Interference 103,482
issued, are not syndio-isoblock polymers having molecular
chains in which syndiotactic and isotactic sequences are
present and the sequence length is
3 to 50 monomer units.
Hereinabove, we defined a “hemiisotactic polyolefin”
generally as having one or more of the following
configurations:
\ \ \ \ \ \ \
\ \ \
Hemiisotactic polyolefin
wherein each \ is a radical -(CH ) -CH , where n is 0 or an
2 n 3
\
integer, which is randomly positioned on either one side of
the polymer plane or the other (Ewen Brief, p. 4; Ewen, U.S.
Patent 5,036,034, col. 1, l. 52, to col. 2, l. 22, and col. 4,
l. 15-38). Based on the above definition itself, it might
appear that persons having ordinary skill in the art prima
facie would have understood that all syndiotactic polymers are
hemiisotactic polymers, each of whose specific stereostructure
varies with the syndiospecificity of the metallocene catalyst.
To the contrary, based on all the evidence in this
interference, we find that the hemiisotactic polymers of Ewen,
U.S. Patent 5,036,034, are not generic to the syndiotactic
120
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Last modified: November 3, 2007