Improved Process for the Preparation of a Coating of Indiarubber on the Surface of Waterproof Bed-sheets.
Year: 1899

page_text: Date of Application, 8th Dec., 1899-Accepted, 24th Feb., 1900
n Improved Process for the Preparation of a Coating of Indiarubber
on the Surface of Waterproof Bed-sheets.
communication to me from JOHANN MINDER, of Mynski Kladbischa, Moscow,
in the Empire of Russia, Indiarubber Manufacturer.
I, EDMUND EDWARDS, of the Firm of Edwards and Co., Chartered Patent
Agents & Engineers, of 65 & 66, Chancery Lane, in the County of Middlesex, 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:-
The indiarubber coated bed sheet materials heretofore used are not only stiff
and hard, but are also on account of the fine pores of the indiarubber coating-
especially difficult to disinfect, and require therefore the greatest care in using
them in cases of illness.
The improved process which forms the subject of the present invention consists
in a process which entirely gets over this difficulty in the indiarubber coating, so
that by it a soft, completely impervious material for bed sheets is obtained,
capable also of resisting acids and alkalies.
The new process consists essentially in adding heavy hydrocarbon oil, such as
mineral oil, tar oil, ozokerit, or paraffin, to the usual mixture of indiarubber,
dyeing and other material, before the solution in benzine or benzol; and after
the usual processes of coating, drying, and vulcanizing, passing the material
through a solution of heavier hydrocarbon oil in benzine or benzol, and then
drying it.
The addition of heavy hydrocarbon to the mixture of indiarubber, and other
material and colouring matter, in the proportion of about one-fifteenth to one-
twentieth of the weight of the latter, considerably facilitates the mixture of the
materials, and surrounds the molecules of the indiarubber after the solution of
the mixture in benzine or benzol with a completely neutral coating, unaffected
5 by chemical influence.
The object of the treatment of the vulcanized coating with a solution of heavy
hydrocarbon in benzine or benzol in the proportion of about one to twelve, is to
get rid of the very fine pores in the coating, and at the same time to make the
coating and also the bed sheet prepared with it as described, soft and pliant
30 It is also ensured in this way that no micro-organisms shall remain present in
the material.
35
Having now particularly described and ascertained the nature of the sai
invention, and in what manner the same is to be performed, I declare that wha
I claim is:
A process for the preparation of an indiarubber coating for the material of be
maisting in adding heary hydrocarbon to the mixture of indiarubbe

page_text: colouring and other usual materials, before the solution in benzine or benzol, and
after vulcanizing this coating, passing it through a solution of heavy hydro-
carbon in benzine or benzol, and then drying it, substantially as described.
Dated this 8th day of December 1899.
EDWARDS AND Co.,
Chartered Patent Agents,
65 and 66, Chancery Lane, London, Agents for the Applicant.