Interference 103,482
the hemiisotactic polypropylene produced by polymerizing
propylene at 65 C. in Example IV of Ewen, U.S. PatentO
5,036,034 (Appendix F), using methylaluminoxane and iPr(3MeCp-
1-Flu)ZrCl in methylene chloride as the catalyst, which
2
hemiisotactic polypropylene is characterized by the pentad
composition of
Table II from its C-13 NMR spectra, with the syndio-isoblock
polypropylenes Dolle produced by polymerizing propylene at
O O O O O
70 C., 60 C., 50 C., 40 C. and 10 C. in his Examples 8-12
(Dolle Application 08/147,006, spec., pp. 17-20), using
methylaluminoxane and iPr(3MeCp-1-Flu or 2MeCp-1-Flu)ZrCl in2 4
toluene as the catalyst, which also are characterized by
pentad compositions from C-13 NMR spectra presented at the end
of each example of Dolle Application 08/147,006. Ewen states
(Ewen,
U.S. Patent 5,036,034, col. 9, l. 23-32; emphasis added):
This invention has taken a known syndiospecific
catalyst precursor with bi-lateral symmetry and added a
methyl group on one of the cyclopentadienyl groups to
eliminate the bi-lateral symmetry. The new catalyst
4 Dolle describes the synthesis of iPr(3MeCp-1-Flu)ZrCl2
in Example 2 (Application 08/147,006, spec., p. 8, l. 19-23).
Accordingly, Dolle’s reference to iPr(2MeCp-1-Flu)ZrCl for
2
Examples 8-12 (Dolle Application 08/147,006, spec., p. 17,
l. 24-26) may be incorrect. The formulas iPr(3MeCp-1-Flu)ZrCl
2
and iPr(3MeCp-9-Flu)ZrCl define the same compound.
2
50
Page: Previous 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 Next
Last modified: November 3, 2007