Improvements in Preservative Paints, Pigments, and the like.
Year: 1897

page_text: Date of Application, 1st Feb., 1897
Complete Specification Left, 11th Oct., 1897-Accepted, 15th Jan., 1898
FRUYORUNAL DEVIATION.
Improvements in Preservative Paints, Pigments, and the like.
(A communication from FRANZ FRITSCHE AND COMPANY, Chemical Works in
Hamburg-Uhlenhorst, in the Empire of Germany).
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention to be as
follows:-
The present invention relates to an improved paint which prevents animal and
vegetable growths from forming on the object painted. It has been hitherto
attempted to attain this end by adding poisonous salts of metals or strong organic
bases such for instance as hydrazine to the paint material. The former substances
are however not only not sufficiently effective but in some cases such for instance
as in paint for ship's bottoms quite useless. The organic bases on the other hand
have the disadvantage of being easily decomposed when exposed to the influence of
the atmosphere and therefore can only be efficient for a short time; besides they
become liquid under heat, as in summer and for this reason and also on account of
their high price are not suitable for most commercial purposes.
It has been found that by adding to paint of any kind metanitroparacresol the
desired effect is produced in every respect in the best possible manner. This
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Preservative Paints, Pigments, and the like.
A communication from FRANZ FRITSCHE AND COMPANY, Chemical Works in
Hamburg-Uhlenhorst, in the Empire of Germany).
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in
Improvements in Preservative Paints, Pigments, and the like.
A communication from FRANZ FRITSCHE AND COMPANY, Chemical Works in
Hamburg-Uhlenhorst, in the Empire of Germany).
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in

page_text: what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The present invention relates to an improved paint or coating material which pre-
vents animal and vegetable growths from forming on the object painted. It has been
hitherto attempted to attain this end by adding poisonous salts of metals or strong
organic bases, such for instance as hydrazine to the paint material. The former
substances are, however, not only not sufficiently effective, but in some cases, such
for instance as in paint for ship's bottoms, quite useless. The organic bases, on
the other hand, have the disadvantage of being easily decomposed when exposed
to the influence of the atmosphere and therefore can only be efficient for a short
time; besides, they become liquid under heat, as in summer, and for this reason
and also on account of their high price are not suitable for most commercial
purposes.
It has been found that by adding to paint or coating material of any kind
metanitroparacresol the desired effect is produced in every respect in the best
possible manner. This metanitroparacresol,
(CH. CH. NO, OH) = CH, NO,
(1): (3): (4)
as compared with organic bases has the great advantage of being solid at ordinary
temperatures and of forming, with paint, a quickly drying and solidifying com-
pound, which is inferred to be due to a conversion of the resins and metallic salts
of the paint; moreover it is a substance which does not alter in the presence of air,
so that it is very durable; it is easily and cheaply produced; and its low melting
point enables it to be mixed without any preliminary treatment of the paint, oils
or varnishes with which it is to be mixed; and further, the substance is not acid,
which is of greatest importance in paints for covering the bottoms of iron ships.
In carrying out the invention oxides of metals such as lead, zino, mercury oxides
and other coatings, varnishes or lacquers (benzene or spirit) or the like are employed
for manufacturing the preservative paints. To the paint is added, during the
grinding with the oxides of metals, metanitroparacresol the quantity varying, say,
from 2 to 5%, according to requirements, of the material employed. During the
grinding, and subsequently, a combination of the metanitroparacresol with the
oxides of metals takes place.
The metanitroparacresol may be also combined first with metals, such for
instance as copper, mercury, lead zinc etc. and the metallic compounds thus obtained
added to said coating substances (varnish, lacquer etc.).
Having now particularly described and ascertained the nature of the said
invention, as communicated to me by my foreign correspondents, and in what
manner the same is to be performed, I declare that what I claim is:-
A preservative paint migment varnish or the like formed by adding metanitro-
paracresol to ordinary paint pigment varnish or the like.
Dated this 11th day of October 1897.
BOULT & WADE,
Agents for the Applicant.