Appeal No. 1998-3182
Application No. 08/459,526
Claim 1 is illustrative:
1. A catalyst system effective in the preparation of
polyolefins having a multimodal or at least bimodal
molecular weight distribution comprising a supported
catalyst-component comprising an alumoxane and at least
two supported metallocenes each having activity
effective for olefin polymerization containing the same
transition metal and selected from the group consisting
of mono, di, and tri-cyclopentadienyls and substituted
cyclopentadienyls of a Group 4b, 5b, or 6b transition
metal wherein at least one of the metallocenes is
bridged and at least one of the metallocenes is
unbridged.
In the rejection of the appealed claims the examiner relies
upon the following reference as evidence of obviousness:
Tsutsui et al. (Tsutsui) 5,374,700 Dec. 20, 1994
Appellants’ claimed invention is directed to a catalyst
system comprising alumoxane and the recited bridged and unbridged
metallocenes on a support, such as silica. The catalyst system
is effective in preparing polyolefins having at least a bimodal
molecular weight distribution.
Appealed claims 1-6, 15, 16, 18 and 20-24 stand rejected
under 35 U.S.C. § 102(e) as anticipated by, or in the
alternative, under 35 U.S.C. § 103 as being unpatentable over
Tsutsui.
Appellants have not set forth separate arguments for
claims 2-6 and 15. Accordingly, claims 2-6 and 15 stand or
2
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