An Improved Composition containing Coal-tar, applicable as a Preservative Composition or Cement for Building and other Purposes.
Year: 1891

page_text: Date of Application, 4th Sept., 1891
Complete Specification Left, 9th Dec., 1891-Accepted, 4th June, 1892
PROVISIONAL SPECIFICATION.
An Improved Composition containing Coal-tar, applicable as a
Preservative Composition or Cement for Building and other
Purposes.
I, HEINRICH SEILING, of Ahlen, Westphalia, in the Empire of Germany, Dyer,
do hereby declare the nature of this invention to be as follows:-
Tar has been used for a long time for the preservation of all kinds of building
material, and stone, iron and wood have been protected against atmospheric
influences by a coating of this substance. For stone and wall work, and such like,
which are exposed to the effects of acid fumes a coating of tar is recommended; in
chemical works such coatings are of old established use. And tar has been found
a lasting application also for wood, more particularly wood-tar, which penetrates
more deeply into the pores of the wood than mineral tar, and thereby acts more
effectively.
If, on the other hand, mineral tar is used for coating purposes, it has been noticed
that it evaporates when exposed to the air. If it did not possess this objectionable
property it would be unsurpassed as an anti-fouling medium.
Under this invention a process is provided by means of which it is possible to
entirely deprive the mineral tar of this objectionable property, thus rendering it
most serviceable in the production of a durable paint, which may be considered as
the best anti-fouling medium.
The process consists of the mixing of various mineral salts with the mineral tar,
for instance, copperas, zincvitrol, coppervitrol with white lead, carbonate of zinc,
permanent white, etc. One or more of the mineral salts may be mixed with the
mineral tar as required.
The addition of the salts to the mineral tar is made whilst hot. The product
thus obtained is then mixed with one half its weight of chalk. In place of chalk,
gypsum can also be used, but it is not so suitable.
The prepared mineral tar is applied hot. For painting hard woods it is desirable
to give a previous coating of linseed oil. Before using the prepared mineral tar,
the wood should be saturated with a solution of mineral salts in acid and water.
It is also well to give a double coating. The first coat should be allowed to rest
for some time until well dry, the second can then be applied. As a suitable
material for the second coating the prepared mineral tar is used, but previously
200 grammes of ground chalk have to be added for every kilo.
The nailing of straw, reeds, etc., by means of wires, to posts and other wooden
parts for protection against the weather, can now be done away with. Walls, etc.,
covered with the new paint are more durable and much cheaper than the aforesaid
circumstantial proceedings.
For building, when two or three layers of bricks or stones are cemented with
mineral tar cement, the upper walls are protected against the penetration of
moisture from below, more particularly if the structure is protected from the
outside by a similar coating and then pointed off with ordinary cement.
For painting fences, walls, window sills, barn doors, stables, and in fact for the
most varied building purposes, this paint is of the greatest value.
Dated this 3rd day of September 1891.
CHEESBROUGH & ROYSTON,
15, Water Street, Liverpool, Applicant's Patent Agents.

page_text: COMPLETE SPECIFICATION.
An Improved Composition containing Coal-tar, applicable as a
Preservative Composition or Cement for Building and other
Purposes.
I, HEINRICH SEILING, of Ahlen, Westphalia, in the Empire of Germany, Dyer,
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 way in which you can fabricate such a composition is as follows.
Mingle one kilogram of coal-tar, whilst hot, with one fourth of a litre of thinned
sulphuric acid (15). The product thus obtained is then mixed with from one half
its weight to its full weight of unburnt powdered gypsum, in proportion to the
greater or less consistence of the coal-tar. Use no chalk, because it would make
the acid inefficacious.
This composition has the excellent property of sticking to wet objects, which is
owing to the addition of sulphuric acid.
For building, when the whole foundation-walls or the two or three upper layers
of them only are cemented with it, the walls are protected against the penetration
of dampness from below.
This composition sticking to wood, posts and other wooden parts of buildings can
be directly covered with it. The coating should be allowed to rest for some time
until well dry. Then a coarse plaster of good fresh Portland-cement-mortar can be
applied. As soon as this second coating has grown hard, you can begin with the
ordinary plaster work.
Henceforward, there will be no want of floating of plaster on laths, which is of
very great importance.
For painting tile-roofing in order to make it tight, it is very well to give a
coating of this composition. But it is to be mentioned that in hot weather the
gypsum must bear a far greater proportion than at other times to the coal-tar, in
order to prevent the composition from flowing off. In winter, an enlarged addition
of gypsum can be done without. For, the rays of the sun being not so efficacious,
the composition has a longer time for drying.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is:
To grant me a Patent for an improved composition containing coal-tar, which
can be used for cementing foundation-walls in order to protect the walling against
dampness, as a coating instead of floating of plaster on laths, as a paint to make
tile-roofing tight, and for other purposes.
Dated this 30th day of March 1892.
HEINRICH SEILING.