Appeal No. 2001-0968
Application No. 08/894,423
present invention is said to be capable of producing polyolefins
in the form of "free-flowing particles having a tamped bulk
density higher than 0.5 g/cm3." (Specification, page 3.)
Further, the resulting polyolefins are said to contain "a
particularly small fraction" of particles having a diameter of
500 Fm or smaller. (Id.) Further details of this appealed
subject matter are recited in illustrative claim 1 reproduced
below: 1. Solid catalyst component for the
polymerization of olefins, comprising the product of
the direct reaction, with no subsequent reactions with
reducing organometallic compounds, between a titanium
compound containing at least one Ti-halogen bond,
optionally an electron-donor compound, and a support
obtained by contacting a metal oxide containing
hydroxyl groups with a solution comprising:
A) magnesium chloride;
B) an alcohol in quantities ranging from 1 to 6
moles per mole of magnesium chloride,
in an organic solvent C) which is either a
halogenated hydrocarbon or an aromatic hydrocarbon, the
organic solvent being capable of bringing the magnesium
chloride in solution in quantities greater than or
equal to 5 g per liter in the presence of the above
mentioned quantities of alcohol B), said solvent not
being able to form adducts with magnesium chloride.
The examiner relies on the following prior art references as
evidence of unpatentability:
Zucchini et al. 4,305,840 Dec. 15, 1981
(Zucchini '840)
Zucchini et al. 5,219,961 Jun. 15, 1993
(Zucchini '961)
Banzi et al. 5,578,540 Nov. 26, 1996
(Banzi) (effective filing date Nov. 28, 1994)
Werner et al. 0 274 099 A2 Jul. 13, 1988
(Werner)(published
European patent publication)
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