IMPROVEMENTS IN DYEING ANILINE BLACK ON COTTON, UNSPUN, SPUN, WOVEN, OR IN OTHER CONDITION
Year: 1881

page_text: LETTERS PATENT to Gustav Jagenburg, of Rydboholm, in the Kingdom of
Sweden, for an Invention of "IMPROVEMENTS IN DYEING ANILINE BLACK
ON COTTON, UNSPUN, SPUN, WOVEN, OR IN OTHER CONDITION."
PROVISIONAL SPECIFICATION left by the said Gustav Jagenburg at the
Office of the Commissioners of Patents on the 16th August 1881.
Gustav JagenbuRG, of Rydboholm, in the Kingdom of Sweden. "IMPROVE-
MENTS IN DYEING ANILINE BLACK ON COTTON, UNSPUN, SPUN, WOVEN, OR IN
OTHER CONDITION."
In carrying my Invention into effect I place the cotton to be dyed in a bath of
a sufficiently concentrated solution of an aniline salt and chlorate of potash, or any
other chlorate. When the cotton has been sufficiently saturated it is taken out of
the bath, and the liquid is partly removed by pressing, wringing, or otherwise, and
the cotton is then put in a well ventilated room to dry.
The drying operation so unites the coloring matter with the cotton that it will
produce in the oxydizing process a fast and good black without any great loss of
coloring matter.
After drying the cotton is placed in a bath of bichromate of potash or any suitable
oxydizing agent which will form an aniline black.
When the required depth or shade of color is obtained the cotton is taken out of
the oxydizing solution and washed, and it is then ready for finishing in any desired
way.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Gustav Jagenburg in the Great Seal Patent Office on the
1st February 1882.
"
GUSTAV JAGENBURG, of Rydboholm, in the Kingdom of Sweden. IMPROVE-
MENTS IN DYEING ANILINE BLACK ON COTTON, UNSPUN, SPUN, WOVEN, OR IN
OTHER CONDITION."
In carrying out my Invention I place the cotton to be dyed in a bath of a con-
centrated solution of an aniline salt and chlorate of potash, or any other chlorate;

page_text: when the cotton has been sufficiently saturated it is taken out of the bath, and the
superfluous liquid is removed by pressing, wringing, or otherwise, and the cotton
is then put in a well ventilated room to dry.
The drying operation so unites the colouring matter with the cotton that it will
in the oxydizing process produce a fast and good black without any great loss of
colouring matter. After the cotton has been dried in a ventilated room it is placed
in a bath of bichromate of potash or any suitable oxydizing agent to form and fix
the aniline black.
When the required depth or shade of colour is obtained the cotton is taken out
of the oxydizing solution and washed, and it is then ready for finishing in any
desired way.
I find the following ingredients prepared in the manner and in the proportions
named will give good results:-
8
I dissolve 1 lb. aniline salt in /, gallon water at 50° centigrade, then dissolve
separately 1/2 lb. chlorate of potash in /, gallon water at 100° centigrade; these
are allowed to cool, and then both solutions are mixed together.
salt, aniline oil, with an acid may be used.
Instead of aniline
I thoroughly impregnate the material to be dyed with this mixture, and then
remove it from the bath and free it of superfluous liquor, and keep the bath,
which can be used again. I afterwards dry the material in a ventilated room.
I place the dried material in an oxydizing bath, which contains an oxydizing
agent necessary for forming an aniline black.
An advantageous combination for this bath may be formed by dissolving two
pounds bichromate of potash in six gallons of water. When the oxydation is
completed the dyed material is taken out and rinsed, and the bath kept as it can
be used again.
My process has the advantage of being cheaper than any other known process,
and the material thus dyed will resist sulphurous acid and not turn green by its
action, and unspun fibre will remain soft and suitable for spinning.
ง
This process besides being particularly adapted for dyeing cotton is also well a
suited for dyeing other textile fibre, and especially when this fibre is mixed or
woven with cotton fibre.
Having stated the nature of my Invention, and described the manner of
performing the same,
I declare that I claim,―
For dyeing cotton unspun, spun, woven, or in other condition, the combination
of an aniline salt with a chlorate, in a solution of which the cotton is immersed,
then dried in a ventilated room, and subsequently placed in an oxydizing bath, as
herein described.
In witness whereof, I, the said Gustav Jagenburg, have hereunto set my
hand and seal, this Twenty fifth day of January One thousand eight