Ethylene interpolymer polymerizations
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United States of America Patent
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May 20, 2003
Issued Date -
N/A
app pub date -
Sep 18, 1997
filing date -
Dec 30, 1991
priority date (Note) -
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Abstract
A new process of interpolymerizing ethylene interpolymer products having improved properties, such as increased onset of crystallization temperature, is disclosed. Preferably, the process comprises interpolymerizing a first homogeneous ethylene/alpha-olefin interpolymer and at least one second homogeneous ethylene/alpha-olefin interpolymer using at least two constrained geometry catalysts having different reactivities such that the first ethylene/alpha-olefin interpolymer has a narrow molecular weight distribution (NMWD) with a very high comonomer content and relatively high molecular weight and the second ethylene/alpha-olefin interpolymer has a NMWD with a low comonomer content and a molecular weight lower than that of the first interpolymer. The resultant first homogeneous interpolymer is combined with the resultant second homogeneous interpolymer in appropriate weight ratios resulting in the desired finished polymer structure. The first interpolymer and the second interpolymer can be polymerized in a single reactor or they can be polymerized in separate reactors operated in parallel or series.
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International Classification(s)
- 1997 Application Filing Year
- C08F Class
- 1416 Applications Filed
- 688 Patents Issued To-Date
- 48.59 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 199 Citation Count
- C08F Class
- 98.58 % this patent is cited more than
- 22 Age