Appeal No. 2001-1852
Application No. 09/172,544
Williams does not disclose the intrinsic viscosity ratio of
his heterophasic propylene polymer. The appellant states
(specification, page 3) that the intrinsic viscosity ratio ($/")
may be calculated from:
($/") = 1 + (1/fc)[(MF homopolymer/MF copolymer)0.213- 1.0]
where fc is the fraction of rubbery copolymer in the impact
copolymer.
Williams does not disclose the melt flow rate of the
propylene homopolymer in his example 7. However, the propylene
homopolymer in Williams’ example 8, which was obtained from the
same source as the heterophasic propylene polymer in example 7,
has an MFR of 20 dg/min. Substituting this value of MF
homopolymer along with MF copolymer = 30 and fc = 0.15 into the
above equation gives an intrinsic viscosity ratio of
0.448 dg/min, which is well below the 1.1 dg/min lower limit
recited in the appellant’s claim 1.
The examiner argues that the propylene homopolymer in
Williams’ example 8 is irradiated and then peroxide-visbroken to
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