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US3678022A
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Polymerizing unsaturated monomers with a catalyst of an iron complex, a dialkyl aluminum compound and a bidentate ligand
Assignee: Covestro International SA
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Filing: 1970-07-09
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Granted: 1972-07-18
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Expires: 1990-07-09
Abstract
Abstract Process for polymerizing olefins, diolefins and alkylene oxides in the presence of a catalyst system comprised of an iron complex, a trialkyl aluminum compound and a bidentate ligand capable of both p i ( pi and sigma ( sigma ) banding to form a five or six-membered ring.
Inventors
- 👤 John E Bozik
- 👤 Harold E Swift
- 👤 Ching Yong Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:02
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12; C08F; C08F10/00; C08F36/00; C08F36/02; C08F36/04; C08F4/00; C08F4/06; C08F4/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
24 words
Polymerization process as defined in claim 1 wherein the molar ratio of trialkyl aluminum to iron complex varies from about 1/1 to about 4/1.
Claim 2
Dependent Claim
24 words
Polymerization process as defined in claim 1 wherein the molar ratio of bidentate ligand to iron complex varies from about 0.1/1 to about 2.5/1.
Claim 3
Dependent Claim
23 words
Polymerization process as defined in claim 1 wherein the molar ratio of monomer to iron complex varies from about 100/1 to about 400/1.
Claim 4
Dependent Claim
21 words
Polymerization process as defined in claim 1 wherein the polymerization is conducted at temperatures ranging from about -50*C. to about 150*C.
Claim 5
Dependent Claim
20 words
Polymerization process as defined in claim 1 wherein the polymerization is conducted in the presence of an inert organic solvent.
Claim 6
Dependent Claim
16 words
Polymerization process as defined in claim 6 wherein the solvent is an inert aromatic hydrocarbon solvent.
Claim 7
Dependent Claim
21 words
Polymerization process as definEd in claim 1 wherein the catalyst system comprises (i) iron acetylacetonate, (ii) trialkyl aluminum, and (iii) 2-cyanopyridine.
Claim 8
Dependent Claim
15 words
Polymerization process as defined in claim 8 wherein phenyl-2-pyridylacetonitrile is employed in lieu of 2-cyanopyridine.
References Cited (Backward Citations)
US3565875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |