Manufacture of Induline Colouring Matters Soluble in Water.
Year: 1888

page_text: Date of Application, 10th Nov., 1888
Complete Specification Left, 6th Aug., 1889-Accepted, 14th Sept., 1889
PROVISIONAL SPECIFICATION.
[Communicated from abroad by the FARBWERKE VORMALS MEISTER LUOUIS AND
BRUNING, of Hoechst-am-Main, in the Empire of Germany, carrying on
business as Chemical Manufacturers.]
Manufacture of Induline Colouring Matters Soluble in Water.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the County
of Middlesex, Fellow of the Institute of Patent Agents, do hereby declare the nature
of this invention to be as follows:-
It is known that in the so called "induline melt" at temperatures below 130° C.
there is formed at first a violet blue colouring matter which is soluble in alcohol
and which when heated with aniline and hydrochlorate of aniline to higher
temperatures can be transformed into phenylderivatives having blue to green blue
shades of colour (Witt and Thomas, Chem. Soc. 1883 I page 112 German Patent
No. 17340). The direct employment of these colouring matters as dyes is prevented
by their being insoluble in water.
The communicators of this invention have discovered, that colouring matters of the
induline series soluble in water are obtained when the violet-blue induline mentioned
above as being formed in the induline-melt at low temperature is heated not with
aniline but with aromatic diamines to a temperature of 150° to 190° C.
Colouring matters are thus obtained with para-diamines of greenish and with meta-
diamines of reddish blue shades.
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Manufacture of Induline Colouring Matters Soluble in Water.
I, OLIVER IMRAY of No. 28 Southampton Buildings, Chancery Lane, in the County
of Middlesex, Fellow of the Institute of Patent Agents, 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 :-
It is known that in the so called "induline melt" at temperatures below 130° C.
there is formed at first a violet blue colouring matter which is soluble in alcohol and
which when heated with aniline and hydrochlorate of aniline to higher temperatures
can be transformed into phenylderivatives having blue to green blue shades of colour
(Witt and Thomas, Chem. Soc. 1883 I page 112 German Patent No. 17340). The
direct employment of these colouring matters as dyes is prevented by their being
insoluble in water.
The communicators of this invention have discovered, that colouring matters of the
induline series soluble in water are obtained when the violet-blue induline mentioned
above as being formed in the induline melt at low temperature is heated not with
aniline but with aromatic diamines to a temperature of 150° to 190° C.
Colouring matters are thus obtained with para-diamines of greenish and with meta-
diamines of reddish blue shades.
are, as described above, heated for 3 hours to 1500-160° C., the melt is dissolved in
diluted hydrochloric acid and the colouring matter is precipitated from the filtered
solution by the addition of common salt.
The reaction with paratoluylendiamine and with metatoluylendiamine is the same.
The colouring matters thus obtained are brown crystalline powders of copper like
justre, easily soluble in cold water.
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 :-
A manufacture of colouring matters of the induline series soluble in water wherein
induline is heated with paraphenylendiamine, metaphenylendiamine, paratoluylendia-
mine, or metatoluylendiamine to from 150 to 190 degrees centigrade.
Dated this 6th day of Anaust 1889
ABEL & IMRAY,
Agents for the Applicant.