A Substitute for India Rubber, Gutta-percha, and Substances of a like Nature, and Process for Manufacturing the same.
Year: 1895

page_text: Reprinted
as amended in accordance with the decision of the Comptroller-General,
dated the 12th day of October 1899.
Date of Application, 26th Oct., 1895-Accepted, 14th Dec., 1895
COMPLETE SPECIFICATION (AMENDED).
A Substitute for India Rubber, Gutta-percha, and Substances of a
like Nature, and Process for Manufacturing the same.
I, EUGEN HORNUNG, of XVIII, Weinerstrasse 76, Vienna, in the Empire of Austria,
Assistant Advocate, 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:-
My invention relates to a substitute for india rubber, gutta-percha and other
substances of a like nature such substitute having essential and important properties
similar to the said substances, but possessing the advantages of absence of smell,
greater durability and sunaller cost of manufacture.
This substitute consists essentially of a mass of glue, precipitated from its solution
by chemical agents, with the addition of a small quantity of india rubber, gutta-
percha, or their substitutes and if desired of a suitable inert substance.
I prepare this composition in the following manner :-
From an aqueous solution of glue made from animal bones and hides (gluten) or
glue made from animal cartilage (chondrine) or any suitable known animal or
vegetable substitute for glue, preferably isinglass, ichthyo colle francaise (glue made
from blood fibrine) fish glue made according to the Jennings, Stahlström and Puscher
process or agar-agar, the glue or the substitute for the same is precipitated by means
of tannic acid, alum, muriatic acid, chlorine (the latter only in those cases where
tungstate of soda has been added to the solution) or any other known agent suitable
for this purpose.
The precipitate thus obtained is then thoroughly mixed with 5%, or more, of
india-rubber, gutta-percha or their substitutes; then the mass is dried by evaporating
the water contained therein and finally employed for further manufacturing purposes
either in the pure state or with the addition of any desired inert substance such, for
instance, as pulverized cork, pulverized rubber waste, the so-called oil rubber, obtained
by boiling linseed oil with the addition of nitric acid, ground leather waste, cellulose,
wood fibre and other fibrous materials, hair, colouring materials, earths, soaps, rosins,
wax, paraffine, stearine, tar, asbestos, albuminous substances, fibrine, collodion,
caseine, starch, varnish, coal, graphite, emery, lime, minium, chalk, alumina, celluloid,
sulphur and combinations of sulphur in a powdered condition or in solution.
If it is desired that the mass should be particularly soft, I obtain this result by
the addition of vaseline, fats, oils or substitutes for the same, or of glycerine.
The further treatment of the said mass, in order to obtain articles which shall serve
as substitutes for those made of soft or hard rubber, is similar to the treatment of
india-rubber, gutta-percha or their substitutes; the articles made from my composi-
tion can also be vulcanized in the usual manner.

page_text: The composition made by the process described is suitable for making all articles
which have hitherto been made from hard or soft rubber or gutta-percba.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is:
1. A substitute for india rubber, gutta percha and substances of a like nature,
consisting of a mixture of glue, or a substitute for glue, precipitated from a solution
of glue or the substitute for glue with india rubber, gutta-perchn or their substitutes,
a suitable-inert substance such as those referred to being added when desired, sub-
stantially as described.
1. 2. The process for manufacturing a substitute for india-rubber, gutta-percha and the
like, the composition claimed in the first claiming clause, such process consisting
in precipitating glue or a substitute for the same from its solution, mixing the
precipitate thus obtained with india-rubber, gutta-percha or their substitutes,
evaporating the water contained in the mixture, finally adding if required a suitable
inert substance such as those referred to and, if it is desired that the mass should
remain soft, fats or oils, substantially as described.
Dated this 26th day of October 1805
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.