IMPROVED SUBSTITUTE FOR GUTTA PERCHA FOR INSULATING WATERPROOFING, AND OTHER PURPOSES "
Year: 1882

page_text: LETTERS PATENT to Maximilian Zingler of 19 Buckland Crescent Belsize
Park in the County of Middlesex, Fellow of the Chemical Society, for an
invention of "IMPROVED SUBSTITUTE FOR GUTTA PERCHA FOR INSULATING
WATERPROOFING, AND OTHER PURPOSES
"
PROVISIONAL SPECIFICATION left by the said Maximilian Zingler at
the Office of the Commissioners of Patents on the 9th March 1882.
MAXIMILIAN ZINGLER of 19 Buckland Crescent Belsize Park, in the County of
Middlesex, Fellow of the Chemical Society, " IMPROVED SUBSTITUTE FOR GUTTA
PERCHA, FOR INSULATING, WATERPROOFING AND OTHER PURPOSES
"
I dissolve any of the hard gums or any of the gum resins, which I previously
powder in either turpentine oil or turpentine or oxidized turpentine either by heat
or in a cold state. In the cold state I may use methylated spirit, petroleum, ether
or bisulphide of carbon, either alone or mixed with turpentine oil.-When
dissolving the hard gum by heat in turpentine, I add a small quantity of camphor
to facilitate the dissolving of the gum.
To the turpentine oil, I add a small quantity of either sulphur or flower of
sulphur or sulphurous acid, the quantity depending on the hardness of the material
I wish to produce.
When the gum and sulphur is thoroughly dissolved I continue the boiling with
a small addition of albumen preferably at a reduced heat, until it assumes a certain
consistency.
I then dissolve in water or methylated spirit or ether a certain quantity say
from 10 to 30% (of the quantity of gum) of either tannic acid or powered nut-
gall or catechu, or any tannine.
D
In this tannic solution, I boil for several hours the gum solution, until it assumes
the consistency required.
It is then left to dry or may at once be well kneaded in hot or cold water, rolled
and pressed
If the gum solution is boiled in the tannic methylated solution, the liquid may
at once be used for water proofing or for varnishing and other purposes.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Maximilian Zingler in the Great Seal Patent Office on the
8th September 1882.
MAXIMILIAN ZINGLER of Buckland Crescent Belsize Park in the County of
Middlesex, Fellow of the Chemical Society, " IMPROVED SUBSTITUTE FOR GUTTA
PERCHA FOR INSULATING WATERPROOFING AND OTHER PURPOSES
"
My Invention consists substantially as follows:-I dissolve any of the hard
gums or any of the gum resins which I previously powder in either turpentine oil
or turpentine or oxidized turpentine either by heat or in a cold state.-In the cold
state I may use methylated spirit, petroleum, ether or bisulphide of carbon, either
alone or mixed with turpentine oil. When dissolving the hard gum by heat in
turpentine I add a small quantity of camphor to facilitate the dissolving of the
gum. To the turpentine oil I add a small quantity of either sulphur or flower of
sulphur or sulphurous acid, the quantity depending on the bardness of the material
I wish to produce. When the gum and sulphur is thoroughly dissolved, I continue
the boiling with a small addition of albumen, preferably at a reduced heat, until
it assumes a certain consistency.-I then dissolve in water or methylated spirit or
ether a certain quantity say from ten to thirty per cent. of the quantity of gum,
of either tannic acid or powdered nut gall or catechu or any tannine.-In this
tannic solution I boil the gum solution for several hours, until it assumes the
consistency required. It is then left to dry or may at once be well kneaded in hot
or cold water rolled and pressed.- If the gum solution is boiled in the tannic
methylated solution the liquid may at once be used for waterproofing or for
varnishing and other purposes.
In order that my Invention may be fully understood, I proceed substantially as
follows:-
1. To say one hundred pounds of gum resin I add say one hundred pounds of
turpentine or petroleum or any spirit solvent, such as camphine rosin spirit etc.,
and whilst heating the same or at the same time I add say twelve and a half
pounds of flower of sulphur (which however may be omitted) or I may put a
smaller quantity of the same.
2. I further add ten pounds (or more or less according to the softness of the
material required) of vegetable oil either oxidized or treated with say ten to
twenty per cent of sulphuric or nitric acid, if the latter, the acid must be previously
washed out with water or evaporated.-I prefer to use castor oil.
3. To the gum I sometimes add 25 pounds or more of oxidized calophon or other
bituminous substance.
4. When the whole is thoroughly mixed I dissolve it by heat at about 180 to
212 degrees Fahrenheit.
5. I mix first by small quantities say twelve to fifteen pounds of either vegetable
albumen or extract from lichen-such as Irish moss or in preference casein,
previously dissolved in methylated spirit and ammonium.
6. When the whole is thoroughly mixed and incorporated I pour in ten pounds
or more of tannic acid previously dissolved in aqueous or spent solution.
7. I then continue the boiling of the whole mass for two or three hours or more
at the degree of heat say 180° Fahrenheit.
8. It may afterwards be rolled out or boiled in water with ten per cent of
sulphuric acid, or vulcanized or again dissolved in spirits or benzine if required
for waterproofing.
9. I may add to the mass when in solution or not fibrous material or india
rubber (fresh or used up) or gutta percha.-This substitute for gutta percha I call
gum percha.

page_text: Having now particularly described and ascertained the nature of the said
Invention and in what manner same is to be performed or carried out in practice,
I hereby declare that I claim the Invention of "Improved substitute for gutta
percha for insulating waterproofing and other purposes," substantially as herein-
before set forth and described, wherein a point or feature is the use of tannin
substantially as and for the purposes described.
In witness whereof I the said Maximilian Zingler have hereunto set my
hand and seal this thirty first day of August in the year of our Lord One
thousand eight hundred and eighty two.
Witness.
T. MORGAN
21 Cockspur Street
London S.W.
M. ZINGLER. (L.S.)