acid and from our
B naphtylamine sulphonic acid F.
Example: The tetrazo compound from 32 Kilos Diazonaphtaline disulphonic
acid, 14.3 Kilos a naphtylamine and 7 Kilos Nitrite of soda, we add to a solution
of 18 Kilos chlorhydrate of B-naphtylamine. The free dyestuff-acid separates, it is
then filtered, dissolved in soda, and the dyestuff is precipitated with common salt.
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:
1. The improvements in the production of black and blueish-black azo-dyestuffs
according to the general process of the British Patent No 92148 and consisting in
(a) Replacing the compounds heretofore employed by their isomers the naphtol
sulphonic and naphtylamine-sulphonic acids mentioned above under I and II.
(b) Replacing the naphtols and their sulpho acids by the dioxynaphtalines and
their sulpho acids, substantially as described above under III.
(c) Replacing the naphtols and their sulpho acids by the naphtylamines and their
sulpho acids, substantially as described above under IV.
2. As new products of manufacture the dye-stuffs obtained by the processes claimed
above.
Dated this 4th day of September 1889.
CARPMAEL & Co.,
Agents for the Applicant.