US3738944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions for initiating olefin polymerisation and the use thereof
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-03-01
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Granted: 1973-06-12
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Expires: 1991-03-01
Abstract
Abstract A TRANSITION METAL COMPOSITION USEFUL FOR POLYMERIZING OLEFINS, WHICH IS FORMED BY THE REACTION OF (1) A MATERIAL INSOLUBLE IN ORGANIC SOLVENT HAVING SURFACE HYDROXYL GROUPS FREE FROM ADSORBED WATER, (2) A TRANSITION METAL COMPOUND HAVING AT LEAST ONE HYDROCARBYL LIGAND, THE TRANSITION METAL BEING SELECTED FROM THOSE OF GROUPS IV-A AND V-A OF THE PERIODIC TABLE OF ELEMENTS, AND (3) A COMPOUND OF A METAL OF GROUPS I TO III OF THE SAID PERIODIC TABLE HAVING AT LEAST ONE HYDROCARBYL LIGAND. THE COMPOSITION IS USEFUL IN THE POLYMERISATION AND COPOLYMERISATION OF OLEFINICALLY UNSATURATED MONOMERS, ESPECIALLY ETHYLENE.
Inventors
- 👤 J Candlin
- 👤 J Maguire
- 👤 R Wyatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:01
CPC Classifications
C; C08; C08F; C08F10/00; C08F36/00; C08F36/02; C08F36/04; C08F4/00; C08F4/06; C08F4/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |