Appeal No. 1997-2378
Application No. 08/233,533
polyhedron-shaped polypropylene particles, and claim 27 is
directed to polypropylene particles produced using polyhedron-
shaped MgCl support particles. Claims 25 and 27 read as
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follows:
25. Polypropylene consisting essentially of particles
having a breadth of granulometric distribution expressed as
D90 lower
D10
than 15, wherein said particles have the form of essentially
regular polyhedrons with six or eight faces in which the
paired symmetrically opposite faces are essentially parallel,
two of which faces are large and elongated and form the top
face and the bottom face of a polyhedron and have the form of
a hexagon or of a lozenge such that on each of them the
longest diagonal (D) is larger than the shortest distance (d)
separating two opposite sides, which large elongated faces are
surrounded essentially perpendicularly by the other
essentially rectangular faces that form the sides of the said
polyhedron wherein the ratio D/d of the majority of particles
is between 2 and 7.
27. A polypropylene powder consisting essentially of
particles having a breadth of granulometric distribution
expressed as D90 lower than 15 and obtained by the
polymerization
D10
of propylene reproducing in a homothetic manner the shape of
the particles of the support in the presence of a catalyst
system consisting essentially of (1) particles of an MgC12
support impregnated by a halogenated titanium, vanadium,
zirconium, or hafnium compound, wherein said particles have
the form of essentially regular polyhedrons with six or eight
faces in which the paired symmetrically opposite faces are
essentially parallel, two of which faces are large and
elongated and form the top face and the bottom face of a
polyhedron such that on each of them the longest diagonal (D)
is larger than the shortest distance (d) separating two
opposite sides, which large elongated faces are surrounded
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