IMPROVEMENTS IN THE TREATMENT OF OLD OR DECOMPOSED CAOUTCHOUC, FOR THE PRODUC- TION THEREFROM OF OILS, VARNISHES, AND MATERIALS FOR ADMIXTURE WITH CAOUTCHOUC AND OTHER SUBSTANCES.
Year: 1878

page_text: LETTERS PATENT to Ludwig Danck werth and Richard David Köhler, both of
St. Petersburg, in the Empire of Russia, for the Invention of "IMPROVEMENTS
IN THE TREATMENT OF OLD OR DECOMPOSED CAOUTCHOUC, FOR THE PRODUC-
TION THEREFROM OF OILS, VARNISHES, AND MATERIALS FOR ADMIXTURE WITH
CAOUTCHOUC AND OTHER SUBSTANCES.'
"
Sealed the 24th December 1878, and dated the 8th July 1878.
PROVISIONAL SPECIFICATION left by the said Ludwig Danckwerth_and_
Richard-David-Köhler-at-the Office of the Commissioners of Patents on the
8th July 1878.
LUDWIG DANCKWERTH and RICHARD DAVID KÖHLER, both of St. Petersburg, in
the Empire of Russia. "IMPROVEMENTS IN THE TREATMENT OF OLD OR DECOM-
POSED CAOUTCHOUC, FOR THE PRODUCTION THEREFROM OF OILS, VARNISHES, AND
MATERIALS FOR ADMIXTURE WITH CAOUTCHOUC AND OTHER SUBSTANCES."
According to our present Invention we submit old or decomposed caoutchouc,
such as old caoutchouc wares, to dry distillation in a boiler or retort by fire heat
combined with the action of superheated steam. By this means volatile substances
are distilled over from the caoutchouc which, when condensed, form oils, and a
substance which, when vulcanised, possesses in a great degree the properties of the
natural caoutchouc.
The lighter oils passing over at 60° to 105° Celsius are separated from the
heavier ones; the first serve for the production of varnishes, the latter ones for the
following operation -The heavy oils, after being separated from the lighter ones,
are mixed with hempseed, linseed, or other vegetable oils in different proportions,
as may be desired; the mixture so obtained can be transformed into the state of
varnish in the ordinary way by boiling or by chemical action.
The caoutchouc oil may also be transferred alone into varnish and mixed with
the varnish prepared of vegetable oils.

page_text: The working of the mass for the vulcanisation is performed by rollers, commonly
used in the manufacturing of vulcanised caoutchouc, as follows:-All the substances
necessary for the caoutchouc mixture to be prepared are intimately mixed together
by the rollers, and with this mixture are then incorporated seven to twenty per
cent. of sulphur. The quantity of sulphur to be embodied varies only according to
the quantity of caoutchouc or vulcanisable substances present in the mixture, with-
cut regard to the other substances present in the mixture for the purpose of dying,
consolidating, &c.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Ludwig Danckwerth and Richard David Köhler in the Great Seal
Patent Office on the 6th January 1879.
16
LUDWIG DANCKWERTH and RICHARD DAVID KÖHLER, both of St. Petersburg, in
the Empire of Russia. IMPROVEMENTS IN THE TREATMENT OF OLD OR DECOM-
POSED CAOUTCHOUC, FOR THE PRODUCTION THEREFROM OF OILS, VARNISHES, AND
MATERIALS FOR ADMIXTURE WITH CAOUTCHOUC AND OTHER SUBSTANCES."
According to our present Invention, we submit old or decomposed caoutchouc,
such as old caoutchouc wares, to dry distillation in a boiler or retort by fire heat
combined with the action of supherheated steam. By this means volatile substances
are distilled over from the caoutchouc which, when condensed, form oils, and a
substance which, when vulcanised, possesses in a great degree the properties of the
natural caoutchouc.
The lighter oils passing over at 60° to 105° Celsius are separated from the
heavier ones; the first serve for the production of varnishes, the latter ones for the
following operation:-The heavier oils after being separated from the lighter ones
are mixed with hempseed, linseed, or other vegetable oils, in different proportions
as may be desired; the mixture so obtained can be transformed into the state of
varnish in the ordinary way, by boiling or by chemical action.
The caoutchouc oil may also be transformed alone into varnish, and mixed with
the varnish prepared of vegetable oils.
The working of the mass for the vulcanisation is performed by rollers, commonly
used in the manufacturing of vulcanised caoutchouc, as follows:-All the substances
necessary for the caoutchouc mixture to be prepared are intimately mixed together
by the rollers, and with this mixture are then incorporated seven to twenty per
cent. of sulphur. The quantity of sulphur to be embodied varies only according to
the quantity of caoutchouc or vulcanisable substances present in the mixture, with-
out regard to the other substances present in the mixture for the purpose of dying,
consolidating, &c.
Having thus described the nature of our Invention and in what manner the same
is to be performed, we claim,―
First. The production of heavy caoutchouc oils from old or decomposed caout-
chouc by dry distillation, combined with the action of superheated steam,
substantially as and for the purposes herein set forth.
-Second. The use of heavy caoutchouc oils produced as set forth in the preceding
claim, and condensed or consolidated, as a substitute for or for admixture with
ordinary caoutchouc or caoutchouc compounds, substantially as herein set forth.
Third. The use of heavy caoutchouc oils produced as set forth in the first claim,
and condensed, for admixture with vegetable oils, or with varnishes prepared
therefrom, substantially as herein set forth.
Fourth. The use of the light caoutchouc oil produced as herein described for the
production of caoutchouc varnishes.
In witness whereof, I, the said Ludwig Danckwerth, have hereunto set my
hand and seal, this Twenty-eighth day of December, in the year of our
Lord One thousand eight hundred and seventy-eight.