US3875133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst composition useful for the diene polymerization and polymerization process using the above catalyst system
Assignee: SnamProgetti SpA
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Filing: 1972-08-03
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Granted: 1975-04-01
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Expires: 1992-08-03
Abstract
Abstract A process for the stercospecific polymerization of conjugated diene by polymerizing in the presence of a catalyst comprising a compound of a transition metal of titanium vanadium zirconium, cobolt, manganese and nickel and a polyiminic polymer.
Inventors
- 👤 Agostino Balducci
- 👤 Alessandro Beranger
- 👤 Margherita Corbellini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:58
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C07; C07F; C07F5/00; C07F5/06; C07F5/069; C08F10/00; C08F136/00; C08F136/02; C08F136/04; C08F136/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A PROCESS FOR THE STEROSPECIFIC POLYMERIZATION OF ISOPRENE WHICH COMPRISES POLYMERIZING ISOPRENE IN A HYDROCARBON REACTION MEDIUM IN THE PRESENCE OF A CATALYST SYSTEM WHICH COMPRISES A COMPOUND OF TITANIUM TETRACHLORIDE AND A CHLORINATED POLYIMINOALANE POLYMER OF THE FORMULA
Claim 2
Dependent Claim
39 words
A PROCESS FOR THE STEROSPECIFIC POLYMERIZATION OF ISOPRENE WHICH COMPRISES POLYMERIZING ISOPRENE IN A HYDROCARBON REACTION MEDIUM IN THE PRESENCE OF A CATALYST SYSTEM WHICH COMPRISES A COMPOUND OF TITANIUM TETRACHLORIDE AND A CHLORINATED POLYIMINOALANE POLYMER OF THE FORMULA
Claim 3
Dependent Claim
29 words
A process according to claim 1 in which the reaction is carried out in presence of an aromatic hydrocarbon, aliphatic hydrocarbon, cycloaliphatic hydrocarbon or a mixture of said solvents.
Claim 4
Dependent Claim
32 words
A process according to claim 1 in which the polymerization reaction is carried out at a temperature ranging from -50* to +100*C and at a pressure ranging from 1 to 50 atmospheres.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |