06515086 is referenced by 39 patents and cites 9 patents.

A process for preparing polyolefins having a monomer length of up to C10, which comprises first contacting: (1) a metallocene catalyst component for the preparation of a polyolefin which comprises an isotactic polyolefin or syndiotactic/isotactic block polyolefin having a monomer length of up to C

10

, the component having the general formula:

R″(CpR

1

R

2

R

3

)(Cp′R

1

′R

2

′)MQ

2

wherein Cp is a cyclopentadienyl ring substituted with at least one substituent of R

1

R

2

and/or R

3

; Cp′ is a substituted fluorenyl ring with substituents R

1

′ and R

2

′; R″ is a structural bridge imparting stereorigidity to the component; R

1

is a substituent on the cyclopentadienyl ring which is distal to the bridge; R

2

is a substituent on the cyclopentadienyl ring which is proximal to the bridge and positioned either non-vicinal or vicinal to the distal substituent; R

3

is a substituent on the cyclopentadienyl ring which is proximal to the bridge; R

1

′ and R

2

′ are each independently substituent groups on the fluorenyl ring; M is a Group IVB transition metal or vanadium; and each Q is hydrocarbyl, and (2) an aluminum- or boron-containing co-catalyst capable of activating the catalyst component. Second, contacting the activated catalyst with at least one olefin in a reaction zone under polymerization conditions to form an isotactic polyolefin or a syndiotactic/isotactic block polyolefin.

Title
Polyolefin production
Application Number
9/506943
Publication Number
6515086 (B1)
Application Date
February 18, 2000
Publication Date
February 4, 2003
Inventor
Abbas Razavi
Mons
US
Agent
Hitt Gaines & Boisbrun
US
Assignee
Fina Research
US
IPC
C08F 4/642
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