Patent US5544257A successfully refreshed from Google Patents.
Patent US3626719A successfully refreshed from Google Patents.
US3884889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic triene coupling agents
Assignee: Phillips Petroleum Co
•
Filing: 1973-06-01
•
Granted: 1975-05-20
•
Expires: 1993-06-01
Abstract
Abstract Cyclic trienes are utilized as coupling agents for polymers which are prepared employing an organolithium initiator.
Inventors
- 👤 Henry L Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:40
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
IN A PROCESS FOR THE PRODUCTION OF RUBBERY CONJUGATED DIENE POLYMERS HAVING A TENDENCY TO COLD FLOW BY POLYMERIZING A CONJUGATED DIENE HAVING FROM 4 TO 12 CARBON ATOMS PER MOLECULE IN THE PRESENCE OF A HYDROCARBON LITHIUM INITATOR, THE IMPROVEMENT FOR INCREASING THE MOONEY VISCOSITY, INHER ENT VISCOSITY, MOLECULAR WEIGHT VALUES, PROCESSABILITY, AS WELL AS REDUCING COLD FLOW OS SUCH POLYMERS WHICH IMPROVEMENT COMPRISES CARRYING OUT SAID POLYMERIZING IN THE PRESENCE OF A 1,3,5-CYCLOHEPTATRIENE COUPLING AGENT HAVING THE FORMULA
Claim 2
Dependent Claim
80 words
IN A PROCESS FOR THE PRODUCTION OF RUBBERY CONJUGATED DIENE POLYMERS HAVING A TENDENCY TO COLD FLOW BY POLYMERIZING A CONJUGATED DIENE HAVING FROM 4 TO 12 CARBON ATOMS PER MOLECULE IN THE PRESENCE OF A HYDROCARBON LITHIUM INITATOR, THE IMPROVEMENT FOR INCREASING THE MOONEY VISCOSITY, INHER ENT VISCOSITY, MOLECULAR WEIGHT VALUES, PROCESSABILITY, AS WELL AS REDUCING COLD FLOW OS SUCH POLYMERS WHICH IMPROVEMENT COMPRISES CARRYING OUT SAID POLYMERIZING IN THE PRESENCE OF A 1,3,5-CYCLOHEPTATRIENE COUPLING AGENT HAVING THE FORMULA
Claim 3
Dependent Claim
30 words
A process according to claim 1 wherein said coupling agent is utilized in an amount ranging from about 0.1 to about 10 parts by weight per hundred parts of monomer.
Claim 4
Dependent Claim
18 words
A process according to claim 1 wherein said conjugated diene is butadiene and said coupling agent is 1,3,5-cycloheptatriene.
Claim 5
Dependent Claim
24 words
A process according to claim 1 wherein said conjugated diene polymer is a copolymer of butadiene and styrene and said coupling agent is 1,3,5-cycloheptatriene.
Claim 6
Dependent Claim
26 words
A process according to claim 1 for reducing the tendency of polybutadiene to cold flow which comprises polymerizing butadiene in the presence of butyllithium and 1,3,5-cycloheptatriene.
Claim 7
Dependent Claim
30 words
A process according to claim 1 for reducing the tendency of a butadiene-styrene copolymer to cold flow which comprises polymerizing butadiene and styrene in the presence of butyllithium and 1,3,5-cycloheptatriene.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |