Appeal No. 1999-1832
Application No. 08/474,233
magnesium, titanium and halogen as essential ingredients, (B) an
organoaluminum compound, and (C) an organosilicon compound
containing a cyclopentyl group, a cyclopentenyl group, a
cyclopentadienyl group or a derivative derived from any of these
groups” (abstract; col. 11, lines 23-35). The especially
preferred organosilicon compounds are those wherein, in
Ishimaru’s general formula SiR21Rm22(OR23)3-m, m is 2, R21 is a
cyclopentyl group, R22 is an alkyl group or a cyclopentyl group,
and R23 is an alkyl group, particularly a methyl or ethyl group
(col. 11, lines 33-35; col. 12, lines 38-42). The exemplified
organosilicon compounds include dicyclopentyldimethoxysilane
(col. 12, lines 52-53).
Because Ishimaru teaches that polyolefins made using the
disclosed catalyst have high stereoregularity and are excellent
in particle size distribution, particle diameter and bulk density
(abstract; col. 15, lines 56-59), which are properties desired by
Mao (col. 13, lines 3-6 and 11-17), Ishimaru would have fairly
suggested, to one of ordinary skill in the art, use of his
organosilicon compound as the organosilicon compound in Mao’s
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