An Improved Process for Manufacturing a Plastic Substance.
Year: 1894

page_text: Date of Application, 15th Mar., 1894
Complete Specification Left, 3rd Nov., 1894-Accepted, 15th Mar., 1895
An Improved Process for Manufacturing a Plastic Substance.
ALFRED RITTER VON PISCHOF, Am Hof 7, Vienna, in the Empire of Austria,
Civil Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved process for manufacturing a plastic
substance or compound, and consists therein that oil-preferably linseed oil-is put
into a boiler and heated until bubbles rise to the surface; viennese white is then
added in small quantities, (the mass being meanwhile constantly stirred) and after
these are thoroughly incorporated, zinc-white and water glass are added.
The zinc-white is added to refine the mass. For very fine articles, the viennese
white may be wholly or partly substituted by zinc-white, but the latter is too
expensive for ordinary requirements.
Without further additions, and the subsequent digesting process, the mass,
consisting of linseed-oil, viennese white and eventually zinc-white, would harden
to such an extent in about 3 weeks, that it would almost lose its plastic property.
To prevent such hardening, therefore, I add water glass, which keeps the amount
soft on account of the finished mass being allowed to digest over a fire until the
required consistency is obtained. If however, the digesting process be continued
too long, the mass will harden; it is therefore necessary to watch the mass during
the digesting process, and interrupt same at the proper moment.
.
To prevent any danger of fire, the boiler is closed and preferably heated by
steam; it is not necessary to make same air-tight. When the above mentioned
substances are thoroughly incorporated, it is advisable to add gum, minium and
asbestos; should the body becoine too viscid, it may be diluted by adding linseed-
oil, glycerine, paraffin or other suitable oil. If desired, a colouring matter, too,
may be added.
The mass can be worked into different articles by employing suitable moulds.
It will be evident that this mass is specially adapted for plastic moulds, which, on
account of their nature, cannot lose their form, and may be a preferable substitute
for gypsum.
Dated this 15th day of March 1894
HUGHES, ELI & HUGHES,
76, Chancery Lane, W.C., Agents for Applicant.
An Improved Process for Manufacturing a Plastic Substance.
I, ALFRED RITTER VON PISCHOF, of Am Hof 7 Vienna I in the Empire of
Austria, Civil Engineer, do hereby declare the nature of my said invention and
in what mauner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
This invention relates to an improved process for manufacturing a plastic
substance or compound, and consists therein that oil,-preferably linseed-oil,-say
50 parts by weight, is put into a boiler and heated until bubbles rise to the
surface about 80 parts by weight of viennese white is then added in small
TD 077

page_text: quantities (the mass being meanwhile constantly stirred) and after these are
thoroughly incorporated, the following substances are added separately: 5 parts
by weight zinc-white and 2 parts by weight water-glass. The zinc white is added
to refine the mass: For very fine articles, the viennese-white may be wholly or
partly substituted by zinc-white; the latter, however, is too expensive for ordinary
requirements.
Without further additions, and without being subjected to the subsequent
digesting process, this mass, consisting of linseed oil viennese-white and, if desired,
zinc-white, would harden to such an extent in about 3 weeks, that its plastic
property would almost be lost. To prevent such hardening therefore, I add the
above-mentioned quantity of water-glass, which renders the finished mass
permanently soft and plastic by digesting same over a slow fire until the desired
consistency is reached. If, however, the digesting process be continued too long,
the mass will harden; it is therefore necessary to watch same during the digesting
process, and to cut off the heat at the proper moment. To prevent any danger
arising from the fire, the closed boiler is preferably heated by steam; it is however
not necessary to make the boiler air-tight. When the above mentioned substances
are thoroughly incorporated, it is advisable to add 0.5 parts by weight of gum in
concentrated solution or also 0.2 parts by weight of minium and 1.5 to 2 parts by
weight of asbestos.
Should the mass become too viscid, it may be diluted by adding linseed-oil,
glycerine, paraffin or other suitable oil. If desired, a colouring matter, too, may
be added.
The mass can then be worked into different articles by means of suitable moulds.
It will also be evident that this composition is specially adapted for preparing
plastic moulds, which on account of their nature, cannot lose their form and thus
it is an excellent substitute for gypsum.
Having now ascertained and described the invention and in what manner the
same is to be performed, I declare that what I claim is :-
1. An improved process for manufacturing a plastic substance, consisting in
thoroughly incorporating viennese white or zinc-white with boiled linseed oil and
then adding water glass and heating the mass until a plastic substance of the
desired consistency obtained, substantially as described.
2. As a new commercial product, the plastic substance made as described in the
foregoing claim and as substantially set forth in the Specification.
Dated this 3rd day of November 1894.
HUGHES, ELI & HUGHES,
76, Chancery Lane, W.C., Agents for the Applicant.