US3075959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifying polyolefins
Assignee: Hoechst AG
•
Filing: 1958-05-20
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Granted: 1963-01-29
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Expires: 1978-05-20
Abstract
No abstract record available.
Inventors
- 👤 Wagener Siegfried
- 👤 Kreuter Herbert
- 👤 Sonnmer Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:51
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
IN A PROCESS FOR RECOVERING SOLID POLYOLEFINS OBTAINED IN A HYDROCARBON DISPERSING MEDIUM BY POLYMERIZING AN OLEFIN SELECTED FROM THE GROUP CONSISTING OF ETHYLENE, PROPYLENE, AND BUTYLENE WITH A CATALYST SYSTEM CONSISTING OF AN ORGANO-ALUMINUM COMPOUND AND A TITANIUM CHLORIDE, THE IMPROVEMENT WHICH COMPRISES TREATING THE HYDROCARBON SUSPENSION OF THE POLYOLEFIN WITH A MIXTURE OF 0.1-5% BY VOLUME OF DISPERSING MEDIUM OF AN ALCOHOL OF 3 TO 8 CARBON ATOMS AND 0.01-1% BY WEIGHT OF SAID POLYMER OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL HYDROXIDE AND AN ALKALI METAL SALT OF AN ORGANIC ACID, AND THEN SEPARATING THE PURIFIED POLYMER FROM THE DISPERSING MEDIUM, THE AMOUNT OF ALCOHOL AND ALKALI COMPOUNDS BEING SUFFICIENT TO FORM A SOLUTION OF THE ALKALI IN THE HYDROCARBON DISPERANT.
Claim 2
Dependent Claim
131 words
IN A PROCESS FOR RECOVERING SOLID POLYOLEFINS OBTAINED IN A HYDROCARBON DISPERSING MEDIUM BY POLYMERIZING AN OLEFIN SELECTED FROM THE GROUP CONSISTING OF ETHYLENE, PROPYLENE, AND BUTYLENE WITH A CATALYST SYSTEM CONSISTING OF AN ORGANO-ALUMINUM COMPOUND AND A TITANIUM CHLORIDE, THE IMPROVEMENT WHICH COMPRISES TREATING THE HYDROCARBON SUSPENSION OF THE POLYOLEFIN WITH A MIXTURE OF 0.1-5% BY VOLUME OF DISPERSING MEDIUM OF AN ALCOHOL OF 3 TO 8 CARBON ATOMS AND 0.01-1% BY WEIGHT OF SAID POLYMER OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL HYDROXIDE AND AN ALKALI METAL SALT OF AN ORGANIC ACID, AND THEN SEPARATING THE PURIFIED POLYMER FROM THE DISPERSING MEDIUM, THE AMOUNT OF ALCOHOL AND ALKALI COMPOUNDS BEING SUFFICIENT TO FORM A SOLUTION OF THE ALKALI IN THE HYDROCARBON DISPERANT.
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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) | 1966-01-28 | 1966-07-30 | 1967-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-28 | 1970-07-30 | 1971-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-28 | 1974-07-30 | 1975-01-29 | $7700.00 | Window Closed / Lapsed |