US5194532A
Expired / Lapsed
US
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Homogeneous catalysts and olefin polymerization process
Assignee: Dow Chemical Co
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Filing: 1992-06-12
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Granted: 1993-03-16
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Expires: 2012-06-12
Abstract
Abstract Olefins are polymerized in the presence of a homogeneous catalyst represented by the formula LTi(NR 2 ) 3 wherein L is a π-bonded ligand selected from the group consisting of indenyl, C 1 -C 4 alkyl substituted indenyl, --OSiR 3 substituted indenyl, R is a C 1 -C 4 alkyl group wherein each R attached to the same nitrogen atom is the same, but the R groups attached to different nitrogen atoms can be the same or different from those attached to the other nitrogen atoms.
Inventors
- 👤 John G. Hefner
- 👤 Brian W. S. Kolthammer
- 👤 Dennis R. Gifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:09
CPC Classifications
C; C08; C08F; C08F10/00; C07; C07F; C07F17/00; C07F7/00; C07F7/28; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/6592; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A process for polymerizing one or more monomers comprising one or more α-olefins or one or more α-olefins and one or more polymerizable ethylenically unsaturated monomers which process comprises subjecting said monomers to polymerization in the presence of a homogeneous catalyst compound represented by the formula LTi(NR 1 2 ) 3 wherein L is a π-bonded ligand selected from the group consisting of indenyl, C 1 -C 4 alkyl substituted indenyl, --OSiR 3 substituted indenyl; and each R 1 group attached to the same nitrogen atom is the same, however, the R 1 groups attached to different nitrogen atoms can be the same or different from those attached to other nitrogen atoms and are C 1 -C 4 alkyl groups.
Claim 2
Dependent Claim
120 words
A process for polymerizing one or more monomers comprising one or more α-olefins or one or more α-olefins and one or more polymerizable ethylenically unsaturated monomers which process comprises subjecting said monomers to polymerization in the presence of a homogeneous catalyst compound represented by the formula LTi(NR 1 2 ) 3 wherein L is a π-bonded ligand selected from the group consisting of indenyl, C 1 -C 4 alkyl substituted indenyl, --OSiR 3 substituted indenyl; and each R 1 group attached to the same nitrogen atom is the same, however, the R 1 groups attached to different nitrogen atoms can be the same or different from those attached to other nitrogen atoms and are C 1 -C 4 alkyl groups.
Claim 3
Dependent Claim
22 words
A process of claim 1 wherein L is an indenyl group , and each R 1 is independently methyl, ethyl or n-propyl.
Claim 4
Dependent Claim
28 words
A process of claim 1 wherein ethylene or a mixture of ethylene and one or more α-olefins having from about 3 to about 10 carbon atoms are polymerized.
Claim 5
Dependent Claim
29 words
A process of claim 3 wherein ethylene or a mixture of ethylene and at least one of propylene, butene-1, 4-methylpentene-1, hexene-1 or octene-1 are polymerized under solution polymerization conditions.
Claim 6
Dependent Claim
28 words
A process of claim 2 wherein ethylene or a mixture of ethylene and one or more α-olefins having from about 3 to about 10 carbon atoms are polymerized.
Claim 7
Dependent Claim
29 words
A process of claim 5 wherein ethylene or a mixture of ethylene and at least one of propylene, butene-1, 4-methylpentene-1, hexene-1 or octene-1 are polymerized under solution polymerization conditions.
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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) | 1996-03-15 | 1996-09-14 | 1997-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-15 | 2000-09-14 | 2001-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-15 | 2004-09-14 | 2005-03-16 | $7700.00 | Window Closed / Lapsed |