Improvements in Leather-dressing Compositions.
Year: 1896

page_text: Date of Application, 27th June, 1896
Complete Specification Left, 5th Feb., 1897-Accepted, 24th Apr., 1897
PROVISIONAL SPECIFICATION.
Improvements in Leather-dressing Compositions.
DAVID MARCUS 149 Fenchurch Street in the City of London Merchant do
hereby declare the nature of this invention to be as follows:-
A process by which the juice of the rhus vernicifera shall be rendered sufficiently
pliant adhesive, elastic and brilliant so as to enable it to be applied to leather and
other flexible surfaces the essential part of the said process consisting in the
admixture therewith of sulphur and soft solution of india rubber.
Dated this 25th day of June 1896.
DAVID MARCUS.
DAVID MARCUS of 149 Fenchurch Street in the City of London Merchant 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 invention is a process by which the juice of the rhus vernicifera shall be.
rendered sufficiently pliant, adhesive, elastic, and brilliant so as to enable it to be
applied to leather and other flexible surfaces, the essential part of the process
consisting in the admixture therewith of sulphur and soft solution of gutta percha
or india rubber.
Pure gutta percha or pure india rubber may be first rendered into what is
generally known in the india rubber trade as solid or vulcanized india rubber or
gutta percha by the admixture of sulphur in a percentage varying from about two
and a half to ten per cent. according to the degree of toughness desired.
It may
be further toughened by mixing a small quantity of silicate of magnesia, or in
cases where surfaces of a great elasticity are required, pure india rubber only may
be used as a variety, or if a commoner quality is required pure gutta percha only
may be used.
The india rubber or gutta percha so prepared ought to be thoroughly warmed
and mixed in a vessel surrounded by heat, preferably steam, suitable for the purpose.
The inside lining of the vessel should be first coated with an oil such as linseed oil
so as to prevent contact between the contents and the inner lining of the vessel.
When the mixture is reduced into a thick semi-fluid condition it should be
allowed partially to cool, and then the juice of the rhus vernicifera should be
poured into the vessel. The amount of the juice varying from double to twenty
times the amount of the mixture, according to the strength and density of the
varnish required to be produced. The juice will be gradually absorbed or taken
up by the sulphur and gutta percha or india rubber mixture or by the pure gutta
percha or india rubber as the case may be, and when it has thoroughly assimilated
[Rice 8d3

page_text: or eaten its way into the mixture, a varnish is produced ready for use and should
be applied with a wooden or steel spatula or with a brush, on clean smooth
prepared leather, laid flat for the purpose.
The drying of the leather so covered can be best effected in a damp room which
more quickly hardens the juice of the rhus vernicifera contained in the mixture.
Colours for the varnish may be obtained by adding colouring pigments as red
oxide for red brown, vermillion for red, Prussian blue and orpiment for green,
rose pink for purple, etc.
The number of the coatings may be one or more according to the degree of
brightness and depth of hue required but it is advisable that between each coat the
surface should be slightly roughened, in order to make coats firmly adhere.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
The process of rendering the juice of the rhus vernicifera sufficiently pliant,
adhesive, elastic, and brilliant for application to leather and other flexible surfaces,
the said process essentially consisting in the admixture of sulphur and soft solution
of gutta percha or india rubber or as a variety suitable for purposes hereinbefore
described the admixture of pure gutta percha or pure india rubber with the juice
of the rhus vernicifera.
Dated this Fourth day of February One thousand eight hundred and
ninety-seven
DAVID MARCUS.