Appeal No. 1999-1833 2
Application No. 08/480,728
THE INVENTION
The invention is directed to a process for the polymerization of olefins wherein the
catalyst is contacted with a lithium compound selected from the group consisting of lithium
cyclopentadienide and lithium indene. Additional limitations are forth in the following
illustrative claim.
THE CLAIMS
Claims 18, 19 and 33 are illustrative of appellants’ invention and are reproduced
below.
18. A process for the polymerization of olefins comprising:
a) selecting a conventional supported Ziegler-Natta transition metal
compound catalyst component wherein the transition metal
compound is of the general formula MR+x where M is the metal, R is
a halogen or a hydrocarboxyl and x is the valence of the metal;
b) contacting the catalyst component with a lithium compound
chosen from the group consisting of lithium cyclopentadienide and
lithium indene;
c) forming a catalyst by contacting the catalyst component/lithium
compound mixture with an aluminum trialkyl co-catalyst described by
the formula A1R’3 where R’ is an alkyl of from 1-8 carbon atoms and
R’ may be the same or different; and
d) contacting the catalyst with an external electron donor either
simultaneously with or after step (b), said external electron donor
having the general formula SiRm (OR’)4-m, where R is selected from
the group consisting of an alkyl group, a cycloalkyl group, an aryl
group and a vinyl group; R’ is an alkyl group; and m is 0-3, wherein
when R is an alkyl group, R may be identical with R’; when m is 0, 1
or 2, the R’ groups may be identical or different; and when m is 1, 2
or 3, the R groups may be identical or different; and
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