Appeal No. 1999-2506
Application No. 08/545,254
Based upon the above findings we conclude that Hasegawa discloses each of the
limitations of the claimed subject matter other than a disclosure of a diaylsilanediyl bridging
moiety, Hasegawa being directed to a dialkylsilanediyl bridging moiety.
Palackal is relied upon by the examiner to disclose the equivalency of the dialkyl and
diarylsilanediyl bridging moiety in the metallocene formula I of Hasegawa. See Answer, page
4. We find that Palackal similar to Hasegawa is directed to the polymerization of olefins
using metallocene catalysts. See page 2, lines 6-8. We find that the metallocene catalysts of
Palackal have a bridging moiety as required by the claimed subject matter and directed to a
diorgansilyl bridge. See page 2, lines 6-9, and page 3, lines 1-4 and 26-48. We find that
the bridging moiety designated as R’ is preferably selected from the group consisting of alkyl
radicals having 1 to 6 carbon atoms and aryl carbon radicals having 6 to 10 carbon atoms.
See page 4, lines 9-11. We find that the preferred metals in the catalyst include titanium,
zirconium and hafnium as required by the claimed subject matter. See page 5, lines 20-21.
We further find that the most preferred cocatalyst is aluminoxane. See page 5, lines 16-33.
In this respect, we note that aluminoxane is the compound of appellants’ claim 10. We find
that an olefin polymerization is exemplified by a metallocene catalyst containing either a
dialkylsilanediyl bridging moiety as disclosed by Hasegawa or a diarylsilanediyl moiety. See
Example V and Table I. We find that the polymerization temperature of the example is
70oC. Palackal however, disclose polymerization temperatures of -60oC to about
6
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