Appeal 2007-2136
Application 10/457,769
a) forming a reaction mixture at a sufficient temperature
to allow formation of the polyolefin resin by combining
molecular hydrogen, a first olefin selected from the group
consisting of ethylene and a C3-C8 α-olefin, an optional diluent,
a second olefin selected from the group consisting of ethylene
and a C3-C8 α-olefin, an optional diluent, and a catalyst system
that forms long chain branches on a polymer backbone, wherein
the first olefin is different than the second olefin;
b) optionally removing one or more of the first olefin, the
second olefin, molecular hydrogen, and the diluent; and
c) introducing additional amounts of molecular hydrogen,
the first olefin, and optionally, the second olefin and the diluent,
wherein additional polymerization occurs in step c and
the polyolefin resin has a density greater than about 0.92, a melt
index from about 0.01 to about 20, and a long chain branching
index of about 1 to about 6.
Thus, claim 14 is directed to a method of forming a polyolefin resin
comprising combining molecular hydrogen, an olefin, a diluent, and a
vanadium-containing catalyst system that includes a modifier of formula I to
form a reaction mixture and initiating polymerization of the reaction
mixture, the modifier being added “at any point during the formation of the
polyolefin resin.” Claim 14 also requires that the resulting polyolefin resin
has a particular density, melt index, and long chain branching index. We
interpret claim 14 to require that modifier be added after the formation of
polyolefin is begun.
Claim 28 is directed to a method of forming a polyolefin resin
comprising combining molecular hydrogen, two different olefins, and “a
catalyst system that forms long chain branches on a polymer backbone” to
form a reaction mixture “at a sufficient temperature to allow formation of
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