Improvements in Treating Gutta Percha.
Year: 1894

page_text: Date of Application, 19th Dec., 1894
Complete Specification Left, 12th Sept., 1895-Accepted, 12th Oct., 1895
PROVISIONAL SPECIFICATION.
Improvements in Treating Gutta Percha.
We, ROBERT HUTCHISON, of Earlston, Prestwick, in the County of Ayr,
North Britain, Merchant, and JAMES BINNIE, Barassie, in the same county,
Chemical Manufacturer, do hereby declare the nature of this invention to be as
follows, that is to say :-
This invention has for its object, by improvements in treating gutta percha to
obtain a substance of a compact, moderately-hard, and springy character, advan-
tageously applicable for making various articles which are desired to possess the
properties indicated.
In carrying out the invention the gutta percha is first dissolved in oleic acid
with the aid of heat. The proportion of oleic acid may be varied but about
two parts by weight of the acid to each part of gutta percha give satisfactory
results. The heat which should be about that of boiling water may be applied in
any convenient way, as for example by means of a steam-jacketed pan, and
accompanied by mechanical stirring or agitation, or by means of open steam in jets
which act as stirring agents. The whole of the crude gutta percha becomes
dissolved in the oleic acid when hot, but on cooling a portion separates in flakes or
separate particles, the remainder, which is comparatively soft or oleaginous
remaining in solution.
The part which separates out of solution on cooling is the substance to obtain
which is the object of the invention. It is freed from the bulk of the oleic solution
by simple pressure; whilst to remove remaining adherent portions advantage is
taken of the property of oleic acid to form a soap with alkali, and is washed out
by means of water having in solution caustic soda or potash. To insure complete
washing out mechanical mixing or kneading apparatus is, preferably, employed.
The substance separated, as hereinbefore described, in an undissolved state, and
which may be appropriately termed Tabanite is dried and is made into the desired
articles with the aid of heat by compression, or moulding, or in any other
convenient way.
Instead of oleic acid any suitable oil yielding oleic acid may be used.
Dated this Eighteenth day of December 186A
protein freating Gutta Perona.
We, ROBERT HUTCHISON, of Earlston, Prestwick, in the County of Ayr,
North Britain, Merchant, and JAMES BINNIE, Barassie, in the same county,
Chemical Manufacturer, 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, that is to say :-
This invention has for its object, by improvements in treating gutta percha to

page_text: obtain a substance of a compact, moderately-hard, and springy character, advan-
tangeously applicable for making various articles which are desired to possess the
properties indicated.
In carrying out the invention the gutta percha is first dissolved in oleic acid
with the aid of heat. The proportion of oleic acid may be varied but about
two parts by weight of the acid to each part of gutta percha give satisfactory
results. The heat which should be about that of boiling water may be applied in
any convenient way, as for example by means of a steam-jacketed pan, and
accompanied by mechanical stirring or agitation, or by means of open steam in jets
which act as stirring agents. The whole of the crude gutta percha becomes
dissolved in the oleic acid when hot, but on cooling a portion separates in flakes or
separate particles, the remainder, which is comparatively soft or oleaginous
remaining in solution.
The part which separates out of solution on cooling is the substance to obtain
which is the object of the invention. It is freed from the bulk of the oleic solution
by simple pressure, whilst to remove remaining adherent portions advantage is
taken of the property of oleic acid to form a soap with alkali, and is washed ont
by means of water having in solution caustic soda or potash. To insure complete
washing out mechanical mixing or kneading apparatus is, preferably, employed.
The substance separated, as herein before described, in an undissolved state, and
which may be appropriately termed Tabanite is dried and is made into the desired
articles with the aid of heat by compression, or moulding, or in any other
convenient way.
Instead of oleic acid any suitable oil yielding oleic acid may be used.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
In treating gutta percha, dissolving the crude gutta percha in oleic acid or
equivalent and afterwards separating the part which does not remain dissolved
on the cooling of the solution substantially as hereinbefore described.
Dated this Eleventh day of September 1895.
EDMUND HUNT,
Applicants' Agent.