Improvements in the Preparation of Oxide of Zino Pigments.
Year: 1893

page_text: Date of Application, 7th Mar., 1893
Complete Specification Left, 28th Nov., 1893-Accepted, 13th Jan., 1884
PROVISIONAL SPECIFICATION.
Improvements in the Preparation of Oxide of Zino Pigments.
ARTHUR PILLANS LAURIE of 49 Beaumont Square London E. Lecturer on
Chemistry, do hereby declare the nature of this invention to be as follows :-
I grind pigments containing zinc oxide or other metallic oxide or oxides or
salts of metals with a mixture of oil, and a free fatty acid or acids, such as
linoleic acid, or with a free fatty acid or acids alone, with the result that a soap
is formed by the fatty acid or acids, and the metallic oxide or oxides or salts, and
the pigment improved in consistency and quality. The free fatty acid or acids
may be added to the oil, or formed in the oil, by blowing through superheated steam
or by other methods.
ALL 1000
ARTHUR PILLANS LAURIE.
COMPLETE SPECIFICATION.
Improvements in the Preparation of Oxide of Zinc Pigments.
I, ARTHUR PILLANS LAURIE of 49 Beaumont Square, London E. Lecturer on
Chemistry do hereby declare the nature of my invention and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement :-
"
My invention has for its object to improve the consistency and quality of oxide
of zinc pigments. To effect this I grind the said pigments with a mixture of oil
and a free fatty acid, or free fatty acids, which will combine with the oxide of
zino, such as thoso free fatty acids which are derived from linseed oil or olive oil
such as linoleic acid or oleic acid and free fatty acids allied thereto. A soap is
thus formed by the free fatty acid, or free fatty acids, and the oxide of zino or part
thereof and the pigment is improved in consistency and quality. The froo fatty
acid, or free fatty acids, may be added to the oil to bo used in grinding the pigment,
or the said acid, or acids, may be formed in the said oil by any suitable means, such
as by blowing superheated steam through the oil, or the free fatty acid, or free
fatty acids, can if desired, be added and thoroughly incorporated after the oxide of
zinc pigment is mixed with oil.
My invention can be employed for the preparation of pigments generally which
are composed of, or contain, oxide of zinc. I instance the pigment known as
Freeman's white, which consists of sulphate of lead and oxide of zinc, as one to
which my invention can be applied with considerable advantage.
A suitablo proportion of free fatty acid, or free fatty acids is from five to
fifteen per cent. of the oil used in grinding, five per cent. being generally sufficient
for the preparation of pigments for house painters' use and fifteen per cent. being
more suitable for the preparation of pigments for artists' use.
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 :-
In the preparation of pigments consisting of, or containing oxide of zino, the

page_text: added as such to the paint, or to the oil to be used in grinding, or be formed in
the said oil, as hereinbefore explained.
Dated this 28th day of November 1893.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.Ć., Agenta.