Interference 103,482
“meso” triad mm has the following general configuration (Ewen
Brief, p. 3):
\ \ \
“meso” triad mm.
Isotactic polyolefins generally have a high percentage of
“meso” triads mm.
Given the above definitions and our finding that persons
skilled in the art generally would not have expected anything
other than hydrogen on either side of the polymer plane of
homopolymerized ethylene or polyethylene homopolymer, we find
that ethylene generally cannot itself be addition polymerized
to form a polymer including isotactic sequences, i.e., “meso”
dyads m. However, we find no evidence in this interference
which indicates, and Ewen has not explained why persons
skilled in the art reasonably would not have expected, that
polymers having isotactic, syndiotactic, hemiisotactic, or
syndio-isoblock sequences cannot be produced by copolymerizing
ethylene or any other olefin which is symmetrical about its
unsaturated double bond with propylene or any other 1-olefin
by conventional processes using a metallocene catalyst.
(5) Syndiotactic polyolefins
43
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