Claims
- 1. A catalyst system for polymerization of propylene having increased molecular weight and melting point comprising
- (a) a chiral, stereorigid metallocene catalyst described by the formula:
- R"(C.sub.5 R'.sub.m).sub.2 Me Q.sub.p
- wherein (C.sub.5 R'.sub.m) is a cyclopentadienyl or substituted cyclopentadienyl; R' is hydrogen or hydrocarbyl radical having from 1-20 carbon atoms, each R' may be the same or different; R" is a silicon hydrocarbyl radical and acts as an interannular bridge between the two (C.sub.5 R'.sub.m) rings; Q is a hydrocarbon radical chosen from the group consisting of an aryl, alkyl, alkenyl, alkylaryl and arylalkyl radical having 1-20 carbon atoms or is a halogen; Me is a group 4b, 5b, or 6b metal as designated in the Periodic Table of Elements; 0.ltoreq.m.ltoreq.4; and 0.ltoreq.p<3; and
- (b) an organoaluminum compound.
- 2. A catalyst system as in claim 1 wherein the organoaluminum compound is alumoxane represented by the formula:
- (R--Al--O).sub.n
- or
- R(R--Al--O).sub.n AlR.sub.2
- wherein R is an alkyl group with 1-5 carbons and n is an integer from 1 to 20.
- 3. A catalyst system as in claim 1 wherein Me is titanium, zirconium or hafnium.
- 4. A catalyst system as in claim 3 wherein Me is zirconium.
- 5. A catalyst system as in claim 1 wherein R" is an alkyl silyl or cycloalkyl silyl radical.
- 6. A catalyst system as in claim 5 wherein R" is dimethyl silicon.
- 7. A catalyst system as in claim 5 wherein R" is cyclopropyl silicon.
- 8. A catalyst system as in claim 1 wherein C.sub.p R'.sub.m is indenyl.
- 9. A catalyst system as in claim 1 wherein Q is a halogen and .sub.p is 2.
- 10. A catalyst system as in claim 1 wherein the metallocene catalyst is dimethylsilylbis-(indenyl)zirconium dichloride.
- 11. A catalyst system as in claim 1 wherein the metallocene catalyst is cyclopropylsilylbis-(indenyl)zirconium dichloride.
- 12. A catalyst system as in claim 9 wherein Q is chlorine.
Parent Case Info
This is a continuation of application Ser. No. 07/317,089 filed on Feb. 28, 1989, now abandoned, which is a continuation of application Ser. No. 07/256,163 filed Oct. 7, 1988, now abandoned, which is a continuation of application Ser. No. 07/034,472, filed Apr. 3, 1987, now abandoned.
US Referenced Citations (8)
Continuations (3)
|
Number |
Date |
Country |
Parent |
317089 |
Feb 1989 |
|
Parent |
256163 |
Oct 1988 |
|
Parent |
34472 |
Apr 1987 |
|