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Патент USA US2405343

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Patented Aug. 6, 1946
2,405,343
UNITED STATES PATENT
OFFICE -
2,405,343
RUBBER HYDROCHLORIDE COMPOSITIONS
James P. Chittum and George E. Hulse, Passaic,
N. J., assignors to United States Rubber Com
pany, New York, N. Y., a corporation of New
Jersey
No Drawing. Application November 17, 1939,
Serial No. 305,006
6 Claims. (Cl. 260—771)
1
2
This invention relates to new compositions of
matter comprising rubber-hydrogen chloride re
hyde and ethylene polyamine in accordance with
action products, particularly to transparent ?lms
and lacquers.
An object of the invention is to provide a new
class of photochemical inhibitors for rubber hy
drochloride ?lms, particularly for transparent
the invention have been found to be more resist
ant to deterioration upon exposure to light than
?lms containing no added stabilizer.
The following table illustrates the improve
ments in aging obtained by incorporating 2% by
weight of the reaction product of an aldehyde and
rubber hydrochloride ?lms. Other objects wil1 be
an ethylene polyamine in transparent ?lms of
apparent from the following description.
rubber hydrochloride:
Hitherto the effectiveness of chemical sta 10
bilizers of rubber hydrochloride has been limited
Hts. of expo
Stabilizer'
sure until
by their lack of solubility in the ?lm, their vola
brittle
tility from the ?lm, or discoloration of the ?lm on
aging.
The present invention provides chemicals which 15
are compatible with rubber hydrochloride and
which enable the production of ?lms which are
clear and free from haze or color and which do
None _____________________________________ __
35
Butyral triethylene tetramine ________ ..
Butyral diethylene triamine _________ __
60
60
The ?lms (thickness, .001 inch) were aged in a
not discolor during light aging. The chemicals
standard Fade-Ometer at 110° F.
furthermore do not impart any odor to the ?lms 20 The reaction of aldehydes and ethylene poly
which makes their use as wrappers for food mate
rials desirable. Compared with other chemicals
previously used for the purpose the ?lms of the
amines is carried out by refluxing a mixture of one
to two mols of an aldehyde and one mol of amine
at an elevated temperature with or without the
use of a small amount of an acid, organic or in
present invention retain their usefulness longer
because of better retention of strength and ?ex 26 organic. Typical examples are given by Cadwell,
ibility.
U, S. Patent 1,843,443.
Broadly the invention comprises the use, as
The new stabilizers may be used with rubber
hydrochlorides having any hydrogen chloride con
chemical stabilizers in rubber hydrochloride com
positions, of the reaction product of an aldehyde
tent in the range commercially available, and es
and an ethylene polyamine. The aldehyde may be 30 pecially with rubber hydrochloride having a hy
aliphatic for example butyraldehyde, propional
drogen chloride content of over 30% and being in
dehyde.‘
'
the form of transparent ?lm suitable for photo
The rubber hydrochloride may be produced by
graphic ?lm or for wrapping purposes.
' passing hydrogen chloride gas into a rubber ce
The rubber hydrochloride stabilized by the v
ment, as disclosed by Bradley and McGavack 00 UI chemicals disclosed herein may be used in various
(U. S. Patent 1,519,659), or by reacting rubber
forms and for the various purposes for which
with hydrogen chloride gas at a low temperature
rubber hydrochloride compositions are generally
(disclosed by Gebauer-Fullnegg and-Mo?et U. S.
known to be used.
P. 1,980,396) or by any other method.
Having thus described our invention, what We
If the rubber hydrochloride is su?iciently solu 40 claim and desire to protect by Letters Patent is:
ble it can be made into a cement to which the
1. A rubber hydrochloride composition contain
reaction product of an aldehyde and an ethylene
a small amount of the reaction product of an
polyamine is added in such amount as has been
aliphatic aldehyde and an ethylene polyamine,
determined by experiment to give effective protec
said small amount being suf?cient to stabilize the
tion against light aging. The cement may then ' rubber hydrochloride.
be cast into ?lm or used as a lacquer.
2. A rubber hydrochloride composition contain
Some products of rubber and hydrogen chloride
ing a small amount of butyral-triethylene tetra
are not su?iciently soluble to form spreading ce
mine, said small amount being su?icient to sta
ments. The reaction product of an aldehyde and
bilize the rubber hydrochloride.
an ethylene polyamine may be incorporated into 50
3. A rubber hydrochloride composition contain
such rubber hydrochlorides by milling on a rubber
ing a small amount of butyral-diethylene tri
mill. Films can then be produced by calendering
amine, said small amount being su?icient to sta
the mixture.
bilize the rubber hydrochloride.
Rubber hydrochloride ?lms having incorpo
4. A rubber hydrochloride composition contain
rated therein the product of reaction of the aide 55 ing a small amount of the reaction product of
2,405,343
4
3
an aliphatic aldehyde and a polyethylene poly
amine, said small amount being su?‘icient to sta
bilize the rubber hydrochloride.
5. A rubber hydrochloride composition contain
6. A pellicle comprising a rubber hydrochloride
composition containing a small amount of the re
action product of an aliphatic aldehyde and a
polyethylene polyamine in which the terminal
ing a small amount of the reaction product of an 5 amino groups are primary amino, said small
aliphatic aldehyde anda polyethylene polyamine
in which the terminal amino groups are primary
amino, said small amount being sufficient to sta
bilize the rubber hydrochloride.
amount being su?icient to stabilize the rubber hy
drochloride.
>
.
JAMES P. CHITTUM.
GEORGE E. HULSE,
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