Appeal No. 1999-2506
Application No. 08/545,254
wherein R1 is a diarylsilanediyl group which forms a bridge between the
C5H4 group and the C4H4-mR2mC5C4HR4--nR3n group to increase steric rigidity of
said compound of the formula (1); wherein C5H4 is a cyclopentadienyl group;
C4H4-mR2mC5C4H4--nR3n is a substituted fluorenyl group; R 2 and R3 are
independently a substituent on the benzo ring moiety of the substituted
fluorenyl group, which substituent is an alkyl group, a halogenated alkyl group,
an aryl group or a halogenated aryl group; M1 is Ti, Zr or Hf; each of R4 is
independently a hydrogen atom, a hydrocarbon group, an amino group of I to
20 carbons, an oxygen-containing hydrocarbon group of 1 to 20 carbons, or
halogen; m is an integer of from 0 to 4; and n is an integer of from 0 to 4; and
(b) a compound which reacts with the metallocene compound to form
a cationic metallocene compound.
THE REFERENCES OF RECORD
As evidence of obviousness, the examiner relies upon the following references.
Matsumoto et al. (Matsumoto) 5,369,196 Nov. 29, 1994
Brekner et al. (Brekner) 5,545,829 Aug. 13, 1996
Palackal et al. (Palackal) EP 0 628 577 Dec. 14, 1994
Hasegawa et al. (Hasegawa) EP 0 612 768 Aug. 31, 1994
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