Appeal 2007-2136
Application 10/457,769
BACKGROUND
The Specification describes
a method of forming a polyolefin resin . . . compris[ing]
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 C3-C8 α-olefin, an optional second olefin which is
different than the first olefin selected from the group consisting
of ethylene and C3-C8 α-olefin, a diluent, and a catalyst system
that forms long chain branches on a polymer backbone and
initiating polymerization of the reaction mixture. The resulting
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 greater than about 1.
(Specification 3.) The Specification states that this method “can be
separated into two discrete parts” (id. at 9).
The Specification also describes a vanadium-containing catalyst
system for use in this method, which includes an organoaluminum
compound cocatalyst, “a promoter which improves the activity of the
catalyst while also possibly modifying the molecular weight distribution,”
and optionally “a modifier having formula I:
(R1O)xSiR24-x I
where R1 and R2 are each independently alkyl and x is 1 to 3” (id. at 8). The
Specification indicates that the “modifier is useful in tailor[ing] the
molecular weight distribution and long chain branching of the polyolefin[]
resins” and “is added at any point during the formation of the polyolefin
resin” (id.).
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Last modified: September 9, 2013