Improvements in Compositions or Compounds for Removing Paint.
Year: 1896

page_text: Date of Application, 25th Feb., 1896-Accepted, 28th Mar., 1896
COMPLETE SPECIFICATION.
Improvements in Compositions or Compounds for Removing Paint.
A communication by CHARLES STUART BAILEY, of St. Augustine, in the County of
John and State of Florida, United States of America, Chemist.
1, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for Foreign
Patent Solicitors, 6 Lord Street, Liverpool, and 6, Bank Street, Manchester, both
in the County of Lancaster, 118 New Street, Birmingham in the County of
Warwick and 31 High Holborn in the County of Middlesex, Civil Engineer, 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 an improvement in composition of matter for removing
paint, and the object is to provide a chemical composition, which will, without the
aid of heat, act rapidly and at the same time effectively, in loosening paint,
irrespective of its hardness and of the number of coats, without injury to the wood
or other articles on which the paint is located. By this invention, the common
method of removing paint by burning is superseded, and it has the advantage of
leaving the wood in a better condition for repainting.
With this end in view, the invention consists in a mixture of the following
ingredients, namely:-Calcium sulphuret, calcium oxide, barium oxide, arsenious
acid and soda ash, united in suitable proportions with sufficient water to make a
stiff paste.
These ingredients are hoiled together and ground down to a fine state of
subdivision.
While different proportions might be used, it is found that the following give
excellent results, namely:-
Calcium sulphuret
Calcium oxide
Barium oxide
Arsenious acid
Soda ash-
10 parts.
40
"
16
"
-
10
"
24
"
These are mixed with water, and starch, gumcatechu or other vegetable matter
added to act mechanically in preventing sediment.
In order to give the composition a particularly severe test, Mr. Bailey has
applied it experimentally to railway carriages, because they are always exceptionally
well and carefully painted, as well as varnished, and he has found that it required
only an hour to soften the four coats of paint and three coats of varnish to which
such vehicles are usually subjected. After covering the surface to be cleaned with
the composition and allowing it to stand for about an hour, he found that both
the composition and paint came off together, by scraping with a painter's knife
and washing with water, and when the cleaned surface was dry, by brushing off
with a dry brush, the wood, iron or other material so treated was found in perfect
condition for repainting.
The action of the composition is perfectly under the control of the skilled
operator, by adjusting its strength by the addition of water and regulating the
time which it is allowed to remain in contact with the paint. By this means,
either the varnish alone, or the varnish and any desired number of coats of paint
can be removed.

page_text: It is evident that slight changes might be resorted to in the proportions used,
and hence the invention is not limited to the exact composition herein set forth.
Having now particularly described and ascertained the nature of the said invention
and in what minner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is :-
1. A composition of matter for removing paint, consisting of calcium sulphuret,
calcium oxide, barium oxide, arsenious acid and soda ash, mixed with water.
2. A composition of matter for removing paint, consisting of calcium sulphuret,
calcium oxide, barium oxide, arsenious acid and soda ash, mixed with vegetable
matter to act mechanically to prevent sediment, substantially as set forth.
Dated this 24th day of February 1896.
WM. P. THOMPSON & Co.,
Agents.