US3287343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of polyolefins
Assignee: Hercules LLC
•
Filing: 1963-12-10
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Granted: 1966-11-22
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Expires: 1983-12-10
Abstract
No abstract record available.
Inventors
- 👤 Kutner Abraham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:40
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN THE PROCESS FOR REMOVING CATALYST RESIDUES FROM A POLYOLEFIN WHICH HAS BEEN OBTAINED BY POLYMERIZING AN OLEFIN IN THE PRESENCE OF A CATALYST COMPRISING A COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF THE METALS OF GROUPS IV-B AND V-B OF THE PERIODIC TABLE IN COMBINATION WITH AN ORGANOMETALLIC COMPOUND OF A METAL OF GROUP III-A OF THE PERIODIC TABLE IN THE PRESENCE OF AN INERT LIQUID DILUENT WHEREIN THE SLURRY OF SOLID POLYMER IN DILUENT THAT IS OBTAINED FROM THE POLYMERIZATION IS TREATED WITH AN ALKANOL TO SOLUBILIZE THE CATALYST RESIDUES, FOLLOWING WHICH THE POLYMER IS SEPARATED FROM THE SLURRY AND WASHED WITH AN INERT LIQUID HYDROCARBON, THE IMPROVEMENT WHICH COMPRISES ADDING TO THE ALKANOL-TREATED SLURRY PRIOR TO SEPARATION OF THE POLYMER AN ALKANOIC ACID HAVING FROM 3 TO ABOUT 22 CARBON ATOMS IN THE AMOUNT OF ABOUT 0.5 TO ABOUT 1.5 MOLES PER MOLS OF TOTAL METAL IN THE SLURRY TO RENDER THE SLURRY INSENSITIVE TO AIR AND MOISTURE.
Claim 2
Dependent Claim
164 words
IN THE PROCESS FOR REMOVING CATALYST RESIDUES FROM A POLYOLEFIN WHICH HAS BEEN OBTAINED BY POLYMERIZING AN OLEFIN IN THE PRESENCE OF A CATALYST COMPRISING A COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF THE METALS OF GROUPS IV-B AND V-B OF THE PERIODIC TABLE IN COMBINATION WITH AN ORGANOMETALLIC COMPOUND OF A METAL OF GROUP III-A OF THE PERIODIC TABLE IN THE PRESENCE OF AN INERT LIQUID DILUENT WHEREIN THE SLURRY OF SOLID POLYMER IN DILUENT THAT IS OBTAINED FROM THE POLYMERIZATION IS TREATED WITH AN ALKANOL TO SOLUBILIZE THE CATALYST RESIDUES, FOLLOWING WHICH THE POLYMER IS SEPARATED FROM THE SLURRY AND WASHED WITH AN INERT LIQUID HYDROCARBON, THE IMPROVEMENT WHICH COMPRISES ADDING TO THE ALKANOL-TREATED SLURRY PRIOR TO SEPARATION OF THE POLYMER AN ALKANOIC ACID HAVING FROM 3 TO ABOUT 22 CARBON ATOMS IN THE AMOUNT OF ABOUT 0.5 TO ABOUT 1.5 MOLES PER MOLS OF TOTAL METAL IN THE SLURRY TO RENDER THE SLURRY INSENSITIVE TO AIR AND MOISTURE.
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |