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Патент USA US2410605

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_-=
2,41%,605
Patented Nov. 5, 1946
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STATES I we
2,410,605
INTERPOLYMERS OF :ISOBUTYLENE WITH
AN ALKYL ACETYLENE AND THEIR PREP
eaa'rrou
-
Denis William Huebner and James Edgar Fearey,
'
Norton-on-Tees, England, assignors to Hm
periai Chemical Industries Limited, a corpora
tion of Great Britain
No Drawing. Application my 1a, 1943, Serial No.
487,537. In Great Britain May 18, 1942
i5 Claims.
(Cl. 266-92)
2
E .
aluminium chloride.
,
.cess of methyl alcohol was added to the product,
whereupon the polymer formed in the reaction
was precipitated as a sticky semi-solid. / This was
It is already known that'isobutylene and other
iso-ole?nes can be polymerised to form products
of high molecular weight, by subjecting them at
temperatures below about —10° 0., to the action
of. inorganic halides such as boron ?uoride and
further washed with methanol and then dried in
an oven at about 100° C.
The product was a
somewhat tacky, rubber-like solid which resem
bled polyisobutene of low molecular weight. The
-
We have now found that interpolym'ers of iso
ole?nes such as isobutylene with alkyl acetylenes,
-.molecular weight as determined by the Staud
inger viscosity method was 3,000 and the iodine
can be produced by subjecting a mixture con-‘
taining an lso-ole?ne and one or more alkyl 10 value was 46.5 gms. iodine/100 gms. which corre- .
sponds to ‘7.3% methyl acetylene in the inter
acetylenes ‘to the action of a catalyst of the
Friedel-Crafts type, at a temperature below
—10° C.
-
polymer.
-1. A process for the production of an inter
Operating conditions similar to those known
for the polymerisation or iso-ole?nes may be em
I
' We claim:
\
15
polymer of isobutylene and methyl acetylene
which comprises subjecting a mixture contain
ing isobutylene and methyl acetylene to the‘ ac
tion of boron tri?uoride at a temperature below.
ployed. The, molecular weights of the lnterpoly
mers ‘vary with the'reaction conditions such as
_ temperature, presence or absence of solvent,
.
amount and nature of the catalyst, in a ‘manner ' —10° C.
similar to that already known for the polymeriza 20 2. A process for the production or an inter
polymer of isobutylene and methyl acetylene
tion of iso-ole?ns per se. In addition the molec
which‘comprises subjecting a mixture containing
ular weight and yield have been found to fall as
isobutylene and methyl acetylene to the action
' the proportion of the iso-ole?ne in the inter-poly
of ' aluminium chloride at a temperature below
mer'decreases, other operating conditions being
the same.
-
25 —10° C.
.
3. A process for the production ‘of an inter
Example
A mixture consisting of 2 parts by volume of _
liquid methyl acetylene, 18 parts isobutene, —60v
polymer of isobutylene and methyl acetylene
which comprises subjecting a. mixture containing
isobutylene and methyl acetylene to the action
parts pure petroleum ether, was placed'in a 30 of a Friedel-Crafts catalyst at a temperature be
stirred glass vessel cooled to about _—80° C., in a
low ¢-10° C.
.
~.
,
'
bath of methanol and solid carbon dioxide. A
4. A process for the production of an inter
> quantity of powdered solid carbon dioxide was
polymer of_ isobutylene and methyl acetylene
which comprises subjecting a mixture containing
stirredvigorously. Su?icient solid carbon dioxide 35 isobutylene and methyl acetylene to the action of
was added so that a slight excess'remained after
a, Friedel-Cratts catalyst at a temperature not
the polymerisation. 100 parts by volume of gase
exceeding —80° C.
,.
I
ous boron tri?uoride were then rapidly passed
\5.
:The
process
according
to
claim
4
wherein
the
through the mixture whereupon vigorous poly
merisation took place, most of the solid carbon 40 FriedeLCraits catalyst is boron tri?uoride.
6. An interpolymer oi isobutylene and methyl
dioxide being vaporised by. the heat of the re
then added to the reaction mixture which was
acetylene.
action.
'
.
Throughout the reaction, the temperature re
malned at —'82° C. After polymerisation, an ex
>
'
DENISWIILIAMHUEBNE'RY,
‘J'AMES EDGAR FEAREY.
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