Claims
- 1. A process for polymerizing propylene, said process comprising:a) selecting a metallocene compound described by the formula: R″(CpRn)(CpR′m)MeHal2 wherein R″(CpRn)(CpR′m) is an isopropylidene (3-methylcyclopentadienyl-1-fluorenyl) radical; Me is a Group IVb, Vb, or VIb metal; each Hal is a halogen; b) activating the metallocene compound as a metallocene catalyst with methylaluminoxane; c) polymerizing propylene with the metallocene catalyst; d) forming hemiisotactic polypropylene; e) selecting a second metallocene compound described by the formula: R″(CpRn)(CpR′m)MeHal2 wherein R″(CpRn)(CpR′m) is an isopropylidene (cyclopentadienyl-1-fluorenyl) radical; Me is a Group IVb, Vb, or VIb metal; each Hal is a halogen; and f) forming a reactor blend of hemiisotactic polypropylene and syndiotactic polypropylene.
- 2. A process for polymerizing propylene, said process comprising:a) selecting a metallocene compound described by the formula: R″(CpRn)(CpR′m)MeHal2 wherein R″(CpRn)(CpR′m) is an isopropylidene (3-methylcyclopentadienyl-1-fluorenyl) radical; Me is a Group IVb, Vb, or VIb metal; each Hal is a halogen; b) activating the metallocene compound as a metallocene catalyst with methylaluminoxane; c) polymerizing propylene with the metallocene catalyst; d) forming hemiisotactic polypropylene; e) selecting a second metallocene compound described by the formula: R″(CpRn)(CpR′m)MeHal2 wherein R″(CpRn)(CpR′m) is an ethylenebis(tetrahydroindenyl) radical; Me is a Group IVb, Vb, or VIb metal; each Hal is a halogen; and f) forming reactor blend of hemiisotactic polypropylene and isotactic polypropylene.
Parent Case Info
This is a Continuation application of copending application Ser. No. 07/695,139, filed on May 3, 1991, now abandoned, which is a Division of application Ser. No. 07/419,221, filed on Oct. 10, 1989, now issued as U.S. Pat. No. 5,036,034.
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Continuations (1)
|
Number |
Date |
Country |
Parent |
07/695139 |
May 1991 |
US |
Child |
08/663469 |
|
US |