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US5648439A
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Process for producing polyolefins
Assignee: Phillips Petroleum Co
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Filing: 1995-07-14
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Granted: 1997-07-15
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Expires: 2015-07-14
Abstract
Abstract A process is provided to produce polyolefins having a multimodal molecular weight distribution at the molecular level by contacting at least one mono-1-olefin in a polymerization zone, under polymerization conditions, with two different types of supported chromium catalyst systems. The first catalyst system comprises a chromium oxide catalyst system which comprises chromium oxide supported on an inorganic oxide. The second catalyst system comprises a chromocene catalyst system which comprises chromocene supported on an inorganic oxide. The resultant, recovered polymer has a multimodal, or at least a bimodal, molecular weight distribution.
Inventors
- 👤 Joseph J. Bergmeister
- 👤 Scott E. Kufeld
- 👤 Max P. McDaniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:55
CPC Classifications
C; C08; C08F; C08F10/00; C08F210/00; C08F210/16; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/639; C08F4/63912; C08F4/63916; C08F4/6392; C08F4/63922; C08F4/63925
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
65 words
A process of producing polyolefins having a multimodal molecular weight distribution comprising polymerizing under polymerization conditions in a polymerization zone at least one olefin in the presence of a dual catalyst system comprising: a) a chromocene catalyst system comprising chromocene supported on an aluminophosphate support; and b) a chromium oxide catalyst system comprising chromium oxide supported on an inorganic oxide support; and recovering a polymer.
Claim 2
Dependent Claim
65 words
A process of producing polyolefins having a multimodal molecular weight distribution comprising polymerizing under polymerization conditions in a polymerization zone at least one olefin in the presence of a dual catalyst system comprising: a) a chromocene catalyst system comprising chromocene supported on an aluminophosphate support; and b) a chromium oxide catalyst system comprising chromium oxide supported on an inorganic oxide support; and recovering a polymer.
Claim 3
Dependent Claim
12 words
A process according to claim 1 further comprising a metal alkyl cocatalyst.
Claim 4
Dependent Claim
25 words
A process according to claim 1 wherein said olefin is selected from the group consisting of ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and mixtures thereof.
Claim 5
Dependent Claim
11 words
A process according to claim 3 wherein said olefin is ethylene.
Claim 6
Dependent Claim
37 words
A process according to claim 1 wherein said olefin includes ethylene and from about 0.5 to about 20 mole percent of a monomer selected from the group consisting of propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and mixtures thereof.
Claim 7
Dependent Claim
15 words
A process according to claim 1 wherein said polymerization conditions comprise slurry phase polymerization conditions.
Claim 8
Dependent Claim
49 words
A process according to claim 3 wherein said slurry phase polymerization conditions comprise a temperature within a range of about 80° to about 110° C. and a pressure of about 250 to about 700 psia, for a time within a range of about 1 minute to about 6 hours.
Claim 9
Dependent Claim
14 words
A process according to claim 1 wherein said chromocene is a bis-(cyclopentadienyl) chromium(II) compound.
Claim 10
Dependent Claim
30 words
A process according to claim 1 wherein said chromocene catalyst system aluminophosphate support has a phosphorus to aluminum molar ratio of within a range of about 0.2 to about 1.0.
Claim 11
Dependent Claim
26 words
A process according to claim 2 wherein said organometal cocatalyst is selected from the group consisting of alkyl boron compounds, alkyl aluminum compounds, and mixtures thereof.
Claim 12
Dependent Claim
15 words
A process according to claim 10 wherein said organometal cocatalyst is an alkyl boron compound.
Claim 13
Dependent Claim
15 words
A process according to claim 10 wherein said organometal cocatalyst is an alkyl aluminum compound.
Claim 14
Dependent Claim
67 words
A process for producing polyolefins having a multimodal molecular weight distribution consisting essentially of polymerizing under polymerization conditions in a polymerization zone at least one olefin in the presence of a dual catalyst system comprising: a) a chromocene catalyst system comprising chromocene supported on an aluminophosphate support; and b) a chromium oxide catalyst system comprising chromium oxide supported on an inorganic oxide support; and recovering of polymer.
Claim 15
Dependent Claim
67 words
A process for producing polyolefins having a multimodal molecular weight distribution consisting essentially of polymerizing under polymerization conditions in a polymerization zone at least one olefin in the presence of a dual catalyst system comprising: a) a chromocene catalyst system comprising chromocene supported on an aluminophosphate support; and b) a chromium oxide catalyst system comprising chromium oxide supported on an inorganic oxide support; and recovering of polymer.
Claim 16
Dependent Claim
12 words
A process according to claim 13 further comprising a metal alkyl cocatalyst.
Claim 17
Dependent Claim
25 words
A process according to claim 13 wherein said olefin is selected from the group consisting of ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and mixtures thereof.
Claim 18
Dependent Claim
11 words
A process according to claim 15 wherein said olefin is ethylene.
Claim 19
Dependent Claim
37 words
A process according to claim 13 wherein said olefin includes ethylene and from about 0.5 to about 20 mole percent of a monomer selected from the group consisting of propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and mixtures thereof.
Claim 20
Dependent Claim
15 words
A process according to claim 13 wherein said polymerization conditions comprise slurry phase polymerization conditions.
Claim 21
Dependent Claim
49 words
A process according to claim 15 wherein said slurry phase polymerization conditions comprise a temperature within a range of about 80° to about 110° C. and a pressure of about 250 to about 700 psia, for a time within a range of about 1 minute to about 6 hours.
Claim 22
Dependent Claim
14 words
A process according to claim 13 wherein said chromocene is a bis-(cyclopentadienyl) chromium(II) compound.
Claim 23
Dependent Claim
32 words
A process according to claim 13 wherein said chromocene catalyst system aluminophosphate support has a phosphorus to aluminum molar ratio of about 0.4 within a range of about 0.2 to about 1.0.
Claim 24
Dependent Claim
26 words
A process according to claim 14 wherein said organometal cocatalyst is selected from the group consisting of alkyl boron compounds, alkyl aluminum compounds, and mixtures thereof.
Claim 25
Dependent Claim
15 words
A process according to claim 22 wherein said organometal cocatalyst is an alkyl boron compound.
Claim 26
Dependent Claim
15 words
A process according to claim 22 wherein said organometal cocatalyst is an alkyl aluminum compound.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-07-14 | 2001-01-13 | 2001-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-14 | 2005-01-13 | 2005-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-14 | 2009-01-13 | 2009-07-15 | $7700.00 | Window Closed / Lapsed |