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Патент USA US2129289

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_ Patented Sept. 6, 1938'
Julius 861i, Levcrkuseu-I. G. Wei-k. Germany, as
lignorto I. G. Farbeuindustrie Aktiengcaell
schalt, Fraukiort-on-the-Main, Germany
No Drawing. Application April 10, 1935, Serial
No. 15,723. In Germany April 21, 1934
OClulms. (Cl 260-1)
Thls'inventio'n has for its object the manutac
isoprenes and butadienes, can be sub
ture of new elastic compounds containing ?uorine izationtoofthe
?uorine treatment but also‘rubber
and the products and objects obtained thereby; jected
substitutes, such as white and brown factices
more particularly it relates to ?uorine containing yield,
when treated with dilute ?uorine, very ?u
‘5 rubber, synthetic rubber-like masses and substi
orine resisting tightening and insulating mate
tutes for rubber which are very valuable materials rials, particularly when mixed with ?uorine treatfor tightening and insulating electrolytic cells for ed
the production of ?uorine.
' In the production of ?uorine by electrolysis 01'
thetic rubber-like masses and substitutes for rub
1o ?uorides especially acid alkali metal ?uorides, ber
are well suited for tightening and insulating
such as potassium bi- or poly?uorides. the elec
cells vfor the production of ?uorine.
trodes and eventually also the diaphragm usually 'When constructing
an electrolytic cell for the pro
employed and the vessel for the electrolyte must duction of ?uorine, tightening and insulating
be insulated from one another. Hitherto, for this > means which are pretreated with ?uorine can be
15 purpose mineral substances, such as ?uor spar
‘have been employed. However, these substances
because of their low elasticity and their great
hardness were not very well suited as insulating
built in, but it is likewise possible to provide the
parts of the cell to be tightened or insulated with
rubber etc. which has not been treated with ?u
orine, and to effect the treatment with ?uorine by
bringing the cell into operation.
Also in that >
In accordance with the present invention rub ‘case the ?uorine is used in the diluted form since
ber, synthetic rubber-like masses and substitutes in the beginning the apparatus is ?lled with air.
for rubber have proved suitable when subjected
The new tightening and insulating material can
to a special treatment with ?uorine. This is the be applied to all known‘ ?uorine production appa
more‘ surprising since it is known that rubber and ratus. when using for instance as electrolyte
25 similar compounds react vigorously and in most
molten potassium bi?uoride the ?uorine treated
cases take ?re when brought into contact with rubber stopper insulating the anode is protected
pure ?uorine.
against super-heating by means of cooling with
‘In accordance with the invention rubber, syn
water, since in this case the electrolysis is ef
thetic rubber-like masses and substitutes for rub
at about 250° C. when using potassium
30 ber are treated with dilute ?uorine. Thereby the
poly?uorides as electrolytes cooling is only nec
rubber etc. is converted into a substitution prod
essary it higher temperatures are intended to be so_
uct containing ?uorine. This substitution prod
applied. When using, for instance, potassium
uct has the same physical characteristics as the tri?uoride or tetra?uoride, no cooling at all is
untreated product but it is resistant to the in
necessary, since the electrolysis can be performed
35 ?uence of free ?uorine also in a. concentrated
at about 70-90° C. In the electrolytic cc-lls ?u
form. The compound thus treated'with ?uorine orine treated rubber stoppers and rubber pack
is a very valuable material for tightening and ings can be applied, but also rubber plates can be
insulating electrolytic cells for the production of used
which are obtainable by vulcanization of soft
?uorine. For obtaining the ?uorine treated com
or hard rubber mixtures upon single parts of the
40 pound the ?uorine can be diluted by indi?erent
apparatus and treatment with dilute ?uorine.
gases, for instance, in the proportion 1:1. to 1:10. To avoid the hydrogen evolution occurring at the
As indi?erent gases air, nitrogen, C02 and so on bottom or the apparatus beneath the ?uorine
can be employed. The objects treated in this chamber by which a mixture of hydrogen and ?u
manner take up ?uorine on the surface and the orine may be formed, whereby explosions may
45 surface contains between about 1 to 10% of ?u
occur, the bottom is covered with a ?uorine
orine. When the reaction is carried out for a treated rubber layer. By the application of ?u- v
‘ prolonged time the object treated takes upistill orine treated rubber packings and covers it is
more ?uorine. The reaction of the ?uorine on possible to use for the production of ?uorine
' the rubber etc. can also be performed by dissolv
such apparatus as are used for the electrolysis of
50 ing the rubber in an appropriate solvent, 'suchas water, for instance, uni= or bi-polar cells or ?lter
carbon tetrachloride and introducing ?uorine into
press apparatus.
this solution. In this manner products are ob—
tained which contain up to 30% oi?v ?uorine.
1. Process of producing a ?uorine containing
Besides natural rubber. synthetic rubber-like derivative of a compound'oi’ the group consistng
g5 masses, as are obtainable for instance by polymer
of rubber, synthetic rubber-like masses and sub 65
stitutes for rubber which comprises contacting ,
stitutes tor rubber which comprises contacting
the compoundwith ?uorine diluted by an indif
ierent gas.
the compound with ?uorine diluted by nitrogen.
2. Process of producing a ?uorine containing
derivative of a compound of the group consisting
of rubber, synthetic rubber-like masses and sub
stitutes Ior rubber which comprises contacting
5. Process 0! producing a ?uorine containing
derivative 0! a compound of the group consisting
of rubber, synthetic rubber-like masses and sub
stitutes for rubber which comprises contacting
the compound with ?uorine diluted by carbon
the compound with ?uorine diluted by an indif
6. A ?uorine containing elastic‘ rubber com
ferent gas of the group consisting of air, nitro
pound selected trom the group consisting of ?u 10
’ orine containing natural rubber, synthetic rub
10 gen and carbon dioxide.
3. Process of producing a ?uorine containing ber-like masses and substitutes for rubber, said
derivative of a compound of the group consisting compound having the physical characteristics of
of rubber, synthetic rubbe -'iike masses and sub
the ?uorine-tree compound, but being resistant
stitutes for rubber which comprises contacting to the in?uence or tree ?uorine and being sub 15
15 the compound with ?uorine diluted by air.
4. Process of producing a ?uorine containing
derivative of a compound of the group consisting
stantially identical with the product of the proc
ess of claim 1. I
JULIUS sonn >
of rubber, synthetic rubber-like massesand sub
2,129',289.-Julius Siill, Leverkusen-I. G. Werk, Germany. MANUFACTURE or
New FLUORINE COMPOUNDS. Patent dated September 6, 1938. Dis
claimer ?led February 21, 1939,>by the assignee, I. G. Farben'industrie
Hereby disclaims claims 1, 4, 5, and 6 of said Letters Patent.
[O?icial Gazette March 21, 1939.]
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