Appeal No. 1997-3908
Application 08/174,997
the presence of a specified catalyst system. Claim 1 is
illustrative:
1. A process for the polymerization of propylene
comprising:
a) selecting a conventional Ziegler-Natta transition
metal compound catalyst component;
b) contacting the catalyst component with a metallocene
compound of
(CpR ) (CpR’ ) M’R*
4 a 4 b v-(a+b)
where Cp is a cyclopentadienyl ring, R and R’ are substituents
on the cyclopentadienyl rings and can be a hydride or a
hydrocarbyl from 1-9 carbon atoms, each R and R’ being the
same or different, each (CpR ) and (CpR’ ) being the same or4 4
different, a and b are 0 or 1, indicating whether the
particular Cp ring is present, but at least one of a or b must
be 1; M’ is titanium or zirconium and if M’ is zirconium a is
1 and b is 0, R is a hydride, a halogen or a hydrocarbyl from*
1-20 carbon atoms, v is the valence of M’;
c) contacting an electron donor containing silicon with
an organoaluminum co-catalyst compound; wherein said electron
donor having the general formula SiR (OR’) where R is
m 4-m
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 wherein said
organoaluminum co-catalyst is described by the formula AlR*3
* *
where R is an alkyl of from 1-8 carbon atoms and R may be the
same or different;
2
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007