Improvements in Printing and Dyeing on Fabrios.
Year: 1893

page_text: Date of Application, 31st Jan., 1898
Complete Specification Left, 30th Nov., 1893-Accepted, 13th Jan., 1894
PROVISIONAL SPECIFICATION.
Improvements in Printing and Dyeing on Fabrios.
I, OSCAR OSTERSETZER, Ph. D., of Sagau, Prussin, in the Empire of Germany,
do hereby declare the nature of this invention to be as follows :----
On account of the brilliancy of red-azodyes it has often been tried to print the
same with a discharge on bottoms dyed with so-called aniline-colors, but this has
hitherto not been possible, because all azodyes are destroyed by the means which
are used for discharging the bottom.
The object of this invention is to overcome this difficulty by developing the red
on the fibre. Not only red in its various shades, but also yellow, orange, brown
and other shades can be produced.
This invention may be carried out as follows: Recently a series of direct dyeing
cotton-dyes have been found, which can be diazotized on the fibro and developed to
new dyestuffs, which latter not only differ in shado from the original dyeing, but
also show a greater resistance to the actions of light, alkalis and acids.
These dyestuffs belong to two different groups, the first one of which is repre-
sented by the dyestuff named: primuline (thiochromogene, polychromine) the
second one by diamine black (diamine-blueblack, Nyanza- and Tabora-black,
diazurine, diazochromine).
The first one of these groups is distinguished from the second one by its resistance
against reducing agents. If therefore a printing paste, which contains a dyestuff
of the first group and a reducing agent is applied to a tissue dyed with a dyestuff
of the second group, this latter, after steaming, will disappear on the printed spots
whilst simultaneously the first one is fixed on these spots and a pattern can thus be
produced, which however does not possess the usually desired fastness to washing.
Dyestuffs however being selected which by the well known method may be
further diazotized and developed to shades fast to washing, it results that by
passing the goods through nitrite of soda and then through a bath containing a
suitable phenol or amine, both the printed and the bottom colors can be perfectly
fixed.
As developers the following may be particularly named, phenol, resorcin,
B naphthol, Schaeffer-acid, ethyl-3-naphthylamine, phenylenediamine.
On bottoms dyed as above mentioned there is obtained

page_text: Dye for instance with 5% diamine blueblack E with the usual addition of
glaubersalt and soda and then print thereon the following printing paste :
600 grs. primuline
dextrine
1000
"
2000
water
17
1200
"
900
"
zinc-dust
bisulphite 30°
120 glycerine
"
80
"
ammonia
then steam during one hour. After steaming in order to remove, the zinc-dust,
which would impair the formation of the new azodye, the goods are passed through
diluted muriatic acid and diazotized in a cold solution containing 300 grs. nitrite of
Boda and 1 litre muriatic acid of 21° Bé. to 200 litres water.
Then the goods are entered in a bath containing 400 grs, of ß3 naphthol dissolvod
in 110 grs. caustic soda and 100 litres water.
Instantly the shade of the bottom turns into a dark-blue and the print into red.
EXAMPLE II.
In order to produce red print on black ground, dye with 5% diamine black and
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Printing and Dyeing on Fabrics.
I, Oscar OstersETZER, Ph. D., of Sagan, Prussia, in the Empire of Germany,
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:-
On account of the brilliancy of red-azodyes it has often been tried to print the
same with a discharge ou bottoms dyed with so-called aniline-colors, but this has
hitherto not been possiblo, because all azodyes are destroyed by the means which
are used for discharging the bottom.
.
The object of this invention is to overcome this difficulty by developing the red
on the fibre. Not only red in its various shades, but also yellow, orange, brown
and other shades can be produced.
This invention may be carried out as follows:
Recently a series of direct dyeing cotton dyes have been found, which can be
diazotized on the fibre and developed to new dyestuffs, which latter not only differ
in shade from the original dyeing, but also show a greater resistance to the actions
of light, alkalis and acids.
These dyestuffs belong to two different groups, the first one of which is repre-
sented by the dyestuff named: primuline (thiochromogene, polychromino) the
second one by diamine black (diamine-blueblack, Nyauza- and Tabora-black,
diazurine, diazochromine).
The first one of these groups is distinguished from the second one by its
resistance against reducing agents. If therefore a printing paste, which contains a
dyestuff of the first group and a reducing agent is applied to a tissue dyed with a

page_text: dyestuff of the second group, this latter, after steaming, will disappear on the
printed spots whilst simultaneously the first one is fixed on these spots and a pattern,
can thus be produced, which however does not possess the usually desired fastness..
to washing.
Dyestuffs however being selected which by the well known method may be.
further diazotized and developed to shades fast to washing, it results that by
passing the goods through nitrite of soda and then through a bath containing a.
suitable phenol or amine, both the printed and the bottom colours can be perfectly
fixed.
As developers the following may be particularly named, phenol, resorcin,.
naphthol, Schaeffer-acid, ethyl-3-paphthylamine, phenylenediamine.
On bottoms dyed as above mentioned there is obtained

page_text: which is non-resistant against reducing agents (such as dismine black, diamine blue
black, Nyanza black, Tabora black, diazurine, diazo chromine): then printing
upon the dyed fabric with a colouring matter which is resistant against reducing
agents (such as primuline thiochromogene polychromine) together with a reducing
agent (such as sino-dust); then causing the reducing agent to react on the dye in b
the fabric; then diazotizing, and finally combining a developer (such as phenol
resorcin, naphthol, Schaeffer's acid, ethyl-6-naphthylamine, phenylenediamine)
with the colouring matters already upon the fabric.
2. Fabrics dyed and printed substantially as herein described.
Dated thia Besh'dow of Novemba 1982