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Патент USA US2120379

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June I 14, 1938;
R. s. TAYLOR e-rm.
, '
Original Filed Nov. 16, 1932
ROBERT M ?NZ/ijjf?
%. .'
attorney: ‘
{PM June is, less’
A ‘ 2,120,319
Rum-i amimrnmpiia'rmeemw
ormmu am November 16, 193:, ‘mu
No. mas. Divided and this application May
18, 1934, Sub! No. 728,316
4 Claim.-
(Ol. 152-347) .
This invention relates to-inner tubes, and more tion, and a layer H of sticky, unvulcanised plastic
especially it relates to puncture-proof inner tubes rubber composition on the inside of the tube so
for pneumatic tires or other in?atable bodies.
disposed as to cover substantially the outer pe~
The improved inner tube is of 'the type that ripheral half of the tube.
comprises puncture-sealing composition in its
The sticky layer I I is composed of rubber com
structure as distinguished from the compression position that has been softened and made plastic
type of puncture-closing tube,‘and the chief ob
by a chemical agent in the presence of heat dur
‘jects of the invention are to provide a puncture
\ ing the vulcanizing of the tube proper. Before
proof inner tube having improved puncture; 7 being heated the composition has the same phys
sealing composition incorporated in its structure; ical characteristics as ordinarily unvulcanized
to reduce the weight of tubes of the character rubber‘composition, being‘semi-plastic and only
mentioned; to provide improved puncture-sealing slightly tacky, and easily'worked. Thus it is a
properties in the tube; and to provide an improved simple matter to incorporate the layer II in the
method of making the tube that willresult in tube structure during the fabrication thereof.
and facility of manufacture, andgrediice ,
15 economy
the cost of the tube.
A salient feature of the inner tube of the in
vention is the‘ elimination of the inner layer of
vulcanized rubber or other material covering the
plastic puncture-sealing compound. An im
portant advantage of the novel method devised
is the utilization of a sealing layer which is not
excessively tacky or plastic during the manufac
The following formula for the layer I I has been
found to give satisfactory results.
,Per cent
Phosphoric acid __, _____________________ __
Rosin oil
The particular softening chemical agent used
is ortho ‘phosphoric acid (HaPOd :.H2O of 85%
turing and assembling stages, but which acquires strength.
The clay serves as a vehicle for the
these characteristics upon being subjected to heat‘
acid, the clay and acid being mixed
at vulcanizing temperatures,as contrasted with together before
being added to the other in
the prior art methods in which the puncture
sealing layer is very tacky during the entire manu
facturing process.
This application is a division of our copending
application Serial No; 642,834 ?ied-November 16,
. Of the accompanying drawing:
‘ -
Figure 1 is a fragmentary side elevation of the
fabricated inner tube, a part thereof being broken
away and in section;
' Figure 2 is a section on th'e'line 2-2 ofl'igure 1;
Figure 3' is a fragmentary transverse section
I. ontheiineS-SofPigurel;
The rosin oil serves as a softener and tack
producer, and its use here is typical of many'
rubber compounds. The several ingredients'are 30
mixed on a'rubber mill in the usual manner.
the mixture havingthe physical characteristics
of normal compounded rubber stock. It may be
calendered into sheets and silt into strips for
‘use in building inner tubes.
In the structure shown in Figure -1 the layer
I l covers the outer peripheral half of the body »
structure, which is the tread portion of the tube.
the‘ Preferably the layer ll consists of two piles of 40
inner tube therein. showing the action of the tube lib, Figures 1 and 2. A non-tacky plastic layer
Figure 4 is a fragmentary detail section
tread of a pneumatic tire having‘ the improved ‘ the non-vulcanizing stock, as is shown at HP,
constituents when pierced by a
is provided 0 the tube as by coating with a thin
or the like; ' film of lacqu r, paint, varnish, plasticlzed gelatin‘
‘ the action of the tube as the nail'is withdrawn.
Referringto the. drawing. particularly Figure
‘or glue, orvcotton flock. This layer prevents the
walls from adhering \to each other during the 45
finishing processes and during the packing, ship
3 thereof, it will be seen that the improved‘ inner
tubes comprises an annular. tubular structure III
ping and use of the tube. A suitable valve stem‘
of‘ the usual elastic vulcanized rubber composi
the vulcanization ‘of; the body structure ‘II, but
"is mounted in the tube.
The application or heat to the tube results in
V the layer ll, due to the presence of ‘the chemical" , I come permanently tacky‘ 'and'plastic upon being
‘agent and absence of sulphur, accelerator or other , subjected to heat at vulcanizing temperatures
vulcanizing ingredients in its composition; 'does and'may therefore be used in compounding layer
1 I. The following is a representative list of these
not-vuicanize. 0n the contrary the layer ll be
[comes extremely plastic, almost viscous in form,
and interiorly is very sticky. Although the non _j Sulphuric acid
'- tacky'layer in the tube causes the surface of layer .Chromic acid
1 ll to'besomewhat less sticky sothat it willnot
Di-sodium hos hate
Stannous e lo de
Furoic acid
Para toluene sulphonic acid
Chloro sulphonic acid
Phosphorus pentoxide
- , Phthalie anhydride
'adhere to the opposite wall of the tube should it - Potassium
Mono-sodium phosphate
orlc acid
' -10
come in contact therewith, it is preferable that Meta-phosp
Phosphorus acid
Arsenic acid
Copper sulphate
Boric acid
the ?nished'tube be kept in lightly in?ated con
Lead peroxide
" dition.
resorted to with
' The action of thetube in service is illustrated, v Other modifications may
in Figures 4 and 5 wherein 20 designates the out departing from the spirit of the invention
tread portion of a pneumatic tire casing within , or the scope of the appended claims, which are 15
which the tube is mounted, and 2| designates a not limited wholly to the specific construction
nail or tack that has penetrated the tire tread‘ shown or exact procedure described.
and tube, thus passing through the sticky .layer
What is claimed is:
1. An inner tube comprising an annular tu
ll of the latter. The sticky stock ll adheres ‘
.7 20 to nail It so that when the nail is withdrawn it bular structure of elastic rubber composition, -_
and a layer of non-elastic, sticky rubber compo
draws some of the stock II with it so as com
pletely to seal the hole through the body struc-' sition on the interior wall thereof, said sticky
rubber composition including phosphoric acid.
ture II, as shown at 22, Figure 5, and thus ef
2. An inner tube comprising an annular tu
fectively to prevent the escape of air from the
' inner tube. This sealing action is greatly su-’ bular structure of elastic rubber composition, and
perior to that of a puncture-sealing inner tube in a layer of non-elastic, sticky rubber composition
which an internal layer of vulcanized rubber on the interior wall thereof, said sticky rubber
covers ‘the plastic layer. In the latter instance composition including an anti-vulcanizing chem
' the vulcanized rubber, being elastic, yieldingiy ical agent causing a permanent softening of the
grips the nail that punctures it, with the result rubber when subjected to heat.
that it follows the nail as the latter is withdrawn
3. An inner tube comprising ‘an annular tu
from the hole, and thus prevents the plastic com
position from ?lling the hole. The thin film of
relatively non-tacky material coated on the in
terior of the tube as described above is relatively
bular structure of elastic rubber composition,
and a' circumferential coating of non-elastic,
sticky composition on the interior thereof, said
non-elastic and does not follow the ‘nail so as
been subjected to heat in the presence of a vul
sticky composition comprising rubber that has
to interfere with the e?ective sealing puncture. canization retarder.
4. An inner tube comprising an annular tubu
The layer ll retains its sticky character for
an indefinite period and provides a positive seal lar structure of elastic rubber composition, a
40 against puncture of the tube. \The tube is less layer of rubber composition on the interior wall‘
costly, lighter in weight, and provides easier'rid thereof, which composition is permanently soft
ing than puncture-sealing tubes of the compres
and sticky, and a thin, non-tacky non-elastic
sion type. The tube may be manufactured with plastic ?lm covering said sticky layer so that the
inner surfacepf the latter is free to adhere to
but slight departure from the usual tube-man
ufacturing methods, and the invention achieves a puncturing instrument for sealing a puncture .
the other advantages set out in the foregoing in said tube as said instrument is withdrawn
statement of objects.
In addition to ortho-phosphoric acid it has
been found that many other chemical agents
also have the power to cause the rubber to be
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