Appeal 2007-3668
Application 11/031,587
contacting the catalyst with olefin monomer to form a
prepolymerized catalyst, wherein the Ziegler-Natta type catalyst is
made using a level of magnesium precursor, the magnesium precursor
chosen from the group consisting of dibutylmagnesium and
butylethylmagnesium and wherein the level of magnesium precursor
is adapted to produce a polymer having a percentage of polymer fines
of less than 0.5%.
10. A process for modifying a Ziegler-Natta type catalyst
comprising:
providing a Ziegler-Natta type catalyst; and
contacting the catalyst with olefin monomer to form a
prepolymerized catalyst, wherein the Ziegler-Natta type catalyst is
formed using an organoaluminum compound, wherein the
organoaluminum compound comprises triisobutylaluminum and
wherein the prepolymerized catalyst is capable of producing a
polymer having a percentage of polymer fines that is reduced when
compared to prepolymerized catalysts prepared with organoaluminum
compounds other than triisobutylaluminum.
Appellants’ claimed invention is directed to a process for modifying a
Ziegler-Natta type catalyst. The polymer resulting from polymerization with
the claimed catalyst is described as having a percentage of polymer fines of
less than 0.5% (claim 6); and having a percentage of polymer fines that is
reduced when compared to prepolymerized catalysts prepared with
organoaluminum compounds other than triisobutylaluminum (claim 10).
Appealed claims 2, 3, and 5-10 stand rejected under 35 U.S.C. § 112,
first paragraph, as containing subject matter which was not described in the
original Specification in such a way as to reasonably convey that Appellants
were in possession of the invention now claimed at the time of filing. This
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