Claims
- 1. A process for polymerizing olefin(s) in the presence of a catalyst system comprising a mixture of two or more hafnium transition metal metallocene catalyst compounds, wherein each hafnocene has at least one ligand substituted with at least one linear or iso alkyl group having 3 or more carbon atoms, and an activator.
- 2. The process in accordance with claim 1 wherein the substituent is selected from one or more of the group consisting of n-propyl, isopropyl, n-butyl, isobutyl and n-pentyl.
- 3. The process in accordance with claim 1 wherein the process is a gas phase process.
- 4. The process in accordance with claim 1 wherein the hafnium transition metal metallocene catalyst compound is bis(n-propyl-cyclopentadienyl) hafnium dichloride.
- 5. A continuous gas phase process for polymerizing olefin(s) in a fluidized bed gas phase reactor in the presence of a catalyst system to produce a polymer product, the catalyst system comprising an activator and a mixture of two or more hafnium transition metal metallocene catalyst compounds, wherein each hafnocene has at least one liquid substituted with at least one linesr or iso alkyl group having 3 or more carbon atoms, and the polymer product comprises less than 5 ppm hafnium.
- 6. The process of claim 5 wherein the polymer product comprises less than 1 ppm hafnium.
- 7. The process in accordance with claim 5 wherein the substituent is an alkyl having 3 to 10 carbon atoms.
- 8. The process in accordance with claim 5 wherein the metallocene is represented by the formula:(C5H5−d−fR″d)eR′″fHfQg−e wherein (C5H5−d−fR″d) is an unsubstituted or substituted cyclopentadienyl ligand bonded to Hf, wherein at least one (C5H5−d−fR″d) is substituted with at least one R″ which is a linear or iso alkyl substituent having 3 or more carbon atoms, each additional R″, which can be the same or different is hydrogen or a substituted or unsubstituted hydrocarbyl having from 1 to 30 carbon atoms or combinations thereof or two or more carbon atoms are joined together to form a part of a substituted or unsubstituted ring or ring system having 4 to 30 carbon atoms, R′″ is one or more or a combination of the group consisting of carbon, germanium, silicon, phosphorous and nitrogen atoms containing radical bridging two (C5H5−d−fR″d) rings, or bridging one (C5H5−d−fR″d) ring to Hf; each Q which can be the same or different is selected from the group consisting of a hydride, substituted and unsubstituted hydrocarbyl having from 1 to 30 carbon atoms, halogen, alkoxides, aryloxides, amides, phosphides and combination thereof; two Q's together form an alkylidene ligand or cyclometallated hydrocarbyl ligand or other divalent anionic chelating ligand; where g is an integer corresponding to the formal oxidation state of Hf, d is 0, 1, 2, 3, 4 or 5, f is 0 and e is 1, 2 or 3, and the polymer product has a melt index less than 0.1 dg/min without the addition of hydrogen to the process.
- 9. A continuous slurry phase process for polymerizing olefin(s) in the presence of a catalyst system to produce a polymer product in a liquid polymerzation medium, the catalyst system comprising an activator and a mixture of two or more hafnium transition metal metallocene catalyst compounds, wherein each hafnocene has at least one ligand substituted with at least one linear or iso alkyl group having 3 or more carbon atoms, and polymer product comprises less than 2 ppm hafnium.
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a continuation-in-part application of U.S. patent application Ser. No. 08/986,696 filed Dec. 8, 1997.
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
08/986696 |
Dec 1997 |
US |
Child |
09/207213 |
|
US |