US3732335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of block polymers
Assignee: Solvay SA
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Filing: 1971-05-26
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Granted: 1973-05-08
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Expires: 1991-05-26
Abstract
Abstract POLYPROPYLENE MODIFIED BY A RANDOM COPOLYMER OF PROPYLENE AND A SECOND A-OLEFIN IS PREPARED BY A TWOSTAGE PROCESS. IN THE FIRST STAGE, PROPYLENE IS POLYMERIZEDD IN THE PRESENCE OF VIOLET TICL3 AND DIALKYLALUMINUM MONOCHLORICE UNTIL POLYPROPYLENE IN AN AMOUNT OF ABOUT 80 TO 99% BY WEIGHT OF THE TOTAL QUANTITY OF POLYMER TO BE PREPARED HAS BEEN FORMED. A SECOND A-OLEFIN AND A SECOND ACTIVATOR CONSTITUTED BY TRIALKYLALUMINUM IS THEN ADDED TO THE SYSTEM AND IN A SECOND STAGE, THE POLYMERIZATION IS CONTINUED, PROPYLENE BEING POLYMERIZED WITH THE SECOND A-OLEFIN TO FORM A RANDOM COPOLYMER IN AN AMOUNT OF 1 TO 20% BY WEIGHT OF THE TOTAL QUANTITY OF POLYMER TO BE PREPARED.
Inventors
- 👤 J Hermans
- 👤 E Leblon
- 👤 Jeune M Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:21
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |