Appeal No. 2002-0681
Application No. 09/353,207
APPEALED SUBJECT MATTER
Claim 7 is representative of the subject matter on appeal
and reads as follows:
7. A process comprising contacting ethylene or
ethylene and one or more comonomers in one or more
fluidized bed reactors, under polymerization
conditions, with a catalyst system comprising (i) a
supported or unsupported magnesium/titanium based
precursor in slurry form, said precursor containing an
electron donor; and (ii) an activator containing
aluminum in an amount sufficient to essentially
complete the activation of the precursor, the method
comprising:
A) mixing the precursor and the activator prior
to introduction into the reactor in at least
one mixing procedure to prepare a partially
activated precursor;
B) continuously mixing the partially activated
precursor with the remainder of the activator
to essentially complete the activation of the
precursor and to prepare an essentially
completely activated precursor;
C) maintaining the mixture from (A) in slurry
form; and
D) introducing the mixture from (B) into the
reactor with the following provisos:
(i) the atomic ratio of aluminum to titanium is in the
range of about 1:1 to about 15:1, and the mole ratio of
activator to electron donor is about 1:1 to about 2:1;
(ii) the activator is one compound or a mixture of two
different compounds;
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