Improvements relating to the Treatment of Dye-woods and their Extracts.
Year: 1890

page_text: Date of Application, 10th Mar., 1890
Complete Specification Left, 8th Dec., 1890-Accepted, 31st Jan.. 1891
ROVISIONAL SPECIFICATION.
Improvements relating to the Treatment of Dye-woods and their
Extracts.
1, MARTIN GABRIEL LINDEMANN, of Ottensen, near Hamburg, in the
German Empire, Chemist, do hereby declare the nature of this invention to be as
follows:-
This invention relates to the treatment of dye-woods, such as Campeachy-wood,
Brasil-wood and the like and the object of said invention is to increase the dyeing-
power of such woods or extracts.
To carry this invention into effect a diluted solution of a manganate or perman-
ganate of any base, preferably of permanganate of potassium or sodium is run
slowly, while stirring, into a bath containing the said dye-woods or their extracts,
or into the dyeing bath, containing such extracts. When very thick or pasty
extracts such for instance of from 15 to 30 degrees Beaumé are to be treated in the
manner set forth, they should be heated to near their boiling points to render
them more fluid and thereby more accessible for the action of the said chemical
agents.
With regard to the chemical reaction in this treatment I am of the opinion that
said manganate or permanganates act directly by their oxygen upon certain bodies
of the dye-woods and their extracts, not sufficiently, oxydised by the oxygen of the
air to transform them into actual colouring matters, such as the hematoxyline into
hematem which may combine after their oxydation with the mordants used in dyeing
and thereby form the colour upon the fibres. These oxydised matters are then
added to: the existing colouring matters to increase the colouring power of the
products or solutions.
г
For this reason also other oxydising means such as peroxide of hydrogen may be
used for the same purpose, without departing from the nature of my said invention,
but in practice the advantages realized by the said manganates or permanganates
are very important firstly, by reason of their relatively low prices and secondly, by
the simplicity of the manipulation and treatment, and the fact that these salts after
having acted upon the colouring matters do not affect the fibres of the stuff or yarn
nor the dye itself.
Dated this 10th day
1 1400
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements relating to the Treatment of Dye-woods and their
Extracts.
I, MARTIN GABRIEL LINDEMANN, of Ottensen, near Hamburg, in the
Empire of Germany, Chemist, 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 the treatment of dye-woods such as Campeachy-wood,
Brasil-wood and the like and the object of the said invention is to increase the
dyeing power of such woods or extracts.
To carry this invention into effect a diluted solution of a manganate or perman-
ganate of any base, preferably of permanganate of potassium or sodium is run
slowly, while stirring, into a bath containing said dye-woods or their extracts,
ונג .D

page_text: or into the dyeing-bath, containing such extracts. When very thick or pasty
extracts such for instance of from 15 to 30 degrees Beaumé are to be treated in
the manner set forth, they should be heated to near their boiling points to render
them more fluid and thereby more accessible for the action of the said chemical
agents.
or
In practice very good results are obtained for instance when using to 1 pound
of permanganate of potassium upon 100 pounds of an extract of dye-wood of
30 degrees Beaumé. When treating more or less concentrated extracts
decoctions, the quantities of the chemical agents to be used are to be increased
or diminished in proportion.
With regard to the chemical reaction in this treatment I am of the opinion
that said manganates or permanganates act directly by their oxygen upon certain
bodies of the dye-woods and their extracts, not sufficiently oxydized by the oxygen
of the air to transform them into actual colouring matters, such as the haematoxylin
into hacinatein, which may combine after their oxidation with the mordants used in
dyeing and thereby form the colour upon the fibres. These oxidized matters are
then added to the existing colouring matters to increase the colouring power of
the products or solutions.
Although I have only mentioned manganates or permanganates as oxidizing
agents wish it clearly understood that peroxide of hydrogen may also be used
for the same purpose, but in practice the advantages realized by the said
manganates or permanganates are very important firstly, by reason of their
relatively low prices and secondly, by the simplicity of the manipulation and
treatment, and the fact that these salts after having acted upon the colouring
matters do not affect the fibres of the stuff or yarn nor the dye itself.
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 :-
First. The treatment of dye-woods and of extracts or dyeing baths therefrom
by means of manganates or permanganates, or by peroxide of hydrogen, trans-
ferring directly oxygen upon the dye-woods or colouring matters, substantially as
and for the purpose set forth.
Second. In the process of extracting colouring matters from dye-woods the
addition of manganates or permanganates or of peroxide of hydrogen which act
directly by their oxygen upon the dye-woods or the colouring matters, substantially
as and for the purpose specified.
Third. As new articles or substances of manufacture the dye-woods and extracts
or dyeing baths of dye-woods, obtained by the treatment of the articles or
substances with manganates or permanganates or with peroxide of hydrogen, which
act directly by their oxygen upon the colouring matters, substantially as and for the
purpose herein before described.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.