US5442019A
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Process for transitioning between incompatible polymerization catalysts
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1994-03-25
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Granted: 1995-08-15
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Expires: 2014-03-25
Abstract
Abstract This invention relates to a process for transitioning between incompatible polymerization catalyst systems. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to a metallocene-olefin polymerization reaction.
Inventors
- 👤 Agapios K. Agapiou
- 👤 Michael E. Muhle
- 👤 Gary T. Renola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:46
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; C08F2/00; C08F2/38; C08F2/40; C08F210/00; C08F210/16; C08F2410/00; C08F2410/05; Y; Y10; Y10S; Y10S526/00; Y10S526/901
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
A process for transitioning from a polymerization reaction catalyzed by a first catalyst to one catalyzed by a second catalyst comprising a metallocene catalyst wherein said first and second catalysts are incompatible, said process comprising the steps of: a) discontinuing the introduction of the first catalyst into a reactor; b) introducing into the reactor an irreversible catalyst killer in an amount greater than about 1 molar equivalent based on the total gram atom metal of the first catalyst in the reactor; and c) introducing the second catalyst into the reactor.
Claim 2
Dependent Claim
90 words
A process for transitioning from a polymerization reaction catalyzed by a first catalyst to one catalyzed by a second catalyst comprising a metallocene catalyst wherein said first and second catalysts are incompatible, said process comprising the steps of: a) discontinuing the introduction of the first catalyst into a reactor; b) introducing into the reactor an irreversible catalyst killer in an amount greater than about 1 molar equivalent based on the total gram atom metal of the first catalyst in the reactor; and c) introducing the second catalyst into the reactor.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the first catalyst comprises a traditional Ziegler-Natta catalyst.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein the amount of irreversible catalyst killer is greater than about 2 molar equivalent based on the total gram atom metal of the first catalyst in the reactor.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the irreversible catalyst killer is water.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the process further comprises introducing a reversible catalyst killer.
Claim 7
Dependent Claim
32 words
The process of claim 5 wherein the amount of reversible catalyst killer is greater than 2 molar equivalent based on the total gram atom metal of the first catalyst in the reactor.
Claim 8
Dependent Claim
24 words
The process of claim 6 wherein the reversible catalyst killer is at least one of the group consisting of CO and CO 2 .
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein the process further comprises introducing an organometallic compound prior to step (c).
Claim 10
Dependent Claim
18 words
The process of claim 8 wherein the process further comprises rendering the first catalyst substantially incapable of polymerization.
Claim 11
Dependent Claim
88 words
A process for transitioning from a polymerization reaction catalyzed by a first catalyst to one catalyzed by a second catalyst comprises a metallocene catalyst wherein said first and second catalysts are incompatible, said process comprising the steps of: a) discontinuing the introduction of the first catalyst into a reactor; b) rendering the first catalyst substantially incapable of polymerization; c) introducing into the reactor an irreversible catalyst killer in an amount sufficient to inactivate substantially all of said first catalyst; and d) introducing the second catalyst into the reactor.
Claim 12
Dependent Claim
88 words
A process for transitioning from a polymerization reaction catalyzed by a first catalyst to one catalyzed by a second catalyst comprises a metallocene catalyst wherein said first and second catalysts are incompatible, said process comprising the steps of: a) discontinuing the introduction of the first catalyst into a reactor; b) rendering the first catalyst substantially incapable of polymerization; c) introducing into the reactor an irreversible catalyst killer in an amount sufficient to inactivate substantially all of said first catalyst; and d) introducing the second catalyst into the reactor.
Claim 13
Dependent Claim
14 words
The process of claim 10 wherein the first catalyst comprises a traditional Ziegler-Natta catalyst.
Claim 14
Dependent Claim
33 words
The process of claim 10 wherein the amount of irreversible catalyst killer is greater than about 2 molar equivalent based on the total gram atom metal of the first catalyst in the reactor.
Claim 15
Dependent Claim
23 words
The process of claim 10 wherein said first catalyst is rendered substantially incapable of polymerization by the introduction of a reversible catalyst killer.
Claim 16
Dependent Claim
32 words
The process of claim 13 wherein the amount of reversible catalyst killer is greater than 2 molar equivalent based on the total gram atom metal of the first catalyst in the reactor.
Claim 17
Dependent Claim
22 words
The process of claim 10 wherein the process further comprises the step of removing impurities from the reactor prior to step (d).
References Cited (Backward Citations)
US4460755A
Cited
US4883847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-14 | 1999-02-13 | 1999-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-14 | 2003-02-13 | 2003-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-14 | 2007-02-13 | 2007-08-15 | $7700.00 | Window Closed / Lapsed |