Interference No. 103,303
RONALD H. SMITH, SOFOCLEOUS and HANLON, Administrative Patent
Judges.
SOFOCLEOUS, Administrative Patent Judge.
FINAL DECISION
The subject matter of this interference relates to
crystalline copolymers of propylene and 1-butene and a process
for preparing the copolymers. The counts of this interference
are as follows:
Count 1
Crystalline copolymers of propylene and 1-butene with an
essentially syndiotactic structure, containing from 1.3 to
10 mole % of 1-butene units, having a melting point from 110E
to 140EC., a fraction soluble in xylene at 25EC. less than 10%
by weight, and a composition similar to the mixture of the
monomers present in the gas phase during preparation of said
polymer, wherein the difference between the amount of
comonomer present in the gas phase and the amount of comonomer
in said composition is between 13% to 23% less in the
composition of said copolymer;
or
a syndiotactic propylene copolymer comprising 76 to 99 mole %
of propylene and 1 to 24 mole percent of butene wherein in the
13C-NMR spectrum of said syndiotactic propylene copolymer, said
copolymer exhibits a ratio of the intensity of a peak at about
20.2 ppm to the sum of the intensities of the total peaks
attributable to methyl groups in propylene units at about 19-
22 of 0.5 or more.
Count 2
A process for the preparation of the copolymers of count 1
comprising the polymerization of gaseous mixtures of propylene
-2-
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