Appeal No. 1997-2344
Application No. 08/273,550
of > 8 dg/min. Melt flow or melt index is defined as the
viscosity of a thermoplastic polymer at a specified
temperature and pressure. Specifically, the melt index or
melt flow of a thermoplastic polymer is the number of grams of
such polymer that can be forced through a 0.0825-in. orifice
in 10 minutes at 190EC by a pressure of 2160 grams. See The
Condensed Chemical Dictionary, edited by Hawley, page 649,
copyright 1981, copy attached. Consistent with the claim
language defining the polypropylene nucleating agent as a high
melt flow material, appellants’ specification also defines
high melt flow polypropylene as meaning polypropylene having a
melt flow of from 8 dg/min. and above. See the specification
at page 4, lines 3 and 4. Although the applied Hwo reference
is silent with respect to the melt flow or melt index
parameter for the prior art polypropylene nucleating agent
(again, see Hwo at column 1, lines 44 through 46), Hwo teaches
that for a high density polyethylene nucleating material, the
melt index may range from about 0.1 to 20 with even higher
melt indexes also suitable. See column 3, lines 18 through 21
of Hwo. Significantly, Hwo further teaches that the use of a
high density polyethylene with a viscosity at mixing
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