US3595850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of polybutadienes having improved tear strength
Assignee: Ube Corp
•
Filing: 1969-06-26
•
Granted: 1971-07-27
•
Expires: 1989-06-26
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF POLYBUTADIENE, WHICH COMPRISES POLYMERISING BUTADIENE IN AN INERT ORGANIC SOLVENT IN THE PRESENCE OF A TRANS-1,4-POLYMERISATION CATALYST OF AN AMOUNT SUCH THAT A TRANS-1,4-STRUCTURE ACCOUNTS FOR 3-30% OF THE FINAL POLYBUTADIENE, ADDING A CIS-1,4-POLYMERISATION CATALYST TO THIS POLYMERISATION SYSTEM, AND POLYMERISING THE BUTADIENE FURTHER IN THIS SYSTEM, THE TRANS1,4-POLYMERISATION AND CIS-1,4-POLYMERISATION TIMES BEING ADJUSTED SO THAT THE FINAL POLYBUTADIENE HAS A TRANS-1,4STRUCTURE OF 3-30% AND A CIS-1,4-STRUCTURE OF AT LEAST 70%.
Inventors
- 👤 Motowo Takayanagi
- 👤 Shotaro Sugiura
- 👤 Teturo Matuura
- 👤 Haruo Ueno
- 👤 Fumio Tasaka
- 👤 Minoru Kono
- 👤 Keiichi Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:49
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |