Appeal No. 1997-1684
Application No. 08/223,916
The claims on appeal are directed to a process for the
polymerization of propylene involving a conventional Ziegler-
Natta catalyst which is contacted with an organoaluminum
compound and at least two electron donors.
Claim 13, the sole independent claim, is illustrative of
the claimed process:2
13. A process for the polymerization of propylene,
comprising:
(a) selecting a conventional Ziegler-Natta catalyst and
(b) contacting the catalyst with an organoaluminum
compound;
(c) contacting the catalyst with a mixture of at least
two electron donors, simultaneously with or after step (b),
one described by the formula:
OR2
š
R __ ____ ____Si R
1 4
š
OR3
wherein R and R are both an alkyl or cycloalkyl group1 4
containing a secondary or tertiary carbon atom attached to the
silicon atom, R and R being the same; R and R are alkyl or1 4 2 3
aryl groups, R and R being the same or different;2 3
2Claim 13 defines two distinct electron donor categories,
each by a different chemical formula. We shall refer to the
first category as "ED1" and the second category as "ED2".
2
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