Improvements relating to Paints suitable for Coating Iron and other Surfaces.
Year: 1895

page_text: Date of Application, 10th Apr., 1895-Accepted, 11th May, 1895
COMPLETE SPECIFICATION.
Improvements relating to Paints suitable for Coating Iron and
other Surfaces.
We, HUGO KOLKER, BRUNO KOLKER, and HUGO NAPHTALI, of the Firm
of Gebrüder Kolker, Manufacturers, of 3, Königsplatz, Breslau, in the Kingdom of
Prussia, 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 :-
Our invention has for its object, to produce a good paint or colouring matter
suitable for coating metallic surfaces, from the tar or residue obtained in the
manufacture of oil- or fat-gas.
For this purpose we subject the said tar to fractional distillation up to a
temperature of 250°, so as to relieve it of all substances which boil at a lower
temperature, and thereby obtain a glossy black product having the consistency of
honey and a higher specific gravity than water. The distillation is preferably
effected by means of hot air conducted into the tar.
The product has the peculiarity, that, unlike the tar from which it is derived, it
can be mixed with liquid hydrocarbons, such as benzene, in fixed proportion only,
and forins an insoluble precipitate, if the said proportions are altered.
It has been found, in practice, that by fractional distillation of the said raw
material, continued up to 250° C., about 11.35 per cent. will be distilled off, and that
the remaining 88.65 per cent. form the glossy black mass mentioned above.
If, for instance, 100 kil. of oil-gas-tar are distilled in a retort over an open
fire, we obtain up to 250° C. 11.35 kilos. of distillate and 88.65 kilos. of the above
described residue.
If these 88.65 kilos. of residue are dissolved by the aid of heat in 45 kilos. of
volatile hydrocarbons, such as benzene and the like, we obtain a mass which is
specially suitable for use as a paint and possesses the following properties.
It dries very rapidly, adheres well, and retains its elasticity, so as not to fall off
or crack in the course of time. It is also easy to handle and possesses great
covering power.
This paint has been found eminently suitable for coating objects which are
exposed to frequent vibrations or shocks.
If applied to iron surfaces, this paint will penetrate through the rust (if any)
and prevent the further oxidation of the iron.
If desired, the paint may be mixed with suitable drying substances or other
admixtures commonly used in the manufacture of paint.
The following is a good example of a paint embodying our invention.
Oil-tar residue treated as described
Benzene
-
-
Drier (oleate of manganese or of lead)
45
88.65 kilos.
kilos.
4.5 kilos.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. The manufacture from oil-gas-tar, of a new product suitable as a base for
paint, which consists in separating from the said tar the substances which boil
below 250° C., substantially as described.

page_text: 2. The manufacture of a paint suitable for coating metallic surfaces, by mixing
the residue of the manufacture of oil-gas, after the substances boiling below 250° C.
have been distilled off, with light hydrocarbons, such as benzene, with or without
the addition of drying substances, substantially as described.
3. As a new article of manufacture, colouring matter or a base for paint 5
composed or produced in the manner substantially as described.
Dated this 10th day of April 1895.
FAIRFAX & WETTER,
433, Strand, London, Agents.