Claims
- 1. A method of preparing polypropylene comprising polymerizing propylene monomer within a reaction zone in the presence of a di- or polyether internal donor-containing Ziegler-Natta catalyst system and hydrogen from about 0.3 to about 1.1 mol % of monomer feed, to yield a propylene polymer having a melt flow of at least about 300 g/10 min and a xylene solubles of not more than about 3.5% by weight.
- 2. The method of claim 1, wherein the propylene polymer has a xylene solubles of from about 1% to 3.5% by weight.
- 3. The method of claim 1, wherein the reaction zone is a bulk phase polymerization reaction zone.
- 4. The method of claim 1, wherein the reaction zone is a gas phase polymerization reaction zone.
- 5. The method of claim 1, wherein the reaction zone is a slurry polymerization reaction zone.
- 6. The method of claim 1, wherein the catalyst system also contains an external donor present in an amount of from 0.01 to about 10 ppm by weight of monomer.
- 7. The method of claim 6, wherein the external donor is present in an amount of from 0.01 to about 1 ppm by weight of monomer.
- 8. The method of claim 6, wherein the external donor is present in an amount of from 0.01 to about 0.5 ppm by weight of monomer.
- 9. The method of claim 1, wherein the Ziegler-Natta catalyst system further includes an internal phthalate donor.
Parent Case Info
This application claims the benefit of U.S. Provisional Application No. 60/261,705, filed Jan. 12, 2001.
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Provisional Applications (1)
|
Number |
Date |
Country |
|
60/261705 |
Jan 2001 |
US |