Composition of Matter for Water-proofing Pulp and other Fibrous Articles.
Year: 1891

page_text: Date of Application, 24th Aug., 1891-Accepted, 3rd Oct., 1891
COMPLETE SPECIFICATION.
Composition of Matter for Water-proofing Pulp and other Fibrous
Articles.
I JOSEPH CRAWHALL CHAPMAN of 70 Chancery Lane, in the County of
London, Fellow of the Chartered Institute of Patent Agents, do hereby declare
the nature of this invention which has been communicated to me from abroad by
The United Indurated Fibre Company of Portland in the State of Maine United
States of America, and the manner in which the same is to be performed to be
particularly described and ascertained in and by the following statement :-
My invention relates to a composition of matter for water-proofing pulp articles
to be used in that process wherein the pulp is saturated with an oxidizing com-
pound and then subjected to a high degree of heat, whereby the compound is
oxidized within the pores of the pulp.
Linseed oil has hitherto formed the chief material used for this purpose.
It is
an oxidizing oil well adapted to the process and oxidizes into a hard and tough
gum giving the fibre great strength and toughness. Its high cost, however, has led
to the use of rosin as a means of cheapening the cost of the bath, but when rosin
alone or dissolved naphtha was introduced with the linseed oil it resulted in
rendering the pulp brittle in proportion to the amount used. I have discovered
that rosin may be rendered available for this use and its objectionable qualities
removed by the use of cotton seed oil which, though an oxidizing oil, is oxidized
with such difficulty as to be for practical purposes a non-oxidizing oil. The cotton
seed oil softens up the rosin and frees it from brittleness at the same time becoming
partially oxidized while the linseed oil is present to supply the necessary strength
and toughness.
My invention, therefore, consists of the composition of matter for water-proofing
pulp composed of rosin, linseed oil, and cotton seed oil.
In carrying out my invention I make use of varying proportions according as the
goods require more or less elasticity. As an example, I take sixty per cent. of
rosin which I dissolve for the purpose of facilitating its mixture with the other
ingredients, in thirty per cent. of naphtha, and then add ten per cent. of boiled
linseed oil. To this mixture is added thirty per cent. of crude cotton seed oil, the
mixture is heated to 150° F. and the ware soaked in it. After soaking, the ware is
allowed to stand exposed to the air to remove the bulk of the naphtha and it is
then baked at a temperature of 250° F. until the mixture is thoroughly oxidized
within the body of the pulp. The ware treated with this material is hard and
tough, and is without brittleness incident to the presence of rosin, and at the same
time it is much cheaper than the material hitherto used for this class of work.
Having now particularly described and ascertained the nature of this inven-
tion and the manner in which the same is to be performed I declare that what I
claim is:-
The herein described composition of matter for water-proofing pulp and other
fibrous articles, which consists of a mixture of rosin, linseed oil and cotton seed oil,
substantially as described.
Dated thig 24th day of Avon 1901
J. C. CHAPMAN, C.P.A.