Appeal No. 2001-0968
Application No. 08/894,423
atoms, and (3) a silane component having the formula R1nSi(OR2)4-
n, wherein R1 is an aryl or alkyl radical having no more than 16
carbon atoms, n is 0-3, with the proviso that the atomic ratio of
Ti:Al is 1:10 to 1:800 and the molar ratio of the aluminum
component (2) to the silane component (3) is 1:0.03 to 1:0.8.
(Page 5.) The catalyst system is said to be useful for the
polymerization of propylene polymers. (Page 1.) Furthermore,
like the appellants, Werner teaches that the resulting polymers
have a reduced fraction of fine particles as well as high bulk
density. (Page 3.)
According to Werner, the titanium component (1) may be
prepared by carrying out a three sub-stage preparation process.
(Pages 5-7.) Specifically, Werner teaches a first sub-stage in
which a fine-particle magnesium chloride and 10 to 80 parts by
mole, per 10 moles of the magnesium chloride, of a C1-C8 alcohol
are continuously mixed in 1000 parts by weight, per 10 parts of
the magnesium chloride, of "a liquid, inert hydrocarbon"
(especially an alkane) at a temperature ranging from 0°C to
140°C. (Page 6.) Next, as a second sub-stage, Werner teaches
incorporating 20 to 100 parts by weight, per 10 parts by weight
of the magnesium chloride, of a particular inorganic oxide
support material having the formula SiO 2?aAl2O3, wherein a is 0-2,
4
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