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Patented Sept. 24, 1946
Christopher Luckhaupt, Jamaica, N. Y., assign
or to Luckite 'Processe
s, Inc., Delawanna, N. J .,
a corporation of New Jersey
No Drawing.
Application February 14, 1942.
Serial No. 430,944
,1 Claim. (Cl. mtg-143)
This invention relates to a method of process
practically odorless and tasteless, and for this
ing porous cellulosic materials and to the result-M . reason is .well ?tted for treating containers for
ing product.
’ packing foodstuffs.
One of the objects‘ of my invention is the pro
While the use of terpene dihydrochloride is of
material advantage in many respects other than
those above referred to, I might mention that pre
vision of a process whereby porous cellulosic ma
terials may be treated to increase or enhance
the tensile strength, ?exural strength and com
formed articles of porous cellulosic material may
pressional strength thereof. Provision is made
be \treated without warping, swelling or other
also in the present invention for the incorpora
wise distorting the preformed article.
tion in the base treating material of certain sub 10
While terpene dihydrochloride in itself, as
stances to be hereinafter referred to as “forti?ers”'
above pointed out, is insoluble in water, the
whereby the properties imparted to the porous
waterproofness of a cellulose material processed
cellulosic material by the base material are fur
this base material may be further increased
ther enhanced and‘ other properties incorpo
by'adding forti?ers such as vegetable oils and
15 mineral oils, raw and blown, fatty acids. cetyl
More speci?cally the present invention pro
alcohol, etc. These forti?ers‘are added to the
vides for the processing of porous cellulosic and
heated terpene dihydrochloride.
kindred material whereby‘ the same becomes
The cellulose being processed may be rendered
waterproof, ?ameproof, oilproof and rotproof. I
highly ?ameproof and ?re-resistant by adding to
am also able to impart ‘hardness, strength and‘ 20 the meltedv dihydrochloride fo'rti?ers such as
elasticity to the cellulosic material and to convert
,acetic acid, citric acid,_butyl phosphate, choles
the same as well into a good electrical insulating
terol, etc.
material meeting all the requirements of the ?re
It is sometimes desirable to prevent the oxida
of the material processed and to prevent it
Still moreyspeci?cally the present invention 25 tion
from drying out and becoming brittle, and in
provides for the treatment of porous cellulosic
such event 'I add fortifiers‘ such as parachloro
material and kindred material with terpene di
phenol, diethyl phthalate, dimethyl' phthalate,
hydrochloride C1oH1s.2HC1. This material is
castor oil, etc. to the melted terpene dihydro
made from limonene (C10H1s) in glacial acetic
acid by HCl gas or from terpin and HCl gas. It
is a white to yellowish white crystal melting at‘ _
50° 0. (122°' F). It is insoluble in water and is
practically odorless and tasteless. The cellulosic
The oilproofness of the processed material may
be enhanced by the incorporation into the melted
terpene dihydrochlor-ide of fortiflers such as
cellulose acetate, glycerophosphate, etc.
material may'be immersed in a hot bath of the
Cellulose acetate also possesses the propertyof
terpene dihydrochloride'in an open. container, the 35 increasing
the hardness and strength of a cellu
employment of vacuum or ‘pressure being un
losic material processed in ‘accordance with my
necessary to the successful practice of my inven
invention. Forti?ers such as resin, indene resin,
tion. ' The terpene dihydrochloride during proc
etc. may be used also to increase the hardness of
essing is kept at its melting temperature or
the resulting product, while ethyl cellulose and
higher. The period of immersion is“ dependent, 40 butyl cellulose are further examples of forti?ers
of course, upon the degree of penetration desired,
useful in increasing the strength of the resulting
but in any event is only a matter of seconds.
My invention may be practiced by spraying or
by coating in an ordinary roller coating machine.
Where an increase in adhesiveness is desired,
forti?ers such as‘ resin, indene resin, linseed oil,
I ?nd that terpene dihydrochloride is particu 46 rape seed oil, etc. may be used.
larly advantageous when treating porous cellu
The cellulosic material, being processed may
losic material containing low melting point ma‘
be rendered rot-proof by ‘the use of fortiflers
terials which are to be preserved, in, that the _ such as‘ sodium ?uoride, dinitrophenol cromate,
terpene dihydrochloride has a low melting point.
etc., while the elasticity of the ?nished product is
This fact too is of material advantage where ?ex 50 much enhanced by the incorporation of vegetable
ibility of the processed material is to be pre
and mineral oils.
served, cellulosic material processed with ter
Marked improvement is obtained in the insu
pene dihydrochloride remaining, ?exible at. low
_' temperatures.
My base material, terpene'dihydrochloride, is
lation value of the processed cellulosic material‘,
and an article produced capable of meeting theZ 1 ~
?re underwriters’ requirements by adding for-ti ‘
. ' 2,467,9ae
being processed. ' I have found from a great many _
acetate and ethyl cellulose to the hot terpene di
tests that the, i’ortitlers may vary in quantity
hers ‘such as: chlorinated waxes, latex, cellulose
.from 2 to 75%" by weight of the terpene dihy
droehloride. As a general rule the more iorti?er
-I ?nd that articles of porous cellulosic mate
employed‘ the greater the. degree of the characteristic orproperty of that particular forti?er im
parted to the cellulosic material'or kindred ma
rial processed in accordance with this invention
have their pores and interstices ?lled with the
treating material in solid form, leaving a smooth
terial being processed.
. .
surface on the processed material. This surface
It is to be understood that cellulose sheets, for
need only be sanded to ?t the same for painting,
shellacking, varnishing, etc., it such ?nishes are 10 example, may be processed and afterward fabri
cated into any article desired, although. as above
desired. Should it be desired to'coat as well as mentioned, there is‘ no change, shrinking or swell
to impregnate the cellulosic material, this can be
ing or warping of preformed articles processed in
done by lowering the temperature of the treating
accordance with my invention.
' The terpene dihydrochloride and forti?ers can
material after initial processing.
Porous celluloslc material and kindred mate
be added to comminuted cellulosic material so
that the admixture may be employed as a mould
ing powder. If a thermoplastic is desired then
forti?ers such as cellulose acetate and triphenyl
' rials treated in accordance with this invention
may be sawed, bored, planed and shaped without
jagged edges or leased surfaces and without
cracking or checking of the material.
As above pointed out, the processing period 20 phosphate may be used. . If the powder is to ‘be
thermo-setting then I suggest latex and sulphur.
While I have described my invention with re!’
renece to certain forti?ers, etc., it is to be under
stood that'changes and modi?cations may be
made within the purview of my invention.
varies with the degree of penetration desired. As
a general rule the processing period depends upon
the temperature of the treating material and the
degree of penetration desired. In all cases, how
ever, impregnation ls- almost instantaneous, be
im; only a matter off a few seconds.
What I claim is:
The method which comprises impregnating
_ I think it will be appreciated that it is not
possible to name a speci?c amount of a given
porous cellulosic material by immersing the same
in a mixture of terpene dihydrochloride and-cel
forti?er which must be employed in all cases.
The ratio of forti?er to terpene dihydrochloride 30 lulose acetate heated to a temperature at or above
the melting temperature of the terpene ' dihy
necessarily varies over a wide range, and is de
pendent upon thedegree to which a particular
- characteristic is to be imparted to the material
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