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Патент USA US2408299

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Patented Sept. 24,, 1946
BITUMINOUS coMrosrrroivs' ‘ "
Richard H. Cubberley, Ridgewood, and Frank W.
.Yeager, Englewo'od, N. J ., assignors to The Pat
‘ cut and Licensing Corporation, New York, N. Y.,
a corporation of Massachusetts _
Ne Drawing. Application May‘11,,1944',1 '
Serial No. 535,194
2 Claims. (01. 260-'—28)
i ‘
V'I‘his invention relates to compositions of nor
mallyls'olid, heat lique?able bitumen, and is more
particularly concerned with the provision of such
5% 'cetyl acetamide ‘will raise thesoftening point
of they asphalt from l50-l60°‘F. to 235-245” F.,'
and, simultaneously, will‘cause theviscosity of
the asphalt at 300°F. to be greatly reduced (1. e.,
compositions having properties and characteris
tics distinctly different from those. originally 5 to 350 C. P. S. at 300° "F.). In addition to this
radical lowering of the viscosity which renders
the asphalt highly ?owable at 300° F., it has been
found that the thus modi?ed asphalt will possess
highheat'stability, as indicated bya sharp sof
wise be unsuitable.
‘One object of the present invention is to pro 10 tening point, ‘and _will not v\?ow ‘or soften to a
vide heat lique?able asphalticcompositions char- ‘ material‘ extent at'temperatures up to approxi-L
mately 10° F. below its adjusted softening point.
acterized by a relatively high softening or melting
Thus, in the example cited, the asphalt, having
point and byv an unusually low viscosity at tem
a softening point of 240° F. will not soften mate
peratures at which an asphalt of similar soften
possessed by the bitumen, whereby to render such
compositions suitable for those types of applica
tions where the bituminous material} would other
ing or melting point is normally-highly viscous.
rially at 225-230° F.
Another object is to provide asphaltic compo
sitions in which the normally high adhesive
strength of the asphalt is modi?ed to a perma
nent, moderate tack.
A further object is to provide heat lique?ablev
asphaltiov compositions which, while possessing
' ‘
The addition of cetyl acetamide to the asphalt
also serves to block out or mask the inherent high
adhesiveproperty. generally characteristic of all
asphaltio'surfaces. The modified asphalt is there
fore suitablefor use as a laminant and coating in
the manufacture‘ of certain types of laminated‘
wrapping materials’ which are'wound into 'rolls
capable of being readily unwound as required for
use.‘ The desirable minimum amount of adhesion
tures up to about .10" F. below the softening point
of the asphalt, will also be ?exibleand non-brittle 25 between‘ layers ‘of the‘ wound wrapping material
at temperatures at which the‘asphalt is normally
that are in direct contact with each other may
high heat stability, 1. e., they will notsoften or
tend toi?ow to any material extent at tempera"
brittle and inflexible.
'The'foregoing and related objects may beat
be termed‘ the ‘_“storage' adhesion” characteristic
of theifnaterial. ‘ It is noteworthy that. the pres
tained, in accordance with the present invention, '
ence' of the cetyl acetamide in the asphalt‘ come‘
- by treating, an asphalt inlsuch manner, as will 30
position does not adversely affect'the desired ad
which render it unsuitable for certain types of
hesion developed when the molten compound is
brought into contact with'the materials that are
to be, saturated and/or coated therewith, and
saturating, coating, adhesive and laminating ap
then allowed to cool.
be more fully explained hereinaftenthat those
properties and characteristics .of the asphalt
plications will be permanently modi?ed to the _
extent required for such applications.
A commercial form of cetyl acetamide, which
is a synthetic wax, is available on the market
under vthe proprietary name of “Acrawax C."
A typical example of an asphalt which may
This synthetic wax has a softening point of
be used in the practice of the present invention
is a grade customarily used in the manufacture ' approximately 280° F. and will increase the sof
of roo?ng shingles and the like.. This-grade of 40 tening point of the foregoing grade of asphalt on
an average of ‘approximately 15° for each 1% of
asphalt may have a softening or melting point of
155°VF.‘, a penetration of 14 at 32° F.',‘36 at ‘77° F._
the material added.
, ,
and '79 at 115° F. Such anasphalt' possessesv a,
The?asphalt composition which has been modi
relatively high viscosity, for example, 680 C‘. R8;
?ed in the vmanner above indicated may also be
at 300° F., and is a very sluggish material, at
rendered flexible‘ and non-brittle at temperatures.
such temperatures‘. Cooled ‘and hardened ?lms
of the order of 0° F. This may be accomplished‘
of ‘this grade of asphalt are extremely brittle and’
by blending with the previously modi?ed asphalt.
composition a small amount of a tacky, viscous
substance which has arelatively high molecular
By ‘adding to a quantity of, the aforementioned 50 weight, ‘and which functions, in part, as a plas
grade of asphalt in heat lique?ed condition a
ticizer for the asphalt._ One example of this type
small proportion by weight of cetyl acetamide,
of substance is a polyisobutylenecompound hav
ing a molecularv weight within the approximate
several’ propertiesand characteristics of the as
phalt are thereby radically altered.‘ It has been,
range of 500-2500. .fSuch compounds are commer
found, for example, that the addition of only
cially available under the trade name of “Vistac.”
in?exible at relatively low temperatures of say _
0° F. and lower. '
The blending with the aforementioned asphalt
composition, for example, of about 10% of Vistac
suitable means. Because of the high softening
point of the compound, the heat-sealed laps de
No. 1 has been found to increase the penetration
of the resulting composition from 15 to 21 at 32°
velop a ?rm bond.
Another practical application for which the
composition of the present invention is particu
larly suited is for coating or lining the interior
F., without however materially affecting the sof
tening point of the composition, viz. 235—245° F.
surfaces of containers or the like which are in
The thus blended composition is ?exible and non
brittle at temperatures as low as approximately
0° F. An unmodi?ed asphalt of a grade having
a similar softening point is characterized by ‘a
penetration of 0-3 at 32° F., and is exceedingly‘
brittle at these low temperatures.
The presence of the Vistac. in the-asphalt com
position also serves to lower the ‘viscosity of.‘ they
resultant composition still further, e. g., from
350 C. P. S. down to 280 C. P. S. at 300° F.
tended to be ?lled with substances at tempera
tures as high as about 10° F. below the softening
point of the composition. In such types of ap
plication, the composition having a softening
point of about 240° F. may be brought to highly
fluid condition by heating it to approximately
?lling ‘the container therewith and
. thereafter‘ removing the excess as by draining,
whereby a substantially uniform coating ?lm of
When the modi?ed asphalt composition con-l - ; the composition remains on the interior surfaces,
which will set and harden upon cooling. The low
taining Vistac is used as a laminant and coating
viscosity characteristic of the composition, even
in the manufacture of wrapping material, the
presence of the Vistac in the composition imparts 20 when it has cooled down to temperatures only
about 20° F. above its softening point, permits the
t0 the Wrapping material a most desirable char
containers to be rapidly ?lled and then rapidly
acteristic. which may be termed “operational
drained with a substantially uniform, continu
tack.” It is this particular characteristic which
ous and relatively thin lining ?lm remaining on
enables a material made with the composition
the interior surfaces of the containers. The de
of the present invention to adhere to itself under
sired interior coating may be obtained, under
moderate manual pressure when applied as a
wrapping around an article and overlapped upon
such ?lling and draining conditions, even where
the containers have interior ?ttings which pre
In order to explain ‘more clearly the unique
sent avnumber of irregular, discontinuous sur
properties of compositions made by modifying 30 faces.
After the coating ?lm has cooled and hard
asphalt in the manner above described, several
practical applications, for which the. composition
ened, the container may be ?lled with the de
sired contents at a temperature as high. as, say
is readily adapted, will be described in detail.
220-230° F. By virtue of the heat stability of
One such application is in the. production of an
the lining, the contents may be poured into the
adhesive wrapping material, wherein a sheet of
container at temperatures as high as about 10°
suitable material, such as woven cotton sheeting,
F. below the softening point of the lining com
kraft paper or the like may be run through a vat
containing the highly ‘fluid composition heated
position without adversely affecting the lining,
to approximately 300° ‘F. When. this sheet
emerges from the vat, a sheet of Cellophane,
kraft paper, metal foil or similar material, which.
has at least its outer surface coated with the
same composition, islaminated thereto by pass“
ing the two layers of. material vbetween a pair of.
combining roll's, which press the layers together -'_
provided that the contents are not. of themselves.
a solvent. for asphalt.
Moreover, the coating provided by the present
composition is quite ?exible, as is indicated by
its relatively high penetration at 32° F., even
though possessing a high softening point, and
The-laminated material is then permitted to cool
slowly while travelling over suitably positioned
is less likely to. shatter or crack, when subjected
to mechanical, shock at temperatures of the or
der of 0° F. than would normally be the case
with an‘ unmodi?ed asphalt of similar high soft
rolls and is then convolutely wound up in rolls
ening point.
and squeeze, out the excess of the composition.
for storage or shipment.
The present composition also posssess other
’ The “storage adhesion” of the wrapping mate
noteworthy characteristics, namely, its chemical
rial‘ made with the composition asabove described
inertness, non-corrosiveness, and resistance to
water. These characteristics, normally inher
ently present in the unmodi?ed asphalt, are pre
served by reason of the selection of modifying
is manifested by the ease with which the ma‘
terial may be unwound from the roll with ap
plication of normal amount of force and without
damage to the material. Had an unmodified
asphalt been used as, the laminant, and coating
inthe manufacture of the above-described ma
agents, such as the synthetic wax and polyiso
butylene above speci?ed, which are themselves
chemically inert, non-corrosive, and water re
terial, the strongly adhesive character of the
asphalt, would‘ have prevented the unwinding of 60
Satisfactory compositions of the present inven
tion may be: prepared using 73-95% asphalt hav
the rolled material without tearing or Otherwise
ing a softening point of approximately 155° F-.,
damaging the material.
2-15% Acrawax C and 13-12% Vistac, these pro
In using the laminated material as an adhesive
portions being by Weight of the compound. Other
wrapper, sheets of su?icientsize are used to pro
vide for an overlapping of the wrapping mate
grades, or types of asphalt, possessing either ap
preciably higher or appreciably lower softening
rial upon itself When placed around an article
being wrapped. The overlapping portions of the
points than the one indicated, may be modi?ed
by combining" therewith the foregoing modifying
wrapping material are brought into contact with
agents in amounts, within the range above speci
each other with the application of'moderate man
um‘ pressure, thus developing “operational tack”
?ed, depending upon the properties of the se
in su?icient degree to hold the overlapping, por
lected» asphalt and upon the requirements of ap
tions together. The wrapped articl‘emay be fur
ther protected‘, if ,desired,yby sealing the, over
There may be thus provided in accordance
lapping portions of the wrapper by the applica
with the invention compositions consisting
tion of heat in any suitable manner and by any 75 mainly of a relatively inexpensive bitumen which
is rendered suitable for many types of applica
tions as saturants, coatings, laminants and ad
2. An adhesive, waterproof composition having
a softening point of 235-245D F. and characterized
hesives for which the bitumen in its unmodi?ed ,
by its high ?uidity at 260-300’ F., heat stability
form is entirely unsuitable.
We claim:
ical inertness, non-corrosiveness, and ?exibility
1. An adhesive, waterproof composition char
acterized by its high ?uidity at a temperature as
position comprising 73-95% asphalt normally
at temperatures as high as about 225° F., chem
at temperatures as low'as about 0° F., said com
having a softening point of approximately 155°
F. and a penetration of about 36 at 77° F., 2-15%
below its softening point, chemical inertness, 10 cetyl acetamide wax and 3—12% of a polyiso
butylene having a molecular weight within the
. non-eorrosiveness, and ?exibility at temperatures
range of approximately 500-2500.
as low as about 0° F., said composition compris
ing '73 to 95% of a normally solid asphalt, 2 to
15% of cetyl acetamide wax, and 3 to 12% of a
polyisobutlyene having a molecular weight is
within the range of approximately 500-2500.
low as 20° F. above its softening point, heat sta- -
bility at temperatures as high as about 10° F.
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