US3840511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diene polymerisation
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1972-02-18
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Granted: 1974-10-08
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Expires: 1992-02-18
Abstract
Abstract 1. A PROCESS FOR THE POLYMERISATION OF A CONJUGATED DIENE TO PRODUCE A POLYMER HAVING A PREDOMINANT PROPORTION OF CIS 1,4 POLY(DIENE) WHICH COMPRISES CONTACTING THE CONJUGATED DIENE UNDER MOISTURE- AND OXYGEN-FREE CONDITIONS WUITH A TRANSITION METAL COMPOSITION WHICH IS THE PRODUCT OF REACTING A TITANIUM COMPLEX OF GENERAL FORMULA R4TI WITH ALUMINA WHICH IS FREE FROM ADSORBED WATER, WHEREIN R IS A HYDROCARBON GROUP OR SUBSTITUTED HYDROCARBON GROUP OF FORMULA -CH2Y WHERE Y IS A PHENYL OR NAPHTHYL GROUP, OR A GROUP OF FORMULA Z(R'')3 WHERE Z IS SILICON AND EACH R'' IS A HYDROCARBON GROUP OR HYDROGEN.
Inventors
- 👤 D Ballard
- 👤 E Jones
- 👤 A Pioli
- 👤 P Robinson
- 👤 R Wyatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:39
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR THE POLYMERISATION OF A CONJUGATED DIENE TO PRODUCE A POLYMER HAVING A PREDOMINANT PROPORTION OF CIS 1,4 POLY(DIENE) WHICH COMPRISES CONTACTING THE CONJUGATED DIENE UNDER MOISTURE- AND OXYGEN-FREE CONDITIONS WUITH A TRANSITION METAL COMPOSITION WHICH IS THE PRODUCT OF REACTING A TITANIUM COMPLEX OF GENERAL FORMULA R4TI WITH ALUMINA WHICH IS FREE FROM ADSORBED WATER, WHEREIN R IS A HYDROCARBON GROUP OR SUBSTITUTED HYDROCARBON GROUP OF FORMULA -CH2Y WHERE Y IS A PHENYL OR NAPHTHYL GROUP, OR A GROUP OF FORMULA Z(R'')3 WHERE Z IS SILICON AND EACH R'' IS A HYDROCARBON GROUP OR HYDROGEN.
Claim 2
Dependent Claim
98 words
A PROCESS FOR THE POLYMERISATION OF A CONJUGATED DIENE TO PRODUCE A POLYMER HAVING A PREDOMINANT PROPORTION OF CIS 1,4 POLY(DIENE) WHICH COMPRISES CONTACTING THE CONJUGATED DIENE UNDER MOISTURE- AND OXYGEN-FREE CONDITIONS WUITH A TRANSITION METAL COMPOSITION WHICH IS THE PRODUCT OF REACTING A TITANIUM COMPLEX OF GENERAL FORMULA R4TI WITH ALUMINA WHICH IS FREE FROM ADSORBED WATER, WHEREIN R IS A HYDROCARBON GROUP OR SUBSTITUTED HYDROCARBON GROUP OF FORMULA -CH2Y WHERE Y IS A PHENYL OR NAPHTHYL GROUP, OR A GROUP OF FORMULA Z(R'')3 WHERE Z IS SILICON AND EACH R'' IS A HYDROCARBON GROUP OR HYDROGEN.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |