Patent US4649128A successfully refreshed from Google Patents.
US4649128A
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Deactivator for olefin polymerization catalyst
Assignee: Equistar Chemicals LP
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Filing: 1985-11-21
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Granted: 1987-03-10
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Expires: 2005-11-21
Abstract
Abstract A method is disclosed for controlling the activity of or deactivating a transition element olefin polymerization catalyst by contacting the catalyst with a deactivating polymer comprising a homopolymer of an unsaturated polar organic compound or a copolymer of an alpha-olefin and an unsaturated polar organic compound.
Inventors
- 👤 Louis J. Rekers
- 👤 Anthony N. Speca
- 👤 Harry W. Mayhew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:35
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
A method comprising deactivating an olefin polymerization catalyst selected from the group consisting of Ziegler-Natta transition element catalysts and catalysts based on transition metal oxides by contacting said cataylst with a copolymer consisting of an alpha-olefin having from 2 to about 12 carbon atoms and an unsaturated ester of a carboxylic acid, said deactivating copolymer present in an amount such that the molar ratio of the unsaturated ester thereof to the sum of the transistion element component of the polymerization catalyst and a cocatalyst for said transistion element catalyst is in the range of between about 0.1 and about 6.
Claim 2
Independent Claim
100 words
A method comprising deactivating an olefin polymerization catalyst selected from the group consisting of Ziegler-Natta transition element catalysts and catalysts based on transition metal oxides by contacting said cataylst with a copolymer consisting of an alpha-olefin having from 2 to about 12 carbon atoms and an unsaturated ester of a carboxylic acid, said deactivating copolymer present in an amount such that the molar ratio of the unsaturated ester thereof to the sum of the transistion element component of the polymerization catalyst and a cocatalyst for said transistion element catalyst is in the range of between about 0.1 and about 6.
Claim 3
Dependent Claim
24 words
The method of claim 1 where said unsaturated ester is selected from a member of the group consisting of vinyl esters and acrylic esters.
Claim 4
Dependent Claim
16 words
The method of claim 2 where said alpha-olefin contains from 2 to about 4 carbon atoms.
Claim 5
Dependent Claim
13 words
The method of claim 3 where said unsaturated ester comprises a vinyl ester.
Claim 6
Dependent Claim
10 words
The method of claim 4 where said alpha-olefin comprises ethylene.
Claim 7
Dependent Claim
12 words
The method of claim 5 where said vinyl ester comprises vinyl acetate.
Claim 8
Dependent Claim
24 words
The method of claim 1 where said deactivating copolymer comrpises from about 5 mole % to about 60 mole % of said unsaturated ester.
Claim 9
Dependent Claim
31 words
The method of claim 1 where said catalyst comprises a Ziegler-Natta catalyst based on a transition element selected from a member of the group consisting of Ti, V, Cr and Zr.
Claim 10
Dependent Claim
29 words
The method of claim 1 where said catalyst comprises an oxide of a transition element selected from a member of the group consisting of V, Cr, Mo and W.
Claim 11
Dependent Claim
13 words
The method of claim 8 where said unsaturated ester comprises a vinyl ester.
Claim 12
Dependent Claim
12 words
The method of claim 10 where said vinyl ester comprises vinyl acetate.
Claim 13
Dependent Claim
11 words
The method of claim 11 where said transition element comprises Ti.
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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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |