Patent US3440963A successfully refreshed from Google Patents.
US3573249A
Expired / Lapsed
US
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Polymerization of butadiene
Assignee: Polysar Ltd
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Filing: 1967-06-29
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Granted: 1971-03-30
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Expires: 1987-06-29
Abstract
Abstract A MIXTURE OF BUTADIENE-1,3 AND A MONO-ALKENYL AROMATIC HYDROCARBON SUCH AS STYRENE IS POLYMERIZED IN THE ABSENCE OF DILUENTS OF IN THE PRESENCE OF BUTENE-2 AS THE ONLY DILUENT USING A ZIEGLER TYPE CATALYST CONSISTING OF E.G. COBALT OCTOATE AND ALUMINUM DIETHYL CHLORIDE. A CIS- 1,4 POLYMER OF BUTADIENE SUBSTANTIALLY FREE OF HOMOPOLYMER OF STYRENE IS OBTAINED IN THE FORM OF A SOLUTION IN THE AROMATIC HYDROCARBON. THIS SOLUTION IS POLYMERIZED USING A FREE RADICAL INITIATOR TO PRODUCE AN IMPACT RESISTANT THERMOPLASTIC COMPOSITION.
Inventors
- 👤 John F Henderson
- 👤 Jules Darcy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:57
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F36/06
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |