Improvements in the Treatment of India-rubber for the Purpose of Dissolving it or Rendering it Soluble.
Year: 1889

page_text: Date of Application, 7th Sept., 1889
Complete Specification Left, 24th May, 1890--Accepted, 6th Sept., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Treatment of India-rubber for the Purpose of
Dissolving it or Rendering it Soluble.
I SEPTIMUS KENYON, of Warrington in the County of Lancaster, Oil and Varnish
Manufacturer, do hereby declare the nature of this invention to be as follows:
This invention chiefly relates to the treatment of old or once used india rubber
which has been vulcanized or otherwise treated in the course of manufacture, though
it may also be applied to new or unmanufactured india rubber.
It consists essentially in treating the india rubber at high temperature with a
distillate or foots obtained from gums or gum resins used in the manufacture of
varnish, thick pine oils, resin or resinous oils.
In carrying out the invention I take the rubber to be treated after being reduced to
small particles and preferably in a cold state mix with it a quantity equal to about half
its weight of the distillate or distilled fumes obtained in the manufacture of varnish.
These when mixed are heated in a suitable pan or still to a high temperature until
the whole assume a viscid condition. The fumes which pass off during the process
carry away with them most of the sulphur used in the vulcanization of the rubber.
The mass when cold is of plastic viscid or semi solid consistency which may then be
treated with naphtha spirit or other substance now employed for dissolving pure india
rubber. The consistency of the material will depend largely on the exact amount of
the solvent used.
Although I prefer the varnish distillate I also find that other materials such as thick
pine oils, pure or boiled, resin and resinous oils or varnish foots may be used for the
purpose.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
Improvements in the Treatment of India-rubber for the Purpose of
Dissolving it or Rendering it Soluble.
I, SEPTIMUS KENYON, of Warrington, in the County of Lancaster, Oil and Varnish
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:-
:-
This invention relates to the treatment of old or used india-rubber, which has been
vulcanised or otherwise prepared in the course of manufacture, with the object of
dissolving it or rendering it capable of being worked up again.
It consists essentially in treating the indiarubber, while subjected to a high tempera-
ture, with a distillate or foots produced in the manufacture of varnish from gums or
gum resins, or with thick pine oils, resin or resinous oils.
In carrying out the invention, I first grind the old rubber or reduce it to a fine
state of subdivision and then mix with it a quantity of the distillate or distilled fumes
produced in the manufacture of varnish from gum or gum-resins. The ground rubber,
and the varnish distillate, are mixed together-preferably in a cold state-until a thick
mass is obtained in the proportion of about two parts, by weight, of the rubber, to one
of the distillate. This proportion may, however, be varied according to the con-
sistency of the resultant product required.
While I prefer to treat or mix the ground indiarubber with the varnish distillate, I
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page_text: also find that I can substitute therefor, varnish foots, pine oil or thick pine grease,
resin, resinous oils or a mixture of two or more of these, but when employing some of
these, I heat them first to render them more liquid and enable them more easily to
mix with the ground indiarubber.
The mixed mass of the ground indiarubber and the varnish distillate (or other
material used) is heated in a pan or still to a temperature of from about 240° to
300° F., and maintained at that temperature for a considerable time. During this
operation the sulphur in the vulcanised rubber volatilizes and most of it is carried
away in the fumes that pass off during the process, and the rubber gradually
dissolves. The duration of the process may be from 12 to 24 hours, but will to
a great extent depend in the quantity and quality of the material under operation.
For a quantity of about half-a-ton, mixed in the proportions hereinbefore stated.
the operation will be completed in about 12 hours when carried on in a covered
pan or still without pressure.
When the india-rubber is completely dissolved in the varnish distillate or other
material, it is taken out of the pan or still to cool, and solidifies somewhat in the
cooling.
The product is soluble in bisulphide of carbon or other of the solvents now
employed for dissolving pure indiarubber. And it may be used either so dissolved,
for any of the purposes for which a solution of indiarubber is now employed, or
to mix with pure indiarubber for manufacture in the ordinary way.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is
The process of treating or dissolving india-rubber, which consists in mixing it-
in a ground or finely divided state-with varnish distillate, varnish foots, pine oil,
or thick pine grease, resin or resinous oils, and subjecting the mass to a high
temperature in a suitable pan or still, substantially as described.
Y
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.
un mar sath
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