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Патент USA US2130242

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Patented Sept. 13, 1938
2,130,242“
UNITED STATES? PATENT." OFEtl-CEZ
VULOANIZATION OF- RUBBER
William~E.:Messer,- Cheshire, Conn” assignor to».~.
United . States» Rubber
Products,- ; Inc.,
New 1
York, N.. Y.; a corporation _of.Delaware
No-v Drawingr Application February: 16,‘; 1935;-v
Serial .No. (k807i
2 Claims.
This invention relates to the use of new and
improved accelerator combinations, useful in the
production of vulcanized rubber goods.
An object of this invention is to provide a new
5 activator for organic accelerators and more par
.
(01." 181-53) "
Scorch test (5 pounds per sq. in. steam pressure)
Cure in minutes
_ ticularly for thiazyl sulphide vulcanization ac
celerators such as the arylene thiazyl sulphides
and disulphides which when used in conjunction
therewith will tend to produce less scorching and
1017
795
1692
2107
817
10
10 better calendering as well as better ageing rub
ber stocks.
Unaged
‘
These activators are characterized in being
broadly amino thiophenols characterized by the
grouping
Cure in ruins. at 30 lbs. sq. in. steam
pressure
15
2820
3960
4530
l1610
20 wherein R, is hydrogen or a substituted element
or group. Examples are o-amino thiophenol,
20
o-o' diamino-diphenyl disulphide, o-o’ diamino
diphenyl monosulphide, p-amino thiophenol, p-p’
diamino-diphenyl monosulphide, m-amino thio
25 phenol,
m.m’-diamino-diphenyl
disulphide,
m.m'-diamino diphenyl monosulphide, o-p’-di
amino diphenyl disulphide, o-p’-diamino di
phenyl sulphide and halogen and/or alkyl nu
clear~substituted derivatives thereof. The salts
30 and acyl derivatives of the amino thiophenols
may also be used, as where the hydrogen of the
sulfhydryl group is replaced by metal or an acyl
group.
25
168 hrs. in oxygen bomb (300
oxygen maintained at 60° C.)
605
The following example is given to illustrate‘
35 preferred aspects of the invention and is not to
be construed as limiting thereof. The parts given
are parts by Weight. T stands for tensile in
pounds per square inch at break, and E stands
for percent elongation at break. The stock that
40 is tested for scorching properties, and tensiles
before and after ageing is a tire tread stock.
Parts
1737
1592
35
1412
It will be observed that the initial cure, as
shown by the scorch test, is retarded by use
the combination in B. Also that the optimum
cure is reached at about the same time as with
in ageing properties.
Instead of mercaptobenzothiazole, its disul
Stock
A
1567
1825
the full amount of mercaptobenzothiazole (stock
A) which shows that an economy in use of the
thiazole accelerator may be obtained by the pres
ent invention and further with an improvement 45
Example 1
45
565
452
452
385
30
B
phide, mercapto-benzo-thiazole-disulphide (di
Smoked sheets _____ _ _
50 Carbon black
Zinc oxide
Pine tar__
Sulphur _______ -_
__
Zinc soap oi cocoanut oil acids _____________ _ _
Mercaptobenzothiazole ___________________ ._
,__ _
0.00
100. 00
2.00
42.00
10. 00
3. 50
10.00
3. 50
3.25
3. 25
4. 00
4. 00
1. 25
. 30
0-0 ’-diamino diphenyl disulphide ________________________ _.
. 90
benzothiazyl disulphide) may be used, as well as
other well known thiazole accelerators which are
derivatives, substitution products or salts of mer
captobenzothiazole illustrated by dinitro phenyl
ester of mercaptobenzothiazole, benzoyl benzo
thiazyl sulphide, etc.
The amount of activator usable may vary from 55
2
2,130,242
that speci?cally shown. Generally it is usable in
amount of an activator therefor having the gen-v
the same proportions as prior art activators of
organic accelerators. The term rubber is to be
construed broadly as including caoutchouc, bal
eral formula
ata, gutta percha, rubber isomers, synthetic rubher, and is applicable to latex whether naturally
occurring or arti?cially preferred.
The activators may be used with different types
of stock than that illustrated, with other com
10 pounding ingredients and other proportions of
where R. is H or the grouping within the paren
thesis the proportion of activator being greater
than the proportion of the sulphide accelerator. 10
2. A process of producing a vulcanized rubber
ingredients. In the case of white stocks the acti
vator is substantially non-discoloring which is
product which comprises incorporating in rubber
another attribute of this invention.
prior to vulcanization a vulcanizing agent, an
arylene thiazyl sulphide accelerator and a sub
-
Having thus described my invention, what I
15 claim and desire to protect by Letters Patent is:
l. A process of producing vulcanized rubber
stantially pure diamino-diphenyl sulphide in 15
which the proportion of the diphenyl sulphide
goods which comprises accelerating the vulcani
preponderates over the proportion of the sul
zation of a vulcanizable rubber stock with an
phide accelerator.
arylene thiazyl sulphide accelerator and an added
WILLIAM E. MESSER.
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