Appeal No. 1997-3908
Application 08/174,997
herein, refers to the external electron donor or selectivity
control agent (SCA)” (page 13, lines 9-10). Thus, we
interpret “electron donor” in appellants’ claims as meaning an
external electron donor.
Consequently, the examiner’s argument that appellants’
electron donor is an internal electron donor (answer, page 8)
is not well taken. The examiner argues that because the
electron donor is added in step (c) in claim 1 in the
preparation of the catalyst system, it is an internal electron
donor. See id. This electron donor, however, is not used in
the preparation of the Ziegler-Natta catalyst but, rather, as
indicated by step (d) of that claim, is added with the
organoaluminum co-catalyst to the Ziegler-Natta/metallocene
catalyst mixture.
The examiner argues that appellants’ electron donor is
the same type of component as the electron donor in Fujita’s
example 5 (answer, page 8). In Fujita’s example 5, the
synthesis of solid catalyst component (A), which is the
Ziegler-Natta/metallocene component, is carried out according
to the method of example 2, wherein an electron donor is used
5
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