Appeal No. 2001-1852
Application No. 09/172,544
Williams discloses a heterophasic propylene polymer which
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can be used for extrusion coating (col. 4, lines 3-6 and 16-53).
The examiner relies throughout the answer on Williams’ example 7,
which is the only example of a heterophasic polymer. In this
example eight samples of a heterophasic propylene polymer having
a melt flow rate (MFR) of 3.6 dg/min are irradiated under eight
sets of conditions to increase the MFR. The sample relied upon
by the examiner has an MFR of 28.6 dg/min (table 6) which, the
examiner argues, is very close to the 30 dg/min recited in the
appellant’s claim 1 (answer, page 8). The heterophasic propylene
polymer in Williams’ example 7 contains 15 wt% ethylene/propylene
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rubber (i.e., F is 15 wt%) and 60% ethylene units (i.e., E isc c
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50 wt%). The polydispersity indexes of the eight samples are
2.46 to 2.71 (table 6), all of which are within the Q value range
of less than 6.5 recited in the appellant’s claim 1.
“Heterophasic propylene polymer” used by Williams and “propylene impact
copolymer” used by the appellant have the same meaning (brief, page 5,
footnote 1).
Williams’ disclosed F range is 1-45 wt%, preferably 8-25 wt%, mostc
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