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Патент USA US2105623

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Jan.‘ 18, 1938.
w. J. \IIAN ROSSEM
2,105,623
FLEXIBLE PACKAGE FUR HYDROCOLLOID IMPRESSION MATERIALS
Filed Jul-y 26, 1937
'INVENTOR.
WMRMI,
Hawk/41.94‘ aw!!!
ATTORNEYS
2,105,623
atented Jan. 18, 1938
S’ ATES
OFFICE
I 2,105,623
FLELE‘ PACKAGE ron mmnocouom
IMPRESSION MATERIALS
Walter
van Rossem, West Los Angeles, Calif"
assignor to Surg'ident, Ltd., Los Angeles, Calif.,
a corporation of California
Application July 26, 1937; Serial No. 155,721
8 Claims.
(Cl. 206-46)
This invention relates to an advantageous pack
readily capable of elastic deformation at ele
agein which a plastic moisture-containing im-n
vated temperatures whereby the packages may be
pression compound may be stored or marketed. I
immersed in water and heated to render the con-‘
tained material ?uent after which the package
may be kneaded, if desired, to homogenize the
.This application is a continuation-in-part of
5 my copending application Serial No. 57,397, ?led
January 3, 1936.
V
One of the important objects of the invention
is to provide a package which may be easily and
cheaply prepared and which will preserve a hy
_10 drocolloid' or other moisture-containing mate
rial without loss of moistureiior an inde?nite
material and render the same suitable for use,
without danger of rupture during the kneading
operation.
Further objects and advantages of the inven
tion will either be speci?cally brought out in the 10
following description or will be apparent there
period.
from.
A further important object of the invention is
to provide a package of the‘ character described
vention in the accompanying drawing, and re
15 which will preserve a moisture-containing mate
rial against-moisture loss in storage and which
' will be resilient and capable of elastic deforma
tion, without losing its ability to preserve the
moisture-containing material, at temperatures
2% adjacent or in the'neighborhood of the boiling
point of water.
'
A particular object of the invention is to pro
vide a package of the type described, having, a
projecting thread-like member embedded in the
25 hydrocolloid or other moisture-containing mate
rial, to aid in the formation of the package and
in subsequent handling thereof.
,. '
The package of the present invention is pri
marily adapted for enclosing dental impression
1
- I have illustrated packages embodying my in
ferring thereto:
,
.
15
Fig. 1- is a side elevation of ‘a body of material
surrounded with an envelope of moisture im
pervious material and provided with a thread
like member; the envelope is shown in sectional
elevation and a- portion of the body of material 20
at the upper end thereof has been broken away
to show the attachment of the thread-like mem
ber to the body of material;
_
‘
Fig. 2 is a perspective view thereof;
7
Fig. 3 is a view corresponding to Fig. 1, showing 25
a modi?ed type of thread-like member; and
.
Fig. 4 is a side elevation of a further modi?ed .
form of package.
The coating material is preferably one which,
even at the elevated temperatures at which the 30
talning reversible hydrocolloid base. These ma . contained impression material is handled to ren
terials are in general‘ semi-rigid when cool and der the same ?uent, retains a high degree of me
must be heated to render the same ?uent for use. chanical strength, and preferably also remains
Compositions of this‘ general type are described substantially moisture-impervious. The coating
35 in U. S. Patent No.‘ 1,672,776-and in the two U. S. material is also preferably one having a rela- 35
.30 materials or compositions having a moisture-con
patents to Laurence E. Harrison, Nos. 2,021,058
and 2,020,311.
_
'
p
- ‘The package of this invention comprises in
_
general, a body of moisture-containing hydro
40 colloid material which is adapted to become plas
tic upon heating, enclosed by an envelope of
moisture impervious material. A threadlike
member is secured to the package and extends
outwardly thereof to facilitate handling of the
package. -The term “thread-like member” is
meant to include a wire, a fabric thread, or any
other suitable thread-like member, as will be
apparent as the description proceeds. I prefer to
utilize a substantially continuous moisture-im
' 50, pervious envelope coating for a body of . such im
pression material which adequately protects the
material from contamination and preserves the
moisture content of the material, such envelope
coating being of a material which is of high me
55 chanical strength at ordinary temperatures but
tively high mechanical strength at ordinary tem
peratures, a melting point somewhat in excess of
100° C. and relatively resilient and capable of
elastic deformation at temperatures in the neigh
borhood of 100° C. The ability of the material to 40
elastically deform at the high temperatures
should persist to an important degree during 0001- '
ing 'from adjacent 100° C. to in the neighborhood
of 35° to 40° C., as it is common practice in dental
technique to continue the kneading of the heated
5
composition until the; temperature thereof has
dropped to a point such that it may be inserted
within the mouth of a patient without undue dis
comfort. Numerous compositions are available, 50
for the fabrication of this envelope, such as the
vinyl resins, among which may be listed the com
mercially available “Koroseal” which has'a melt
ing point slightly below 140° C., or combination
solutions of cellulosic compounds and a moisture- 55
2
2,105,838@
proo?ng material such as rubber, resins, resinous
gums, and high melting point waxes.
body I. A loop 8 may be advantageously formed
As a specific example. of a coating material
which may be employed, I may take two separate
in the other endlof the wire or thread-like mem
ber to' facilitate handling thereof so that the
packages may be hung on a peg or so that other
equal volumes of hexalin (hexa-hydro-phenol),
dissolve from 10 to 30% by weight of celluloid in
one of the volumes and from 10 to 80%by weight
of raw rubber in the other of said volumes, and
at e.
threads may be attached thereto. The package
is shown dipped so that the envelope material
completely surrounds the thread-like member as
'
then intermix the two volumes to form a com
A further modi?ed form of package is illus
10 posite solution which may, if desired, be evap
' orated to a honey-like consistency.
trated in Fig. 4 in which a stick of material indi
Alternatively, an unloaded vulcanized rubber
may be incorporated in the coating material, in
which case I preferably employ ‘a solvent such as
15 hexalin acetate (cyclohexanol acetate), which
provides somewhat better intersolution of cellu
loid and vulcanized rubber than does the alcohol
hexalin itself. Substantially the same propor~
tions may be employed as are above set forth, and
the solutions may be more rapidly prepared by
heating (preferably to a temperature below the
?ash-point of the solvent if carried out in the
'20
to form a partial coating for a length such as
indicated by the bracket l2. A thread-like mem
ber l3 such as a wire or fabric cord may then be
held against the coated portion l2 and allowed to
lie against the uncoated portion of the stick as at
H. rPhe stick may then be clipped to form a
coating extending for the length indicated by the
bracket IS. The coating l5 covers the lower
dotted portion of the thread-like member is and 20
secures said member to the envelope in the por
tion of the envelope where the coatings I 2 and -
open, or to a higher temperature under re?ux
l5 overlap.
condensationl.
envelope for the abovedescrlbed moisture-con
It will be appreciated that it ‘may facilitate the
procedure if the lower end “I of the thread I3 is 25
temporarily secured to the stick H before the
coating is ‘is applied so that the member I3 will
molding or the like, inserting a thread-like mem
into the stick of material or by wrapping the same
Any of the above materials, such as “Koroseal”,
25
10
cated at I I may be grasped by one end and dipped
for example, may be used to form a continuous
taining hydrocolloid impression compound, as by stay in position adjacent the stick II during dip
forming a cylindrical or other suitably shaped ping. This may be accomplished by pressing the
30 body of such hydrocolloid compound by extrusion, lower portion Id of the thread l3 a short distance
her into one end of the cylinder and then dipéx about the stick. '
It will also be appreciated that it may be ad
ping the cylinder into one of the above described
solutions, withdrawing the dipped cylinder and ' vantageous to pre-dip the thread-like members
allowing the coating to dry.
7
_
Thus in'Fig. 1 a body of hydrocolloid material
is indicated at I and provided with a thread-like
‘ member 2 such as a ?ne wire or fabric thread
which has been knotted or otherwise provided
40 with an enlarged portion 3 and inserted in one
end of the stick of material I. The stick of ma
terial may be carried by the member 2 and dipped
into a bath of envelope material such as “Koro
seal” to form an envelope coating indicated at 4.
The completed package is shown in perspective in
Fig. 2.
.,
Thethread-like member will then be secured
to the body or stick and will extend through the
envelope to facilitate handling of the package.
50 The package may be formed by one or more dip
- pings in this manner and the thread-like mem
ber will be secured to the envelope by the natural
. shrinkage of the envelope material and the pack
age will be substantially moisture impervious.
55
I prefer, however, to form the package by a
double dipping procedure, as by holding the stick
I by the thread-like member 2 ‘and immersing
it somewhat over one-half its length, allowing the
coating to congeal and then inverting the stick
and dipping the end to which the thread-like
member is attached, so that the two coatings
overlap to form a moisture impervious envelope.
When a fabric thread or a very ?ne wire is used
as the thread-like member it is di?icult to ob
65 tain the second dip since the thread is dl?lcult to
submerge due to its ?exibility and also because
it is liable to become attached to the side of the
envelope.
’
'
To overcome. these disadvantages when the
70 double-dipping procedure is followed, I prefer to
' use a relatively stl? wire forjth'e thread-like mem
her. Referring to Fig. 3, the body I is shown pro
vided with a thread-like member 6, such as a rela
tively stiff wire, having an end 1, formed as a
75 corkscrew or otherwise enlarged, secured to the
before using them in the fabrication of the pack
age.
It should also be noted that the thread-like
member may be attached to the outside of the
package, in which case it does not extend into the
envelope, without departing from the spirit of this
invention. Furthermore, it will be appreciated 4%
that a plurality of thread-like members may be
provided, which may, if desired, be interlaced and
used to support the hydrocolloid stick during the
dipping operation, and contributing to some
degree to the strength of the packagecoating.
It will also be appreciated that the thread-like
member may be considered to extend through the
envelope which covers the stick of material in
Figs. 1-4, even though an additional coating of
envelope material is shown at 9 on the member 6
in Fig. 3. Where an absorbent thread-like mem
ber is employed, the coating material will pene
trate the body of the member, effecting a seal
against capillary loss of moisture through the
member.
’
-
The portion of the string or wire which re
mains within the body of the material will pre
sent no di?iculty in the subsequent use of the
material inasmuch as such material is rendered
?uent by immersion in a heated ?uid such as
water and subsequently extruded from the pack
age after slitting or cutting the same at one end.
The thread-like member attached to the package
facilitates subsequent handling thereof during
the heating operation which is carried out to 65
render the contained material ?uent. For ex
ample,_if the string or wire is of such length as to
. extend 8 to 12 inches from the package, it may
be allowed to extend exteriorly of the water bath
in which the package is being heated, whereby
the package may be withdrawn‘from the bath
through the medium of such string without the
operator burning his ?ngers, or, in the case of the
looped construction shown in Fig. 3, a forceps or
the like may be employed to engage the loop even
2,105,628
‘though it projects from the‘ package for
shortv distance.
but a
_
It should also be noted that since the hydro~
colloid materials with which the present disclo
sure is concerned are fairly conductive electri- \
cally, due to the presence of sodium sulphate,
alum or the like, the wire 6 may be used to supply
an anodic deposit from a colloidal rubber disper
sion to produce a rubber coating thereon.
10
I do not choose to be limited to the speci?c
coating materials herein set forth in the prepara
tion of the envelope of the present invention, as
there are numerous other coating materials
3
4. A package as set forth in claim 2, said
thread-Like member being secured to said enve
lope and forming a substantially moisture-imper- '
vious joint therewith.
5. A moisture-impervious package comprising
a body of moisture-containing hydrocolloid ma
terial adapted to become plastic upon heating,
an enclosing envelope of moisture-impervious
material surrounding said body, and a knotted
thread-like member embedded in said body and
held in engagement therewith by said knot and
extending through said envelope to facilitate
which will provide the described moisture-reten
handling of such package. '
tically deformable at temperatures adjacent to
a body of moisture-containing hydrocolloid ma lo
terial adapted to become plastic upon heating,
6. A moisture-impervious package comprising
15 tive envelope having, the property of being elas
or in the neighborhood of the boiling point of
water and which will give the desired seal between - a thread-like member secured. to said body and,
the thread-like member and the envelope to pre
extending outwardly thereof for facilitating the
vent undue moisture loss.
‘
vhandling of said package, and an envelope of 20
I claim:
,
_1. A moisture-impervious package comprising
a body of moisture-containing hydrocolloid ma
terial adapted to become plastic upon heating,
an enclosing envelope of moisture-impervious
material surrounding said body, and a thread
like member secured to said package and extend
ing therefrom‘ to facilitate handling -of such
package.
-
moisture-impervious material surrounding said
body and in engagement with said thread-like
member to provide a moisture-impervious enclo
sure for said body. I
'
7. The package set forth in claim 6, said 25
thread-like member ‘comprising a thin metallic
wire.
8. A moisture-impervious package comprising
2. A moisture-impervious package comprising
a body of moisture-containing hydrocolloid ma-,
a body of moisture-containing hydrocolloid ma
terial adapted to become plastic upon heating, an
terial adapted to become plastic upon heating, a
plurality of thread-like members engaging said
enclosing envelope'of moisture-impervious mate-_
body and at least one of said members extending
rial surrounding said body, and a thread-like
member secured to said body and extending
outwardly thereof for facilitating the handling of
said package, and an envelope of moisture-imper-, 35
vious material surrounding said body in engage
such package.
'
ment with said at least one thread-like member
3. A ‘package as set forth in claim 2, said _ and providing a moisture-impervious enclosure
thread-like member also being secured to said for said body.
~
‘
through said envelope to facilitate handling of
40 envelope.
,
-
'
WALTER J. van ROSSEM.
40
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