Manufacture of New Colouring Matters.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Manufacture of New Colouring Matters.
We, JEAN CLAUDE LOUIS DURAND, DANIEL EDOUARD HUGUENIN, and
ADOLPHE JEAN JAMES D'ANDIRAN, trading as la Société L. Durand, Huguenin
& Cie., of Bale, Switzerland, Manufacturers, 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 relates to new coloring matters derived from those described in the
Patents No. 11848 of 1889, and No. 15360 of 1889. The preparation of these
new coloring matters is as follows:-
The coloring matters described in the Patents No. 11848 of 1889 and No. 15360
of 1889 are treated with aniline or one of its homologues, such as ortho- and para-
toluidine, the xylidines, the naphthylamines or with para or meta phenylene-
diamine &c., or with a mixture of two or more of these amines, to a temperature
varying between 100° and 200° Cent.; there are thus formed new bodies which are
distinguished from the coloring matters described in the said Patents by their
crystallizing properties and by their solubility in concentrated sulphuric acid. Thus
while the coloring matters described in the above named Patents dissolve with a
blue color in concentrated sulphuric acid, the new bodies obtained by the above
named treatment dissolve with a cherry-red color in the same acid.
These new bodies give, by a treatment with sulphuric acid, sulpho acids which
are new blue coloring matters, and these sulpho acids are formed either at
100° Cent., with monohydrated sulphuric acid, or at ordinary temperature, or
under refrigeration, with sulphuric acids containing variable proportions of sulphuric
anhydride.
The tints of these sulpho acids do not vary greatly, provided that monohydrated
sulphuric acid or sulphuric anhydride has been used for the process.
They form coloring matters that dye wool and silk blue in an acidulated bath,
they also dye on mordants such as those of chromium, iron &c., giving darker but
less bright tints.
We will describe as an example one mode of carrying out the invention, for
obtaining the bodies in question, without limiting ourselves to the proportions or
temperatures indicated for the particular example given.
Example 1 part of the blue obtained according to Patent No. 118488 by the
action of the product of condensation of tannin with aniline on hydrochlorate of
nitrosodimethylaniline, is mixed with two parts of pure aniline, and this mixture is
heated on an oil bath during two hours at the temperature of 140° C. The mass
first becomes very thick but afterwards liquifies and ultimately becomes perfectly
liquid.
It is then left to cool; the new body crystallises in flakes of a coppery red
lustre, while the body originally employed crystallises in the form of green needles.
The new body thus produced is separated from the excess of aniline by washing in
alechal

page_text: For the new blue coloring matter derived from the substance produced as
above described, we dissolve I part of the substance in four parts of mono-
hydrated sulphuric acid, heating the mixture during several hours in a' water
bath. The solution is then poured into a large quantity of water, the remaining
excess of sulphuric acid is neutralized by means of lime, the solution is filtered,
and the blue which remains in the liquor is transformed into soda or ammonia
salts, which are evaporated to dryness after having separated the lime.
If in the above process funing sulphuric acid containing say 20 p. c. of
anhydride be substituted for the monohydrated acid, any elevation of the
temperature above from 15° to 18° C. during the introduction of the said body
must be avoided, otherwise there would be destruction of the coloring matter.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
:-
1. The herein described process of treating the coloring matters described in
the Patents Nos. 11848 and 15360 of 1889 with an aromatic mono-amine or
a diamine such as aniline, or otho- and para-toluidine, xylidine, naphthylamine,
para- and meta-phenyline diamine &c. or with a mixture of two or more of these
amines at a temperature of from 100° to 200° C.
2. As new articles of manufacture the bodies obtained by the process referred
to in the preceding claim.
3. The herein described process of obtaining new coloring matters by treating
with sulphuric acid the bodies obtained by the process referred to in the first
claim, so as to transform them into sulpho conjugated acids capable of being
employed either as such or after having been transformed into salts.
4. As new articles of manufacture, the coloring matters produced by the
process referred to in the preceding claim.
Dated this 12th day of January 1891.
ABEL & IMRAY,
Agents for the Applicants.